--- loncom/interface/loncoursedata.pm	2002/10/09 17:25:23	1.34
+++ loncom/interface/loncoursedata.pm	2002/10/16 13:43:34	1.36
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # (Publication Handler
 #
-# $Id: loncoursedata.pm,v 1.34 2002/10/09 17:25:23 matthew Exp $
+# $Id: loncoursedata.pm,v 1.36 2002/10/16 13:43:34 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -1387,7 +1387,93 @@ sub CheckForResidualDownload {
     return 'OK';
 }
 
+################################################
+################################################
+
+=pod
+
+=item &get_classlist();
+
+Retrieve the classist of a given class or of the current class.  Student
+information is returned from the classlist.db file and, if needed,
+from the students environment.
+
+Optional arguments are $cid, $cdom, and $cnum (course id, course domain,
+and course number, respectively).  Any omitted arguments will be taken 
+from the current environment ($ENV{'request.course.id'},
+$ENV{'course.'.$cid.'.domain'}, and $ENV{'course.'.$cid.'.num'}).
+
+Returns a reference to a hash which contains:
+ keys    '$sname:$sdom'
+ values  [$end,$start,$id,$section,$fullname]
+
+=cut
+
+################################################
+################################################
+
+sub get_classlist {
+    my ($cid,$cdom,$cnum) = @_;
+    $cid = $cid || $ENV{'request.course.id'};
+    $cdom = $cdom || $ENV{'course.'.$cid.'.domain'};
+    $cnum = $cnum || $ENV{'course.'.$cid.'.num'};
+   my $now = time;
+    #
+    my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
+    while (my ($student,$info) = each(%classlist)) {
+        return undef if ($student =~ /^(con_lost|error|no_such_host)/i);
+        my ($sname,$sdom) = split(/:/,$student);
+        my @Values = split(/:/,$info);
+        my ($end,$start,$id,$section,$fullname);
+        if (@Values > 2) {
+            ($end,$start,$id,$section,$fullname) = @Values;
+        } else { # We have to get the data ourselves
+            ($end,$start) = @Values;
+            $section = &Apache::lonnet::usection($sdom,$sname,$cid);
+            my %info=&Apache::lonnet::get('environment',
+                                          ['firstname','middlename',
+                                           'lastname','generation','id'],
+                                          $sdom, $sname);
+            my ($tmp) = keys(%info);
+            if ($tmp =~/^(con_lost|error|no_such_host)/i) {
+                $fullname = 'not available';
+                $id = 'not available';
+            } else {
+                $fullname = &ProcessFullName(@info{qw/lastname generation 
+                                                       firstname middlename/});
+                $id = $info{'id'};
+            }
+            # Update the classlist with this students information
+            if ($fullname ne 'not available') {
+                my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
+                my $reply=&Apache::lonnet::cput('classlist',
+                                                {$student => $enrolldata},
+                                                $cdom,$cnum);
+                if ($reply !~ /^(ok|delayed)/) {
+                    &Apache::lonnet::logthis('Unable to update classlist for '.
+                                             'student '.$sname.':'.$sdom.
+                                             ' error:'.$reply);
+                }
+            }
+        }
+        my $status='Expired';
+        if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
+            $status='Active';
+        }
+        $classlist{$student} = 
+            [$sdom,$sname,$end,$start,$id,$section,$fullname,$status];
+    }
+    if (wantarray()) {
+        return (\%classlist,['domain','username','end','start','id',
+                             'section','fullname','status']);
+    } else {
+        return \%classlist;
+    }
+}
+
 # ----- END HELPER FUNCTIONS --------------------------------------------
 
 1;
 __END__
+
+