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Diff for /loncom/interface/lonsearchcat.pm between versions 1.99 and 1.223

version 1.99, 2001/08/26 21:49:49 version 1.223, 2004/05/05 17:29:06
Line 1 Line 1
 # The LearningOnline Network with CAPA  # The LearningOnline Network with CAPA
 #  
 # Search Catalog  # Search Catalog
 #  #
 # YEAR=2001  # $Id$
 # 03/08/2001 Scott Harrison  
 # Scott Harrison: 03/12/2001, 03/13/2001, 03/14/2001, 03/15/2001, 03/19/2001  
 # Scott Harrison: 03/20/2001, 03/21/2001, 03/22/2001, 03/26/2001, 03/27/2001  
 # Scott Harrison: 04/02/2001, 08/15/2001, 08/24/2001, 08/25/2001  
   
 ###############################################################################  
 ##                                                                           ##  
 ## 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                                                      ##  
 ##                                                                           ##  
 ###############################################################################  
   
 # ---------------------------------------------------- Description of functions  
 #  
 #  
 # === WEB HANDLER FUNCTIONS  
 # BEGIN() : run once after compilation to initialize values  
 # handler(server reference) : interacts with the Apache server layer  
 #                             (for /adm/searchcat URLs)  
 # get_unprocessed_cgi() : reads in critical name/value pairs that may have not  
 #                         been processed and passed into %ENV by the web server  
 # make_persistent() : makes a set of hidden HTML fields to make  
 #                     SQL search interface information to be persistent  
 #  
 #  
 # === WEB INTERFACE COMPONENT FUNCTIONS  
 # simpletextfield(name,value) : returns HTML formatted string for simple text  
 #                               field  
 # simplecheckbox(name,value) : returns HTML formatted string for simple  
 #                              checkbox  
 # searchphrasefield(title,name,value) : returns HTML formatted string for  
 #                                       a search expression phrase field  
 # dateboxes(name, defaultmonth, defaultday, defaultyear) : returns HTML  
 #                                                          formatted string  
 #                                                          for a calendar date  
 # selectbox(title,name,value,%HASH=options) : returns HTML formatted string for  
 #                                             a selection box field  
 #  
 #  
 # === SEARCH FUNCTIONS  
 # advancedsearch(server reference, environment reference) : perform a complex  
 #                                  multi-field logical query  
 # basicsearch(server reference, environment reference) : perform a simple  
 #                               single-field logical query  
 # build_SQL_query(field name, logic) : builds a SQL query string from a  
 #                                      logical expression with AND/OR keywords  
 # build_custommetadata_query(field_name, logic_statement) : builds a perl  
 #                 regular expression from a logical expression with AND/OR  
 #                 keywords  
 # recursive_SQL_query_build(field name, reverse notation expression) :   
 #                 builds a SQL query string from a reverse notation expression  
 #                 logical expression with AND/OR keywords  
 # build_date_queries(cmonth1, cday1, cyear1, cmonth2, cday2, cyear2,  
 #                    lmonth1, lday1, lyear1, lmonth2, lday2, lyear2) :  
 #                 Builds a SQL logic query to check time/date entries.  
 #  #
   # Copyright Michigan State University Board of Trustees
 #  #
 # === OUTPUTTING RESULTS FUNCTION  # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
 # output_results(output mode,  
 #                server reference,   
 #                environment reference,  
 #                reply list reference) : outputs results from search  
 #  #
   # 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.
 #  #
 # === DIFFERENT WAYS TO VIEW METADATA RECORDS  # LON-CAPA is distributed in the hope that it will be useful,
 # detailed_citation_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) :  # but WITHOUT ANY WARRANTY; without even the implied warranty of
 #          see metadata viewing notes below   # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # summary_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) :  # GNU General Public License for more details.
 #          see metadata viewing notes below   
 # fielded_format_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) :  
 #          see metadata viewing notes below   
 # xml_sgml_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) :  
 #          see metadata viewing notes below   
 #  ___________________________________________________________________________  
 # | * Metadata viewing notes                                                  |  
 # | Output is a HTML-ified string.                                            |  
 # | Input arguments are title, author, subject, url, keywords, version, notes,|  
 # | short abstract, mime, language, creation date, last revision date, owner, |  
 # | copyright, hostname, httphost, and extra custom metadata to show.         |  
 #  ---------------------------------------------------------------------------  
 #  #
   # 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
 #  #
 # === TEST CONDITIONAL FUNCTIONS  # /home/httpd/html/adm/gpl.txt
 # filled(field) : determines whether a given field has been filled  
 #  #
   # http://www.lon-capa.org/
 #  #
 # === ERROR FUNCTIONS  ###############################################################################
 # output_blank_field_error(server reference) : outputs a message saying that  ###############################################################################
 #                                              more fields need to be filled in  
 # output_date_error(server reference, error message) : outputs  =pod 
 #         an error message specific to bad date format.  
   =head1 NAME
   
   lonsearchcat - LONCAPA Search Interface
   
   =head1 SYNOPSIS
   
   Search interface to LON-CAPAs digital library
   
   =head1 DESCRIPTION
   
   This module enables searching for a distributed browseable catalog.
   
   This is part of the LearningOnline Network with CAPA project
   described at http://www.lon-capa.org.
   
   lonsearchcat presents the user with an interface to search the LON-CAPA
   digital library.  lonsearchcat also initiates the execution of a search
   by sending the search parameters to LON-CAPA servers.  The progress of 
   search (on a server basis) is displayed to the user in a separate window.
   
   =head1 Internals
   
   =over 4
   
   =cut
   
   ###############################################################################
   ###############################################################################
   
 package Apache::lonsearchcat;  package Apache::lonsearchcat;
   
 # ------------------------------------------------- modules used by this module  
 use strict;  use strict;
 use Apache::Constants qw(:common);  use Apache::Constants qw(:common :http);
 use Apache::lonnet();  use Apache::lonnet();
 use Apache::File();  use Apache::File();
 use CGI qw(:standard);  use CGI qw(:standard);
 use Text::Query;  use Text::Query;
   use GDBM_File;
   use Apache::loncommon();
   use Apache::lonmysql();
   use Apache::lonmeta;
   use Apache::lonhtmlcommon;
   use Apache::lonlocal;
   use LONCAPA::lonmetadata();
   use HTML::Entities();
   
   ######################################################################
   ######################################################################
   ##
   ## Global variables
   ##
   ######################################################################
   ######################################################################
   my %groupsearch_db;  # Database hash used to save values for the 
                        # groupsearch RAT interface.
   my %persistent_db;   # gdbm hash which holds data which is supposed to
                        # persist across calls to lonsearchcat.pm
   
   # The different view modes and associated functions
   
   my %Views = ("detailed" => \&detailed_citation_view,
        "summary"  => \&summary_view,
        "fielded"  => \&fielded_format_view,
        "xml"      => \&xml_sgml_view,
        "compact"  => \&compact_view);
   
 # ---------------------------------------- variables used throughout the module  ######################################################################
   ######################################################################
 # -- information holders  
 my %language; # holds contents of language.tab  
 my %cprtag; # holds contents of copyright.tab  
 my %mimetag; # holds contents of filetypes.tab  
 my %hostdomains; # matches host name to host domain  
 my %hostips; # matches host name to host ip  
 my %hitcount; # stores number of hits per host  
   
 # -- dynamically rendered interface components  
 my $closebutton; # button that closes the search window  
 my $importbutton; # button to take the selected results and go to group sorting  
   
 # -- miscellaneous variables  
 my $scrout; # string that holds portions of the screen output  
 my $fnum; # search result counter  
 my $yourself; # allows for quickly limiting to oneself  
   
 # ------------------------------------------ choices for different output views  
 # Detailed Citation View ---> sub detailed_citation_view  
 # Summary View ---> sub summary_view  
 # Fielded Format ---> sub fielded_format_view  
 # XML/SGML ---> sub xml_sgml_view  
 my $basicviewselect=<<END;  
 <select name='basicviewselect'>  
 <option value='Detailed Citation View'>Detailed Citation View</option>  
 <option value='Summary View'>Summary View</option>  
 <option value='Fielded Format'>Fielded Format</option>  
 <option value='XML/SGML'>XML/SGML</option>  
 </select>  
 END  
 my $advancedviewselect=<<END;  
 <select name='advancedviewselect'>  
 <option value='Detailed Citation View'>Detailed Citation View</option>  
 <option value='Summary View'>Summary View</option>  
 <option value='Fielded Format'>Fielded Format</option>  
 <option value='XML/SGML'>XML/SGML</option>  
 </select>  
 END  
   
 # ----------------------------------------------------------------------- BEGIN  
 sub BEGIN {  
 # --------------------------------- Compute various listings of metadata values  
     $language{'any'}='Any language';  
     {  
  my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.  
  '/language.tab');  
  map {  
     $_=~/(\w+)\s+([\w\s\-]+)/; chomp;  
     $language{$1}=$2;  
  } <$fh>;  
     }  
     $cprtag{'any'}='Any copyright/distribution';  
     {  
  my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonIncludes'}.  
  '/copyright.tab');  
  map {  
     $_=~/(\w+)\s+([\w\s\-]+)/; chomp;  
     $cprtag{$1}=$2;  
  } <$fh>;  
     }  
     $mimetag{'any'}='Any type';  
     {  
  my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.  
  '/filetypes.tab');  
  map {  
     $_=~/(\w+)\s+(\w+)\s+([\w\s\-]+)/; chomp;  
     $mimetag{$1}=".$1 $3";  
  } <$fh>;  
     }  
     {  
  my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.  
  '/hosts.tab');  
  map {  
     $_=~/(\w+?)\:(\w+?)\:(\w+?)\:(.*)/; chomp;  
     if ($3 eq 'library') {  
  $hostdomains{$1}=$2;  
  $hostips{$1}=$4;  
     }  
  } <$fh>;  
     }  
 }  
   
 # ----------------------------- Handling routine called via Apache and mod_perl  
 sub handler {  sub handler {
     my $r = shift;      my $r = shift;
   #    &set_defaults();
     &get_unprocessed_cgi();      #
       # set form defaults
     $r->content_type('text/html');      #
       my $hidden_fields;# Hold all the hidden fields used to keep track
                         # of the search system state
       my $importbutton; # button to take the selected results and go to group 
                         # sorting
       my $diropendb;    # The full path to the (temporary) search database file.
                         # This is set and used in &handler() and is also used in 
                         # &output_results().
       my $bodytag;  # LON-CAPA standard body tag, gotten from 
                     # &Apache::lonnet::bodytag. 
                     # No title, no table, just a <body> tag.
   
       my $loaderror=&Apache::lonnet::overloaderror($r);
       if ($loaderror) { return $loaderror; }
       #
       my $closebutton;  # button that closes the search window 
                         # This button is different for the RAT compared to
                         # normal invocation.
       #
       &Apache::loncommon::content_type($r,'text/html');
     $r->send_http_header;      $r->send_http_header;
     return OK if $r->header_only;      return OK if $r->header_only;
       ##
 # ----------------------------------- configure dynamic components of interface      ## Prevent caching of the search interface window.  Hopefully this means
     my $hidden='';      ## we will get the launch=1 passed in a little more.
     if ($ENV{'form.catalogmode'} eq 'interactive') {      &Apache::loncommon::no_cache($r);
  $hidden="<input type='hidden' name='catalogmode' value='interactive'>".      ## 
     "\n";      ## Pick up form fields passed in the links.
         $closebutton="<input type='button' name='close' value='CLOSE' ".      ##
     "onClick='self.close()'>"."\n";      &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
     }               ['catalogmode','launch','acts','mode','form','element','pause',
     elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {                'phase','persistent_db_id','table','start','show',
  $hidden=<<END;                'cleargroupsort','titleelement']);
 <input type='hidden' name='catalogmode' value='groupsearch'>      ##
 END      ## The following is a trick - we wait a few seconds if asked to so
         $closebutton=<<END;      ##     the daemon running the search can get ahead of the daemon
 <input type='button' name='close' value='CLOSE' onClick='self.close()'>      ##     printing the results.  We only need (theoretically) to do
       ##     this once, so the pause indicator is deleted
       ##
       if (exists($ENV{'form.pause'})) {
           sleep(1);
           delete($ENV{'form.pause'});
       }
       ##
       ## Initialize global variables
       ##
       my $domain  = $r->dir_config('lonDefDomain');
       $diropendb= "/home/httpd/perl/tmp/".
           "$ENV{'user.domain'}_$ENV{'user.name'}_searchcat.db";
       #
       # set the name of the persistent database
       #          $ENV{'form.persistent_db_id'} can only have digits in it.
       if (! exists($ENV{'form.persistent_db_id'}) ||
           ($ENV{'form.persistent_db_id'} =~ /\D/) ||
           ($ENV{'form.launch'} eq '1')) {
           $ENV{'form.persistent_db_id'} = time;
       }
       $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
       my $persistent_db_file = "/home/httpd/perl/tmp/".
           &Apache::lonnet::escape($domain).
               '_'.&Apache::lonnet::escape($ENV{'user.name'}).
                   '_'.$ENV{'form.persistent_db_id'}.'_persistent_search.db';
       ##
       &Apache::lonhtmlcommon::clear_breadcrumbs();
       if (exists($ENV{'request.course.id'}) && $ENV{'request.course.id'} ne '') {
           &Apache::lonhtmlcommon::add_breadcrumb
                ({href=>'/adm/searchcat?'.
                      'catalogmode='.$ENV{'form.catalogmode'}.
                      '&launch='.$ENV{'form.launch'}.
                      '&mode='.$ENV{'form.mode'},
                 text=>"Course and Catalog Search",
                 bug=>'Searching',});
       } else {
           &Apache::lonhtmlcommon::add_breadcrumb
                ({href=>'/adm/searchcat?'.
                      'catalogmode='.$ENV{'form.catalogmode'}.
                      '&launch='.$ENV{'form.launch'}.
                      '&mode='.$ENV{'form.mode'},
                 text=>"Catalog Search",
                 bug=>'Searching',});
       }
       #
       if ($ENV{'form.phase'} !~ m/(basic|adv|course)_search/) {
           if (! &get_persistent_form_data($persistent_db_file)) {
               if ($ENV{'form.phase'} =~ /(run_search|results)/) {
                   &Apache::lonnet::logthis('lonsearchcat:'.
                                            'Unable to recover data from '.
                                            $persistent_db_file);
                   $r->print(<<END);
   <html>
   <head><title>LON-CAPA Search Error</title></head>
   $bodytag
   We were unable to retrieve data describing your search.  This is a serious
   error and has been logged.  Please alert your LON-CAPA administrator.
   </body>
   </html>
 END  END
                   return OK;
               }
           }
       } else {
           &clean_up_environment();
       }
       ##
       ## Clear out old values from groupsearch database
       ##
       untie %groupsearch_db if (tied(%groupsearch_db));
       if (($ENV{'form.cleargroupsort'} eq '1') || 
           (($ENV{'form.launch'} eq '1') && 
            ($ENV{'form.catalogmode'} eq 'groupsearch'))) {
    if (tie(%groupsearch_db,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
       &start_fresh_session();
       untie %groupsearch_db;
               delete($ENV{'form.cleargroupsort'});
    } else {
               # This is a stupid error to give to the user.  
               # It really tells them nothing.
       $r->print('<html><head></head>'.$bodytag.
                         'Unable to tie hash to db file</body></html>');
       return OK;
    }
       }
       ##
       ## Configure hidden fields
       ##
       $hidden_fields = '<input type="hidden" name="persistent_db_id" value="'.
           $ENV{'form.persistent_db_id'}.'" />'."\n";
       if (exists($ENV{'form.catalogmode'})) {
           $hidden_fields .= &hidden_field('catalogmode');
       }
       if (exists($ENV{'form.form'})) {
           $hidden_fields .= &hidden_field('form');
       }
       if (exists($ENV{'form.element'})) {
           $hidden_fields .= &hidden_field('element');
       }
       if (exists($ENV{'form.titleelement'})) {
           $hidden_fields .= &hidden_field('titleelement');
       }
       if (exists($ENV{'form.mode'})) {
           $hidden_fields .= &hidden_field('mode');
       }
       ##
       ## Configure dynamic components of interface
       ##
       if ($ENV{'form.catalogmode'} eq 'interactive') {
           $closebutton="<input type='button' name='close' value='CLOSE' ";
           if ($ENV{'form.phase'} =~ /(results|run_search)/) {
       $closebutton .="onClick='parent.close()'";
           } else {
               $closebutton .="onClick='self.close()'";
           }
           $closebutton .=">\n";
       } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {
           $closebutton="<input type='button' name='close' value='CLOSE' ";
           if ($ENV{'form.phase'} =~ /(results|run_search)/) {
       $closebutton .="onClick='parent.close()'";
           } else {
               $closebutton .="onClick='self.close()'";
           }
           $closebutton .= ">";
         $importbutton=<<END;          $importbutton=<<END;
 <input type='button' name='import' value='IMPORT'  <input type='button' name='import' value='IMPORT'
 onClick='javascript:select_group()'>  onClick='javascript:select_group()'>
 END  END
       } else {
           $closebutton = '';
           $importbutton = '';
       }
       ##
       ## Sanity checks on form elements
       ##
       if (!defined($ENV{'form.viewselect'})) {
           if (($ENV{'form.catalogmode'} eq 'groupsearch') ||
               ($ENV{'form.catalogmode'} eq 'interactive')) {
               $ENV{'form.viewselect'} ="Compact View";
           } else {
               $ENV{'form.viewselect'} ="Detailed Citation View";
           }
     }      }
       $ENV{'form.phase'} = 'disp_basic' if (! exists($ENV{'form.phase'}));
       $ENV{'form.show'} = 20 if (! exists($ENV{'form.show'}));
       #
       $ENV{'form.searchmode'} = 'basic' if (! exists($ENV{'form.searchmode'}));
       if ($ENV{'form.phase'} eq 'adv_search' ||
           $ENV{'form.phase'} eq 'disp_adv') {
           $ENV{'form.searchmode'} = 'advanced';
       } elsif ($ENV{'form.phase'} eq 'course_search') {
           $ENV{'form.searchmode'} = 'course_search';
       }
       #
       if ($ENV{'form.searchmode'} eq 'advanced') {
           &Apache::lonhtmlcommon::add_breadcrumb
               ({href=>'/adm/searchcat?phase=disp_adv&'.
                     'catalogmode='.$ENV{'form.catalogmode'}.
                     '&launch='.$ENV{'form.launch'}.
                     '&mode='.$ENV{'form.mode'},
                     text=>"Advanced Search",
                     bug=>'Searching',});
       } elsif ($ENV{'form.searchmode'} eq 'course search') {
           &Apache::lonhtmlcommon::add_breadcrumb
               ({href=>'/adm/searchcat?phase=disp_adv&'.
                     'catalogmode='.$ENV{'form.catalogmode'}.
                     '&launch='.$ENV{'form.launch'}.
                     '&mode='.$ENV{'form.mode'},
                     text=>"Course Search",
                     bug=>'Searching',});
       }
       ##
       ## Switch on the phase
       ##
       if ($ENV{'form.phase'} eq 'disp_basic') {
           &print_basic_search_form($r,$closebutton,$hidden_fields);
       } elsif ($ENV{'form.phase'} eq 'disp_adv') {
           &print_advanced_search_form($r,$closebutton,$hidden_fields);
       } elsif ($ENV{'form.phase'} eq 'results') {
           &display_results($r,$importbutton,$closebutton,$diropendb);
       } elsif ($ENV{'form.phase'} =~ /^(sort|run_search)$/) {
           my ($query,$customquery,$customshow,$libraries,$pretty_string) =
               &get_persistent_data($persistent_db_file,
                    ['query','customquery','customshow',
                     'libraries','pretty_string']);
           if ($ENV{'form.phase'} eq 'sort') {
               &print_sort_form($r,$pretty_string);
           } elsif ($ENV{'form.phase'} eq 'run_search') {
               &run_search($r,$query,$customquery,$customshow,
                           $libraries,$pretty_string);
           }
       } elsif ($ENV{'form.phase'} eq 'course_search') {
           &course_search($r);
       } elsif(($ENV{'form.phase'} eq 'basic_search') ||
               ($ENV{'form.phase'} eq 'adv_search')) {
           # Set up table
           if (! defined(&create_results_table())) {
       my $errorstring=&Apache::lonmysql::get_error();
               &Apache::lonnet::logthis('lonsearchcat.pm: Unable to create '.
                                        'needed table.  lonmysql error:'.
                                        $errorstring);
               $r->print(<<END);
   <html><head><title>Search Error</title></head>
   $bodytag
   Unable to create table in which to store search results.  
   The search has been aborted.
   </body>
   </html>
   END
               return OK;
           }
           delete($ENV{'form.launch'});
           if (! &make_form_data_persistent($r,$persistent_db_file)) {
               $r->print(<<END);
   <html><head><title>Search Error</title></head>
   $bodytag
   Unable to properly store search information.  The search has been aborted.
   </body>
   </html>
   END
               return OK;
           }
           #
           # We are running a search
           my ($query,$customquery,$customshow,$libraries) = 
               (undef,undef,undef,undef);
           my $pretty_string;
           if ($ENV{'form.phase'} eq 'basic_search') {
               ($query,$pretty_string,$libraries) = 
                   &parse_basic_search($r,$closebutton,$hidden_fields);
           } else {                      # Advanced search
               ($query,$customquery,$customshow,$libraries,$pretty_string) 
                   = &parse_advanced_search($r,$closebutton,$hidden_fields);
               return OK if (! defined($query));
           }
           &make_persistent({ query => $query,
                              customquery => $customquery,
                              customshow => $customshow,
                              libraries => $libraries,
                              pretty_string => $pretty_string },
                            $persistent_db_file);
           ##
           ## Print out the frames interface
           ##
           &print_frames_interface($r);
       }
       return OK;
   } 
   
