--- loncom/interface/lonindexer.pm 2000/08/28 21:07:32 1.1 +++ loncom/interface/lonindexer.pm 2007/07/11 20:32:15 1.170 @@ -1,23 +1,100 @@ # The LearningOnline Network with CAPA # Directory Indexer -# (Login Screen -# 5/21/99,5/22,5/25,5/26,5/31,6/2,6/10,7/12,7/14 Gerd Kortemeyer) -# 11/23 Gerd Kortemeyer -# 07/20-08/04 H.K. Ng # +# $Id: lonindexer.pm,v 1.170 2007/07/11 20:32:15 albertel Exp $ +# +# Copyright Michigan State University Board of Trustees +# +# This file is part of the LearningOnline Network with CAPA (LON-CAPA). +# +# LON-CAPA is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# LON-CAPA is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with LON-CAPA; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# +# /home/httpd/html/adm/gpl.txt +# +# http://www.lon-capa.org/ +# +### + +############################################################################### +## ## +## ORGANIZATION OF THIS PERL MODULE ## +## ## +## 1. Description of functions ## +## 2. Modules used by this module ## +## 3. Choices for different output views (detailed, summary, xml, etc) ## +## 4. BEGIN block (to be run once after compilation) ## +## 5. Handling routine called via Apache and mod_perl ## +## 6. Other subroutines ## +## ## +############################################################################### + package Apache::lonindexer; +# ------------------------------------------------- modules used by this module use strict; -use Apache::lonnet(); +use Apache::lonnet; +use Apache::loncommon(); +use Apache::lonhtmlcommon(); +use Apache::lonsequence(); use Apache::Constants qw(:common); +use Apache::lonmeta; +use Apache::File; +use Apache::lonlocal; +use Apache::lonsource(); +use GDBM_File; +use LONCAPA qw(:match); + +# ---------------------------------------- variables used throughout the module +my %hash; # global user-specific gdbm file +my %dirs; # keys are directories, values are the open/close status +my %language; # has the reference information present in language.tab +my %dynhash; # hash of hashes for dynamic metadata +my %dynread; # hash of directories already read for dynamic metadata +my %fieldnames; # Metadata fieldnames +# ----- Values which are set by the handler subroutine and are accessible to +# ----- other methods. +my $extrafield; # default extra table cell +my $fnum; # file counter +my $dnum; # directory counter + +# ----- Used to include or exclude files with certain extensions. +my @Only = (); +my @Omit = (); + + + +# ----------------------------- Handling routine called via Apache and mod_perl sub handler { my $r = shift; - $r->content_type('text/html'); + my $c = $r->connection(); + &Apache::loncommon::content_type($r,'text/html'); + &Apache::loncommon::no_cache($r); $r->send_http_header; return OK if $r->header_only; + $fnum=0; + $dnum=0; + + # Deal with stupid global variables (is there a way around making + # these global to this package? It is just so wrong....) + undef (@Only); + undef (@Omit); + %fieldnames=&Apache::lonmeta::fieldnames(); - my $iconpath= $r->dir_config('lonIconsURL'); +# ------------------------------------- read in machine configuration variables + my $iconpath= $r->dir_config('lonIconsURL') . "/"; my $domain = $r->dir_config('lonDefDomain'); my $role = $r->dir_config('lonRole'); my $loadlim = $r->dir_config('lonLoadLim'); @@ -26,331 +103,1355 @@ sub handler { my $lonhost = $r->dir_config('lonHostID'); my $tabdir = $r->dir_config('lonTabDir'); -# ---------------------------------------------------------------- Print Header - $r->print(< - -The LearningOnline Network Directory Browser - - -ENDHEADER - + my $fileclr='#ffffe6'; my $line; my (@attrchk,@openpath); my $uri=$r->uri; - my $iconpath="/res/adm/pages/indexericons/"; - $r->print("

