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Diff for /loncom/interface/lonsearchcat.pm between versions 1.62 and 1.143

version 1.62, 2001/03/21 12:51:15 version 1.143, 2002/07/16 15:02:06
Line 1 Line 1
 # The LearningOnline Network  # The LearningOnline Network with CAPA
 # Search Catalog  # Search Catalog
 #  #
 # 03/08/2001 Scott Harrison  # $Id$
 # Scott Harrison: 03/12/2001, 03/13/2001, 03/14/2001, 03/15/2001, 03/19/2001  
 # Scott Harrison: 03/20/2001  
 #  #
 # Functions  # Copyright Michigan State University Board of Trustees
 #  #
 # handler(server reference) : interacts with the Apache server layer  # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
 #                             (for /adm/searchcat URLs)  #
 # simpletextfield(name,value) : returns HTML formatted string for simple text  # LON-CAPA is free software; you can redistribute it and/or modify
 #                               field  # it under the terms of the GNU General Public License as published by
 # simplecheckbox(name,value) : returns HTML formatted string for simple  # the Free Software Foundation; either version 2 of the License, or
 #                              checkbox  # (at your option) any later version.
 # searchphrasefield(title,name,value) : returns HTML formatted string for  #
 #                                       a search expression phrase field  # LON-CAPA is distributed in the hope that it will be useful,
 # dateboxes(name, defaultmonth, defaultday, defaultyear) : returns HTML  # but WITHOUT ANY WARRANTY; without even the implied warranty of
 #                                                          formatted string  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 #                                                          for a calendar date  # GNU General Public License for more details.
 # selectbox(title,name,value,%HASH=options) : returns HTML formatted string for  #
 #                                             a selection box field  # You should have received a copy of the GNU General Public License
 # advancedsearch(server reference, environment reference) : perform a complex  # along with LON-CAPA; if not, write to the Free Software
 #                                  multi-field logical query  # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 # filled(field) : determines whether a given field has been filled  #
 # basicsearch(server reference, environment reference) : perform a simple  # /home/httpd/html/adm/gpl.txt
 #                               single-field logical query  #
 # output_blank_field_error(server reference) : outputs a message saying that  # http://www.lon-capa.org/
 #                                              more fields need to be filled in  #
 # output_results(output mode,  # YEAR=2001
 #                server reference,   # 3/8, 3/12, 3/13, 3/14, 3/15, 3/19 Scott Harrison
 #                environment reference,  # 3/20, 3/21, 3/22, 3/26, 3/27, 4/2, 8/15, 8/24, 8/25 Scott Harrison
 #                reply list reference) : outputs results from search  # 10/12,10/14,10/15,10/16,11/28,11/29,12/10,12/12,12/16 Scott Harrison
 # build_SQL_query(field name, logic) : builds a SQL query string from a  # YEAR=2002
 #                                      logical expression with AND/OR keywords  # 1/17 Scott Harrison
 # recursive_SQL_query_build(field name, reverse notation expression) :   # 6/17 Matthew Hall
 #                 builds a SQL query string from a reverse notation expression  #
 #                 logical expression with AND/OR keywords  ###############################################################################
   ###############################################################################
   
   =pod 
   
   =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 seperate window.
   
   =head1 Internals
   
   =over 4
   
   =cut
   
   ###############################################################################
   ###############################################################################
   
   ###############################################################################
   ##                                                                           ##
   ## ORGANIZATION OF THIS PERL MODULE                                          ##
   ##                                                                           ##
   ## 1. Modules used by this module                                            ##
   ## 2. Variables used throughout the module                                   ##
   ## 3. handler subroutine called via Apache and mod_perl                      ##
   ## 4. Other subroutines                                                      ##
   ##                                                                           ##
   ###############################################################################
   
 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);
 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();
   
 my %language;  # ---------------------------------------- variables used throughout the module
 my $scrout;  
 my %metadatafields;  
 my %cprtag;  
 my %mimetag;  
 my $closebutton;  
 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  
   
 sub handler {  ######################################################################
     my $r = shift;  ######################################################################
   
 # -------------------------------------- see if called from an interactive mode  =pod 
     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'}));  
   
     $r->content_type('text/html');  =item Global variables
     $r->send_http_header;  
     return OK if $r->header_only;  
   
     %metadatafields=();  =over 4
   
     my $hidden='';  =item $closebutton
     $hidden=<<END if $ENV{'form.catalogmode'} eq 'interactive';  
 <input type='hidden' name='catalogmode' value='interactive'>  
 END  
   
     $closebutton=<<END if $ENV{'form.catalogmode'} eq 'interactive';  button that closes the search window
 <input type="button" name="close" value="CLOSE" onClick="self.close()">  
 END  
   
 # ------------------------------------------------ First, check out environment  =item $importbutton
     $metadatafields{'owner'}=$ENV{'user.name'}.'@'.$ENV{'user.domain'};  
   
 # --------------------------------- Compute various listings of metadata values  button to take the select results and go to group sorting
       
     %language=();  
     $language{'any'}='Any language';  
     {  
  my $fh=Apache::File->new($r->dir_config('lonTabDir').'/language.tab');  
  map {  
     $_=~/(\w+)\s+([\w\s\-]+)/; chomp;  
     $language{$1}=$2;  
  } <$fh>;  
     }  
   
     %cprtag=();  =item %groupsearch_db   
     $cprtag{'any'}='Any copyright/distribution';  
     {  
  my $fh=Apache::File->new($r->dir_config('lonIncludes').'/copyright.tab');  
  map {  
     $_=~/(\w+)\s+([\w\s\-]+)/; chomp;  
     $cprtag{$1}=$2;  
  } <$fh>;  
     }  
   
     %mimetag=();  Database hash used to save values for the groupsearch RAT interface.
     $mimetag{'any'}='Any type';  
     {  =item $diropendb 
  my $fh=Apache::File->new($r->dir_config('lonTabDir').'/filetypes.tab');  
  map {  The full path to the (temporary) search database file.  This is set and
     $_=~/(\w+)\s+(\w+)\s+([\w\s\-]+)/; chomp;  used in &handler() and is also used in &output_results().
     $mimetag{$1}=".$1 $3";  
  } <$fh>;  =item %Views
     }  
   Hash which associates an output view description with the function
   that produces it.  Adding a new view type should be as easy as
   adding a line to the definition of this hash and making sure the function
   takes the proper parameters.
   
   =item $results_db
   
   The name of the database results from searches are put in.
   
   =back 
   
   =cut
   
   ######################################################################
   ######################################################################
   
   # -- 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 %groupsearch_db;     # database hash
   my $diropendb = "";    # db file
   
   my $results_db = "";
   #             View Description           Function Pointer
   my %Views = ("Detailed Citation View" => \&detailed_citation_view,
                "Summary View"           => \&summary_view,
                "Fielded Format"         => \&fielded_format_view,
                "XML/SGML"               => \&xml_sgml_view );
   
   ######################################################################
   ######################################################################
   
   =pod 
   
     if ($ENV{'form.basicsubmit'} eq 'SEARCH') {  =item &handler() - main handler invoked by httpd child
  return &basicsearch($r,\%ENV);  
   =item Variables
   
   =over 4
   
   =item $hidden
   
   holds 'hidden' html forms
   
   =item $scrout
   
   string that holds portions of the screen output
   
   =back 
   
   =cut
   
   ######################################################################
   ######################################################################
   sub handler {
       my $r = shift;
       untie %groupsearch_db;
   
       $r->content_type('text/html');
       $r->send_http_header;
       return OK if $r->header_only;
       ##
       ## Initialize global variables
       ##
       my $domain  = $r->dir_config('lonDefDomain');
       $diropendb= "/home/httpd/perl/tmp/".&Apache::lonnet::escape($domain).
               "\_".&Apache::lonnet::escape($ENV{'user.name'})."_searchcat.db";
       $results_db = "/home/httpd/perl/tmp/".&Apache::lonnet::escape($domain).
           '_'.&Apache::lonnet::escape($ENV{'user.name'})."_searchresults.db";
       &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
                ['catalogmode','launch','acts','mode','form','element',
                 'reqinterface']);
       ##
       ## Clear out old values from groupsearch database
       ##
       if ($ENV{'form.launch'} eq '1') {
    if (tie(%groupsearch_db,'GDBM_File',$diropendb,&GDBM_WRCREAT,0640)) {
       &start_fresh_session();
       untie %groupsearch_db;
    } else {
       $r->print('<html><head></head><body>Unable to tie hash to db '.
         'file</body></html>');
       return OK;
    }
     }      }
     elsif ($ENV{'form.advancedsubmit'} eq 'SEARCH') {      ##
  return &advancedsearch($r,\%ENV);      ## Produce some output, so people know it is working
       ##
       $r->print("\n");
       $r->rflush;
       ##
       ## Configure dynamic components of interface
       ##
       my $hidden;       # Holds 'hidden' html forms
       if ($ENV{'form.catalogmode'} eq 'interactive') {
    $hidden="<input type='hidden' name='catalogmode' value='interactive'>".
       "\n";
           $closebutton="<input type='button' name='close' value='CLOSE' ".
       "onClick='self.close()'>"."\n";
       } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {
    $hidden=<<END;
   <input type='hidden' name='catalogmode' value='groupsearch'>
   END
           $closebutton=<<END;
   <input type='button' name='close' value='CLOSE' onClick='self.close()'>
   END
           $importbutton=<<END;
   <input type='button' name='import' value='IMPORT'
   onClick='javascript:select_group()'>
   END
       }
       $hidden .= &make_persistent({ "form.mode"    => $ENV{'form.mode'},
                                     "form.form"    => $ENV{'form.form'},
                                     "form.element" => $ENV{'form.element'},
                                     "form.date"    => 2 });
       ##
       ##  What are we doing?
       ##
       my $searchtype;
       $searchtype = 'Basic'    if ($ENV{'form.basicsubmit'}    eq 'SEARCH');
       $searchtype = 'Advanced' if ($ENV{'form.advancedsubmit'} eq 'SEARCH');
       if ($searchtype) {
           # We are running a search
           my ($query,$customquery,$customshow,$libraries) = 
               (undef,undef,undef,undef);
           my $pretty_string;
           if ($searchtype eq 'Basic') {
               ($query,$pretty_string) = &parse_basic_search($r);
           } elsif ($ENV{'form.advancedsubmit'} eq 'SEARCH') {
               ($query,$customquery,$customshow,$libraries,$pretty_string) 
                   = &parse_advanced_search($r);
               return OK if (! defined($query));
           }
           # Output some information to the user.
           $r->print(&search_results_header($searchtype,$pretty_string));
           $r->print("Sending search request to LON-CAPA servers.<br />\n");
           $r->rflush();
           # Send query statements over the network to be processed by 
           # either the SQL database or a recursive scheme of 'grep'-like 
           # actions (for custom metadata).
           my $reply=&Apache::lonnet::metadata_query($query,$customquery,
                                                  $customshow,$libraries);
           $r->rflush();
           &output_results($searchtype,$r,$reply,$hidden);
       } else {
           #
           # We need to get information to search on
           #
           # Set the default view if it is not already set.
           if (!defined($ENV{'form.viewselect'})) {
               $ENV{'form.viewselect'} ="Detailed Citation View";
           }
           # Output the advanced interface
           if ($ENV{'form.reqinterface'} eq 'advanced') {
               $r->print(&advanced_search_form($closebutton,$hidden));
           } else { 
               # Output normal search interface
               $r->print(&basic_search_form($closebutton,$hidden));
           }
     }      }
       return OK;
   } 
   