 # ------------------------------------------------------ Determine current user  #
     $yourself=$ENV{'user.name'}.'@'.$ENV{'user.domain'};  # The mechanism used to store values away and retrieve them does not
   # handle the case of missing environment variables being significant.
 # --- Now, depending on the interface actions, do one of three things here:  #
 # --- 1. a basic search  # This routine sets non existant checkbox form elements to ''.
 # --- 2. an advanced search  #
 # --- 3. output a search interface  sub clean_up_environment {
       if ($ENV{'form.phase'} eq 'basic_search') {
           if (! exists($ENV{'form.related'})) {
               $ENV{'form.related'} = '';
           }
           if (! exists($ENV{'form.domains'})) {
               $ENV{'form.domains'} = '';
           }
       } elsif ($ENV{'form.phase'} eq 'adv_search') {
           foreach my $field ('title','keywords','notes',
                              'abstract','standards','mime') {
               if (! exists($ENV{'form.'.$field.'_related'})) {
                   $ENV{'form.'.$field.'_related'} = '';
               }
           }
       } elsif ($ENV{'form.phase'} eq 'course_search') {
           if (! exists($ENV{'form.crsrelated'})) {
               $ENV{'form.crsrelated'} = '';
           }
       }
   }
   
 # ----------------------------------- See if a search invocation should be done  sub hidden_field {
     if ($ENV{'form.basicsubmit'} eq 'SEARCH') {      my ($name,$value) = @_;
  return &basicsearch($r,\%ENV);      if (! defined($value)) {
           $value = $ENV{'form.'.$name};
       }
       return '<input type="hidden" name="'.$name.'" value="'.$value.'" />'.$/;
   }
   
   ######################################################################
   ######################################################################
   ##
   ##   Course Search
   ##
   ######################################################################
   ######################################################################
   {   # Scope the course search to avoid global variables
   #
   # Variables For course search
   my %alreadyseen;
   my %hash;
   my $totalfound;
   
   sub course_search {
       my $r=shift;
       my $bodytag=&Apache::loncommon::bodytag('Course Search');
       my $pretty_search_string = '<b>'.$ENV{'form.courseexp'}.'</b>';
       my $search_string = $ENV{'form.courseexp'};
       my @New_Words;
       if ($ENV{'form.crsrelated'}) {
           ($search_string,@New_Words) = &related_version($ENV{'form.courseexp'});
           if (@New_Words) {
               $pretty_search_string .= ' '.&mt("with related words").": <b>@New_Words</b>.";
           } else {
               $pretty_search_string .= ' '.&mt('with no related words').".";
           }
     }      }
     elsif ($ENV{'form.advancedsubmit'} eq 'SEARCH') {      my $fulltext=$ENV{'form.crsfulltext'};
  return &advancedsearch($r,\%ENV);      my @allwords=($search_string,@New_Words);
       $totalfound=0;
       $r->print('<html><head><title>LON-CAPA Course Search</title></head>'.
         $bodytag.'<hr /><center><font size="+2" face="arial">'.$pretty_search_string.'</font></center><hr />');
       $r->rflush();
   # ======================================================= Go through the course
       undef %alreadyseen;
       %alreadyseen=();
       my $c=$r->connection;
       if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.".db",
               &GDBM_READER(),0640)) {
           foreach (keys %hash) {
               if ($c->aborted()) { last; }
               if (($_=~/^src\_(.+)$/) && (!$alreadyseen{$hash{$_}})) {
                   &checkonthis($r,$hash{$_},0,$hash{'title_'.$1},$fulltext,
                                @allwords);
               }
           }
           untie(%hash);
     }      }
       unless ($totalfound) {
    $r->print('<p>'.&mt('No resources found').'.</p>');
       }
   # =================================================== Done going through course
       $r->print('</body></html>');
   }
   
 # ----------------------------- Else, begin building search interface to output  # =============================== This pulls up a resource and its dependencies
     $scrout=''; # building a part of screen output  
     $scrout.=&searchphrasefield('Limit by title','title',  
  $ENV{'form.title'});  
   
     $scrout.=&searchphrasefield('Limit by author','author',  
  $ENV{'form.author'});  
   
     $scrout.=&searchphrasefield('Limit by subject','subject',  
  $ENV{'form.subject'});  
   
     $scrout.=&searchphrasefield('Limit by keywords','keywords',  
  $ENV{'form.keywords'});  
   
     $scrout.=&searchphrasefield('Limit by URL','url',  
  $ENV{'form.url'});  
   
 #    $scrout.=&searchphrasefield('Limit by version','version',  
 # $ENV{'form.version'});  
   
     $scrout.=&searchphrasefield('Limit by notes','notes',  
  $ENV{'form.notes'});  
   
     $scrout.=&searchphrasefield('Limit by abstract','abstract',  
  $ENV{'form.abstract'});  
   
     $ENV{'form.mime'}='notxxx' unless length($ENV{'form.mime'});  
     $scrout.=&selectbox('Limit by MIME type','mime',  
  $ENV{'form.mime'},%mimetag);  
   
     $ENV{'form.language'}='any' unless length($ENV{'form.language'});  
   
     $scrout.=&selectbox('Limit by language','language',  sub checkonthis {
  $ENV{'form.language'},%language);      my ($r,$url,$level,$title,$fulltext,@allwords)=@_;
           $alreadyseen{$url}=1;
       $r->rflush();
 # ------------------------------------------------ Compute date selection boxes      my $result=&Apache::lonnet::metadata($url,'title').' '.
     $scrout.=<<CREATIONDATESTART;                 &Apache::lonnet::metadata($url,'subject').' '.
 <p>                 &Apache::lonnet::metadata($url,'abstract').' '.
 <font color="#800000" face="helvetica"><b>LIMIT BY CREATION DATE RANGE:</b>                 &Apache::lonnet::metadata($url,'keywords');
 </font>      if (($url) && ($fulltext)) {
 <br />   $result.=&Apache::lonnet::ssi_body($url);
 between:      }
 CREATIONDATESTART      $result=~s/\s+/ /gs;
     $scrout.=&dateboxes('creationdatestart',1,1,1976,      my $applies=0;
  $ENV{'form.creationdatestart_month'},      foreach (@allwords) {
  $ENV{'form.creationdatestart_day'},          if ($_=~/\w/) {
  $ENV{'form.creationdatestart_year'},     if ($result=~/$_/si) {
  );        $applies++;
     $scrout.=<<CREATIONDATEEND;             }
 and:         }
 CREATIONDATEEND      }
     $scrout.=&dateboxes('creationdateend',12,31,2051,  # Does this resource apply?
  $ENV{'form.creationdateend_month'},      if ($applies) {
  $ENV{'form.creationdateend_day'},         $r->print('<br />');
  $ENV{'form.creationdateend_year'},         for (my $i=0;$i<=$level*5;$i++) {
  );             $r->print('&nbsp;');
     $scrout.="</p>";         }
          $r->print('<a href="'.$url.'" target="cat">'.
     $scrout.=<<LASTREVISIONDATESTART;   ($title?$title:$url).'</a><br />');
 <p>         $totalfound++;
 <font color="#800000" face="helvetica"><b>LIMIT BY LAST REVISION DATE RANGE:      } elsif ($fulltext) {
 </b></font>         $r->print(' .');
 <br />between:      }
 LASTREVISIONDATESTART      $r->rflush();
     $scrout.=&dateboxes('lastrevisiondatestart',1,1,1976,  # Check also the dependencies of this one
  $ENV{'form.lastrevisiondatestart_month'},      my $dependencies=
  $ENV{'form.lastrevisiondatestart_day'},                  &Apache::lonnet::metadata($url,'dependencies');
  $ENV{'form.lastrevisiondatestart_year'},      foreach (split(/\,/,$dependencies)) {
  );         if (($_=~/^\/res\//) && (!$alreadyseen{$_})) {
     $scrout.=<<LASTREVISIONDATEEND;            &checkonthis($r,$_,$level+1,'',$fulltext,@allwords);
 and:         }
 LASTREVISIONDATEEND      }
     $scrout.=&dateboxes('lastrevisiondateend',12,31,2051,  }
  $ENV{'form.lastrevisiondateend_month'},  
  $ENV{'form.lastrevisiondateend_day'},  
  $ENV{'form.lastrevisiondateend_year'},  
  );  
     $scrout.='</p>';  
   
     $scrout.=&searchphrasefield('Limit by publisher/owner','owner',  
  $ENV{'form.owner'});  
   
     $ENV{'form.copyright'}='any' unless length($ENV{'form.copyright'});  
     $scrout.=&selectbox('Limit by copyright/distribution','copyright',  
  $ENV{'form.copyright'},%cprtag);  
   
 # ------------------------------------------- Compute customized metadata field  sub untiehash {
     $scrout.=<<CUSTOMMETADATA;      if (tied(%hash)) {
 <p>          untie(%hash);
 <font color="#800000" face="helvetica"><b>LIMIT BY SPECIAL METADATA FIELDS:</b>      }
 </font>  }
 For resource-specific metadata, enter in an expression in the form of   
 <i>key</i>=<i>value</i> separated by operators such as AND or OR.<br />  
 <b>Example:</b> grandmother=75 OR grandfather=85  
 <br />  
 CUSTOMMETADATA  
 $scrout.=&simpletextfield('custommetadata',$ENV{'form.custommetadata'});  
 $scrout.=' <i>initial users of this system do not need to worry about this option</i>';  
   
     $scrout.=<<CUSTOMSHOW;  } # End of course search scoping
 <p>  
 <font color="#800000" face="helvetica"><b>SHOW SPECIAL METADATA FIELDS:</b>  
 </font>  
 Enter in a space-separated list of special metadata fields to show  
 in a fielded listing for each record result.  
 <br />  
 CUSTOMSHOW  
 $scrout.=&simpletextfield('customshow',$ENV{'form.customshow'});  
 $scrout.=' <i>initial users of this system do not need to worry about this option</i>';  
   
 # ---------------------------------------------------------------- Print screen  sub search_html_header {
     $r->print(<<ENDDOCUMENT);      my $Str = <<ENDHEADER;
 <html>  <html>
 <head>  <head>
 <title>The LearningOnline Network with CAPA</title>  <title>The LearningOnline Network with CAPA</title>
 </head>  </head>
 <body bgcolor="#FFFFFF">  ENDHEADER
 <img align='right' src='/adm/lonIcons/lonlogos.gif' />      return $Str;
 <h1>Search Catalog</h1>  }
 <form method="post" action="/adm/searchcat">  
 $hidden  ######################################################################
   ######################################################################
   
   =pod 
   
   =item &print_basic_search_form() 
   
   Prints the form for the basic search.  Sorry the name is so cryptic.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub print_basic_search_form {
       my ($r,$closebutton,$hidden_fields) = @_;
       my $bodytag=&Apache::loncommon::bodytag('Search').
           &Apache::lonhtmlcommon::breadcrumbs(undef,'Searching','Searching',
                                               undef,undef,! $ENV{'form.launch'});
       my $scrout = &search_html_header().$bodytag;
       if (&Apache::lonnet::allowed('bre',$ENV{'request.role.domain'})) {
           # Define interface components
           my $userelatedwords=
               &mt('[_1] use related words',
                   &Apache::lonhtmlcommon::checkbox
                   ('related',$ENV{'form.related'},'related'));
           my $onlysearchdomain=
               &mt('[_1] only search domain [_2]',
                   &Apache::lonhtmlcommon::checkbox('domains',
                                                    $ENV{'form.domains'},
                                                    $r->dir_config('lonDefDomain')
                                                    ),
                   $r->dir_config('lonDefDomain')
                   );
           my $adv_search_link = 
               '<a href="/adm/searchcat?'.
               'phase=disp_adv&'.
               'catalogmode='.$ENV{'form.catalogmode'}.
               '&launch='.$ENV{'form.launch'}.
               '&mode='.$ENV{'form.mode'}.
               '">'.&mt('Advanced Search').'</a>';
           #
           $scrout.='<form name="loncapa_search" method="post" '.
               'action="/adm/searchcat">'.
               '<input type="hidden" name="phase" value="basic_search" />'.
               $hidden_fields;
           #
           $scrout .= '<center>'.$/;
           if ($ENV{'request.course.id'}) {
               $scrout .= '<h1>'.&mt('LON-CAPA Catalog Search').'</h1>';
           } else {
               # No need to tell them they are searching
               $scrout.= ('<br />'x2);
           }
           $scrout.='<table>'.
               '<tr><td align="center" valign="top">'.
               &Apache::lonhtmlcommon::textbox('basicexp',
                                               $ENV{'form.basicexp'},50).'<br />'.
               '<font size="-1">'.&searchhelp().'</font>'.'</td>'.
               '<td><font size="-1">'.
               '<nobr>'.('&nbsp;'x3).$adv_search_link.'</nobr>'.'<br />'.
               '<nobr>'.('&nbsp;'x1).$userelatedwords.'</nobr>'.'<br />'.
               '<nobr>'.('&nbsp;'x1).$onlysearchdomain.'</nobr>'.'<br />'.
               '</font></td>'.
               '</tr>'.$/;
           #
   #        $scrout .= '<tr><td align="center">'.
   #            '<font size="-1">'.
   #            $userelatedwords.('&nbsp;'x3).
   #            $onlysearchdomain.('&nbsp;'x2).$adv_search_link.
   #            '</font>'.
   #            '</td></tr>'.$/;
           $scrout .= '<tr><td align="center" colspan="2">'.
               '<font size="-1">'.
               '<input type="submit" name="basicsubmit" '.
               'value="'.&mt('Search').'" />'.
               ('&nbsp;'x2).$closebutton.('&nbsp;'x2).
               &viewoptions().
               '</font>'.
               '</td></tr>'.$/;
           $scrout .= '</table>'.$/.'</center>'.'</form>';
       }
       if ($ENV{'request.course.id'}) {
    my %lt=&Apache::lonlocal::texthash('srch' => 'Search',
                                              'header' => 'Course Search',
    'note' => 'Enter terms or phrases, then press "Search" below',
    'use' => 'use related words',
    'full' =>'fulltext search (time consuming)'
      );
           $scrout.=(<<ENDCOURSESEARCH);
   <form name="loncapa_search" method="post" action="/adm/searchcat">
   <center>
 <hr />  <hr />
 <h3>Basic Search</h3>  <h1>$lt{'header'}</h1>    
   <input type="hidden" name="phase" value="course_search" />
   $hidden_fields
 <p>  <p>
 Enter terms or phrases separated by search operators  $lt{'note'}.
 such as AND or OR then press SEARCH below.  Terms should be specific  
 to the title, author, subject, notes, or abstract information associated  
 with a resource.  
 <br />  
 ENDDOCUMENT  
     $r->print(&simpletextfield('basicexp',$ENV{'form.basicexp'}));  
     $r->print(' ');  
     $r->print(&simplecheckbox('titleonly',$ENV{'form.titleonly'}));  
     $r->print('<font color="#800000">Title only</font> ');  
 #    $r->print(&simplecheckbox('allversions',$ENV{'form.allversions'}));  
 # <font color="#800000">Search historic archives</font>  
     $r->print(<<ENDDOCUMENT);  
 <br />  
 <input type="submit" name="basicsubmit" value='SEARCH' />  
 <input type="reset" name="reset" value='RESET' />  
 $closebutton  
 $basicviewselect  
 </p>  </p>
 <hr />  
 <h3>Advanced Search</h3>  
 $scrout  
 <p>  <p>
 <input type="submit" name="advancedsubmit" value='SEARCH' />  <table>
 <input type="reset" name="reset" value='RESET' />  <tr><td>
 $closebutton  ENDCOURSESEARCH
 $advancedviewselect          $scrout.='&nbsp;'.
               &Apache::lonhtmlcommon::textbox('courseexp',
                                     $ENV{'form.courseexp'},40);
           my $crscheckbox = 
               &Apache::lonhtmlcommon::checkbox('crsfulltext',
                                      $ENV{'form.crsfulltext'});
           my $relcheckbox = 
               &Apache::lonhtmlcommon::checkbox('crsrelated',
      $ENV{'form.crsrelated'});
           $scrout.=(<<ENDENDCOURSE);
   </td></tr>
   <tr><td>$relcheckbox $lt{'use'}</td><td></td></tr>
   <tr><td>$crscheckbox $lt{'full'}</td><td></td></tr>
   </table><p>
   &nbsp;<input type="submit" name="coursesubmit" value='$lt{'srch'}' />
 </p>  </p>
   </center>
 </form>  </form>
   ENDENDCOURSE
       }
       $scrout.=(<<ENDDOCUMENT);
 </body>  </body>
 </html>  </html>
 ENDDOCUMENT  ENDDOCUMENT
     return OK;      $r->print($scrout);
 }       return;
   
