--- loncom/interface/lonnavmaps.pm	2002/12/02 14:22:50	1.121
+++ loncom/interface/lonnavmaps.pm	2021/08/04 19:59:10	1.554
@@ -1,8 +1,7 @@
-
 # The LearningOnline Network with CAPA
 # Navigate Maps Handler
 #
-# $Id: lonnavmaps.pm,v 1.121 2002/12/02 14:22:50 bowersj2 Exp $
+# $Id: lonnavmaps.pm,v 1.554 2021/08/04 19:59:10 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -26,658 +25,545 @@
 #
 # http://www.lon-capa.org/
 #
-# (Page Handler
-#
-# (TeX Content Handler
-#
-# 05/29/00,05/30 Gerd Kortemeyer)
-# 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
-# 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
-#
-# 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
-# YEAR=2002
-# 1/1 Gerd Kortemeyer
-# Oct-Nov Jeremy Bowers
+###
 
-package Apache::lonnavmaps;
+=pod
 
-use strict;
-use Apache::Constants qw(:common :http);
-use Apache::loncommon();
-use POSIX qw (floor strftime);
+=head1 NAME
 
-sub handler {
-    my $r = shift;
-    real_handler($r);
-}
+Apache::lonnavmaps - Subroutines to handle and render the navigation
 
-sub real_handler {
-    my $r = shift;
+=head1 SYNOPSIS
 
-    &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
+Handles navigational maps.
 
-    # Handle header-only request
-    if ($r->header_only) {
-        if ($ENV{'browser.mathml'}) {
-            $r->content_type('text/xml');
-        } else {
-            $r->content_type('text/html');
-        }
-        $r->send_http_header;
-        return OK;
-    }
+The main handler generates the navigational listing for the course,
+the other objects export this information in a usable fashion for
+other modules.
+
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+
+=head1 OVERVIEW
+
+X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
+course structure and caches it in what is often referred to as the
+"big hash" X<big hash>. You can see it if you are logged into
+LON-CAPA, in a course, by going to /adm/test. The content of 
+the hash will be under the heading "Big Hash".
+
+Access to /adm/test is controlled by a domain configuration, 
+which a Domain Coordinator will set for a server's default domain
+via: Main Menu > Set domain configuration > Display (Access to 
+server status pages checked), and entering a username:domain
+or IP address in the "Show user environment" row. Users with
+an unexpired domain coordinator role in the server's domain
+automatically receive access to /adm/test.
+
+Big Hash contains, among other things, how resources are related
+to each other (next/previous), what resources are maps, which 
+resources are being chosen to not show to the student (for random
+selection), and a lot of other things that can take a lot of time
+to compute due to the amount of data that needs to be collected and
+processed.
+
+Apache::lonnavmaps provides an object model for manipulating this
+information in a higher-level fashion than directly manipulating 
+the hash. It also provides access to several auxiliary functions 
+that aren't necessarily stored in the Big Hash, but are a per-
+resource sort of value, like whether there is any feedback on 
+a given resource.
+
+Apache::lonnavmaps also abstracts away branching, and someday, 
+conditions, for the times where you don't really care about those
+things.
+
+Apache::lonnavmaps also provides fairly powerful routines for
+rendering navmaps, and last but not least, provides the navmaps
+view for when the user clicks the NAV button.
+
+B<Note>: Apache::lonnavmaps by default will show information 
+for the "currently logged in user".  However, if information
+about resources is needed for a different user, e.g., a bubblesheet
+exam which uses randomorder, or randompick needs to be printed or 
+graded for named user(s) or specific CODEs, then the username,
+domain, or CODE can be passed as arguments when creating a new 
+navmap object.
+
+Note if you want things like "due dates for another student",
+you would use the EXT function instead of lonnavmaps.
+That said, the lonnavmaps module can still help, because many
+things, such as the course structure, are usually constant
+between users, and Apache::lonnavmaps can help by providing
+symbs for the EXT call.
+
+The rest of this file will cover the provided rendering routines, 
+which can often be used without fiddling with the navmap object at
+all, then documents the Apache::lonnavmaps::navmap object, which
+is the key to accessing the Big Hash information, covers the use
+of the Iterator (which provides the logic for traversing the 
+somewhat-complicated Big Hash data structure), documents the
+Apache::lonnavmaps::Resource objects that are returned singularly
+by: getBySymb(), getById(), getByMapPc(), and getResourceByUrl()
+(can also be as an array), or in an array by retrieveResources().
+
+=head1 Subroutine: render
+
+The navmap renderer package provides a sophisticated rendering of the
+standard navigation maps interface into HTML. The provided nav map
+handler is actually just a glorified call to this.
+
+Because of the large number of parameters this function accepts,
+instead of passing it arguments as is normal, pass it in an anonymous
+hash with the desired options.
+
+The package provides a function called 'render', called as
+Apache::lonnavmaps::render({}).
+
+=head2 Overview of Columns
+
+The renderer will build an HTML table for the navmap and return
+it. The table consists of several columns, and a row for each
+resource (or possibly each part). You tell the renderer how many
+columns to create and what to place in each column, optionally using
+one or more of the prepared columns, and the renderer will assemble
+the table.
+
+Any additional generally useful column types should be placed in the
+renderer code here, so anybody can use it anywhere else. Any code
+specific to the current application (such as the addition of <input>
+elements in a column) should be placed in the code of the thing using
+the renderer.
+
+At the core of the renderer is the array reference COLS (see Example
+section below for how to pass this correctly). The COLS array will
+consist of entries of one of two types of things: Either an integer
+representing one of the pre-packaged column types, or a sub reference
+that takes a resource reference, a part number, and a reference to the
+argument hash passed to the renderer, and returns a string that will
+be inserted into the HTML representation as it.
 
-    # Send header, don't cache this page
-    if ($ENV{'browser.mathml'}) {
-        $r->content_type('text/xml');
-    } else {
-        $r->content_type('text/html');
-    }
-    &Apache::loncommon::no_cache($r);
-    $r->send_http_header;
+All other parameters are ways of either changing how the columns
+are printing, or which rows are shown.
 
-    # Create the nav map
-    my $navmap = Apache::lonnavmaps::navmap->new(
-                        $ENV{"request.course.fn"}.".db",
-                        $ENV{"request.course.fn"}."_parms.db", 1, 1);
-
-
-    if (!defined($navmap)) {
-        my $requrl = $r->uri;
-        $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
-        return HTTP_NOT_ACCEPTABLE;
-    }
-
-    $r->print("<html><head>\n");
-    $r->print("<title>Navigate Course Contents</title></head>");
-
-    # Header
-    $r->print(&Apache::loncommon::bodytag('Navigate Course Contents','',
-                                          ''));
-    $r->print('<script>window.focus();</script>');
-
-    $r->print('<table border="0" cellpadding="2" cellspacing="0">');
-    my $date=localtime;
-    $r->print('<tr><td align="right" valign="bottom">Key:&nbsp;&nbsp;</td>');
-
-    # Print discussions and feedback header
-    if ($navmap->{LAST_CHECK}) {
-        $r->print('<td align="center" valign="bottom">&nbsp;&nbsp;'.
-                  '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
-                  strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
-                  '</td><td align="center" valign="bottom">&nbsp;&nbsp;'.
-                  '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
-                  '</td>'); 
-    } else {
-        $r->print('<td align="center" valign="bottom">&nbsp;&nbsp;'.
-                  '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
-                  '&nbsp;&nbsp;<img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
-                  '</td>'); 
-    }
-    $r->print('</tr></table>');
+The pre-packaged column names are refered to by constants in the
+Apache::lonnavmaps namespace. The following currently exist:
 
-    my $condition = 0;
-    if ($ENV{'form.condition'}) {
-        $condition = 1;
-    }
+=over 4
 
-    # Determine where the "here" marker is and where the screen jumps to.
-    my $SYMB = 1; my $URL = 2; my $NOTHING = 3; # symbolic constants
-    my $hereType; # the type of marker, $SYMB, $URL, or $NOTHING
-    my $here; # the actual URL or SYMB for the here marker
-    my $jumpType; # The type of the thing we have a jump for, $SYMB or $URL
-    my $jump; # the SYMB/URL of the resource we need to jump to
+=item * B<Apache::lonnavmaps::resource>:
 
-    if ( $ENV{'form.alreadyHere'} ) { # we came from a user's manipulation of the nav page
-        # If this is a click on a folder or something, we want to preserve the "here"
-        # from the querystring, and get the new "jump" marker
-        $hereType = $ENV{'form.hereType'};
-        $here = $ENV{'form.here'};
-        $jumpType = $ENV{'form.jumpType'} || $NOTHING;
-        $jump = $ENV{'form.jump'};
-    } else { # the user is visiting the nav map from the remote
-        # We're coming from the remote. We have either a url, a symb, or nothing,
-        # and we need to figure out what.
-        # Preference: Symb
-        
-        if ($ENV{'form.symb'}) {
-            $hereType = $jumpType = $SYMB;
-            $here = $jump = $ENV{'form.symb'};
-        } elsif ($ENV{'form.postdata'}) {
-            # couldn't find a symb, is there a URL?
-            my $currenturl = $ENV{'form.postdata'};
-            $currenturl=~s/^http\:\/\///;
-            $currenturl=~s/^[^\/]+//;
+The general info about the resource: Link, icon for the type, etc. The
+first column in the standard nav map display. This column provides the
+indentation effect seen in the B<NAV> screen. This column also accepts
+the following parameters in the renderer hash:
 
-            $hereType = $jumpType = $URL;
-            $here = $jump = $currenturl;
-        } else {
-            # Nothing
-            $hereType = $jumpType = $NOTHING;
-        }
-    }
+=over 4
 
-    
-    # alreadyHere allows us to only open the maps necessary to view
-    # the current location once, while at the same time remembering
-    # the current location. Without that check, the user would never
-    # be able to close those maps; the user would close it, and the
-    # currenturl scan would re-open it.
-    my $queryAdd = "&alreadyHere=1";
+=item * B<resource_nolink>: default false
 
-    if ($condition) {
-        $r->print("<a href=\"navmaps?condition=0&filter=&$queryAdd" .
-                  "&hereType=$hereType&here=" . Apache::lonnet::escape($here) .
-                  "\">Close All Folders</a>");
-    } else {
-        $r->print("<a href=\"navmaps?condition=1&filter=&$queryAdd" .
-                  "&hereType=$hereType&here=" . Apache::lonnet::escape($here) . 
-                  "\">Open All Folders</a>");
-    }
-
-    $r->print('<br>&nbsp;');
-    $r->rflush();
-
-    # Now that we've displayed some stuff to the user, init the navmap
-    $navmap->init();
-
-    # Check that it's defined
-    if (!($navmap->courseMapDefined())) {
-        $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
-                  '</body></html>');
-        return OK;
-    }
-
-    # Grab a resource object so we have access to the constants; this
-    # is technically not proper, but should be harmless
-    my $res = $navmap->firstResource();
-
-    # These are some data tables, which make it easy to change some of
-    # of the specific visualization parameters if desired.
-
-    # Defines a status->color mapping, null string means don't color
-    my %colormap = 
-    ( $res->NETWORK_FAILURE        => '',
-      $res->CORRECT                => '',
-      $res->EXCUSED                => '#3333FF',
-      $res->PAST_DUE_ANSWER_LATER  => '',
-      $res->PAST_DUE_NO_ANSWER     => '',
-      $res->ANSWER_OPEN            => '#006600',
-      $res->OPEN_LATER             => '',
-      $res->TRIES_LEFT             => '',
-      $res->INCORRECT              => '',
-      $res->OPEN                   => '',
-      $res->NOTHING_SET            => ''        );
-    # And a special case in the nav map; what to do when the assignment
-    # is not yet done and due in less then 24 hours
-    my $hurryUpColor = "#FF0000";
-
-    # Keep these mappings in sync with lonquickgrades, which uses the colors
-    # instead of the icons.
-    my %statusIconMap = 
-        ( $res->NETWORK_FAILURE    => '',
-          $res->NOTHING_SET        => '',
-          $res->CORRECT            => 'navmap.correct.gif',
-          $res->EXCUSED            => 'navmap.correct.gif',
-          $res->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
-          $res->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
-          $res->ANSWER_OPEN        => 'navmap.wrong.gif',
-          $res->OPEN_LATER         => '',
-          $res->TRIES_LEFT         => 'navmap.open.gif',
-          $res->INCORRECT          => 'navmap.wrong.gif',
-          $res->OPEN               => 'navmap.open.gif',
-          $res->ATTEMPTED          => 'navmap.open.gif' );
-
-    my %iconAltTags = 
-        ( 'navmap.correct.gif' => 'Correct',
-          'navmap.wrong.gif'   => 'Incorrect',
-          'navmap.open.gif'    => 'Open' );
+If true, the resource will not be linked. By default, all non-folder
+resources are linked.
 
-    my %condenseStatuses =
-        ( $res->NETWORK_FAILURE    => 1,
-          $res->NOTHING_SET        => 1,
-          $res->CORRECT            => 1 );
+=item * B<resource_part_count>: default true
 
-    my %filterHash;
-    # Figure out what we're not displaying
-    foreach (split(/\,/, $ENV{"form.filter"})) {
-        if ($_) {
-            $filterHash{$_} = "1";
-        }
-    }
+If true, the resource will show a part count B<if> the full
+part list is not displayed. (See "condense_parts" later.) If false,
+the resource will never show a part count.
 
-    # Is this a new-style course? If so, we want to suppress showing the top-level
-    # maps in their own folders, in favor of "inlining" them.
-    my $topResource = $navmap->getById("0.0");
+=item * B<resource_no_folder_link>:
 
-    # Begin the HTML table
-    # four cols: resource + indent, chat+feedback, icon, text string
-    $r->print('<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n");
+If true, the resource's folder will not be clickable to open or close
+it. Default is false. True implies printCloseAll is false, since you
+can't close or open folders when this is on anyhow.
 
-    # This needs to be updated to use symbs from the remote, 
-    # instead of uris. The changes to this and the main rendering
-    # loop should be obvious.
-    # Here's a simple example of the iterator.
-    # Preprocess the map: Look for current URL, force inlined maps to display
+=item * B<map_no_edit_link>:
 
-    my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
-    my $found = 0;
-    my $depth = 1;
-    my $currentJumpIndex = 0; # keeps track of when the current resource is found,
-                             # so we can back up a few and put the anchor above the
-                             # current resource
-    my $currentJumpDelta = 2; # change this to change how many resources are displayed
-                             # before the current resource when using #current
-    $mapIterator->next(); # discard the first BEGIN_MAP
-    my $curRes = $mapIterator->next();
-    my $counter = 0;
-    my $foundJump = ($jumpType == $NOTHING); # look for jump point if we have one
-    my $looped = 0; 
+If true, the title of the folder or page will not be followed by an
+icon/link to direct editing of a folder or composite page, originally
+added via the Course Editor.
 
-    # We only need to do this if we need to open the maps to show the
-    # current position. This will change the counter so we can't count
-    # for the jump marker with this loop.
-    while ($depth > 0 && !$ENV{'form.alreadyHere'}) {
-        if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
-        if ($curRes == $mapIterator->END_MAP()) { $depth--; }
-
-        if (ref($curRes) && !$ENV{'form.alreadyHere'} && 
-            ($hereType == $SYMB && $curRes->symb() eq $here) ||
-            (ref($curRes) && $hereType == $URL && $curRes->src() eq $here)) {
-            my $mapStack = $mapIterator->getStack();
-            
-            # Ensure the parent maps are open
-            for my $map (@{$mapStack}) {
-                if ($condition) {
-                    undef $filterHash{$map->map_pc()};
-                } else {
-                    $filterHash{$map->map_pc()} = 1;
-                }
-            }
-            $ENV{'form.alreadyHere'} = 1;
-        }
-        $looped = 1;
+=back
 
-        $curRes = $mapIterator->next();
-    }            
-    
-    $mapIterator = $navmap->getIterator(undef, undef, \%filterHash, 0);
-    $depth = 1;
-    $mapIterator->next();
-    $curRes = $mapIterator->next();
+=item * B<Apache::lonnavmaps::communication_status>:
 
-    while ($depth > 0 && !$foundJump) {
-        if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
-        if ($curRes == $mapIterator->END_MAP()) { $depth--; }
-        if (ref($curRes)) { $counter++; }
+Whether there is discussion on the resource, email for the user, or
+(lumped in here) perl errors in the execution of the problem. This is
+the second column in the main nav map.
 
-        if (ref($curRes) && 
-            (($jumpType == $SYMB && $curRes->symb() eq $jump) ||
-            ($jumpType == $URL && $curRes->src() eq $jump))) {
-            # If this is the correct resource, be sure to 
-            # show it by making sure the containing maps
-            # are open.
+=item * B<Apache::lonnavmaps::quick_status>:
 
-            # This is why we have to use the main iterator instead of the
-            # potentially faster DFS: The count has to be the same, so
-            # the order has to be the same, which DFS won't give us.
-            $currentJumpIndex = $counter;
-            $foundJump = 1;
-        }
+An icon for the status of a problem, with five possible states:
+Correct, incorrect, open, awaiting grading (for a problem where the
+computer's grade is suppressed, or the computer can't grade, like
+essay problem), or none (not open yet, not a problem). The
+third column of the standard navmap.
 
-        $curRes = $mapIterator->next();
-    }
-    
-    undef $res; # so we don't accidentally use it later
-    my $indentLevel = 0;
-    my $indentString = "<img src=\"/adm/lonIcons/whitespace1.gif\" width=\"25\" height=\"1\" alt=\"\" border=\"0\" />";
+=item * B<Apache::lonnavmaps::long_status>:
 
-    my $isNewBranch = 0;
-    my $now = time();
-    my $in24Hours = $now + 24 * 60 * 60;
-    my $displayedHereMarker = 0;
-    my $displayedJumpMarker = 0;
-    
-    # We know the first thing is a BEGIN_MAP (see "$self->{STARTED}"
-    # code in iterator->next), so ignore the first one
-    $mapIterator = $navmap->getIterator(undef, undef, \%filterHash,
-                                           $condition);
-    $mapIterator->next();
-    $curRes = $mapIterator->next();
-    $depth = 1;
-
-    my @backgroundColors = ("#FFFFFF", "#F6F6F6");
-    my $rowNum = 0;
-
-    $counter = 0;
-
-    while ($depth > 0) {
-        if ($curRes == $mapIterator->BEGIN_MAP() ||
-            $curRes == $mapIterator->BEGIN_BRANCH()) {
-            $indentLevel++;
-        }
-        if ($curRes == $mapIterator->END_MAP() ||
-            $curRes == $mapIterator->END_BRANCH()) {
-            $indentLevel--;
-        }
-        if ($curRes == $mapIterator->BEGIN_BRANCH()) {
-            $isNewBranch = 1;
-        }
-        if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
-        if ($curRes == $mapIterator->END_MAP()) { $depth--; }
+A text readout of the details of the current status of the problem,
+such as "Due in 22 hours". The fourth column of the standard navmap.
 
-        if (ref($curRes)) { $counter++; }
+=item * B<Apache::lonnavmaps::part_status_summary>:
 
-        # Is this resource being ignored because it is in a random-out
-        # map and it was not selected?
-        if (ref($curRes) && !advancedUser() && $curRes->randomout()) {
-            $curRes = $mapIterator->next();
-            next; # if yes, then just ignore this resource
-        }
+A text readout summarizing the status of the problem. If it is a
+single part problem, will display "Correct", "Incorrect", 
+"Not yet open", "Open", "Attempted", or "Error". If there are
+multiple parts, this will output a string that in HTML will show a
+status of how many parts are in each status, in color coding, trying
+to match the colors of the icons within reason.
 
-        if (ref($curRes)) {
+Note this only makes sense if you are I<not> showing parts. If 
+C<showParts> is true (see below), this column will not output
+anything. 
 
-            my $deltalevel = $isNewBranch? 1 : 0; # reserves space for branch icon
+=back
 
-            if ($indentLevel - $deltalevel < 0) {
-                # If this would be at a negative depth (top-level maps in
-                # new-style courses, we want to suppress their title display)
-                # then ignore it.
-                $curRes = $mapIterator->next();
-                next;
-            }
+If you add any others please be sure to document them here.
 
-            # Step one: Decide which parts to show
-            my @parts = @{$curRes->parts()};
-            my $multipart = scalar(@parts) > 1;
-            my $condensed = 0;
-                
-            if ($curRes->is_problem()) {
+An example of a column renderer that will show the ID number of a
+resource, along with the part name if any:
 
-                # Is it multipart?
-                if ($multipart) {
-                    # If it's multipart, see if part 0 is "open"
-                    # if it is, display all parts, if it isn't,
-                    # just display first
-                    if (!$curRes->opendate("0")) {
-                        # no parts are open, display as one part
-                        @parts = ("0");
-                        $condensed = 1;
-                    } else {
-                        # Otherwise, only display part 0 if we want to 
-                        # attach feedback or email information to it
-                        if ($curRes->hasDiscussion() || $curRes->getFeedback()) {
-                            shift @parts;
-                        } else {
-                            # Now, we decide whether to condense the
-                            # parts due to similarity
-                            my $status = $curRes->status($parts[1]);
-                            my $due = $curRes->duedate($parts[1]);
-                            my $open = $curRes->opendate($parts[1]);
-                            my $statusAllSame = 1;
-                            my $dueAllSame = 1;
-                            my $openAllSame = 1;
-                            for (my $i = 2; $i < scalar(@parts); $i++) {
-                                if ($curRes->status($parts[$i]) != $status){
-                                    $statusAllSame = 0;
-                                }
-                                if ($curRes->duedate($parts[$i]) != $due ) {
-                                    $dueAllSame = 0;
-                                }
-                                if ($curRes->opendate($parts[$i]) != $open) {
-                                    $openAllSame = 0;
-                                }
-                            }
-                            
-                            # $allSame is true if all the statuses were
-                            # the same. Now, if they are all the same and
-                            # match one of the statuses to condense, or they
-                            # are all open with the same due date, or they are
-                            # all OPEN_LATER with the same open date, display the
-                            # status of the first non-zero part (to get the 'correct'
-                            # status right, since 0 is never 'correct' or 'open').
-                            if (($statusAllSame && defined($condenseStatuses{$status})) ||
-                                ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
-                                ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
-                                @parts = ($parts[1]);
-                                $condensed = 1;
-                            }
-                        }
-                    }
-                }
+ sub { 
+  my ($resource, $part, $params) = @_;   
+  if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
+  return '<td>' . $resource->{ID} . '</td>';
+ }
 
-            } else {
-                $parts[0] = "0"; # this is to get past foreach loop below
-                 # you can consider a non-problem resource as a resource
-                  # with only one part without loss, and it simplifies the looping
-            }
+Note these functions are responsible for the TD tags, which allow them
+to override vertical and horizontal alignment, etc.
 
-            # Is it a multipart problem with a single part, now in 
-            # @parts with "0" filtered out? If so, 'forget' it's a multi-part
-            # problem and treat it like a single-part problem.
-            if ( scalar(@parts) == 1 ) {
-                $multipart = 0;
-            }
+=head2 Parameters
 
-            # Display one part, in event of network error.
-            # If this is a single part, we can at least show the correct
-            # status, but if it's multipart, we're lost, since we can't
-            # retreive the metadata to count the parts
-            if ($curRes->{RESOURCE_ERROR}) {
-                @parts = ("0");
-            }
+Minimally, you should be
+able to get away with just using 'cols' (to specify the columns
+shown), 'url' (necessary for the folders to link to the current screen
+correctly), and possibly 'queryString' if your app calls for it. In
+that case, maintaining the state of the folders will be done
+automatically.
 
-            # Step Two: Print the actual data.
+=over 4
 
-            # For each part we intend to display...
-            foreach my $part (@parts) {
+=item * B<iterator>: default: constructs one from %env
 
-                my $nonLinkedText = ""; # unlinked stuff after title
-                
-                my $stack = $mapIterator->getStack();
-                my $src = getLinkForResource($stack);
+A reference to a fresh ::iterator to use from the navmaps. The
+rendering will reflect the options passed to the iterator, so you can
+use that to just render a certain part of the course, if you like. If
+one is not passed, the renderer will attempt to construct one from
+env{'form.filter'} and env{'form.condition'} information, plus the
+'iterator_map' parameter if any.
 
-                # Pass the correct symb on the querystring, so the
-                # remote will figure out where we are if we click a link
-                my $srcHasQuestion = $src =~ /\?/;
-                my $link = $src.
-                    ($srcHasQuestion?'&':'?') .
-                    'symb='.&Apache::lonnet::escape($curRes->symb()).
-                    '"';
-
-                my $title = $curRes->compTitle();
-                my $partLabel = "";
-                my $newBranchText = "";
-
-                # If this is a new branch, label it so
-                if ($isNewBranch) {
-                    $newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";
-                    $isNewBranch = 0;
-                }
-
-                # links to open and close the folders
-                my $linkopen = "<a href=\"$link\">";
-                my $linkclose = "</a>";
-
-                my $icon = "<img src=\"/adm/lonIcons/html.gif\" alt=\"\" border=\"0\" />";
-                if ($curRes->is_problem()) { 
-                    if ($part eq "0" || $condensed) {
-                        $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border=\"0\" />'; 
-                    } else {
-                        $icon = $indentString;
-                    }
-                }
+=item * B<iterator_map>: default: not used
 
-                # Display the correct icon, link to open or shut map
-                if ($curRes->is_map()) { 
-                    my $mapId = $curRes->map_pc();
-                    my $nowOpen = (!defined($filterHash{$mapId}));
-                    if ($condition) {$nowOpen = !$nowOpen;}
-                    $icon = $nowOpen ?
-                        "navmap.folder.closed.gif" : "navmap.folder.open.gif";
-                    $icon = "<img src=\"/adm/lonIcons/$icon\" alt=\"\" border=\"0\" />";
-                    $linkopen = "<a href=\"/adm/navmaps?filter=";
-                    $linkopen .= ($nowOpen xor $condition) ? 
-                        addToFilter(\%filterHash, $mapId) :
-                        removeFromFilter(\%filterHash, $mapId);
-                    $linkopen .= "&condition=$condition&$queryAdd" . 
-                        "&hereType=$hereType&here=" . 
-                        Apache::lonnet::escape($here) . "&jumpType=$SYMB&" .
-                        "jump=" . Apache::lonnet::escape($curRes->symb()) ."\">";
-                    $linkclose = "</a>";
+If you are letting the renderer do the iterator handling, you can
+instruct the renderer to render only a particular map by passing it
+the source of the map you want to process, like
+'/res/103/jerf/navmap.course.sequence'.
 
-                }
-                
-                my $colorizer = "";
-                my $color;
-                if ($curRes->is_problem()) {
-                    $color = $colormap{$curRes->status};
+=item * B<include_top_level_map>: default: false
 
-                    if (dueInLessThen24Hours($curRes, $part) ||
-                        lastTry($curRes, $part)) {
-                        $color = $hurryUpColor;
-                    }
+If you need to include the top level map (meaning the course) in the
+rendered output set this to true
 
-                    if ($color ne "") {
-                        $colorizer = "bgcolor=\"$color\"";
-                    }
-                }
+=item * B<navmap>: default: constructs one from %env
 
-                if ($curRes->randomout()) {
-                    $nonLinkedText .= ' <i>(hidden)</i> ';
-                }
+A reference to a navmap, used only if an iterator is not passed in. If
+this is necessary to make an iterator but it is not passed in, a new
+one will be constructed based on env info. This is useful to do basic
+error checking before passing it off to render.
 
-                $rowNum++;
-                my $backgroundColor = $backgroundColors[$rowNum % scalar(@backgroundColors)];
+=item * B<r>: default: must be passed in
 
-                # FIRST COL: The resource indentation, branch icon, name, and anchor
-                $r->print("  <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\">\n");
+The standard Apache response object. This must be passed to the
+renderer or the course hash will be locked.
 
-                # Print the anchor if necessary
-                if ($counter == $currentJumpIndex - $currentJumpDelta ) {
-                    $r->print('<a name="curloc" />');
-                    $displayedJumpMarker = 1;
-                }
+=item * B<cols>: default: empty (useless)
 
-                # print indentation
-                for (my $i = 0; $i < $indentLevel - $deltalevel; $i++) {
-                    $r->print($indentString);
-                }
+An array reference
 
-                $r->print("  ${newBranchText}${linkopen}$icon${linkclose}\n");
+=item * B<showParts>:default true
 
-                my $curMarkerBegin = "";
-                my $curMarkerEnd = "";
+A flag. If true, a line for the resource itself, and a line
+for each part will be displayed. If not, only one line for each
+resource will be displayed.
 
-                # Is this the current resource?
-                if (!$displayedHereMarker && 
-                    (($hereType == $SYMB && $curRes->symb eq $here) ||
-                    ($hereType == $URL && $curRes->src eq $here))) {
-                    $curMarkerBegin = '<font color="red" size="+2">&gt; </font>';
-                    $curMarkerEnd = '<font color="red" size="+2"> &lt;</font>';
-                    $displayedHereMarker = 1;
-                }
+=item * B<condenseParts>: default true
 
-                if ($curRes->is_problem() && $part ne "0" && !$condensed) { 
-                    $partLabel = " (Part $part)"; 
-                    $title = "";
-                }
-                if ($multipart && $condensed) {
-                    $nonLinkedText .= ' (' . $curRes->countParts() . ' parts)';
-                }
+A flag. If true, if all parts of the problem have the same
+status and that status is Nothing Set, Correct, or Network Failure,
+then only one line will be displayed for that resource anyhow. If no,
+all parts will always be displayed. If showParts is 0, this is
+ignored.
 
-                $r->print("  $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");
+=item * B<jumpCount>: default: determined from %env
 
-                #if ($curRes->{RESOURCE_ERROR}) {
-                #    $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",
-                #                              '<font size="-1">Host down</font>'));
-                #    }
+A string identifying the URL to place the anchor 'curloc' at.
+It is the responsibility of the renderer user to
+ensure that the #curloc is in the URL. By default, determined through
+the use of the env{} 'jump' information, and should normally "just
+work" correctly.
 
-                $r->print("</td>\n");
+=item * B<here>: default: empty string
 
-                # SECOND COL: Is there text, feedback, errors??
-                my $discussionHTML = ""; my $feedbackHTML = "";
+A Symb identifying where to place the 'here' marker. The empty
+string means no marker.
 