   ######################################################################
   ######################################################################
   
     $scrout=''; # building a part of screen output  =pod 
     $scrout.=&searchphrasefield('Limit by title','title',  
  $ENV{'form.title'});  
   
     $scrout.=&searchphrasefield('Limit by author','author',  =item &basic_search_form() 
  $ENV{'form.author'});  
   
     $scrout.=&searchphrasefield('Limit by subject','subject',  Returns a scalar which holds html for the basic search form.
  $ENV{'form.subject'});  
   
     $scrout.=&searchphrasefield('Limit by keywords','keywords',  =cut
  $ENV{'form.keywords'});  
   ######################################################################
   ######################################################################
   
   sub basic_search_form{
       my ($closebutton,$hidden) = @_;
       my $scrout=<<"ENDDOCUMENT";
   <html>
   <head>
   <title>The LearningOnline Network with CAPA</title>
   <script type="text/javascript">
       function openhelp(val) {
    openhelpwin=open('/adm/help/searchcat.html','helpscreen',
        'scrollbars=1,width=600,height=300');
    openhelpwin.focus();
       }
   </script>
   </head>
   <body bgcolor="#FFFFFF">
   <img align='right' src='/adm/lonIcons/lonlogos.gif' />
   <h1>Search Catalog</h1>
   <form method="post" action="/adm/searchcat">
   $hidden
   <h3>Basic Search</h3>
   <p>
   Enter terms or phrases separated by AND, OR, or NOT 
   then press SEARCH below.
   </p>
   <p>
   <table>
   <tr><td>
   ENDDOCUMENT
       $scrout.='&nbsp;'.&simpletextfield('basicexp',$ENV{'form.basicexp'},40).
           '&nbsp;';
   #    $scrout.=&simplecheckbox('allversions',$ENV{'form.allversions'});
   #    $scrout.='<font color="#800000">Search historic archives</font>';
       my $checkbox = &simplecheckbox('related',$ENV{'form.related'});
       $scrout.=<<END;
   </td><td><a href="/adm/searchcat?reqinterface=advanced">Advanced Search</a></td></tr>
   <tr><td>$checkbox use related words</td><td></td></tr>
   </table>
   </p>
   <p>
   &nbsp;<input type="submit" name="basicsubmit" value='SEARCH' />&nbsp;
   $closebutton
   END
       $scrout.=&selectbox(undef,'viewselect',
    $ENV{'form.viewselect'},
    undef,undef,undef,
    sort(keys(%Views)));
       $scrout.=<<ENDDOCUMENT;
   <input type="button" value="HELP" onClick="openhelp()" />
   </p>
   </form>
   </body>
   </html>
   ENDDOCUMENT
       return $scrout;
   }
   ######################################################################
   ######################################################################
   
     $scrout.=&searchphrasefield('Limit by URL','url',  =pod 
  $ENV{'form.url'});  
   
     $scrout.=&searchphrasefield('Limit by version','version',  =item &advanced_search_form() 
  $ENV{'form.version'});  
   
     $scrout.=&searchphrasefield('Limit by notes','notes',  Returns a scalar which holds html for the advanced search form.
  $ENV{'form.notes'});  
   
     $scrout.=&searchphrasefield('Limit by abstract','abstract',  =cut
  $ENV{'form.abstract'});  
   
     $ENV{'form.mime'}='notxxx' unless length($ENV{'form.mime'});  ######################################################################
     $scrout.=&selectbox('Limit by MIME type','mime',  ######################################################################
  $ENV{'form.mime'},%mimetag);  
   
   sub advanced_search_form{
       my ($closebutton,$hidden) = @_;
       my $advanced_buttons = <<"END";
   <p>
   <input type="submit" name="advancedsubmit" value='SEARCH' />
   <input type="reset" name="reset" value='RESET' />
   $closebutton
   <input type="button" value="HELP" onClick="openhelp()" />
   </p>
   END
       if (!defined($ENV{'form.viewselect'})) {
           $ENV{'form.viewselect'} ="Detailed Citation View";
       }
       my $scrout=<<"ENDHEADER";
   <html>
   <head>
   <title>The LearningOnline Network with CAPA</title>
   <script type="text/javascript">
       function openhelp(val) {
    openhelpwin=open('/adm/help/searchcat.html','helpscreen',
        'scrollbars=1,width=600,height=300');
    openhelpwin.focus();
       }
   </script>
   </head>
   <body bgcolor="#FFFFFF">
   <img align='right' src='/adm/lonIcons/lonlogos.gif' />
   <h1>Advanced Catalog Search</h1>
   <hr />
   Enter terms or phrases separated by search operators 
   such as AND, OR, or NOT.<br />
   <form method="post" action="/adm/searchcat">
   $advanced_buttons
   $hidden
   <table>
   <tr><td><font color="#800000" face="helvetica"><b>VIEW:</b></font></td>
   <td>
   ENDHEADER
       $scrout.=&selectbox(undef,'viewselect',
    $ENV{'form.viewselect'},
    undef,undef,undef,
    sort(keys(%Views)));
       $scrout.="</td><td>Related<br />Words</td></tr>\n";
       $scrout.=&searchphrasefield_with_related('title',   'title'   ,
                                                $ENV{'form.title'});
       $scrout.=&searchphrasefield('author',  'author'  ,$ENV{'form.author'});
       $scrout.=&searchphrasefield_with_related('subject', 'subject' ,
                                                $ENV{'form.subject'});
       $scrout.=&searchphrasefield_with_related('keywords','keywords',
                                                $ENV{'form.keywords'});
       $scrout.=&searchphrasefield('URL',     'url'     ,$ENV{'form.url'});
       $scrout.=&searchphrasefield_with_related('notes',   'notes'   ,
                                                $ENV{'form.notes'});
       $scrout.=&searchphrasefield_with_related('abstract','abstract',
                                                $ENV{'form.abstract'});
       # Hack - an empty table row.
       $scrout.="<tr><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>\n";
       $scrout.=&searchphrasefield('file<br />extension','mime',
                           $ENV{'form.mime'});
       $scrout.="<tr><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td></tr>\n";
       $scrout.=&searchphrasefield('publisher<br />owner','owner',
    $ENV{'form.owner'});
       $scrout.="</table>\n";
       $ENV{'form.category'}='any' unless length($ENV{'form.category'});
       $scrout.=&selectbox('File Category','category',
    $ENV{'form.category'},
    'any','Any category',
    undef,
    (&Apache::loncommon::filecategories()));
     $ENV{'form.language'}='any' unless length($ENV{'form.language'});      $ENV{'form.language'}='any' unless length($ENV{'form.language'});
       #----------------------------------------------------------------
       # Allow restriction to multiple domains.
       #   I make the crazy assumption that there will never be a domain 'any'.
       #
       $ENV{'form.domains'} = 'any' if (! exists($ENV{'form.domains'}));
       my @allowed_domains = (ref($ENV{'form.domains'}) ? @{$ENV{'form.domains'}} 
                              :  ($ENV{'form.domains'}) );
       my %domain_hash = ();
       foreach (@allowed_domains) {
           $domain_hash{$_}++;
       }
       my @domains =&Apache::loncommon::get_domains();
       # adjust the size of the select box
       my $size = 4;
       my $size = (scalar @domains < ($size - 1) ? scalar @domains + 1 : $size);
       # standalone machines do not get to choose a domain to search.
       if ((scalar @domains) == 1) {
           $scrout .='<input type="hidden" name="domains" value="any" />'."\n";
       } else {
           $scrout.="\n".'<font color="#800000" face="helvetica"><b>'.
               'DOMAINS</b></font><br />'.
                   '<select name="domains" size="'.$size.'" multiple>'."\n".
                       '<option name="any" value="any" '.
                           ($domain_hash{'any'}? 'selected ' :'').
                           '>all domains</option>'."\n";
           foreach my $dom (sort @domains) {
               $scrout.="<option name=\"$dom\" ".
                   ($domain_hash{$dom} ? 'selected ' :'').">$dom</option>\n";
           }
           $scrout.="</select>\n";
       }
       #----------------------------------------------------------------
     $scrout.=&selectbox('Limit by language','language',      $scrout.=&selectbox('Limit by language','language',
  $ENV{'form.language'},%language);   $ENV{'form.language'},'any','Any Language',
        \&{Apache::loncommon::languagedescription},
    (&Apache::loncommon::languageids),
    );
 # ------------------------------------------------ Compute date selection boxes  # ------------------------------------------------ Compute date selection boxes
     $scrout.=<<CREATIONDATESTART;      $scrout.=<<CREATIONDATESTART;
 <p>  <p>
 <font color="#800000" face="helvetica"><b>LIMIT BY CREATION DATE RANGE:</b>  <font color="#800000" face="helvetica"><b>LIMIT BY CREATION DATE RANGE:</b>
 </font>  </font>
 <br>  <br />
 between:  between:
 CREATIONDATESTART  CREATIONDATESTART
     $scrout.=&dateboxes('creationdatestart',1,1,1976,      $scrout.=&dateboxes('creationdatestart',1,1,1976,
Line 187  CREATIONDATESTART Line 488  CREATIONDATESTART
  $ENV{'form.creationdatestart_day'},   $ENV{'form.creationdatestart_day'},
  $ENV{'form.creationdatestart_year'},   $ENV{'form.creationdatestart_year'},
  );   );
     $scrout.=<<CREATIONDATEEND;      $scrout.="and:\n";
 and:  
 CREATIONDATEEND  
     $scrout.=&dateboxes('creationdateend',12,31,2051,      $scrout.=&dateboxes('creationdateend',12,31,2051,
  $ENV{'form.creationdateend_month'},   $ENV{'form.creationdateend_month'},
  $ENV{'form.creationdateend_day'},   $ENV{'form.creationdateend_day'},
  $ENV{'form.creationdateend_year'},   $ENV{'form.creationdateend_year'},
  );   );
     $scrout.="</p>";      $scrout.="</p>";
   