The LearningOnline Network Directory Browser

\n"); +# -------------------------------------- see if called from an interactive mode + # Get the parameters from the query string + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}, + ['catalogmode','launch','acts','mode','form','element', + 'only','omit','titleelement']); + #------------------------------------------------------------------- + my $closebutton=''; + my $groupimportbutton=''; + my $colspan=''; + + $extrafield=''; + my $diropendb = + "/home/httpd/perl/tmp/$env{'user.domain'}_$env{'user.name'}_sel_res.db"; + %hash = (); + { + my %dbfile; + if (tie(%dbfile,'GDBM_File',$diropendb,&GDBM_WRITER(),0640)) { + if ($env{'form.launch'} eq '1') { + &start_fresh_session(\%dbfile); + } + while(my($key,$value)=each(%dbfile)) { + $hash{$key}=$value; + } + untie(%dbfile); + } + } + { + #Hijack lonindexer to verify a title and be close down. + if ($env{'form.launch'} eq '2') { + &Apache::loncommon::content_type($r,'text/html'); + my $extra=''; + if (defined($env{'form.titleelement'}) && + $env{'form.titleelement'} ne '') { + my $verify_title = &Apache::lonnet::gettitle($env{'form.acts'}); +# &Apache::lonnet::logthis("Hrrm $env{'form.acts'} -- $verify_title"); + $verify_title=~s/'/\\'/g; + $extra='window.opener.document.forms["'.$env{'form.form'}.'"].elements["'.$env{'form.titleelement'}.'"].value=\''.$verify_title.'\';'; + } + my $js = < + function load() { + window.opener.document.forms["$env{'form.form'}"] + .elements["$env{'form.element'}"] + .value='$env{'form.acts'}'; + $extra + window.close(); + } + +ENDSUBM + $r->print(&Apache::loncommon::start_page(undef,$js, + {'only_body' =>1, + 'add_entries' => + {'onload' => "load();"},} + ). + &Apache::loncommon::end_page()); + return OK; + } + +# -------------------- refresh environment with user database values (in %hash) + &setvalues(\%hash,'form.catalogmode',\%env,'form.catalogmode' ); + +# --------------------- define extra fields and buttons in case of special mode + if ($env{'form.catalogmode'} eq 'interactive') { + $extrafield=''. + ''; + $colspan=" colspan='2' "; + my $cl=&mt('Close'); + $closebutton=< +END + } + elsif ($env{'form.catalogmode'} eq 'import') { + $extrafield=''. + ''; + $colspan=" colspan='2' "; + my $cl=&mt('Close'); + my $gi=&mt('Import'); + $closebutton=< +END + $groupimportbutton=< +END + } + # Additions made by Matthew to make the browser a little easier to deal + # with in the future. + # + # $mode (at this time) indicates if we are in edit mode. + # $form is the name of the form that the URL is placed when the + # selection is made. + # $element is the name of the element in $formname which receives + # the URL. + #&Apache::lonxml::debug('Checking mode, form, element'); + &setvalues(\%hash,'form.mode' ,\%env,'form.mode' ); + &setvalues(\%hash,'form.form' ,\%env,'form.form' ); + &setvalues(\%hash,'form.element' ,\%env,'form.element'); + &setvalues(\%hash,'form.titleelement',\%env,'form.titleelement'); + &setvalues(\%hash,'form.only' ,\%env,'form.only' ); + &setvalues(\%hash,'form.omit' ,\%env,'form.omit' ); + + # Deal with 'omit' and 'only' + if (exists $env{'form.omit'}) { + @Omit = split(',',$env{'form.omit'}); + } + if (exists $env{'form.only'}) { + @Only = split(',',$env{'form.only'}); + } + + my $mode = $env{'form.mode'}; + my ($form,$element,$titleelement); + if ($mode eq 'edit' || $mode eq 'parmset') { + $form = $env{'form.form'}; + $element = $env{'form.element'}; + $titleelement = $env{'form.titleelement'}; + } + #&Apache::lonxml::debug("mode=$mode form=$form element=$element titleelement=$titleelement"); +# ------ set catalogmodefunctions to have extra needed javascript functionality + my $catalogmodefunctions=''; + if ($env{'form.catalogmode'} eq 'interactive' or + $env{'form.catalogmode'} eq 'import') { + # The if statement below sets us up to use the old version + # by default (ie. if $mode is undefined). This is the easy + # way out. Hopefully in the future I'll find a way to get + # the calls dealt with in a more comprehensive manner. - for (my $i=0; $i<=5; $i++) { - $attrchk[$i] = "checked" if $ENV{'form.attr'.$i} == 1; +# +# There is now also mode "simple", which is for the simple version of the rat +# +# + if (!defined($mode) || ($mode ne 'edit' && $mode ne 'parmset')) { + my $location = "/adm/groupsort?&inhibitmenu=yes&catalogmode=import&"; + $location .= "mode=".$mode."&"; + $location .= "acts="; + $catalogmodefunctions=<<"END"; +function select_data(url) { + changeURL(url); + self.close(); +} +function select_group() { + window.location="$location"+document.forms.fileattr.acts.value; +} +function changeURL(val) { + if (opener.inf) { + if (opener.inf.document.forms.resinfo.elements.u) { + opener.inf.document.forms.resinfo.elements.u.value=val; + } } - $r->print(<Display file attributes
-
- - - - - - - - -
SizeLast accessLast modified
AuthorKeywordsLanguage
- - - -
+} END - my $titleclr="#ddffff"; - my $fileclr="#ffffdd"; + } elsif ($mode eq 'edit') { # we are in 'edit' mode + my $location = "/adm/groupsort?catalogmode=interactive&"; + $location .= "form=$form&element=$element&mode=edit&acts="; + $catalogmodefunctions=<print("
\n"); - $r->print("\n"); - $r->print("\n"); - $r->print("\n") if ($ENV{'form.attr0'} == 1); - $r->print("\n") if ($ENV{'form.attr1'} == 1); - $r->print("\n") if ($ENV{'form.attr2'} == 1); - $r->print(""); - - if ($ENV{'form.openuri'} =~ /$uri\&/) { - my @pathcom = split(/\//,$uri); - pop @pathcom; - my $splituri = join ('/',@pathcom); - $uri = join ('',$splituri,"/"); +function changeURL(val) { + if (window.opener.document) { + window.opener.document.forms["$form"].elements["$element"].value=val; + } else { + alert("The file you selected is: "+val); + } +} +END + if (!$titleelement) { + $catalogmodefunctions.='function changeTitle(val) {}'; + } else { + $catalogmodefunctions.=<print ("
openuri=$openuri
"); - $openuri =~ s/$uri(.*)\&//g; -# $r->print ("
parsed openuri=$openuri
"); - @openpath = split(/\&/,$openuri); -# $r->print ("
open path=@openpath
"); - push @openpath, $uri; -# $r->print ("
append current uri to open path=@openpath
"); - @openpath = sort @openpath; -# $r->print ("
sorted open path=@openpath
"); - - - my $indent = -1; - &display_line ($r,1,"/res/".$domain."&domain"); - &branch ($r,"/res/".$domain."/",$indent,@openpath); - - $r->print("
NameSize (bytes) Last accessedLast modified
"); - $r->print("
"); - $r->print("\n"); -# &display_env($r); +END + } + } + $catalogmodefunctions.=< +$catalogmodefunctions +function checkAll() { + var numForms = document.forms.length; + for (i=0;i +ENDHEADER + + my ($headerdom)=($uri=~m{^/res/($match_domain)/}); + $r->print(&Apache::loncommon::start_page('Browse Resources',$js, + {'domain' => $headerdom,})); +# - Evaluate actions from previous page (both cumulatively and chronologically) + if ($env{'form.catalogmode'} eq 'import') { + my $acts=$env{'form.acts'}; + my @Acts=split(/b/,$acts); + my %ahash; + my %achash; + my $ac=0; + # some initial hashes for working with data + foreach (@Acts) { + my ($state,$ref)=split(/a/); + $ahash{$ref}=$state; + $achash{$ref}=$ac; + $ac++; + } + # sorting through the actions and changing the global database hash + foreach my $key (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) { + if ($ahash{$key} eq '1') { + $hash{'store_'.$hash{'pre_'.$key.'_link'}}= + $hash{'pre_'.$key.'_title'}; + $hash{'storectr_'.$hash{'pre_'.$key.'_link'}}= + $hash{'storectr'}+0; + $hash{'storectr'}++; + } + if ($ahash{$key} eq '0') { + if ($hash{'store_'.$hash{'pre_'.$key.'_link'}}) { + delete $hash{'store_'.$hash{'pre_'.$key.'_link'}}; + } + } + } + # deleting the previously cached listing + foreach (keys %hash) { + if ($_ =~ /^pre_/ && $_ =~/link$/) { + my $key = $_; + $key =~ s/^pre_//; + $key =~ s/_[^_]*$//; + delete $hash{'pre_'.$key.'_title'}; + delete $hash{'pre_'.$key.'_link'}; + } + } + } + +# ---------------------------------- get state of file attributes to be showing + if ($env{'form.attrs'}) { + for (my $i=0; $i<=11; $i++) { + delete $hash{'display_attrs_'.$i}; + if ($env{'form.attr'.$i} == 1) { + $attrchk[$i] = 'checked'; + $hash{'display_attrs_'.$i} = 1; + } + } + } else { + for (my $i=0; $i<=11; $i++) { + $attrchk[$i] = 'checked' if $hash{'display_attrs_'.$i} == 1; + } + } + +# ------------------------------- output state of file attributes to be showing +# All versions has to the last item +# since it does not take an extra col + my %lt=&Apache::lonlocal::texthash( + 'ti' => 'Title', + 'si' => 'Size', + 'la' => 'Last access', + 'lm' => 'Last modified', + 'st' => 'Statistics', + 'au' => 'Author', + 'kw' => 'Keywords', + 'ln' => 'Language', + 'sa' => 'Source Available', + 'sr' => 'Show resource', + 'li' => 'Linked/Related Resources', + 'av' => 'All versions', + 'ud' => 'Update Display' + ); + $r->print(< + + + + + + + + + + + + + + + + + + + + +
 