-                if ($curRes->hasDiscussion()) {
-                    $discussionHTML = $linkopen .
-                        '<img border="0" src="/adm/lonMisc/chat.gif" />' .
-                        $linkclose;
-                }
+=item * B<indentString>: default: 25 pixel whitespace image
 
-                if ($curRes->getFeedback()) {
-                    my $feedback = $curRes->getFeedback();
-                    foreach (split(/\,/, $feedback)) {
-                        if ($_) {
-                            $feedbackHTML .= '&nbsp;<a href="/adm/email?display='
-                                . &Apache::lonnet::escape($_) . '">'
-                                . '<img src="/adm/lonMisc/feedback.gif" '
-                                . 'border="0" /></a>';
-                        }
-                    }
-                }
+A string identifying the indentation string to use. 
 
-                $r->print("<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML&nbsp;</td>");
+=item * B<queryString>: default: empty
 
-                # Is this the first displayed part of a multi-part problem
-                # that has not been condensed, so we should suppress these two
-                # columns so we don't display useless status info about part
-                # "0"?
-                my $firstDisplayed = !$condensed && $multipart && $part eq "0";
-
-                # THIRD COL: Problem status icon
-                if ($curRes->is_problem() &&
-                    !$firstDisplayed) {
-                    my $icon = $statusIconMap{$curRes->status($part)};
-                    my $alt = $iconAltTags{$icon};
-                    if ($icon) {
-                        $r->print("<td width=\"30\" valign=\"center\" width=\"50\" align=\"right\">$linkopen<img width=\"25\" height=\"25\" src=\"/adm/lonIcons/$icon\" border=\"0\" alt=\"$alt\" />$linkclose</td>\n");
-                    } else {
-                        $r->print("<td width=\"30\">&nbsp;</td>\n");
-                    }
-                } else { # not problem, no icon
-                    $r->print("<td width=\"30\">&nbsp;</td>\n");
-                }
+A string which will be prepended to the query string used when the
+folders are opened or closed. You can use this to pass
+application-specific values.
 
-                # FOURTH COL: Text description
-                $r->print("<td align=\"right\" valign=\"center\">\n");
-                
-                if ($curRes->kind() eq "res" &&
-                    $curRes->is_problem() &&
-                    !$firstDisplayed) {
-                    $r->print ("<font color=\"$color\"><b>") if ($color);
-                    $r->print (getDescription($curRes, $part));
-                    $r->print ("</b></font>") if ($color);
-                }
-                if ($curRes->is_map() && advancedUser() && $curRes->randompick()) {
-                    $r->print('(randomly select ' . $curRes->randompick() .')');
-                }
+=item * B<url>: default: none
 
-                $r->print("&nbsp;</td></tr>\n");
+The url the folders will link to, which should be the current
+page. Required if the resource info column is shown, and you 
+are allowing the user to open and close folders.
 
-                if (!($counter % 20)) { $r->rflush(); }
-                if ($counter == 2) { $r->rflush(); }
-            }
-        }
-        $curRes = $mapIterator->next();
-    }
+=item * B<currentJumpIndex>: default: no jumping
 
-    $r->print("</table>");
+Describes the currently-open row number to cause the browser to jump
+to, because the user just opened that folder. By default, pulled from
+the Jump information in the env{'form.*'}.
 
-    # Print out the part that jumps to #curloc if it exists
-    if ($displayedJumpMarker) {
-        $r->print('<script>location += "#curloc";</script>');
-    }
+=item * B<printKey>: default: false
 
-    $r->print("</body></html>");
+If true, print the key that appears on the top of the standard
+navmaps.
 
-    $navmap->untieHashes();
+=item * B<printCloseAll>: default: true
 
-    return OK;
-}
+If true, print the "Close all folders" or "open all folders"
+links.
+
+=item * B<filterFunc>: default: sub {return 1;} (accept everything)
+
+A function that takes the resource object as its only parameter and
+returns a true or false value. If true, the resource is displayed. If
+false, it is simply skipped in the display.
+
+=item * B<suppressEmptySequences>: default: false
+
+If you're using a filter function, and displaying sequences to orient
+the user, then frequently some sequences will be empty. Setting this to
+true will cause those sequences not to display, so as not to confuse the
+user into thinking that if the sequence is there there should be things
+under it; for example, see the "Show Uncompleted Homework" view on the
+B<NAV> screen.
+
+=item * B<suppressNavmaps>: default: false
+
+If true, will not display Navigate Content resources. 
+
+=back
+
+=head2 Additional Info
+
+In addition to the parameters you can pass to the renderer, which will
+be passed through unchange to the column renderers, the renderer will
+generate the following information which your renderer may find
+useful:
+
+=over 4
+
+=item * B<counter>: 
+
+Contains the number of rows printed. Useful after calling the render 
+function, as you can detect whether anything was printed at all.
+
+=item * B<isNewBranch>:
+
+Useful for renderers: If this resource is currently the first resource
+of a new branch, this will be true. The Resource column (leftmost in the
+navmaps screen) uses this to display the "new branch" icon 
+
+=back
+
+=cut
+
+
+=head1 SUBROUTINES
+
+=over
+
+=item update()
+
+=item addToFilter()
+
+Convenience functions: Returns a string that adds or subtracts
+the second argument from the first hash, appropriate for the 
+query string that determines which folders to recurse on
+
+=item removeFromFilter()
+
+=item getLinkForResource()
+
+Convenience function: Given a stack returned from getStack on the iterator,
+return the correct src() value.
+
+=item getDescription()
+
+Convenience function: This separates the logic of how to create
+the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
+etc.) into a separate function. It takes a resource object as the
+first parameter, and the part number of the resource as the second.
+It's basically a big switch statement on the status of the resource.
+
+=item dueInLessThan24Hours()
+
+Convenience function, so others can use it: Is the problem due in less than 24 hours, and still can be done?
+
+=item lastTry()
+
+Convenience function, so others can use it: Is there only one try remaining for the
+part, with more than one try to begin with, not due yet and still can be done?
+
+=item advancedUser()
+
+This puts a human-readable name on the env variable.
+
+=item timeToHumanString()
+
+timeToHumanString takes a time number and converts it to a
+human-readable representation, meant to be used in the following
+manner:
+
+=over 4
+
+=item * print "Due $timestring"
+
+=item * print "Open $timestring"
+
+=item * print "Answer available $timestring"
+
+=back
+
+Very, very, very, VERY English-only... goodness help a localizer on
+this func...
+
+=item resource()
+
+returns 0
+
+=item communication_status()
+
+returns 1
+
+=item quick_status()
+
+returns 2
+
+=item long_status()
+
+returns 3
+
+=item part_status_summary()
+
+returns 4
+
+=item render_resource()
+
+=item render_communication_status()
+
+=item render_quick_status()
+
+=item render_long_status()
+
+=item render_parts_summary_status()
+
+=item setDefault()
+
+=item cmp_title()
+
+=item render()
+
+=item add_linkitem()
+
+=item show_linkitems_toolbar()
+
+=back
+
+=cut
+
+package Apache::lonnavmaps;
+
+use strict;
+use GDBM_File;
+use Apache::loncommon();
+use Apache::lonenc();
+use Apache::lonlocal;
+use Apache::lonnet;
+use Apache::lonmap;
+
+use POSIX qw (ceil floor strftime);
+use Time::HiRes qw( gettimeofday tv_interval );
+use LONCAPA;
+use DateTime();
+use HTML::Entities;
+
+# For debugging
+
+#use Data::Dumper;
+
+
+# symbolic constants
+sub SYMB { return 1; }
+sub URL { return 2; }
+sub NOTHING { return 3; }
+
+# Some data
+
+my $resObj = "Apache::lonnavmaps::resource";
+
+# Keep these mappings in sync with lonquickgrades, which usesthe colors
+# instead of the icons.
+my %statusIconMap = 
+    (
+     $resObj->CLOSED       => '',
+     $resObj->OPEN         => 'navmap.open.gif',
+     $resObj->CORRECT      => 'navmap.correct.gif',
+     $resObj->PARTIALLY_CORRECT      => 'navmap.partial.gif',
+     $resObj->INCORRECT    => 'navmap.wrong.gif',
+     $resObj->ATTEMPTED    => 'navmap.ellipsis.gif',
+     $resObj->ERROR        => ''
+     );
+
+my %iconAltTags =   #texthash does not work here
+    ( 'navmap.correct.gif'  => 'Correct',
+      'navmap.wrong.gif'    => 'Incorrect',
+      'navmap.open.gif'     => 'Is Open',
+      'navmap.partial.gif'  => 'Partially Correct',
+      'navmap.ellipsis.gif' => 'Attempted',
+     );
+
+# Defines a status->color mapping, null string means don't color
+my %colormap = 
+    ( $resObj->NETWORK_FAILURE        => '',
+      $resObj->CORRECT                => '',
+      $resObj->EXCUSED                => '#3333FF',
+      $resObj->PAST_DUE_ANSWER_LATER  => '',
+      $resObj->PAST_DUE_NO_ANSWER     => '',
+      $resObj->ANSWER_OPEN            => '#006600',
+      $resObj->OPEN_LATER             => '',
+      $resObj->TRIES_LEFT             => '',
+      $resObj->INCORRECT              => '',
+      $resObj->OPEN                   => '',
+      $resObj->NOTHING_SET            => '',
+      $resObj->ATTEMPTED              => '',
+      $resObj->CREDIT_ATTEMPTED       => '',
+      $resObj->ANSWER_SUBMITTED       => '',
+      $resObj->PARTIALLY_CORRECT      => '#006600'
+      );
+# And a special case in the nav map; what to do when the assignment
+# is not yet done and due in less than 24 hours
+my $hurryUpColor = "#FF0000";
 
-# Convenience functions: Returns a string that adds or subtracts
-# the second argument from the first hash, appropriate for the 
-# query string that determines which folders to recurse on
 sub addToFilter {
     my $hashIn = shift;
     my $addition = shift;
@@ -696,17 +582,30 @@ sub removeFromFilter {
     return join(",", keys(%hash));
 }
 
-# Convenience function: Given a stack returned from getStack on the iterator,
-# return the correct src() value.
-# Later, this should add an anchor when we start putting anchors in pages.
 sub getLinkForResource {
     my $stack = shift;
     my $res;
 
     # Check to see if there are any pages in the stack
     foreach $res (@$stack) {
-        if (defined($res) && $res->is_page()) {
-            return $res->src();
+        if (defined($res)) {
+	    my $anchor;
+	    if ($res->is_page()) {
+		foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; }  }
+		if ($anchor->encrypted() && !&advancedUser()) {
+		    $anchor='LC_'.$anchor->id();
+		} else {
+		    $anchor=&escape($anchor->shown_symb());
+		}
+		return ($res->link(),$res->shown_symb(),$anchor);
+	    }
+            # in case folder was skipped over as "only sequence"
+	    my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
+	    if ($map=~/\.page$/) {
+		my $url=&Apache::lonnet::clutter($map);
+		$anchor=&escape($res->shown_symb());
+		return ($url,$res->shown_symb(),$anchor);
+	    }
         }
     }
 
@@ -714,88 +613,161 @@ sub getLinkForResource {
     # (when we first recurse on a map, it puts an undefined resource
     # on the bottom because $self->{HERE} isn't defined yet, and we
     # want the src for the map anyhow)
-    foreach (@$stack) {
-        if (defined($_)) { $res = $_; }
+    foreach my $item (@$stack) {
+        if (defined($item)) { $res = $item; }
     }
 
-    return $res->src();
+    if ($res) {
+	return ($res->link(),$res->shown_symb());
+    }
+    return;
 }
 
-# Convenience function: This seperates the logic of how to create
-# the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
-# etc.) into a seperate function. It takes a resource object as the
-# first parameter, and the part number of the resource as the second.
-# It's basically a big switch statement on the status of the resource.
+
 
 sub getDescription {
     my $res = shift;
     my $part = shift;
     my $status = $res->status($part);
 
-    if ($status == $res->NETWORK_FAILURE) { return ""; }
+    my $open = $res->opendate($part);
+    my $due = $res->duedate($part);
+    my $answer = $res->answerdate($part);
+
+    if ($status == $res->NETWORK_FAILURE) { 
+        return &mt("Having technical difficulties; please check status later"); 
+    }
     if ($status == $res->NOTHING_SET) {
-        return "Not currently assigned.";
+        return &Apache::lonhtmlcommon::direct_parm_link(&mt('Not currently assigned'),$res->symb(),'opendate',$part);
     }
     if ($status == $res->OPEN_LATER) {
-        return "Open " . timeToHumanString($res->opendate($part));
+        return &mt("Open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($open,'start'),$res->symb(),'opendate',$part));
+    }
+    my $slotinfo;
+    if ($res->simpleStatus($part) == $res->OPEN) {
+        unless (&Apache::lonnet::allowed('mgr',$env{'request.course.id'})) {
+            my ($slot_status,$slot_time,$slot_name)=$res->check_for_slot($part);
+            my $slotmsg;
+            if ($slot_status == $res->UNKNOWN) {
+                $slotmsg = &mt('Reservation status unknown');
+            } elsif ($slot_status == $res->RESERVED) {
+                $slotmsg = &mt('Reserved - ends [_1]',
+                           timeToHumanString($slot_time,'end'));
+            } elsif ($slot_status == $res->RESERVED_LOCATION) {
+                $slotmsg = &mt('Reserved - specific location(s) - ends [_1]',
+                           timeToHumanString($slot_time,'end'));
+            } elsif ($slot_status == $res->RESERVED_LATER) {
+                $slotmsg = &mt('Reserved - next open [_1]',
+                           timeToHumanString($slot_time,'start'));
+            } elsif ($slot_status == $res->RESERVABLE) {
+                $slotmsg = &mt('Reservable, reservations close [_1]',
+                           timeToHumanString($slot_time,'end'));
+            } elsif ($slot_status == $res->NEEDS_CHECKIN) {
+                $slotmsg = &mt('Reserved, check-in needed - ends [_1]',
+                           timeToHumanString($slot_time,'end'));
+            } elsif ($slot_status == $res->RESERVABLE_LATER) {
+                $slotmsg = &mt('Reservable, reservations open [_1]',
+                           timeToHumanString($slot_time,'start'));
+            } elsif ($slot_status == $res->NOT_IN_A_SLOT) {
+                $slotmsg = &mt('Reserve a time/place to work');
+            } elsif ($slot_status == $res->NOTRESERVABLE) {
+                $slotmsg = &mt('Reservation not available');
+            } elsif ($slot_status == $res->WAITING_FOR_GRADE) {
+                $slotmsg = &mt('Submission in grading queue');
+            }
+            if ($slotmsg) {
+                if ($res->is_task() || !$due) {
+                     return $slotmsg;
+                }
+                $slotinfo = ('&nbsp;' x 2).'('.$slotmsg.')';
+            }
+        }
     }
     if ($status == $res->OPEN) {
-        if ($res->duedate($part)) {
-            return "Due " . timeToHumanString($res->duedate($part));
+        if ($due) {
+	    if ($res->is_practice()) {
+		return &mt("Closes [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'duedate',$part)).$slotinfo;
+	    } else {
+		return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part)).$slotinfo;
+	    }
         } else {
-            return "Open, no due date";
+            return &Apache::lonhtmlcommon::direct_parm_link(&mt("Open, no due date"),$res->symb(),'duedate',$part).$slotinfo;
         }
     }
     if ($status == $res->PAST_DUE_ANSWER_LATER) {
-        return "Answer open " . timeToHumanString($res->answerdate($part));
+        return &mt("Answer open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($answer,'start'),$res->symb(),'answerdate',$part));
     }
     if ($status == $res->PAST_DUE_NO_ANSWER) {
-        return "Was due " . timeToHumanString($res->duedate($part));
-    }
-    if ($status == $res->ANSWER_OPEN) {
-        return "Answer available";
+	if ($res->is_practice()) {
+	    return &mt("Closed [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'answerdate,duedate',$part));
+	} else {
+	    return &mt("Was due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'answerdate,duedate',$part));
+	}
+    }
+    if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT)
+	&& $res->handgrade($part) ne 'yes') {
+        my $msg = &mt('Answer available');
+        my $parmlist = 'answerdate,duedate';
+        if (($res->is_tool) && ($res->is_gradable())) {
+            if (($status == $res->PARTIALLY_CORRECT) && ($res->parmval('retrypartial',$part))) {
+                $msg = &mt('Grade received');
+                $parmlist = 'retrypartial';
+            } else {
+                $msg = &mt('Grade available');
+            }
+        }
+        return &Apache::lonhtmlcommon::direct_parm_link($msg,$res->symb(),$parmlist,$part);
     }
     if ($status == $res->EXCUSED) {
-        return "Excused by instructor";
+        return &mt("Excused by instructor");
     }
     if ($status == $res->ATTEMPTED) {
-        return "Not yet graded.";
+        if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
+            return &mt("Survey submission recorded");
+        } else {
+            return &mt("Answer submitted, not yet graded");
+        }
+    }
+    if ($status == $res->CREDIT_ATTEMPTED) {
+        if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
+            return &mt("Credit for survey submission");
+        }
     }
     if ($status == $res->TRIES_LEFT) {
         my $tries = $res->tries($part);
         my $maxtries = $res->maxtries($part);
         my $triesString = "";
         if ($tries && $maxtries) {
-            $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
+            $triesString = '<span class="LC_fontsize_medium"><i>('.&mt('[_1] of [quant,_2,try,tries] used',$tries,$maxtries).')</i></span>';
             if ($maxtries > 1 && $maxtries - $tries == 1) {
                 $triesString = "<b>$triesString</b>";
             }
         }
-        if ($res->duedate()) {
-            return "Due " . timeToHumanString($res->duedate($part)) .
+        if ($due) {
+            return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part)) .
                 " $triesString";
         } else {
-            return "No due date $triesString";
+            return &Apache::lonhtmlcommon::direct_parm_link(&mt("No due date"),$res->symb(),'duedate',$part)." $triesString";
         }
     }
+    if ($status == $res->ANSWER_SUBMITTED) {
+        return &mt('Answer submitted');
+    }
 }
 
-# Convenience function, so others can use it: Is the problem due in less then
-# 24 hours, and still can be done?
 
-sub dueInLessThen24Hours {
+sub dueInLessThan24Hours {
     my $res = shift;
     my $part = shift;
     my $status = $res->status($part);
 
-    return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
+    return ($status == $res->OPEN() ||
             $status == $res->TRIES_LEFT()) &&
-           $res->duedate() && $res->duedate() < time()+(24*60*60) &&
-           $res->duedate() > time();
+	    $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
+	    $res->duedate($part) > time();
 }
 
-# Convenience function, so others can use it: Is there only one try remaining for the
-# part, with more then one try to begin with, not due yet and still can be done?
+
 sub lastTry {
     my $res = shift;
     my $part = shift;
@@ -803,36 +775,27 @@ sub lastTry {
     my $tries = $res->tries($part);
     my $maxtries = $res->maxtries($part);
     return $tries && $maxtries && $maxtries > 1 &&
-        $maxtries - $tries == 1 && $res->duedate() &&
-        $res->duedate() > time();
+        $maxtries - $tries == 1 && $res->duedate($part) &&
+        $res->duedate($part) > time();
 }
 
-# This puts a human-readable name on the ENV variable.
+
 sub advancedUser {
-    return $ENV{'user.adv'};
+    return $env{'request.role.adv'};
 }
 
-
-# timeToHumanString takes a time number and converts it to a
-# human-readable representation, meant to be used in the following
-# manner:
-# print "Due $timestring"
-# print "Open $timestring"
-# print "Answer available $timestring"
-# Very, very, very, VERY English-only... goodness help a localizer on
-# this func...
 sub timeToHumanString {
-    my ($time) = @_;
+    my ($time,$type,$format) = @_;
+
     # zero, '0' and blank are bad times
     if (!$time) {
-        return 'never';
+        return &mt('never');
     }
-
+    unless (&Apache::lonlocal::current_language()=~/^en/) {
+	return &Apache::lonlocal::locallocaltime($time);
+    } 
     my $now = time();
 
-    my @time = localtime($time);
-    my @now = localtime($now);
-
     # Positive = future
     my $delta = $time - $now;
 
@@ -858,22 +821,39 @@ sub timeToHumanString {
         my $tense = $inPast ? " ago" : "";
         my $prefix = $inPast ? "" : "in ";
         
-        # Less then a minute
+        # Less than a minute
         if ( $delta < $minute ) {
             if ($delta == 1) { return "${prefix}1 second$tense"; }
             return "$prefix$delta seconds$tense";
         }
 
-        # Less then an hour
+        # Less than an hour
         if ( $delta < $hour ) {
-            # If so, use minutes
+            # If so, use minutes; or minutes, seconds (if format requires)
             my $minutes = floor($delta / 60);
+            if (($format ne '') && ($format =~ /\%(T|S)/)) {
+                my $display;
+                if ($minutes == 1) {
+                    $display = "${prefix}1 minute";
+                } else {
+                    $display = "$prefix$minutes minutes";
+                }
+                my $seconds = $delta % $minute;
+                if ($seconds == 0) {
+                    $display .= $tense;
+                } elsif ($seconds == 1) {
+                    $display .= ", 1 second$tense";
+                } else {
+                    $display .= ", $seconds seconds$tense";
+                }
+                return $display;
+            }
             if ($minutes == 1) { return "${prefix}1 minute$tense"; }
             return "$prefix$minutes minutes$tense";
         }
         
-        # Is it less then 24 hours away? If so,
-        # display hours + minutes
+        # Is it less than 24 hours away? If so,
+        # display hours + minutes, (and + seconds, if format specified it)  
         if ( $delta < $hour * 24) {
             my $hours = floor($delta / $hour);
             my $minutes = floor(($delta % $hour) / $minute);
@@ -888,75 +868,1364 @@ sub timeToHumanString {
             if ($minutes == 0) {
                 $minuteString = "";
             }
+            if (($format ne '') && ($format =~ /\%(T|S)/)) {
+                my $display = "$prefix$hourString$minuteString";
+                my $seconds = $delta-(($hours * $hour)+($minutes * $minute));
+                if ($seconds == 0) {
+                    $display .= $tense;
+                } elsif ($seconds == 1) {
+                    $display .= ", 1 second$tense";
+                } else {
+                    $display .= ", $seconds seconds$tense";
+                }
+                return $display;
+            }
             return "$prefix$hourString$minuteString$tense";
         }
 
-        # Less then 5 days away, display day of the week and
+        # Date/time is more than 24 hours away
+
+	my $dt = DateTime->from_epoch(epoch => $time)
+	                 ->set_time_zone(&Apache::lonlocal::gettimezone());
+
+	# If there's a caller supplied format, use it, unless it only displays
+        # H:M:S or H:M.
+
+	if (($format ne '') && ($format ne '%T') && ($format ne '%R')) {
+	    my $timeStr = $dt->strftime($format);
+	    return $timeStr.' ('.$dt->time_zone_short_name().')';
+	}
+
+        # Less than 5 days away, display day of the week and
         # HH:MM
+
         if ( $delta < $day * 5 ) {
-            my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
-            $timeStr =~ s/12:00 am/midnight/;
+            my $timeStr = $dt->strftime("%A, %b %e at %I:%M %P (%Z)");
+            $timeStr =~ s/12:00 am/00:00/;
             $timeStr =~ s/12:00 pm/noon/;
-            return ($inPast ? "last " : "next ") .
+            return ($inPast ? "last " : "this ") .
                 $timeStr;
         }
         
+	my $conjunction='on';
+	if ($type eq 'start') {
+	    $conjunction='at';
+	} elsif ($type eq 'end') {
+	    $conjunction='by';
+	}
         # Is it this year?
-        if ( $time[5] == $now[5]) {
+	my $dt_now = DateTime->from_epoch(epoch => $now)
+	                     ->set_time_zone(&Apache::lonlocal::gettimezone());
+        if ( $dt->year() == $dt_now->year()) {
             # Return on Month Day, HH:MM meridian
-            my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
-            $timeStr =~ s/12:00 am/midnight/;
+            my $timeStr = $dt->strftime("$conjunction %A, %b %e at %I:%M %P (%Z)");
+            $timeStr =~ s/12:00 am/00:00/;
             $timeStr =~ s/12:00 pm/noon/;
             return $timeStr;
         }
 
         # Not this year, so show the year
-        my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
-        $timeStr =~ s/12:00 am/midnight/;
+        my $timeStr = 
+	    $dt->strftime("$conjunction %A, %b %e %Y at %I:%M %P (%Z)");
+        $timeStr =~ s/12:00 am/00:00/;
         $timeStr =~ s/12:00 pm/noon/;
         return $timeStr;
     }
 }
 