     $scrout.=<<LASTREVISIONDATESTART;      $scrout.=<<LASTREVISIONDATESTART;
 <p>  <p>
 <font color="#800000" face="helvetica"><b>LIMIT BY LAST REVISION DATE RANGE:  <font color="#800000" face="helvetica"><b>LIMIT BY LAST REVISION DATE RANGE:
 </b></font>  </b></font>
 <br>between:  <br />between:
 LASTREVISIONDATESTART  LASTREVISIONDATESTART
     $scrout.=&dateboxes('lastrevisiondatestart',1,1,1976,      $scrout.=&dateboxes('lastrevisiondatestart',1,1,1976,
  $ENV{'form.lastrevisiondatestart_month'},   $ENV{'form.lastrevisiondatestart_month'},
Line 217  LASTREVISIONDATEEND Line 515  LASTREVISIONDATEEND
  $ENV{'form.lastrevisiondateend_year'},   $ENV{'form.lastrevisiondateend_year'},
  );   );
     $scrout.='</p>';      $scrout.='</p>';
   
     $scrout.=&searchphrasefield('Limit by publisher/owner','owner',  
  $ENV{'form.owner'});  
 # $metadatafields{'owner'});  
   
     $ENV{'form.copyright'}='any' unless length($ENV{'form.copyright'});      $ENV{'form.copyright'}='any' unless length($ENV{'form.copyright'});
     $scrout.=&selectbox('Limit by copyright/distribution','copyright',      $scrout.=&selectbox('Limit by copyright/distribution','copyright',
  $ENV{'form.copyright'},%cprtag);   $ENV{'form.copyright'},
    'any','Any copyright/distribution',
    \&{Apache::loncommon::copyrightdescription},
    (&Apache::loncommon::copyrightids),
    );
 # ------------------------------------------- Compute customized metadata field  # ------------------------------------------- Compute customized metadata field
     $scrout.=<<CUSTOMMETADATA;      $scrout.=<<CUSTOMMETADATA;
 <p>  <p>
 <font color="#800000" face="helvetica"><b>LIMIT BY OTHER METADATA FIELDS:</b>  <font color="#800000" face="helvetica"><b>LIMIT BY SPECIAL METADATA FIELDS:</b>
 </font>  </font>
 For author-specific metadata, enter in an expression in the form of   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>  <i>key</i>=<i>value</i> separated by operators such as AND, OR or NOT.<br />
 <b>Example:</b> grandmother=75 OR grandfather=85  <b>Example:</b> grandmother=75 OR grandfather=85
 <br>  <br />
 CUSTOMMETADATA  CUSTOMMETADATA
 $scrout.=&simpletextfield('custommetadata',$ENV{'form.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;
   
 # ---------------------------------------------------------------- Print screen  
     $r->print(<<ENDDOCUMENT);  
 <html>  
 <head>  
 <title>The LearningOnline Network with CAPA</title>  
 </head>  
 <body bgcolor="#FFFFFF">  
 <img align=right src=/adm/lonIcons/lonlogos.gif>  
 <h1>Search Catalog</h1>  
 <form method="post" action="/adm/searchcat">  
 $hidden  
 <hr>  
 <h3>Basic Search</h3>  
 <p>  <p>
 Enter terms or phrases separated by search operators  <font color="#800000" face="helvetica"><b>SHOW SPECIAL METADATA FIELDS:</b>
 such as AND or OR then press SEARCH below.  Terms should be specific  </font>
 to the title, author, subject, notes, or abstract information associated  Enter in a space-separated list of special metadata fields to show
 with a resource.  in a fielded listing for each record result.
 <br>  <br />
 ENDDOCUMENT  CUSTOMSHOW
     $r->print(&simpletextfield('basicexp',$ENV{'form.basicexp'}));      $scrout.=&simpletextfield('customshow',$ENV{'form.customshow'});
     $r->print(' ');      $scrout.=<<ENDDOCUMENT;
     $r->print(&simplecheckbox('titleonly',$ENV{'form.titleonly'}));  $advanced_buttons
     $r->print('<font color="#800000">Title only</font> ');  
     $r->print(&simplecheckbox('allversions',$ENV{'form.allversions'}));  
     $r->print(<<ENDDOCUMENT);  
 <font color="#800000">Search historic archives</font>  
 <br>  
 <input type="submit" name="basicsubmit" value="SEARCH">  
 <input type="reset" name="reset" value="RESET">  
 $closebutton  
 $basicviewselect  
 </p>  
 <hr>  
 <h3>Advanced Search</h3>  
 $scrout  
 <p>  
 <input type="submit" name="advancedsubmit" value="SEARCH">  
 <input type="reset" name="reset" value="RESET">  
 $closebutton  
 $advancedviewselect  
 </p>  
 </form>  </form>
 </body>  </body>
 </html>  </html>
 ENDDOCUMENT  ENDDOCUMENT
     return OK;      return $scrout;
 }   }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &make_persistent() 
   
   Returns a scalar which holds the current ENV{'form.*'} values in
   a 'hidden' html input tag.  This allows search interface information
   to be somewhat persistent.
   
   =cut
   
   ######################################################################
   ######################################################################
   
   sub make_persistent {
       my %save = %{shift()};
       my $persistent='';
       foreach my $name (keys %save) {
    if ($name =~ /^form\./ && $name !~ /submit/) {
               my @values = (ref($save{$name}) ? @{$save{$name}} : ($save{$name}));
       $name=~s/^form\.//;
               foreach (@values) {
                   s/\"/\'/g; # do not mess with html field syntax
                   next if (! $_ );
                   $persistent.=<<END;
   <input type="hidden" name="$name" value="$_" />
   END
               }
           }
       }
       return $persistent;
   }
   
   ######################################################################
   #                HTML form building functions                        #  
   ######################################################################
   
   =pod 
   
   =item HTML form building functions
   
   =over 4
   
   =cut
   
   ###############################################
   ###############################################
   
   =pod
   
   =item &simpletextfield() 
   
   Inputs: $name,$value,$size
   
   Returns a text input field with the given name, value, and size.  
   If size is not specified, a value of 20 is used.
   
 # --------------------------------------------------------- Various form fields  =cut
   
   ###############################################
   ###############################################
   
 sub simpletextfield {  sub simpletextfield {
     my ($name,$value)=@_;      my ($name,$value,$size)=@_;
     return '<input type=text name="'.$name.'" size=20 value="'.$value.'">';      $size = 20 if (! defined($size));
       return '<input type="text" name="'.$name.
           '" size="'.$size.'" value="'.$value.'" />';
 }  }
   
   ###############################################
   ###############################################
   
   =pod
   
   =item &simplecheckbox()
   
   Inputs: $name,$value
   
   Returns a simple check box with the given $name.
   If $value eq 'on' the box is checked.
   
   =cut
   
   ###############################################
   ###############################################
   
 sub simplecheckbox {  sub simplecheckbox {
     my ($name,$value)=@_;      my ($name,$value)=@_;
     my $checked='';      my $checked='';
     $checked="CHECKED" if $value eq 'on';      $checked="checked" if $value eq 'on';
     return '<input type=checkbox name="'.$name.'" '. $checked . '>';      return '<input type="checkbox" name="'.$name.'" '. $checked . ' />';
 }  }
   
   ###############################################
   ###############################################
   
   =pod
   
   =item &fieldtitle()
   
   Input: $title
   
   Returns a scalar with html which will display $title as a search
   field heading.
   
   =cut
   
   ###############################################
   ###############################################
   
   sub fieldtitle {
       my $title = uc(shift());
       return '<font color="#800000" face="helvetica"><b>'.$title.
           ':&nbsp;</b></font>';
   }
   
   ###############################################
   ###############################################
   
   =pod
   
   =item &searchphrasefield()
   
   Inputs: $title,$name,$value
   
   Returns html for a title line and an input field for entering search terms.
   The entry field (which is where the $name and $value are used) is a 50 column 
   simpletextfield.  The html returned is for a row in a three column table.
   
   =cut
   
   ###############################################
   ###############################################
       
 sub searchphrasefield {  sub searchphrasefield {
     my ($title,$name,$value)=@_;      my ($title,$name,$value)=@_;
     my $instruction=<<END;      return '<tr><td>'.&fieldtitle($title).'</td><td>'.
 Enter terms or phrases separated by search operators such          &simpletextfield($name,$value,50)."</td><td>&nbsp;</td></tr>\n";
 as AND or OR.  }
 END  
     my $uctitle=uc($title);  ###############################################
     return "\n<p><font color=\"#800000\" face=\"helvetica\"><b>$uctitle:</b>".  ###############################################
    "</FONT> $instruction<br>".  
            '<input type=text name="'.$name.'" size=80 value="'.$value.'">';  =pod
   
   =item &searchphrasefield_with_related()
   
   Inputs: $title,$name,$value
   
   Returns html for a title line and an input field for entering search terms
   and a check box for 'related words'.  The entry field (which is where the 
   $name and $value are used) is a 50 column simpletextfield.  The name of
   the related words checkbox is "$name_related".
   
   =cut
   
   ###############################################
   ###############################################
       
   sub searchphrasefield_with_related {
       my ($title,$name,$value)=@_;
       return '<tr><td>'.&fieldtitle($title).'</td><td>'.
           &simpletextfield($name,$value,50).'</td><td align="center">&nbsp;'.
               &simplecheckbox($name.'_related',$ENV{'form.'.$name.'_related'}).
                   "&nbsp;</td></tr>\n";
 }  }
   
   ###############################################
   ###############################################
   
   =pod
   
   =item &dateboxes()
   
   Returns html selection form elements for the specification of 
   the day, month, and year.
   