+ + + +$closebutton $groupimportbutton +END + $r->print(&Apache::loncommon::inhibit_menu_check('input')); +# -------------- Filter out sequence containment in crumbs and "recent folders" + my $storeuri=$uri; + $storeuri='/'.(split(/\.(page|sequence)\/\//,$uri))[-1]; + $storeuri=~s/\/+/\//g; +# ---------------------------------------------------------------- Bread crumbs + $r->print(&Apache::lonhtmlcommon::crumbs($storeuri,'','', + (($env{'form.catalogmode'} eq 'import')? + 'document.forms.fileattr':'')). + &Apache::lonhtmlcommon::select_recent('residx','resrecent', +'window.status=this.form.resrecent.options[this.form.resrecent.selectedIndex].value;this.form.action=this.form.resrecent.options[this.form.resrecent.selectedIndex].value;this.form.submit();')); +# -------------------------------------------------------- Resource Home Button + my $reshome=$env{'course.'.$env{'request.course.id'}.'.reshome'}; + if ($reshome) { + $r->print("print('javascript:document.forms.fileattr.action="'.&Apache::loncommon::inhibit_menu_check($reshome).'";document.forms.fileattr.submit();'); + } else { + $r->print($reshome); + } + $r->print("'>".&mt('Home').''); + } + $r->print(''); +# ------------------------------------------------------ Remember where we were + &Apache::loncommon::storeresurl($storeuri); + &Apache::lonhtmlcommon::store_recent('residx',$storeuri,$storeuri); +# -------------------------------------------------- Check All and Uncheck all + $r->print('
'); + $r->print(''); +# ----------------- output starting row to the indexed file/directory hierarchy + my $titleclr="#ddffff"; + #$r->print(&initdebug()); + #$r->print(&writedebug("Omit:@Omit")) if (@Omit); + #$r->print(&writedebug("Only:@Only")) if (@Only); + $r->print('
'."\n"); + $r->print(''."\n"); + $r->print("\n"); + $r->print("\n") + if ($hash{'display_attrs_0'} == 1); + $r->print("\n") if ($hash{'display_attrs_1'} == 1); + $r->print("\n") + if ($hash{'display_attrs_2'} == 1); + $r->print("\n") + if ($hash{'display_attrs_3'} == 1); + $r->print("\n") + if ($hash{'display_attrs_4'} == 1); + $r->print("\n") + if ($hash{'display_attrs_5'} == 1); + $r->print("\n") + if ($hash{'display_attrs_6'} == 1); + $r->print("\n") + if ($hash{'display_attrs_8'} == 1); + $r->print("\n") + if ($hash{'display_attrs_10'} == 1); + $r->print("\n") + if ($hash{'display_attrs_11'} == 1); + $r->print("\n") + if ($hash{'display_attrs_7'} == 1); + $r->print(''); + +# ----------------- read in what directories have previously been set to "open" + foreach (keys %hash) { + if ($_ =~ /^diropen_status_/) { + my $key = $_; + $key =~ s/^diropen_status_//; + $dirs{$key} = $hash{$_}; + } + } + + if ($env{'form.openuri'}) { # take care of review and refresh options + my $uri=$env{'form.openuri'}; + if (exists($hash{'diropen_status_'.$uri})) { + my $cursta = $hash{'diropen_status_'.$uri}; + $dirs{$uri} = 'open'; + $hash{'diropen_status_'.$uri} = 'open'; + if ($cursta eq 'open') { + $dirs{$uri} = 'closed'; + $hash{'diropen_status_'.$uri} = 'closed'; + } + } else { + $hash{'diropen_status_'.$uri} = 'open'; + $dirs{$uri} = 'open'; + } + } + + my $toplevel; + my $indent = 0; + $uri = $uri.'/' if $uri !~ /.*\/$/; + + if ($env{'form.dirPointer'} ne 'on') { + $hash{'top.level'} = $uri; + $toplevel = $uri; + } else { + $toplevel = $hash{'top.level'}; + } + +# -------------------------------- if not at top level, provide an uplink arrow + if ($toplevel ne '/res/'){ + my (@uri_com) = split(/\//,$uri); + pop @uri_com; + my $upone = join('/',@uri_com); + my @list = qw (0); + &display_line ($r,'opened',$upone.'&viewOneUp',0,$upone,@list); + $indent = 1; + } + +# -------- recursively go through all the directories and output as appropriate + &scanDir ($r,$toplevel,$indent,\%hash); + + +# -------------------------------------------------------------- end the tables + $r->print('
".&mt('Name')."".&mt('Title')."".&mt("Size")." (".&mt("bytes").") ". + "".&mt("Last accessed")."".&mt("Last modified")."".&mt("Author(s)")."".&mt("Keywords")."".&mt("Language")."".&mt("Usage Statistics")."
(". + &mt("Courses/Network Hits").") ".&mt('updated periodically')."		".&mt("Source Available")."".&mt("Linked/Related Resources")."".&mt("Resource")."
'); +# ---------------------------- embed hidden information useful for group import + $r->print("
"); + $r->print("
"); +# -------------------------------------------------------------- end the tables + $r->print('
'); + +# --------------------------------------------------- end the output and return + $r->print(&Apache::loncommon::end_page()."\n"); + } + if(! $c->aborted()) { +# write back into the temporary file + my %dbfile; + if (tie(%dbfile,'GDBM_File',$diropendb,&GDBM_NEWDB(),0640)) { + while (my($key,$value) = each(%hash)) { + $dbfile{$key}=$value; + } + untie(%dbfile); + } + } return OK; } - -# my @packlist=&Apache::lonnet::dirlist($uri); -# print "Dir list
".join('
',@packlist)."