+
+sub resource { return 0; }
+sub communication_status { return 1; }
+sub quick_status { return 2; }
+sub long_status { return 3; }
+sub part_status_summary { return 4; }
+
+sub render_resource {
+    my ($resource, $part, $params) = @_;
+
+    my $editmapLink;
+    my $nonLinkedText = ''; # stuff after resource title not in link
+
+    my $link = $params->{"resourceLink"};
+    if ($resource->ext()) {
+        $link =~ s/\#.+(\?)/$1/g;
+    }
+
+    #  The URL part is not escaped at this point, but the symb is... 
+
+    my $src = $resource->src();
+    my $it = $params->{"iterator"};
+    my $filter = $it->{FILTER};
+
+    my $title = $resource->compTitle();
+
+    my $partLabel = "";
+    my $newBranchText = "";
+    my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
+    # If this is a new branch, label it so
+    if ($params->{'isNewBranch'}) {
+        $newBranchText = "<img src='$location/branch.gif' alt=".mt('Branch')." />";
+    }
+
+    my $whitespace = $location.'/whitespace_21.gif';
+    my ($nomodal,$linkopen,$linkclose);
+    unless ($resource->is_map() || $params->{'resource_nolink'}) {
+        $linkopen = "<img src='$whitespace' alt='' />";
+        $linkclose = "</a>";
+        if (($params->{'modalLink'}) && (!$resource->is_sequence())) {
+            if ($link =~m{^(?:|/adm/wrapper)/ext/([^#]+)}) {
+                my $exturl = $1;
+                if (($ENV{'SERVER_PORT'} == 443) && ($exturl !~ /^https:/)) {
+                    $nomodal = 1;
+                }
+            } elsif (($link eq "/public/$LONCAPA::match_domain/$LONCAPA::match_courseid/syllabus") &&
+                     ($env{'request.course.id'}) && ($ENV{'SERVER_PORT'} == 443) &&
+                     ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
+                $nomodal = 1;
+            }
+            my $esclink = &js_escape($link);
+            if ($nomodal) {
+                $linkopen .= "<a href=\"#\" onclick=\"javascript:window.open('$esclink','resourcepreview','height=400,width=500,scrollbars=1,resizable=1,menubar=0,location=1'); return false;\" />";
+            } else {
+                $linkopen .= "<a href=\"$link\" onclick=\"javascript:openMyModal('$esclink',600,500,'yes','true'); return false;\">";
+            }
+        } else {
+            $linkopen .= "<a href=\"$link\">";
+        }
+    }
+
+    # Default icon: unknown page
+    my $icon = "<img class=\"LC_contentImage\" src='$location/unknown.gif' alt='' />";
+    
+    if ($resource->is_problem()) {
+        if ($part eq '0' || $params->{'condensed'}) {
+	    $icon = '<img class="LC_contentImage" src="'.$location.'/';
+	    if ($resource->is_task()) {
+		$icon .= 'task.gif" alt="'.&mt('Task');
+	    } else {
+		$icon .= 'problem.gif" alt="'.&mt('Problem');
+	    }
+	    $icon .='" />';
+        } else {
+            $icon = $params->{'indentString'};
+        }
+    } else {
+	$icon = "<img class=\"LC_contentImage\" src='".&Apache::loncommon::icon($resource->src)."' alt='' />";
+    }
+
+    # Display the correct map icon to open or shut map
+    if ($resource->is_map()) {
+        my $mapId = $resource->map_pc();
+        my $nowOpen = !defined($filter->{$mapId});
+        if ($it->{CONDITION}) {
+            $nowOpen = !$nowOpen;
+        }
+	
+	my $folderType = $resource->is_sequence() ? 'folder' : 'page';
+        my $title=$resource->title;
+		$title=~s/\"/\&qout;/g;
+        if (!$params->{'resource_no_folder_link'}) {
+            $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
+            $icon = "<img src='$location/arrow." . ($nowOpen ? 'closed' : 'open') . ".gif' alt='' />"
+                    ."<img class=\"LC_contentImage\" src='$location/$icon' alt=\""
+                    .($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";			
+            $linkopen = "<a href=\"" . $params->{'url'} . '?' . 
+                $params->{'queryString'} . '&amp;filter=';
+            $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
+                addToFilter($filter, $mapId) :
+                removeFromFilter($filter, $mapId);
+            $linkopen .= "&amp;condition=" . $it->{CONDITION} . '&amp;hereType='
+                . $params->{'hereType'} . '&amp;here=' .
+                &escape($params->{'here'}) . 
+                '&amp;jump=' .
+                &escape($resource->symb()) . 
+                "&amp;folderManip=1\">";
+            $linkclose = '</a>';
+        } else {
+            # Don't allow users to manipulate folder
+            $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
+            $icon = "<img class=\"LC_space\" src='$whitespace' alt='' />"."<img class=\"LC_contentImage\" src='$location/$icon' alt=\"".($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
+            if ($params->{'caller'} eq 'sequence') {
+                $linkopen = "<a href=\"$link\">";
+                $linkclose = '</a>';
+            } else {
+                $linkopen = "";
+                $linkclose = "";
+            }
+        }
+        if (((&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) ||
+              (&Apache::lonnet::allowed('cev',$env{'request.course.id'}))) &&
+            ($resource->symb=~/\_\_\_[^\_]+\_\_\_uploaded/)) {
+            if (!$params->{'map_no_edit_link'}) {
+                my $icon = &Apache::loncommon::lonhttpdurl('/res/adm/pages').'/editmap.png';
+                $editmapLink='&nbsp;'.
+                         '<a href="/adm/coursedocs?command=directnav&amp;symb='.&escape($resource->symb()).'">'.
+                         '<img src="'.$icon.'" alt="'.&mt('Edit Content').'" title="'.&mt('Edit Content').'" />'.
+                         '</a>';
+            }
+        }
+        if ($params->{'mapHidden'} || $resource->randomout()) {
+            $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
+        } elsif ($params->{'mapUnlisted'}) {
+            $nonLinkedText .= ' <span class="LC_warning">('.&mt('unlisted').')</span> ';
+        } elsif ($params->{'mapHiddenDeepLink'} || $resource->deeplinkout()) {
+            $nonLinkedText .= ' <span class="LC_warning">('.&mt('not shown').')</span> ';
+        }
+    } else {
+        if ($resource->randomout()) {
+            $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
+        } elsif ($resource->deeplinkout()) {
+            $nonLinkedText .= ' <span class="LC_warning">('.&mt('not shown').')</span> ';
+        } else {
+            my $deeplink = $resource->deeplink($params->{caller});
+            if ((($deeplink eq 'absent') || ($deeplink eq 'grades')) &&
+                  &advancedUser()) {
+                $nonLinkedText .= ' <span class="LC_warning">('.&mt('unlisted').')</span> ';
+            } elsif (($deeplink) && ($deeplink) ne 'full') {
+                if (&advancedUser()) {
+                    $nonLinkedText .= ' <span class="LC_warning">('.&mt('deep-link access').
+                                      ')</span> ';
+                } else {
+                    $nonLinkedText .= ' <span class="LC_warning">('.&mt('access via external site').
+                                      ')</span> ';
+                }
+            }
+        }
+    }
+    if (!$resource->condval()) {
+        $nonLinkedText .= ' <span class="LC_info">('.&mt('conditionally hidden').')</span> ';
+    }
+    if (($resource->is_practice()) && ($resource->is_raw_problem())) {
+        $nonLinkedText .=' <span class="LC_info"><b>'.&mt('not graded').'</b></span>';
+    }
+
+    # We're done preparing and finally ready to start the rendering
+    my $result = '<td class="LC_middle">';
+    my $newfolderType = $resource->is_sequence() ? 'folder' : 'page';
+	
+    my $indentLevel = $params->{'indentLevel'};
+    if ($newBranchText) { $indentLevel--; }
+
+    # print indentation
+    for (my $i = 0; $i < $indentLevel; $i++) {
+        $result .= $params->{'indentString'};
+    }
+
+    # Decide what to display
+    $result .= "$newBranchText$linkopen$icon$linkclose";
+    
+    my $curMarkerBegin = '';
+    my $curMarkerEnd = '';
+
+    # Is this the current resource?
+    if (!$params->{'displayedHereMarker'} && 
+        $resource->symb() eq $params->{'here'} ) {
+        unless ($resource->is_map()) {
+            $curMarkerBegin = '<span class="LC_current_nav_location">';
+            $curMarkerEnd = '</span>';
+        }
+	$params->{'displayedHereMarker'} = 1;
+    }
+
+    if ($resource->is_problem() && $part ne '0' && 
+        !$params->{'condensed'}) {
+	my $displaypart=$resource->part_display($part);
+        $partLabel = " (".&mt('Part: [_1]', $displaypart).")";
+	if ($link!~/\#/) { $link.='#'.&escape($part); }
+        $title = "";
+    }
+
+    if ($params->{'condensed'} && $resource->countParts() > 1) {
+        $nonLinkedText .= ' ('.&mt('[_1] parts', $resource->countParts()).')';
+    }
+
+    if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
+        $linkclose = '</a>';
+        if ($params->{'modalLink'}) {
+            my $esclink = &js_escape($link);
+            if ($nomodal) {
+                $linkopen = "<a href=\"#\" onclick=\"javascript:window.open('$esclink','resourcepreview','height=400,width=500,scrollbars=1,resizable=1,menubar=0,location=1'); return false;\" />";
+            } else {
+                $linkopen = "<a href=\"$link\" onclick=\"javascript:openMyModal('$esclink',600,500,'yes','true'); return false;\">";
+            }
+        } else {
+            $linkopen = "<a href=\"$link\">";
+        }
+    }
+    $result .= "$curMarkerBegin$linkopen$title$partLabel$linkclose$curMarkerEnd$editmapLink$nonLinkedText</td>";
+
+    return $result;
+}
+
+sub render_communication_status {
+    my ($resource, $part, $params) = @_;
+    my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
+
+    my $link = $params->{"resourceLink"};
+    my $linkopen = "<a href=\"$link\">";
+    my $linkclose = "</a>";
+    my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
+
+    if ($resource->hasDiscussion()) {
+        $discussionHTML = $linkopen .
+            '<img alt="'.&mt('New Discussion').'" src="'.$location.'/chat.gif" title="'.&mt('New Discussion').'"/>' .
+            $linkclose;
+    }
+    
+    if ($resource->getFeedback()) {
+        my $feedback = $resource->getFeedback();
+        foreach my $msgid (split(/\,/, $feedback)) {
+            if ($msgid) {
+                $feedbackHTML .= '&nbsp;<a href="/adm/email?display='
+                    . &escape($msgid) . '">'
+                    . '<img alt="'.&mt('New E-mail').'" src="'.$location.'/feedback.gif" title="'.&mt('New E-mail').'"/></a>';
+            }
+        }
+    }
+    
+    if ($resource->getErrors()) {
+        my $errors = $resource->getErrors();
+        my $errorcount = 0;
+        foreach my $msgid (split(/,/, $errors)) {
+            last if ($errorcount>=10); # Only output 10 bombs maximum
+            if ($msgid) {
+                $errorcount++;
+                $errorHTML .= '&nbsp;<a href="/adm/email?display='
+                    . &escape($msgid) . '">'
+                    . '<img alt="'.&mt('New Error').'" src="'.$location.'/bomb.gif" title="'.&mt('New Error').'"/></a>';
+            }
+        }
+    }
+
+    if ($params->{'multipart'} && $part != '0') {
+	$discussionHTML = $feedbackHTML = $errorHTML = '';
+    }
+    return "<td class=\"LC_middle\">$discussionHTML$feedbackHTML$errorHTML&nbsp;</td>";
+
+}
+sub render_quick_status {
+    my ($resource, $part, $params) = @_;
+    my $result = "";
+    my $firstDisplayed = !$params->{'condensed'} && 
+        $params->{'multipart'} && $part eq "0";
+
+    my $link = $params->{"resourceLink"};
+    my $linkopen = "<a href=\"$link\">";
+    my $linkclose = "</a>";
+	
+	$result .= '<td class="LC_middle">';
+    if ($resource->is_gradable() &&
+        !$firstDisplayed) {
+        my $icon = $statusIconMap{$resource->simpleStatus($part)};
+        my $alt = $iconAltTags{$icon};
+        if ($icon) {
+	    my $location=
+		&Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
+		$result .= $linkopen.'<img src="'.$location.'" alt="'.&mt($alt).'" title="'.&mt($alt).'" />'.$linkclose;            
+        } else {
+            $result .= "&nbsp;";
+        }
+    } else { # not problem, no icon
+        $result .= "&nbsp;";
+    }
+	$result .= "</td>\n";
+    return $result;
+}
+sub render_long_status {
+    my ($resource, $part, $params) = @_;
+    my $result = '<td class="LC_middle LC_right">';
+    my $firstDisplayed = !$params->{'condensed'} && 
+        $params->{'multipart'} && $part eq "0";
+                
+    my $color;
+    my $info = '';
+    if ($resource->is_gradable() || $resource->is_practice()) {
+        $color = $colormap{$resource->status};
+
+        if (dueInLessThan24Hours($resource, $part)) {
+            $color = $hurryUpColor;
+            $info = ' title="'.&mt('Due in less than 24 hours!').'"';
+        } elsif (lastTry($resource, $part)) {
+            unless (($resource->problemstatus($part) eq 'no') ||
+                    ($resource->problemstatus($part) eq 'no_feedback_ever')) {
+                $color = $hurryUpColor;
+                $info = ' title="'.&mt('One try remaining!').'"';
+            }
+         }
+    }
+
+    if (($resource->kind() eq "res") &&
+        ($resource->is_raw_problem() || $resource->is_gradable()) &&
+        !$firstDisplayed) {
+        if ($color) {$result .= '<span style="color:'.$color.'"'.$info.'><b>'; }
+        $result .= getDescription($resource, $part);
+        if ($color) {$result .= "</b></span>"; }
+    }
+    if ($resource->is_map() && &advancedUser() && $resource->randompick()) {
+        $result .= &mt('(randomly select [_1])', $resource->randompick());
+    }
+    if ($resource->is_map() && &advancedUser() && $resource->randomorder()) {
+        $result .= &mt('(randomly ordered)');
+    }
+
+    # Debugging code
+    #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
+    #	' - Part: ' . $part;
+
+    $result .= "</td>\n";
+    
+    return $result;
+}
+
+# Colors obtained by taking the icons, matching the colors, and
+# possibly reducing the Value (HSV) of the color, if it's too bright
+# for text, generally by one third or so.
+my %statusColors = 
+    (
+     $resObj->CLOSED => '#000000',
+     $resObj->OPEN   => '#998b13',
+     $resObj->CORRECT => '#26933f',
+     $resObj->INCORRECT => '#c48207',
+     $resObj->ATTEMPTED => '#a87510',
+     $resObj->ERROR => '#000000'
+     );
+my %statusStrings = 
+    (
+     $resObj->CLOSED => 'Not yet open',
+     $resObj->OPEN   => 'Open',
+     $resObj->CORRECT => 'Correct',
+     $resObj->INCORRECT => 'Incorrect',
+     $resObj->ATTEMPTED => 'Attempted',
+     $resObj->ERROR => 'Network Error'
+     );
+my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
+
+sub render_parts_summary_status {
+    my ($resource, $part, $params) = @_;
+    if (!$resource->is_gradable() && !$resource->contains_problem) { return '<td></td>'; }
+    if ($params->{showParts}) { 
+	return '<td></td>';
+    }
+
+    my $td = "<td align='right'>\n";
+    my $endtd = "</td>\n";
+    my @probs;
+
+    if ($resource->contains_problem) {
+	@probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
+    } else {
+	@probs=($resource);
+    }
+    my $return;
+    my %overallstatus;
+    my $totalParts;
+    foreach my $resource (@probs) {
+	# If there is a single part, just show the simple status
+	if ($resource->singlepart()) {
+	    my $status = $resource->simpleStatus(${$resource->parts}[0]);
+	    $overallstatus{$status}++;
+	    $totalParts++;
+	    next;
+	}
+	# Now we can be sure the $part doesn't really matter.
+	my $statusCount = $resource->simpleStatusCount();
+	my @counts;
+	foreach my $status (@statuses) {
+	    # decouple display order from the simpleStatusCount order
+	    my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
+	    if ($statusCount->[$slot]) {
+		$overallstatus{$status}+=$statusCount->[$slot];
+		$totalParts+=$statusCount->[$slot];
+	    }
+	}
+    }
+    $return.= $td . $totalParts . ' parts: ';
+    foreach my $status (@statuses) {
+        if ($overallstatus{$status}) {
+            $return.='<span style="color:' . $statusColors{$status}
+                   . '">' . $overallstatus{$status} . ' '
+                   . $statusStrings{$status} . '</span>';
+        }
+    }
+    $return.= $endtd;
+    return $return;
+}
+
+my @preparedColumns = (\&render_resource, \&render_communication_status,
+                       \&render_quick_status, \&render_long_status,
+		       \&render_parts_summary_status);
+
+sub setDefault {
+    my ($val, $default) = @_;
+    if (!defined($val)) { return $default; }
+    return $val;
+}
+
+sub cmp_title {
+    my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
+    $atitle=~s/^\s*//;
+    $btitle=~s/^\s*//;
+    return $atitle cmp $btitle;
+}
+
+sub render {
+    my $args = shift;
+    &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
+    my $result = '';
+    # Configure the renderer.
+    my $cols = $args->{'cols'};
+    if (!defined($cols)) {
+        # no columns, no nav maps.
+        return '';
+    }
+    my $navmap;
+    if (defined($args->{'navmap'})) {
+        $navmap = $args->{'navmap'};
+    }
+
+    my $r = $args->{'r'};
+    my $queryString = $args->{'queryString'};
+    my $jump = $args->{'jump'};
+    my $here = $args->{'here'};
+    my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
+    my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
+    my $currentJumpDelta = 2; # change this to change how many resources are displayed
+                             # before the current resource when using #current
+
+    # If we were passed 'here' information, we are not rendering
+    # after a folder manipulation, and we were not passed an
+    # iterator, make sure we open the folders to show the "here"
+    # marker
+    my $filterHash = {};
+    # Figure out what we're not displaying
+    foreach my $item (split(/\,/, $env{"form.filter"})) {
+        if ($item) {
+            $filterHash->{$item} = "1";
+        }
+    }
+
+    # Filter: Remember filter function and add our own filter: Refuse
+    # to show hidden resources unless the user can see them.
+    my $userCanSeeHidden = advancedUser();
+    my $filterFunc = setDefault($args->{'filterFunc'},
+                                sub {return 1;});
+    if (!$userCanSeeHidden) {
+        # Without renaming the filterfunc, the server seems to go into
+        # an infinite loop
+        my $oldFilterFunc = $filterFunc;
+        $filterFunc = sub { my $res = shift; return !$res->randomout() &&
+                                ($res->deeplink($args->{'caller'}) ne 'absent') &&
+                                ($res->deeplink($args->{'caller'}) ne 'grades') &&
+                                !$res->deeplinkout() &&
+                                &$oldFilterFunc($res);};
+    }
+
+    my $condition = 0;
+    if ($env{'form.condition'}) {
+        $condition = 1;
+    }
+
+    if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
+        # Step 1: Check to see if we have a navmap
+        if (!defined($navmap)) {
+            $navmap = Apache::lonnavmaps::navmap->new();
+	    if (!defined($navmap)) {
+		# no longer in course
+		return '<span class="LC_error">'.&mt('No course selected').'</span><br />
+                        <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
+	    }
+	}
+
+        # Step two: Locate what kind of here marker is necessary
+        # Determine where the "here" marker is and where the screen jumps to.
+
+        if ($env{'form.postsymb'} ne '') {
+            $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
+        } elsif ($env{'form.postdata'} ne '') {
+            # couldn't find a symb, is there a URL?
+            my $currenturl = $env{'form.postdata'};
+            #$currenturl=~s/^http\:\/\///;
+            #$currenturl=~s/^[^\/]+//;
+            unless ($args->{'caller'} eq 'sequence') {
+                $here = $jump = &Apache::lonnet::symbread($currenturl);
+            }
+	}
+	if (($here eq '') && ($args->{'caller'} ne 'sequence')) {
+	    my $last;
+	    if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
+                    &GDBM_READER(),0640)) {
+		$last=$hash{'last_known'};
+		untie(%hash);
+	    }
+	    if ($last) { $here = $jump = $last; }
+	}
+
+        # Step three: Ensure the folders are open
+        my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
+        my $curRes;
+        my $found = 0;
+        
+        # We only need to do this if we need to open the maps to show the
+        # current position. This will change the counter so we can't count
+        # for the jump marker with this loop.
+        while ($here && ($curRes = $mapIterator->next()) && !$found) {
+            if (ref($curRes) && $curRes->symb() eq $here) {
+                my $mapStack = $mapIterator->getStack();
+                
+                # Ensure the parent maps are open
+                for my $map (@{$mapStack}) {
+                    if ($condition) {
+                        undef $filterHash->{$map->map_pc()};
+                    } else {
+                        $filterHash->{$map->map_pc()} = 1;
+                    }
+                }
+                $found = 1;
+            }
+        }            
+    }        
+
+    if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
+        # If this is a click on a folder or something, we want to preserve the "here"
+        # from the querystring, and get the new "jump" marker
+        $here = $env{'form.here'};
+        $jump = $env{'form.jump'};
+    } 
+    
+    my $it = $args->{'iterator'};
+    if (!defined($it)) {
+        # Construct a default iterator based on $env{'form.'} information
+        
+        # Step 1: Check to see if we have a navmap
+        if (!defined($navmap)) {
+            $navmap = Apache::lonnavmaps::navmap->new();
+            if (!defined($navmap)) {
+                # no longer in course
+                return '<span class="LC_error">'.&mt('No course selected').'</span><br />
+                        <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
+            }
+        }
+
+        # See if we're being passed a specific map
+        if ($args->{'iterator_map'}) {
+            my $map = $args->{'iterator_map'};
+            $map = $navmap->getResourceByUrl($map);
+            if (ref($map)) {
+                my $firstResource = $map->map_start();
+                my $finishResource = $map->map_finish();
+                $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
+            } else {
+                return;
+            }
+        } else {
+            $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition,undef,$args->{'include_top_level_map'});
+        }
+    }
+
+    # (re-)Locate the jump point, if any
+    # Note this does not take filtering or hidden into account... need
+    # to be fixed?
+    my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
+    my $curRes;
+    my $foundJump = 0;
+    my $counter = 0;
+    
+    while (($curRes = $mapIterator->next()) && !$foundJump) {
+        if (ref($curRes)) { $counter++; }
+        
+        if (ref($curRes) && $jump eq $curRes->symb()) {
+            
+            # This is why we have to use the main iterator instead of the
+            # potentially faster DFS: The count has to be the same, so
+            # the order has to be the same, which DFS won't give us.
+            $args->{'currentJumpIndex'} = $counter;
+            $foundJump = 1;
+        }
+    }
+
+    my $showParts = setDefault($args->{'showParts'}, 1);
+    my $condenseParts = setDefault($args->{'condenseParts'}, 1);
+    # keeps track of when the current resource is found,
+    # so we can back up a few and put the anchor above the
+    # current resource
+    my $printKey = $args->{'printKey'};
+    my $printCloseAll = $args->{'printCloseAll'};
+    if (!defined($printCloseAll)) { $printCloseAll = 1; }
+   
+    # Print key?
+    if ($printKey) {
+        $result .= '<table border="0" cellpadding="2" cellspacing="0">';
+        $result.='<tr><td align="right" valign="bottom">Key:&nbsp;&nbsp;</td>';
+	my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
+        if ($navmap->{LAST_CHECK}) {
+            $result .= 
+                '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('New discussion since').' '.
+                strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
+                '</td><td align="center" valign="bottom">&nbsp;&nbsp;'.
+                '<img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').'<p>'.
+                '</td>'; 
+        } else {
+            $result .= '<td align="center" valign="bottom">&nbsp;&nbsp;'.
+                '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
+                '&nbsp;&nbsp;<img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').
+                '</td>'; 
+        }
+
+        $result .= '</tr></table>';
+    }
+
+    if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
+	my ($link,$text);
+        if ($condition) {
+	    $link='navmaps?condition=0&amp;filter=&amp;'.$queryString.
+		'&amp;here='.&escape($here);
+	    $text='Close all folders';
+        } else {
+	    $link='navmaps?condition=1&amp;filter=&amp;'.$queryString.
+		'&amp;here='.&escape($here);
+	    $text='Open all folders';
+        }
+        if ($env{'form.register'}) {
+            $link .= '&amp;register='.$env{'form.register'};
+        }
+	if ($args->{'caller'} eq 'navmapsdisplay') {
+            unless ($args->{'notools'}) {
+                &add_linkitem($args->{'linkitems'},'changefolder',
+                              "location.href='$link'",$text);
+            }
+	} else {
+	    $result.= '<a href="'.$link.'">'.&mt($text).'</a>';
+	}
+        $result .= "\n";
+    }
+
+    # Check for any unread discussions in all resources.
+    if (($args->{'caller'} eq 'navmapsdisplay') && (!$args->{'notools'})) {
+	&add_linkitem($args->{'linkitems'},'clearbubbles',
+		      'document.clearbubbles.submit()',
+		      'Mark all posts read');
+	my $time=time;
+        my $querystr = &HTML::Entities::encode($ENV{'QUERY_STRING'},'<>&"');
+	$result .= (<<END);
+    <form name="clearbubbles" method="post" action="/adm/feedback">
+	<input type="hidden" name="navurl" value="$querystr" />
+	<input type="hidden" name="navtime" value="$time" />
+END
+        if ($env{'form.register'}) {
+            $result .= '<input type="hidden" name="register" value="'.$env{'form.register'}.'" />';
+        }
+        if ($args->{'sort'} eq 'discussion') { 
+	    my $totdisc = 0;
+	    my $haveDisc = '';
+	    my @allres=$navmap->retrieveResources();
+	    foreach my $resource (@allres) {
+		if ($resource->hasDiscussion()) {
+		    $haveDisc .= $resource->wrap_symb().':';
+		    $totdisc ++;
+		}
+	    }
+	    if ($totdisc > 0) {
+		$haveDisc =~ s/:$//;
+		$result .= (<<END);
+	<input type="hidden" name="navmaps" value="$haveDisc" />
+    </form>
+END
+            }
+	}
+	$result.='</form>';
+    }
+    if (($args->{'caller'} eq 'navmapsdisplay') &&
+        ((&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) ||
+         (&Apache::lonnet::allowed('cev',$env{'request.course.id'})))) {
+        my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+        my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+        if ($env{'course.'.$env{'request.course.id'}.'.url'} eq 
+            "uploaded/$cdom/$cnum/default.sequence") {
+            &add_linkitem($args->{'linkitems'},'edittoplevel',
+                          "javascript:gocmd('/adm/coursedocs','editdocs');",
+                          'Content Editor');
+        }
+    }
+
+    if ($args->{'caller'} eq 'navmapsdisplay') {
+        $result .= &show_linkitems_toolbar($args,$condition);
+    } elsif ($args->{'sort_html'}) { 
+        $result.=$args->{'sort_html'}; 
+    }
+
+    #$result .= "<br />\n";
+    if ($r) {
+        $r->print($result);
+        $r->rflush();
+        $result = "";
+    }
+    # End parameter setting
+    
+    $result .= "<br />\n";
+
+    # Data
+    $result.=&Apache::loncommon::start_data_table("LC_tableOfContent");    
+
+    my $res = "Apache::lonnavmaps::resource";
+    my %condenseStatuses =
+        ( $res->NETWORK_FAILURE    => 1,
+          $res->NOTHING_SET        => 1,
+          $res->CORRECT            => 1 );
+
+    # Shared variables
+    $args->{'counter'} = 0; # counts the rows
+    $args->{'indentLevel'} = 0;
+    $args->{'isNewBranch'} = 0;
+    $args->{'condensed'} = 0;   
+
+    my $location = &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace_21.gif");
+    $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' alt='' />");
+    $args->{'displayedHereMarker'} = 0;
+
+    # If we're suppressing empty sequences, look for them here.
+    # We also do this even if $args->{'suppressEmptySequences'}
+    # is not true, so we can hide empty sequences for which the
+    # hiddenresource parameter is set to yes (at map level), or
+    # mark as hidden for users who have $userCanSeeHidden.  
+    # Use DFS for speed, since structure actually doesn't matter,
+    # except what map has what resources.
+
+    my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
+                                                     $it->{FIRST_RESOURCE},
+                                                     $it->{FINISH_RESOURCE},
+                                                     {}, undef, 1);
+    my $depth = 0;
+    $dfsit->next();
+    my $curRes = $dfsit->next();
+    while ($depth > -1) {
+        if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
+        if ($curRes == $dfsit->END_MAP()) { $depth--; }
+
+        if (ref($curRes)) { 
+            # Parallel pre-processing: Do sequences have non-filtered-out children?
+            if ($curRes->is_map()) {
+                $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
+                # Sequences themselves do not count as visible children,
+                # unless those sequences also have visible children.
+                # This means if a sequence appears, there's a "promise"
+                # that there's something under it if you open it, somewhere.
+            } elsif ($curRes->src()) {
+                # Not a sequence: if it's filtered, ignore it, otherwise
+                # rise up the stack and mark the sequences as having children
+                if (&$filterFunc($curRes)) {
+                    for my $sequence (@{$dfsit->getStack()}) {
+                        $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
+                    }
+                }
+            }
+        }
+    } continue {
+        $curRes = $dfsit->next();
+    }
+
+    my $displayedJumpMarker = 0;
+    # Set up iteration.
+    my $now = time();
+    my $in24Hours = $now + 24 * 60 * 60;
+    my $rownum = 0;
+
+    # export "here" marker information
+    $args->{'here'} = $here;
+
+    $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
+    my @resources;
+    my $code='';# sub { !(shift->is_map();) };
+    if ($args->{'sort'} eq 'title') {
+        my $oldFilterFunc = $filterFunc;
+	my $filterFunc= 
+	    sub {
+		my ($res)=@_;
+		if ($res->is_map()) { return 0;}
+		return &$oldFilterFunc($res);
+	    };
+	@resources=$navmap->retrieveResources(undef,$filterFunc);
+	@resources= sort { &cmp_title($a,$b) } @resources;
+    } elsif ($args->{'sort'} eq 'duedate') {
+	my $oldFilterFunc = $filterFunc;
+	my $filterFunc= 
+	    sub {
+		my ($res)=@_;
+		if (!$res->is_problem()) { return 0;}
+		return &$oldFilterFunc($res);
+	    };
+	@resources=$navmap->retrieveResources(undef,$filterFunc);
+	@resources= sort {
+	    if ($a->duedate ne $b->duedate) {
+	        return $a->duedate cmp $b->duedate;
+	    }
+	    my $value=&cmp_title($a,$b);
+	    return $value;
+	} @resources;
+    } elsif ($args->{'sort'} eq 'discussion') {
+	my $oldFilterFunc = $filterFunc;
+	my $filterFunc= 
+	    sub {
+		my ($res)=@_;
+		if (!$res->hasDiscussion() &&
+		    !$res->getFeedback() &&
+		    !$res->getErrors()) { return 0;}
+		return &$oldFilterFunc($res);
+	    };
+	@resources=$navmap->retrieveResources(undef,$filterFunc);
+	@resources= sort { &cmp_title($a,$b) } @resources;
+    } else {
+	#unknow sort mechanism or default
+	undef($args->{'sort'});
+    }
+
+    # Determine if page will be served with https in case
+    # it contains a syllabus which uses an external URL
+    # which points at an http site.
+
+    my ($is_ssl,$cdom,$cnum,$hostname);
+    if ($ENV{'SERVER_PORT'} == 443) {
+        $is_ssl = 1;
+        if ($r) {
+            $hostname = $r->hostname();
+        } else {
+            $hostname = $ENV{'SERVER_NAME'};
+        }
+    }
+    if ($env{'request.course.id'}) {
+        $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+        $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+    }
+
+    my $inhibitmenu;
+    if ($args->{'modalLink'}) {
+        $inhibitmenu = '&amp;inhibitmenu=yes';
+    }
+
+    while (1) {
+	if ($args->{'sort'}) {
+	    $curRes = shift(@resources);
+	} else {
+	    $curRes = $it->next($closeAllPages);
+	}
+	if (!$curRes) { last; }
+
+        # Maintain indentation level.
+        if ($curRes == $it->BEGIN_MAP() ||
+            $curRes == $it->BEGIN_BRANCH() ) {
+            $args->{'indentLevel'}++;
+        }
+        if ($curRes == $it->END_MAP() ||
+            $curRes == $it->END_BRANCH() ) {
+            $args->{'indentLevel'}--;
+        }
+        # Notice new branches
+        if ($curRes == $it->BEGIN_BRANCH()) {
+            $args->{'isNewBranch'} = 1;
+        }
+
+        # If this isn't an actual resource, continue on
+        if (!ref($curRes)) {
+            next;
+        }
+
+        # If this has been filtered out, continue on
+        if (!(&$filterFunc($curRes))) {
+            $args->{'isNewBranch'} = 0; # Don't falsely remember this
+            next;
+        } 
+
+        # If this is an empty sequence and we're filtering them, continue on
+        $args->{'mapHidden'} = 0;
+        $args->{'mapUnlisted'} = 0;
+        $args->{'mapHiddenDeepLink'} = 0;
+        if (($curRes->is_map()) && (!$curRes->{DATA}->{HAS_VISIBLE_CHILDREN})) {
+            if ($args->{'suppressEmptySequences'}) {
+                next;
+            } else {
+                my $mapname = &Apache::lonnet::declutter($curRes->src());
+                $mapname = &Apache::lonnet::deversion($mapname); 
+                if (lc($navmap->get_mapparam(undef,$mapname,"0.hiddenresource")) eq 'yes') {
+                    if ($userCanSeeHidden) {
+                        $args->{'mapHidden'} = 1;
+                    } else {
+                        next;
+                    }
+                } elsif ($curRes->deeplinkout) {
+                    if ($userCanSeeHidden) {
+                        $args->{'mapHiddenDeepLink'} = 1;
+                    } else {
+                        next;
+                    }
+                } else {
+                    my $deeplink = $navmap->get_mapparam(undef,$mapname,"0.deeplink");
+                    my ($state,$others,$listed) = split(/,/,$deeplink);
+                    if (($listed eq 'absent') || ($listed eq 'grades')) {
+                        if ($userCanSeeHidden) {
+                            $args->{'mapUnlisted'} = 1;
+                        } else {
+                            next;
+                        }
+                    }
+                }
+            }
+        }
+
+        # If we're suppressing navmaps and this is a navmap, continue on
+        if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
+            next;
+        }
+
+        $args->{'counter'}++;
+
+        # Does it have multiple parts?
+        $args->{'multipart'} = 0;
+        $args->{'condensed'} = 0;
+        my @parts;
+            
+        # Decide what parts to show.
+        if ($curRes->is_problem() && $showParts) {
+            @parts = @{$curRes->parts()};
+            $args->{'multipart'} = $curRes->multipart();
+            
+            if ($condenseParts) { # do the condensation
+                if (!$args->{'condensed'}) {
+                    # Decide whether to condense based on similarity
+                    my $status = $curRes->status($parts[0]);
+                    my $due = $curRes->duedate($parts[0]);
+                    my $open = $curRes->opendate($parts[0]);
+                    my $statusAllSame = 1;
+                    my $dueAllSame = 1;
+                    my $openAllSame = 1;
+                    for (my $i = 1; $i < scalar(@parts); $i++) {
+                        if ($curRes->status($parts[$i]) != $status){
+                            $statusAllSame = 0;
+                        }
+                        if ($curRes->duedate($parts[$i]) != $due ) {
+                            $dueAllSame = 0;
+                        }
+                        if ($curRes->opendate($parts[$i]) != $open) {
+                            $openAllSame = 0;
+                        }
+                    }
+                    # $*allSame is true if all the statuses were
+                    # the same. Now, if they are all the same and
+                    # match one of the statuses to condense, or they
+                    # are all open with the same due date, or they are
+                    # all OPEN_LATER with the same open date, display the
+                    # status of the first non-zero part (to get the 'correct'
+                    # status right, since 0 is never 'correct' or 'open').
+                    if (($statusAllSame && defined($condenseStatuses{$status})) ||
+                        ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
+                        ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
+                        @parts = ($parts[0]);
+                        $args->{'condensed'} = 1;
+                    }
+                }
+		# Multipart problem with one part: always "condense" (happens
+		#  to match the desirable behavior)
+		if ($curRes->countParts() == 1) {
+		    @parts = ($parts[0]);
+		    $args->{'condensed'} = 1;
+		}
+            }
+        }
+        # If deep-link parameter is set (and is not set to full) suppress link
+        # unless privileged user, tinyurl used for login resolved to a map, and
+        # the resource is within the map.
+        if ((!$curRes->deeplink($args->{'caller'})) ||
+            ($curRes->deeplink($args->{'caller'}) eq 'full') || &advancedUser()) {
+            $args->{'resource_nolink'} = 0;
+        } else {
+            $args->{'resource_nolink'} = 1;
+        }
+
+        # If the multipart problem was condensed, "forget" it was multipart
+        if (scalar(@parts) == 1) {
+            $args->{'multipart'} = 0;
+        } else {
+            # Add part 0 so we display it correctly.
+            unshift @parts, '0';
+        }
+	
+	{
+	    my ($src,$symb,$anchor,$stack);
+	    if ($args->{'sort'}) {
+		my $it = $navmap->getIterator(undef, undef, undef, 1);
+		while ( my $res=$it->next()) {
+		    if (ref($res) &&
+			$res->symb() eq  $curRes->symb()) { last; }
+		}
+		$stack=$it->getStack();
+	    } else {
+		$stack=$it->getStack();
+	    }
+	    ($src,$symb,$anchor)=getLinkForResource($stack);
+            my $srcHasQuestion = $src =~ /\?/;
+            if ($env{'request.course.id'}) {
+                if (($is_ssl) && ($src =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) &&
+                    ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
+                    unless ((&Apache::lonnet::uses_sts()) || (&Apache::lonnet::waf_allssl($hostname))) {
+                        if ($hostname ne '') {
+                            $src = 'http://'.$hostname.$src;
+                        }
+                        $src .= ($srcHasQuestion? '&amp;' : '?') . 'usehttp=1';
+                        $srcHasQuestion = 1;
+                    }
+                } elsif (($is_ssl) && ($src =~ m{^\Q/adm/wrapper/ext/\E(?!https:)})) {
+                    unless ((&Apache::lonnet::uses_sts()) || (&Apache::lonnet::waf_allssl($hostname))) {
+                        if ($hostname ne '') {
+                            $src = 'http://'.$hostname.$src;
+                        }
+                        $src .= ($srcHasQuestion? '&amp;' : '?') . 'usehttp=1';
+                        $srcHasQuestion = 1;
+                    }
+                }
+            }
+	    if (defined($anchor)) { $anchor='#'.$anchor; }
+	    if (($args->{'caller'} eq 'sequence') && ($curRes->is_map())) {
+	        $args->{"resourceLink"} = $src.($srcHasQuestion?'&amp;':'?') .'navmap=1';
+	    } else {
+	        $args->{"resourceLink"} = $src.
+		    ($srcHasQuestion?'&amp;':'?') .
+		    'symb=' . &escape($symb).$inhibitmenu.$anchor;
+	    }
+	}
+        # Now, we've decided what parts to show. Loop through them and
+        # show them.
+        foreach my $part (@parts) {
+            $rownum ++;
+            
+            $result .= &Apache::loncommon::start_data_table_row();
+
+            # Set up some data about the parts that the cols might want
+            my $filter = $it->{FILTER};
+
+            # Now, display each column.
+            foreach my $col (@$cols) {
+                my $colHTML = '';
+                if (ref($col)) {
+                    $colHTML .= &$col($curRes, $part, $args);
+                } else {
+                    $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
+                }
+
+                # If this is the first column and it's time to print
+                # the anchor, do so
+                if ($col == $cols->[0] && 
+                    $args->{'counter'} == $args->{'currentJumpIndex'} - 
+                    $currentJumpDelta) {
+                    # Jam the anchor after the <td> tag;
+                    # necessary for valid HTML (which Mozilla requires)
+                    $colHTML =~ s/\>/\>\<a name="curloc" \>\<\/a\>/;
+                    $displayedJumpMarker = 1;
+                }
+                $result .= $colHTML . "\n";
+            }
+            $result .= &Apache::loncommon::end_data_table_row();
+            $args->{'isNewBranch'} = 0;
+        }
+
+        if ($r && $rownum % 20 == 0) {
+            $r->print($result);
+            $result = "";
+            $r->rflush();
+        }
+    } continue {
+	if ($r) {
+	    # If we have the connection, make sure the user is still connected
+	    my $c = $r->connection;
+	    if ($c->aborted()) {
+		# Who cares what we do, nobody will see it anyhow.
+		return '';
+	    }
+	}
+    }
+
+    $result.=&Apache::loncommon::end_data_table();
+    
+    # Print out the part that jumps to #curloc if it exists
+    # delay needed because the browser is processing the jump before
+    # it finishes rendering, so it goes to the wrong place!
+    # onload might be better, but this routine has no access to that.
+    # On mozilla, the 0-millisecond timeout seems to prevent this;
+    # it's quite likely this might fix other browsers, too, and 
+    # certainly won't hurt anything.
+    if ($displayedJumpMarker) {
+        $result .= &Apache::lonhtmlcommon::scripttag("
+if (location.href.indexOf('#curloc')==-1) {
+    setTimeout(\"location += '#curloc';\", 0)
+}
+");
+    }
+
+    if ($r) {
+        $r->print($result);
+        $result = "";
+        $r->rflush();
+    }
+        
+    return $result;
+}
+
+sub add_linkitem {
+    my ($linkitems,$name,$cmd,$text)=@_;
+    $$linkitems{$name}{'cmd'}=$cmd;
+    $$linkitems{$name}{'text'}=&mt($text);
+}
+
+sub show_linkitems_toolbar {
+    my ($args,$condition) = @_;
+    my $result;
+    if (ref($args) eq 'HASH') {
+        if (ref($args->{'linkitems'}) eq 'HASH') {
+            my $numlinks = scalar(keys(%{$args->{'linkitems'}}));
+            if ($numlinks > 1) {
+                $result = '<td>'.
+                          &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',
+                                                             undef,'RAT').
+                          '</td>'.
+                          '<td>&nbsp;</td>'.
+                          '<td class="LC_middle">'.&mt('Tools:').'</td>';
+            }
+            $result .= '<td align="left">'."\n".
+                       '<ul id="LC_toolbar">';
+            my @linkorder = ('firsthomework','everything','uncompleted',
+                             'changefolder','clearbubbles','edittoplevel');
+            foreach my $link (@linkorder) {
+                if (ref($args->{'linkitems'}{$link}) eq 'HASH') {
+                    if ($args->{'linkitems'}{$link}{'text'} ne '') {
+                        $args->{'linkitems'}{$link}{'cmd'}=~s/"/'/g;
+                        if ($args->{'linkitems'}{$link}{'cmd'}) {
+                            my $link_id = 'LC_content_toolbar_'.$link;
+                            if ($link eq 'changefolder') {
+                                if ($condition) {
+                                    $link_id='LC_content_toolbar_changefolder_toggled';
+                                } else {
+                                    $link_id='LC_content_toolbar_changefolder';
+                                }
+                            }
+                            $result .= '<li><a href="#" '.
+                                       'onclick="'.$args->{'linkitems'}{$link}{'cmd'}.'" '.
+                                       'id="'.$link_id.'" '.
+                                       'class="LC_toolbarItem" '.
+                                       'title="'.$args->{'linkitems'}{$link}{'text'}.'">'.
+                                       '</a></li>'."\n";
+                        }
+                    }
+                }
+            }
+            $result .= '</ul>'.
+                       '</td>';
+            if (($numlinks==1) && (exists($args->{'linkitems'}{'edittoplevel'}))) {
+                $result .= '<td><a href="'.$args->{'linkitems'}{'edittoplevel'}{'cmd'}.'">'.
+                           &mt('Content Editor').'</a></td>';
+            }
+        }
+        if ($args->{'sort_html'}) {
+            $result .= '<td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td>'.
+                       '<td align="right">'.$args->{'sort_html'}.'</td>';
+        }
+    }
+    if ($result) {
+        $result = "<table><tr>$result</tr></table>";
+    }
+    return $result;
+}
+
 1;
 