   =cut
   
   ###############################################
   ###############################################
   
 sub dateboxes {  sub dateboxes {
     my ($name,$defaultmonth,$defaultday,$defaultyear,      my ($name,$defaultmonth,$defaultday,$defaultyear,
  $currentmonth,$currentday,$currentyear)=@_;   $currentmonth,$currentday,$currentyear)=@_;
     ($defaultmonth,$defaultday,$defaultyear)=('','','');      ($defaultmonth,$defaultday,$defaultyear)=('','','');
     my $month=<<END;      #
 <select name="${name}_month">      # Day
 <option value='$defaultmonth'> </option>  
 <option value="1">January</option>  
 <option value="2">February</option>  
 <option value="3">March</option>  
 <option value="4">April</option>  
 <option value="5">May</option>  
 <option value="6">June</option>  
 <option value="7">July</option>  
 <option value="8">August</option>  
 <option value="9">September</option>  
 <option value="10">October</option>  
 <option value="11">November</option>  
 <option value="12">December</option>  
 </select>  
 END  
     $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth);  
     my $day=<<END;      my $day=<<END;
 <select name="${name}_day">  <select name="${name}_day">
 <option value='$defaultday'> </option>  <option value='$defaultday'> </option>
 <option value="1">1</option>  
 <option value="2">2</option>  
 <option value="3">3</option>  
 <option value="4">4</option>  
 <option value="5">5</option>  
 <option value="6">6</option>  
 <option value="7">7</option>  
 <option value="8">8</option>  
 <option value="9">9</option>  
 <option value="10">10</option>  
 <option value="11">11</option>  
 <option value="12">12</option>  
 <option value="13">13</option>  
 <option value="14">14</option>  
 <option value="15">15</option>  
 <option value="16">16</option>  
 <option value="17">17</option>  
 <option value="18">18</option>  
 <option value="19">19</option>  
 <option value="20">20</option>  
 <option value="21">21</option>  
 <option value="22">22</option>  
 <option value="23">23</option>  
 <option value="24">24</option>  
 <option value="25">25</option>  
 <option value="26">26</option>  
 <option value="27">27</option>  
 <option value="28">28</option>  
 <option value="29">29</option>  
 <option value="30">30</option>  
 <option value="31">31</option>  
 </select>  
 END  END
       for (my $i = 1; $i<=31; $i++) {
    $day.="<option value=\"$i\">$i</option>\n";
       }
       $day.="</select>\n";
     $day=~s/(\"$currentday\")/$1 SELECTED/ if length($currentday);      $day=~s/(\"$currentday\")/$1 SELECTED/ if length($currentday);
       #
       # Month
       my $month=<<END;
   <select name="${name}_month">
   <option value='$defaultmonth'> </option>
   END
       my $i = 1;
       foreach (qw/January February March April May June 
        July August September October November December /){
    $month .="<option value=\"$i\">$_</option>\n";
    $i++;
       }
       $month.="</select>\n";
       $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth);
       #
       # Year (obviously)
     my $year=<<END;      my $year=<<END;
 <select name="${name}_year">  <select name="${name}_year">
 <option value='$defaultyear'> </option>  <option value='$defaultyear'> </option>
 <option value="1976">1976</option>  
 <option value="1977">1977</option>  
 <option value="1978">1978</option>  
 <option value="1979">1979</option>  
 <option value="1980">1980</option>  
 <option value="1981">1981</option>  
 <option value="1982">1982</option>  
 <option value="1983">1983</option>  
 <option value="1984">1984</option>  
 <option value="1985">1985</option>  
 <option value="1986">1986</option>  
 <option value="1987">1987</option>  
 <option value="1988">1988</option>  
 <option value="1989">1989</option>  
 <option value="1990">1990</option>  
 <option value="1991">1991</option>  
 <option value="1992">1992</option>  
 <option value="1993">1993</option>  
 <option value="1994">1994</option>  
 <option value="1995">1995</option>  
 <option value="1996">1996</option>  
 <option value="1997">1997</option>  
 <option value="1998">1998</option>  
 <option value="1999">1999</option>  
 <option value="2000">2000</option>  
 <option value="2001">2001</option>  
 <option value="2002">2002</option>  
 <option value="2003">2003</option>  
 <option value="2004">2004</option>  
 <option value="2005">2005</option>  
 <option value="2006">2006</option>  
 <option value="2007">2007</option>  
 <option value="2008">2008</option>  
 <option value="2009">2009</option>  
 <option value="2010">2010</option>  
 <option value="2011">2011</option>  
 <option value="2012">2012</option>  
 <option value="2013">2013</option>  
 <option value="2014">2014</option>  
 <option value="2015">2015</option>  
 <option value="2016">2016</option>  
 <option value="2017">2017</option>  
 <option value="2018">2018</option>  
 <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>  
 <option value="2025">2025</option>  
 <option value="2026">2026</option>  
 <option value="2027">2027</option>  
 <option value="2028">2028</option>  
 <option value="2029">2029</option>  
 <option value="2030">2030</option>  
 <option value="2031">2031</option>  
 <option value="2032">2032</option>  
 <option value="2033">2033</option>  
 <option value="2034">2034</option>  
 <option value="2035">2035</option>  
 <option value="2036">2036</option>  
 <option value="2037">2037</option>  
 <option value="2038">2038</option>  
 <option value="2039">2039</option>  
 <option value="2040">2040</option>  
 <option value="2041">2041</option>  
 <option value="2042">2042</option>  
 <option value="2043">2043</option>  
 <option value="2044">2044</option>  
 <option value="2045">2045</option>  
 <option value="2046">2046</option>  
 <option value="2047">2047</option>  
 <option value="2048">2048</option>  
 <option value="2049">2049</option>  
 <option value="2050">2050</option>  
 <option value="2051">2051</option>  
 </select>  
 END  END
       my $maxyear = 2051; 
       for (my $i = 1976; $i<=$maxyear; $i++) {
    $year.="<option value=\"$i\">$i</option>\n";
       }
       $year.="</select>\n";
     $year=~s/(\"$currentyear\")/$1 SELECTED/ if length($currentyear);      $year=~s/(\"$currentyear\")/$1 SELECTED/ if length($currentyear);
     return "$month$day$year";      return "$month$day$year";
 }  }
   
   ###############################################
   ###############################################
   
   =pod
   
   =item &selectbox()
   
   Returns a scalar containing an html <select> form.  
   
   Inputs: 
   
   =over 4
   
   =item $title 
   
   Printed above the select box, in uppercase.  If undefined, only a select
   box will be returned, with no additional html.
   
   =item $name 
   
   The name element of the <select> tag.
   
   =item $default 
   
   The default value of the form.  Can be $anyvalue, or in @idlist.
   
   =item $anyvalue 
   
   The <option value="..."> used to indicate a default of 
   none of the values.  Can be undef.
   
   =item $anytag 
   
   The text associate with $anyvalue above.
   
   =item $functionref 
   
   Each element in @idlist will be passed as a parameter 
   to the function referenced here.  The return value of the function should
   be a scalar description of the items.  If this value is undefined the 
   description of each item in @idlist will be the item name.
   
   =item @idlist 
   
   The items to be selected from.  One of these or $anyvalue will be the 
   value returned by the form element, $ENV{form.$name}.
   
   =back
   
   =cut
   
   ###############################################
   
 sub selectbox {  sub selectbox {
     my ($title,$name,$value,%options)=@_;      my ($title,$name,$default,$anyvalue,$anytag,$functionref,@idlist)=@_;
     my $uctitle=uc($title);      if (! defined($functionref)) { $functionref = sub { $_[0]}; }
     my $selout="\n<p><font color=\"#800000\" face=\"helvetica\"><b>$uctitle:".      my $selout='';
  "</b></font><br>".'<select name="'.$name.'">';      if (defined($title)) {
     map {          my $uctitle=uc($title);
           $selout="\n".'<p><font color="#800000" face="helvetica">'.
               '<b>'.$uctitle.': </b></font>';
       }
       $selout .= '<select name="'.$name.'">';
       unshift @idlist,$anyvalue if (defined($anyvalue));
       foreach (@idlist) {
         $selout.='<option value="'.$_.'"';          $selout.='<option value="'.$_.'"';
         if ($_ eq $value) { $selout.=' selected'; }          if ($_ eq $default and !/^any$/) {
         $selout.='>'.$options{$_}.'</option>';      $selout.=' selected >'.&{$functionref}($_).'</option>';
     } sort keys %options;   }
     return $selout.'</select>';   elsif ($_ eq $default and /^$anyvalue$/) {
       $selout.=' selected >'.$anytag.'</option>';
    }
           else {$selout.='>'.&{$functionref}($_).'</option>';}
       }
       return $selout.'</select>'.(defined($title)?'</p>':' ');
 }  }
   
 # ----------------------------------------------- Performing an advanced search  ######################################################################
 sub advancedsearch {  #                End of HTML form building functions                 #  
     my ($r,$envhash)=@_;  ######################################################################
     my %ENV=%{$envhash};  
   =pod
   
   =back 
   
   =cut
   
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &parse_advanced_search()
   
   Parse advanced search form and return the following:
   
   =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)=@_;
     my $fillflag=0;      my $fillflag=0;
       my $pretty_search_string = "<br />\n";
       # Clean up fields for safety
       for my $field ('title','author','subject','keywords','url','version',
      'creationdatestart_month','creationdatestart_day',
      'creationdatestart_year','creationdateend_month',
      'creationdateend_day','creationdateend_year',
      'lastrevisiondatestart_month','lastrevisiondatestart_day',
      'lastrevisiondatestart_year','lastrevisiondateend_month',
      'lastrevisiondateend_day','lastrevisiondateend_year',
      'notes','abstract','mime','language','owner',
      'custommetadata','customshow','category') {
    $ENV{"form.$field"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
       }
       foreach ('mode','form','element') {
    # is this required?  Hmmm.
    next unless (exists($ENV{"form.$_"}));
    $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
    $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
       }
       # Preprocess the category form element.
       if ($ENV{'form.category'} ne 'any') {
           my @extensions = &Apache::loncommon::filecategorytypes
               ($ENV{'form.category'});
           $ENV{'form.mime'} = join ' OR ',@extensions;
       }
       # Check to see if enough information was filled in
     for my $field ('title','author','subject','keywords','url','version',      for my $field ('title','author','subject','keywords','url','version',
    'notes','abstract','mime','language','owner',     'notes','abstract','mime','language','owner',
    'custommetadata') {     'custommetadata') {
Line 484  sub advancedsearch { Line 928  sub advancedsearch {
     $fillflag++;      $fillflag++;
  }   }
     }      }
   
     unless ($fillflag) {      unless ($fillflag) {
  &output_blank_field_error($r);   &output_blank_field_error($r);
  return OK;   return ;
     }      }
       # Turn the form input into a SQL-based query
     my $query='';      my $query='';
   