"; - -sub branch { - my ($r,$uri,$indent,@openuri)=@_; - my ($calluri,$line,@list); - my ($domusr,$foo,$strip,$testdir,$compuri,$chkdir,$diropen); + +# ----------------------------------------------- recursive scan of a directory +sub scanDir { + my ($r,$startdir,$indent,$hashref)=@_; + my $c = $r->connection(); + my ($compuri,$curdir); my $dirptr=16384; + my $obs; $indent++; + my %dupdirs = %dirs; + my @list=&get_list($r,$startdir); + foreach my $line (@list) { + return if ($c->aborted()); + #This is a kludge, sorry aboot this + my ($strip,$dom,undef,$testdir,undef,undef,undef,undef,undef,undef,undef,undef,undef,undef,$obs,undef)=split(/\&/,$line,16); + next if($strip =~ /.*\.meta$/ | $obs eq '1'); + my (@fileparts) = split(/\./,$strip); + if ($hash{'display_attrs_9'} != 1) { +# if not all versions to be shown + if (scalar(@fileparts) >= 3) { + my $fext = pop @fileparts; + my $ov = pop @fileparts; + my $fname = join ('.',@fileparts,$fext); + next if (grep /\Q$fname\E/,@list and $ov =~ /^\d+$/); + } + } - foreach $calluri (@openuri) { - @list=&get_list($r,$uri); - foreach $line (@list) { - chomp $line; - - ($strip,$domusr,$foo,$testdir,$foo)=split(/\&/,$line,5); - $compuri=join("",$strip,"/"); - $chkdir=$testdir&$dirptr; - if ($domusr eq "domain" or $domusr eq "user") { - $chkdir = $dirptr; - $testdir = $dirptr; - } - $diropen = 0; - $diropen = 1 if ($compuri eq $calluri); - &display_line($r,$diropen,$line,$indent); - - my @securi; - push @securi,$calluri; - &branch($r,$compuri,$indent,@securi) if ($calluri =~ $compuri and $calluri=~/^$uri/ and $chkdir == $dirptr and $testdir ne ""); + if ($dom eq 'domain') { + # dom list has full path /res// already + $curdir=''; + $compuri = (split(/\&/,$line))[0]; + } else { + # user, dir & file have name only, i.e., w/o path + $compuri = join('',$startdir,$strip,'/'); + $curdir = $startdir; + } + my $diropen = 'closed'; + if (($dirptr&$testdir) or ($dom =~ /^(domain|user)$/) or ($compuri=~/\.(sequence|page)\/$/)) { + while (my ($key,$val)= each %dupdirs) { + if ($key eq $compuri and $val eq "open") { + $diropen = "opened"; + delete($dupdirs{$key}); + delete($dirs{$key}); + } + } } + &display_line($r,$diropen,$line,$indent,$curdir,$hashref,@list); + &scanDir ($r,$compuri,$indent) if $diropen eq 'opened'; } $indent--; } -# ------ get complete list based on the uri ------ +# --------------- get complete matched list based on the uri (returns an array) sub get_list { my ($r,$uri)=@_; - my @list; - my $luri=$uri; - $luri=~s/\//_/g; - unlink "/home/httpd/perl/tmp/$ENV{'user.name'}_dirlist*.tmp" if ($ENV{'form.dirlistattr'} eq "Refresh"); - my $dirlist = "/home/httpd/perl/tmp/$ENV{'user.name'}_dirlist$luri.tmp"; - if (-e $dirlist) { - my $FH = Apache::File->new($dirlist); - @list=<$FH>; + my @list=(); + (my $luri = $uri) =~ s/\//_/g; + if ($env{'form.updatedisplay'}) { + foreach (keys %hash) { + delete $hash{$_} if ($_ =~ /^dirlist_files_/); + delete $hash{$_} if ($_ =~ /^dirlist_timestamp_files_/); + } + } + + if (defined($hash{'dirlist_files_'.$luri}) && + $hash{'dirlist_timestamp_files_'.$luri}+600 > (time)) { + @list = split(/\n/,$hash{'dirlist_files_'.$luri}); + } elsif ($uri=~/\.(page|sequence)\/$/) { +# is a page or a sequence + $uri=~s/\/$//; + $uri='/'.(split(/\.(page|sequence)\/\//,$uri))[-1]; + $uri=~s/\/+/\//g; + foreach (&Apache::lonsequence::attemptread(&Apache::lonnet::filelocation('',$uri))) { + my @ratpart=split(/\:/,$_); + push(@list,&LONCAPA::map::qtescape($ratpart[1])); + } + $hash{'dirlist_files_'.$luri} = join("\n",@list); } else { - @list=&Apache::lonnet::dirlist($uri); - my $FH = Apache::File->new(">$dirlist"); - print $FH join("\n",@list); +# is really a directory + @list = &Apache::lonnet::dirlist($uri); + $hash{'dirlist_files_'.$luri} = join("\n",@list); + $hash{'dirlist_timestamp_files_'.$luri} = time; } - return @list=&match_ext($r,@list); + return @list=&match_ext($r,@list); } -# ------ get previously opened path, if any ------ -sub get_openpath { +sub dynmetaread { my $uri=shift; - my @list; - my $openlist = "/home/httpd/perl/tmp/$ENV{'user.name'}_dirlist_open_path.tmp"; - if (-e $openlist) { - my $FH = Apache::File->new($openlist); - @list=<$FH>; - close ($FH); - my $line; - my $FH = Apache::File->new(">$openlist"); - print $FH "$uri\n" if $list[0] eq ""; - foreach $line (@list) { - chomp $line; - if ($line eq $uri) { - my @pathcom = split(/\//,$uri); - pop @pathcom; - my $splituri = join ('/',@pathcom); - $uri = join ('',$splituri,"/"); - } else { - print $FH "$line\n"; + if (($hash{'display_attrs_8'}==1) || ($hash{'display_attrs_11'}==1)) { +# We don't want the filename + $uri=~s/\/[^\/]+$//; +# Did we already see this? + my $builddir=$uri; + while ($builddir) { + if ($dynread{$builddir}) { + return 0; } + $builddir=~s/\/[^\/]+$//; } - } else { - my $FH = Apache::File->new(">$openlist"); - print $FH "$uri\n"; +# Actually get the data + %dynhash= + (%dynhash,&Apache::lonmeta::get_dynamic_metadata_from_sql($uri.'/')); +# Remember that we got it + $dynread{$uri}=1; + } +} + +sub initdebug { + my $start_page= + &Apache::loncommon::start_page('Debug',undef, + {'only_body' => 1,}); + $start_page =~ s/\n/ /g; + return < +var debugging = true; +if (debugging) { + var debuggingWindow = window.open('','Debug','width=400,height=300',true); +} + +function output(text) { + if (debugging) { + debuggingWindow.document.writeln(text); } - return $uri; +} +output('$start_page
');   
+
+ENDJS
 }
 