 # ----------- grab unprocessed CGI variables that may have been appended to URL  
 sub get_unprocessed_cgi {  
     map {  
        my ($name, $value) = split(/=/,$_);  
        $value =~ tr/+/ /;  
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;  
        if ($name eq 'catalogmode') {  
    $ENV{'form.'.$name}=$value;  
        }  
     } (split(/&/,$ENV{'QUERY_STRING'}));  
 }  }
   ######################################################################
   ######################################################################
   
 # ------------------------------------------------------------- make persistent  =pod 
 sub make_persistent {  
     my $persistent='';  =item &advanced_search_form() 
       
     map {  Prints the advanced search form.
  if (/^form\./ && !/submit/) {  
     my $name=$_;  =cut
     my $key=$name;  
     $ENV{$key}=~s/\'//g; # do not mess with html field syntax  ######################################################################
     $name=~s/^form\.//;  ######################################################################
     $persistent.=<<END;  sub print_advanced_search_form{
 <input type='hidden' name='$name' value='$ENV{$key}' />      my ($r,$closebutton,$hidden_fields) = @_;
       my $bodytag=&Apache::loncommon::bodytag('Advanced Catalog Search').
           &Apache::lonhtmlcommon::breadcrumbs(undef,'Searching',
                                               'Searching',
                                               undef,undef,
                                               ! $ENV{'form.launch'});
   
       my %lt=&Apache::lonlocal::texthash('srch' => 'Search',
          'reset' => 'Reset',
          'help' => 'Help');
       my $advanced_buttons=<<"END";
   <input type="submit" name="advancedsubmit" value='$lt{"srch"}' />
   <input type="reset" name="reset" value='$lt{"reset"}' />
   $closebutton
 END  END
       my $scrout=&search_html_header();
       $scrout .= <<"ENDHEADER";
   $bodytag
   <form method="post" action="/adm/searchcat" name="advsearch">
   <p>
   $advanced_buttons
   ENDHEADER
       $scrout.=('&nbsp;'x2).&viewoptions().'</p>'.$hidden_fields. 
           '<input type="hidden" name="phase" value="adv_search" />';
       my %fields=&Apache::lonmeta::fieldnames();
       #
       $scrout .= '<h3>'.&mt('Standard Metadata').'</h3>';
       $scrout .= "<table>\n";
       $scrout .= '<tr><td>&nbsp;</td><td colspan="2"><font size="-1">'.
           ('&nbsp;'x2).&searchhelp()."</font></td></tr>\n";
       my %related_word_search = 
           ('title'    => 1,
            'author'   => 0,
            'owner'    => 0,
            'authorspace'  => 0,
            'modifyinguser'=> 0,
            'keywords' => 1,
            'notes'    => 1,
            'abstract' => 1,
            'standards'=> 1,
            'mime'     => 1,
            );
       #
       foreach my $field ('title','author','owner','authorspace','modifyinguser',
        'keywords','notes','abstract','standards','mime') {
    $scrout.='<tr><td align="right">'.&titlefield($fields{$field}).'</td><td>'.
       &Apache::lonmeta::prettyinput($field,
                                             $ENV{'form.'.$field},
                                             $field,
                                             'advsearch',
     $related_word_search{$field},
                                             '</td><td align="left">',
                                             $ENV{'form.'.$field.'_related'},
                                             50);
           if ($related_word_search{$field}) {
               $scrout .= 'related words';
           } else {
               $scrout .= '</td><td>&nbsp;';
         }          }
     } (keys %ENV);          $scrout .= '</td></tr>'.$/;
     return $persistent;      }
       foreach my $field ('lowestgradelevel','highestgradelevel') {
    $scrout.='<tr>'.
               '<td align="right">'.&titlefield($fields{$field}).'</td>'.
               '<td colspan="2">'.
       &Apache::lonmeta::prettyinput($field,
                                             $ENV{'form.'.$field},
                                             $field,
                                             'advsearch',
     0).
                                             '</td></tr>'.$/;
       }
       $scrout.='<tr><td align="right">'.
    &titlefield(&mt('MIME Type Category')).'</td><td colspan="2">'. 
       &Apache::loncommon::filecategoryselect('category',
      $ENV{'form.category'}).
       '</td></tr>'.$/;
       $scrout.='<tr><td align="right" valign="top">'.
    &titlefield(&mt('Domains')).'</td><td colspan="2">'. 
       &Apache::loncommon::domain_select('domains',
      $ENV{'form.domains'},1).
       '</td></tr>'.$/;
       #
       # Misc metadata
       $scrout.='<tr><td align="right" valign="top">'.
    &titlefield(&mt('Copyright/Distribution')).'</td><td colspan="2">'.
           &Apache::lonmeta::selectbox('copyright',
                                       '',,
                                       \&Apache::loncommon::copyrightdescription,
                                       ( undef,
                                         &Apache::loncommon::copyrightids)
                                       ).'</td></tr>'.$/;
       $scrout.='<tr><td align="right" valign="top">'.
    &titlefield(&mt('Language')).'</td><td colspan="2">'.
           &Apache::lonmeta::selectbox('language',
                                       'notset',,
                                       \&Apache::loncommon::languagedescription,
                                       ('any',&Apache::loncommon::languageids)
                                       ).'</td></tr>';
       $scrout .= "</table>\n";    
       #
       # Dynamic metadata
       $scrout .= '<h3>'.&mt('Problem Statistics').'</h3>';
       $scrout .= "<table>\n";
       $scrout .= '<tr><td>&nbsp;</td><td align="center">'.&mt('Minimum').'</td>'.
           '<td align="center">'.&mt('Maximum').'</td></tr>'."\n";
       foreach my $statistic 
           ({ name=>'count',
              description=>'Network-wide number of accesses (hits)',},
            { name=>'stdno',
              description=>
                  'Total number of students who have worked on this problem',},
            { name => 'avetries',
              description=>'Average number of tries till solved',},
            { name => 'difficulty',
              description=>'Degree of difficulty',},
            { name => 'disc',
              description=>'Degree of discrimination'}) {
           $scrout .= '<tr><td align="right">'.
               &titlefield(&mt($statistic->{'description'})).
               '</td><td align="center">'.
               '<input type="text" name="'.$statistic->{'name'}.'_min" '.
               'value="" size="6" />'.
               '</td><td align="center">'.
               '<input type="text" name="'.$statistic->{'name'}.'_max" '.
               'value="" size="6" />'.
               '</td></tr>'.$/;
       }
       $scrout .= "</table>\n";
       $scrout .= '<h3>'.&mt('Evaluation Data').'</h3>';
       $scrout .= "<table>\n";
       $scrout .= '<tr><td>&nbsp;</td><td align="center">'.&mt('Minimum').'</td>'.
           '<td align="center">'.&mt('Maximum').'</td></tr>'."\n";
       foreach my $evaluation
           ( { name => 'clear',
               description => 'Material presented in clear way'},
             { name =>'depth',
               description => 'Material covered with sufficient depth'},
             { name => 'helpful',
               description => 'Material is helpful'},
             { name => 'correct',
               description => 'Material appears to be correct'},
             { name => 'technical',
               description => 'Resource is technically correct'}){
           $scrout .= '<tr><td align="right">'.
               &titlefield(&mt($evaluation->{'description'})).
               '</td><td align="center">'.
               '<input type="text" name="'.$evaluation->{'name'}.'_min" '.
               'value="" size="6" />'.
               '</td><td align="center">'.
               '<input type="text" name="'.$evaluation->{'name'}.'_max" '.
               'value="" size="6" />'.
               '</td></tr>'.$/;
       }
       $scrout .= "</table>\n";
       #
       # Creation/Modification date limits
       $scrout .= '<h3>'.&mt('Creation and Modification dates').'</h3>';
       $scrout .= "\n<table>\n";
       my $cafter = 
           &Apache::lonhtmlcommon::date_setter('advsearch',         # formname
                                               'creationdate1', # fieldname
                                               0,           # current value
                                               '',          # special 
                                               1,           # includeempty
                                               '',          # state
                                               1,           # no_hh_mm_ss
                                               );
       my $cbefore = 
           &Apache::lonhtmlcommon::date_setter('advsearch',         # formname
                                               'creationdate2', # fieldname
                                               0,           # current value
                                               '',          # special 
                                               1,           # includeempty
                                               '',          # state
                                               1,           # no_hh_mm_ss
                                               );
       $scrout .= &mt('<tr><td align="right">Created between</td>'.
                      '<td>[_1]</td></tr>'.
                      '<tr><td align="right">and </td>'.
                      '<td>[_2]</td></tr>',$cafter,$cbefore);
       my $lafter = 
           &Apache::lonhtmlcommon::date_setter('advsearch',
                                               'revisiondate1', 
                                               0,           # current value
                                               '',          # special 
                                               1,           # includeempty
                                               '',          # state
                                               1,           # no_hh_mm_ss
                                               );
       my $lbefore = 
           &Apache::lonhtmlcommon::date_setter('advsearch',
                                               'revisiondate2',
                                               0,           # current value
                                               '',          # special 
                                               1,           # includeempty
                                               '',          # state
                                               1,           # no_hh_mm_ss
                                               );
       $scrout .= &mt('<tr><td align="right">Last modified between </td>'.
                      '<td>[_1]</td></tr>'.
                      '<tr><td align="right">and</td>'.
                      '<td>[_2]</td></tr>',$lafter,$lbefore);
       $scrout.="</table>\n";
       $scrout.=<<ENDDOCUMENT;
   $advanced_buttons
   </form>
   </body>
   </html>
   ENDDOCUMENT
       $r->print($scrout);
       return;
   }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &titlefield()
   
   Inputs: title text
   
   Outputs: titletext with font wrapper
   
   =cut
   
   ######################################################################
   ######################################################################
   sub titlefield {
       my $title=shift;
       return $title;
 }  }
   
 # --------------------------------------------------------- Various form fields  ######################################################################
   ######################################################################
   
   =pod 
   
   =item viewoptiontext()
   
 sub simpletextfield {  Inputs: codename for view option
     my ($name,$value)=@_;  
     return '<input type=text name=\''.$name.  Outputs: displayed text
    '\' size=20 value=\''.$value.'\' />';  
   =cut
   
   ######################################################################
   ######################################################################
   sub viewoptiontext {
       my $code=shift;
       my %desc=&Apache::lonlocal::texthash
           ('detailed' => "Detailed Citation View",
            'xml' => 'XML/SGML',
            'compact' => 'Compact View',
            'fielded' => 'Fielded Format',
            'summary' => 'Summary View');
       return $desc{$code};
 }  }
   
 sub simplecheckbox {  ######################################################################
     my ($name,$value)=@_;  ######################################################################
     my $checked='';  
     $checked="CHECKED" if $value eq 'on';  =pod 
     return '<input type=checkbox name=\''.$name.'\' '. $checked . '>';  
   =item viewoptions()
   
   Inputs: none
   
   Outputs: text for box with view options
   
   =cut
   
   ######################################################################
   ######################################################################
   sub viewoptions {
       my $scrout;
       if (! defined($ENV{'form.viewselect'})) { 
           $ENV{'form.viewselect'}='detailed'; 
       }
       $scrout.=&Apache::lonmeta::selectbox('viewselect',
    $ENV{'form.viewselect'},
    \&viewoptiontext,
    sort(keys(%Views)));
       $scrout.= '&nbsp;&nbsp;';
       my $countselect = &Apache::lonmeta::selectbox('show',
                                                     $ENV{'form.show'},
                                                     undef,
                                                     (10,20,50,100,1000,10000));
       $scrout .= ('&nbsp;'x2).&mt('[_1] Records per Page',$countselect).
           '</nobr>'.$/;
       return $scrout;
 }  }
   
 sub searchphrasefield {  ######################################################################
     my ($title,$name,$value)=@_;  ######################################################################
     my $instruction=<<END;  
 Enter terms or phrases separated by search operators such  =pod 
 as AND or OR.  
 END  =item searchhelp()
     my $uctitle=uc($title);  
     return "\n<p><font color=\"#800000\" face=\"helvetica\"><b>$uctitle:</b>".  Inputs: none
    "</FONT> $instruction<br />".  
            '<input type=text name="'.$name.'" size=80 value=\''.$value.'\'>';  Outputs: return little blurb on how to enter searches
 }  
   =cut
 sub dateboxes {  
     my ($name,$defaultmonth,$defaultday,$defaultyear,  ######################################################################
  $currentmonth,$currentday,$currentyear)=@_;  ######################################################################
     ($defaultmonth,$defaultday,$defaultyear)=('','','');  sub searchhelp {
     my $month=<<END;      return &mt('Enter terms or phrases separated by AND, OR, or NOT');
 <select name="${name}_month">  }
 <option value='$defaultmonth'> </option>  
 <option value="1">January</option>  ######################################################################
 <option value="2">February</option>  ######################################################################
 <option value="3">March</option>  
 <option value="4">April</option>  =pod 
 <option value="5">May</option>  
 <option value="6">June</option>  =item &get_persistent_form_data()
 <option value="7">July</option>  
 <option value="8">August</option>  Inputs: filename of database
 <option value="9">September</option>  
 <option value="10">October</option>  Outputs: returns undef on database errors.
 <option value="11">November</option>  
 <option value="12">December</option>  This function is the reverse of &make_persistent() for form data.
 </select>  Retrieve persistent data from %persistent_db.  Retrieved items will have their
 END  values unescaped.  If a form value already exists in $ENV, it will not be
     $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth);  overwritten.  Form values that are array references may have values appended
     my $day=<<END;  to them.
 <select name="${name}_day">  
 <option value='$defaultday'> </option>  =cut
 <option value="1">1</option>  
 <option value="2">2</option>  ######################################################################
 <option value="3">3</option>  ######################################################################
 <option value="4">4</option>  sub get_persistent_form_data {
 <option value="5">5</option>      my $filename = shift;
 <option value="6">6</option>      return 0 if (! -e $filename);
 <option value="7">7</option>      return undef if (! tie(%persistent_db,'GDBM_File',$filename,
 <option value="8">8</option>                             &GDBM_READER(),0640));
 <option value="9">9</option>      #
 <option value="10">10</option>      # These make sure we do not get array references printed out as 'values'.
 <option value="11">11</option>      my %arrays_allowed = ('form.domains'=>1);
 <option value="12">12</option>      #
 <option value="13">13</option>      # Loop through the keys, looking for 'form.'
 <option value="14">14</option>      foreach my $name (keys(%persistent_db)) {
 <option value="15">15</option>          next if ($name !~ /^form./);
 <option value="16">16</option>          # Kludgification begins!
 <option value="17">17</option>          if ($name eq 'form.domains' && 
 <option value="18">18</option>              $ENV{'form.searchmode'} eq 'basic' &&
 <option value="19">19</option>              $ENV{'form.phase'} ne 'disp_basic') {
 <option value="20">20</option>              next;
 <option value="21">21</option>          }
 <option value="22">22</option>          # End kludge (hopefully)
 <option value="23">23</option>          next if (exists($ENV{$name}));
 <option value="24">24</option>          my @values = map { 
 <option value="25">25</option>              &Apache::lonnet::unescape($_);
 <option value="26">26</option>          } split(',',$persistent_db{$name});
 <option value="27">27</option>          next if (@values <1);
 <option value="28">28</option>          if ($arrays_allowed{$name}) {
 <option value="29">29</option>              $ENV{$name} = [@values];
 <option value="30">30</option>          } else {
 <option value="31">31</option>              $ENV{$name} = $values[0] if ($values[0]);
 </select>          }
 END      }
     $day=~s/(\"$currentday\")/$1 SELECTED/ if length($currentday);      untie (%persistent_db);
     my $year=<<END;      return 1;
 <select name="${name}_year">  }
 <option value='$defaultyear'> </option>  
 <option value="1976">1976</option>  ######################################################################
 <option value="1977">1977</option>  ######################################################################
 <option value="1978">1978</option>  
 <option value="1979">1979</option>  =pod 
 <option value="1980">1980</option>  
 <option value="1981">1981</option>  =item &get_persistent_data()
 <option value="1982">1982</option>  
 <option value="1983">1983</option>  Inputs: filename of database, ref to array of values to recover.
 <option value="1984">1984</option>  
 <option value="1985">1985</option>  Outputs: array of values.  Returns undef on error.
 <option value="1986">1986</option>  
 <option value="1987">1987</option>  This function is the reverse of &make_persistent();
 <option value="1988">1988</option>  Retrieve persistent data from %persistent_db.  Retrieved items will have their
 <option value="1989">1989</option>  values unescaped.  If the item contains commas (before unescaping), the
 <option value="1990">1990</option>  returned value will be an array pointer. 
 <option value="1991">1991</option>  
 <option value="1992">1992</option>  =cut
 <option value="1993">1993</option>  
 <option value="1994">1994</option>  ######################################################################
 <option value="1995">1995</option>  ######################################################################
 <option value="1996">1996</option>  sub get_persistent_data {
 <option value="1997">1997</option>      my $filename = shift;
 <option value="1998">1998</option>      my @Vars = @{shift()};
 <option value="1999">1999</option>      my @Values;   # Return array
 <option value="2000">2000</option>      return undef if (! -e $filename);
 <option value="2001">2001</option>      return undef if (! tie(%persistent_db,'GDBM_File',$filename,
 <option value="2002">2002</option>                             &GDBM_READER(),0640));
 <option value="2003">2003</option>      foreach my $name (@Vars) {
 <option value="2004">2004</option>          if (! exists($persistent_db{$name})) {
 <option value="2005">2005</option>              push @Values, undef;
 <option value="2006">2006</option>              next;
 <option value="2007">2007</option>          }
 <option value="2008">2008</option>          my @values = map { 
 <option value="2009">2009</option>              &Apache::lonnet::unescape($_);
 <option value="2010">2010</option>          } split(',',$persistent_db{$name});
 <option value="2011">2011</option>          if (@values <= 1) {
 <option value="2012">2012</option>              push @Values,$values[0];
 <option value="2013">2013</option>          } else {
 <option value="2014">2014</option>              push @Values,\@values;
 <option value="2015">2015</option>          }
 <option value="2016">2016</option>      }
 <option value="2017">2017</option>      untie (%persistent_db);
 <option value="2018">2018</option>      return @Values;
 <option value="2019">2019</option>  }
 <option value="2020">2020</option>  
 <option value="2021">2021</option>  ######################################################################
 <option value="2022">2022</option>  ######################################################################
 <option value="2023">2023</option>  
 <option value="2024">2024</option>  =pod 
 <option value="2025">2025</option>  
 <option value="2026">2026</option>  =item &make_persistent() 
 <option value="2027">2027</option>  
 <option value="2028">2028</option>  Inputs: Hash of values to save, filename of persistent database.
 <option value="2029">2029</option>  
 <option value="2030">2030</option>  Store variables away to the %persistent_db.
 <option value="2031">2031</option>  Values will be escaped.  Values that are array pointers will have their
 <option value="2032">2032</option>  elements escaped and concatenated in a comma separated string.  
 <option value="2033">2033</option>  
 <option value="2034">2034</option>  =cut
 <option value="2035">2035</option>  
 <option value="2036">2036</option>  ######################################################################
 <option value="2037">2037</option>  ######################################################################
 <option value="2038">2038</option>  sub make_persistent {
 <option value="2039">2039</option>      my %save = %{shift()};
 <option value="2040">2040</option>      my $filename = shift;
 <option value="2041">2041</option>      return undef if (! tie(%persistent_db,'GDBM_File',
 <option value="2042">2042</option>                             $filename,&GDBM_WRCREAT(),0640));
 <option value="2043">2043</option>      foreach my $name (keys(%save)) {
 <option value="2044">2044</option>          my @values = (ref($save{$name}) ? @{$save{$name}} : ($save{$name}));
 <option value="2045">2045</option>          # We handle array references, but not recursively.
 <option value="2046">2046</option>          my $store = join(',', map { &Apache::lonnet::escape($_); } @values );
 <option value="2047">2047</option>          $persistent_db{$name} = $store;
 <option value="2048">2048</option>      }
 <option value="2049">2049</option>      untie(%persistent_db);
 <option value="2050">2050</option>      return 1;
 <option value="2051">2051</option>  }
 </select>  
 END  ######################################################################
     $year=~s/(\"$currentyear\")/$1 SELECTED/ if length($currentyear);  ######################################################################
     return "$month$day$year";  
   =pod 
   
   =item &make_form_data_persistent() 
   
   Inputs: filename of persistent database.
   