+
+
+
+
+
+
+
+
 package Apache::lonnavmaps::navmap;
 
 =pod
 
-lonnavmaps provides functions and objects for dealing with the compiled course hashes generated when a user enters the course, and also provides the Apache handler for the "Navigation Map" button.
+=head1 Object: Apache::lonnavmaps::navmap
+
+=head2 Overview
+
+The navmap object's job is to provide access to the resources
+in the course as Apache::lonnavmaps::resource objects, and to
+query and manage the relationship between those resource objects.
+
+Generally, you'll use the navmap object in one of three basic ways.
+In order of increasing complexity and power:
+
+=over 4
+
+=item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
+    various ways to obtain resource objects, based on various identifiers.
+    Use this when you want to request information about one object or 
+    a handful of resources you already know the identities of, from some
+    other source. For more about Ids, Symbs, and MapPcs, see the
+    Resource documentation. Note that Url should be a B<last resort>,
+    not your first choice; it only really works when there is only one
+    instance of the resource in the course, which only applies to
+    maps, and even that may change in the future (see the B<getResourceByUrl>
+    documentation for more details.)
+
+=item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
+    retrieves resources matching some criterion and returns them
+    in a flat array, with no structure information. Use this when
+    you are manipulating a series of resources, based on what map
+    the are in, but do not care about branching, or exactly how
+    the maps and resources are related. This is the most common case.
+
+=item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
+    the course's navmap in various ways without writing the traversal
+    code yourself. See iterator documentation below. Use this when
+    you need to know absolutely everything about the course, including
+    branches and the precise relationship between maps and resources.
 
-=head1 navmap object: Encapsulating the compiled nav map
+=back
+
+=head2 Creation And Destruction
+
+To create a navmap object, use the following function:
 
-navmap is an object that encapsulates a compiled course map and provides a reasonable interface to it.
+=over 4
+
+=item * B<Apache::lonnavmaps::navmap-E<gt>new>():
 
-Most notably it provides a way to navigate the map sensibly and a flexible iterator that makes it easy to write various renderers based on nav maps.
+Creates a new navmap object. Returns the navmap object if this is
+successful, or B<undef> if not.
 
-You must obtain resource objects through the navmap object.
+=back
 
 =head2 Methods
 
 =over 4
 
-=item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions, genMailDiscussStatus): Binds a new navmap object to the compiled nav map hash and parm hash given as filenames. genCourseAndUserOptions is a flag saying whether the course options and user options hash should be generated. This is for when you are using the parameters of the resources that require them; see documentation in resource object documentation. genMailDiscussStatus causes the nav map to retreive information about the email and discussion status of resources. Returns the navmap object if this is successful, or B<undef> if not. You must check for undef; errors will occur when you try to use the other methods otherwise.
+=item * B<getIterator>(first, finish, filter, condition):
 
-=item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.
+See iterator documentation below.
 
 =cut
 
 use strict;
 use GDBM_File;
+use Apache::lonnet;
+use LONCAPA;
 
 sub new {
     # magic invocation to create a class instance
     my $proto = shift;
     my $class = ref($proto) || $proto;
     my $self = {};
+    bless($self);		# So we can call change_user if necessary
+
+    $self->{USERNAME} = shift || $env{'user.name'};
+    $self->{DOMAIN}   = shift || $env{'user.domain'};
+    $self->{CODE}     = shift;
+    $self->{NOHIDE} = shift;
+
 
-    $self->{NAV_HASH_FILE} = shift;
-    $self->{PARM_HASH_FILE} = shift;
-    $self->{GENERATE_COURSE_USER_OPT} = shift;
-    $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
 
     # Resource cache stores navmap resources as we reference them. We generate
     # them on-demand so we don't pay for creating resources unless we use them.
@@ -966,143 +2235,244 @@ sub new {
     # failed
     $self->{NETWORK_FAILURE} = 0;
 
-    # tie the nav hash
-    my %navmaphash;
-    if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
-              &GDBM_READER(), 0640))) {
-        return undef;
+    # We can only tie the nav hash as done below if the username/domain
+    # match the env one. Otherwise change_user does everything we need...since we can't
+    # assume there are course hashes for the specific requested user:domain
+    # Note: change_user is also called if we need the nav hash when printing CODEd 
+    # assignments or printing an exam, in which the enclosing folder for the items in
+    # the exam has hidden set.
+    #
+
+    if (($self->{USERNAME} eq $env{'user.name'}) && ($self->{DOMAIN} eq $env{'user.domain'}) &&
+         !$self->{CODE} && !$self->{NOHIDE}) {
+	
+	# tie the nav hash
+	
+	my %navmaphash;
+	my %parmhash;
+	my $courseFn = $env{"request.course.fn"};
+	if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
+		  &GDBM_READER(), 0640))) {
+	    return undef;
+	}
+	
+	if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
+		  &GDBM_READER(), 0640)))
+	{
+	    untie %{$self->{PARM_HASH}};
+	    return undef;
+	}
+	
+	$self->{NAV_HASH} = \%navmaphash;
+	$self->{PARM_HASH} = \%parmhash;
+	$self->{PARM_CACHE} = {};
+    } else {
+	$self->change_user($self->{USERNAME}, $self->{DOMAIN},  $self->{CODE}, $self->{NOHIDE});
     }
+
+    return $self;
+}
+
+#
+#  In some instances it is useful to be able to dynamically change the
+# username/domain associated with a navmap (e.g. to navigate for someone
+# else besides the current user...if sufficiently privileged.
+# Parameters:
+#    user  - New user.
+#    domain- Domain the user belongs to.
+#    code  - Anonymous CODE in use.
+# Implicit inputs:
+#   
+sub change_user {
+    my $self = shift;
+    $self->{USERNAME} = shift;
+    $self->{DOMAIN}   = shift;
+    $self->{CODE}     = shift;
+    $self->{NOHIDE}   = shift;
+
+    # If the hashes are already tied make sure to break that bond:
+
+    untie %{$self->{NAV_HASH}}; 
+    untie %{$self->{PARM_HASH}};
+
+    # The assumption is that we have to
+    # use lonmap here to re-read the hash and from it reconstruct
+    # new big and parameter hashes.  An implicit assumption at this time
+    # is that the course file is probably not created locally yet
+    # an that we will therefore just read without tying.
+
+    my ($cdom, $cnum) = split(/\_/, $env{'request.course.id'});
+
+    my %big_hash;
+    &Apache::lonmap::loadmap($cnum, $cdom, $self->{USERNAME}, $self->{DOMAIN}, $self->{CODE}, $self->{NOHIDE}, \%big_hash);
+    $self->{NAV_HASH} = \%big_hash;
+
+
+
+    # Now clear the parm cache and reconstruct the parm hash from the big_hash
+    # param.xxxx keys.
+
+    $self->{PARM_CACHE} = {};
     
-    my %parmhash;
-    if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
-              &GDBM_READER(), 0640)))
-    {
-        untie $self->{PARM_HASH};
-        return undef;
+    my %parm_hash = {};
+    foreach my $key (keys(%big_hash)) {
+	if ($key =~ /^param\./) {
+	    my $param_key = $key;
+	    $param_key =~ s/^param\.//;
+	    $parm_hash{$param_key} = $big_hash{$key};
+	}
     }
 
-    # Now copy the hashes for speed (?)
-    my %realnav; my %realparm;
-    foreach (%navmaphash) { $realnav{$_} = $navmaphash{$_}; }
-    foreach (%parmhash) { $realparm{$_} = $navmaphash{$_}; }
-    $self->{NAV_HASH} = \%realnav;
-    $self->{PARM_HASH} = \%realparm;
+    $self->{PARM_HASH} = \%parm_hash;
 
-    bless($self);
-    $self->untieHashes();
-        
-    return $self;
 }
 
-sub init {
+sub generate_course_user_opt {
     my $self = shift;
+    if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
 
-    # If the course opt hash and the user opt hash should be generated,
-    # generate them
-    if ($self->{GENERATE_COURSE_USER_OPT}) {
-        my $uname=$ENV{'user.name'};
-        my $udom=$ENV{'user.domain'};
-        my $uhome=$ENV{'user.home'};
-        my $cid=$ENV{'request.course.id'};
-        my $chome=$ENV{'course.'.$cid.'.home'};
-        my ($cdom,$cnum)=split(/\_/,$cid);
-        
-        my $userprefix=$uname.'_'.$udom.'_';
-        
-        my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
-        unless ($uhome eq 'no_host') { 
+    my $uname=$self->{USERNAME};
+    my $udom=$self->{DOMAIN};
+
+    my $cid=$env{'request.course.id'};
+    my $cdom=$env{'course.'.$cid.'.domain'};
+    my $cnum=$env{'course.'.$cid.'.num'};
+    
 # ------------------------------------------------- Get coursedata (if present)
-            unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
-                my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
-                                                 ':resourcedata',$chome);
-                if ($reply!~/^error\:/) {
-                    $courserdatas{$cid}=$reply;
-                    $courserdatas{$cid.'.last_cache'}=time;
-                }
-                # check to see if network failed
-                elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
-                {
-                    $self->{NETWORK_FAILURE} = 1;
-                }
-            }
-            foreach (split(/\&/,$courserdatas{$cid})) {
-                my ($name,$value)=split(/\=/,$_);
-                $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
-                    &Apache::lonnet::unescape($value);
-            }
+    my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
+    # Check for network failure
+    if (!ref($courseopt)) {
+	if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
+	    $self->{NETWORK_FAILURE} = 1;
+	}
+	undef($courseopt);
+    }
+
 # --------------------------------------------------- Get userdata (if present)
-            unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
-                my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
-                if ($reply!~/^error\:/) {
-                    $userrdatas{$uname.'___'.$udom}=$reply;
-                    $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
-                }
-                # check to see if network failed
-                elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
-                {
-                    $self->{NETWORK_FAILURE} = 1;
-                }
-            }
-            foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
-                my ($name,$value)=split(/\=/,$_);
-                $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
-                    &Apache::lonnet::unescape($value);
-            }
-            $self->{COURSE_OPT} = \%courseopt;
-            $self->{USER_OPT} = \%useropt;
-        }
-    }   
-
-    if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
-        my $cid=$ENV{'request.course.id'};
-        my ($cdom,$cnum)=split(/\_/,$cid);
-        
-        my %emailstatus = &Apache::lonnet::dump('email_status');
-        my $logoutTime = $emailstatus{'logout'};
-        my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
-        $self->{LAST_CHECK} = ($courseLeaveTime > $logoutTime ?
-                               $courseLeaveTime : $logoutTime);
-        my %discussiontime = &Apache::lonnet::dump('discussiontimes', 
-                                                   $cdom, $cnum);
-        my %feedback=();
-        my %error=();
-        my $keys = &Apache::lonnet::reply('keys:'.
-                                          $ENV{'user.domain'}.':'.
-                                          $ENV{'user.name'}.':nohist_email',
-                                          $ENV{'user.home'});
-
-        foreach my $msgid (split(/\&/, $keys)) {
-            $msgid=&Apache::lonnet::unescape($msgid);
-            my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
-            if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
-                my ($what,$url)=($1,$2);
-                my %status=
-                    &Apache::lonnet::get('email_status',[$msgid]);
-                if ($status{$msgid}=~/^error\:/) { 
-                    $status{$msgid}=''; 
+	
+    my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
+    # Check for network failure
+    if (!ref($useropt)) {
+	if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
+	    $self->{NETWORK_FAILURE} = 1;
+	}
+	undef($useropt);
+    }
+
+    $self->{COURSE_OPT} = $courseopt;
+    $self->{USER_OPT} = $useropt;
+
+    $self->{COURSE_USER_OPT_GENERATED} = 1;
+    
+    return;
+}
+
+
+
+sub generate_email_discuss_status {
+    my $self = shift;
+    my $symb = shift;
+    if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
+
+    my $cid=$env{'request.course.id'};
+    my $cdom=$env{'course.'.$cid.'.domain'};
+    my $cnum=$env{'course.'.$cid.'.num'};
+    
+    my %emailstatus = &Apache::lonnet::dump('email_status',$self->{DOMAIN},$self->{USERNAME});
+    my $logoutTime = $emailstatus{'logout'};
+    my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
+    $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
+			   $courseLeaveTime : $logoutTime);
+    my %discussiontime = &Apache::lonnet::dump('discussiontimes', 
+					       $cdom, $cnum);
+    my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
+                                        $self->{DOMAIN},$self->{USERNAME},'lastread');
+    my %lastreadtime = ();
+    foreach my $key (keys(%lastread)) {
+        my $shortkey = $key;
+        $shortkey =~ s/_lastread$//;
+        $lastreadtime{$shortkey} = $lastread{$key};
+    }
+
+    my %feedback=();
+    my %error=();
+    my @keys = &Apache::lonnet::getkeys('nohist_email',$self->{DOMAIN},
+					$self->{USERNAME});
+    
+    foreach my $msgid (@keys) {
+	if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
+            my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
+                $symb,$error) = &Apache::lonmsg::unpackmsgid(&LONCAPA::escape($msgid));
+            &Apache::lonenc::check_decrypt(\$symb); 
+            if (($fromcid ne '') && ($fromcid ne $cid)) {
+                next;
+            }
+            if (defined($symb)) {
+                if (defined($error) && $error == 1) {
+                    $error{$symb}.=','.$msgid;
+                } else {
+                    $feedback{$symb}.=','.$msgid;
                 }
-                
-                if (($status{$msgid} eq 'new') || 
-                    (!$status{$msgid})) { 
-                    if ($what eq 'Error') {
-                        $error{$url}.=','.$msgid; 
+            } else {
+                my $plain=
+                    &LONCAPA::unescape(&LONCAPA::unescape($msgid));
+                if ($plain=~/ \[([^\]]+)\]\:/) {
+                    my $url=$1;
+                    if ($plain=~/\:Error \[/) {
+                        $error{$url}.=','.$msgid;
                     } else {
                         $feedback{$url}.=','.$msgid;
                     }
                 }
             }
-        }
-        
-        $self->{FEEDBACK} = \%feedback;
-        $self->{ERROR_MSG} = \%error; # what is this? JB
-        $self->{DISCUSSION_TIME} = \%discussiontime;
-        $self->{EMAIL_STATUS} = \%emailstatus;
-        
-    }    
+	}
+    }
+    
+    #symbs of resources that have feedbacks (will be urls pre-2.3)
+    $self->{FEEDBACK} = \%feedback;
+    #or errors (will be urls pre 2.3)
+    $self->{ERROR_MSG} = \%error;
+    $self->{DISCUSSION_TIME} = \%discussiontime;
+    $self->{EMAIL_STATUS} = \%emailstatus;
+    $self->{LAST_READ} = \%lastreadtime;
+    
+    $self->{EMAIL_DISCUSS_GENERATED} = 1;
+}
 
-    $self->{PARM_CACHE} = {};
+sub get_user_data {
+    my $self = shift;
+    if ($self->{RETRIEVED_USER_DATA}) { return; }
+
+    # Retrieve performance data on problems
+    my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
+						   $self->{DOMAIN},
+						   $self->{USERNAME});
+    $self->{STUDENT_DATA} = \%student_data;
+
+    $self->{RETRIEVED_USER_DATA} = 1;
 }
 
+sub get_discussion_data {
+    my $self = shift;
+    if ($self->{RETRIEVED_DISCUSSION_DATA}) {
+	return $self->{DISCUSSION_DATA};
+    }
+
+    $self->generate_email_discuss_status();    
+
+    my $cid=$env{'request.course.id'};
+    my $cdom=$env{'course.'.$cid.'.domain'};
+    my $cnum=$env{'course.'.$cid.'.num'};
+    # Retrieve discussion data for resources in course
+    my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
+
+
+    $self->{DISCUSSION_DATA} = \%discussion_data;
+    $self->{RETRIEVED_DISCUSSION_DATA} = 1;
+    return $self->{DISCUSSION_DATA};
+}
+
+
 # Internal function: Takes a key to look up in the nav hash and implements internal
 # memory caching of that key.
 sub navhash {
@@ -1110,10 +2480,19 @@ sub navhash {
     return $self->{NAV_HASH}->{$key};
 }
 
+=pod
+
+=item * B<courseMapDefined>(): Returns true if the course map is defined, 
+    false otherwise. Undefined course maps indicate an error somewhere in
+    LON-CAPA, and you will not be able to proceed with using the navmap.
+    See the B<NAV> screen for an example of using this.
+
+=cut
+
 # Checks to see if coursemap is defined, matching test in old lonnavmaps
 sub courseMapDefined {
     my $self = shift;
-    my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
+    my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
 
     my $firstres = $self->navhash("map_start_$uri");
     my $lastres = $self->navhash("map_finish_$uri");
@@ -1123,57 +2502,189 @@ sub courseMapDefined {
 sub getIterator {
     my $self = shift;
     my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
-                                                     shift, undef, shift);
+                                                     shift, undef, shift,
+						     shift, shift, shift);
     return $iterator;
 }
 
-# unties the hash when done
-sub untieHashes {
+# Private method: Does the given resource (as a symb string) have
+# current discussion? Returns 0 if chat/mail data not extracted.
+sub hasDiscussion {
     my $self = shift;
-    untie %{$self->{NAV_HASH}} if ($self->{HASH_TIED});
-    untie %{$self->{PARM_HASH}} if ($self->{HASH_TIED});
-    $self->{HASH_TIED} = 0;
+    my $symb = shift;
+    $self->generate_email_discuss_status();
+
+    if (!defined($self->{DISCUSSION_TIME})) { return 0; }
+
+    #return defined($self->{DISCUSSION_TIME}->{$symb});
+
+    # backward compatibility (bulletin boards used to be 'wrapped')
+    my $ressymb = $self->wrap_symb($symb);
+    if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
+        return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
+    } else {
+#        return $self->{DISCUSSION_TIME}->{$ressymb} >  $self->{LAST_CHECK}; # v.1.1 behavior 
+        return $self->{DISCUSSION_TIME}->{$ressymb} >  0; # in 1.2 will display speech bubble icons for all items with posts until marked as read (even if read in v 1.1).
+    }
 }
 
-# when the object is destroyed, be sure to untie all the hashes we tied.
-sub DESTROY {
+sub last_post_time {
     my $self = shift;
-    $self->untieHashes();
+    my $symb = shift;
+    my $ressymb = $self->wrap_symb($symb);
+    return $self->{DISCUSSION_TIME}->{$ressymb};
 }
 
-# Private function: Does the given resource (as a symb string) have
-# current discussion? Returns 0 if chat/mail data not extracted.
-sub hasDiscussion {
+sub discussion_info {
     my $self = shift;
     my $symb = shift;
-    if (!defined($self->{DISCUSSION_TIME})) { return 0; }
+    my $filter = shift;
 
-    return $self->{DISCUSSION_TIME}->{$symb} >
-           $self->{LAST_CHECK};
+    $self->get_discussion_data();
+
+    my $ressymb = $self->wrap_symb($symb);
+    # keys used to store bulletinboard postings use 'unwrapped' symb. 
+    my $discsymb = &escape($self->unwrap_symb($ressymb));
+    my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
+    if (!$version) { return; }
+
+    my $prevread = $self->{LAST_READ}{$ressymb};
+
+    my $count = 0;
+    my $hiddenflag = 0;
+    my $deletedflag = 0;
+    my ($hidden,$deleted,%info);
+
+    for (my $id=$version; $id>0; $id--) {
+	my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
+	my @keys=split(/:/,$vkeys);
+	if (grep(/^hidden$/ ,@keys)) {
+	    if (!$hiddenflag) {
+		$hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
+		$hiddenflag = 1;
+	    }
+	} elsif (grep(/^deleted$/,@keys)) {
+	    if (!$deletedflag) {
+		$deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
+		$deletedflag = 1;
+	    }
+	} else {
+	    if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
+                if ($filter eq 'unread') {
+		    if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
+                        next;
+                    }
+                }
+		$count++;
+		$info{$count}{'subject'} =
+		    $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
+                $info{$count}{'id'} = $id;
+                $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
+            }
+	}
+    }
+    if (wantarray) {
+	return ($count,%info);
+    }
+    return $count;
+}
+
+sub wrap_symb {
+    my $self = shift;
+    my $symb = shift;
+    if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
+        unless ($symb =~ m|adm/wrapper/adm|) {
+            $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
+        }
+    }
+    return $symb;
+}
+
+sub unwrap_symb {
+    my $self = shift;
+    my $ressymb = shift;
+    my $discsymb = $ressymb;
+    if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
+         $discsymb = $1.$2;
+    }
+    return $discsymb;
 }
 
-# Private function: Does the given resource (as a symb string) have
+# Private method: Does the given resource (as a symb string) have
 # current feedback? Returns the string in the feedback hash, which
 # will be false if it does not exist.
+
 sub getFeedback { 
     my $self = shift;
     my $symb = shift;
+    my $source = shift;
+
+    $self->generate_email_discuss_status();
 
     if (!defined($self->{FEEDBACK})) { return ""; }
     
-    return $self->{FEEDBACK}->{$symb};
+    my $feedback;
+    if ($self->{FEEDBACK}->{$symb}) {
+        $feedback = $self->{FEEDBACK}->{$symb};
+        if ($self->{FEEDBACK}->{$source}) {
+            $feedback .= ','.$self->{FEEDBACK}->{$source};
+        }
+    } else {
+        if ($self->{FEEDBACK}->{$source}) {
+            $feedback = $self->{FEEDBACK}->{$source};
+        }
+    }
+    return $feedback;
+}
+
+# Private method: Get the errors for that resource (by source).
+sub getErrors { 
+    my $self = shift;
+    my $symb = shift;
+    my $src = shift;
+
+    $self->generate_email_discuss_status();
+
+    if (!defined($self->{ERROR_MSG})) { return ""; }
+
+    my $errors;
+    if ($self->{ERROR_MSG}->{$symb}) {
+        $errors = $self->{ERROR_MSG}->{$symb};
+        if ($self->{ERROR_MSG}->{$src}) {
+            $errors .= ','.$self->{ERROR_MSG}->{$src};
+        }
+    } else {
+        if ($self->{ERROR_MSG}->{$src}) {
+            $errors = $self->{ERROR_MSG}->{$src};
+        }
+    }
+    return $errors;
 }
 
 =pod
 
-=item * B<getById>(id): Based on the ID of the resource (1.1, 3.2, etc.), get a resource object for that resource. This method, or other methods that use it (as in the resource object) is the only proper way to obtain a resource object.
+=item * B<getById>(id):
+
+Based on the ID of the resource (1.1, 3.2, etc.), get a resource
+object for that resource. This method, or other methods that use it
+(as in the resource object) is the only proper way to obtain a
+resource object.
+
+=item * B<getBySymb>(symb):
+
+Based on the symb of the resource, get a resource object for that
+resource. This is one of the proper ways to get a resource object.
+
+=item * B<getByMapPc>(map_pc):
+
+Based on the map_pc of the resource, get a resource object for
+the given map. This is one of the proper ways to get a resource object.
 
