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Add collaborator field - thanks to Gerd
Check for valid collaborators and maximum number.
However, cannot force students to change the number unless we trancate the
number.

    1: # The LearningOnline Network with CAPA
    2: # essay (ungraded) style responses
    3: #
    4: # $Id: essayresponse.pm,v 1.10 2002/07/24 16:58:08 ng Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: # 4/3 Guy
   29: # July, 2002, H. K. Ng
   30: #
   31: package Apache::essayresponse;
   32: use strict;
   33: 
   34: BEGIN {
   35:     &Apache::lonxml::register('Apache::essayresponse',('essayresponse'));
   36: }
   37: 
   38: sub start_essayresponse {
   39:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   40:     my $result;
   41: 
   42:     if ($target eq 'web') {
   43: 	my $part= $Apache::inputtags::part;
   44: 	my $id  = &Apache::response::start_response($parstack,$safeeval);
   45: 
   46: 	my $ncol= &Apache::lonnet::EXT("resource.$part".'_'."$id.maxcollaborators");
   47: 	my $coll= &HTML::Entities::encode($Apache::lonhomework::history{"resource.$part.$id.collaborators"});
   48: 	if ($ncol > 0) {
   49: 	    $result .='<br />Collaborators: <input type="text" size="70" max="80" name="HWCOL'.
   50: 		$id.'" value="'.$coll.'" /><br />'.
   51: 		'(Enter maximum '.$ncol.' collaborators using username or username@domain, e.g. '.
   52: 		'smithje or smithje@'.$ENV{'user.domain'}.'.)<br />';
   53: 	    $result .= &check_collaborators($ncol,$coll) if ($coll =~ /\w+/);
   54: 	}
   55:     }
   56:     return $result;
   57: }
   58: 
   59: sub end_essayresponse {
   60:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   61:     my $part=$Apache::inputtags::part;
   62:     my $id  = &Apache::response::start_response($parstack,$safeeval);
   63:     if ( $target eq 'grade' ) {
   64: 	if ( defined $ENV{'form.submitted'}) {
   65: 	    my $response      = $ENV{'form.HWVAL'.$id};
   66: 	    if ( $response =~ /[^\s]/) {
   67: 		$Apache::lonhomework::results{"resource.$part.$id.submission"}=$response;
   68: 		$Apache::lonhomework::results{"resource.$part.$id.awarddetail"}="SUBMITTED";
   69: 		my %previous=&Apache::response::check_for_previous($response,$part,$id);
   70: 		&Apache::response::handle_previous(\%previous,'SUBMITTED');
   71: 	    }
   72: 	}
   73:     }
   74:     my $collaborators = $ENV{'form.HWCOL'.$id};	
   75:     if ($collaborators =~ /[^\s]/) {
   76: 	my $ncol= &Apache::lonnet::EXT("resource.$part".'_'."$id.maxcollaborators");
   77: 	my ($badlist,$toomany) = &check_collaborators($ncol,$collaborators,'yes');
   78: 	$Apache::lonhomework::results{"resource.$part.$id.collaborators"}=$collaborators;
   79: 	$Apache::lonhomework::results{"resource.$part.$id.badcollaborators"}=(join(', ',@$badlist)) 
   80: 	    if (scalar(@$badlist) > 0);
   81: 	$Apache::lonhomework::results{"resource.$part.$id.toomanycollaborators"}=$$toomany 
   82: 	    if ($toomany > 0);
   83:     }
   84:     &Apache::response::end_response;
   85:     return '';
   86: }
   87: 
   88: sub check_collaborators {
   89:     my ($ncol,$coll,$retbad) = @_;
   90:     my %classlist=&Apache::lonnet::dump('classlist',
   91: 					$ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
   92: 					$ENV{'course.'.$ENV{'request.course.id'}.'.num'});
   93:     my (@badcollaborators,$result);
   94:     my (@collaborators) = split(/\,?\s+/,$coll);
   95:     foreach (@collaborators) {
   96: 	my $collaborator = $_;
   97: 	if (/@/) {
   98: 	    $collaborator =~ s/@/:/;
   99: 	} else {
  100: 	    $collaborator = $_.':'.$ENV{'user.domain'};
  101: 	}
  102: 	push @badcollaborators, $_ if (!grep /^$collaborator/i,keys %classlist);
  103:     }
  104:     
  105:     if (scalar(@badcollaborators)) {
  106: 	my $badlist = sprintf ("The following user%s invalid: ",
  107: 			       (scalar(@badcollaborators) > 1 ? 's are' : ' is'));
  108: 	$result .= '<table border="0"><tr bgcolor="#ffbbbb"><td>'.
  109: 	    $badlist.join(', ',@badcollaborators).'. Please correct.</td></tr></table>';
  110:     }
  111:     my $toomany = scalar(@collaborators) - $ncol;
  112:     if ($toomany > 0) {
  113: 	$result .= '<table border="0"><tr bgcolor="#ffbbbb"><td>'.
  114: 	    'You have too many collaborators. Please remove '.$toomany.' collaborator'.
  115: 	    ($toomany > 1 ? 's' :'').'.</td></tr></table>';
  116:     }
  117:     return (\@badcollaborators,\$toomany) if ($retbad eq 'yes');
  118:     return $result;
  119: }
  120: 
  121: 1;
  122: __END__