   Store most form variables away to the %persistent_db.
   Values will be escaped.  Values that are array pointers will have their
   elements escaped and concatenated in a comma separated string.  
   
   =cut
   
   ######################################################################
   ######################################################################
   sub make_form_data_persistent {
       my $r = shift;
       my $filename = shift;
       my %save;
       foreach (keys(%ENV)) {
           next if (!/^form/ || /submit/);
           $save{$_} = $ENV{$_};
       }
       return &make_persistent(\%save,$filename);
 }  }
   
 sub selectbox {  ######################################################################
     my ($title,$name,$value,%options)=@_;  ######################################################################
     my $uctitle=uc($title);  
     my $selout="\n<p><font color=\"#800000\" face=\"helvetica\"><b>$uctitle:".  =pod 
  "</b></font><br />".'<select name="'.$name.'">';  
     map {  =item &parse_advanced_search()
         $selout.='<option value=\''.$_.'\'';  
         if ($_ eq $value) { $selout.=' selected'; }  Parse advanced search form and return the following:
         $selout.='>'.$options{$_}.'</option>';  
     } sort keys %options;  
     return $selout.'</select>';  
 }  
   
 # ----------------------------------------------- Performing an advanced search  
 sub advancedsearch {  
     my ($r,$envhash)=@_;  
     my %ENV=%{$envhash};  
   
   =over 4
   
   =item $query Scalar containing an SQL query.
   
   =item $customquery Scalar containing a custom query.
   
   =item $customshow Scalar containing commands to show custom metadata.
   
   =item $libraries_to_query Reference to array of domains to search.
   
   =back
   
   =cut
   
   ######################################################################
   ######################################################################
   sub parse_advanced_search {
       my ($r,$closebutton,$hidden_fields)=@_;
       my @BasicFields = ('title','author','subject','keywords','url','version',
                          'notes','abstract','extension','owner',
   #                       'custommetadata','customshow',
                          'modifyinguser','standards','mime');
       my @StatsFields = &statfields();
       my @EvalFields = &evalfields();
     my $fillflag=0;      my $fillflag=0;
       my $pretty_search_string = "<br />\n";
     # Clean up fields for safety      # Clean up fields for safety
     for my $field ('title','author','subject','keywords','url','version',      for my $field (@BasicFields,
    'creationdatestart_month','creationdatestart_day',                     'creationdatestart_month','creationdatestart_day',
    'creationdatestart_year','creationdateend_month',     'creationdatestart_year','creationdateend_month',
    'creationdateend_day','creationdateend_year',     'creationdateend_day','creationdateend_year',
    'lastrevisiondatestart_month','lastrevisiondatestart_day',     'lastrevisiondatestart_month','lastrevisiondatestart_day',
    'lastrevisiondatestart_year','lastrevisiondateend_month',     'lastrevisiondatestart_year','lastrevisiondateend_month',
    'lastrevisiondateend_day','lastrevisiondateend_year',     'lastrevisiondateend_day','lastrevisiondateend_year') {
    'notes','abstract','mime','language','owner',   $ENV{'form.'.$field}=~s/[^\w\/\s\(\)\=\-\"\']//g;
    'custommetadata','customshow') {          $ENV{'form.'.$field}=~s/(not\s*$|^\s*(and|or)|)//gi;
  $ENV{"form.$field"}=~s/[^\w\s\(\)\=\-\"\']//g;      }
     }      foreach ('mode','form','element') {
    # is this required?  Hmmm.
    next if (! exists($ENV{'form.'.$_}));
    $ENV{'form.'.$_}=&Apache::lonnet::unescape($ENV{'form.'.$_});
    $ENV{'form.'.$_}=~s/[^\w\/\s\(\)\=\-\"\']//g;
       }
       # Preprocess the category form element.
       $ENV{'form.category'} = 'any' if (! defined($ENV{'form.category'}) ||
                                         ref($ENV{'form.category'}));
       #
     # Check to see if enough information was filled in      # Check to see if enough information was filled in
     for my $field ('title','author','subject','keywords','url','version',      foreach my $field (@BasicFields) {
    'notes','abstract','mime','language','owner',   if (&filled($ENV{'form.'.$field})) {
    'custommetadata') {  
  if (&filled($ENV{"form.$field"})) {  
     $fillflag++;      $fillflag++;
  }   }
     }      }
     unless ($fillflag) {      foreach my $field (@StatsFields,@EvalFields) {
  &output_blank_field_error($r);          if (&filled($ENV{'form.'.$field.'_max'})) {
  return OK;              $fillflag++;
           }
           if (&filled($ENV{'form.'.$field.'_min'})) {
               $fillflag++;
           }
     }      }
   
       for my $field ('lowestgradelevel','highestgradelevel') {
           if ( $ENV{'form.'.$field} =~ /^\d+$/ &&
                $ENV{'form.'.$field} > 0) {
               $fillflag++;
           }
       }
       if (! $fillflag) {
    &output_blank_field_error($r,$closebutton,
                                     'phase=disp_adv',$hidden_fields);
    return ;
       }
     # Turn the form input into a SQL-based query      # Turn the form input into a SQL-based query
     my $query='';      my $query='';
   
     my @queries;      my @queries;
       my $font = '<font color="#800000" face="helvetica">';
     # Evaluate logical expression AND/OR/NOT phrase fields.      # Evaluate logical expression AND/OR/NOT phrase fields.
     foreach my $field ('title','author','subject','notes','abstract','url',      foreach my $field (@BasicFields) {
        'keywords','version','owner') {  
  if ($ENV{'form.'.$field}) {   if ($ENV{'form.'.$field}) {
     push @queries,&build_SQL_query($field,$ENV{'form.'.$field});              my $searchphrase = $ENV{'form.'.$field};
  }              $pretty_search_string .= $font."$field</font> contains <b>".
                   $searchphrase."</b>";
               if ($ENV{'form.'.$field.'_related'}) {
                   my @New_Words;
                   ($searchphrase,@New_Words) = &related_version($searchphrase);
                   if (@New_Words) {
                       $pretty_search_string .= " with related words: ".
                           "<b>@New_Words</b>.";
                   } else {
                       $pretty_search_string .= " with no related words.";
                   }
               }
               $pretty_search_string .= "<br />\n";
       push @queries,&build_SQL_query($field,$searchphrase);
           }
     }      }
       #
       # Make the 'mime' from 'form.category' and 'form.extension'
       #
       my $searchphrase;
       if (exists($ENV{'form.category'})    && 
           $ENV{'form.category'} !~ /^\s*$/ &&
           $ENV{'form.category'} ne 'any')     {
           my @extensions = &Apache::loncommon::filecategorytypes
                                                      ($ENV{'form.category'});
           if (scalar(@extensions) > 0) {
               $searchphrase = join(' OR ',@extensions);
           }
       }
       if (defined($searchphrase)) {
           push @queries,&build_SQL_query('mime',$searchphrase);
           $pretty_search_string .=$font.'mime</font> contains <b>'.
               $searchphrase.'</b><br />';
       }
       #
     # Evaluate option lists      # Evaluate option lists
       if ($ENV{'form.lowestgradelevel'}        &&
           $ENV{'form.lowestgradelevel'} ne '0' &&
           $ENV{'form.lowestgradelevel'} =~ /^\d+$/) {
    push(@queries,
                '(lowestgradelevel>='.$ENV{'form.lowestgradelevel'}.')');
           $pretty_search_string.="lowestgradelevel>=".
               $ENV{'form.lowestgradelevel'}."<br />\n";
       }
       if ($ENV{'form.highestgradelevel'}        &&
           $ENV{'form.highestgradelevel'} ne '0' &&
           $ENV{'form.highestgradelevel'} =~ /^\d+$/) {
    push(@queries,
                '(highestgradelevel<='.$ENV{'form.highestgradelevel'}.')');
           $pretty_search_string.="highestgradelevel<=".
               $ENV{'form.highestgradelevel'}."<br />\n";
       }
     if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') {      if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') {
  push @queries,"(language like \"$ENV{'form.language'}\")";   push @queries,"(language like \"$ENV{'form.language'}\")";
     }          $pretty_search_string.=$font."language</font>= ".
     if ($ENV{'form.mime'} and $ENV{'form.mime'} ne 'any') {              &Apache::loncommon::languagedescription($ENV{'form.language'}).
  push @queries,"(mime like \"$ENV{'form.mime'}\")";                  "<br />\n";
     }      }
     if ($ENV{'form.copyright'} and $ENV{'form.copyright'} ne 'any') {      if ($ENV{'form.copyright'} and $ENV{'form.copyright'} ne 'any') {
  push @queries,"(copyright like \"$ENV{'form.copyright'}\")";   push @queries,"(copyright like \"$ENV{'form.copyright'}\")";
           $pretty_search_string.=$font."copyright</font> = ".
               &Apache::loncommon::copyrightdescription($ENV{'form.copyright'}).
                   "<br \>\n";
       }
       #
       # Statistics
       foreach my $field (@StatsFields,@EvalFields) {
           my ($min,$max);
           if (exists($ENV{'form.'.$field.'_min'}) && 
               $ENV{'form.'.$field.'_min'} ne '') {
               $min = $ENV{'form.'.$field.'_min'};
           }
           if (exists($ENV{'form.'.$field.'_max'}) &&
               $ENV{'form.'.$field.'_max'} ne '') {
               $max = $ENV{'form.'.$field.'_max'};
           }
           next if (! defined($max) && ! defined($min));
           if (defined($min) && defined($max)) {
               ($min,$max) = sort {$a <=>$b} ($min,$max);
           }
           if (defined($min) && $min =~ /^(\d+\.\d+|\d+|\.\d+)$/) {
               push(@queries,'('.$field.'>'.$min.')');
               $pretty_search_string.=$font.$field.'</font>&gt;'.$min.'<br />';
           }
           if (defined($max) && $max =~ /^(\d+\.\d+|\d+|\.\d+)$/) {
               push(@queries,'('.$field.'<'.$max.')');
               $pretty_search_string.=$font.$field.'</font>&lt;'.$max.'<br />';
           }
     }      }
       #
     # Evaluate date windows      # Evaluate date windows
     my $datequery=&build_date_queries(      my $cafter =
  $ENV{'form.creationdatestart_month'},          &Apache::lonhtmlcommon::get_date_from_form('creationdate1');
  $ENV{'form.creationdatestart_day'},      my $cbefore = 
  $ENV{'form.creationdatestart_year'},          &Apache::lonhtmlcommon::get_date_from_form('creationdate2');
  $ENV{'form.creationdateend_month'},      if ($cafter > $cbefore) {
  $ENV{'form.creationdateend_day'},          my $tmp = $cafter;
  $ENV{'form.creationdateend_year'},          $cafter = $cbefore;
  $ENV{'form.lastrevisiondatestart_month'},          $cbefore = $tmp;
  $ENV{'form.lastrevisiondatestart_day'},      }
  $ENV{'form.lastrevisiondatestart_year'},      my $mafter = 
  $ENV{'form.lastrevisiondateend_month'},          &Apache::lonhtmlcommon::get_date_from_form('revisiondate1');
  $ENV{'form.lastrevisiondateend_day'},      my $mbefore =
  $ENV{'form.lastrevisiondateend_year'},          &Apache::lonhtmlcommon::get_date_from_form('revisiondate2');
  );      if ($mafter > $mbefore) {
     # Test to see if date windows are legitimate          my $tmp = $mafter;
     if ($datequery=~/^Incorrect/) {          $mafter = $mbefore;
  &output_date_error($r,$datequery);          $mbefore = $tmp;
  return OK;      }
     }      my ($datequery,$error,$prettydate)=&build_date_queries($cafter,$cbefore,
     elsif ($datequery) {                                                             $mafter,$mbefore);
       if (defined($error)) {
           &output_date_error($r,$error,$closebutton,$hidden_fields);
       } elsif (defined($datequery)) {
           # Here is where you would set up pretty_search_string to output
           # date query information.
           $pretty_search_string .= '<br />'.$prettydate.'<br />';
  push @queries,$datequery;   push @queries,$datequery;
     }      }
       #
     # Process form information for custom metadata querying      # Process form information for custom metadata querying
     my $customquery='';      my $customquery=undef;
     if ($ENV{'form.custommetadata'}) {      ##
  $customquery=&build_custommetadata_query('custommetadata',      ## The custom metadata search was removed q long time ago mostly 
       $ENV{'form.custommetadata'});      ## because I was unable to figureout exactly how it worked and could
     }      ## not imagine people actually using it.  MH
     my $customshow='';      ##
     if ($ENV{'form.customshow'}) {      # if ($ENV{'form.custommetadata'}) {
  $customshow=$ENV{'form.customshow'};      #    $pretty_search_string .=$font."Custom Metadata Search</font>: <b>".
  $customshow=~s/[^\w\s]//g;      #    $ENV{'form.custommetadata'}."</b><br />\n";
  my @fields=split(/\s+/,$customshow);      #    $customquery=&build_custommetadata_query('custommetadata',
  $customshow=join(" ",@fields);      #                                             $ENV{'form.custommetadata'});
     }      # }
     # Send query statements over the network to be processed by either the SQL      my $customshow=undef;
     # database or a recursive scheme of 'grep'-like actions (for custom      # if ($ENV{'form.customshow'}) {
     # metadata).      # $pretty_search_string .=$font."Custom Metadata Display</font>: <b>".
       #                         $ENV{'form.customshow'}."</b><br />\n";
       #    $customshow=$ENV{'form.customshow'};
       #    $customshow=~s/[^\w\s]//g;
       #    my @fields=split(/\s+/,$customshow);
       #    $customshow=join(" ",@fields);
       # }
       ##
       ## Deal with restrictions to given domains
       ## 
       my ($libraries_to_query,$pretty_domains_string) = 
           &parse_domain_restrictions();
       $pretty_search_string .= $pretty_domains_string."<br />\n";
       #
     if (@queries) {      if (@queries) {
  $query=join(" AND ",@queries);   $query="select * from metadata where ".join(" AND ",@queries);
  $query="select * from metadata where $query";      } elsif ($customquery) {
  my $reply; # reply hash reference          $query = '';
  unless ($customquery or $customshow) {      }
     $reply=&Apache::lonnet::metadata_query($query);  #    &Apache::lonnet::logthis('query = '.$/.$query);
  }      return ($query,$customquery,$customshow,$libraries_to_query,
  else {              $pretty_search_string);
     $reply=&Apache::lonnet::metadata_query($query,  }
    $customquery,$customshow);  
  }  sub parse_domain_restrictions {
  &output_results('Advanced',$r,$envhash,$customquery,$reply);      my $libraries_to_query = undef;
       # $ENV{'form.domains'} can be either a scalar or an array reference.
       # We need an array.
       if (! exists($ENV{'form.domains'}) || $ENV{'form.domains'} eq '') {
           return (undef,'');
       }
       my @allowed_domains;
       if (ref($ENV{'form.domains'})) {
           @allowed_domains =  @{$ENV{'form.domains'}};
       } else {
           @allowed_domains = ($ENV{'form.domains'});
       }
       #
       my %domain_hash = ();
       my $pretty_domains_string;
       foreach (@allowed_domains) {
           $domain_hash{$_}++;
       }
       if ($domain_hash{'any'}) {
           $pretty_domains_string = "In all LON-CAPA domains.";
       } else {
           if (@allowed_domains > 1) {
               $pretty_domains_string = "In LON-CAPA domains:";
           } else {
               $pretty_domains_string = "In LON-CAPA domain ";
           }
           foreach (sort @allowed_domains) {
               $pretty_domains_string .= "<b>".$_."</b> ";
           }
           foreach (keys(%Apache::lonnet::libserv)) {
               if (exists($domain_hash{$Apache::lonnet::hostdom{$_}})) {
                   push @$libraries_to_query,$_;
               }
           }
     }      }
     elsif ($customquery) {      return ($libraries_to_query,$pretty_domains_string);
  my $reply; # reply hash reference  }
  $reply=&Apache::lonnet::metadata_query('',  
        $customquery,$customshow);  ######################################################################
  &output_results('Advanced',$r,$envhash,$customquery,$reply);  ######################################################################
     }  
     # should not get to this point  =pod 
     return 'Error.  Should not have gone to this point.';  
 }  =item &parse_basic_search() 
   
 # --------------------------------------------------- Performing a basic search  Parse the basic search form and return a scalar containing an sql query.
 sub basicsearch {  
     my ($r,$envhash)=@_;  =cut
     my %ENV=%{$envhash};  
   ######################################################################
   ######################################################################
   sub parse_basic_search {
       my ($r,$closebutton)=@_;
       #
     # Clean up fields for safety      # Clean up fields for safety
     for my $field ('basicexp') {      for my $field ('basicexp') {
  $ENV{"form.$field"}=~s/[^\w\s\(\)\-]//g;   $ENV{"form.$field"}=~s/[^\w\s\(\)\-]//g;
     }      }
       foreach ('mode','form','element') {
     # Check to see if enough is filled in   # is this required?  Hmmm.
     unless (&filled($ENV{'form.basicexp'})) {   next unless (exists($ENV{"form.$_"}));
  &output_blank_field_error($r);   $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
    $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
       }
       my ($libraries_to_query,$pretty_domains_string) = 
           &parse_domain_restrictions();
       #
       # Check to see if enough of a query is filled in
       my $search_string = $ENV{'form.basicexp'};
       $search_string =~ s/(not\s*$|^\s*(and|or)|)//gi;
       if (! &filled($search_string)) {
    &output_blank_field_error($r,$closebutton,'phase=disp_basic');
  return OK;   return OK;
     }      }
       my $pretty_search_string = '<b>'.$ENV{'form.basicexp'}.'</b>';
       if ($ENV{'form.related'}) {
           my @New_Words;
           ($search_string,@New_Words) = &related_version($ENV{'form.basicexp'});
           if (@New_Words) {
               $pretty_search_string .= " with related words: <b>@New_Words</b>.";
           } else {
               $pretty_search_string .= " with no related words.";
           }
       }
       #
     # Build SQL query string based on form page      # Build SQL query string based on form page
     my $query='';      my $query='';
     my $concatarg=join(',"    ",',      my $concatarg=join(',',
        ('title', 'author', 'subject', 'notes', 'abstract'));         ('title', 'author', 'subject', 'notes', 'abstract',
                           'keywords'));
     $concatarg='title' if $ENV{'form.titleonly'};      $concatarg='title' if $ENV{'form.titleonly'};
       $query=&build_SQL_query('concat_ws(" ",'.$concatarg.')',$search_string);
       if (defined($pretty_domains_string) && $pretty_domains_string ne '') {
           $pretty_search_string .= ' '.$pretty_domains_string;
       }
       $pretty_search_string .= "<br />\n";
       my $final_query = 'SELECT * FROM metadata WHERE '.$query;
       # &Apache::lonnet::logthis($final_query);
       return ($final_query,$pretty_search_string,
               $libraries_to_query);
   }
   
