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Does spell checking, marks wrong words red, underlines words with suggestions

# The LearningOnline Network with CAPA
# Interface routines for Aspell
#
# $Id: lonspeller.pm,v 1.2 2004/07/22 19:43:46 www Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
######################################################################
######################################################################

package Apache::lonspeller;

use Text::Aspell;
use Apache::lonlocal;
use strict;
my $speller;

sub markeduptext {
    my $input=shift;
    my $output='';
    foreach my $word (split(/\W+/,$input)) {
	if ($speller->check($word)) {
	    $output.=$word.' ';
	} else {
	    my $suggestions=join(' ',$speller->suggest($word));
	    &Apache::lonnet::logthis($suggestions);
	    $suggestions=~s/\'/\\\'/gs;
	    if ($suggestions) {
		$output.='<a href="javascript:alert('."'".
		    $suggestions."');".
		    '">';
	    }
	    $output.='<font color="red">'.$word.'</font>';
	    if ($suggestions) { $output.='</a>'; }
	    $output.=' ';
	}
    }
    return $output;
}

BEGIN {
    $speller = Text::Aspell->new;
    $speller->set_option('lang','en_US');
    $speller->set_option('sug-mode','fast');
#    $speller->set_option('mode','sgml');
}

1;

__END__