--- loncom/interface/londocs.pm	2002/10/16 20:18:19	1.30
+++ loncom/interface/londocs.pm	2002/10/18 13:47:57	1.32
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Documents
 #
-# $Id: londocs.pm,v 1.30 2002/10/16 20:18:19 www Exp $
+# $Id: londocs.pm,v 1.32 2002/10/18 13:47:57 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -311,9 +311,80 @@ sub handler {
    my %changes=&Apache::lonnet::dump
     ('versionupdate',$ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
                      $ENV{'course.'.$ENV{'request.course.id'}.'.num'});
-   foreach (keys %changes) {
-       $r->print('<br /><a href="'.$_.'" target="cat">'.$_.'</a> - '.
-                 localtime($changes{$_}));
+   my $firstkey=(keys %changes)[0];
+   unless ($firstkey=~/^error\:/) {
+       unless ($ENV{'form.timerange'}) {
+	   $ENV{'form.timerange'}=604800;
+       }
+       my $seltext='during the last '.$ENV{'form.timerange'}.' seconds';
+       my $startsel='';
+       my $monthsel='';
+       my $weeksel='';
+       my $daysel='';
+       if ($ENV{'form.timerange'}==-1) {
+	   $seltext='since start of course';
+           $startsel='selected';
+           $ENV{'form.timerange'}=time;
+       }
+       my $starttime=time-$ENV{'form.timerange'};
+       if ($ENV{'form.timerange'}==2592000) {
+           $seltext='during the last month ('.localtime($starttime).')';
+           $monthsel='selected';
+       } elsif ($ENV{'form.timerange'}==604800) {
+           $seltext='during the last week ('.localtime($starttime).')';
+           $weeksel='selected';
+       } elsif ($ENV{'form.timerange'}==86400) {
+           $seltext='since yesterday ('.localtime($starttime).')';
+           $daysel='selected';
+       }
+ 
+       $r->print(<<ENDHEADERS);
+<form action="/adm/coursedocs" method="post">
+<select name="timerange">
+<option value="-1" $startsel>Since Start of Course</option>
+<option value="2592000" $monthsel>Last Month</option>
+<option value="604800" $weeksel>Last Week</option>
+<option value="86400" $daysel>Since Yesterday</option>
+</select>
+<input type="submit" name="versions" value="Display" />
+</form>
+<h3>Content changed $seltext</h3>
+<table border="2">
+<tr>
+<th>File</th><th>Modification Date</th>
+<th>Version</th><th>Differences</th></tr>
+ENDHEADERS
+       foreach (keys %changes) {
+	  if ($changes{$_}>$starttime) {
+	     my ($root,$extension)=($_=~/^(.*)\.(\w+)$/);
+             my $currentversion=&Apache::lonnet::getversion($_);
+             my $linkurl=&Apache::lonnet::clutter($_);
+             $r->print(
+                 '<tr><td><a href="'.$linkurl.'" target="cat">'.$linkurl.
+                 '</a></td><td>'.
+                 localtime($changes{$_}).'</td><td>'.$currentversion.'</td>'.
+		       '<td>');
+             my $lastold=1;
+             for (my $prevvers=1;$prevvers<$currentversion;$prevvers++) {
+                 my $url=$root.'.'.$prevvers.'.'.$extension;
+                 if (&Apache::lonnet::metadata($url,'lastrevisiondate')<
+                                                             $starttime) {
+                     $lastold=$prevvers;
+                 }
+             }
+            for (my $prevvers=$lastold;$prevvers<$currentversion;$prevvers++) {
+                 my $url=$root.'.'.$prevvers.'.'.$extension;
+                 $r->print('<a href="'.&Apache::lonnet::clutter($url).
+                   '">Version '.$prevvers.' ('.
+                 localtime(&Apache::lonnet::metadata($url,'lastrevisiondate')).
+                 ')</a><br />');
+             }
+             $r->print('</td></tr>');
+          }
+       }
+       $r->print('</table>');
+   } else {
+       $r->print('<p>No content modifications yet.</p>');
    }
    &untiehash();
   } else {