+sub writedebug {
+    my ($text) = @_;
+    return "";
+}
+
+# -------------------- filters out files based on extensions (returns an array)
 sub match_ext {
     my ($r,@packlist)=@_;
-    my $line;
     my @trimlist;
     my $nextline;
     my @fileext;
     my $dirptr=16384;
 
-    my $tabdir  = $r->dir_config('lonTabDir');
-    my $fn = $tabdir."/filetypes.tab";
-    if (-e $fn) {
-	my $FH=Apache::File->new($fn);
-	my @content=<$FH>;
-	foreach $line (@content) {
-	    (my $ext,my $foo) = split /\s+/,$line;
-	    push @fileext,$ext;
-	}
-    }
-    foreach $line (@packlist) {
-	my ($foo,$strip) = split(/\/html/,$line);
-	my @unpacklist = split (/\&/,$strip);
-
-	my @pathfn = split (/\//,$unpacklist[0]);
-	my $fndir = $pathfn[scalar(@pathfn)-1];
-	my @filecom = split (/\./,$fndir);
-	my $curfext = $filecom[scalar(@filecom)-1];
-	my $fnptr = $unpacklist[3]&$dirptr;
- 	if ($fnptr == 0 and $unpacklist[3] ne "") {
-	    foreach $nextline (@fileext) {
-		push @trimlist,$strip if $nextline eq $curfext;
-	    }
+    foreach my $line (@packlist) {
+	chomp $line;
+	$line =~ s/^\/home\/httpd\/html//;
+	my @unpackline = split (/\&/,$line);
+	next if ($unpackline[0] eq '.');
+	next if ($unpackline[0] eq '..');
+	my @filecom = split (/\./,$unpackline[0]);
+	my $fext = pop(@filecom);
+	my $fnptr = ($unpackline[3]&$dirptr) || ($fext=~/\.(page|sequence)$/);
+ 	if ($fnptr == 0 and $unpackline[3] ne "") {
+	    my $embstyle = &Apache::loncommon::fileembstyle($fext);
+            push @trimlist,$line if (defined($embstyle) && 
+				     ($embstyle ne 'hdn' or $fext eq 'meta'));
 	} else {
-	    push @trimlist,$strip;
+	    push @trimlist,$line;
 	}
     }
+    @trimlist = sort {uc($a) cmp uc($b)} (@trimlist);
     return @trimlist;
 }
 
-sub display_line{
-    my ($r,$diropen,$line,$indent)=@_;
-    my (@pathfn, $fndir, $fnptr);
+# ------------------------------- displays one line in appropriate table format
+sub display_line {
+    my ($r,$diropen,$line,$indent,$startdir,$hashref,@list)=@_;
+    my (@pathfn, $fndir);
+# there could be relative paths (files actually belonging into this directory)
+# or absolute paths (for example, from sequences)
+    my $absolute;
+    my $pathprefix;
+    if ($line=~m|^/res/| && $startdir ne '') {
+	$absolute=1;
+	$pathprefix='';
+    } else {
+	$absolute=0;
+	$pathprefix=$startdir;
+    }
     my $dirptr=16384;
     my $fileclr="#ffffe6";
-    my $iconpath="/res/adm/pages/indexericons/";
+    my $iconpath= $r->dir_config('lonIconsURL') . '/';
 
     my @filecom = split (/\&/,$line);
     my @pathcom = split (/\//,$filecom[0]);
     my $listname = $pathcom[scalar(@pathcom)-1];
     my $fnptr = $filecom[3]&$dirptr;
+    my $msg = &mt('View').' '.$filecom[0].' '.&mt('resources');
+    $msg = &mt('Close').' '.$filecom[0].' '.&mt('directory') if $diropen eq 'opened';
 
-    my $tabtag="";
-    my $nextline;
+    my $tabtag='';
     my $i=0;
-
-    while ($i<=5) {
-	my $key="form.attr".$i;
-	$tabtag=join('',$tabtag," ") if $ENV{$key} == 1;
+    while ($i<=11) {
+	$tabtag=join('',$tabtag," ")
+	    if ($i != 9 &&
+		$hash{'display_attrs_'.$i} == 1);
 	$i++;
     }
+    my $valign = ($hash{'display_attrs_7'} == 1 ? 'top' : 'bottom');
 
-    if ($filecom[1] eq "domain") {
-	$r->print("");
-	$r->print("");
-	&begin_form ($r,$filecom[0]);
-	$r->print ("print ("comp.blue.gif\"");
-	$r->print (" name=\"submit\" height=\"22\" type=\"image\" border=\"0\">\n");
-	$r->print("Domain - $listname $tabtag\n");
+# display uplink arrow
+    if ($filecom[1] eq 'viewOneUp') {
+	my $updir=$startdir;
+# -------------- Filter out sequence containment in crumbs and "recent folders"
+	$updir='/'.(split(/\.(page|sequence)\/\//,$startdir))[-1];
+	$updir=~s/\/+/\//g;
+
+	$r->print("$extrafield");
+	$r->print("\n");
+	$r->print ('
'."\n");
+	$r->print(&Apache::loncommon::inhibit_menu_check('input'));
+	$r->print (''."\n");
+	$r->print (''."\n");
+	$r->print ('print (' name="'.$msg.'" type="image" class="LC_indexer_icon" />'.
+		   "\n");
+	$r->print(&mt("Up")."
$tabtag\n");
 	return OK;
     }
+# Do we have permission to look at this?
 
-    if ($filecom[1] eq "user") {
-	$r->print("");
-	$r->print("\n");
+    if($filecom[15] ne '1') { return OK if (!&Apache::lonnet::allowed('bre',$pathprefix.$filecom[0])); }
+
+# make absolute links appear on different background
+    if ($absolute) { $fileclr='#ccdd99'; }
+
+# display domain
+    if ($filecom[1] eq 'domain') {
+ 	$r->print (''."\n")
+ 	    if ($env{'form.dirPointer'} eq "on");
+	$r->print("$extrafield");
+	$r->print("");
 	&begin_form ($r,$filecom[0]);
-	my $count = 0;
-	while ($count <= $indent) {
-	    $r->print("\n");
-	    $count++;
+	my $anchor = $filecom[0];
+	$anchor =~ s/\W//g;
+	$r->print ('');
+	$r->print ('');
+	$r->print ('print (' name="'.$msg.'" type="image" class="LC_indexer_icon" />'.
+		   "\n");
+	my $quotable_filecom = &Apache::loncommon::escape_single($filecom[0]);
+	$r->print ('print (' class="LC_icon" />'."\n");
+	$r->print (&mt("Domain")." - $listname ");
+	if (&Apache::lonnet::domain($listname,'description')) {
+	    $r->print("(".&Apache::lonnet::domain($listname,'description').
+		      ")");
 	}
-	$r->print ("print ("folder_pointer_closed.gif\"") if $diropen == 0;
-	$r->print ("folder_pointer_opened.gif\"") if $diropen == 1;
-	$r->print (" name=\"submit\" height=\"22\" type=\"image\" border=\"0\">\n");
-	$r->print("\n");
-	$r->print("$listname $tabtag\n");
+	$r->print ("$tabtag\n");
+	return OK;
+
+# display user directory
+    }
+    if ($filecom[1] eq 'user') {
+	# $r->print("$extrafield");
+	my $curdir = $startdir.$filecom[0].'/';
+	my $anchor = $curdir;
+	$anchor =~ s/\W//g;
+	$r->print("$extrafield");
+	&begin_form ($r,$curdir);
+	$r->print (''."\n");
+	$r->print ('');
+	$r->print ('print (' name="'.$msg.'" type="image" class="LC_indexer_icon" />'.
+		   "\n");
+	my $quotable_curdir = &Apache::loncommon::escape_single($curdir);
+	$r->print (''.$msg.'');
+	my $domain=(split(m|/|,$startdir))[2];
+	my $plainname=&Apache::loncommon::plainname($listname,$domain);
+	$r->print ($listname);
+	if (defined($plainname) && $plainname) { $r->print(" ($plainname) "); }
+	$r->print (''.$tabtag.''."\n");
 	return OK;
     }
 
