# The LearningOnline Network with CAPA
# Handler to show differences between file versions
#
# $Id: londiff.pm,v 1.8 2002/05/29 18:23:58 stredwic 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/
#
#
# (Handler to retrieve an old version of a file
#
# (Publication Handler
#
# (TeX Content Handler
#
# 05/29/00,05/30,10/11 Gerd Kortemeyer)
#
# 11/28,11/29,11/30,12/01,12/02,12/04,12/23 Gerd Kortemeyer
# 03/23 Guy Albertelli
# 03/24,03/29 Gerd Kortemeyer)
#
# 03/31,04/03 Gerd Kortemeyer)
#
# 05/02/01,05/09 Gerd Kortemeyer
# 12/13 Scott Harrison
#
###
package Apache::londiff;
use strict;
use Apache::File;
use File::Copy;
use Algorithm::Diff qw(diff);
use Apache::Constants qw(:common :http :methods);
use Apache::loncacc;
use Apache::lonnet();
use Apache::loncommon();
sub handler {
my $r=shift;
# Get query string for limited number of parameters
&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
['filename','versiontwo','versionone']);
# Get the files
my $cuname=$ENV{'user.name'};
my $cudom=$ENV{'user.domain'};
unless (($cuname,$cudom)=
&Apache::loncacc::constructaccess($ENV{'form.filename'},
$r->dir_config('lonDefDomain'))) {
$r->log_reason($cuname.' at '.$cudom.
' trying to get diffs file '.$ENV{'form.filename'}.
' - not authorized',
$r->filename);
return HTTP_NOT_ACCEPTABLE;
}
my $efn=$ENV{'form.filename'};
$efn=~s/\/\~(\w+)//g;
my @f1=();
my @f2=();
$r->content_type('text/html');
$r->send_http_header;
$r->print('LON-CAPA Construction Diffs');
$r->print('');
$r->print('Compare versions of '.$efn.'
');
if (($cuname ne $ENV{'user.name'}) || ($cudom ne $ENV{'user.domain'})) {
$r->print('Co-Author: '.$cuname.' at '.$cudom.
'
');
}
if (&Apache::loncommon::fileembstyle(($efn=~/\.(\w+)$/)) eq
'ssi') {
if ($ENV{'form.versionone'} eq 'priv') {
my $fn='/home/'.$cuname.'/public_html/'.$efn;
if (-e $fn) {
my $fh=Apache::File->new($fn);
my $line;
while($line=<$fh>) {
chomp($line);
$f1[$#f1+1]=$line;
}
}
$r->print('Construction Space Version
');
} else {
my $fn=
'/home/httpd/html//res/'.$cudom.'/'.$cuname.'/';
if ($ENV{'form.versionone'}) {
my ($main,$suffix)=($efn=~/^(.+)\.(\w+)$/);
$fn.=$main.'.'.$ENV{'form.versionone'}.'.'.$suffix;
$r->print('Version '.$ENV{'form.versionone'}.'
');
} else {
$fn.=$efn;
$r->print('Current Version
');
}
@f1=split(/\n/,&Apache::lonnet::getfile($fn));
}
$r->print('versus');
if ($ENV{'form.versiontwo'} eq 'priv') {
my $fn='/home/'.$cuname.'/public_html/'.$efn;
if (-e $fn) {
my $fh=Apache::File->new($fn);
my $line;
while($line=<$fh>) {
chomp($line);
$f2[$#f2+1]=$line;
}
}
$r->print('Construction Space Version
');
} else {
my $fn=
'/home/httpd/html/res/'.$cudom.'/'.$cuname.'/';
if ($ENV{'form.versiontwo'}) {
my ($main,$suffix)=($efn=~/^(.+)\.(\w+)$/);
$fn.=$main.'.'.$ENV{'form.versiontwo'}.'.'.$suffix;
$r->print('Version '.$ENV{'form.versiontwo'}.'
');
} else {
$fn.=$efn;
$r->print('Current Version
');
}
@f2=split(/\n/,&Apache::lonnet::getfile($fn));
}
# Run diff
my $diffs = diff(\@f1, \@f2);
# Start page output
my $chunk;
my $line;
$r->print('');
foreach $chunk (@$diffs) {
foreach $line (@$chunk) {
my ($sign, $lineno, $text) = @$line;
$text=~s/\/\>\;/g;
$lineno=substr($lineno.' ',0,7);
$r->print(''.
$sign.' '.$lineno.' '.$text."\n");
}
$r->print("
\n");
}
$r->print('');
} else {
$r->print('Binary File
');
}
$r->print('');
return OK;
}
1;
__END__