 =cut
 
 # The strategy here is to cache the resource objects, and only construct them
 # as we use them. The real point is to prevent reading any more from the tied
-# hash then we have to, which should hopefully alleviate speed problems.
-# Caching is just an incidental detail I throw in because it makes sense.
+# hash than we have to, which should hopefully alleviate speed problems.
 
 sub getById {
     my $self = shift;
@@ -1185,32 +2696,61 @@ sub getById {
     }
 
     # resource handles inserting itself into cache.
-    return Apache::lonnavmaps::resource->new($self, $id);
+    # Not clear why the quotes are necessary, but as of this
+    # writing it doesn't work without them.
+    return "Apache::lonnavmaps::resource"->new($self, $id);
+}
+
+sub getBySymb {
+    my $self = shift;
+    my $symb = shift;
+
+    my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
+    my $map = $self->getResourceByUrl($mapUrl);
+    my $returnvalue = undef;
+    if (ref($map)) {
+        $returnvalue = $self->getById($map->map_pc() .'.'.$id);
+    }
+    return $returnvalue;
+}
+
+sub getByMapPc {
+    my $self = shift;
+    my $map_pc = shift;
+    my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
+    $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
+    return $self->getById($map_id);
 }
 
 =pod
 
-=item * B<firstResource>(): Returns a resource object reference corresponding to the first resource in the navmap.
+=item * B<firstResource>():
+
+Returns a resource object reference corresponding to the first
+resource in the navmap.
 
 =cut
 
 sub firstResource {
     my $self = shift;
     my $firstResource = $self->navhash('map_start_' .
-                     &Apache::lonnet::clutter($ENV{'request.course.uri'}));
+                     &Apache::lonnet::clutter($env{'request.course.uri'}));
     return $self->getById($firstResource);
 }
 
 =pod
 
-=item * B<finishResource>(): Returns a resource object reference corresponding to the last resource in the navmap.
+=item * B<finishResource>():
+
+Returns a resource object reference corresponding to the last resource
+in the navmap.
 
 =cut
 
 sub finishResource {
     my $self = shift;
     my $firstResource = $self->navhash('map_finish_' .
-                     &Apache::lonnet::clutter($ENV{'request.course.uri'}));
+                     &Apache::lonnet::clutter($env{'request.course.uri'}));
     return $self->getById($firstResource);
 }
 
@@ -1218,114 +2758,880 @@ sub finishResource {
 # the actual lookup; parmval caches the results.
 sub parmval {
     my $self = shift;
-    my ($what,$symb)=@_;
+    my ($what,$symb,$recurse)=@_;
     my $hashkey = $what."|||".$symb;
-
+    my $cache = $self->{PARM_CACHE};
     if (defined($self->{PARM_CACHE}->{$hashkey})) {
-        return $self->{PARM_CACHE}->{$hashkey};
+        if (ref($self->{PARM_CACHE}->{$hashkey}) eq 'ARRAY') { 
+            if (defined($self->{PARM_CACHE}->{$hashkey}->[0])) {
+                if (wantarray) {
+                    return @{$self->{PARM_CACHE}->{$hashkey}};
+                } else {
+                    return $self->{PARM_CACHE}->{$hashkey}->[0];
+                }
+            }
+        } else {
+            return $self->{PARM_CACHE}->{$hashkey};
+        }
     }
 
-    my $result = $self->parmval_real($what, $symb);
+    my $result = $self->parmval_real($what, $symb, $recurse);
     $self->{PARM_CACHE}->{$hashkey} = $result;
-    return $result;
+    if (wantarray) {
+        return @{$result};
+    }
+    return $result->[0];
 }
 
+
 sub parmval_real {
     my $self = shift;
-    my ($what,$symb) = @_;
+    my ($what,$symb,$recurse) = @_;
 
-    my $cid=$ENV{'request.course.id'};
-    my $csec=$ENV{'request.course.sec'};
-    my $uname=$ENV{'user.name'};
-    my $udom=$ENV{'user.domain'};
 
-    unless ($symb) { return ''; }
-    my $result='';
+    # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
+    $self->generate_course_user_opt();
+
+    my $cid=$env{'request.course.id'};
+    my $csec=$env{'request.course.sec'};
+    my $cgroup='';
+    my @cgrps=split(/:/,$env{'request.course.groups'});
+    if (@cgrps > 0) {
+        @cgrps = sort(@cgrps);
+        $cgroup = $cgrps[0];
+    } 
+    my $uname=$self->{USERNAME};
+    my $udom=$self->{DOMAIN};
 
-    my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
+    unless ($symb) { return ['']; }
+    my $result='';
 
+    my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
+    $mapname = &Apache::lonnet::deversion($mapname);
+    my $toolsymb = '';
+    if ($fn =~ /ext\.tool$/) {
+        $toolsymb = $symb;
+    }
+    my ($recursed,@recurseup); 
+    
 # ----------------------------------------------------- Cascading lookup scheme
     my $rwhat=$what;
     $what=~s/^parameter\_//;
     $what=~s/\_/\./;
 
     my $symbparm=$symb.'.'.$what;
+    my $recurseparm=$mapname.'___(rec).'.$what;
     my $mapparm=$mapname.'___(all).'.$what;
-    my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
+    my $usercourseprefix=$cid;
+    
+
+
+    my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
+    my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
+    my $grpleveli=$usercourseprefix.'.['.$cgroup.'].'.$recurseparm;
+    my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
+
 
     my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
     my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
+    my $secleveli=$usercourseprefix.'.['.$csec.'].'.$recurseparm;
     my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
 
+
     my $courselevel= $usercourseprefix.'.'.$what;
     my $courselevelr=$usercourseprefix.'.'.$symbparm;
+    my $courseleveli=$usercourseprefix.'.'.$recurseparm;
     my $courselevelm=$usercourseprefix.'.'.$mapparm;
 
+
     my $useropt = $self->{USER_OPT};
     my $courseopt = $self->{COURSE_OPT};
     my $parmhash = $self->{PARM_HASH};
 
 # ---------------------------------------------------------- first, check user
     if ($uname and defined($useropt)) {
-        if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
-        if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
-        if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
+        if (defined($$useropt{$courselevelr})) { return [$$useropt{$courselevelr},'resource']; }
+        if (defined($$useropt{$courselevelm})) { return [$$useropt{$courselevelm},'map']; }
+        if (defined($$useropt{$courseleveli})) { return [$$useropt{$courseleveli},'map']; }
+        unless ($recursed) {
+            @recurseup = $self->recurseup_maps($mapname);
+            $recursed = 1;
+        }
+        foreach my $item (@recurseup) {
+            my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
+            if (defined($$useropt{$norecursechk})) {
+                if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                    return [$$useropt{$norecursechk},'map'];
+                } else {
+                    last;
+                }
+            }
+            my $recursechk=$usercourseprefix.'.'.$item.'___(rec).'.$what;
+            if (defined($$useropt{$recursechk})) { return [$$useropt{$recursechk},'map']; } 
+        }
+        if (defined($$useropt{$courselevel})) { return [$$useropt{$courselevel},'course']; }
     }
 
 # ------------------------------------------------------- second, check course
-    if ($csec and defined($courseopt)) {
-        if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
-        if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
-        if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
+    if ($cgroup ne '' and defined($courseopt)) {
+        if (defined($$courseopt{$grplevelr})) { return [$$courseopt{$grplevelr},'resource']; }
+        if (defined($$courseopt{$grplevelm})) { return [$$courseopt{$grplevelm},'map']; }
+        if (defined($$courseopt{$grpleveli})) { return [$$courseopt{$grpleveli},'map']; } 
+        unless ($recursed) {
+            @recurseup = $self->recurseup_maps($mapname);
+            $recursed = 1;
+        }
+        foreach my $item (@recurseup) {
+            my $norecursechk=$usercourseprefix.'.['.$cgroup.'].'.$item.'___(all).'.$what;
+            if (defined($$courseopt{$norecursechk})) {
+                if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                    return [$$courseopt{$norecursechk},'map'];
+                } else {
+                   last;
+                }
+            }
+            my $recursechk=$usercourseprefix.'.['.$cgroup.'].'.$item.'___(rec).'.$what;
+            if (defined($$courseopt{$recursechk})) { return [$$courseopt{$recursechk},'map']; }      
+        }
+        if (defined($$courseopt{$grplevel})) { return [$$courseopt{$grplevel},'course']; }
+    }
+
+    if ($csec ne '' and defined($courseopt)) {
+        if (defined($$courseopt{$seclevelr})) { return [$$courseopt{$seclevelr},'resource']; }
+        if (defined($$courseopt{$seclevelm})) { return [$$courseopt{$seclevelm},'map']; }
+        if (defined($$courseopt{$secleveli})) { return [$$courseopt{$secleveli},'map']; } 
+        unless ($recursed) {
+            @recurseup = $self->recurseup_maps($mapname);
+            $recursed = 1;
+        }
+        foreach my $item (@recurseup) {
+            my $norecursechk=$usercourseprefix.'.['.$csec.'].'.$item.'___(all).'.$what;
+            if (defined($$courseopt{$norecursechk})) {
+                if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                    return [$$courseopt{$norecursechk},'map'];
+                } else {
+                    last;
+                }
+            }
+            my $recursechk=$usercourseprefix.'.['.$csec.'].'.$item.'___(rec).'.$what;
+            if (defined($$courseopt{$recursechk})) { return [$$courseopt{$recursechk},'map']; }
+        }
+        if (defined($$courseopt{$seclevel})) { return [$$courseopt{$seclevel},'course']; }
     }
 
     if (defined($courseopt)) {
-        if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
-        if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
-        if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
+        if (defined($$courseopt{$courselevelr})) { return [$$courseopt{$courselevelr},'resource']; }
     }
 
 # ----------------------------------------------------- third, check map parms
 
     my $thisparm=$$parmhash{$symbparm};
-    if (defined($thisparm)) { return $thisparm; }
+    if (defined($thisparm)) { return [$thisparm,'map']; }
 
 # ----------------------------------------------------- fourth , check default
 
-    my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
-    if (defined($default)) { return $default}
-
-# --------------------------------------------------- fifth , cascade up parts
+    my $meta_rwhat=$rwhat;
+    $meta_rwhat=~s/\./_/g;
+    my $default=&Apache::lonnet::metadata($fn,$meta_rwhat,$toolsymb);
+    if (defined($default)) { return [$default,'resource']}
+    $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat,$toolsymb);
+    if (defined($default)) { return [$default,'resource']}
+# --------------------------------------------------- fifth, check more course
+    if (defined($courseopt)) {
+        if (defined($$courseopt{$courselevelm})) { return [$$courseopt{$courselevelm},'map']; }
+        if (defined($$courseopt{$courseleveli})) { return [$$courseopt{$courseleveli},'map']; }
+        unless ($recursed) {
+            @recurseup = $self->recurseup_maps($mapname);
+            $recursed = 1;
+        }
+        foreach my $item (@recurseup) {
+            my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
+            if (defined($$courseopt{$norecursechk})) {
+                if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                    return [$$courseopt{$norecursechk},'map'];
+                } else {
+                    last;
+                }
+            }
+            my $recursechk=$usercourseprefix.'.'.$item.'___(rec).'.$what;
+            if (defined($$courseopt{$recursechk})) {
+                return [$$courseopt{$recursechk},'map'];
+            }
+        }
+        if (defined($$courseopt{$courselevel})) {
+           my $ret = [$$courseopt{$courselevel},'course'];
+           return $ret;
+       }
+    }
+# --------------------------------------------------- sixth , cascade up parts
 
     my ($space,@qualifier)=split(/\./,$rwhat);
     my $qualifier=join('.',@qualifier);
     unless ($space eq '0') {
-        my ($part,$id)=split(/\_/,$space);
-        if ($id) {
-            my $partgeneral=$self->parmval($part.".$qualifier",$symb);
-            if (defined($partgeneral)) { return $partgeneral; }
+	my @parts=split(/_/,$space);
+	my $id=pop(@parts);
+	my $part=join('_',@parts);
+	if ($part eq '') { $part='0'; }
+       my @partgeneral=$self->parmval($part.".$qualifier",$symb,1);
+       if (defined($partgeneral[0])) { return \@partgeneral; }
+    }
+    if ($recurse) { return []; }
+    my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$rwhat,$toolsymb);
+    if (defined($pack_def)) { return [$pack_def,'resource']; }
+    return [''];
+}
+
+sub recurseup_maps {
+    my ($self,$mapname) = @_;
+    my @recurseup;
+    if ($mapname) {
+        my $res = $self->getResourceByUrl($mapname);
+        if (ref($res)) {
+            my @pcs = split(/,/,$res->map_hierarchy());
+            shift(@pcs);
+            if (@pcs) {
+                @recurseup = map { &Apache::lonnet::declutter($self->getByMapPc($_)->src()); } reverse(@pcs);
+            }
+        }
+    }
+    return @recurseup;
+}
+
+sub recursed_crumbs {
+    my ($self,$mapurl,$restitle) = @_;
+    my (@revmapinfo,@revmapres);
+    my $mapres = $self->getResourceByUrl($mapurl);
+    if (ref($mapres)) {
+        @revmapres = map { $self->getByMapPc($_); } split(/,/,$mapres->map_breadcrumbs());
+        shift(@revmapres);
+    }
+    my $allowedlength = 60;
+    my $minlength = 5;
+    my $allowedtitle = 30;
+    if (($env{'environment.icons'} eq 'iconsonly') && (!$env{'browser.mobile'})) {
+        $allowedlength = 100;
+        $allowedtitle = 70;
+    }
+    if (length($restitle) > $allowedtitle) {
+        $restitle = &truncate_crumb_text($restitle,$allowedtitle);
+    }
+    my $totallength = length($restitle);
+    my @links;
+
+    foreach my $map (@revmapres) {
+        my $pc = $map->map_pc();
+        next if ((!$pc) || ($pc == 1));
+        push(@links,$map);
+        push(@revmapinfo,{'href' => $env{'request.use_absolute'}.$map->link().'?navmap=1','text' => $map->title(),'no_mt' => 1,});
+        $totallength += length($map->title());
+    }
+    my $numlinks = scalar(@links);
+    if ($numlinks) {
+        if ($totallength - $allowedlength > 0) {
+            my $available = $allowedlength - length($restitle);
+            my $avg = POSIX::ceil($available/$numlinks);
+            if ($avg < $minlength) {
+                $avg = $minlength;
+            }
+            @revmapinfo = ();
+            foreach my $map (@links) {
+                my $showntitle = &truncate_crumb_text($map->title(),$avg);
+                if ($showntitle ne '') {
+                    push(@revmapinfo,{'href' => $env{'request.use_absolute'}.$map->link().'?navmap=1','text' => $showntitle,'no_mt' => 1,});
+                }
+            }
+        }
+    }
+    if ($restitle ne '') {
+        push(@revmapinfo,{'text' => $restitle, 'no_mt' => 1});
+    }
+    return @revmapinfo;
+}
+
+sub truncate_crumb_text {
+    my ($title,$limit) = @_;
+    my $showntitle = '';
+    if (length($title) > $limit) {
+        my @words = split(/\b\s*/,$title);
+        if (@words == 1) {
+            $showntitle = substr($title,0,$limit).' ...';
         } else {
-            my $resourcegeneral=$self->parmval("0.$qualifier",$symb);
-            if (defined($resourcegeneral)) { return $resourcegeneral; }
+            my $linklength = 0;
+            my $num = 0;
+            foreach my $word (@words) {
+                $linklength += 1+length($word);
+                if ($word eq '-') {
+                    $showntitle =~ s/ $//;
+                    $showntitle .= $word;
+                } elsif ($linklength > $limit) {
+                    if ($num < @words) {
+                        $showntitle .= $word.' ...';
+                        last;
+                    } else {
+                        $showntitle .= $word;
+                    }
+                } else {
+                    $showntitle .= $word.' ';
+                }
+            }
+            $showntitle =~ s/ $//;
+        }
+        return $showntitle;
+    } else {
+        return $title;
+    }
+}
+
+#
+#  Determines the open/close dates for printing a map that
+#  encloses a resource.
+#
+sub map_printdates {
+    my ($self, $res, $part) = @_;
+
+
+
+
+
+    my $opendate = $self->get_mapparam($res->symb(),'',"$part.printstartdate");
+    my $closedate= $self->get_mapparam($res->symb(),'',"$part.printenddate");
+
+
+    return ($opendate, $closedate);
+}
+
+sub get_mapparam {
+    my ($self, $symb, $mapname, $what) = @_;
+
+    # Ensure the course option hash is populated:
+
+    $self->generate_course_user_opt();
+
+    # Get the course id and section if there is one.
+
+    my $cid=$env{'request.course.id'};
+    my $csec=$env{'request.course.sec'};
+    my $cgroup='';
+    my @cgrps=split(/:/,$env{'request.course.groups'});
+    if (@cgrps > 0) {
+        @cgrps = sort(@cgrps);
+        $cgroup = $cgrps[0];
+    } 
+    my $uname=$self->{USERNAME};
+    my $udom=$self->{DOMAIN};
+
+    unless ($symb || $mapname) { return; }
+    my $result='';
+    my ($recursed,@recurseup);
+
+
+    # Figure out which map we are in.
+
+    if ($symb && !$mapname) {
+        my ($id,$fn);
+        ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
+        $mapname = &Apache::lonnet::deversion($mapname);
+    }
+
+
+    my $rwhat=$what;
+    $what=~s/^parameter\_//;
+    $what=~s/\_/\./;
+
+    # Build the hash keys for the lookup:
+
+    my $mapparm=$mapname.'___(all).'.$what;
+    my $recurseparm=$mapname.'___(rec).'.$what; 
+    my $usercourseprefix=$cid;
+
+
+    my $grplevelm    = "$usercourseprefix.[$cgroup].$mapparm";
+    my $seclevelm    = "$usercourseprefix.[$csec].$mapparm";
+    my $courselevelm = "$usercourseprefix.$mapparm";
+
+    my $grpleveli    = "$usercourseprefix.[$cgroup].$recurseparm";
+    my $secleveli    = "$usercourseprefix.[$csec].$recurseparm";
+    my $courseleveli = "$usercourseprefix.$recurseparm";
+
+    # Get handy references to the hashes we need in $self:
+
+    my $useropt = $self->{USER_OPT};
+    my $courseopt = $self->{COURSE_OPT};
+    my $parmhash = $self->{PARM_HASH};
+
+    # Check per user 
+
+
+
+    if ($uname and defined($useropt)) {
+	if (defined($$useropt{$courselevelm})) {
+	    return $$useropt{$courselevelm};
+	}
+        if (defined($$useropt{$courseleveli})) {
+            return $$useropt{$courseleveli};
+        }
+        unless ($recursed) {
+            @recurseup = $self->recurseup_maps($mapname);
+            $recursed = 1;
+        }
+        foreach my $item (@recurseup) {
+            my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
+            if (defined($$useropt{$norecursechk})) {
+                if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                    return $$useropt{$norecursechk};
+                } else {
+                    last;
+                }
+            }
+            my $recursechk=$usercourseprefix.'.'.$item.'___(rec).'.$what;
+            if (defined($$useropt{$recursechk})) {
+                return $$useropt{$recursechk};
+            }
+        }
+    }
+
+    # Check course -- group
+
+
+
+    if ($cgroup ne '' and defined ($courseopt)) {
+	if (defined($$courseopt{$grplevelm})) {
+	    return $$courseopt{$grplevelm};
+	}
+        if (defined($$courseopt{$grpleveli})) {
+            return $$courseopt{$grpleveli};
+        }
+        unless ($recursed) {
+            @recurseup = $self->recurseup_maps($mapname);
+            $recursed = 1;
+        }
+        foreach my $item (@recurseup) {
+            my $norecursechk=$usercourseprefix.'.['.$cgroup.'].'.$item.'___(all).'.$what;
+            if (defined($$courseopt{$norecursechk})) {
+                if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                    return $$courseopt{$norecursechk};
+                } else {
+                    last;
+                }
+            }
+            my $recursechk=$usercourseprefix.'.['.$cgroup.'].'.$item.'___(rec).'.$what;
+            if (defined($$courseopt{$recursechk})) {
+                return $$courseopt{$recursechk};
+            }
+        }
+    }
+
+    # Check course -- section
+
+
+    if ($csec ne '' and defined($courseopt)) {
+	if (defined($$courseopt{$seclevelm})) {
+	    return $$courseopt{$seclevelm};
+	}
+        if (defined($$courseopt{$secleveli})) {
+            return $$courseopt{$secleveli};
+        }
+        unless ($recursed) {
+            @recurseup = $self->recurseup_maps($mapname);
+            $recursed = 1;
+        }
+        foreach my $item (@recurseup) {
+            my $norecursechk=$usercourseprefix.'.['.$csec.'].'.$item.'___(all).'.$what;
+            if (defined($$courseopt{$norecursechk})) {
+                if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                    return $$courseopt{$norecursechk};
+                } else {
+                    last;
+                }
+            }
+            my $recursechk=$usercourseprefix.'.['.$csec.'].'.$item.'___(rec).'.$what;
+            if (defined($$courseopt{$recursechk})) {
+                return $$courseopt{$recursechk};
+            }
+        }
+    }
+    # Check the map parameters themselves:
+
+    if ($symb) {
+        my $symbparm=$symb.'.'.$what;
+        my $thisparm = $$parmhash{$symbparm};
+        if (defined($thisparm)) {
+	    return $thisparm;
+        }
+    }
+
+
+    # Additional course parameters:
+
+    if (defined($courseopt)) {
+	if (defined($$courseopt{$courselevelm})) {
+	    return $$courseopt{$courselevelm};
+	}
+        if (defined($$courseopt{$courseleveli})) {
+            return $$courseopt{$courseleveli};
+        }
+        unless ($recursed) {
+            @recurseup = $self->recurseup_maps($mapname);
+            $recursed = 1;
+        }
+        if (@recurseup) {
+            foreach my $item (@recurseup) {
+                my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
+                if (defined($$courseopt{$norecursechk})) {
+                    if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                        return $$courseopt{$norecursechk};
+                    } else {
+                        last;
+                    }
+                }
+                my $recursechk=$usercourseprefix.'.'.$item.'___(rec).'.$what;
+                if (defined($$courseopt{$recursechk})) {
+                    return $$courseopt{$recursechk};
+                }
+            }
         }
     }
-    return '';
+    return undef;		# Undefined if we got here.
 }
 
+sub course_printdates {
+    my ($self, $symb,  $part) = @_;
+
+
+    my $opendate  = $self->getcourseparam($symb, $part . '.printstartdate');
+    my $closedate = $self->getcourseparam($symb, $part . '.printenddate');
+    return ($opendate, $closedate);
+
+}
+
+sub getcourseparam {
+    my ($self, $symb, $what) = @_;
+
+    $self->generate_course_user_opt(); # If necessary populate the hashes.
+
+    my $uname = $self->{USERNAME};
+    my $udom  = $self->{DOMAIN};
+    
+    # Course, section, group ids come from the env:
+
+    my $cid   = $env{'request.course.id'};
+    my $csec  = $env{'request.course.sec'};
+    my $cgroup = '';		# Assume no group
+
+    my @cgroups = split(/:/, $env{'request.course.groups'});
+    if(@cgroups > 0) {
+	@cgroups = sort(@cgroups);
+	$cgroup  = $cgroups[0];	# There is a course group. 
+   }
+    my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
+    $mapname = &Apache::lonnet::deversion($mapname);
+
+    #
+    # Make the various lookup keys:
+    #
+
+    $what=~s/^parameter\_//;
+    $what=~s/\_/\./;
+
+    # Local refs to the hashes we're going to look at:
+
+    my $useropt   = $self->{USER_OPT};
+    my $courseopt = $self->{COURSE_OPT};
+
+    # 
+    # We want the course level stuff from the way
+    # parmval_real operates 
+    # TODO: Factor some of this stuff out of
+    # both parmval_real and here
+    #
+    my $courselevel = $cid . '.' .  $what;
+    my $grplevel    = $cid . '.[' . $cgroup   . ']' . $what;
+    my $seclevel    = $cid . '.[' . $csec     . ']' . $what;
+
+
+    # Try for the user's course level option:
+
+    if ($uname and defined($useropt)) {
+	if (defined($$useropt{$courselevel})) {
+	    return $$useropt{$courselevel};
+	}
+    }
+    # Try for the group's course level option:
+
+    if ($cgroup ne '' and defined($courseopt)) {
+	if (defined($$courseopt{$grplevel})) {
+	    return $$courseopt{$grplevel};
+	}
+    }
+
+    #  Try for section level parameters:
+
+    if ($csec ne '' and defined($courseopt)) {
+	if (defined($$courseopt{$seclevel})) {
+	    return $$courseopt{$seclevel};
+	}
+    }
+    # Try for 'additional' course parameters:
+
+    if (defined($courseopt)) {
+	if (defined($$courseopt{$courselevel})) {
+	    return $$courseopt{$courselevel};
+	}
+    }
+    return undef;
+
+}
+
+
+=pod
+
+=item * B<getResourceByUrl>(url,multiple):
+
+Retrieves a resource object by URL of the resource, unless the optional
+multiple parameter is included in which case an array of resource 
+objects is returned. If passed a resource object, it will simply return  
+it, so it is safe to use this method in code like
+"$res = $navmap->getResourceByUrl($res)"
+if you're not sure if $res is already an object, or just a URL. If the
+resource appears multiple times in the course, only the first instance 
+will be returned (useful for maps), unless the multiple parameter has
+been included, in which case all instances are returned in an array.
+
+=item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall, noblockcheck):
+
+The map is a specification of a map to retreive the resources from,
+either as a url or as an object. The filterFunc is a reference to a
+function that takes a resource object as its one argument and returns
+true if the resource should be included, or false if it should not
+be. If recursive is true, the map will be recursively examined,
+otherwise it will not be. If bailout is true, the function will return
+as soon as it finds a resource, if false it will finish. If showall is
+true it will not hide maps that contain nothing but one other map. The 
+noblockcheck arg is propagated to become the sixth arg in the call to
+lonnet::allowed when checking a resource's availability during collection
+of resources using the iterator. noblockcheck needs to be true if 
+retrieveResources() was called by a routine that itself was called by 
+lonnet::allowed, in order to avoid recursion.  By default the map  
+is the top-level map of the course, filterFunc is a function that 
+always returns 1, recursive is true, bailout is false, showall is
+false. The resources will be returned in a list containing the
+resource objects for the corresponding resources, with B<no structure 
+information> in the list; regardless of branching, recursion, etc.,
+it will be a flat list.
+
+Thus, this is suitable for cases where you don't want the structure,
+just a list of all resources. It is also suitable for finding out how
+many resources match a given description; for this use, if all you
+want to know is if I<any> resources match the description, the bailout
+parameter will allow you to avoid potentially expensive enumeration of
+all matching resources.
+
+=item * B<hasResource>(map, filterFunc, recursive, showall):
+
+Convenience method for
+
+ scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
+
+which will tell whether the map has resources matching the description
+in the filter function.
+
+=item * B<usedVersion>(url):
+
+Retrieves version infomation for a url. Returns the version (a number, or 
+the string "mostrecent") for resources which have version information in  
+the big hash.
+
+=cut
+
+
+sub getResourceByUrl {
+    my $self = shift;
+    my $resUrl = shift;
+    my $multiple = shift;
+
+    if (ref($resUrl)) { return $resUrl; }
+
+    $resUrl = &Apache::lonnet::clutter($resUrl);
+    my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
+    if (!$resId) { return ''; }
+    if ($multiple) {
+        my @resources = ();
+        my @resIds = split (/,/, $resId);
+        foreach my $id (@resIds) {
+            my $resourceId = $self->getById($id);
+            if ($resourceId) { 
+                push(@resources,$resourceId);
+            }
+        }
+        return @resources;
+    } else {
+        if ($resId =~ /,/) {
+            $resId = (split (/,/, $resId))[0];
+        }
+        return $self->getById($resId);
+    }
+}
+
+sub retrieveResources {
+    my $self = shift;
+    my $map = shift;
+    my $filterFunc = shift;
+    if (!defined ($filterFunc)) {
+        $filterFunc = sub {return 1;};
+    }
+    my $recursive = shift;
+    if (!defined($recursive)) { $recursive = 1; }
+    my $bailout = shift;
+    if (!defined($bailout)) { $bailout = 0; }
+    my $showall = shift;
+    my $noblockcheck = shift;
+    # Create the necessary iterator.
+    if (!ref($map)) { # assume it's a url of a map.
+        $map = $self->getResourceByUrl($map);
+    }
+
+    # If nothing was passed, assume top-level map
+    if (!$map) {
+	$map = $self->getById('0.0');
+    }
+
+    # Check the map's validity.
+    if (!$map->is_map()) {
+        # Oh, to throw an exception.... how I'd love that!
+        return ();
+    }
+
+    # Get an iterator.
+    my $it = $self->getIterator($map->map_start(), $map->map_finish(),
+                                undef, $recursive, $showall);
+
+    my @resources = ();
+
+    if (&$filterFunc($map)) {
+	push(@resources, $map);
+    }
+
+    # Run down the iterator and collect the resources.
+    my $curRes;
+
+    while ($curRes = $it->next(undef,$noblockcheck)) {
+        if (ref($curRes)) {
+            if (!&$filterFunc($curRes)) {
+                next;
+            }
+
+            push(@resources, $curRes);
+
+            if ($bailout) {
+                return @resources;
+            }
+        }
+
+    }
+
+    return @resources;
+}
+
+sub hasResource {
+    my $self = shift;
+    my $map = shift;
+    my $filterFunc = shift;
+    my $recursive = shift;
+    my $showall = shift;
+    
+    return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
+}
+
+sub usedVersion {
+    my $self = shift;
+    my $linkurl = shift;
+    return $self->navhash("version_$linkurl");
+}
+
+sub isFirstResource {
+    my $self = shift;
+    my $map = shift;
+    my $symb = shift;
+    return unless (ref($map));
+    my $isfirst;
+    my $firstResource = $map->map_start();
+    if (ref($firstResource)) {
+        if ((!$firstResource->is_map()) && ($firstResource->src() ne ''))  {
+            if ($firstResource->symb() eq $symb) {
+                $isfirst = 1;
+            } else {
+                $isfirst = 0;
+            }
+        } else {
+            my $it = $self->getIterator($firstResource,undef,undef,1);
+            while ( my $res=$it->next()) {
+                if ((ref($res)) && ($res->src() ne '') && (!$res->is_map())) {
+                    if ($res->symb() eq $symb) {
+                        $isfirst = 1;
+                    } else {
+                        $isfirst = 0;
+                    }
+                    last;
+                }
+            }
+        }
+    }
+    return $isfirst;
+}
+
+sub isLastResource {
+    my $self = shift;
+    my $map = shift;
+    my $symb = shift;
+    return unless (ref($map));
+    my $islast;
+    my $lastResource = $map->map_finish();
+    if (ref($lastResource)) {
+        if ((!$lastResource->is_map()) && ($lastResource->src() ne ''))  {
+            if ($lastResource->symb() eq $symb) {
+                $islast = 1;
+            } else {
+                $islast = 0;
+            }
+        } else {
+            my $currRes = $self->getBySymb($symb);
+            if (ref($currRes)) {
+                my $it = $self->getIterator($currRes,undef,undef,1);
+                while ( my $res=$it->next()) {
+                    if ((ref($res)) && ($res->src() ne '') && (!$res->is_map())) {
+                        if ($res->symb() eq $symb) {
+                            $islast = 1;
+                        } else {
+                            $islast = 0;
+                        }
+                        last;
+                    }
+                }
+            }
+        }
+    }
+    return $islast;
+}
 