 # display file
-    if ($fnptr == 0 and $filecom[3] ne "") {
+    if (($fnptr == 0 and $filecom[3] ne '') or $absolute) {
+        my $title;
+	my $filelink = $pathprefix.$filecom[0];
+	if ($hash{'display_attrs_0'} == 1) {
+	    $title = &Apache::lonnet::gettitle($filelink);
+	}
 	my @file_ext = split (/\./,$listname);
-	my $curfext = $file_ext[scalar(@file_ext)-1];
-	my $count = 0;
-	$r->print("");
-	while ($count <= $indent) {
-	    $r->print("\n");
+	my $curfext = $file_ext[-1];
+        if (@Omit) {
+            foreach (@Omit) { return OK if ($curfext eq $_); }
+        }
+        if (@Only) {
+            my $skip = 1;
+            foreach (@Only) { $skip = 0 if ($curfext eq $_); }
+            return OK if ($skip > 0);
+        }
+	# Set the icon for the file
+	my $iconname = &Apache::loncommon::icon($listname);
+	$r->print("");
+	
+        if ($env{'form.catalogmode'} eq 'interactive') {
+	    my $quotable_filelink = &Apache::loncommon::escape_single($filelink);
+            $r->print("");
+	    $r->print("\"\"".
+		      "\n");
+	    $r->print("");
+	} elsif ($env{'form.catalogmode'} eq 'import') {
+	    $r->print("
\n");
+	    $r->print("print("checked");
+	    }
+	    $r->print(" />\n");
+	    $r->print("
");
+	    $hash{"pre_${fnum}_link"}=$filelink;
+	    $hash{"pre_${fnum}_title"}=$title;
+	    if (!$hash{"pre_${fnum}_title"}) {
+	        $hash{"pre_${fnum}_title"} = 'Not_retrieved';
+	    }
+  	    $fnum++;
+	}
+# Form to open or close sequences
+	if ($filelink=~/\.(page|sequence)$/) {
+	    my $curdir = $startdir.$filecom[0].'/';
+	    &begin_form($r,$curdir);
+	    $indent--;
+	}
+# General indentation
+	if ($indent > 0 and $indent < 11) {
+	    $r->print("\"\"\n");
+	} elsif ($indent >0) {
+	    my $ten = int($indent/10.);
+	    my $rem = $indent%10.0;
+	    my $count = 0;
+	    while ($count < $ten) {
+		$r->print("\"\"\n");
 	    $count++;
+	    }
+	    $r->print("\"\"\n") if $rem > 0;
+	}
+# Sequence open/close icon
+	if ($filelink=~/\.(page|sequence)$/) {
+	    my $curdir = $startdir.$filecom[0].'/';
+	    my $anchor = $curdir;
+	    $anchor =~ s/\W//g;
+	    $r->print ('');
+	    $r->print ('print (' name="'.$msg.'" type="image" class="LC_indexer_icon" />'.
+		       "\n");
+	}
+# Filetype icons
+	$r->print("\"\"\n");
+	my $quotable_filelink = &Apache::loncommon::escape_single($filelink);
+
+	$r->print (" $listname ");
+	$quotable_filelink = &Apache::loncommon::escape_single($filelink.'.meta');
+	&Apache::loncommon::inhibit_menu_check(\$quotable_filelink);
+	$r->print (" (metadata) ");
+# Close form to open/close sequence
+	if ($filelink=~/\.(page|sequence)$/) {
+	    $r->print('');
+	}
+	$r->print("\n");
+	if ($hash{'display_attrs_0'} == 1) {
+	    $r->print(' '.($title eq '' ? ' ' : $title).
+		      ' '."\n");
+	}
+	$r->print(' ',
+		  $filecom[8]," \n") 
+	    if $hash{'display_attrs_1'} == 1;
+	$r->print(' '.
+		  (localtime($filecom[9]))." \n") 
+	    if $hash{'display_attrs_2'} == 1;
+	$r->print(' '.
+		  (localtime($filecom[10]))." \n") 
+	    if $hash{'display_attrs_3'} == 1;
+
+	if ($hash{'display_attrs_4'} == 1) {
+	    my $author = &Apache::lonnet::metadata($filelink,'author');
+	    $r->print(' '.($author eq '' ? ' ' : $author).
+		      " \n");
+	}
+	if ($hash{'display_attrs_5'} == 1) {
+	    my $keywords = &Apache::lonnet::metadata($filelink,'keywords');
+	    # $keywords = ' ' if (!$keywords);
+	    $r->print(' '.($keywords eq '' ? ' ' : $keywords).
+		      " \n");
+	}
+#'
+
+	if ($hash{'display_attrs_6'} == 1) {
+	    my $lang = &Apache::lonnet::metadata($filelink,'language');
+	    $lang = &Apache::loncommon::languagedescription($lang);
+	    $r->print(' '.($lang eq '' ? ' ' : $lang).
+		      " \n");
+	}
+	if ($hash{'display_attrs_8'} == 1) {
+# statistics
+	    &dynmetaread($filelink);
+	    $r->print("");
+	    &dynmetaprint($r,$filelink,'count');
+	    &dynmetaprint($r,$filelink,'course');
+	    &dynmetaprint($r,$filelink,'stdno');
+	    &dynmetaprint($r,$filelink,'avetries');
+	    &dynmetaprint($r,$filelink,'difficulty');
+	    &dynmetaprint($r,$filelink,'disc');
+	    &dynmetaprint($r,$filelink,'clear');
+	    &dynmetaprint($r,$filelink,'technical');
+	    &dynmetaprint($r,$filelink,'correct');
+	    &dynmetaprint($r,$filelink,'helpful');
+	    &dynmetaprint($r,$filelink,'depth');
+	    $r->print(" \n");
+
+	}
+	if ($hash{'display_attrs_10'} == 1) {
+	    my $source = &Apache::lonnet::metadata($filelink,'sourceavail');
+	    if($source eq 'open') {
+		my $sourcelink = &Apache::lonsource::make_link($filelink,$listname);
+		my $quotable_sourcelink = &Apache::loncommon::escape_single($sourcelink);
+		&Apache::loncommon::inhibit_menu_check(\$quotable_sourcelink);
+		$r->print(''."Yes "."\n");
+	    } else { #A cuddled else. :P
+		$r->print(" \n");
+	    }
 	}
-	$r->print("\n");
-	$r->print("\n");
-	$r->print(" ",$listname," \n");
-	$r->print(" ",$filecom[8]," \n") if $ENV{'form.attr0'} == 1;
-	$r->print(" ".(localtime($filecom[9]))." \n") if $ENV{'form.attr1'} == 1;
-	$r->print(" ".(localtime($filecom[10]))." \n") if $ENV{'form.attr2'} == 1;
+	if ($hash{'display_attrs_11'} == 1) {
+# links
+	   &dynmetaread($filelink);
+	   $r->print('');
+	   &coursecontext($r,$filelink);
+	   &dynmetaprint($r,$filelink,'goto_list');
+	   &dynmetaprint($r,$filelink,'comefrom_list');
+	   &dynmetaprint($r,$filelink,'sequsage_list');
+	   &dynmetaprint($r,$filelink,'dependencies');
+           &dynmetaprint($r,$filelink,'course_list');
+	   $r->print('');
+        }
+        if ($hash{'display_attrs_7'} == 1) {
+# Show resource
+	   my $output=&showpreview($filelink);
+           $r->print(' '.($output eq '' ? ' ':$output).
+		      " \n");
+        }
 	$r->print("\n");
     }
 