     my @queries;      my @queries;
     # Go through logical expression AND/OR/NOT phrase fields.      my $font = '<font color="#800000" face="helvetica">';
       # Evaluate logical expression AND/OR/NOT phrase fields.
     foreach my $field ('title','author','subject','notes','abstract','url',      foreach my $field ('title','author','subject','notes','abstract','url',
        'keywords','version','owner') {         'keywords','version','owner','mime') {
  if ($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,$searchphrase);
           }
     }      }
     if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') {      # I dislike the hack below.
  push @queries,"(language like \"\%$ENV{'form.language'}\%\")";      if ($ENV{'form.category'}) {
           $ENV{'form.mime'}='';
     }      }
     if ($ENV{'form.mime'} and $ENV{'form.mime'} ne 'any') {      # Evaluate option lists
  push @queries,"(mime like \"\%$ENV{'form.mime'}\%\")";      if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') {
    push @queries,"(language like \"$ENV{'form.language'}\")";
           $pretty_search_string.=$font."language</font>= ".
               &Apache::loncommon::languagedescription($ENV{'form.language'}).
                   "<br />\n";
     }      }
     if ($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";
     }      }
       #
       # Evaluate date windows
     my $datequery=&build_date_queries(      my $datequery=&build_date_queries(
  $ENV{'form.creationdatestart_month'},   $ENV{'form.creationdatestart_month'},
  $ENV{'form.creationdatestart_day'},   $ENV{'form.creationdatestart_day'},
Line 524  sub advancedsearch { Line 990  sub advancedsearch {
  $ENV{'form.lastrevisiondateend_day'},   $ENV{'form.lastrevisiondateend_day'},
  $ENV{'form.lastrevisiondateend_year'},   $ENV{'form.lastrevisiondateend_year'},
  );   );
       # Test to see if date windows are legitimate
     if ($datequery=~/^Incorrect/) {      if ($datequery=~/^Incorrect/) {
  &output_date_error($r,$datequery);   &output_date_error($r,$datequery);
  return OK;   return ;
     }      } elsif ($datequery) {
     elsif ($datequery) {          # Here is where you would set up pretty_search_string to output
           # date query information.
  push @queries,$datequery;   push @queries,$datequery;
     }      }
       # Process form information for custom metadata querying
       my $customquery=undef;
       if ($ENV{'form.custommetadata'}) {
           $pretty_search_string .=$font."Custom Metadata Search</font>: <b>".
               $ENV{'form.custommetadata'}."</b><br />\n";
    $customquery=&build_custommetadata_query('custommetadata',
         $ENV{'form.custommetadata'});
       }
       my $customshow=undef;
       if ($ENV{'form.customshow'}) {
           $pretty_search_string .=$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 = undef;
       # $ENV{'form.domains'} can be either a scalar or an array reference.
       # We need an array.
       my @allowed_domains = (ref($ENV{'form.domains'}) ? @{$ENV{'form.domains'}} 
                              :  ($ENV{'form.domains'}) );
       my %domain_hash = ();
       my $pretty_domains_string;
       foreach (@allowed_domains) {
           $domain_hash{$_}++;
       }
       if ($domain_hash{'any'}) {
           $pretty_domains_string = "Searching all domains.";
       } else {
           if (@allowed_domains > 1) {
               $pretty_domains_string = "Searching domains:";
           } else {
               $pretty_domains_string = "Searching 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,$_;
               }
           }
       }
       $pretty_search_string .= $pretty_domains_string."<br />\n";
       #
     if (@queries) {      if (@queries) {
  $query=join(" AND ",@queries);   $query=join(" AND ",@queries);
  $query="select * from metadata where $query";   $query="select * from metadata where $query";
  my $reply=&Apache::lonnet::metadata_query($query);      } elsif ($customquery) {
  &output_results('Advanced',$r,$envhash,$query,$reply);          $query = '';
     }  
     else {  
  &output_results('Advanced',$r,$envhash,$query);  
     }      }
     return OK;      return ($query,$customquery,$customshow,$libraries_to_query,
               $pretty_search_string);
 }  }
   
 # ---------------------------------------------------- see if a field is filled  ######################################################################
 sub filled {  ######################################################################
     my ($field)=@_;  
     if ($field=~/\S/) {  =pod 
  return 1;  
     }  =item &parse_basic_search() 
     else {  
  return 0;  
     }  
 }  
   
 # --------------------------------------------------- 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)=@_;
       # Clean up fields for safety
       for my $field ('basicexp') {
    $ENV{"form.$field"}=~s/[^\w\s\(\)\-]//g;
       }
       foreach ('mode','form','element') {
    # is this required?  Hmmm.
    next unless (exists($ENV{"form.$_"}));
    $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
    $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
       }
   
       # Check to see if enough is filled in
     unless (&filled($ENV{'form.basicexp'})) {      unless (&filled($ENV{'form.basicexp'})) {
  &output_blank_field_error($r);   &output_blank_field_error($r);
  return OK;   return OK;
     }      }
       my $pretty_search_string = '<b>'.$ENV{'form.basicexp'}.'</b>';
       my $search_string = $ENV{'form.basicexp'};
       if ($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.";
           }
       }
       &Apache::lonnet::logthis("Search String: $search_string");
       # 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'));
     $query="select * from metadata where concat($concatarg) like '\%$ENV{'form.basicexp'}\%'";      $concatarg='title' if $ENV{'form.titleonly'};
     my $reply=&Apache::lonnet::metadata_query($query);      $query=&build_SQL_query('concat('.$concatarg.')',$search_string);
     &output_results('Basic',$r,$envhash,$query,$reply);      $pretty_search_string .= "<br />\n";
     return OK;      return 'select * from metadata where '.$query,$pretty_search_string;
 }  
   
 # ---------------- Message to output when there are not enough fields filled in  
 sub output_blank_field_error {  
     my ($r)=@_;  
     # make query information persistent to allow for subsequent revision  
     my $persistent='';  
     map {  
  if (/^form\./ && !/submit/) {  
     my $name=$_;  
     my $key=$name;  
     $name=~s/^form\.//;  
     $persistent.=<<END;  
 <INPUT TYPE='hidden' NAME='$name' VALUE='$ENV{$key}'>  
 END  
         }  
     } (keys %ENV);  
   
     $r->print(<<BEGINNING);  
 <html>  
 <head>  
 <title>The LearningOnline Network with CAPA</title>  
 BEGINNING  
     $r->print(<<RESULTS);  
 </head>  
 <body bgcolor="#ffffff">  
 <img align=right src=/adm/lonIcons/lonlogos.gif>  
 <h1>Search Catalog</h1>  
 <form method="post" action="/adm/searchcat">  
 $persistent  
 <input type='button' value='Revise search request'  
 onClick='this.form.submit();'>  
 $closebutton  
 <hr>  
 <h3>Helpful Message</h3>  
 <p>  
 Incorrect search query due to blank entry fields.  
 You need to fill in the relevant  
 fields on the search page in order for a query to be  
 processed.  
 </p>  
 </body>  
 </html>  
 RESULTS  
 }  }
   
 # ----------------------------- format and output results based on a reply list  
 sub output_results {  
     my ($mode,$r,$envhash,$query,@replylist)=@_;  
     my %ENV=%{$envhash};  
     my $compiledresult='';  
   
     foreach my $reply (@replylist) {  ######################################################################
   ######################################################################
   
  my @results;  =pod 
   
  my $replyfile='';  =item &related_version
  $reply=~/^([\.\w]+)$/; # must do since 'use strict' checks for tainting  
  $replyfile=$r->dir_config('lonDaemons').'/tmp/'.$1;  
  $reply=~/(.*?)\_/;  
  my $hostname=$1;  
  sleep 3; # temporary fix, need to check for completion and status  
  {  
     while (1) {  
  last if -e $replyfile;  
  sleep 1;  
     }  
     # QUESTION: how should I handle this error condition..  
     # I'm sure there is syntax elsewhere I can use..  
     my $fh=Apache::File->new($replyfile) or  
  ($r->print('file cannot be opened') and return OK);  
     @results=<$fh>;  
  }  
   
  foreach my $result (@results) {  
     my @fields=map  
                    {&Apache::lonnet::unescape($_)}  
                    (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;  
     $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  
             my $httphost=$ENV{'HTTP_HOST'};  
   
     my $viewselect;  Modifies an input string to include related words.  Words in the string
     if ($mode eq 'Basic') {  are replaced with parenthesized lists of 'OR'd words.  For example
  $viewselect=$ENV{'form.basicviewselect'};  "torque" is replaced with "(torque OR word1 OR word2 OR ...)".  
     }  
     elsif ($mode eq 'Advanced') {  Note: Using this twice on a string is probably silly.
  $viewselect=$ENV{'form.advancedviewselect'};  
     }  =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));
   }
   
             if ($viewselect eq 'Detailed Citation View') {  ######################################################################
  $compiledresult.=&detailed_citation_view(@fields,  ######################################################################
  $hostname,$httphost);  
     }  
             elsif ($viewselect eq 'Summary View') {  
  $compiledresult.=&summary_view(@fields,$hostname,$httphost);  
     }  
             elsif ($viewselect eq 'Fielded Format') {  
  $compiledresult.=&fielded_format_view(@fields,$hostname,  
       $httphost);  
     }  
             elsif ($viewselect eq 'XML/SGML') {  
  $compiledresult.=&xml_sgml_view(@fields,$hostname,$httphost);  
     }  
   
         }  =pod 
   
  unless ($compiledresult) {  =item &build_SQL_query() 
     $compiledresult="There were no results that matched your query";  
  }  
   
  # make query information persistent to allow for subsequent revision  Builds a SQL query string from a logical expression with AND/OR keywords
  my $persistent='';  using Text::Query and &recursive_SQL_query_builder()
  map {  
     if (/^form\./ && !/submit/) {  
  my $name=$_;  
  my $key=$name;  
  $name=~s/^form\.//;  
  $persistent.=<<END;  
 <INPUT TYPE='hidden' NAME='$name' VALUE='$ENV{$key}'>  
 END  
             }  
  } (keys %ENV);  
   
  $r->print(<<BEGINNING);  =cut
 <html>  
 <head>  
 <title>The LearningOnline Network with CAPA</title>  
 BEGINNING  
         $r->print(<<SCRIPT) if $ENV{'form.catalogmode'} eq 'interactive';  
 <script>  
     function select_data(title,url) {  
  changeTitle(title);  
  changeURL(url);  
     }  
     function changeTitle(val) {  
  if (opener.inf.document.forms.resinfo.elements.t) {  
     opener.inf.document.forms.resinfo.elements.t.value=val;  
  }  
     }  
     function changeURL(val) {  
  if (opener.inf.document.forms.resinfo.elements.u) {  
     opener.inf.document.forms.resinfo.elements.u.value=val;  
  }  
     }  
 </script>  
 SCRIPT  
         $r->print(<<RESULTS);  
 </head>  
 <body bgcolor="#ffffff">  
 <img align=right src=/adm/lonIcons/lonlogos.gif>  
 <h1>Search Catalog</h1>  
 <form method="post" action="/adm/searchcat">  
 <input type='button' value='Revise search request'  
 onClick='this.form.submit();'>  
 $closebutton  
 $persistent  
 <hr>  
 <h3>Search Query</h3>  
 RESULTS  
     if ($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(<<RESULTS);  
 <h3>Search Results</h3>  
 $compiledresult  
 </body>  
 </html>  
 RESULTS  
     }  
 }  
   
 # ------------------------------------------------------------- build_SQL_query  ######################################################################
   ######################################################################
 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 781  sub build_SQL_query { Line 1171  sub build_SQL_query {
     return $sql_query;      return $sql_query;
 }  }
   
 # - Recursively parse a reverse notation expression into a SQL query expression  ######################################################################
   ######################################################################
   
   =pod 
   
   =item &build_custommetadata_query() 
   