 1;
 
 package Apache::lonnavmaps::iterator;
+use Scalar::Util qw(weaken);
+use Apache::lonnet;
 
 =pod
 
 =back
 
-=head1 navmap Iterator
+=head1 Object: navmap Iterator
 
-An I<iterator> encapsulates the logic required to traverse a data structure. navmap uses an iterator to traverse the course map according to the criteria you wish to use.
-
-To obtain an iterator, call the B<getIterator>() function of a B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator directly.) This will return a reference to the iterator:
+An I<iterator> encapsulates the logic required to traverse a data
+structure. navmap uses an iterator to traverse the course map
+according to the criteria you wish to use.
+
+To obtain an iterator, call the B<getIterator>() function of a
+B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
+directly.) This will return a reference to the iterator:
 
 C<my $resourceIterator = $navmap-E<gt>getIterator();>
 
@@ -1337,34 +3643,113 @@ getIterator behaves as follows:
 
 =over 4
 
-=item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop): All parameters are optional. firstResource is a resource reference corresponding to where the iterator should start. It defaults to navmap->firstResource() for the corresponding nav map. finishResource corresponds to where you want the iterator to end, defaulting to navmap->finishResource(). filterHash is a hash used as a set containing strings representing the resource IDs, defaulting to empty. Condition is a 1 or 0 that sets what to do with the filter hash: If a 0, then only resource that exist IN the filterHash will be recursed on. If it is a 1, only resources NOT in the filterHash will be recursed on. Defaults to 0. forceTop is a boolean value. If it is false (default), the iterator will only return the first level of map that is not just a single, 'redirecting' map. If true, the iterator will return all information, starting with the top-level map, regardless of content.
-
-Thus, by default, only top-level resources will be shown. Change the condition to a 1 without changing the hash, and all resources will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively suppress parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively add parts of the nav map. See the handler code for examples.
+=item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap, $deeplinklisted):
 
-The iterator will return either a reference to a resource object, or a token representing something in the map, such as the beginning of a new branch. The possible tokens are:
+All parameters are optional. firstResource is a resource reference
+corresponding to where the iterator should start. It defaults to
+navmap->firstResource() for the corresponding nav map. finishResource
+corresponds to where you want the iterator to end, defaulting to
+navmap->finishResource(). filterHash is a hash used as a set
+containing strings representing the resource IDs, defaulting to
+empty. Condition is a 1 or 0 that sets what to do with the filter
+hash: If a 0, then only resources that exist IN the filterHash will be
+recursed on. If it is a 1, only resources NOT in the filterHash will
+be recursed on. Defaults to 0. forceTop is a boolean value. If it is
+false (default), the iterator will only return the first level of map
+that is not just a single, 'redirecting' map. If true, the iterator
+will return all information, starting with the top-level map,
+regardless of content. returnTopMap, if true (default false), will
+cause the iterator to return the top-level map object (resource 0.0)
+before anything else. deeplinklisted if true (default false), will
+check "listed" status of a resource with a deeplink, and unless "absent"
+will exclude deeplink checking when retrieving the browsePriv from
+lonnet::allowed().
+
+Thus, by default, only top-level resources will be shown. Change the
+condition to a 1 without changing the hash, and all resources will be
+shown. Changing the condition to 1 and including some values in the
+hash will allow you to selectively suppress parts of the navmap, while
+leaving it on 0 and adding things to the hash will allow you to
+selectively add parts of the nav map. See the handler code for
+examples.
+
+The iterator will return either a reference to a resource object, or a
+token representing something in the map, such as the beginning of a
+new branch. The possible tokens are:
 
 =over 4
 
-=item * BEGIN_MAP: A new map is being recursed into. This is returned I<after> the map resource itself is returned.
+=item * B<END_ITERATOR>:
 
-=item * END_MAP: The map is now done.
+The iterator has returned all that it's going to. Further calls to the
+iterator will just produce more of these. This is a "false" value, and
+is the only false value the iterator which will be returned, so it can
+be used as a loop sentinel.
 
-=item * BEGIN_BRANCH: A branch is now starting. The next resource returned will be the first in that branch.
+=item * B<BEGIN_MAP>:
 
-=item * END_BRANCH: The branch is now done.
+A new map is being recursed into. This is returned I<after> the map
+resource itself is returned.
+
+=item * B<END_MAP>:
+
+The map is now done.
+
+=item * B<BEGIN_BRANCH>:
+
+A branch is now starting. The next resource returned will be the first
+in that branch.
+
+=item * B<END_BRANCH>:
+
+The branch is now done.
 
 =back
 
-The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP.
+The tokens are retreivable via methods on the iterator object, i.e.,
+$iterator->END_MAP.
 
-Maps can contain empty resources. The iterator will automatically skip over such resources, but will still treat the structure correctly. Thus, a complicated map with several branches, but consisting entirely of empty resources except for one beginning or ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs, but only one resource will be returned.
+Maps can contain empty resources. The iterator will automatically skip
+over such resources, but will still treat the structure
+correctly. Thus, a complicated map with several branches, but
+consisting entirely of empty resources except for one beginning or
+ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
+but only one resource will be returned.
 
 =back
 
+=head2 Normal Usage
+
+Normal usage of the iterator object is to do the following:
+
+ my $it = $navmap->getIterator([your params here]);
+ my $curRes;
+ while ($curRes = $it->next()) {
+   [your logic here]
+ }
+
+Note that inside of the loop, it's frequently useful to check if
+"$curRes" is a reference or not with the reference function; only
+resource objects will be references, and any non-references will 
+be the tokens described above.
+
+The next() routine can take two (optional) arguments:
+closeAllPages - if true will not recurse down a .page
+noblockcheck - passed to browsePriv() for passing as sixth arg to
+call to lonnet::allowed. This needs to be set if retrieveResources
+was already called from another routine called within lonnet::allowed, 
+so as to prevent recursion.
+
+Also note there is some old code floating around that tries to track
+the depth of the iterator to see when it's done; do not copy that 
+code. It is difficult to get right and harder to understand than
+this. They should be migrated to this new style.
+
 =cut
 
 # Here are the tokens for the iterator:
 
+sub END_ITERATOR { return 0; }
 sub BEGIN_MAP { return 1; }    # begining of a new map
 sub END_MAP { return 2; }      # end of the map
 sub BEGIN_BRANCH { return 3; } # beginning of a branch
@@ -1377,20 +3762,18 @@ sub min {
     if ($a < $b) { return $a; } else { return $b; }
 }
 
-# In the CVS repository, documentation of this algorithm is included 
-# in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
-# will reference the same location in the text as the part of the
-# algorithm is running through.
-
 sub new {
     # magic invocation to create a class instance
     my $proto = shift;
     my $class = ref($proto) || $proto;
     my $self = {};
 
-    $self->{NAV_MAP} = shift;
+    weaken($self->{NAV_MAP} = shift);
     return undef unless ($self->{NAV_MAP});
 
+    $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
+    $self->{DOMAIN}   = $self->{NAV_MAP}->{DOMAIN};
+
     # Handle the parameters
     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
@@ -1412,6 +3795,15 @@ sub new {
     # Do we want to automatically follow "redirection" maps?
     $self->{FORCE_TOP} = shift;
 
+    # Do we want to return the top-level map object (resource 0.0)?
+    $self->{RETURN_0} = shift;
+    # have we done that yet?
+    $self->{HAVE_RETURNED_0} = 0;
+
+    # Do we want to check the "listed" status for a resource for which
+    # deeplinking applies.
+    $self->{DEEPLINKLISTED} = shift;
+
     # Now, we need to pre-process the map, by walking forward and backward
     # over the parts of the map we're going to look at.
 
@@ -1432,6 +3824,9 @@ sub new {
     # that isn't just a redirector.
     my $resource; my $resourceCount = 0;
 
+    # Documentation on this algorithm can be found in the CVS repository at 
+    # /docs/lonnavdocs; these "**#**" markers correspond to documentation
+    # in that file.
     # **1**
 
     foreach my $pass (@iterations) {
@@ -1447,13 +3842,13 @@ sub new {
     
         # prime the recursion
         $self->{$firstResourceName}->{DATA}->{$valName} = 0;
-        my $depth = 0;
-        $iterator->next();
+	$iterator->next();
         my $curRes = $iterator->next();
-        while ($depth > -1) {
-            if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
-            if ($curRes == $iterator->END_MAP()) { $depth--; }
-        
+	my $depth = 1;
+        while ($depth > 0) {
+	    if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
+	    if ($curRes == $iterator->END_MAP()) { $depth--; }
+
             if (ref($curRes)) {
                 # If there's only one resource, this will save it
                 # we have to filter empty resources from consideration here,
@@ -1486,21 +3881,22 @@ sub new {
                 
                 $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
                 if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
-                }
-            $curRes = $iterator->next();
+            }
+
+	    $curRes = $iterator->next();
         }
     }
 
     # Check: Was this only one resource, a map?
-    if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) { 
+    if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) { 
         my $firstResource = $resource->map_start();
         my $finishResource = $resource->map_finish();
-        return 
-            Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
-                                              $finishResource, $self->{FILTER},
-                                              $self->{ALREADY_SEEN}, 
-                                              $self->{CONDITION}, 0);
-        
+	return Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
+						 $finishResource, $self->{FILTER},
+						 $self->{ALREADY_SEEN}, 
+						 $self->{CONDITION},
+						 $self->{FORCE_TOP},
+                                                 undef,$self->{DEEPLINKLISTED});
     }
 
     # Set up some bookkeeping information.
@@ -1508,6 +3904,7 @@ sub new {
     $self->{MAX_DEPTH} = $maxDepth;
     $self->{STACK} = [];
     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
+    $self->{FINISHED} = 0; # When true, the iterator has finished
 
     for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
         push @{$self->{STACK}}, [];
@@ -1518,16 +3915,32 @@ sub new {
     $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
 
     bless ($self);
-
     return $self;
 }
 
 sub next {
     my $self = shift;
+    my $closeAllPages=shift;
+    my $noblockcheck = shift;
+    if ($self->{FINISHED}) {
+	return END_ITERATOR();
+    }
+
+    # If we want to return the top-level map object, and haven't yet,
+    # do so.
+    if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
+        $self->{HAVE_RETURNED_0} = 1;
+	my $nextTopLevel = $self->{NAV_MAP}->getById('0.0');
+        return $self->{NAV_MAP}->getById('0.0');
+    }
+    if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0_BEGIN_MAP}) {
+	$self->{HAVE_RETURNED_0_BEGIN_MAP} = 1;
+	return $self->BEGIN_MAP();
+    }
 
     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
         # grab the next from the recursive iterator 
-        my $next = $self->{RECURSIVE_ITERATOR}->next();
+        my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
 
         # is it a begin or end map? If so, update the depth
         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
@@ -1537,7 +3950,6 @@ sub next {
         if ($self->{RECURSIVE_DEPTH} == 0) {
             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
         }
-
         return $next;
     }
 
@@ -1577,6 +3989,7 @@ sub next {
             $self->{CURRENT_DEPTH}--;
             return END_BRANCH();
         } else {
+	    $self->{FINISHED} = 1;
             return END_MAP();
         }
     }
@@ -1612,6 +4025,8 @@ sub next {
     # So we need to look at all the resources we can get to from here,
     # categorize them if we haven't seen them, remember if we have a new
     my $nextUnfiltered = $here->getNext();
+
+
     my $maxDepthAdded = -1;
     
     for (@$nextUnfiltered) {
@@ -1624,7 +4039,7 @@ sub next {
     }
 
     # Is this the end of a branch? If so, all of the resources examined above
-    # led to lower levels then the one we are currently at, so we push a END_BRANCH
+    # led to lower levels than the one we are currently at, so we push a END_BRANCH
     # marker onto the stack so we don't forget.
     # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
     # BC branch and gets to C, it will see F as the only next resource, but it's
@@ -1640,23 +4055,28 @@ sub next {
 
     # That ends the main iterator logic. Now, do we want to recurse
     # down this map (if this resource is a map)?
-    if ($self->{HERE}->is_map() &&
-        (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
+    if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
+        (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION}) &&
+        ($env{'request.role.adv'} || !$self->{HERE}->randomout())) {
         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
         my $firstResource = $self->{HERE}->map_start();
         my $finishResource = $self->{HERE}->map_finish();
-
         $self->{RECURSIVE_ITERATOR} = 
             Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                                               $finishResource, $self->{FILTER},
-                                              $self->{ALREADY_SEEN}, $self->{CONDITION});
+                                              $self->{ALREADY_SEEN},
+					      $self->{CONDITION},
+					      $self->{FORCE_TOP},
+                                              undef,$self->{DEEPLINKLISTED});
     }
 
     # If this is a blank resource, don't actually return it.
     # Should you ever find you need it, make sure to add an option to the code
     #  that you can use; other things depend on this behavior.
-    if (!$self->{HERE}->src()) {
-        return $self->next();
+    my $browsePriv = $self->{HERE}->browsePriv($noblockcheck,$self->{DEEPLINKLISTED});
+    if (!$self->{HERE}->src() || 
+        (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
+        return $self->next($closeAllPages);
     }
 
     return $self->{HERE};
@@ -1665,7 +4085,13 @@ sub next {
 
 =pod
 
-The other method available on the iterator is B<getStack>, which returns an array populated with the current 'stack' of maps, as references to the resource objects. Example: This is useful when making the navigation map, as we need to check whether we are under a page map to see if we need to link directly to the resource, or to the page. The first elements in the array will correspond to the top of the stack (most inclusive map).
+The other method available on the iterator is B<getStack>, which
+returns an array populated with the current 'stack' of maps, as
+references to the resource objects. Example: This is useful when
+making the navigation map, as we need to check whether we are under a
+page map to see if we need to link directly to the resource, or to the
+page. The first elements in the array will correspond to the top of
+the stack (most inclusive map).
 
 =cut
 
@@ -1694,6 +4120,8 @@ sub populateStack {
 1;
 
 package Apache::lonnavmaps::DFSiterator;
+use Scalar::Util qw(weaken);
+use Apache::lonnet;
 
 # Not documented in the perldoc: This is a simple iterator that just walks
 #  through the nav map and presents the resources in a depth-first search
@@ -1702,7 +4130,7 @@ package Apache::lonnavmaps::DFSiterator;
 #  useful for pre-processing of some kind, and is in fact used by the main
 #  iterator that way, but that's about it.
 # One could imagine merging this into the init routine of the main iterator,
-#  but this might as well be left seperate, since it is possible some other
+#  but this might as well be left separate, since it is possible some other
 #  use might be found for it. - Jeremy
 
 # Unlike the main iterator, this DOES return all resources, even blank ones.
@@ -1722,9 +4150,12 @@ sub new {
     my $class = ref($proto) || $proto;
     my $self = {};
 
-    $self->{NAV_MAP} = shift;
+    weaken($self->{NAV_MAP} = shift);
     return undef unless ($self->{NAV_MAP});
 
+    $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
+    $self->{DOMAIN}   = $self->{NAV_MAP}->{DOMAIN};
+
     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
 
@@ -1739,7 +4170,7 @@ sub new {
 
     # A hash, used as a set, of resource already seen
     $self->{ALREADY_SEEN} = shift;
-    if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
+     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
     $self->{CONDITION} = shift;
     $self->{DIRECTION} = shift || FORWARD();
 
@@ -1821,9 +4252,9 @@ sub next {
 
     # filter the next possibilities to remove things we've 
     # already seen.
-    foreach (@$nextUnfiltered) {
-        if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
-            push @$next, $_;
+    foreach my $item (@$nextUnfiltered) {
+        if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
+            push @$next, $item;
         }
     }
 
@@ -1848,33 +4279,107 @@ sub next {
     return $self->{HERE};
 }
 
-1;
-
-package Apache::lonnavmaps::resource;
+# Identical to the full iterator methods of the same name. Hate to copy/paste
+# but I also hate to "inherit" either iterator from the other.
 
-use Apache::lonnet;
+sub getStack {
+    my $self=shift;
 
-=pod
+    my @stack;
 
-=head1 Object: resource
+    $self->populateStack(\@stack);
 
-A resource object encapsulates a resource in a resource map, allowing easy manipulation of the resource, querying the properties of the resource (including user properties), and represents a reference that can be used as the canonical representation of the resource by lonnavmap clients like renderers.
+    return \@stack;
+}
 
-A resource only makes sense in the context of a navmap, as some of the data is stored in the navmap object.
+# Private method: Calls the iterators recursively to populate the stack.
+sub populateStack {
+    my $self=shift;
+    my $stack = shift;
 
-You will probably never need to instantiate this object directly. Use Apache::lonnavmap::navmap, and use the "start" method to obtain the starting resource.
+    push @$stack, $self->{HERE} if ($self->{HERE});
 
-=head2 Public Members
+    if ($self->{RECURSIVE_ITERATOR_FLAG}) {
+        $self->{RECURSIVE_ITERATOR}->populateStack($stack);
+    }
+}
 
-resource objects have a hash called DATA ($resourceRef->{DATA}) that you can store whatever you want in. This allows you to easily do two-pass algorithms without worrying about managing your own resource->data hash.
+1;
 
-=head2 Methods
+package Apache::lonnavmaps::resource;
+use Scalar::Util qw(weaken);
+use Apache::lonnet;
 
-=over 4
+=pod
 
-=item * B<new>($navmapRef, $idString): The first arg is a reference to the parent navmap object. The second is the idString of the resource itself. Very rarely, if ever, called directly. Use the nav map->getByID() method.
+=head1 Object: resource 
 
-=back
+X<resource, navmap object>
+A resource object encapsulates a resource in a resource map, allowing
+easy manipulation of the resource, querying the properties of the
+resource (including user properties), and represents a reference that
+can be used as the canonical representation of the resource by
+lonnavmap clients like renderers.
+
+A resource only makes sense in the context of a navmap, as some of the
+data is stored in the navmap object.
+
+You will probably never need to instantiate this object directly. Use
+Apache::lonnavmaps::navmap, and use the "start" method to obtain the
+starting resource.
+
+Resource objects respect the parameter_hiddenparts, which suppresses 
+various parts according to the wishes of the map author. As of this
+writing, there is no way to override this parameter, and suppressed
+parts will never be returned, nor will their response types or ids be
+stored.
+
+=head2 Overview
+
+A B<Resource> is the most granular type of object in LON-CAPA that can
+be included in a course. It can either be a particular resource, like
+an HTML page, external resource, problem, etc., or it can be a
+container sequence, such as a "page" or a "map".
+
+To see a sequence from the user's point of view, please see the
+B<Creating a Course: Maps and Sequences> chapter of the Author's
+Manual.
+
+A Resource Object, once obtained from a navmap object via a B<getBy*>
+method of the navmap, or from an iterator, allows you to query
+information about that resource.
+
+Generally, you do not ever want to create a resource object yourself,
+so creation has been left undocumented. Always retrieve resources
+from navmap objects.
+
+=head3 Identifying Resources
+
+X<big hash>Every resource is identified by a Resource ID in the big hash that is
+unique to that resource for a given course. X<resource ID, in big hash>
+The Resource ID has the form #.#, where the first number is the same
+for every resource in a map, and the second is unique. For instance,
+for a course laid out like this:
+
+ * Problem 1
+ * Map
+   * Resource 2
+   * Resource 3
+
+C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
+C<Resource 3> will share a first number. The second number may end up
+re-used between the two groups.
+
+The resource ID is only used in the big hash, but can be used in the
+context of a course to identify a resource easily. (For instance, the
+printing system uses it to record which resources from a sequence you 
+wish to print.)
+
+X<symb> X<resource, symb>
+All resources also have B<symb>s, which uniquely identify a resource
+in a course. Many internal LON-CAPA functions expect a symb. A symb
+carries along with it the URL of the resource, and the map it appears
+in. Symbs are much larger than resource IDs.
 
 =cut
 
@@ -1884,20 +4389,28 @@ sub new {
     my $class = ref($proto) || $proto;
     my $self = {};
 
-    $self->{NAV_MAP} = shift;
+    weaken($self->{NAV_MAP} = shift);
     $self->{ID} = shift;
 
+    $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
+    $self->{DOMAIN}   = $self->{NAV_MAP}->{DOMAIN};
+
     # Store this new resource in the parent nav map's cache.
     $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
     $self->{RESOURCE_ERROR} = 0;
 
+    $self->{DUEDATE_CACHE} = undef;
+
     # A hash that can be used by two-pass algorithms to store data
     # about this resource in. Not used by the resource object
     # directly.
     $self->{DATA} = {};
-   
+    
     bless($self);
     
+    # This is a speed optimization, to avoid calling symb() too often.
+    $self->{SYMB} = $self->symb();
+
     return $self;
 }
 
@@ -1908,36 +4421,71 @@ sub navHash {
     my $self = shift;
     my $param = shift;
     my $id = shift;
-    return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
+    my $arg = $param . ($id?$self->{ID}:"");
+    if (ref($self) && ref($self->{NAV_MAP}) && defined($arg)) {
+        return $self->{NAV_MAP}->navhash($arg);
+    }
+    return;
 }
 
 =pod
 
-B<Metadata Retreival>
+=head2 Methods
+
+Once you have a resource object, here's what you can do with it:
 
-These are methods that help you retrieve metadata about the resource: Method names are based on the fields in the compiled course representation.
+=head3 Attribute Retrieval
+
+Every resource has certain attributes that can be retrieved and used:
 
 =over 4
 
-=item * B<compTitle>: Returns a "composite title", that is equal to $res->title() if the resource has a title, and is otherwise the last part of the URL (e.g., "problem.problem").
+=item * B<ID>: Every resource has an ID that is unique for that
+    resource in the course it is in. The ID is actually in the hash
+    representing the resource, so for a resource object $res, obtain
+    it via C<$res->{ID}).
+
+=item * B<compTitle>:
+
+Returns a "composite title", that is equal to $res->title() if the
+resource has a title, and is otherwise the last part of the URL (e.g.,
+"problem.problem").
+
+=item * B<ext>:
+
+Returns true if the resource is external.
+
+=item * B<kind>:
+
+Returns the kind of the resource from the compiled nav map.
+
+=item * B<randomout>:
 
-=item * B<ext>: Returns true if the resource is external.
+Returns true if this resource was chosen to NOT be shown to the user
+by the random map selection feature. In other words, this is usually
+false.
 
-=item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
+=item * B<randompick>:
 
-=item * B<kind>: Returns the kind of the resource from the compiled nav map.
+Returns the number of randomly picked items for a map if the randompick
+feature is being used on the map. 
 
-=item * B<randomout>: Returns true if this resource was chosen to NOT be shown to the user by the random map selection feature. In other words, this is usually false.
+=item * B<randomorder>:
 
-=item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)
+Returns true for a map if the randomorder feature is being used on the
+map.
 
-=item * B<src>: Returns the source for the resource.
+=item * B<src>:
 
-=item * B<symb>: Returns the symb for the resource.
+Returns the source for the resource.
 
-=item * B<title>: Returns the title of the resource.
+=item * B<symb>:
 
-=item * B<to>: Returns the "to" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
+Returns the symb for the resource.
+
+=item * B<title>:
+
+Returns the title of the resource.
 
 =back
 
@@ -1946,39 +4494,102 @@ These are methods that help you retrieve
 # These info functions can be used directly, as they don't return
 # resource information.
 sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
+sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
 sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
 sub from { my $self=shift; return $self->navHash("from_", 1); }
+# considered private and undocumented
 sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
 sub kind { my $self=shift; return $self->navHash("kind_", 1); }
 sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
+sub deeplinkout { my $self=shift; return $self->navHash("deeplinkout_", 1); }
 sub randompick { 
     my $self = shift;
-    return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
-                                               '.0.parameter_randompick'};
+    my $randompick = $self->parmval('randompick');
+    return $randompick;
+}
+sub randomorder { 
+    my $self = shift;
+    my $randomorder = $self->parmval('randomorder');
+    return ($randomorder =~ /^yes$/i);
+}
+sub link {
+    my $self=shift;
+    if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
+    return $self->src;
 }
 sub src { 
     my $self=shift;
     return $self->navHash("src_", 1);
 }
+sub shown_symb {
+    my $self=shift;
+    if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->{SYMB});}
+    return $self->{SYMB};
+}
+sub id {
+    my $self=shift;
+    return $self->{ID};
+}
+sub enclosing_map_src {
+    my $self=shift;
+    (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
+    return $self->navHash('map_id_'.$first);
+}
 sub symb {
     my $self=shift;
+    if (defined $self->{SYMB}) { return $self->{SYMB}; }
     (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
     my $symbSrc = &Apache::lonnet::declutter($self->src());
-    return &Apache::lonnet::declutter(
-         $self->navHash('map_id_'.$first)) 
+    my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first)) 
         . '___' . $second . '___' . $symbSrc;
+    return &Apache::lonnet::symbclean($symb);
+}
+sub wrap_symb {
+    my $self = shift;
+    return $self->{NAV_MAP}->wrap_symb($self->{SYMB});
 }
-sub title { my $self=shift; return $self->navHash("title_", 1); }
+sub title { 
+    my $self=shift; 
+    if ($self->{ID} eq '0.0') {
+	# If this is the top-level map, return the title of the course
+	# since this map can not be titled otherwise.
+	return $env{'course.'.$env{'request.course.id'}.'.description'};
+    }
+    return $self->navHash("title_", 1); }
+# considered private and undocumented
 sub to { my $self=shift; return $self->navHash("to_", 1); }
+sub condition {
+    my $self=shift;
+    my $undercond=$self->navHash("undercond_", 1);
+    if (!defined($undercond)) { return 1; };
+    my $condid=$self->navHash("condid_$undercond");
+    if (!defined($condid)) { return 1; };
+    my $condition=&Apache::lonnet::directcondval($condid);
+    return $condition;
+}
+sub condval {
+    my $self=shift;
+    my ($pathname,$filename) = 
+	&Apache::lonnet::split_uri_for_cond($self->src());
+
+    my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
+	       /\&\Q$filename\E\:([\d\|]+)\&/);
+    if ($match) {
+	return &Apache::lonnet::condval($1);
+    }
+    return 0;
+}
 sub compTitle {
     my $self = shift;
     my $title = $self->title();
+    $title=~s/\&colon\;/\:/gs;
     if (!$title) {
         $title = $self->src();
         $title = substr($title, rindex($title, '/') + 1);
     }
     return $title;
 }
+
 =pod
 
 B<Predicate Testing the Resource>
@@ -1987,21 +4598,49 @@ These methods are shortcuts to deciding
 
 =over 4
 
-=item * B<is_map>: Returns true if the resource is a map type.
+=item * B<is_map>:
+
+Returns true if the resource is a map type.
+
+=item * B<is_problem>:
 
-=item * B<is_problem>: Returns true if the resource is a problem type, false otherwise. (Looks at the extension on the src field; might need more to work correctly.)
+Returns true if the resource is a problem type, false
+otherwise. (Looks at the extension on the src field; might need more
+to work correctly.)
 
-=item * B<is_page>: Returns true if the resource is a page.
+=item * B<is_page>:
 
-=item * B<is_problem>: Returns true if the resource is a problem.
+Returns true if the resource is a page.
 
-=item * B<is_sequence>: Returns true if the resource is a sequence.
+=item * B<is_sequence>:
+
+Returns true if the resource is a sequence.
 