     $query=&build_SQL_query('concat('.$concatarg.')',$ENV{'form.'.'basicexp'});  ######################################################################
   ######################################################################
   
     # Get reply (either a hash reference to filehandles or bad connection)  =pod 
     my $reply=&Apache::lonnet::metadata_query('select * from metadata where '.$query);  
   
     # Output search results  =item &related_version()
   
     &output_results('Basic',$r,$envhash,$query,$reply);  Modifies an input string to include related words.  Words in the string
   are replaced with parenthesized lists of 'OR'd words.  For example
   "torque" is replaced with "(torque OR word1 OR word2 OR ...)".  
   
     return OK;  Note: Using this twice on a string is probably silly.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub related_version {
       my $search_string = shift;
       my $result = $search_string;
       my %New_Words = ();
       while ($search_string =~ /(\w+)/cg) {
           my $word = $1;
           next if (lc($word) =~ /\b(or|and|not)\b/);
           my @Words = &Apache::loncommon::get_related_words($word);
           @Words = ($#Words>4? @Words[0..4] : @Words);
           foreach (@Words) { $New_Words{$_}++;}
           my $replacement = join " OR ", ($word,@Words);
           $result =~ s/(\b)$word(\b)/$1($replacement)$2/g;
       }
       return $result,sort(keys(%New_Words));
 }  }
   
 # ------------------------------------------------------------- build_SQL_query  ######################################################################
   ######################################################################
   
   =pod 
   
   =item &build_SQL_query() 
   
   Builds a SQL query string from a logical expression with AND/OR keywords
   using Text::Query and &recursive_SQL_query_builder()
   
   =cut
   
   ######################################################################
   ######################################################################
 sub build_SQL_query {  sub build_SQL_query {
     my ($field_name,$logic_statement)=@_;      my ($field_name,$logic_statement)=@_;
     my $q=new Text::Query('abc',      my $q=new Text::Query('abc',
Line 778  sub build_SQL_query { Line 1570  sub build_SQL_query {
     return $sql_query;      return $sql_query;
 }  }
   
 # ------------------------------------------------- build custom metadata query  ######################################################################
   ######################################################################
   
   =pod 
   
   =item &build_custommetadata_query() 
   
   Constructs a custom metadata query using a rather heinous regular
   expression.
   
   =cut
   
   ######################################################################
   ######################################################################
 sub build_custommetadata_query {  sub build_custommetadata_query {
     my ($field_name,$logic_statement)=@_;      my ($field_name,$logic_statement)=@_;
     my $q=new Text::Query('abc',      my $q=new Text::Query('abc',
Line 788  sub build_custommetadata_query { Line 1593  sub build_custommetadata_query {
     my $matchexp=${$q}{'-parse'}{'-build'}{'matchstring'};      my $matchexp=${$q}{'-parse'}{'-build'}{'matchstring'};
     # quick fix to change literal into xml tag-matching      # quick fix to change literal into xml tag-matching
     # will eventually have to write a separate builder module      # will eventually have to write a separate builder module
     my $oldmatchexp=$matchexp;      # wordone=wordtwo becomes\<wordone\>[^\<] *wordtwo[^\<]*\<\/wordone\>
     $matchexp=~s/(\w+)\\\=([\w\\\+]+)/\\\<$1\\\>\[\^\\\<\]\*$2\[\^\\\<\]\*\\\<\\\/$1\\\>/g;      $matchexp =~ s/(\w+)\\=([\w\\\+]+)?# wordone=wordtwo is changed to 
                    /\\<$1\\>?#           \<wordone\>
                      \[\^\\<\]?#        [^\<]         
                      \*$2\[\^\\<\]?#           *wordtwo[^\<]
                      \*\\<\\\/$1\\>?#                        *\<\/wordone\>
                      /g;
     return $matchexp;      return $matchexp;
 }  }
   
 # - Recursively parse a reverse notation expression into a SQL query expression  ######################################################################
   ######################################################################
   
   =pod 
   
   =item &recursive_SQL_query_build() 
   
   Recursively constructs an SQL query.  Takes as input $dkey and $pattern.
   
   =cut
   
   ######################################################################
   ######################################################################
 sub recursive_SQL_query_build {  sub recursive_SQL_query_build {
     my ($dkey,$pattern)=@_;      my ($dkey,$pattern)=@_;
     my @matches=($pattern=~/(\[[^\]|\[]*\])/g);      my @matches=($pattern=~/(\[[^\]|\[]*\])/g);
     return $pattern unless @matches;      return $pattern unless @matches;
     foreach my $match (@matches) {      foreach my $match (@matches) {
  $match=~/\[ (\w+)\s(.*) \]/;          $match=~/\[ (\w+)\s(.*) \]/;
  my ($key,$value)=($1,$2);          my ($key,$value)=($1,$2);
  my $replacement='';          my $replacement='';
  if ($key eq 'literal') {          if ($key eq 'literal') {
     $replacement="($dkey like \"\%$value\%\")";              $replacement="($dkey LIKE \"\%$value\%\")";
  }          } elsif (lc($key) eq 'not') {
  elsif ($key eq 'not') {              $value=~s/LIKE/NOT LIKE/;
     $value=~s/like/not like/;  #          $replacement="($dkey not like $value)";
 #    $replacement="($dkey not like $value)";              $replacement="$value";
     $replacement="$value";          } elsif ($key eq 'and') {
  }              $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
  elsif ($key eq 'and') {              $replacement="($1 AND $2)";
     $value=~/(.*[\"|\)]) ([|\(|\^].*)/;   } elsif ($key eq 'or') {
     $replacement="($1 AND $2)";              $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
  }              $replacement="($1 OR $2)";
  elsif ($key eq 'or') {  
     $value=~/(.*[\"|\)]) ([|\(|\^].*)/;  
     $replacement="($1 OR $2)";  
  }   }
  substr($pattern,   substr($pattern,
        index($pattern,$match),                 index($pattern,$match),
        length($match),                 length($match),
        $replacement                 $replacement);
        );  
     }      }
     &recursive_SQL_query_build($dkey,$pattern);      &recursive_SQL_query_build($dkey,$pattern);
 }  }
   
 # ------------------------------------------------------------ Build date query  ######################################################################
   ######################################################################
   
   =pod 
   
   =item &build_date_queries() 
   
   Builds a SQL logic query to check time/date entries.
   Also reports errors (check for /^Incorrect/).
   
   =cut
   
   ######################################################################
   ######################################################################
 sub build_date_queries {  sub build_date_queries {
     my ($cmonth1,$cday1,$cyear1,$cmonth2,$cday2,$cyear2,      my ($cafter,$cbefore,$mafter,$mbefore) = @_;
  $lmonth1,$lday1,$lyear1,$lmonth2,$lday2,$lyear2)=@_;      my ($result,$error,$pretty_string);
     my @queries;      #
     if ($cmonth1 or $cday1 or $cyear1 or $cmonth2 or $cday2 or $cyear2) {      # Verify the input
  unless ($cmonth1 and $cday1 and $cyear1 and      if (! defined($cafter) && ! defined($cbefore) &&
  $cmonth2 and $cday2 and $cyear2) {          ! defined($mafter) && ! defined($mbefore)) {
     return "Incorrect entry for the creation date.  You must specify ".          # This is an okay situation, so return undef for the error
    "a starting month, day, and year and an ending month, ".          return (undef,undef,undef);
    "day, and year.";      }
  }      if ((defined($cafter)  && ! defined($cbefore)) ||
  my $cnumeric1=sprintf("%d%2d%2d",$cyear1,$cmonth1,$cday1);          (defined($cbefore) && ! defined($cafter))) {
  $cnumeric1+=0;          # This is bad, so let them know
  my $cnumeric2=sprintf("%d%2d%2d",$cyear2,$cmonth2,$cday2);          $error = &mt('Incorrect entry for the creation date.  '.
  $cnumeric2+=0;                      'You must specify both the beginning and ending dates.');
  if ($cnumeric1>$cnumeric2) {      }
     return "Incorrect entry for the creation date.  The starting ".      if (! defined($error) && 
    "date must occur before the ending date.";          ((defined($mafter)  && ! defined($mbefore)) ||
  }          (defined($mbefore) && ! defined($mafter)))) {
  my $cquery="(creationdate BETWEEN '$cyear1-$cmonth1-$cday1' AND '".          # This is also bad, so let them know
            "$cyear2-$cmonth2-$cday2 23:59:59')";          $error = &mt('Incorrect entry for the last revision date.  '.
  push @queries,$cquery;                       'You must specify both the beginning and ending dates.');
     }      }
     if ($lmonth1 or $lday1 or $lyear1 or $lmonth2 or $lday2 or $lyear2) {      if (! defined($error)) {
  unless ($lmonth1 and $lday1 and $lyear1 and          #
  $lmonth2 and $lday2 and $lyear2) {          # Build the queries
     return "Incorrect entry for the last revision date.  You must ".          my @queries;
    "specify a starting month, day, and year and an ending ".          if (defined($cbefore) && defined($cafter)) {
    "month, day, and year.";              my (undef,undef,undef,$caday,$camon,$cayear) = localtime($cafter);
  }              my (undef,undef,undef,$cbday,$cbmon,$cbyear) = localtime($cbefore);
  my $lnumeric1=sprintf("%d%2d%2d",$lyear1,$lmonth1,$lday1);              # Correct for year being relative to 1900
  $lnumeric1+=0;              $cayear+=1900; $cbyear+=1900;
  my $lnumeric2=sprintf("%d%2d%2d",$lyear2,$lmonth2,$lday2);              my $cquery=
  $lnumeric2+=0;                  '(creationdate BETWEEN '.
  if ($lnumeric1>$lnumeric2) {                  "'".$cayear.'-'.$camon.'-'.$caday."'".
     return "Incorrect entry for the last revision date.  The ".                  ' AND '.
    "starting date must occur before the ending date.";                  "'".$cbyear.'-'.$cbmon.'-'.$cbday." 23:59:59')";
  }              $pretty_string .= '<br />' if (defined($pretty_string));
  my $lquery="(lastrevisiondate BETWEEN '$lyear1-$lmonth1-$lday1' AND '".              $pretty_string .= 
            "$lyear2-$lmonth2-$lday2 23:59:59')";                  &mt('created between [_1] and [_2]',
  push @queries,$lquery;                      &Apache::lonlocal::locallocaltime($cafter),
     }                      &Apache::lonlocal::locallocaltime($cbefore+24*60*60-1));
     if (@queries) {              push(@queries,$cquery);
  return join(" AND ",@queries);              $pretty_string =~ s/ 00:00:00//g;
           }
           if (defined($mbefore) && defined($mafter)) {
               my (undef,undef,undef,$maday,$mamon,$mayear) = localtime($mafter);
               my (undef,undef,undef,$mbday,$mbmon,$mbyear) = localtime($mbefore);
               # Correct for year being relative to 1900
               $mayear+=1900; $mbyear+=1900;
               my $mquery=
                   '(lastrevisiondate BETWEEN '.
                   "'".$mayear.'-'.$mamon.'-'.$maday."'".
                   ' AND '.
                   "'".$mbyear.'-'.$mbmon.'-'.$mbday." 23:59:59')";
               push(@queries,$mquery);
               $pretty_string .= '<br />' if (defined($pretty_string));
               $pretty_string .= 
                   &mt('last revised between [_1] and [_2]',
                       &Apache::lonlocal::locallocaltime($mafter),
                       &Apache::lonlocal::locallocaltime($mbefore+24*60*60-1));
               $pretty_string =~ s/ 00:00:00//g;
           }
           if (@queries) {
               $result .= join(" AND ",@queries);
           }
     }      }
     return '';      return ($result,$error,$pretty_string);
 }  }
   
 # ----------------------------- format and output results based on a reply list  ######################################################################
 # There are two windows that this function writes to.  The main search  ######################################################################
 # window ("srch") has a listing of the results.  A secondary window ("popwin")  
 # gives the status of the network search (time elapsed, number of machines  
 # contacted, etc.)  
 sub output_results {  
     my ($mode,$r,$envhash,$query,$replyref)=@_;  
     my %ENV=%{$envhash};  
     my %rhash=%{$replyref};  
     my $compiledresult='';  
     my $timeremain=30;  
     my $elapsetime=0;  
     my $resultflag=0;  
     my $tflag=1;  
   
     # make query information persistent to allow for subsequent revision  =pod
     my $persistent=&make_persistent();  
   
     # output beginning of search page  =item &copyright_check()
  $r->print(<<BEGINNING);  
   Inputs: $Metadata, a hash pointer of metadata for a resource.
   
   Returns: 1 if the resource is available to the user making the query, 
            0 otherwise.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub copyright_check {
       my $Metadata = shift;
       # Check copyright tags and skip results the user cannot use
       my (undef,undef,$resdom,$resname) = split('/',
                                                 $Metadata->{'url'});
       # Check for priv
       if (($Metadata->{'copyright'} eq 'priv') && 
           (($ENV{'user.name'} ne $resname) &&
            ($ENV{'user.domain'} ne $resdom))) {
           return 0;
       }
       # Check for domain
       if (($Metadata->{'copyright'} eq 'domain') &&
           ($ENV{'user.domain'} ne $resdom)) {
           return 0;
       }
       return 1;
   }
   
   ######################################################################
   ######################################################################
   
   =pod
   
   =item &ensure_db_and_table()
   
   Ensure we can get lonmysql to connect to the database and the table we
   need exists.
   
   Inputs: $r, table id
   
   Returns: undef on error, 1 if the table exists.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub ensure_db_and_table {
       my ($r,$table) = @_;
       ##
       ## Sanity check the table id.
       ##
       if (! defined($table) || $table eq '' || $table =~ /\D/ ) {
           $r->print("Unable to retrieve search results.  ".
                     "Unable to determine the table results were stored in.  ".
                     "</body></html>");
           return undef;
       }
       ##
       ## Make sure we can connect and the table exists.
       ##
       my $connection_result = &Apache::lonmysql::connect_to_db();
       if (!defined($connection_result)) {
           $r->print("Unable to connect to the MySQL database where your results".
                     " are stored. </body></html>");
           &Apache::lonnet::logthis("lonsearchcat: unable to get lonmysql to".
                                    " connect to database.");
           &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
           return undef;
       }
       my $table_check = &Apache::lonmysql::check_table($table);
       if (! defined($table_check)) {
           $r->print("A MySQL error has occurred.</form></body></html>");
           &Apache::lonnet::logthis("lonmysql was unable to determine the status".
                                    " of table ".$table);
           return undef;
       } elsif (! $table_check) {
           $r->print("The table of results could not be found.");
           &Apache::lonnet::logthis("The user requested a table, ".$table.
                                    ", that could not be found.");
           return undef;
       }
       return 1;
   }
   
   ######################################################################
   ######################################################################
   
   =pod
   
   =item &print_sort_form()
   
   The sort feature is not implemented at this time.  This form just prints 
   a link to change the search query.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub print_sort_form {
       my ($r,$pretty_query_string) = @_;
       my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
       ##
       my %SortableFields=&Apache::lonlocal::texthash( 
            id        => 'Default',
            title     => 'Title',
            author    => 'Author',
            subject   => 'Subject',
            url       => 'URL',
            version   => 'Version Number',
            mime      => 'Mime type',
            lang      => 'Language',
            owner     => 'Owner/Publisher',
            copyright => 'Copyright',
            hostname  => 'Host',
            creationdate     => 'Creation Date',
            lastrevisiondate => 'Revision Date'
        );
       ##
       my $table = $ENV{'form.table'};
       return if (! &ensure_db_and_table($r,$table));
       ##
       ## Get the number of results 
       ##
       my $total_results = &Apache::lonmysql::number_of_rows($table);
       if (! defined($total_results)) {
           $r->print("A MySQL error has occurred.</form></body></html>");
           &Apache::lonnet::logthis("lonmysql was unable to determine the number".
                                    " of rows in table ".$table);
           &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
           return;
       }
       my $result;
       $result.=<<END;
 <html>  <html>
 <head>  <head>
 <title>The LearningOnline Network with CAPA</title>  <script>
 BEGINNING      function change_sort() {
           var newloc = "/adm/searchcat?phase=results";
           newloc += "&persistent_db_id=$ENV{'form.persistent_db_id'}";
           newloc += "&sortby=";
           newloc += document.forms.statusform.elements.sortby.value;
           parent.resultsframe.location= newloc;
       }
   </script>
   <title>Results</title>
   </head>
   $bodytag
   <form name="statusform" action="" method="post">
   <input type="hidden" name="Queue" value="" />
   END
   
   #<h2>Sort Results</h2>
   #Sort by: <select size="1" name="sortby" onchange="javascript:change_sort();">
   #    $ENV{'form.sortby'} = 'id' if (! defined($ENV{'form.sortby'}));
   #    foreach (keys(%SortableFields)) {
   #        $result.="<option name=\"$_\"";
   #        if ($_ eq $ENV{'form.sortby'}) {
   #            $result.=" selected ";
   #        }
   #        $result.=" >$SortableFields{$_}</option>\n";
   #    }
   #    $result.="</select>\n";
       my $revise = &revise_button();
       $result.=<<END;
   <p>
   There are $total_results matches to your query. $revise
   </p><p>
   Search:$pretty_query_string
   </p>
   </form>
   </body>
   </html>
   END
       $r->print($result);
       return;
   }
   
   #####################################################################
   #####################################################################
   
   =pod
   
   =item MySQL Table Description
   
   MySQL table creation requires a precise description of the data to be
   stored.  The use of the correct types to hold data is vital to efficient
   storage and quick retrieval of records.  The columns must be described in
   the following format:
   
   =cut
   
   #####################################################################
   #####################################################################
   #
   # These should probably be scoped but I don't have time right now...
   #
   my @Datatypes;
   my @Fullindicies;
       
   ######################################################################
   ######################################################################
   
   =pod
   
   =item &create_results_table()
   
   Creates the table of search results by calling lonmysql.  Stores the
   table id in $ENV{'form.table'}
   
   Inputs: none.
   