-# display directory
+# -- display directory
     if ($fnptr == $dirptr) {
-	my @file_ext = split (/\./,$listname);
-	my $curfext = $file_ext[scalar(@file_ext)-1];
-	$r->print("");
-	&begin_form ($r,$filecom[0]);
-
-	my $count = 0;
-	while ($count <= $indent) {
-	    $r->print("\n");
-	    $count++;
+	my $curdir = $startdir.$filecom[0].'/';
+	my $anchor = $curdir;
+	$anchor =~ s/\W//g;
+	$r->print("$extrafield");
+	&begin_form ($r,$curdir);
+	my $indentm1 = $indent-1;
+	if ($indentm1 < 11 and $indentm1 > 0) {
+	    $r->print("\"\"\n");
+	} else {
+	    my $ten = int($indentm1/10.);
+	    my $rem = $indentm1%10.0;
+	    my $count = 0;
+	    while ($count < $ten) {
+		$r->print ("\"\"\n");
+		$count++;
+	    }
+	    $r->print ("\"\"\n") if $rem > 0;
+	}
+	$r->print ('');
+	$r->print ('print (' name="'.$msg.'" type="image" class="LC_indexer_icon" />'.
+		   "\n");
+	my $quotable_curdir = &Apache::loncommon::escape_single($curdir);
+	$r->print (''
+		   .''.&mt('Open Folder').''.
+		   "\n");
+	$r->print ("$listname\n");
+# Attributes
+	my $filelink = $startdir.$filecom[0].'/default';
+
+	if ($hash{'display_attrs_0'} == 1) {
+	    my $title = &Apache::lonnet::gettitle($filelink);
+	    $r->print(' '.($title eq '' ? ' ' : $title).
+		      ' '."\n");
 	}
+	$r->print(' ',
+		  $filecom[8]," \n") 
+	    if $hash{'display_attrs_1'} == 1;
+	$r->print(' '.
+		  (localtime($filecom[9]))." \n") 
+	    if $hash{'display_attrs_2'} == 1;
+	$r->print(' '.
+		  (localtime($filecom[10]))." \n") 
+	    if $hash{'display_attrs_3'} == 1;
+
+	if ($hash{'display_attrs_4'} == 1) {
+	    my $author = &Apache::lonnet::metadata($filelink,'author');
+	    $r->print(' '.($author eq '' ? ' ' : $author).
+		      " \n");
+	}
+	if ($hash{'display_attrs_5'} == 1) {
+	    my $keywords = &Apache::lonnet::metadata($filelink,'keywords');
+	    # $keywords = ' ' if (!$keywords);
+	    $r->print(' '.($keywords eq '' ? ' ' : $keywords).
+		      " \n");
+	}
+	if ($hash{'display_attrs_6'} == 1) {
+	    my $lang = &Apache::lonnet::metadata($filelink,'language');
+	    $lang = &Apache::loncommon::languagedescription($lang);
+	    $r->print(' '.($lang eq '' ? ' ' : $lang).
+		      " \n");
+	}
+	if ($hash{'display_attrs_8'} == 1) {
+	   $r->print(' ');
+	}
+ 	if ($hash{'display_attrs_10'} == 1) {
+	   $r->print(' ');
+	}
+	if ($hash{'display_attrs_11'} == 1) {
+	   $r->print(' ');
+	}
+	if ($hash{'display_attrs_7'} == 1) {
+	   $r->print(' ');
+        }
+	$r->print('');
+    }
 
-	$r->print ("print ("folder_pointer_closed.gif\"") if $diropen == 0;
-	$r->print ("folder_pointer_opened.gif\"") if $diropen == 1;
-	$r->print (" name=\"submit\" height=\"22\" type=\"image\" border=\"0\">\n");
-	$r->print("\n") if $diropen == 0;
-	$r->print("\n") if $diropen == 1;
-	$r->print("$listname $tabtag\n");
+}
+
+sub coursecontext {
+    my ($r,$filelink)=@_;
+    my $filesymb=&Apache::lonnet::symbread($filelink);
+    if ($filesymb) {
+	my ($map,$index,$resource)=&Apache::lonnet::decode_symb($filesymb);
+	$r->print(&mt('Already in this course:
[_1] in folder/map [_2].
',
+	      &Apache::lonnet::gettitle($resource),
+	      &Apache::lonnet::gettitle($map)));
+    }
+}
+
+sub showpreview {
+    my ($filelink)=@_;
+    if ($filelink=~m-^(/ext/|http://)-) {
+	return &mt('External Resource, preview not enabled');
+    }
+    my ($curfext)=($filelink=~/\.(\w+)$/);
+    my $output='';
+    my $embstyle=&Apache::loncommon::fileembstyle($curfext);
+    if ($embstyle eq 'ssi') {
+       my $cache=$Apache::lonnet::perlvar{'lonDocRoot'}.$filelink.
+                    '.tmp';
+       if ((!$env{'form.updatedisplay'}) &&
+                    (-e $cache)) {
+          open(FH,$cache);
+          $output=join("\n",);
+          close(FH);
+       } else {
+# In update display mode, remove old cache. This is done to retroactively
+# clean up course context renderings.
+	  if (-e $cache) {
+	       unlink($cache);
+	  }
+          $output=&Apache::lonnet::ssi_body($filelink);
+# Is access denied? Don't render, don't store
+          if ($output=~/LONCAPAACCESSCONTROLERRORSCREEN/s) {
+             $output='';
+# Was this rendered in course content? Don't store
+          } elsif (!&Apache::lonnet::symbread($filelink)) {
+             open(FH,">$cache");
+             print FH $output;
+             close(FH);
+          }
+       }
+       $output=''.$output.'';
+    } elsif ($embstyle eq 'img') {
+       $output=''.&mt('Preview').'';
+    } elsif ($filelink=~m{^/res/($match_domain)/($match_username)/}) {
+       $output=''.&mt('Preview').'';
     }
+    return $output;
 }
 