   Constructs a custom metadata query using a rather heinous regular
   expression.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub build_custommetadata_query {
       my ($field_name,$logic_statement)=@_;
       my $q=new Text::Query('abc',
     -parse => 'Text::Query::ParseAdvanced',
     -build => 'Text::Query::BuildAdvancedString');
       $q->prepare($logic_statement);
       my $matchexp=${$q}{'-parse'}{'-build'}{'matchstring'};
       # quick fix to change literal into xml tag-matching
       # will eventually have to write a separate builder module
       # wordone=wordtwo becomes\<wordone\>[^\<] *wordtwo[^\<]*\<\/wordone\>
       $matchexp =~ s/(\w+)\\=([\w\\\+]+)?# wordone=wordtwo is changed to 
                    /\\<$1\\>?#           \<wordone\>
                      \[\^\\<\]?#        [^\<]         
                      \*$2\[\^\\<\]?#           *wordtwo[^\<]
                      \*\\<\\\/$1\\>?#                        *\<\/wordone\>
                      /g;
       return $matchexp;
   }
   
   ######################################################################
   ######################################################################
   
   =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);
Line 793  sub recursive_SQL_query_build { Line 1228  sub recursive_SQL_query_build {
  if ($key eq 'literal') {   if ($key eq 'literal') {
     $replacement="($dkey like \"\%$value\%\")";      $replacement="($dkey like \"\%$value\%\")";
  }   }
    elsif ($key eq 'not') {
       $value=~s/like/not like/;
   #    $replacement="($dkey not like $value)";
       $replacement="$value";
    }
  elsif ($key eq 'and') {   elsif ($key eq 'and') {
     $value=~/(.*[\"|\)]) ([|\(|\^].*)/;      $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
     $replacement="($1 AND $2)";      $replacement="($1 AND $2)";
Line 810  sub recursive_SQL_query_build { Line 1250  sub recursive_SQL_query_build {
     &recursive_SQL_query_build($dkey,$pattern);      &recursive_SQL_query_build($dkey,$pattern);
 }  }
   
 # ------------------------------------------------------ Detailed Citation View  ######################################################################
 sub detailed_citation_view {  ######################################################################
     my ($title,$author,$subject,$url,$keywords,$version,  
  $notes,$shortabstract,$mime,$lang,  
  $creationdate,$lastrevisiondate,$owner,$copyright,  
  $hostname,$httphost)=@_;  
     my $result=<<END;  
 <i>$owner</i>, last revised $lastrevisiondate  
 <h3><A HREF="http://$httphost$url" TARGET='search_preview'>$title</A></h3>  
 <h3>$author</h3>  
 </p>  
 <p>  
 <b>Subject:</b> $subject<br>  
 <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>  
 $shortabstract  
 </p>  
 END  
     return $result;  
 }  
   
 # ---------------------------------------------------------------- Summary View  =pod 
 sub summary_view {  
     my ($title,$author,$subject,$url,$keywords,$version,  
  $notes,$shortabstract,$mime,$lang,  
  $creationdate,$lastrevisiondate,$owner,$copyright,  
  $hostname,$httphost)=@_;  
     my $result=<<END;  
 <a href="http://$httphost$url" TARGET='search_preview'>$author</a><br />  
 $title<br />  
 $owner -- $lastrevisiondate<br />  
 $cprtag{$copyright}<br />  
 </p>  
 END  
     return $result;  
 }  
   
 # -------------------------------------------------------------- Fielded Format  =item &build_date_queries() 
 sub fielded_format_view {  
     my ($title,$author,$subject,$url,$keywords,$version,  
  $notes,$shortabstract,$mime,$lang,  
  $creationdate,$lastrevisiondate,$owner,$copyright,  
  $hostname,$httphost)=@_;  
     my $result=<<END;  
 <b>URL: </b> <A HREF="http://$httphost$url" TARGET='search_preview'>$url</A>  
 <br />  
 <b>Title:</b> $title<br />  
 <b>Author(s):</b> $author<br />  
 <b>Subject:</b> $subject<br />  
 <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 />  
 </p>  
 END  
     return $result;  
 }  
   
 # -------------------------------------------------------------------- XML/SGML  Builds a SQL logic query to check time/date entries.
 sub xml_sgml_view {  Also reports errors (check for /^Incorrect/).
     my ($title,$author,$subject,$url,$keywords,$version,  
  $notes,$shortabstract,$mime,$lang,  =cut
  $creationdate,$lastrevisiondate,$owner,$copyright,  
  $hostname,$httphost)=@_;  
     my $result=<<END;  
 <pre>  
 &lt;LonCapaResource&gt;  
 &lt;url&gt;$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>  
 END  
     return $result;  
 }  
   
   ######################################################################
   ######################################################################
 sub build_date_queries {  sub build_date_queries {
     my ($cmonth1,$cday1,$cyear1,$cmonth2,$cday2,$cyear2,      my ($cmonth1,$cday1,$cyear1,$cmonth2,$cday2,$cyear2,
  $lmonth1,$lday1,$lyear1,$lmonth2,$lday2,$lyear2)=@_;   $lmonth1,$lday1,$lyear1,$lmonth2,$lday2,$lyear2)=@_;
Line 926  sub build_date_queries { Line 1275  sub build_date_queries {
    "a starting month, day, and year and an ending month, ".     "a starting month, day, and year and an ending month, ".
    "day, and year.";     "day, and year.";
  }   }
  my $cnumeric1="$cyear1$cmonth1$cday1";   my $cnumeric1=sprintf("%d%2d%2d",$cyear1,$cmonth1,$cday1);
  $cnumeric1+=0;   $cnumeric1+=0;
  my $cnumeric2="$cyear2$cmonth2$cday2";   my $cnumeric2=sprintf("%d%2d%2d",$cyear2,$cmonth2,$cday2);
  $cnumeric2+=0;   $cnumeric2+=0;
  if ($cnumeric1>$cnumeric2) {   if ($cnumeric1>$cnumeric2) {
     return "Incorrect entry for the creation date.  The starting ".      return "Incorrect entry for the creation date.  The starting ".
Line 945  sub build_date_queries { Line 1294  sub build_date_queries {
    "specify a starting month, day, and year and an ending ".     "specify a starting month, day, and year and an ending ".
    "month, day, and year.";     "month, day, and year.";
  }   }
  my $lnumeric1="$lyear1$lmonth1$lday1";   my $lnumeric1=sprintf("%d%2d%2d",$lyear1,$lmonth1,$lday1);
  $lnumeric1+=0;   $lnumeric1+=0;
  my $lnumeric2="$lyear2$lmonth2$lday2";   my $lnumeric2=sprintf("%d%2d%2d",$lyear2,$lmonth2,$lday2);
  $lnumeric2+=0;   $lnumeric2+=0;
  if ($lnumeric1>$lnumeric2) {   if ($lnumeric1>$lnumeric2) {
     return "Incorrect entry for the last revision date.  The ".      return "Incorrect entry for the last revision date.  The ".
Line 963  sub build_date_queries { Line 1312  sub build_date_queries {
     return '';      return '';
 }  }
   
 sub output_date_error {  ######################################################################
     my ($r,$message)=@_;  ######################################################################
   
   =pod 
   
   =item &output_results() 
   
   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.)
   