   Returns: the identifier of the table on success, undef on error.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub set_up_table_structure {
       my ($datatypes,$fullindicies) = 
           &LONCAPA::lonmetadata::describe_metadata_storage();
       # Copy the table description before modifying it...
       @Datatypes = @{$datatypes};
       unshift(@Datatypes,{name => 'id',  
           type => 'MEDIUMINT',
           restrictions => 'UNSIGNED NOT NULL',
           primary_key  => 'yes',
           auto_inc     => 'yes' });
       @Fullindicies = @{$fullindicies};
       return;
   }
   
   sub create_results_table {
       &set_up_table_structure();
       my $table = &Apache::lonmysql::create_table
           ( { columns => \@Datatypes,
               FULLTEXT => [{'columns' => \@Fullindicies},],
           } );
       if (defined($table)) {
           $ENV{'form.table'} = $table;
           return $table;
       } 
       return undef; # Error...
   }
   
   ######################################################################
   ######################################################################
   
   =pod
   
   =item Search Status update functions
   
   Each of the following functions changes the values of one of the
   input fields used to display the search status to the user.  The names
   should be explanatory.
   
   Inputs: Apache request handler ($r), text to display.
   
   Returns: Nothing.
   
   =over 4
   
   =item &update_count_status()
   
   =item &update_status()
   
   =item &update_seconds()
   
   =back
   
   =cut
   
   ######################################################################
   ######################################################################
   sub update_count_status {
       my ($r,$text) = @_;
       $text =~ s/\'/\\\'/g;
       $r->print
           ("<script>document.statusform.count.value = ' $text'</script>\n");
       $r->rflush();
   }
   
   sub update_status {
       my ($r,$text) = @_;
       $text =~ s/\'/\\\'/g;
       $r->print
           ("<script>document.statusform.status.value = ' $text'</script>\n");
       $r->rflush();
   }
   
   {
       my $max_time  = 40;  # seconds for the search to complete
       my $start_time = 0;
       my $last_time = 0;
   
   sub reset_timing {
       $start_time = 0;
       $last_time = 0;
   }
   
   sub time_left {
       if ($start_time == 0) {
           $start_time = time;
       }
       my $time_left = $max_time - (time - $start_time);
       $time_left = 0 if ($time_left < 0);
       return $time_left;
   }
   
   sub update_seconds {
       my ($r) = @_;
       my $time = &time_left();
       if (($last_time-$time) > 0) {
           $r->print("<script>".
                     "document.statusform.seconds.value = '$time'".
                     "</script>\n");
           $r->rflush();
       }
       $last_time = $time;
   }
   
   }
   
   ######################################################################
   ######################################################################
   
   =pod
   
   =item &revise_button()
   
   Inputs: None
   
   Returns: html string for a 'revise search' button.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub revise_button {
       my $revise_phase = 'disp_basic';
       $revise_phase = 'disp_adv' if ($ENV{'form.searchmode'} eq 'advanced');
       my $newloc = '/adm/searchcat'.
           '?persistent_db_id='.$ENV{'form.persistent_db_id'}.
               '&cleargroupsort=1'.
               '&phase='.$revise_phase;
       my $result = qq{<input type="button" value="Revise search" name="revise"} .
           qq{ onClick="parent.location='$newloc';" /> };
       return $result;
   }
   
   ######################################################################
   ######################################################################
   
   =pod
   
   =item &run_search()
   
   Executes a search query by sending it the the other servers and putting the
   results into MySQL.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub run_search {
       my ($r,$query,$customquery,$customshow,$serverlist,$pretty_string) = @_;
       my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
       my $connection = $r->connection;
       #
       # Print run_search header
       #
       $r->print(<<END);
   <html>
   <head><title>Search Status</title></head>
   $bodytag
   <form name="statusform" action="" method="post">
   <input type="hidden" name="Queue" value="" />
   END
       # Check to see if $pretty_string has more than one carriage return.
       # Assume \n s are following <br /> s and truncate the value.
       # (there is probably a better way)...
       my @Lines = split /<br \/>/,$pretty_string;
       if (@Lines > 2) {
           $pretty_string = join '<br \>',(@Lines[0..2],'....<br />');
       }
       $r->print(&mt("Search: [_1]",$pretty_string));
       $r->rflush();
       #
       # Determine the servers we need to contact.
       my @Servers_to_contact;
       if (defined($serverlist)) {
           if (ref($serverlist) eq 'ARRAY') {
               @Servers_to_contact = @$serverlist;
           } else {
               @Servers_to_contact = ($serverlist);
           }
       } else {
           @Servers_to_contact = sort(keys(%Apache::lonnet::libserv));
       }
       my %Server_status;
       #
       # Check on the mysql table we will use to store results.
       my $table =$ENV{'form.table'};
       if (! defined($table) || $table eq '' || $table =~ /\D/ ) {
           $r->print("Unable to determine table id to store search results in.".
                     "The search has been aborted.</body></html>");
           return;
       }
       my $table_status = &Apache::lonmysql::check_table($table);
       if (! defined($table_status)) {
           $r->print("Unable to determine status of table.</body></html>");
           &Apache::lonnet::logthis("Bogus table id of $table for ".
                                    "$ENV{'user.name'} @ $ENV{'user.domain'}");
           &Apache::lonnet::logthis("lonmysql error = ".
                                    &Apache::lonmysql::get_error());
           return;
       }
       if (! $table_status) {
           &Apache::lonnet::logthis("lonmysql error = ".
                                    &Apache::lonmysql::get_error());
           &Apache::lonnet::logthis("lonmysql debug = ".
                                    &Apache::lonmysql::get_debug());
           &Apache::lonnet::logthis('table status = "'.$table_status.'"');
           $r->print("The table id,$table, we tried to use is invalid.".
                     "The search has been aborted.</body></html>");
           return;
       }
       ##
       ## Prepare for the big loop.
       my $hitcountsum;
       my $server; 
       my $status;
       my $revise = &revise_button();
       $r->print(<<END);
   <table>
   <tr><th>Status</th><th>Total Matches</th><th>Time Remaining</th><th></th></tr>
   <tr>
   <td><input type="text" name="status"  value="" size="30" /></td>
   <td><input type="text" name="count"   value="" size="10" /></td>
   <td><input type="text" name="seconds" value="" size="8" /></td>
   <td>$revise</td>
   </tr>
   </table>
   </form>
   END
       $r->rflush();
       &reset_timing();
       &update_seconds($r);
       &update_status($r,&mt('contacting [_1]',$Servers_to_contact[0]));
       while (&time_left() &&
              ((@Servers_to_contact) || keys(%Server_status))) {
           &update_seconds($r);
           #
           # Send out a search request
           if (@Servers_to_contact) {
               # Contact one server
               my $server = shift(@Servers_to_contact);
               &update_status($r,&mt('contacting [_1]',$server));
               my $reply=&Apache::lonnet::metadata_query($query,$customquery,
                                                         $customshow,[$server]);
               ($server) = keys(%$reply);
               $Server_status{$server} = $reply->{$server};
           } else {
               # wait a sec. to give time for files to be written
               # This sleep statement is here instead of outside the else 
               # block because we do not want to pause if we have servers
               # left to contact.  
               if (scalar (keys(%Server_status))) {
                   &update_status($r,
                          &mt('waiting on [_1]',join(' ',keys(%Server_status))));
               }
               sleep(1); 
           }
           #
           # Loop through the servers we have contacted but do not
           # have results from yet, looking for results.
           while (my ($server,$status) = each(%Server_status)) {
               last if ($connection->aborted());
               &update_seconds($r);
               if ($status eq 'con_lost') {
                   delete ($Server_status{$server});
                   next;
               }
               $status=~/^([\.\w]+)$/; 
              my $datafile=$r->dir_config('lonDaemons').'/tmp/'.$1;
               if (-e $datafile && ! -e "$datafile.end") {
                   &update_status($r,&mt('Receiving results from [_1]',$server));
                   next;
               }
               last if ($connection->aborted());
               if (-e "$datafile.end") {
                   &update_status($r,&mt('Reading results from [_1]',$server));
                   if (-z "$datafile") {
                       delete($Server_status{$server});
                       next;
                   }
                   my $fh;
                   if (!($fh=Apache::File->new($datafile))) { 
                       $r->print("Unable to open search results file for ".
                                     "server $server.  Omitting from search");
                       delete($Server_status{$server}); 
                      next;
                   }
                   # Read in the whole file.
                   while (my $result = <$fh>) {
                       last if ($connection->aborted());
                       #
                       # Records are stored one per line
                       chomp($result);
                       next if (! $result);
                       #
                       # Parse the result.
                       my %Fields = &parse_raw_result($result,$server);
                       $Fields{'hostname'} = $server;
                       #
                       # Skip based on copyright
                       next if (! &copyright_check(\%Fields));
                       #
                       # Store the result in the mysql database
                       my $result = &Apache::lonmysql::store_row($table,\%Fields);
                       if (! defined($result)) {
                           $r->print(&Apache::lonmysql::get_error());
                       }
                       #
                       $hitcountsum ++;
                       &update_seconds($r);
                       if ($hitcountsum % 50 == 0) {
                           &update_count_status($r,$hitcountsum);
                       }
                   }
                   $fh->close();
                   # $server is only deleted if the results file has been 
                   # found and (successfully) opened.  This may be a bad idea.
                   delete($Server_status{$server});
               }
               last if ($connection->aborted());
               &update_count_status($r,$hitcountsum);
           }
           last if ($connection->aborted());
           &update_seconds($r);
       }
       &update_status($r,&mt('Search Complete [_1]',$server));
       &update_seconds($r);
       #
       &Apache::lonmysql::disconnect_from_db(); # This is unneccessary
       #
       # We have run out of time or run out of servers to talk to and
       # results to get, so let the client know the top frame needs to be
       # loaded from /adm/searchcat
       $r->print("</body></html>");
       if ($ENV{'form.catalogmode'} ne 'groupsearch') {
           $r->print("<script>".
                         "window.location='/adm/searchcat?".
                         "phase=sort&".
                         "persistent_db_id=$ENV{'form.persistent_db_id'}';".
                     "</script>");
       }
       return;
   }
   
   ######################################################################
   ######################################################################
   
   =pod
   
   =item &prev_next_buttons()
   
   Returns html for the previous and next buttons on the search results page.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub prev_next_buttons {
       my ($current_min,$show,$total,$parms) = @_;
       return '' if ($show eq 'all'); # No links if you get them all at once.
       #
       # Create buttons
       my $buttons = '<input type="submit" name="prev" value="'.&mt('Prev').'" ';
       $buttons .= '/>';
       $buttons .= '&nbsp;'x3;
       $buttons .= '<input type="submit" name="reload" '.
           'value="'.&mt('Reload').'" />';
       $buttons .= '&nbsp;'x3;
       $buttons .= '<input type="submit" name="next" value="'.&mt('Next').'" ';
       $buttons .= '/>';
       return $buttons;
   }
   
   ######################################################################
   ######################################################################
   
   =pod
   
   =item &display_results()
   
   Prints the results out for selection and perusal.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub display_results {
       my ($r,$importbutton,$closebutton,$diropendb) = @_;
       my $connection = $r->connection;
       $r->print(&search_results_header($importbutton,$closebutton));
       ##
       ## Set viewing function
       ##
       my $viewfunction = $Views{$ENV{'form.viewselect'}};
       if (!defined($viewfunction)) {
           $r->print("Internal Error - Bad view selected.\n");
           $r->rflush();
           return;
       }
       ##
       ## $checkbox_num is a count of the number of checkboxes output on the 
       ## page this is used only during catalogmode=groupsearch.
       my $checkbox_num = 0;
       ##
       ## Get the catalog controls setup
       ##
       my $action = "/adm/searchcat?phase=results";
       ##
       ## Deal with groupsearch by opening the groupsearch db file.
       if ($ENV{'form.catalogmode'} eq 'groupsearch') {
           if (! tie(%groupsearch_db,'GDBM_File',$diropendb,
                     &GDBM_WRCREAT(),0640)) {
               $r->print('Unable to store import results.</form></body></html>');
               $r->rflush();
               return;
           } 
       }
       ##
       ## Prepare the table for querying
       my $table = $ENV{'form.table'};
       return if (! &ensure_db_and_table($r,$table));
       ##
       ## Get the number of results 
       my $total_results = &Apache::lonmysql::number_of_rows($table);
       if (! defined($total_results)) {
           $r->print("A MySQL error has occurred.</form></body></html>");
           &Apache::lonnet::logthis("lonmysql was unable to determine the number".
                                    " of rows in table ".$table);
           &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
           return;
       }
       ##
       ## Determine how many results we need to get
       $ENV{'form.start'} = 1  if (! exists($ENV{'form.start'}));
       $ENV{'form.show'}  = 20 if (! exists($ENV{'form.show'}));
       if (exists($ENV{'form.prev'})) {
           $ENV{'form.start'} -= $ENV{'form.show'};
       } elsif (exists($ENV{'form.next'})) {
           $ENV{'form.start'} += $ENV{'form.show'};
       }
       $ENV{'form.start'} = 1 if ($ENV{'form.start'}<1);
       $ENV{'form.start'} = $total_results if ($ENV{'form.start'}>$total_results);
       my $min = $ENV{'form.start'};
       my $max;
       if ($ENV{'form.show'} eq 'all') {
           $max = $total_results ;
       } else {
           $max = $min + $ENV{'form.show'} - 1;
           $max = $total_results if ($max > $total_results);
       }
       ##
       ## Output form elements
       $r->print(&hidden_field('table').
                 &hidden_field('phase').
                 &hidden_field('persistent_db_id').
                 &hidden_field('start')
                 );
       ##
       ## Output links (if necessary) for 'prev' and 'next' pages.
       $r->print
           ('<table width="100%"><tr><td width="50%" align="right">'.
            &prev_next_buttons($min,$ENV{'form.show'},$total_results).
            '</td><td align="right">'.
            &viewoptions().'</td></tr></table>'
            );
       if ($total_results == 0) {
           $r->print('<meta HTTP-EQUIV="Refresh" CONTENT="2">'.
                     '<h3>'.&mt('There are currently no results').'.</h3>'.
                     "</form></body></html>");
           return;
       } else {
           $r->print
               ("<center>Results $min to $max out of $total_results</center>\n");
       }
       ##
       ## Get results from MySQL table
       my @Results = &Apache::lonmysql::get_rows($table,
                                                 'id>='.$min.' AND id<='.$max);
       ##
       ## Loop through the results and output them.
       foreach my $row (@Results) {
           if ($connection->aborted()) {
               &cleanup();
               return;
           }
           my %Fields = %{&parse_row(@$row)};
           my $output="<p>\n";
           if (! defined($Fields{'title'}) || $Fields{'title'} eq '') {
               $Fields{'title'} = 'Untitled';
           }
           my $prefix=&catalogmode_output($Fields{'title'},$Fields{'url'},
                                          $Fields{'id'},$checkbox_num++);
           # Render the result into html
           $output.= &$viewfunction($prefix,%Fields);
           # Print them out as they come in.
           $r->print($output);
           $r->rflush();
       }
       if (@Results < 1) {
           $r->print(&mt("There were no results matching your query"));
       } else {
           $r->print
               ('<center>'.
                &prev_next_buttons($min,$ENV{'form.show'},$total_results,
                                   "table=".$ENV{'form.table'}.
                                   "&phase=results".
                                   "&persistent_db_id=".
                                   $ENV{'form.persistent_db_id'})
                ."</center>\n"
                );
       }
       $r->print("</form></body></html>");
       $r->rflush();
       untie %groupsearch_db if (tied(%groupsearch_db));
       return;
   }
   
   ######################################################################
   ######################################################################
   
   =pod
   
   =item &catalogmode_output($title,$url,$fnum,$checkbox_num)
   
   Returns html needed for the various catalog modes.  Gets inputs from
   $ENV{'form.catalogmode'}.  Stores data in %groupsearch_db.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub catalogmode_output {
       my $output = '';
       my ($title,$url,$fnum,$checkbox_num) = @_;
       if ($ENV{'form.catalogmode'} eq 'interactive') {
           $title=~ s/\'/\\\'/g;
           if ($ENV{'form.catalogmode'} eq 'interactive') {
               $output.=<<END 
   <font size='-1'><INPUT TYPE="button" NAME="returnvalues" VALUE="SELECT"
   onClick="javascript:select_data('$title','$url')">
   </font>
   END
           }
       } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {
           $groupsearch_db{"pre_${fnum}_link"}=$url;
           $groupsearch_db{"pre_${fnum}_title"}=$title;
           $output.=<<END;
   <font size='-1'>
   <input type="checkbox" name="returnvalues" value="SELECT"
   onClick="javascript:queue($checkbox_num,$fnum)" />
   </font>
   END
       }
       return $output;
   }
   ######################################################################
   ######################################################################
   
   =pod
   
   =item &parse_row()
   
   Parse a row returned from the database.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub parse_row {
       my @Row = @_;
       my %Fields;
       if (! scalar(@Datatypes)) {
           &set_up_table_structure();
       }
       for (my $i=0;$i<=$#Row;$i++) {
           $Fields{$Datatypes[$i]->{'name'}}=&Apache::lonnet::unescape($Row[$i]);
       }
       $Fields{'language'} = 
           &Apache::loncommon::languagedescription($Fields{'language'});
       $Fields{'copyrighttag'} =
           &Apache::loncommon::copyrightdescription($Fields{'copyright'});
       $Fields{'mimetag'} =
           &Apache::loncommon::filedescription($Fields{'mime'});
       return \%Fields;
   }
   
   ###########################################################
   ###########################################################
   
   =pod
   
   =item &parse_raw_result()
   
   Takes a line from the file of results and parse it.  Returns a hash 
   with keys according to column labels
   
   In addition, the following tags are set by calling the appropriate 
   lonnet function: 'language', 'copyrighttag', 'mimetag'.
   
   The 'title' field is set to "Untitled" if the title field is blank.
   
   'abstract' and 'keywords' are truncated to 200 characters.
   
   =cut
   
   ###########################################################
   ###########################################################
   sub parse_raw_result {
       my ($result,$hostname) = @_;
       # conclude from self to others regarding fields
       my %Fields=&LONCAPA::lonmetadata::metadata_col_to_hash
           (map {
               &Apache::lonnet::unescape($_);
           } (split(/\,/,$result)) );
       return %Fields;
   }
   
   ###########################################################
   ###########################################################
   
   =pod
   
   =item &handle_custom_fields()
   
   =cut
   
   ###########################################################
   ###########################################################
   sub handle_custom_fields {
       my @results = @{shift()};
       my $customshow='';
       my $extrashow='';
       my @customfields;
       if ($ENV{'form.customshow'}) {
           $customshow=$ENV{'form.customshow'};
           $customshow=~s/[^\w\s]//g;
           my @fields=map {
               "<font color=\"#008000\">$_:</font><!-- $_ -->";
           } split(/\s+/,$customshow);
           @customfields=split(/\s+/,$customshow);
           if ($customshow) {
               $extrashow="<ul><li>".join("</li><li>",@fields)."</li></ul>\n";
           }
       }
       my $customdata='';
       my %customhash;
       foreach my $result (@results) {
           if ($result=~/^(custom\=.*)$/) { # grab all custom metadata
               my $tmp=$result;
               $tmp=~s/^custom\=//;
               my ($k,$v)=map {&Apache::lonnet::unescape($_);
                           } split(/\,/,$tmp);
               $customhash{$k}=$v;
           }
       }
       return ($extrashow,\@customfields,\%customhash);
   }
   
   ######################################################################
   ######################################################################
   
   =pod
   
   =item &search_results_header()
   
   Output the proper html headers and javascript code to deal with different 
   calling modes.
   
   Takes most inputs directly from %ENV, except $mode.  
   