+sub dynmetaprint {
+    my ($r,$filelink,$item)=@_;
+    if ($dynhash{$filelink}->{$item}) {
+	$r->print("\n
".$fieldnames{$item}.': '.
+		  &Apache::lonmeta::prettyprint($item,
+						$dynhash{$filelink}->{$item},
+		  (($env{'form.catalogmode'} ne 'import')?'preview':''),
+		  '',
+		  (($env{'form.catalogmode'} eq 'import')?'document.forms.fileattr':''),1));
+    }
+}
+
+# ------------------- prints the beginning of a form for directory or file link
 sub begin_form {
     my ($r,$uri) = @_;
-    my $currenturi = $r->uri;
-    my $openuri = $ENV{'form.openuri'};
-    if ($ENV{'form.openuri'} =~ /$currenturi(.*)\&/) {
-	$openuri =~ s/$currenturi(.*)\&//g;
-    } else {
-	$currenturi = join ('',$currenturi,"&");
-	$openuri = join ('&',$ENV{'form.openuri'},$currenturi);
-	$openuri =~ s/\&+/\&/g;
-    }
-    $r->print ("
\n");
-    $r->print ("\n");
-
-    for (my $i=0; $i<=5; $i++) {
-	$r->print ("\n") if $ENV{'form.attr'.$i} == 1;
-    }
+    my $anchor = $uri;
+    $anchor =~ s/\W//g;
+    $uri=&Apache::loncommon::escape_single($uri);
+    $r->print (''."\n");
+    $r->print (''.
+	       "\n");
+    $r->print (''."\n");
+    $r->print(&Apache::loncommon::inhibit_menu_check('input'));
+    $dnum++;
 }
 
-sub display_env {
-    my $r=shift;
-    my %otherenv;
-    $otherenv{'hi'}='there';
-    $otherenv{'does_this'}='work?';
-    &Apache::lonnet::appenv(%otherenv);
-    my $envkey;
-    foreach $envkey (sort keys %ENV) {
-	$r->print("$envkey: $ENV{$envkey}
\n");
+# --------- settings whenever the user causes the indexer window to be launched
+sub start_fresh_session {
+    my ($hash) = @_;
+    delete $hash->{'form.catalogmode'};
+    delete $hash->{'form.mode'};
+    delete $hash->{'form.form'};
+    delete $hash->{'form.element'};
+    delete $hash->{'form.omit'};
+    delete $hash->{'form.only'};
+    foreach (keys %{$hash}) {
+        delete $hash->{$_} if (/^(pre_|store)/);
     }
-#    $r->print("
".&Apache::lonnet::ssi('/res/msu/korte/test.tex')); 
-#    $r->print("
".join('
',&Apache::lonnet::dirlist('/res/msu/korte/')));
+}
+
+# ------------------------------------------------------------------- setvalues
+sub setvalues {
+    # setvalues is used in registerurl to synchronize the database
+    # hash and environment hashes
+    my ($H1,$h1key,$H2,$h2key) =@_;
+    #
+    if (exists $H2->{$h2key}) {
+	$H1->{$h1key} = $H2->{$h2key};
+    } elsif (exists $H1->{$h1key}) {
+	$H2->{$h2key} = $H1->{$h1key};
+    } 
 }
 
 1;
-__END__
+
+sub cleanup {
+    if (tied(%hash)){
+	&Apache::lonnet::logthis('Cleanup indexer: hash');
+    }
+    return OK;
+}
+
+
+
+
+
+=head1 NAME
+
+Apache::lonindexer - mod_perl module for cross server filesystem browsing
+
+=head1 SYNOPSIS
+
+Invoked by /etc/httpd/conf/srm.conf:
+
+ 
+ SetHandler perl-script
+ PerlHandler Apache::lonindexer
+ 
+
+=head1 INTRODUCTION
+
+This module enables a scheme of browsing across a cross server.
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+=head1 BEGIN SUBROUTINE
+
+This routine is only run once after compilation.
+
+=over 4
+
+=item *
+
+Initializes %language hash table.
+
+=back
+
+=head1 HANDLER SUBROUTINE
+
+This routine is called by Apache and mod_perl.
+
+=over 4
+
+=item *
+
+read in machine configuration variables
+
+=item *
+
+see if called from an interactive mode
+
+=item *
+
+refresh environment with user database values (in %hash)
+
+=item *
+
+define extra fields and buttons in case of special mode
+
+=item *
+
+set catalogmodefunctions to have extra needed javascript functionality
+
+=item *
+
+print header
+
+=item *
+
+evaluate actions from previous page (both cumulatively and chronologically)
+
+=item *
+
+output title
+
+=item *
+
+get state of file attributes to be showing
+
+=item *
+
+output state of file attributes to be showing
+
+=item *
+
+output starting row to the indexed file/directory hierarchy
+
+=item *
+
+read in what directories have previously been set to "open"
+
+=item *
+
+if not at top level, provide an uplink arrow
+
+=item *
+
+recursively go through all the directories and output as appropriate
+
+=item *
+
+information useful for group import
+
+=item *
+
+end the tables
+
+=item *
+
+end the output and return
+
+=back
+
+=head1 OTHER SUBROUTINES
+
+=over 4
+
+=item *
+
+scanDir - recursive scan of a directory
+
+=item *
+
+get_list - get complete matched list based on the uri (returns an array)
+
+=item *
+
+match_ext - filters out files based on extensions (returns an array)
+
+=item *
+
+display_line - displays one line in appropriate table format
+
+=item *
+
+begin_form - prints the beginning of a form for directory or file link
+
+=item *
+
+start_fresh_session - settings whenever the user causes the indexer window
+to be launched
+
+=back
+
+=cut