 =back
 
 =cut
 
+sub hasResource {
+   my $self = shift;
+   return $self->{NAV_MAP}->hasResource(@_);
+}
 
+sub retrieveResources {
+   my $self = shift;
+   return $self->{NAV_MAP}->retrieveResources(@_);
+}
+
+sub is_exam {
+    my ($self,$part) = @_;
+    my $type = $self->parmval('type',$part);
+    if ($type eq 'exam') {
+        return 1;
+    }
+    if ($self->src() =~ /\.(exam)$/) {
+        return 1;
+    }
+    return 0;
+}
 sub is_html {
     my $self=shift;
     my $src = $self->src();
@@ -2011,42 +4650,181 @@ sub is_map { my $self=shift; return defi
 sub is_page {
     my $self=shift;
     my $src = $self->src();
-    return ($src =~ /page$/);
+    return $self->navHash("is_map_", 1) && 
+	$self->navHash("map_type_" . $self->map_pc()) eq 'page';
+}
+sub is_practice {
+    my $self=shift;
+    my ($part) = @_;
+    my $type = $self->parmval('type',$part);
+    if ($type eq 'practice') {
+        return 1;
+    }
+    return 0;
 }
 sub is_problem {
     my $self=shift;
     my $src = $self->src();
-    return ($src =~ /problem$/);
+    if ($src =~ /$LONCAPA::assess_re/) {
+	return !($self->is_practice());
+    }
+    return 0;
+}
+sub is_tool {
+    my $self=shift;
+    my $src = $self->src();
+    return ($src =~ /ext\.tool$/);
+}
+sub is_gradable {
+    my $self=shift;
+    my $src = $self->src();
+    if (($src =~ /$LONCAPA::assess_re/) ||
+        (($self->is_tool()) && ($self->parmval('gradable',0) =~ /^yes$/i))) {
+        return !($self->is_practice());
+    }
+}
+#
+#  The has below is the set of status that are considered 'incomplete'
+#
+my %incomplete_hash = 
+(
+ TRIES_LEFT()     => 1,
+ OPEN()           => 1,
+ ATTEMPTED()      => 1
+
+ );
+#
+#  Return tru if a problem is incomplete... for now incomplete means that
+#  any part of the problem is incomplete. 
+#  Note that if the resources is not a problem, 0 is returned.
+#
+sub is_incomplete {
+    my $self = shift;
+    if ($self->is_problem()) {
+	foreach my $part (@{$self->parts()}) {
+	    if (exists($incomplete_hash{$self->status($part)})) {
+		return 1;
+	    }
+	}
+    }
+    return 0;
+       
+}
+sub is_raw_problem {
+    my $self=shift;
+    my $src = $self->src();
+    if ($src =~ /$LONCAPA::assess_re/) {
+        return 1;
+    }
+    return 0;
+}
+
+sub contains_problem {
+    my $self=shift;
+    if ($self->is_page()) {
+	my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
+	return $hasProblem;
+    }
+    return 0;
+}
+sub map_contains_problem {
+    my $self=shift;
+    if ($self->is_map()) {
+	my $has_problem=
+	    $self->hasResource($self,sub { $_[0]->is_problem() },1);
+	return $has_problem;
+    }
+    return 0;
 }
 sub is_sequence {
     my $self=shift;
+    return $self->navHash("is_map_", 1) && 
+    $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
+}
+sub is_survey {
+    my $self = shift();
+    my $part = shift();
+    my $type = $self->parmval('type',$part);
+    if (($type eq 'survey') || ($type eq 'surveycred')) {
+        return 1;
+    }
+    if ($self->src() =~ /\.(survey)$/) {
+        return 1;
+    }
+    return 0;
+}
+sub is_anonsurvey {
+    my $self = shift();
+    my $part = shift();
+    my $type = $self->parmval('type',$part);
+    if (($type eq 'anonsurvey') || ($type eq 'anonsurveycred')) {
+        return 1;
+    }
+    return 0;
+}
+sub is_task {
+    my $self=shift;
     my $src = $self->src();
-    return ($src =~ /sequence$/);
+    return ($src =~ /\.(task)$/)
+}
+
+sub is_empty_sequence {
+    my $self=shift;
+    return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
 }
 
 # Private method: Shells out to the parmval in the nav map, handler parts.
 sub parmval {
     my $self = shift;
     my $what = shift;
-    my $part = shift || "0";
-    return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
+    my $part = shift;
+    if (!defined($part)) { 
+        $part = '0'; 
+    }
+    return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->{SYMB});
 }
 
 =pod
 
 B<Map Methods>
 
-These methods are useful for getting information about the map properties of the resource, if the resource is a map (B<is_map>).
+These methods are useful for getting information about the map
+properties of the resource, if the resource is a map (B<is_map>).
 
 =over 4
 
-=item * B<map_finish>: Returns a reference to a resource object corresponding to the finish resource of the map.
+=item * B<map_finish>:
+
+Returns a reference to a resource object corresponding to the finish
+resource of the map.
+
+=item * B<map_pc>:
+
+Returns the pc value of the map, which is the first number that
+appears in the resource ID of the resources in the map, and is the
+number that appears around the middle of the symbs of the resources in
+that map.
+
+=item * B<map_start>:
+
+Returns a reference to a resource object corresponding to the start
+resource of the map.
+
+=item * B<map_type>:
 
-=item * B<map_pc>: Returns the pc value of the map, which is the first number that appears in the resource ID of the resources in the map, and is the number that appears around the middle of the symbs of the resources in that map.
+Returns a string with the type of the map in it.
 
-=item * B<map_start>: Returns a reference to a resource object corresponding to the start resource of the map.
+=item * B<map_hierarchy>:
 
-=item * B<map_type>: Returns a string with the type of the map in it.
+Returns a string with a comma-separated ordered list of map_pc IDs
+for the hierarchy of maps containing a map, with the top level
+map first, then descending to deeper levels, with the enclosing map last.
+
+=item * B<map_breadcrumbs>:
+
+Same as map_hierarchy, except maps containing only a single itemm if
+it's a map, or containing no items are omitted, unless it's the top
+level map (map_pc = 1), which is always included.
 
 =back
 
@@ -2055,6 +4833,7 @@ These methods are useful for getting inf
 sub map_finish {
     my $self = shift;
     my $src = $self->src();
+    $src = &Apache::lonnet::clutter($src);
     my $res = $self->navHash("map_finish_$src", 0);
     $res = $self->{NAV_MAP}->getById($res);
     return $res;
@@ -2067,6 +4846,7 @@ sub map_pc {
 sub map_start {
     my $self = shift;
     my $src = $self->src();
+    $src = &Apache::lonnet::clutter($src);
     my $res = $self->navHash("map_start_$src", 0);
     $res = $self->{NAV_MAP}->getById($res);
     return $res;
@@ -2076,8 +4856,16 @@ sub map_type {
     my $pc = $self->map_pc();
     return $self->navHash("map_type_$pc", 0);
 }
-
-
+sub map_hierarchy {
+    my $self = shift;
+    my $pc = $self->map_pc();
+    return $self->navHash("map_hierarchy_$pc", 0);
+}
+sub map_breadcrumbs {
+    my $self = shift;
+    my $pc = $self->map_pc();
+    return $self->navHash("map_breadcrumbs_$pc", 0);
+}
 
 #####
 # Property queries
@@ -2085,85 +4873,285 @@ sub map_type {
 
 # These functions will be responsible for returning the CORRECT
 # VALUE for the parameter, no matter what. So while they may look
-# like direct calls to parmval, they can be more then that.
+# like direct calls to parmval, they can be more than that.
 # So, for instance, the duedate function should use the "duedatetype"
-# information, rather then the resource object user.
+# information, rather than the resource object user.
 
 =pod
 
 =head2 Resource Parameters
 
-In order to use the resource parameters correctly, the nav map must have been instantiated with genCourseAndUserOptions set to true, so the courseopt and useropt is read correctly. Then, you can call these functions to get the relevant parameters for the resource. Each function defaults to part "0", but can be directed to another part by passing the part as the parameter.
-
-These methods are responsible for getting the parameter correct, not merely reflecting the contents of the GDBM hashes. As we move towards dates relative to other dates, these methods should be updated to reflect that. (Then, anybody using these methods won't have to update their code.)
+In order to use the resource parameters correctly, the nav map must
+have been instantiated with genCourseAndUserOptions set to true, so
+the courseopt and useropt is read correctly. Then, you can call these
+functions to get the relevant parameters for the resource. Each
+function defaults to part "0", but can be directed to another part by
+passing the part as the parameter.
+
+These methods are responsible for getting the parameter correct, not
+merely reflecting the contents of the GDBM hashes. As we move towards
+dates relative to other dates, these methods should be updated to
+reflect that. (Then, anybody using these methods will not have to update
+their code.)
 
 =over 4
 
-=item * B<acc>: Get the Client IP/Name Access Control information.
 
-=item * B<answerdate>: Get the answer-reveal date for the problem.
+=item * B<printable>
+
+returns true if the current date is such that the 
+specified resource part is printable.
+
+
+=item * B<resprintable>
+
+Returns true if all parts in the resource are printable making the
+entire resource printable.
+
+=item * B<acc>
+
+Get the Client IP/Name Access Control information.
+
+=item * B<answerdate>:
+
+Get the answer-reveal date for the problem.
+
+=item * B<awarded>: 
+
+Gets the awarded value for the problem part. Requires genUserData set to
+true when the navmap object was created.
+
+=item * B<duedate>:
 
-=item * B<duedate>: Get the due date for the problem.
+Get the due date for the problem.
 
-=item * B<tries>: Get the number of tries the student has used on the problem.
+=item * B<tries>:
 
-=item * B<maxtries>: Get the number of max tries allowed.
+Get the number of tries the student has used on the problem.
 
-=item * B<opendate>: Get the open date for the problem.
+=item * B<maxtries>:
 
-=item * B<sig>: Get the significant figures setting.
+Get the number of max tries allowed.
 
-=item * B<tol>: Get the tolerance for the problem.
+=item * B<opendate>:
 
-=item * B<tries>: Get the number of tries the user has already used on the problem.
+Get the open date for the problem.
 
-=item * B<type>: Get the question type for the problem.
+=item * B<sig>:
 
-=item * B<weight>: Get the weight for the problem.
+Get the significant figures setting.
+
+=item * B<tol>:
+
+Get the tolerance for the problem.
+
+=item * B<tries>:
+
+Get the number of tries the user has already used on the problem.
+
+=item * B<type>:
+
+Get the question type for the problem.
+
+=item * B<weight>:
+
+Get the weight for the problem.
 
 =back
 
 =cut
 
+
+
+
+sub printable {
+
+    my ($self, $part) = @_;
+
+    #  The following cases apply:
+    #  - If a start date is not set, it is replaced by the open date.
+    #  - Ditto for start/open replaced by content open.
+    #  - If neither start nor printdates are set the part is printable.
+    #  - Start date set but no end date: Printable if now >= start date.
+    #  - End date set but no start date: Printable if now <= end date.
+    #  - both defined: printable if start <= now <= end
+    #
+
+    # Get the print open/close dates for the resource.
+
+    my $start = $self->parmval("printstartdate", $part);
+    my $end   = $self->parmval("printenddate", $part);
+
+    if (!$start) {
+	$start = $self->parmval("opendate", $part);
+    }
+    if (!$start) {
+	$start = $self->parmval("contentopen", $part);
+    }
+
+
+    my $now  = time();
+
+
+    my $startok = 1;
+    my $endok   = 1;
+
+    if ((defined $start) && ($start ne '')) {
+	$startok = $start <= $now;
+    }
+    if ((defined $end) && ($end != '')) {
+	$endok = $end >= $now;
+    }
+    return $startok && $endok;
+}
+
+sub resprintable {
+    my $self = shift;
+
+    # get parts...or realize there are no parts.
+
+    my $partsref = $self->parts();
+    my @parts    = @$partsref;
+
+    if (!@parts) {
+	return $self->printable(0);
+    } else {
+	foreach my $part  (@parts) {
+	    if (!$self->printable($part)) { 
+		return 0; 
+	    }
+	}
+	return 1;
+    }
+}
+
 sub acc {
     (my $self, my $part) = @_;
-    return $self->parmval("acc", $part);
+    my $acc = $self->parmval("acc", $part);
+    return $acc;
 }
 sub answerdate {
     (my $self, my $part) = @_;
     # Handle intervals
-    if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
-        return $self->duedate($part) + 
-            $self->parmval("answerdate", $part);
+    my $answerdatetype = $self->parmval("answerdate.type", $part);
+    my $answerdate = $self->parmval("answerdate", $part);
+    my $duedate = $self->parmval("duedate", $part);
+    if ($answerdatetype eq 'date_interval') {
+        $answerdate = $duedate + $answerdate; 
+    }
+    return $answerdate;
+}
+sub awarded { 
+    my $self = shift; my $part = shift;
+    $self->{NAV_MAP}->get_user_data();
+    if (!defined($part)) { $part = '0'; }
+    return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.awarded'};
+}
+sub taskversion {
+    my $self = shift; my $part = shift;
+    $self->{NAV_MAP}->get_user_data();
+    if (!defined($part)) { $part = '0'; }
+    return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.version'};
+}
+sub taskstatus {
+    my $self = shift; my $part = shift;
+    $self->{NAV_MAP}->get_user_data();
+    if (!defined($part)) { $part = '0'; }
+    return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$self->taskversion($part).'.'.$part.'.status'};
+}
+sub solved {
+    my $self = shift; my $part = shift;
+    $self->{NAV_MAP}->get_user_data();
+    if (!defined($part)) { $part = '0'; }
+    return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.solved'};
+}
+sub checkedin {
+    my $self = shift; my $part = shift;
+    $self->{NAV_MAP}->get_user_data();
+    if (!defined($part)) { $part = '0'; }
+    if ($self->is_task()) {
+        my $version = $self->taskversion($part);
+        return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$version .'.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$version .'.'.$part.'.checkedin.slot'});
+    } else {
+        return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.checkedin.slot'});
     }
-    return $self->parmval("answerdate", $part);
 }
-sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
+# this should work exactly like the copy in lonhomework.pm
+# Why is there a copy in lonhomework?  Why not centralized?
+#
+#  TODO: Centralize duedate.
+#
+
 sub duedate {
     (my $self, my $part) = @_;
-    return $self->parmval("duedate", $part);
+    if (defined ($self->{DUEDATE_CACHE}->{$part})) {
+        return $self->{DUEDATE_CACHE}->{$part};
+    }
+    my $date;
+    my @interval=$self->parmval("interval", $part);
+    my $due_date=$self->parmval("duedate", $part);
+    if ($interval[0] =~ /^(\d+)/) {
+        my $timelimit = $1;
+        my $first_access=&Apache::lonnet::get_first_access($interval[1],
+                                                           $self->{SYMB});
+	if (defined($first_access)) {
+            my $interval = $first_access+$timelimit;
+	    $date = (!$due_date || $interval < $due_date) ? $interval 
+                                                          : $due_date;
+	} else {
+	    $date = $due_date;
+	}
+    } else {
+	$date = $due_date;
+    }
+    $self->{DUEDATE_CACHE}->{$part} = $date;
+    return $date;
+}
+sub handgrade {
+    (my $self, my $part) = @_;
+    my @response_ids = $self->responseIds($part);
+    if (@response_ids) {
+	foreach my $response_id (@response_ids) {
+            my $handgrade = $self->parmval("handgrade",$part.'_'.$response_id);
+	    if (lc($handgrade) eq 'yes') {
+		return 'yes';
+	    }
+	}
+    }
+    my $handgrade = $self->parmval("handgrade", $part);
+    return $handgrade;
 }
 sub maxtries {
     (my $self, my $part) = @_;
-    return $self->parmval("maxtries", $part);
+    my $maxtries = $self->parmval("maxtries", $part);
+    return $maxtries;
 }
 sub opendate {
     (my $self, my $part) = @_;
-    if ($self->parmval("opendate.type", $part) eq 'date_interval') {
-        return $self->duedate($part) -
-            $self->parmval("opendate", $part);
+    my $opendatetype = $self->parmval("opendate.type", $part);
+    my $opendate = $self->parmval("opendate", $part); 
+    if ($opendatetype eq 'date_interval') {
+        my $duedate = $self->duedate($part);
+        $opendate = $duedate - $opendate; 
     }
-    return $self->parmval("opendate");
+    return $opendate;
+}
+sub problemstatus {
+    (my $self, my $part) = @_;
+    my $problemstatus = $self->parmval("problemstatus", $part);
+    return lc($problemstatus);
 }
 sub sig {
     (my $self, my $part) = @_;
-    return $self->parmval("sig", $part);
+    my $sig = $self->parmval("sig", $part);
+    return $sig;
 }
 sub tol {
     (my $self, my $part) = @_;
-    return $self->parmval("tol", $part);
+    my $tol = $self->parmval("tol", $part);
+    return $tol;
 }
-sub tries { 
+sub tries {
     my $self = shift; 
     my $tries = $self->queryRestoreHash('tries', shift);
     if (!defined($tries)) { return '0';}
@@ -2171,11 +5159,75 @@ sub tries {
 }
 sub type {
     (my $self, my $part) = @_;
-    return $self->parmval("type", $part);
+    my $type = $self->parmval("type", $part);
+    return $type;
 }
 sub weight { 
     my $self = shift; my $part = shift;
-    return $self->parmval("weight", $part);
+    if (!defined($part)) { $part = '0'; }
+    my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
+                                $self->{SYMB}, $self->{DOMAIN},
+                                $self->{USERNAME},
+                                $env{'request.course.sec'});
+    return $weight;
+}
+sub part_display {
+    my $self= shift(); my $partID = shift();
+    if (! defined($partID)) { $partID = '0'; }
+    my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
+                                     $self->{SYMB});
+    if (! defined($display) || $display eq '') {
+        $display = $partID;
+    }
+    return $display;
+}
+sub slot_control {
+    my $self=shift(); my $part = shift();
+    if (!defined($part)) { $part = '0'; }
+    my $useslots = $self->parmval("useslots", $part);
+    my $availablestudent = $self->parmval("availablestudent", $part);
+    my $available = $self->parmval("available", $part); 
+    return ($useslots,$availablestudent,$available);
+}
+sub deeplink {
+    my ($self,$caller,$action) = @_;
+    my $deeplink = $self->parmval("deeplink");
+    if ($deeplink) {
+        my ($state,$others,$listed,$scope) = split(/,/,$deeplink);
+        if ($action eq 'getlisted') {
+            return $listed;
+        }
+        if ($env{'request.deeplink.login'}) {
+            my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+            my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+            my $deeplink_symb = &Apache::loncommon::deeplink_login_symb($cnum,$cdom);
+            if ($deeplink_symb) {
+                my ($loginmap,$mapname);
+                if ($deeplink_symb =~ /\.(page|sequence)$/) {
+                    $mapname = $self->enclosing_map_src();
+                    $loginmap = &Apache::lonnet::clutter((&Apache::lonnet::decode_symb($deeplink_symb))[2]);
+                    return if ($mapname eq $loginmap);
+                } else {
+                    return if ($deeplink_symb eq $self->symb());
+                    if (($scope eq 'map') || ($scope eq 'rec')) {
+                        $mapname = $self->enclosing_map_src();
+                        $loginmap = &Apache::lonnet::clutter((&Apache::lonnet::decode_symb($deeplink_symb))[0]);
+                        return if ($mapname eq $loginmap);
+                    }
+                }
+                if ($scope eq 'rec') {
+                    my $map_pc = $self->navHash('map_pc_'.$mapname);
+                    my @recurseup = split(/,/,$self->navHash('map_hierarchy_'.$map_pc));
+                    my $login_pc = $self->navHash('map_pc_'.$loginmap);
+                    return if (grep(/^\Q$login_pc\E$/,@recurseup));
+                }
+            }
+        }
+        unless (($caller eq 'sequence') || ($state eq 'both')) {
+            return $listed;
+        }
+    }
+    return;
 }
 
 # Multiple things need this
@@ -2183,8 +5235,14 @@ sub getReturnHash {
     my $self = shift;
     
     if (!defined($self->{RETURN_HASH})) {
-        my %tmpHash  = &Apache::lonnet::restore($self->symb());
-        $self->{RETURN_HASH} = \%tmpHash;
+        #my %tmpHash  = &Apache::lonnet::restore($self->{SYMB},undef,$self->{DOMAIN},$self->{USERNAME});
+        #$self->{RETURN_HASH} = \%tmpHash;
+        # When info is retrieved for several resources (as when rendering a directory),
+        # it is much faster to use the user profile dump and avoid repeated lonnet requests
+        # (especially since lonnet::currentdump is using Lond directly whenever possible,
+        # and lonnet::restore is not at this point).
+        $self->{NAV_MAP}->get_user_data();
+        $self->{RETURN_HASH} = $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}};
     }
 }       
 
@@ -2210,12 +5268,36 @@ Misc. functions for the resource.
 
 =over 4
 
-=item * B<hasDiscussion>: Returns a false value if there has been discussion since the user last logged in, true if there has. Always returns false if the discussion data was not extracted when the nav map was constructed.
+=item * B<hasDiscussion>:
+
+Returns a false value if there has been discussion since the user last
+logged in, true if there has. Always returns false if the discussion
+data was not extracted when the nav map was constructed.
+
+=item * B<last_post_time>:
+
+Returns a false value if there hasn't been discussion otherwise returns
+unix timestamp of last time a discussion posting (or edit) was made.
+
+=item * B<discussion_info>:
+
+optional argument is a filter (currently can be 'unread');
+returns in scalar context the count of the number of discussion postings.
 
-=item * B<getFeedback>: Gets the feedback for the resource and returns the raw feedback string for the resource, or the null string if there is no feedback or the email data was not extracted when the nav map was constructed. Usually used like this:
+returns in list context both the count of postings and a hash ref
+containing information about the postings (subject, id, timestamp) in a hash.
 
- for (split(/\,/, $res->getFeedback())) {
-    my $link = &Apache::lonnet::escape($_);
+Default is to return counts for all postings.  However if called with a second argument set to 'unread', will return information about only unread postings.
+
+=item * B<getFeedback>:
+
+Gets the feedback for the resource and returns the raw feedback string
+for the resource, or the null string if there is no feedback or the
+email data was not extracted when the nav map was constructed. Usually
+used like this:
+
+ for my $url (split(/\,/, $res->getFeedback())) {
+    my $link = &escape($url);
     ...
 
 and use the link as appropriate.
@@ -2224,19 +5306,74 @@ and use the link as appropriate.
 
 sub hasDiscussion {
     my $self = shift;
-    return $self->{NAV_MAP}->hasDiscussion($self->symb());
+    return $self->{NAV_MAP}->hasDiscussion($self->{SYMB});
+}
+
+sub last_post_time {
+    my $self = shift;
+    return $self->{NAV_MAP}->last_post_time($self->{SYMB});
+}
+
+sub discussion_info {
+    my ($self,$filter) = @_;
+    return $self->{NAV_MAP}->discussion_info($self->{SYMB},$filter);
 }
 
 sub getFeedback {
     my $self = shift;
-    return $self->{NAV_MAP}->getFeedback($self->src());
+    my $source = $self->src();
+    my $symb = $self->{SYMB};
+    if ($source =~ /^\/res\//) { $source = substr $source, 5; }
+    return $self->{NAV_MAP}->getFeedback($symb,$source);
+}
+
+sub getErrors {
+    my $self = shift;
+    my $source = $self->src();
+    my $symb = $self->{SYMB};
+    if ($source =~ /^\/res\//) { $source = substr $source, 5; }
+    return $self->{NAV_MAP}->getErrors($symb,$source);
 }
 
 =pod
 
-=item * B<parts>(): Returns a list reference containing sorted strings corresponding to each part of the problem. To count the number of parts, use the list in a scalar context, and subtract one if greater then two. (One part problems have a part 0. Multi-parts have a part 0, plus a part for each part. Filtering part 0 if you want it is up to you.)
+=item * B<parts>():
+
+Returns a list reference containing sorted strings corresponding to
+each part of the problem. Single part problems have only a part '0'.
+Multipart problems do not return their part '0', since they typically
+do not really matter. 
+
+=item * B<countParts>():
+
+Returns the number of parts of the problem a student can answer. Thus,
+for single part problems, returns 1. For multipart, it returns the
+number of parts in the problem, not including psuedo-part 0. 
+
+=item * B<countResponses>():
+
+Returns the total number of responses in the problem a student can answer.
 
-=item * B<countParts>(): Returns the number of parts of the problem a student can answer. Thus, for single part problems, returns 1. For multipart, it returns the number of parts in the problem, not including psuedo-part 0. Thus, B<parts> may return an array with fewer parts in it then countParts might lead you to believe.
+=item * B<responseTypes>():
+
+Returns a hash whose keys are the response types.  The values are the number 
+of times each response type is used.  This is for the I<entire> problem, not 
+just a single part.
+
+=item * B<multipart>():
+
+Returns true if the problem is multipart, false otherwise. Use this instead
+of countParts if all you want is multipart/not multipart.
+
+=item * B<responseType>($part):
+
+Returns the response type of the part, without the word "response" on the
+end. Example return values: 'string', 'essay', 'numeric', etc.
+
+=item * B<responseIds>($part):
+
+Retreives the response IDs for the given part as an array reference containing
+strings naming the response IDs. This may be empty.
 
 =back
 
@@ -2245,7 +5382,9 @@ sub getFeedback {
 sub parts {
     my $self = shift;
 
-    if ($self->ext) { return ['0']; }
+    if ($self->ext) { return []; }
+    if (($self->is_tool()) &&
+        ($self->is_gradable())) { return ['0']; }
 
     $self->extractParts();
     return $self->{PARTS};
@@ -2256,43 +5395,195 @@ sub countParts {
     
     my $parts = $self->parts();
 
+    # If I left this here, then it's not necessary.
+    #my $delta = 0;
+    #for my $part (@$parts) {
+    #    if ($part eq '0') { $delta--; }
+    #}
+
     if ($self->{RESOURCE_ERROR}) {
         return 0;
     }
 
-    if (scalar(@{$parts}) < 2) { return 1;}
+    return scalar(@{$parts}); # + $delta;
+}
+
+sub countResponses {
+    my $self = shift;
+    my $count;
+    foreach my $part (@{$self->parts()}) {
+        $count+= scalar($self->responseIds($part));
+    }
+    return $count;
+}
+
+sub responseTypes {
+    my $self = shift;
+    my %responses;
+    foreach my $part (@{$self->parts()}) {
+        foreach my $responsetype ($self->responseType($part)) {
+            $responses{$responsetype}++ if (defined($responsetype));
+        }
+    }
+    return %responses;
+}
+
+sub multipart {
+    my $self = shift;
+    return $self->countParts() > 1;
+}
+
+sub singlepart {
+    my $self = shift;
+    return $self->countParts() == 1;
+}
+
+sub responseType {
+    my $self = shift;
+    my $part = shift;
+
+    $self->extractParts();
+    if (defined($self->{RESPONSE_TYPES}->{$part})) {
+	return @{$self->{RESPONSE_TYPES}->{$part}};
+    } else {
+	return undef;
+    }
+}
+
+sub responseIds {
+    my $self = shift;
+    my $part = shift;
 
-    return scalar(@{$parts}) - 1;
+    $self->extractParts();
+    if (defined($self->{RESPONSE_IDS}->{$part})) {
+	return @{$self->{RESPONSE_IDS}->{$part}};
+    } else {
+	return undef;
+    }
 }
 
-# Private function: Extracts the parts information and saves it
+# Private function: Extracts the parts information, both part names and
+# part types, and saves it. 
 sub extractParts { 
     my $self = shift;
     
-    return if ($self->{PARTS});
+    return if (defined($self->{PARTS}));
     return if ($self->ext);
 
     $self->{PARTS} = [];
 
+    my %parts;
+
     # Retrieve part count, if this is a problem
-    if ($self->is_problem()) {
-        my $metadata = &Apache::lonnet::metadata($self->src(), 'allpossiblekeys');
-        if (!$metadata) {
-            $self->{RESOURCE_ERROR} = 1;
-            $self->{PARTS} = [];
-            return;
+    if ($self->is_raw_problem()) {
+	my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
+        my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
+
+	if ($partorder) {
+	    my @parts;
+	    for my $part (split (/,/,$partorder)) {
+		if (!Apache::loncommon::check_if_partid_hidden($part, $self->{SYMB})) {
+		    push @parts, $part;
+		    $parts{$part} = 1;
+		}
+	    }
+	    $self->{PARTS} = \@parts;
+	} else {
+	    if (!$metadata) {
+		$self->{RESOURCE_ERROR} = 1;
+		$self->{PARTS} = [];
+		$self->{PART_TYPE} = {};
+		return;
+	    }
+	    foreach my $entry (split(/\,/,$metadata)) {
+		if ($entry =~ /^(?:part|Task)_(.*)$/) {
+		    my $part = $1;
+		    # This floods the logs if it blows up
+		    if (defined($parts{$part})) {
+			&Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->{SYMB});
+		    }
+		    
+		    # check to see if part is turned off.
+		    
+		    if (!Apache::loncommon::check_if_partid_hidden($part, $self->{SYMB})) {
+			$parts{$part} = 1;
+		    }
+		}
+	    }
+	    my @sortedParts = sort(keys(%parts));
+	    $self->{PARTS} = \@sortedParts;
         }
         
-        foreach (split(/\,/,$metadata)) {
-            if ($_ =~ /^parameter\_(.*)\_opendate$/) {
-                push @{$self->{PARTS}}, $1;
+
+        # These hashes probably do not need names that end with "Hash"....
+        my %responseIdHash;
+        my %responseTypeHash;
+
+
+        # Init the responseIdHash
+        foreach my $part (@{$self->{PARTS}}) {
+            $responseIdHash{$part} = [];
+        }
+
+        # Now, the unfortunate thing about this is that parts, part name, and
+        # response id are delimited by underscores, but both the part
+        # name and response id can themselves have underscores in them.
+        # So we have to use our knowlege of part names to figure out 
+        # where the part names begin and end, and even then, it is possible
+        # to construct ambiguous situations.
+        foreach my $data (split(/,/, $metadata)) {
+            if ($data =~ /^([a-zA-Z]+)response_(.*)/
+		|| $data =~ /^(Task)_(.*)/) {
+                my $responseType = $1;
+                my $partStuff = $2;
+                my $partIdSoFar = '';
+                my @partChunks = split(/_/, $partStuff);
+                my $i = 0;
+                for ($i = 0; $i < scalar(@partChunks); $i++) {
+                    if ($partIdSoFar) { $partIdSoFar .= '_'; }
+                    $partIdSoFar .= $partChunks[$i];
+                    if ($parts{$partIdSoFar}) {
+                        my @otherChunks = @partChunks[$i+1..$#partChunks];
+                        my $responseId = join('_', @otherChunks);
+			if ($self->is_task()) {
+			    push(@{$responseIdHash{$partIdSoFar}},
+				 $partIdSoFar);
+			} else {
+			    push(@{$responseIdHash{$partIdSoFar}},
+				 $responseId);
+			}
+                        push(@{$responseTypeHash{$partIdSoFar}},
+			     $responseType);
+                    }
+                }
             }
         }
-        
-        
-        # Is this possible to do in one line? - Jeremy
-        my @sortedParts = sort @{$self->{PARTS}};
-        $self->{PARTS} = \@sortedParts;
+	my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
+        #
+        # Reorder the arrays in the %responseIdHash and %responseTypeHash
+	if ($resorder) {
+	    my @resorder=split(/,/,$resorder);
+	    foreach my $part (keys(%responseIdHash)) {
+		my $i=0;
+		my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
+		my @neworder;
+		foreach my $possibleid (@resorder) {
+		    if (exists($resids{$possibleid})) {
+			push(@neworder,$resids{$possibleid});
+		    }
+		}
+		my @ids;
+		my @type;
+		foreach my $element (@neworder) {
+		    push (@ids,$responseIdHash{$part}->[$element]);
+		    push (@type,$responseTypeHash{$part}->[$element]);
+		}
+		$responseIdHash{$part}=\@ids;
+		$responseTypeHash{$part}=\@type;
+	    }
+	}
+        $self->{RESPONSE_IDS} = \%responseIdHash;
+        $self->{RESPONSE_TYPES} = \%responseTypeHash;
     }
 
     return;
@@ -2302,30 +5593,40 @@ sub extractParts {
 
 =head2 Resource Status
 
-Problem resources have status information, reflecting their various dates and completion statuses. 
+Problem resources have status information, reflecting their various
+dates and completion statuses.
 
-There are two aspects to the status: the date-related information and the completion information.
+There are two aspects to the status: the date-related information and
+the completion information.
 