   =over 4
   
   =item $mode is either (at this writing) 'Basic' or 'Advanced'
   
   =back
   
   The following environment variables are checked:
   
   =over 4
   
   =item 'form.catalogmode' 
   
   Checked for 'interactive' and 'groupsearch'.
   
   =item 'form.mode'
   
   Checked for existance & 'edit' mode.
   
   =item 'form.form'
   
   Contains the name of the form that has the input fields to set
   
   =item 'form.element'
   
   the name of the input field to put the URL into
   
   =item 'form.titleelement'
   
   the name of the input field to put the title into
   
   =back
   
   =cut
   
   ######################################################################
   ######################################################################
   sub search_results_header {
       my ($importbutton,$closebutton) = @_;
       my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
       my $result = '';
       # output beginning of search page
     # conditional output of script functions dependent on the mode in      # conditional output of script functions dependent on the mode in
     # which the search was invoked      # which the search was invoked
         $r->print(<<SCRIPT) if $ENV{'form.catalogmode'} eq 'interactive';      if ($ENV{'form.catalogmode'} eq 'interactive'){
 <script>   if (! exists($ENV{'form.mode'}) || $ENV{'form.mode'} ne 'edit') {
               $result.=<<SCRIPT;
   <script type="text/javascript">
     function select_data(title,url) {      function select_data(title,url) {
  changeTitle(title);   changeTitle(title);
  changeURL(url);   changeURL(url);
  self.close();   parent.close();
     }      }
     function changeTitle(val) {      function changeTitle(val) {
  if (opener.inf.document.forms.resinfo.elements.t) {   if (parent.opener.inf.document.forms.resinfo.elements.t) {
     opener.inf.document.forms.resinfo.elements.t.value=val;      parent.opener.inf.document.forms.resinfo.elements.t.value=val;
  }   }
     }      }
     function changeURL(val) {      function changeURL(val) {
  if (opener.inf.document.forms.resinfo.elements.u) {   if (parent.opener.inf.document.forms.resinfo.elements.u) {
     opener.inf.document.forms.resinfo.elements.u.value=val;      parent.opener.inf.document.forms.resinfo.elements.u.value=val;
  }   }
     }      }
 </script>  </script>
 SCRIPT  SCRIPT
         $r->print(<<SCRIPT) if $ENV{'form.catalogmode'} eq 'groupsearch';          } elsif ($ENV{'form.mode'} eq 'edit') {
 <script>              my $form = $ENV{'form.form'};
     function select_data(title,url) {              my $element = $ENV{'form.element'};
  alert('DEBUG: Should be storing '+title+' and '+url);              my $titleelement = $ENV{'form.titleelement'};
       my $changetitle;
       if (!$titleelement) {
    $changetitle='function changeTitle(val) {}';
       } else {
       $changetitle=<<END;
   function changeTitle(val) {
       if (parent.targetwin.document) {
           parent.targetwin.document.forms["$form"].elements["$titleelement"].value=val;
       } else {
    var url = 'forms[\"$form\"].elements[\"$titleelement\"].value';
           alert("Unable to transfer data to "+url);
     }      }
     function queue(val) {  }
  if (eval("document.forms."+val+".filelink.checked")) {  END
     document.forms.results.acts.value+='1a'+val+'b';              }
  }  
  else {              $result.=<<SCRIPT;
     document.forms.results.acts.value+='0a'+val+'b';  <script type="text/javascript">
  }  function select_data(title,url) {
     }      changeURL(url);
     function select_group() {      changeTitle(title);
  alert('DEBUG: Should be moving on to group sorting stage'+' acts');      parent.close();
   }
   $changetitle
   function changeURL(val) {
       if (parent.targetwin.document) {
           parent.targetwin.document.forms["$form"].elements["$element"].value=val;
       } else {
    var url = 'forms[\"$form\"].elements[\"$element\"].value';
           alert("Unable to transfer data to "+url);
     }      }
   }
 </script>  </script>
 SCRIPT  SCRIPT
         $r->print(<<SCRIPT);                                            ;          }
 <script>      }
     function displayinfo(val) {      $result.=<<SCRIPT if $ENV{'form.catalogmode'} eq 'groupsearch';
  popwin.document.forms.popremain.sdetails.value=val;  <script type="text/javascript">
       function queue(checkbox_num,val) {
           if (document.forms.results.returnvalues.length != "undefined" &&
               typeof(document.forms.results.returnvalues.length) == "number") {
               if (document.forms.results.returnvalues[checkbox_num].checked) {
                   parent.statusframe.document.forms.statusform.elements.Queue.value +='1a'+val+'b';
               } else {
                   parent.statusframe.document.forms.statusform.elements.Queue.value +='0a'+val+'b';
               }
           } else {
               if (document.forms.results.returnvalues.checked) {
                   parent.statusframe.document.forms.statusform.elements.Queue.value +='1a'+val+'b';
               } else {
                   parent.statusframe.document.forms.statusform.elements.Queue.value +='0a'+val+'b';
               }
           }
       }
       function select_group() {
    parent.window.location=
       "/adm/groupsort?mode=$ENV{'form.mode'}&catalogmode=groupsearch&acts="+
       parent.statusframe.document.forms.statusform.elements.Queue.value;
     }      }
 </script>  </script>
 SCRIPT  SCRIPT
     $r->rflush();      $result.=<<END;
   
     # begin showing the cataloged results  
     $r->print(<<CATALOGBEGIN);  
 </head>  </head>
 <body bgcolor="#ffffff">  $bodytag
 <img align=right src=/adm/lonIcons/lonlogos.gif>  <form name="results" method="post" action="/adm/searchcat" >
 <h1>Search Catalog</h1>  <input type="hidden" name="Queue" value="" />
 CATALOGBEGIN  
         $r->print(<<CATALOGCONTROLS);  
 <form name='results' method="post" action="/adm/searchcat">  
 <input type='hidden' name='acts' value='' />  
 <input type='button' value='Revise search request'  
 onClick='this.form.submit();' />  
 $importbutton  $importbutton
 $closebutton  END
 $persistent      return $result;
 <hr />  }
 <h3>Search Query</h3>  
 CATALOGCONTROLS  
     if ($mode eq 'Basic') {  
  $r->print(<<RESULTS);  
 <p>  
 <b>Basic search:</b> $ENV{'form.basicexp'}  
 </p>  
 RESULTS  
     }  
     elsif ($mode eq 'Advanced') {  
  $r->print(<<RESULTS);  
 <p>  
 <b>Advanced search</b>  
 $query  
 </p>  
 RESULTS  
     }  
     $r->print('<h3>Search Results</h3>');  
     $r->rflush();  
     my $servernum=(keys %rhash)+0;  
   
     # define server grid (shows status of multiple machines)  ######################################################################
     my $hcinit;  ######################################################################
     my $grid="'<br />'+";  sub search_status_header {
     $grid.="\n";      my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
     my $sn=1;      return <<ENDSTATUS;
     for my $sk (sort keys %rhash) {  <html><head><title>Search Status</title></head>
  # '<a href="  $bodytag
  $grid.="'<a href=\"";  <h3>Search Status</h3>
  # javascript:displayinfo('+  Sending search request to LON-CAPA servers.<br />
  $grid.="javascript:opener.displayinfo('+";  ENDSTATUS
  # "'"+'key  }
  $grid.="\"'\"+'";  
  $grid.=$sk;  sub results_link {
  my $hc;      my $basic_link   = "/adm/searchcat?"."&table=".$ENV{'form.table'}.
  if ($rhash{$sk} eq 'con_lost') {          "&persistent_db_id=".$ENV{'form.persistent_db_id'};
     $hc="!!!BAD CONNECTION, CONTACT SYSTEM ADMINISTRATOR!!!";      my $results_link = $basic_link."&phase=results".
  }          "&pause=1"."&start=1";
  else {      return $results_link;
     $hc="'+\"'\"+\"+hc['$sk']+\"+\"'\"+'";  }
     $hcinit.="hc[\"$sk\"]=\"not yet connected...\";";  
  }  ######################################################################
  $grid.=" hitcount=".$hc;  ######################################################################
  $grid.=" domain=".$hostdomains{$sk};  sub print_frames_interface {
  $grid.=" IP=".$hostips{$sk};      my $r = shift;
  # '+"'"+'">'+      my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}.
  $grid.="'+\"'\"+')\">'+";          "&persistent_db_id=".$ENV{'form.persistent_db_id'};
  $grid.="\n";      my $run_search_link = $basic_link."&phase=run_search";
  $grid.="'<img border=\"0\" name=\"img".$sn."\"".      my $results_link = &results_link();
     " src=\"/adm/lonIcons/srvnull.gif\" alt=\"".$sk."\" /></a>'+\n";      my $result = <<"ENDFRAMES";
  $grid.="'<br />'+\n" unless $sn%10;  <html>
         $sn++;  <head>
     }  
     $r->print(<<ENDPOP);  
 <script>  <script>
     popwin=open('','popwin','scrollbars=1,width=400,height=200');  var targetwin = opener;
     popwin.focus();  var queue = '';
     popwin.document.writeln('<'+'html>');  
     popwin.document.writeln('<'+'head>');  
     popwin.document.writeln('<'+'script>');  
     popwin.document.writeln('hc=new Array();$hcinit');  
     popwin.document.writeln('<'+'/script>');  
     popwin.document.writeln('<'+'/head>'+  
         '<'+'body bgcolor="#FFFFFF">'+  
  '<'+'image align="right" src="/adm/lonIcons/'+  
  'lonanim.gif" '+  
  'alt="animated logo" />'+  
  '<'+'h3>Search Results Progress<'+'/h3>'+  
         '<'+'form name="popremain">'+  
         '<'+'tt>'+  
  '<'+'br clear="all"/><i>PLEASE BE PATIENT</i>'+  
  '<'+'br />SCANNING $servernum SERVERS'+  
  '<'+'br clear="all" />Number of record hits found '+  
  '<'+'input type="text" size="10" name="numhits"'+  
  ' value="0" />'+  
  '<'+'br clear="all" />Time elapsed '+  
  '<'+'input type="text" size="10" name="elapsetime"'+  
  ' value="0" />'+  
  '<'+'br />'+  
  'SERVER GRID (click on any cell for details)'+  
         $grid  
         '<'+'br />'+  
  'Server details '+  
  '<'+'input type="text" size="25" name="sdetails"'+  
  ' value="" />'+  
  '<'+'br />'+  
  '<'+'input type="button" name="button"'+  
  ' value="revise search" />'+  
  ' <'+'input type="button" name="button"'+  
  ' value="view results" />'+  
  ' <'+'input type="button" name="button"'+  
  ' value="help" />'+  
  '<'+'/tt>'+  
         '<'+'/form>'+  
         '<'+'/body><'+'/html>');  
     popwin.document.close();  
 </script>  </script>
 ENDPOP  <title>LON-CAPA Digital Library Search Results</title>
     $r->rflush();  </head>
   <frameset rows="150,*">
       <frame name="statusframe"  src="$run_search_link">
       <frame name="resultsframe" src="$results_link">
   </frameset>
   </html>
   ENDFRAMES
   
     my $servercount=0;      $r->print($result);
     $sn=0;      return;
     my $hitcountsum=0;  }
     foreach my $rkey (sort keys %rhash) {  
  $sn++;  
  $servercount++;  
  $tflag=1;  
  $compiledresult='';  
  my $hostname=$rkey;  
  my $reply=$rhash{$rkey};  
  my @results;  
   
  my $replyfile='';  
   
  if ($reply eq 'con_lost') {  
     $r->print('<script>popwin.document.img'.$sn.'.'.  
       'src="/adm/lonIcons/srvbad.gif";</script>'.  
       "\n");  
     $r->rflush();  
  }  
  else {  
     $reply=~/^([\.\w]+)$/; # must do since 'use strict' checks for tainting  
     $replyfile=$r->dir_config('lonDaemons').'/tmp/'.$1;  
     $reply=~/(.*?)\_/;  
     {  
  my $temp=0;  
       WLOOP: while (1) {  
   if (-e $replyfile && $tflag) {  
       $r->print('<script>popwin.document.img'.$sn.'.'.  
  'src="/adm/lonIcons/srvhalf.gif";</script>'.  
  "\n");  
       $r->rflush();  
       $r->print('<script>popwin.hc["'.$rkey.'"]='.  
  '"still transferring..."'.';</script>'.  
  "\n");  
       $r->rflush();  
       $tflag=0;  
   }  
   last WLOOP if $temp>5;  
   if (-e "$replyfile.end") {  
       if (-s $replyfile) {  
   $r->print('<script>popwin.document.img'.$sn.'.'.  
  'src="/adm/lonIcons/srvgood.gif";</script>'.  
  "\n");  
   $r->rflush();  
   my $fh=Apache::File->new($replyfile) or   
       ($r->print('ERROR: file '.  
  $replyfile.' cannot be opened') and  
        return OK);  
   @results=<$fh> if $fh;  
   $hitcount{$rkey}=@results+0;  
   $r->print('<script>popwin.hc["'.$rkey.'"]='.  
     $hitcount{$rkey}.';</script>'.  
     "\n");  
   $r->rflush();  
   $hitcountsum+=$hitcount{$rkey};  
   $r->print('<script>popwin.document.forms.popremain.'.  
     'numhits.value='.$hitcountsum.  
     ';</script>'.  
     "\n");  
   $r->rflush();  
       }  
       else {  
   $r->print('<script>popwin.document.img'.$sn.'.'.  
  'src="/adm/lonIcons/srvempty.gif";</script>'.  
  "\n");  
   $r->rflush();  
   $r->print('<script>popwin.hc["'.$rkey.'"]=0'.  
     ';</script>'.  
     "\n");  
   $r->rflush();  
       }  
       last WLOOP;  
   }  
   last WLOOP unless $timeremain;  
   sleep 1;  
   $timeremain--;  
   $elapsetime++;  
   $r->print('<script>popwin.document.popremain.elapsetime.'.  
     'value="'.$elapsetime.'";</script>'."\n");  
   $r->rflush();  
   $temp++;  
       }  
     }  
  }  
  my $customshow='';  
  my $extrashow='';  
  my @customfields;  
  if ($ENV{'form.customshow'}) {  
     $customshow=$ENV{'form.customshow'};  
     $customshow=~s/[^\w\s]//g;  
     my @fields=map {"<font color=\"#008000\">$_:</font><!-- $_ -->"}   
     split(/\s+/,$customshow);  
     @customfields=split(/\s+/,$customshow);  
     if ($customshow) {  
  $extrashow="<ul><li>".join("</li><li>",@fields)."</li></ul>\n";  
     }  
  }  
  my $customdata='';  
  my %customhash;  
  foreach my $result (@results) {  
     if ($result=~/^(custom\=.*)$/) { # grab all custom metadata  
  my $tmp=$result;  
  $tmp=~s/^custom\=//;  
  my ($k,$v)=map {&Apache::lonnet::unescape($_);  
     } split(/\,/,$tmp);  
  $customhash{$k}=$v;  
     }  
  }  
  foreach my $result (@results) {  
     next if $result=~/^custom\=/;  
     chomp $result;  
     next unless $result;  
     my @fields=map  
     {&Apache::lonnet::unescape($_)}  
     (split(/\,/,$result));  
     my ($title,$author,$subject,$url,$keywords,$version,  
  $notes,$abstract,$mime,$lang,  
  $creationdate,$lastrevisiondate,$owner,$copyright)=@fields;  
     my $shortabstract=$abstract;  
     $shortabstract=substr($abstract,0,200) if length($abstract)>200;  
     $fields[7]=$shortabstract;  
     my $extrashow2=$extrashow;  
     if ($extrashow) {  
  foreach my $field (@customfields) {  
     my $value='';  
     if ($customhash{$url}=~/\<${field}[^\>]*\>(.*?)\<\/${field}[^\>]*\>/s) {  
         $value=$1;  
     }  
             $extrashow2=~s/\<\!\-\- $field \-\-\>/ $value/g;  
         }  
             }  
   
             $compiledresult.=<<END if $compiledresult or $servercount!=$servernum;  
 <hr align='left' width='200' noshade />  
 END  
             $compiledresult.=<<END;  
 <p>  
 END  
             $compiledresult.=<<END if $ENV{'form.catalogmode'} eq 'interactive';  
 <font size='-1'><INPUT TYPE="button" NAME="returnvalues" VALUE="SELECT"  
 onClick="javascript:select_data('$title','$url')">  
 </font>  
 <br />  
 END  
             $compiledresult.=<<END if $ENV{'form.catalogmode'} eq 'groupsearch';  
 <font size='-1'><input type="checkbox" name="returnvalues" value="SELECT"  
 onClick="javascript:queue($fnum)" />  
 </font>  
 <input type="hidden" name="title$fnum" value="$title" />  
 <input type="hidden" name="url$fnum" value="$url" />  
 <br />  
 END  
             my $httphost=$ENV{'HTTP_HOST'};  
   
             my $viewselect;  ######################################################################
             if ($mode eq 'Basic') {  ######################################################################
  $viewselect=$ENV{'form.basicviewselect'};  
     }  
             elsif ($mode eq 'Advanced') {  
         $viewselect=$ENV{'form.advancedviewselect'};  
             }  
   
             if ($viewselect eq 'Detailed Citation View') {  =pod 
         $compiledresult.=&detailed_citation_view(@fields,  
  $hostname,$httphost,  
  $extrashow2);  
     }  
             elsif ($viewselect eq 'Summary View') {  
  $compiledresult.=&summary_view(@fields,$hostname,$httphost,  
        $extrashow2);  
     }  
             elsif ($viewselect eq 'Fielded Format') {  
  $compiledresult.=&fielded_format_view(@fields,$hostname,  
       $httphost,$extrashow2);  
     }  
             elsif ($viewselect eq 'XML/SGML') {  
  $compiledresult.=&xml_sgml_view(@fields,$hostname,$httphost,  
  $extrashow2);  
     }  
       
         }  
   
  if ($compiledresult) {  =item Metadata Viewing Functions
     $resultflag=1;  
  }  
   
  $r->print(<<RESULTS);  Output is a HTML-ified string.
 $compiledresult  
 RESULTS  Input arguments are title, author, subject, url, keywords, version,
         my $percent=sprintf('%3.0f',($servercount/$servernum*100));  notes, short abstract, mime, language, creation date,
   last revision date, owner, copyright, hostname, and
   extra custom metadata to show.
   