   =cut
   
   ######################################################################
   ######################################################################
   sub output_results {
   #    &Apache::lonnet::logthis("output_results:".time);
       my $fnum; # search result counter
       my ($mode,$r,$replyref,$hidden)=@_;
       my %rhash=%{$replyref};
       my $compiledresult='';
       my $timeremain=300; # (seconds)
       my $elapsetime=0;
       my $resultflag=0;
       my $tflag=1;
       ##
       ## Set viewing function
       ##
       my $viewfunction = $Views{$ENV{'form.viewselect'}};
       if (!defined($viewfunction)) {
           $r->print("Internal Error - Bad view selected.\n");
           $r->rflush();
           return;
       }
       #
     # make query information persistent to allow for subsequent revision      # make query information persistent to allow for subsequent revision
     my $persistent='';      my $persistent=&make_persistent(\%ENV);
     map {      #
  if (/^form\./ && !/submit/) {      # Begin producing output
     my $name=$_;      $r->rflush();
     my $key=$name;      #
     $name=~s/^form\.//;      # begin showing the cataloged results
     $persistent.=<<END;      my $action = "/adm/searchcat";
 <INPUT TYPE='hidden' NAME='$name' VALUE='$ENV{$key}'>      if ($mode eq 'Basic') { 
           $action .= "?reqinterface=basic";
       } elsif ($mode eq 'Advanced') {
           $action .= "?reqinterface=advanced";
       }
       $r->print(<<CATALOGCONTROLS);
   <form name='results' method="post" action="$action">
   $hidden
   <input type='hidden' name='acts' value='' />
   <input type='button' value='Revise search request'
   onClick='this.form.submit();' />
   $importbutton
   $closebutton
   $persistent
   <hr />
   CATALOGCONTROLS
       #
       # make the pop-up window for status
       $r->print(&make_popwin(%rhash));
       $r->rflush();
       ##
       ## Prepare for the main loop below
       ##
       my $servercount=0;
       my $hitcountsum=0;
       my $servernum=(keys %rhash);
       my $serversleft=$servernum;
       ##
       ## Run until we run out of time or we run out of servers
       ##
       while($serversleft && $timeremain) {
         ##
         ## %rhash has servers deleted from it as results come in 
         ## (within the foreach loop below).
         ##
         foreach my $rkey (sort keys %rhash) {
   #        &Apache::lonnet::logthis("Server $rkey:".time);
    $servercount++;
    $compiledresult='';
    my $reply=$rhash{$rkey};
    my @results;
    if ($reply eq 'con_lost') {
       &popwin_imgupdate($r,$rkey,"srvbad.gif");
       $serversleft--;
               delete $rhash{$rkey};
    } else {
               # must do since 'use strict' checks for tainting
       $reply=~/^([\.\w]+)$/; 
       my $replyfile=$r->dir_config('lonDaemons').'/tmp/'.$1;
       $reply=~/(.*?)\_/;
               for (my $counter=0;$counter<2;$counter++) {
                   if (-e $replyfile && ! -e "$replyfile.end") {
                       &popwin_imgupdate($r,$rkey,"srvhalf.gif");
                       &popwin_js($r,'popwin.hc["'.$rkey.'"]='.
                                  '"still transferring..."'.';');
                   }
                   # Are we finished transferring data?
                   if (-e "$replyfile.end") {
                       $serversleft--;
                       delete $rhash{$rkey};
                       if (-s $replyfile) {
                           &popwin_imgupdate($r,$rkey,"srvgood.gif");
                           my $fh;
                           unless ($fh=Apache::File->new($replyfile)){ 
                               # Is it really appropriate to die on this error?
                               $r->print('ERROR: file '.
                                         $replyfile.' cannot be opened');
                               return OK;
                           }
                           @results=<$fh> if $fh;
                           my $hits =@results;
                           &popwin_js($r,'popwin.hc["'.$rkey.'"]='.
                                      $hits.';');
                           $hitcountsum+=$hits;
                           &popwin_js($r,'popwin.document.forms.popremain.'.
                                      'numhits.value='.$hitcountsum.';');
                       } else {
                           &popwin_imgupdate($r,$rkey,"srvempty.gif");
                           &popwin_js($r,'popwin.hc["'.$rkey.'"]=0;');
                       }
                       last;
                   } # end of if ( -e "$replyfile.end")
                   last unless $timeremain;
                   sleep 1;    # wait for daemons to write files?
                   $timeremain--;
                   $elapsetime++;
                   &popwin_js($r,"popwin.document.popremain.".
                              "elapsetime.value=$elapsetime;");
       }
       &popwin_js($r,'popwin.document.whirly.'.
          'src="/adm/lonIcons/lonanimend.gif";');
    } # end of if ($reply eq 'con_lost') else statement
           my %Fields = undef;     # Holds the data to be sent to the various 
                                   # *_view routines.
           my ($extrashow,$customfields,$customhash) = 
                                       &handle_custom_fields(\@results);
           my @customfields = @$customfields;
           my %customhash   = %$customhash;
    untie %groupsearch_db if (tied %groupsearch_db);
           #
    if (! tie(%groupsearch_db,'GDBM_File',$diropendb,&GDBM_WRCREAT,0640)) {
       $r->print('<html><head></head><body>Unable to tie hash to db '.
                         'file</body></html>');
           } else {
       if ($ENV{'form.launch'} eq '1') {
    &start_fresh_session();
       }
       foreach my $result (@results) {
    next if $result=~/^custom\=/;
    chomp $result;
    next unless $result;
                   %Fields = &parse_raw_result($result,$rkey);
                   #
                   # Check copyright tags and skip results the user cannot use
                   my (undef,undef,$resdom,$resname) = split('/',$Fields{'url'});
                   # Check for priv
                   if (($Fields{'copyright'} eq 'priv') && 
                       (($ENV{'user.name'} ne $resname) &&
                        ($ENV{'user.domain'} ne $resdom))) {
                       next;
                   }
                   # Check for domain
                   if (($Fields{'copyright'} eq 'domain') &&
                       ($ENV{'user.domain'} ne $resdom)) {
                       next;
                   }
                   #
    $Fields{'extrashow'}=$extrashow;
    if ($extrashow) {
       foreach my $field (@customfields) {
    my $value='';
    $value = $1 if ($customhash{$Fields{'url'}}=~/\<{$field}[^\>]*\>(.*?)\<\/{$field}[^\>]*\>/s);
                           $Fields{'extrashow'}=~s/\<\!\-\- $field \-\-\>/ $value/g;
                       }
                   }
                   $compiledresult.="\n<p>\n";
                   if ($ENV{'form.catalogmode'} eq 'interactive') {
                       my $titleesc=$Fields{'title'};
                       $titleesc=~s/\'/\\'/; # '
                       $compiledresult.=<<END if ($ENV{'form.catalogmode'} eq 'interactive');
   <font size='-1'><INPUT TYPE="button" NAME="returnvalues" VALUE="SELECT"
   onClick="javascript:select_data('$titleesc','$Fields{'url'}')">
   </font>
   <br />
   END
                   }
                   if ($ENV{'form.catalogmode'} eq 'groupsearch') {
       $fnum+=0;
       $groupsearch_db{"pre_${fnum}_link"}=$Fields{'url'};
       $groupsearch_db{"pre_${fnum}_title"}=$Fields{'title'};
       $compiledresult.=<<END;
   <font size='-1'>
   <input type="checkbox" name="returnvalues" value="SELECT"
   onClick="javascript:queue($fnum)" />
   </font>
   <br />
 END  END
   # <input type="hidden" name="title$fnum" value="$title" />
   # <input type="hidden" name="url$fnum" value="$url" />
                       $fnum++;
    }
                   # Render the result into html
                   $compiledresult.= &$viewfunction(%Fields, hostname => $rkey );
                   if ($compiledresult or $servercount!=$servernum) {
                       $compiledresult.="<hr align='left' width='200' noshade />";
                   }
               }
               untie %groupsearch_db;
         }          }
     } (keys %ENV);   if ($compiledresult) {
       $resultflag=1;
               $r->print($compiledresult);
    }
         } # End of foreach loop over servers remaining
       }   # End of big loop - while($serversleft && $timeremain)
       unless ($resultflag) {
           $r->print("\nThere were no results that matched your query\n");
       }
       $r->print('<script type="text/javascript">'.'popwin.close()</script>'.
                 "\n"); 
       $r->print("</body>\n</html>\n");
       $r->rflush(); 
       return;
   }
   
   ###########################################################
   ###########################################################
   
   =pod
   
   =item &parse_raw_result()
   
   Takes a line from the file of results and parse it.  Returns a hash 
   with keys for the following fields:
   'title', 'author', 'subject', 'url', 'keywords', 'version', 'notes', 
   'abstract', 'mime', 'lang', 'owner', 'copyright', 'creationdate', 
   'lastrevisiondate'.
   
   In addition, the following tags are set by calling the appropriate 
   lonnet function: 'language', 'cprtag', '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) = @_;
       # Check for a comma - if it is there then we do not need to unescape the
       # string.  There seems to be some kind of problem with some items in
       # the database - the entire string gets sent out unescaped...?
       unless ($result =~ /,/) {
           $result = &Apache::lonnet::unescape($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 %Fields = 
           ( title     => &Apache::lonnet::unescape($title),
             author    => &Apache::lonnet::unescape($author),
             subject   => &Apache::lonnet::unescape($subject),
             url       => &Apache::lonnet::unescape($url),
             keywords  => &Apache::lonnet::unescape($keywords),
             version   => &Apache::lonnet::unescape($version),
             notes     => &Apache::lonnet::unescape($notes),
             abstract  => &Apache::lonnet::unescape($abstract),
             mime      => &Apache::lonnet::unescape($mime),
             lang      => &Apache::lonnet::unescape($lang),
             owner     => &Apache::lonnet::unescape($owner),
             copyright => &Apache::lonnet::unescape($copyright),
             creationdate     => &Apache::lonnet::unescape($creationdate),
             lastrevisiondate => &Apache::lonnet::unescape($lastrevisiondate)
           );
       $Fields{'language'} = 
           &Apache::loncommon::languagedescription($Fields{'lang'});
       $Fields{'copyrighttag'} =
           &Apache::loncommon::copyrightdescription($Fields{'copyright'});
       $Fields{'mimetag'} =
           &Apache::loncommon::filedescription($Fields{'mime'});
       if ($Fields{'author'}=~/^(\s*|error)$/) {
           $Fields{'author'}="Unknown Author";
       }
       # Put spaces in the keyword list, if needed.
       $Fields{'keywords'}=~ s/,([A-z])/, $1/g; 
       if ($Fields{'title'}=~ /^\s*$/ ) { 
           $Fields{'title'}='Untitled'; 
       }
       unless ($ENV{'user.adv'}) {
           $Fields{'keywords'} = '- not displayed -';
           $Fields{'notes'}    = '- not displayed -';
           $Fields{'abstract'} = '- not displayed -';
           $Fields{'subject'}  = '- not displayed -';
       }
       if (length($Fields{'abstract'})>200) {
           $Fields{'abstract'} = 
               substr($Fields{'abstract'},0,200).'...';
       }
       if (length($Fields{'keywords'})>200) {
           $Fields{'keywords'} =
               substr($Fields{'keywords'},0,200).'...';
       }
       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'
   
   =item 'form.element'
   
   =back
   
   =cut
   
   ######################################################################
   ######################################################################
   sub search_results_header {
       my ($mode,$pretty_query) = @_;
       $mode = lc($mode);
       my $title;
       if ($mode eq 'advanced') {
           $title = "Advanced Search Results";
       } elsif ($mode eq 'basic') {
           $title = "Basic Search Results";
       }
       my $result = '';
       # output beginning of search page
       $result.=<<BEGINNING;
   <html>
   <head>
   <title>$title</title>
   BEGINNING
       # conditional output of script functions dependent on the mode in
       # which the search was invoked
       if ($ENV{'form.catalogmode'} eq 'interactive'){
    if (! exists($ENV{'form.mode'}) || $ENV{'form.mode'} ne 'edit') {
               $result.=<<SCRIPT;
   <script type="text/javascript">
       function select_data(title,url) {
    changeTitle(title);
    changeURL(url);
    self.close();
       }
       function changeTitle(val) {
    if (opener.inf.document.forms.resinfo.elements.t) {
       opener.inf.document.forms.resinfo.elements.t.value=val;
    }
       }
       function changeURL(val) {
    if (opener.inf.document.forms.resinfo.elements.u) {
       opener.inf.document.forms.resinfo.elements.u.value=val;
    }
       }
   </script>
   SCRIPT
           } elsif ($ENV{'form.mode'} eq 'edit') {
               my $form = $ENV{'form.form'};
               my $element = $ENV{'form.element'};
               $result.=<<SCRIPT;
   <script type="text/javascript">
   function select_data(title,url) {
       changeURL(url);
       self.close();
   }
   function changeTitle(val) {
   }
   function changeURL(val) {
       if (window.opener.document) {
           window.opener.document.forms["$form"].elements["$element"].value=val;
       } else {
    var url = 'forms[\"$form\"].elements[\"$element\"].value';
           alert("Unable to transfer data to "+url);
       }
   }
   </script>
   SCRIPT
           }
       }
       $result.=<<SCRIPT if $ENV{'form.catalogmode'} eq 'groupsearch';
   <script type="text/javascript">
       function select_data(title,url) {
   // alert('DEBUG: Should be storing '+title+' and '+url);
       }
       function queue(val) {
    if (eval("document.forms.results.returnvalues["+val+"].checked")) {
       document.forms.results.acts.value+='1a'+val+'b';
    }
    else {
       document.forms.results.acts.value+='0a'+val+'b';
    }
       }
       function select_group() {
    window.location=
       "/adm/groupsort?mode=$ENV{'form.mode'}&catalogmode=groupsearch&acts="+
       document.forms.results.acts.value;
       }
   </script>
   SCRIPT
       $result.=<<SCRIPT;
   <script type="text/javascript">
       function displayinfo(val) {
    popwin.document.forms.popremain.sdetails.value=val;
       }
       function openhelp(val) {
    openhelpwin=open('/adm/help/searchcat.html','helpscreen',
        'scrollbars=1,width=400,height=300');
    openhelpwin.focus();
       }
       function abortsearch(val) {
    popwin.close();
       }
   </script>
   SCRIPT
       $result.=<<END;
   </head>
   <body bgcolor="#ffffff">
   <img align=right src=/adm/lonIcons/lonlogos.gif>
   <h1>$title</h1>
   END
       if ($pretty_query) {
           $result .= "<p>Search query: $pretty_query</p>";
       }
       return $result;
   }
   