-Idiomatic usage of these two methods would probably look something like
+Idiomatic usage of these two methods would probably look something
+like
 
- foreach ($resource->parts()) {
-    my $dateStatus = $resource->getDateStatus($_);
-    my $completionStatus = $resource->getCompletionStatus($_);
+ foreach my $part ($resource->parts()) {
+    my $dateStatus = $resource->getDateStatus($part);
+    my $completionStatus = $resource->getCompletionStatus($part);
 
     or
 
-    my $status = $resource->status($_);
+    my $status = $resource->status($part);
 
     ... use it here ...
  }
 
-Which you use depends on exactly what you are looking for. The status() function has been optimized for the nav maps display and may not precisely match what you need elsewhere.
+Which you use depends on exactly what you are looking for. The
+status() function has been optimized for the nav maps display and may
+not precisely match what you need elsewhere.
 
-The symbolic constants shown below can be accessed through the resource object: $res->OPEN.
+The symbolic constants shown below can be accessed through the
+resource object: C<$res->OPEN>.
 
 =over 4
 
-=item * B<getDateStatus>($part): ($part defaults to 0). A convenience function that returns a symbolic constant telling you about the date status of the part. The possible return values are:
+=item * B<getDateStatus>($part):
+
+($part defaults to 0). A convenience function that returns a symbolic
+constant telling you about the date status of the part. The possible
+return values are:
 
 =back
 
@@ -2333,18 +5634,30 @@ B<Date Codes>
 
 =over 4
 
-=item * B<OPEN_LATER>: The problem will be opened later.
+=item * B<OPEN_LATER>:
+
+The problem will be opened later.
+
+=item * B<OPEN>:
+
+Open and not yet due.
+
+
+=item * B<PAST_DUE_ANSWER_LATER>:
+
+The due date has passed, but the answer date has not yet arrived.
 
-=item * B<OPEN>: Open and not yet due.
+=item * B<PAST_DUE_NO_ANSWER>:
 
+The due date has passed and there is no answer opening date set.
 
-=item * B<PAST_DUE_ANSWER_LATER>: The due date has passed, but the answer date has not yet arrived.
+=item * B<ANSWER_OPEN>:
 
-=item * B<PAST_DUE_NO_ANSWER>: The due date has passed and there is no answer opening date set.
+The answer date is here.
 
-=item * B<ANSWER_OPEN>: The answer date is here.
+=item * B<NETWORK_FAILURE>:
 
-=item * B<NETWORK_FAILURE>: The information is unknown due to network failure.
+The information is unknown due to network failure.
 
 =back
 
@@ -2356,7 +5669,7 @@ sub OPEN                   { return 1; }
 sub PAST_DUE_NO_ANSWER     { return 2; }
 sub PAST_DUE_ANSWER_LATER  { return 3; }
 sub ANSWER_OPEN            { return 4; }
-sub NOTHING_SET            { return 5; } 
+sub NOTHING_SET            { return 5; }
 sub NETWORK_FAILURE        { return 100; }
 
 # getDateStatus gets the date status for a given problem part. 
@@ -2398,29 +5711,61 @@ B<>
 
 =over 4
 
-=item * B<getCompletionStatus>($part): ($part defaults to 0.) A convenience function that returns a symbolic constant telling you about the completion status of the part, with the following possible results:
+=item * B<getCompletionStatus>($part):
 
-=back 
+($part defaults to 0.) A convenience function that returns a symbolic
+constant telling you about the completion status of the part, with the
+following possible results:
+
+=back
 
 B<Completion Codes>
 
 =over 4
 
-=item * B<NOT_ATTEMPTED>: Has not been attempted at all.
+=item * B<NOT_ATTEMPTED>:
+
+Has not been attempted at all.
+
+=item * B<INCORRECT>:
+
+Attempted, but wrong by student.
+
+=item * B<INCORRECT_BY_OVERRIDE>:
+
+Attempted, but wrong by instructor override.
+
+=item * B<CORRECT>:
+
+Correct or correct by instructor.
+
+=item * B<CORRECT_BY_OVERRIDE>:
+
+Correct by instructor override.
 
-=item * B<INCORRECT>: Attempted, but wrong by student.
+=item * B<EXCUSED>:
 
-=item * B<INCORRECT_BY_OVERRIDE>: Attempted, but wrong by instructor override.
+Excused. Not yet implemented.
 
-=item * B<CORRECT>: Correct or correct by instructor.
+=item * B<NETWORK_FAILURE>:
 
-=item * B<CORRECT_BY_OVERRIDE>: Correct by instructor override.
+Information not available due to network failure.
 
-=item * B<EXCUSED>: Excused. Not yet implemented.
+=item * B<ATTEMPTED>:
 
-=item * B<NETWORK_FAILURE>: Information not available due to network failure.
+Attempted, and not yet graded.
 
-=item * B<ATTEMPTED>: Attempted, and not yet graded.
+=item * B<CREDIT_ATTEMPTED>:
+
+Attempted, and credit received for attempt (survey and anonymous survey only).
+
+=item * B<INCORRECT_BY_PASSBACK>:
+
+Attempted, but wrong for LTI Tool Provider by passback of grade
+
+=item * B<CORRECT_BY_PASSBACK>:
+
+Correct for LTI Tool Provider by passback of grade
 
 =back
 
@@ -2433,20 +5778,38 @@ sub CORRECT               { return 13; }
 sub CORRECT_BY_OVERRIDE   { return 14; }
 sub EXCUSED               { return 15; }
 sub ATTEMPTED             { return 16; }
+sub CREDIT_ATTEMPTED      { return 17; }
+sub INCORRECT_BY_PASSBACK { return 18; }
+sub CORRECT_BY_PASSBACK   { return 19; }
 
 sub getCompletionStatus {
     my $self = shift;
+    my $part = shift;
     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
 
-    my $status = $self->queryRestoreHash('solved', shift);
+    my $status = $self->queryRestoreHash('solved', $part);
 
-    # Left as seperate if statements in case we ever do more with this
+    # Left as separate if statements in case we ever do more with this
     if ($status eq 'correct_by_student') {return $self->CORRECT;}
-    if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
+    if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
+    if ($status eq 'correct_by_override') {
+	return $self->CORRECT_BY_OVERRIDE;
+    }
+    if ($status eq 'correct_by_passback') {
+        return $self->CORRECT_BY_PASSBACK;
+    }
     if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
     if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
+    if ($status eq 'incorrect_by_passback') {return $self->INCORRECT_BY_PASSBACK; }
     if ($status eq 'excused') {return $self->EXCUSED; }
     if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
+    if ($status eq 'credit_attempted') {
+        if ($self->is_anonsurvey($part) || $self->is_survey($part)) {
+            return $self->CREDIT_ATTEMPTED;
+        } else {
+            return $self->ATTEMPTED;
+        }
+    }
     return $self->NOT_ATTEMPTED;
 }
 
@@ -2454,7 +5817,7 @@ sub queryRestoreHash {
     my $self = shift;
     my $hashentry = shift;
     my $part = shift;
-    $part = "0" if (!defined($part));
+    $part = "0" if (!defined($part) || $part eq '');
     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
 
     $self->getReturnHash();
@@ -2466,39 +5829,102 @@ sub queryRestoreHash {
 
 B<Composite Status>
 
-Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE):
+Along with directly returning the date or completion status, the
+resource object includes a convenience function B<status>() that will
+combine the two status tidbits into one composite status that can
+represent the status of the resource as a whole. This method represents
+the concept of the thing we want to display to the user on the nav maps
+screen, which is a combination of completion and open status. The precise logic is
+documented in the comments of the status method. The following results
+may be returned, all available as methods on the resource object
+($res->NETWORK_FAILURE): In addition to the return values that match
+the date or completion status, this function can return "ANSWER_SUBMITTED"
+if that problemstatus parameter value is set to No, suppressing the
+incorrect/correct feedback.
 
 =over 4
 
-=item * B<NETWORK_FAILURE>: The network has failed and the information is not available.
+=item * B<NETWORK_FAILURE>:
+
+The network has failed and the information is not available.
+
+=item * B<NOTHING_SET>:
+
+No dates have been set for this problem (part) at all. (Because only
+certain parts of a multi-part problem may be assigned, this can not be
+collapsed into "open later", as we do not know a given part will EVER
+be opened. For single part, this is the same as "OPEN_LATER".)
+
+=item * B<CORRECT>:
+
+For any reason at all, the part is considered correct.
+
+=item * B<EXCUSED>:
+
+For any reason at all, the problem is excused.
+
+=item * B<PAST_DUE_NO_ANSWER>:
+
+The problem is past due, not considered correct, and no answer date is
+set.
+
+=item * B<PAST_DUE_ANSWER_LATER>:
 
-=item * B<NOTHING_SET>: No dates have been set for this problem (part) at all. (Because only certain parts of a multi-part problem may be assigned, this can not be collapsed into "open later", as we don't know a given part will EVER be opened. For single part, this is the same as "OPEN_LATER".)
+The problem is past due, not considered correct, and an answer date in
+the future is set.
 
-=item * B<CORRECT>: For any reason at all, the part is considered correct.
+=item * B<ANSWER_OPEN>:
 
-=item * B<EXCUSED>: For any reason at all, the problem is excused.
+The problem is past due, not correct, and the answer is now available.
 
-=item * B<PAST_DUE_NO_ANSWER>: The problem is past due, not considered correct, and no answer date is set.
+=item * B<OPEN_LATER>:
 
-=item * B<PAST_DUE_ANSWER_LATER>: The problem is past due, not considered correct, and an answer date in the future is set.
+The problem is not yet open.
 
-=item * B<ANSWER_OPEN>: The problem is past due, not correct, and the answer is now available.
+=item * B<TRIES_LEFT>:
 
-=item * B<OPEN_LATER>: The problem is not yet open.
+The problem is open, has been tried, is not correct, but there are
+tries left.
 
-=item * B<TRIES_LEFT>: The problem is open, has been tried, is not correct, but there are tries left.
+=item * B<INCORRECT>:
 
-=item * B<INCORRECT>: The problem is open, and all tries have been used without getting the correct answer.
+The problem is open, and all tries have been used without getting the
+correct answer.
 
-=item * B<OPEN>: The item is open and not yet tried.
+=item * B<OPEN>:
 
-=item * B<ATTEMPTED>: The problem has been attempted.
+The item is open and not yet tried.
+
+=item * B<ATTEMPTED>:
+
+The problem has been attempted.
+
+=item * B<CREDIT_ATTEMPTED>:
+
+The problem has been attempted, and credit given for the attempt (survey and anonymous survey only).
+
+=item * B<ANSWER_SUBMITTED>:
+
+An answer has been submitted, but the student should not see it.
 
 =back
 
 =cut
 
-sub TRIES_LEFT { return 10; }
+sub TRIES_LEFT        { return 20; }
+sub ANSWER_SUBMITTED  { return 21; }
+sub PARTIALLY_CORRECT { return 22; }
+
+sub RESERVED_LATER    { return 30; }
+sub RESERVED          { return 31; }
+sub RESERVED_LOCATION { return 32; }
+sub RESERVABLE        { return 33; }
+sub RESERVABLE_LATER  { return 34; }
+sub NOTRESERVABLE     { return 35; }
+sub NOT_IN_A_SLOT     { return 36; }
+sub NEEDS_CHECKIN     { return 37; }
+sub WAITING_FOR_GRADE { return 38; }
+sub UNKNOWN           { return 39; }
 
 sub status {
     my $self = shift;
@@ -2511,18 +5937,51 @@ sub status {
     # dimension and 5 entries on the other, which we want to colorize,
     # plus network failure and "no date data at all".
 
+    #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
     if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
 
+    my $suppressFeedback = 0;
+    if (($self->problemstatus($part) eq 'no') ||
+        ($self->problemstatus($part) eq 'no_feedback_ever')) {
+        $suppressFeedback = 1;
+    }
+    # If there's an answer date and we're past it, don't
+    # suppress the feedback; student should know
+    if ($self->duedate($part) && $self->duedate($part) < time() &&
+	$self->answerdate($part) && $self->answerdate($part) < time()) {
+	$suppressFeedback = 0;
+    }
+
     # There are a few whole rows we can dispose of:
     if ($completionStatus == CORRECT ||
-        $completionStatus == CORRECT_BY_OVERRIDE ) {
-        return CORRECT; 
+        $completionStatus == CORRECT_BY_OVERRIDE ||
+        $completionStatus == CORRECT_BY_PASSBACK ) {
+	if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
+	my $awarded=$self->awarded($part);
+	if ($awarded < 1 && $awarded > 0) {
+            return PARTIALLY_CORRECT;
+	} elsif ($awarded<1) {
+	    return INCORRECT;
+	}
+	return CORRECT; 
+    }
+
+    # If it's WRONG... and not open
+    if ( ($completionStatus == INCORRECT || 
+	  $completionStatus == INCORRECT_BY_OVERRIDE ||
+	  $completionStatus == INCORRECT_BY_PASSBACK)
+	 && (!$self->opendate($part) ||  $self->opendate($part) > time()) ) {
+	return INCORRECT;
     }
 
     if ($completionStatus == ATTEMPTED) {
         return ATTEMPTED;
     }
 
+    if ($completionStatus == CREDIT_ATTEMPTED) {
+        return CREDIT_ATTEMPTED;
+    }
+
     # If it's EXCUSED, then return that no matter what
     if ($completionStatus == EXCUSED) {
         return EXCUSED; 
@@ -2537,7 +5996,7 @@ sub status {
 
     if ($dateStatus == PAST_DUE_ANSWER_LATER ||
         $dateStatus == PAST_DUE_NO_ANSWER ) {
-        return $dateStatus; 
+        return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus; 
     }
 
     if ($dateStatus == ANSWER_OPEN) {
@@ -2552,16 +6011,363 @@ sub status {
     }
 
     # If it's WRONG...
-    if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
+    if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE ||
+        $completionStatus == INCORRECT_BY_PASSBACK) {
         # and there are TRIES LEFT:
         if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
-            return TRIES_LEFT;
+            return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
         }
-        return INCORRECT; # otherwise, return orange; student can't fix this
+        return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
     }
 
     # Otherwise, it's untried and open
-    return OPEN; 
+    return OPEN;
+}
+
+sub check_for_slot {
+    my $self = shift;
+    my $part = shift;
+    my $symb = $self->{SYMB};
+    my ($use_slots,$available,$availablestudent) = $self->slot_control($part);
+    if (($use_slots ne '') && ($use_slots !~ /^\s*no\s*$/i)) {
+        my @slots = (split(/:/,$availablestudent),split(/:/,$available));
+        my $cid=$env{'request.course.id'};
+        my $cdom=$env{'course.'.$cid.'.domain'};
+        my $cnum=$env{'course.'.$cid.'.num'};
+        my $now = time;
+        my $num_usable_slots = 0;
+        my ($checkedin,$checkedinslot,%consumed_uniq,%slots);
+        if (@slots > 0) {
+            %slots=&Apache::lonnet::get('slots',[@slots],$cdom,$cnum);
+            if (&Apache::lonnet::error(%slots)) {
+                return (UNKNOWN);
+            }
+            my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots,'starttime');
+            foreach my $slot_name (@sorted_slots) {
+                next if (!defined($slots{$slot_name}) || !ref($slots{$slot_name}));
+                my $end = $slots{$slot_name}->{'endtime'};
+                my $start = $slots{$slot_name}->{'starttime'};
+                my $ip = $slots{$slot_name}->{'ip'};
+                if ($self->simpleStatus() == OPEN) {
+                    if ($end > $now) {
+                        if ($start > $now) {
+                            return (RESERVED_LATER,$start,$slot_name);
+                        } else {
+                            if ($ip ne '') {
+                                if (!&Apache::loncommon::check_ip_acc($ip)) {
+                                    return (RESERVED_LOCATION,$end,$slot_name);
+                                }
+                            }
+                            my @proctors;
+                            if ($slots{$slot_name}->{'proctor'} ne '') {
+                                @proctors = split(',',$slots{$slot_name}->{'proctor'});
+                            }
+                            if (@proctors > 0) {
+                                ($checkedin,$checkedinslot) = $self->checkedin();
+                                unless ((grep(/^\Q$checkedin\E/,@proctors)) &&
+                                        ($checkedinslot eq $slot_name)) {
+                                    return (NEEDS_CHECKIN,$end,$slot_name); 
+                                }
+                            }
+                            return (RESERVED,$end,$slot_name);
+                        }
+                    }
+                } elsif ($end > $now) {
+                    $num_usable_slots ++;
+                }
+            }
+            my ($is_correct,$wait_for_grade);
+            if ($self->is_task()) {
+                my $taskstatus = $self->taskstatus();
+                $is_correct = (($taskstatus eq 'pass') || 
+                               ($self->solved() =~ /^correct_/));
+                unless ($taskstatus =~ /^(?:pass|fail)$/) {
+                    $wait_for_grade = 1;
+                }
+            } else {
+                unless ($self->completable()) {
+                    $wait_for_grade = 1;
+                }
+                unless (($self->problemstatus($part) eq 'no') ||
+                        ($self->problemstatus($part) eq 'no_feedback_ever')) {
+                    $is_correct = ($self->solved($part) =~ /^correct_/);
+                    $wait_for_grade = 0;
+                }
+            }
+            ($checkedin,$checkedinslot) = $self->checkedin();
+            if ($checkedin) {
+                if (ref($slots{$checkedinslot}) eq 'HASH') {
+                    $consumed_uniq{$checkedinslot} = $slots{$checkedinslot}{'uniqueperiod'};
+                }
+                if ($wait_for_grade) {
+                    return (WAITING_FOR_GRADE);
+                } elsif ($is_correct) {
+                    return (CORRECT); 
+                }
+            }
+            if ($num_usable_slots) {
+                return(NOT_IN_A_SLOT);
+            }
+        }
+        my $reservable = &Apache::lonnet::get_reservable_slots($cnum,$cdom,$env{'user.name'},
+                                                               $env{'user.domain'});
+        if (ref($reservable) eq 'HASH') {
+            my ($map) = &Apache::lonnet::decode_symb($symb);
+            if ((ref($reservable->{'now_order'}) eq 'ARRAY') && (ref($reservable->{'now'}) eq 'HASH')) {
+                foreach my $slot (reverse (@{$reservable->{'now_order'}})) {
+                    my $canuse;
+                    if ($reservable->{'now'}{$slot}{'symb'} eq '') {
+                        $canuse = 1;
+                    } else {
+                        my %oksymbs;
+                        my @slotsymbs = split(/\s*,\s*/,$reservable->{'now'}{$slot}{'symb'});
+                        map { $oksymbs{$_} = 1; } @slotsymbs;
+                        if ($oksymbs{$symb}) {
+                            $canuse = 1;
+                        } else {
+                            foreach my $item (@slotsymbs) {
+                                if ($item =~ /\.(page|sequence)$/) {
+                                    (undef,undef, my $sloturl) = &Apache::lonnet::decode_symb($item);
+                                    if (($map ne '') && ($map eq $sloturl)) {
+                                        $canuse = 1;
+                                        last;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                    if ($canuse) {
+                        if ($checkedin) {
+                            if (ref($consumed_uniq{$checkedinslot}) eq 'ARRAY') {
+                                my ($uniqstart,$uniqend)=@{$consumed_uniq{$checkedinslot}};
+                                if ($reservable->{'now'}{$slot}{'uniqueperiod'} =~ /^(\d+),(\d+)$/) {
+                                    my ($new_uniq_start,$new_uniq_end) = ($1,$2);
+                                    next if (!
+                                        ($uniqstart < $new_uniq_start && $uniqend < $new_uniq_start) ||
+                                        ($uniqstart > $new_uniq_end   &&  $uniqend > $new_uniq_end  ));
+                                }
+                            }
+                        }
+                        return(RESERVABLE,$reservable->{'now'}{$slot}{'endreserve'});
+                    }
+                }
+            }
+            if ((ref($reservable->{'future_order'}) eq 'ARRAY') && (ref($reservable->{'future'}) eq 'HASH')) {
+                foreach my $slot (@{$reservable->{'future_order'}}) {
+                    my $canuse;
+                    if ($reservable->{'future'}{$slot}{'symb'} eq '') {
+                        $canuse = 1;
+                    } elsif ($reservable->{'future'}{$slot}{'symb'} =~ /,/) {
+                        my %oksymbs;
+                        my @slotsymbs = split(/\s*,\s*/,$reservable->{'future'}{$slot}{'symb'});
+                        map { $oksymbs{$_} = 1; } @slotsymbs;
+                        if ($oksymbs{$symb}) {
+                            $canuse = 1;
+                        } else {
+                            foreach my $item (@slotsymbs) {
+                                if ($item =~ /\.(page|sequence)$/) {
+                                    (undef,undef, my $sloturl) = &Apache::lonnet::decode_symb($item);
+                                    if (($map ne '') && ($map eq $sloturl)) {
+                                        $canuse = 1;
+                                        last;
+                                    }
+                                }
+                            }
+                        }
+                    } elsif ($reservable->{'future'}{$slot}{'symb'} eq $symb) {
+                        $canuse = 1;
+                    }
+                    if ($canuse) {
+                        if ($checkedin) {
+                            if (ref($consumed_uniq{$checkedinslot}) eq 'ARRAY') {
+                                my ($uniqstart,$uniqend)=@{$consumed_uniq{$checkedinslot}};
+                                if ($reservable->{'future'}{$slot}{'uniqueperiod'} =~ /^(\d+),(\d+)$/) {
+                                    my ($new_uniq_start,$new_uniq_end) = ($1,$2);
+                                    next if (!
+                                        ($uniqstart < $new_uniq_start && $uniqend < $new_uniq_start) ||
+                                        ($uniqstart > $new_uniq_end   &&  $uniqend > $new_uniq_end  ));
+                                }
+                            }
+                        }
+                        return(RESERVABLE_LATER,$reservable->{'future'}{$slot}{'startreserve'});
+                    }
+                }
+            }
+        }
+        return(NOTRESERVABLE);
+    }
+    return;
+}
+
+sub CLOSED { return 23; }
+sub ERROR { return 24; }
+
+=pod
+
+B<Simple Status>
+
+Convenience method B<simpleStatus> provides a "simple status" for the resource.
+"Simple status" corresponds to "which icon is shown on the
+Navmaps". There are six "simple" statuses:
+
+=over 4
+
+=item * B<CLOSED>: The problem is currently closed. (No icon shown.)
+
+=item * B<OPEN>: The problem is open and unattempted.
+
+=item * B<CORRECT>: The problem is correct for any reason.
+
+=item * B<INCORRECT>: The problem is incorrect and can still be
+completed successfully.
+
+=item * B<ATTEMPTED>: The problem has been attempted, but the student
+does not know if they are correct. (The ellipsis icon.)
+
+=item * B<ERROR>: There is an error retrieving information about this
+problem.
+
+=back
+
+=cut
+
+# This hash maps the composite status to this simple status, and
+# can be used directly, if you like
+my %compositeToSimple = 
+    (
+      NETWORK_FAILURE()       => ERROR,
+      NOTHING_SET()           => CLOSED,
+      CORRECT()               => CORRECT,
+      PARTIALLY_CORRECT()     => PARTIALLY_CORRECT,
+      EXCUSED()               => CORRECT,
+      PAST_DUE_NO_ANSWER()    => INCORRECT,
+      PAST_DUE_ANSWER_LATER() => INCORRECT,
+      ANSWER_OPEN()           => INCORRECT,
+      OPEN_LATER()            => CLOSED,
+      TRIES_LEFT()            => OPEN,
+      INCORRECT()             => INCORRECT,
+      OPEN()                  => OPEN,
+      ATTEMPTED()             => ATTEMPTED,
+      CREDIT_ATTEMPTED()      => CORRECT,
+      ANSWER_SUBMITTED()      => ATTEMPTED
+     );
+
+sub simpleStatus {
+    my $self = shift;
+    my $part = shift;
+    my $status = $self->status($part);
+    return $compositeToSimple{$status};
+}
+
+=pod
+
+B<simpleStatusCount> will return an array reference containing, in
+this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
+and ERROR parts the given problem has.
+
+=cut
+    
+# This maps the status to the slot we want to increment
+my %statusToSlotMap = 
+    (
+     OPEN()      => 0,
+     CLOSED()    => 1,
+     CORRECT()   => 2,
+     INCORRECT() => 3,
+     ATTEMPTED() => 4,
+     ERROR()     => 5
+     );
+
+sub statusToSlot { return $statusToSlotMap{shift()}; }
+
+sub simpleStatusCount {
+    my $self = shift;
+
+    my @counts = (0, 0, 0, 0, 0, 0, 0);
+    foreach my $part (@{$self->parts()}) {
+	$counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
+    }
+
+    return \@counts;
+}
+
+=pod
+
+B<Completable>
+
+The completable method represents the concept of I<whether the student can
+currently do the problem>. If the student can do the problem, which means
+that it is open, there are tries left, and if the problem is manually graded
+or the grade is suppressed via problemstatus, the student has not tried it
+yet, then the method returns 1. Otherwise, it returns 0, to indicate that 
+either the student has tried it and there is no feedback, or that for
+some reason it is no longer completable (not open yet, successfully completed,
+out of tries, etc.). As an example, this is used as the filter for the
+"Uncompleted Homework" option for the nav maps.
+
+If this does not quite meet your needs, do not fiddle with it (unless you are
+fixing it to better match the student's conception of "completable" because
+it's broken somehow)... make a new method.
+
+=cut
+
+sub completable {
+    my $self = shift;
+    if (!$self->is_problem()) { return 0; }
+    my $partCount = $self->countParts();
+
+    foreach my $part (@{$self->parts()}) {
+        if ($part eq '0' && $partCount != 1) { next; }
+        my $status = $self->status($part);
+        # "If any of the parts are open, or have tries left (implies open),
+        # and it is not "attempted" (manually graded problem), it is
+        # not "complete"
+	if ($self->getCompletionStatus($part) == ATTEMPTED() ||
+            $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
+	    $status == ANSWER_SUBMITTED() ) {
+	    # did this part already, as well as we can
+	    next;
+	}
+	if ($status == OPEN() || $status == TRIES_LEFT()) {
+	    return 1;
+	}
+    }
+        
+    # If all the parts were complete, so was this problem.
+    return 0;
+}
+
+=pod
+
+B<Answerable>
+
+The answerable method differs from the completable method in its handling of problem parts
+for which feedback on correctness is suppressed, but the student still has tries left, and
+the problem part is not past due, (i.e., the student could submit a different answer if
+he/she so chose). For that case completable will return 0, whereas answerable will return 1.
+
+=cut
+
+sub answerable {
+    my $self = shift;
+    if (!$self->is_problem()) { return 0; }
+    my $partCount = $self->countParts();
+    foreach my $part (@{$self->parts()}) {
+        if ($part eq '0' && $partCount != 1) { next; }
+        my $status = $self->status($part);
+        if ($self->getCompletionStatus($part) == ATTEMPTED() ||
+            $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
+            $status == ANSWER_SUBMITTED() ) {
+            if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
+                return 1;
+            }
+        }
+        if ($status == OPEN() || $status == TRIES_LEFT() || $status == NETWORK_FAILURE()) {
+            return 1;
+        }
+    }
+    # None of the parts were answerable, so neither is this problem.
+    return 0;
 }
 
 =pod
@@ -2570,9 +6376,15 @@ sub status {
 
 =over 4
 
-=item * B<getNext>(): Retreive an array of the possible next resources after this one. Always returns an array, even in the one- or zero-element case. 
+=item * B<getNext>():
 
-=item * B<getPrevious>(): Retreive an array of the possible previous resources from this one. Always returns an array, even in the one- or zero-element case. 
+Retreive an array of the possible next resources after this
+one. Always returns an array, even in the one- or zero-element case.
+
+=item * B<getPrevious>():
+
+Retreive an array of the possible previous resources from this
+one. Always returns an array, even in the one- or zero-element case.
 
 =cut
 
@@ -2582,19 +6394,11 @@ sub getNext {
     my $to = $self->to();
     foreach my $branch ( split(/,/, $to) ) {
         my $choice = $self->{NAV_MAP}->getById($branch);
+        #if (!$choice->condition()) { next; }
         my $next = $choice->goesto();
         $next = $self->{NAV_MAP}->getById($next);
 
-        # Don't remember it if the student doesn't have browse priviledges
-        # future note: this may properly belong in the client of the resource
-        my $browsePriv = $self->{BROWSE_PRIV};
-        if (!defined($browsePriv)) {
-            $browsePriv = &Apache::lonnet::allowed('bre', $self->src);
-            $self->{BROWSE_PRIV} = $browsePriv;
-        }
-        if (!($browsePriv ne '2' && $browsePriv ne 'F')) {
-            push @branches, $next;
-        }
+        push @branches, $next;
     }
     return \@branches;
 }
@@ -2603,25 +6407,38 @@ sub getPrevious {
     my $self = shift;
     my @branches;
     my $from = $self->from();
-    foreach my $branch ( split /,/, $from) {
+    foreach my $branch ( split(/,/, $from)) {
         my $choice = $self->{NAV_MAP}->getById($branch);
         my $prev = $choice->comesfrom();
         $prev = $self->{NAV_MAP}->getById($prev);
 
-        # Don't remember it if the student doesn't have browse priviledges
-        # future note: this may properly belong in the client of the resource
-        my $browsePriv = $self->{BROWSE_PRIV};
-        if (!defined($browsePriv)) {
-            $browsePriv = &Apache::lonnet::allowed('bre', $self->src);
-            $self->{BROWSE_PRIV} = $browsePriv;
-        }
-        if (!($browsePriv ne '2' && $browsePriv ne 'F')) {
-            push @branches, $prev;
-        }
+        push @branches, $prev;
     }
     return \@branches;
 }
 
+sub browsePriv {
+    my $self = shift;
+    my $noblockcheck = shift;
+    my $deeplinklisted = shift;
+    if (defined($self->{BROWSE_PRIV})) {
+        return $self->{BROWSE_PRIV};
+    }
+    my ($nodeeplinkcheck,$nodeeplinkout);
+    if ($deeplinklisted) {
+        my $deeplink = $self->deeplink(undef,'getlisted');
+        if (($deeplink) && ($deeplink ne 'absent')) {
+            $nodeeplinkcheck = 1;
+        }
+        $nodeeplinkout = 1;
+    }
+    $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
+						    $self->{SYMB},undef,
+                                                    undef,$noblockcheck,
+                                                    undef,$nodeeplinkcheck,
+                                                    $nodeeplinkout);
+}
+
 =pod
 
 =back