   =over 4
   
   =item &detailed_citation_view() 
   
   =cut
   
   ######################################################################
   ######################################################################
   sub detailed_citation_view {
       my ($prefix,%values) = @_;
       my $result;
       $result .= '<b>'.$prefix.
           '<img src="'.&Apache::loncommon::icon($values{'url'}).' " />'.'&nbsp;'.
           '<a href="http://'.$ENV{'HTTP_HOST'}.$values{'url'}.'" '.
           'target="search_preview">'.$values{'title'}."</a></b>\n";
       $result .= "<p>\n";
       $result .= '<b>'.$values{'author'}.'</b>,'.
           ' <i>'.$values{'owner'}.'</i><br />';
       foreach my $field 
           (
            { name=>'url',
              translate => '<b>URL:</b>&nbsp;[_1]',
              special => 'url link',},
            { name=>'subject',
              translate => '<b>Subject:</b>&nbsp;[_1]',},
            { name=>'keywords',
              translate => '<b>Keywords:</b>&nbsp;[_1]',},
            { name=>'notes',
              translate => '<b>Notes:</b>&nbsp;[_1]',},
            { name=>'mimetag',
              translate => '<b>MIME Type:</b>&nbsp;[_1]',},
            { name=>'standards',
              translate => '<b>Standards:</b>[_1]',},
            { name=>'copyrighttag',
              translate => '<b>Copyright/Distribution:</b>&nbsp;[_1]',},
            { name=>'count',
              translate => '<b>Access Count:</b>&nbsp;[_1]',},
            { name=>'stdno',
              translate => '<b>Number of Students:</b>&nbsp;[_1]',},
            { name=>'avetries',
              translate => '<b>Average Tries:</b>&nbsp;[_1]',},
            { name=>'disc',
              translate => '<b>Degree of Discrimination:</b>&nbsp;[_1]',},
            { name=>'difficulty',
              translate => '<b>Degree of Difficulty:</b>&nbsp;[_1]',},
            { name=>'clear',
              translate => '<b>Clear:</b>&nbsp;[_1]',},
            { name=>'depth',
              translate => '<b>Depth:</b>&nbsp;[_1]',},
            { name=>'helpful',
              translate => '<b>Helpful:</b>&nbsp;[_1]',},
            { name=>'correct',
              translate => '<b>Correcy:</b>&nbsp;[_1]',},
            { name=>'technical',
              translate => '<b>Technical:</b>&nbsp;[_1]',},
            ) {
           if (exists($values{$field->{'name'}}) &&
               $values{$field->{'name'}} ne '') {
               if ($field->{'special'} eq 'url link') {
                   $result.= 
                       &mt($field->{'translate'},
                           '<a href="'.$values{'url'}.'" '.
                               'target="search_preview">'.
                           $values{$field->{'name'}}.
                           '</a>');
               } else {
                   $result.= &mt($field->{'translate'},
                                 $values{$field->{'name'}});
               }
               $result .= "<br />\n";
               }
     }      }
     unless ($resultflag) {      $result .= "</p>";
         $r->print("\nThere were no results that matched your query\n");      if (exists($values{'extrashow'}) && $values{'extrashow'} ne '') {
           $result .= '<p>'.$values{'extrashow'}.'</p>';
     }      }
 #    $r->print('<script>popwin.close()</script>'."\n"); $r->rflush();       if (exists($values{'shortabstract'}) && $values{'shortabstract'} ne '') {
     $r->print(<<RESULTS);          $result .= '<p>'.$values{'shortabstract'}.'</p>';
 </body>      }
 </html>      $result .= '<hr align="left" width="200" noshade />'."\n";
 RESULTS      return $result;
 }  }
   
 # ------------------------------------------------------ Detailed Citation View  ######################################################################
 sub detailed_citation_view {  ######################################################################
     my ($title,$author,$subject,$url,$keywords,$version,  
  $notes,$shortabstract,$mime,$lang,  sub has_stat_data {
  $creationdate,$lastrevisiondate,$owner,$copyright,      my ($values) = @_;
  $hostname,$httphost,$extrashow)=@_;      if ( (defined($values->{'count'})      && $values->{'count'}      ne '') ||
     my $result=<<END;           (defined($values->{'stdno'})      && $values->{'stdno'}      ne '') ||
 <i>$owner</i>, last revised $lastrevisiondate           (defined($values->{'disc'})       && $values->{'disc'}       ne '') ||
 <h3><A HREF="http://$httphost$url" TARGET='search_preview'>$title</A></h3>           (defined($values->{'avetries'})   && $values->{'avetries'}   ne '') ||
 <h3>$author</h3>           (defined($values->{'difficulty'}) && $values->{'difficulty'} ne '')) {
 </p>          return 1;
 <p>      }
 <b>Subject:</b> $subject<br />      return 0;
 <b>Keyword(s):</b> $keywords<br />  
 <b>Notes:</b> $notes<br />  
 <b>MIME Type:</b> $mimetag{$mime}<br />  
 <b>Language:</b> $language{$lang}<br />  
 <b>Copyright/Distribution:</b> $cprtag{$copyright}<br />  
 </p>  
 $extrashow  
 <p>  
 $shortabstract  
 </p>  
 END  
     return $result;  
 }  }
   
 # ---------------------------------------------------------------- Summary View  sub statfields {
       return ('count','stdno','disc','avetries','difficulty');
   }
   
   sub has_eval_data {
       my ($values) = @_;
       if ( (defined($values->{'clear'})     && $values->{'clear'}     ne '') ||
            (defined($values->{'technical'}) && $values->{'technical'} ne '') ||
            (defined($values->{'correct'})   && $values->{'correct'}   ne '') ||
            (defined($values->{'helpful'})   && $values->{'helpful'}   ne '') ||
            (defined($values->{'depth'})     && $values->{'depth'}     ne '')) {
           return 1;
       }
       return 0;
   }
   
   sub evalfields { 
       return ('clear','technical','correct','helpful','depth');
   }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &summary_view() 
   
   =cut
   ######################################################################
   ######################################################################
 sub summary_view {  sub summary_view {
     my ($title,$author,$subject,$url,$keywords,$version,      my ($prefix,%values) = @_;
  $notes,$shortabstract,$mime,$lang,      my $icon=&Apache::loncommon::icon($values{'url'});
  $creationdate,$lastrevisiondate,$owner,$copyright,  
  $hostname,$httphost,$extrashow)=@_;  
     my $result=<<END;      my $result=<<END;
 <a href="http://$httphost$url" TARGET='search_preview'>$author</a><br />  $prefix<img src="$icon" />&nbsp;
 $title<br />  <a href="http://$ENV{'HTTP_HOST'}$values{'url'}" 
 $owner -- $lastrevisiondate<br />     target='search_preview'>$values{'author'}</a><br />
 $cprtag{$copyright}<br />  $values{'title'}<br />
 $extrashow  $values{'owner'} -- $values{'lastrevisiondate'}<br />
   $values{'copyrighttag'}<br />
   $values{'extrashow'}
 </p>  </p>
   <hr align='left' width='200' noshade />
 END  END
     return $result;      return $result;
 }  }
   
 # -------------------------------------------------------------- Fielded Format  ######################################################################
   ######################################################################
   
   =pod 
   
   =item &compact_view() 
   
   =cut
   
   ######################################################################
   ######################################################################
   sub compact_view {
       my ($prefix,%values) = @_;
       my $result = 
           $prefix.'<img src="'.&Apache::loncommon::icon($values{'url'}).
           '">&nbsp;<a href="'.$values{'url'}.'" target="search_preview">'.
           $values{'title'}.'</a>'.('&nbsp;'x2).
           '<b>'.$values{'author'}.'</b><br />';
       return $result;
   }
   
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &fielded_format_view() 
   
   =cut
   
   ######################################################################
   ######################################################################
 sub fielded_format_view {  sub fielded_format_view {
     my ($title,$author,$subject,$url,$keywords,$version,      my ($prefix,%values) = @_;
  $notes,$shortabstract,$mime,$lang,      my $icon=&Apache::loncommon::icon($values{'url'});
  $creationdate,$lastrevisiondate,$owner,$copyright,      my %Translated = &Apache::lonmeta::fieldnames();
  $hostname,$httphost,$extrashow)=@_;  
     my $result=<<END;      my $result=<<END;
 <b>URL: </b> <A HREF="http://$httphost$url" TARGET='search_preview'>$url</A>  $prefix <img src="$icon" />
 <br />  <dl>
 <b>Title:</b> $title<br />  <dt>URL:</dt>
 <b>Author(s):</b> $author<br />      <dd><a href="http://$ENV{'HTTP_HOST'}$values{'url'}" 
 <b>Subject:</b> $subject<br />           target='search_preview'>$values{'url'}</a></dd>
 <b>Keyword(s):</b> $keywords<br />  
 <b>Notes:</b> $notes<br />  
 <b>MIME Type:</b> $mimetag{$mime}<br />  
 <b>Language:</b> $language{$lang}<br />  
 <b>Creation Date:</b> $creationdate<br />  
 <b>Last Revision Date:</b> $lastrevisiondate<br />  
 <b>Publisher/Owner:</b> $owner<br />  
 <b>Copyright/Distribution:</b> $cprtag{$copyright}<br />  
 <b>Repository Location:</b> $hostname<br />  
 <b>Abstract:</b> $shortabstract<br />  
 $extrashow  
 </p>  
 END  END
       foreach my $field ('title','author','subject','keywords','notes',
                          'mimetag','language','creationdate','lastrevisiondate',
                          'owner','copyrighttag','hostname','abstract') {
           $result .= (' 'x4).'<dt>'.$Translated{$field}.'</dt>'."\n".
               (' 'x8).'<dd>'.$values{$field}.'</dd>'."\n";
       }
       if (&has_stat_data(\%values)) {
           foreach my $field (&statfields()) {
               $result .= (' 'x4).'<dt>'.$Translated{$field}.'</dt>'."\n".
                   (' 'x8).'<dd>'.$values{$field}.'</dd>'."\n";
           }
       }
       if (&has_eval_data(\%values)) {
           foreach my $field (&evalfields()) {
               $result .= (' 'x4).'<dt>'.$Translated{$field}.'</dt>'."\n".
                   (' 'x8).'<dd>'.$values{$field}.'</dd>'."\n";
           }
       }
       $result .= "</dl>\n";
       $result .= $values{'extrashow'};
       $result .= '<hr align="left" width="200" noshade />'."\n";
     return $result;      return $result;
 }  }
   
 # -------------------------------------------------------------------- XML/SGML  ######################################################################
   ######################################################################
   
   =pod 
   
   =item &xml_sgml_view() 
   
   =back 
   
   =cut
   
   ######################################################################
   ######################################################################
 sub xml_sgml_view {  sub xml_sgml_view {
     my ($title,$author,$subject,$url,$keywords,$version,      my ($prefix,%values) = @_;
  $notes,$shortabstract,$mime,$lang,      my $xml = '<LonCapaResource>'."\n";
  $creationdate,$lastrevisiondate,$owner,$copyright,      # The usual suspects
  $hostname,$httphost,$extrashow)=@_;      foreach my $field ('url','title','author','subject','keywords','notes') {
           $xml .= qq{<$field>$values{$field}</$field>}."\n";
       }
       #
       $xml .= "<mimeInfo>\n";
       foreach my $field ('mime','mimetag') {
           $xml .= qq{<$field>$values{$field}</$field>}."\n";
       }
       $xml .= "</mimeInfo>\n";
       #
       $xml .= "<languageInfo>\n";
       foreach my $field ('language','languagetag') {
           $xml .= qq{<$field>$values{$field}</$field>}."\n";
       }
       $xml .= "</languageInfo>\n";
       #
       foreach my $field ('creationdate','lastrevisiondate','owner') {
           $xml .= qq{<$field>$values{$field}</$field>}."\n";
       }
       #
       $xml .= "<copyrightInfo>\n";
       foreach my $field ('copyright','copyrighttag') {
           $xml .= qq{<$field>$values{$field}</$field>}."\n";
       }
       $xml .= "</copyrightInfo>\n";
       $xml .= qq{<repositoryLocation>$values{'hostname'}</repositoryLocation>}.
           "\n";
       $xml .= qq{<shortabstract>$values{'shortabstract'}</shortabstract>}."\n";
       #
       if (&has_stat_data(\%values)){
           $xml .= "<problemstatistics>\n";
           foreach my $field (&statfields()) {
               $xml .= qq{<$field>$values{$field}</$field>}."\n";            
           }
           $xml .= "</problemstatistics>\n";
       }
       #
       if (&has_eval_data(\%values)) {
           $xml .= "<evaluation>\n";
           foreach my $field (&evalfields) {
               $xml .= qq{<$field>$values{$field}</$field>}."\n";            
           }
           $xml .= "</evaluation>\n";
       }    
       #
       $xml .= "</LonCapaResource>\n";
       $xml = &HTML::Entities::encode($xml,'<>&');
     my $result=<<END;      my $result=<<END;
   $prefix
 <pre>  <pre>
 &lt;LonCapaResource&gt;  $xml
 &lt;url&gt;$url&lt;/url&gt;  
 &lt;title&gt;$title&lt;/title&gt;  
 &lt;author&gt;$author&lt;/author&gt;  
 &lt;subject&gt;$subject&lt;/subject&gt;  
 &lt;keywords&gt;$keywords&lt;/keywords&gt;  
 &lt;notes&gt;$notes&lt;/notes&gt;  
 &lt;mimeInfo&gt;  
 &lt;mime&gt;$mime&lt;/mime&gt;  
 &lt;mimetag&gt;$mimetag{$mime}&lt;/mimetag&gt;  
 &lt;/mimeInfo&gt;  
 &lt;languageInfo&gt;  
 &lt;language&gt;$lang&lt;/language&gt;  
 &lt;languagetag&gt;$language{$lang}&lt;/languagetag&gt;  
 &lt;/languageInfo&gt;  
 &lt;creationdate&gt;$creationdate&lt;/creationdate&gt;  
 &lt;lastrevisiondate&gt;$lastrevisiondate&lt;/lastrevisiondate&gt;  
 &lt;owner&gt;$owner&lt;/owner&gt;  
 &lt;copyrightInfo&gt;  
 &lt;copyright&gt;$copyright&lt;/copyright&gt;  
 &lt;copyrighttag&gt;$cprtag{$copyright}&lt;/copyrighttag&gt;  
 &lt;/copyrightInfo&gt;  
 &lt;repositoryLocation&gt;$hostname&lt;/repositoryLocation&gt;  
 &lt;shortabstract&gt;$shortabstract&lt;/shortabstract&gt;  
 &lt;/LonCapaResource&gt;  
 </pre>  </pre>
 $extrashow  $values{'extrashow'}
   <hr align='left' width='200' noshade />
 END  END
     return $result;      return $result;
 }  }
   
 # ---------------------------------------------------- see if a field is filled  ######################################################################
   ######################################################################
   
   =pod 
   
   =item &filled() see if field is filled.
   
   =cut
   
   ######################################################################
   ######################################################################
 sub filled {  sub filled {
     my ($field)=@_;      my ($field)=@_;
     if ($field=~/\S/ && $field ne 'any') {      if ($field=~/\S/ && $field ne 'any') {
  return 1;          return 1;
     }      } else {
     else {          return 0;
  return 0;  
     }      }
 }  }
   
 # ---------------- Message to output when there are not enough fields filled in  ######################################################################
   ######################################################################
   
   =pod 
   
   =item &output_blank_field_error()
   
   Output a complete page that indicates the user has not filled in enough
   information to do a search.
   
   Inputs: $r (Apache request handle), $closebutton, $parms.
   
   Returns: nothing
   
   $parms is extra information to include in the 'Revise search request' link.
   
   =cut
   
   ######################################################################
   ######################################################################
 sub output_blank_field_error {  sub output_blank_field_error {
     my ($r)=@_;      my ($r,$closebutton,$parms,$hidden_fields)=@_;
       my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
     # make query information persistent to allow for subsequent revision      # make query information persistent to allow for subsequent revision
     my $persistent=&make_persistent();  
   
     $r->print(<<BEGINNING);      $r->print(<<BEGINNING);
 <html>  <html>
 <head>  <head>
Line 1402  sub output_blank_field_error { Line 3161  sub output_blank_field_error {
 BEGINNING  BEGINNING
     $r->print(<<RESULTS);      $r->print(<<RESULTS);
 </head>  </head>
 <body bgcolor="#ffffff">  $bodytag
 <img align='right' src='/adm/lonIcons/lonlogos.gif' />  <img align='right' src='/adm/lonIcons/lonlogos.gif' />
 <h1>Search Catalog</h1>  <h1>Search Catalog</h1>
 <form method="post" action="/adm/searchcat">  <form method="post" action="/adm/searchcat">
 $persistent  $hidden_fields
 <input type='button' value='Revise search request'  <a href="/adm/searchcat?$parms&persistent_db_id=$ENV{'form.persistent_db_id'}"
 onClick='this.form.submit();' />  >Revise search request</a>&nbsp;
 $closebutton  $closebutton
 <hr />  <hr />
 <h3>Helpful Message</h3>  <h3>Unactionable search query.</h3>
 <p>  <p>
 Incorrect search query due to blank entry fields.  You did not fill in enough information for the search to be started.
 You need to fill in the relevant  You need to fill in relevant fields on the search page in order 
 fields on the search page in order for a query to be  for a query to be processed.
 processed.  
 </p>  </p>
 </body>  </body>
 </html>  </html>
 RESULTS  RESULTS
 }  }
   
 # ----------------------------------------------------------- Output date error  ######################################################################
   ######################################################################
   
   =pod 
   
   =item &output_date_error()
   
   Output a full html page with an error message.
   
   Inputs: 
   
       $r, the request pointer.
       $message, the error message for the user.
       $closebutton, the specialized close button needed for groupsearch.
   
   =cut
   
   ######################################################################
   ######################################################################
 sub output_date_error {  sub output_date_error {
     my ($r,$message)=@_;      my ($r,$message,$closebutton,$hidden_fields)=@_;
     # make query information persistent to allow for subsequent revision      # make query information persistent to allow for subsequent revision
     my $persistent=&make_persistent();      my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
       $r->print(<<RESULTS);
     $r->print(<<BEGINNING);  
 <html>  <html>
 <head>  <head>
 <title>The LearningOnline Network with CAPA</title>  <title>The LearningOnline Network with CAPA</title>
 BEGINNING  
     $r->print(<<RESULTS);  
 </head>  </head>
 <body bgcolor="#ffffff">  $bodytag
 <img align='right' src='/adm/lonIcons/lonlogos.gif' />  <img align='right' src='/adm/lonIcons/lonlogos.gif' />
 <h1>Search Catalog</h1>  <h1>Search Catalog</h1>
 <form method="post" action="/adm/searchcat">  <form method="post" action="/adm/searchcat">
 $persistent  $hidden_fields
 <input type='button' value='Revise search request'  <input type='button' value='Revise search request'
 onClick='this.form.submit();' />  onClick='this.form.submit();' />
 $closebutton  $closebutton
 <hr />  <hr />
 <h3>Helpful Message</h3>  <h3>Error</h3>
 <p>  <p>
 $message  $message
 </p>  </p>
Line 1454  $message Line 3227  $message
 RESULTS  RESULTS
 }  }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &start_fresh_session()
   
   Cleans the global %groupsearch_db by removing all fields which begin with
   'pre_' or 'store'.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub start_fresh_session {
       delete $groupsearch_db{'mode_catalog'};
       foreach (keys %groupsearch_db) {
           if ($_ =~ /^pre_/) {
               delete $groupsearch_db{$_};
           }
           if ($_ =~ /^store/) {
       delete $groupsearch_db{$_};
    }
       }
   }
   
 1;  1;
   
   sub cleanup {
       if (tied(%groupsearch_db)) {
           unless (untie(%groupsearch_db)) {
     &Apache::lonnet::logthis('Failed cleanup searchcat: groupsearch_db');
           }
       }
       &untiehash();
       &Apache::lonmysql::disconnect_from_db();
   }
   
 __END__  __END__
   
   =pod
   
   =back 
   
   =cut
Removed from v.1.99  
changed lines
  Added in v.1.223

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