   ######################################################################
   ######################################################################
   
   =pod
   
   =item &make_popwin()
   
   Returns html with javascript in it to open up the status window.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub make_popwin {
       my %rhash = @_;
       my $servernum=(keys %rhash);
       my $hcinit;
       my $grid="'<br />'+\n";
       # $sn is the server number, used ONLY to make sure we have
       # rows of 10 each.  No longer used to index images.
       my $sn=1;
       foreach my $sk (sort keys %rhash) {
    $grid.="'<a href=\"";
    $grid.="javascript:opener.displayinfo('+";
    $grid.="\"'\"+'";
    $grid.=$sk;
    my $hc;
    if ($rhash{$sk} eq 'con_lost') {
       $hc="BAD CONNECTION ";
    }
    else {
       $hc="'+\"'\"+\"+hc['$sk']+\"+\"'\"+'";
       $hcinit.="hc[\"$sk\"]=\"not yet connected...\";";
    }
    $grid.=" hitcount=".$hc;
    $grid.=" domain=".$Apache::lonnet::hostdom{$sk};
    $grid.=" IP=".$Apache::lonnet::hostip{$sk};
    # '+"'"+'">'+
    $grid.="'+\"'\"+')\">'+";
    $grid.="\n";
    $grid.="'<img border=\"0\" name=\"img_".$Apache::lonnet::hostdom{$sk}.
               '_'.$sk."\" src=\"/adm/lonIcons/srvnull.gif\" alt=\"".$sk.
                   "\" /></a>'+\n";
    $grid.="'<br />'+\n" unless $sn%10;
           $sn++;
       }
       my $result.=<<ENDPOP;
   <script type="text/javascript">
       popwin=open('','popwin','scrollbars=1,width=400,height=220');
       popwin.focus();
       popwin.document.writeln('<'+'html>');
       popwin.document.writeln('<'+'head>');
       popwin.document.writeln('<'+'script>');
       popwin.document.writeln('hc=new Array();$hcinit');
       popwin.document.writeln('<'+'/script>');
       popwin.document.writeln('<'+'/head>'+
           '<'+'body bgcolor="#FFFFFF">'+
    '<'+'image name="whirly" 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="35" name="sdetails"'+
    ' value="" />'+
    '<'+'br />'+
    ' <'+'input type="button" name="button"'+
    ' value="close this window" '+
    ' onClick="javascript:opener.abortsearch()" />'+
    ' <'+'input type="button" name="button"'+
    ' value="help" onClick="javascript:opener.openhelp()" />'+
    '<'+'/tt>'+
           '<'+'/form>'+
           '<'+'/body><'+'/html>');
       popwin.document.close();
   </script>
   ENDPOP
       return $result;
   }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item Metadata Viewing Functions
   
   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, and
   extra custom metadata to show.
   
   =over 4
   
   =item &detailed_citation_view() 
   
   =cut
   
   ######################################################################
   ######################################################################
   sub detailed_citation_view {
       my %values = @_;
       my $result=<<END;
   <h3><a href="http://$ENV{'HTTP_HOST'}$values{'url'}" 
       target='search_preview'>$values{'title'}</a></h3>
   <p>
   <b>$values{'author'}</b>, <i>$values{'owner'}</i><br />
   
   <b>Subject:       </b> $values{'subject'}<br />
   <b>Keyword(s):    </b> $values{'keywords'}<br />
   <b>Notes:         </b> $values{'notes'}<br />
   <b>MIME Type:     </b> $values{'mimetag'}<br />
   <b>Language:      </b> $values{'language'}<br />
   <b>Copyright/Distribution:</b> $values{'cprtag'}<br />
   </p>
   $values{'extrashow'}
   <p>
   $values{'shortabstract'}
   </p>
   END
       return $result;
   }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &summary_view() 
   
   =cut
   
   ######################################################################
   ######################################################################
   sub summary_view {
       my %values = @_;
       my $result=<<END;
   <a href="http://$ENV{'HTTP_HOST'}$values{'url'}" 
      target='search_preview'>$values{'author'}</a><br />
   $values{'title'}<br />
   $values{'owner'} -- $values{'lastrevisiondate'}<br />
   $values{'copyrighttag'}<br />
   $values{'extrashow'}
   </p>
   END
       return $result;
   }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &fielded_format_view() 
   
   =cut
   
   ######################################################################
   ######################################################################
   sub fielded_format_view {
       my %values = @_;
       my $result=<<END;
   <b>URL: </b> <a href="http://$ENV{'HTTP_HOST'}$values{'url'}" 
                 target='search_preview'>$values{'url'}</a>
   <br />
   <b>Title:</b> $values{'title'}<br />
   <b>Author(s):</b> $values{'author'}<br />
   <b>Subject:</b> $values{'subject'}<br />
   <b>Keyword(s):</b> $values{'keywords'}<br />
   <b>Notes:</b> $values{'notes'}<br />
   <b>MIME Type:</b> $values{'mimetag'}<br />
   <b>Language:</b> $values{'language'}<br />
   <b>Creation Date:</b> $values{'creationdate'}<br />
   <b>Last Revision Date:</b> $values{'lastrevisiondate'}<br />
   <b>Publisher/Owner:</b> $values{'owner'}<br />
   <b>Copyright/Distribution:</b> $values{'copyrighttag'}<br />
   <b>Repository Location:</b> $values{'hostname'}<br />
   <b>Abstract:</b> $values{'shortabstract'}<br />
   $values{'extrashow'}
   </p>
   END
       return $result;
   }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &xml_sgml_view() 
   
   =back 
   
   =cut
   
   ######################################################################
   ######################################################################
   sub xml_sgml_view {
       my %values = @_;
       my $result=<<END;
   <pre>
   &lt;LonCapaResource&gt;
   &lt;url&gt;$values{'url'}&lt;/url&gt;
   &lt;title&gt;$values{'title'}&lt;/title&gt;
   &lt;author&gt;$values{'author'}&lt;/author&gt;
   &lt;subject&gt;$values{'subject'}&lt;/subject&gt;
   &lt;keywords&gt;$values{'keywords'}&lt;/keywords&gt;
   &lt;notes&gt;$values{'notes'}&lt;/notes&gt;
   &lt;mimeInfo&gt;
   &lt;mime&gt;$values{'mime'}&lt;/mime&gt;
   &lt;mimetag&gt;$values{'mimetag'}&lt;/mimetag&gt;
   &lt;/mimeInfo&gt;
   &lt;languageInfo&gt;
   &lt;language&gt;$values{'lang'}&lt;/language&gt;
   &lt;languagetag&gt;$values{'language'}&lt;/languagetag&gt;
   &lt;/languageInfo&gt;
   &lt;creationdate&gt;$values{'creationdate'}&lt;/creationdate&gt;
   &lt;lastrevisiondate&gt;$values{'lastrevisiondate'}&lt;/lastrevisiondate&gt;
   &lt;owner&gt;$values{'owner'}&lt;/owner&gt;
   &lt;copyrightInfo&gt;
   &lt;copyright&gt;$values{'copyright'}&lt;/copyright&gt;
   &lt;copyrighttag&gt;$values{'copyrighttag'}&lt;/copyrighttag&gt;
   &lt;/copyrightInfo&gt;
   &lt;repositoryLocation&gt;$values{'hostname'}&lt;/repositoryLocation&gt;
   &lt;shortabstract&gt;$values{'shortabstract'}&lt;/shortabstract&gt;
   &lt;/LonCapaResource&gt;
   </pre>
   $values{'extrashow'}
   END
       return $result;
   }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &filled() see if field is filled.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub filled {
       my ($field)=@_;
       if ($field=~/\S/ && $field ne 'any') {
    return 1;
       }
       else {
    return 0;
       }
   }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &output_blank_field_error()
   
   =cut
   
   ######################################################################
   ######################################################################
   sub output_blank_field_error {
       my ($r)=@_;
       # make query information persistent to allow for subsequent revision
       my $persistent=&make_persistent(\%ENV);
   
     $r->print(<<BEGINNING);      $r->print(<<BEGINNING);
 <html>  <html>
Line 986  BEGINNING Line 2108  BEGINNING
     $r->print(<<RESULTS);      $r->print(<<RESULTS);
 </head>  </head>
 <body bgcolor="#ffffff">  <body bgcolor="#ffffff">
 <img align=right src=/adm/lonIcons/lonlogos.gif>  <img align='right' src='/adm/lonIcons/lonlogos.gif' />
   <h1>Search Catalog</h1>
   <form method="post" action="/adm/searchcat">
   $persistent
   <input type='button' value='Revise search request'
   onClick='this.form.submit();' />
   $closebutton
   <hr />
   <h3>Helpful Message</h3>
   <p>
   Incorrect search query due to blank entry fields.
   You need to fill in the relevant
   fields on the search page in order for a query to be
   processed.
   </p>
   </body>
   </html>
   RESULTS
   }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &output_date_error()
   
   Output a full html page with an error message.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub output_date_error {
       my ($r,$message)=@_;
       # make query information persistent to allow for subsequent revision
       my $persistent=&make_persistent(\%ENV);
   
       $r->print(<<RESULTS);
   <html>
   <head>
   <title>The LearningOnline Network with CAPA</title>
   </head>
   <body bgcolor="#ffffff">
   <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  $persistent
 <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>Helpful Message</h3>
 <p>  <p>
 $message  $message
Line 1003  $message Line 2169  $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 $groupsearch_db{$_};
    }
       }
   }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &popwin_js() send javascript to popwin
   
   =cut
   
   ######################################################################
   ######################################################################
   sub popwin_js {
       # Print javascript out to popwin, but make sure we dont generate
       # any javascript errors in doing so.
       my ($r,$text) = @_;
       $r->print(<<"END");
   <script type="text/javascript">
       if (! popwin.closed) {
    $text
       }
   </script>
   END
       $r->rflush();
   }
   
   ######################################################################
   ######################################################################
   
   =pod 
   
   =item &popwin_imgupdate()
   
   Send a given image (and its location) out to the browser.  Takes as 
   input $r, loncapa server id, and an icon URL.
   
   =cut
   
   ######################################################################
   ######################################################################
   sub popwin_imgupdate {
       my ($r,$server,$icon) = @_;
       &popwin_js($r,'popwin.document.img_'.$Apache::lonnet::hostdom{$server}.
                  '_'.$server.'.'.'src="/adm/lonIcons/'.$icon.'";');
   }    
   
 1;  1;
   
 __END__  __END__
   
   =pod
   
   =back 
   
   =cut
Removed from v.1.62  
changed lines
  Added in v.1.143

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