--- loncom/xml/lonxml.pm	2002/12/03 22:04:43	1.216
+++ loncom/xml/lonxml.pm	2002/12/06 17:49:48	1.217
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # XML Parser Module 
 #
-# $Id: lonxml.pm,v 1.216 2002/12/03 22:04:43 sakharuk Exp $
+# $Id: lonxml.pm,v 1.217 2002/12/06 17:49:48 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -101,6 +101,8 @@ use Apache::File();
 use Apache::loncommon();
 use Apache::lonfeedback();
 use Apache::lonmsg();
+use Apache::lonmenu();
+use Apache::loncacc();
 
 #==================================================   Main subroutine: xmlparse  
 #debugging control, to turn on debugging modify the correct handler
@@ -373,6 +375,18 @@ sub fontsettings() {
     return $headerstring;
 }
 
+
+##
+## switchmenu - modeled on lonmenu::switchmenu, but better. 
+## Helper function for registerurl
+##
+sub switchmenu {
+    my ($row,$col,$imgsrc,$texttop,$textbot,$action,$description)=@_;
+    return(<<ENDSMENU);
+    menu.switchbutton($row,$col,'$imgsrc','$texttop','$textbot','$action','$description');
+ENDSMENU
+}
+
 sub registerurl {
     my $forcereg=shift;
     my $target = shift;
@@ -421,6 +435,62 @@ ENDGRDS
 ENDPARM
             }
 	}
+        ###
+        ### Determine whether or not to display the 'cstr' button for this
+        ### resource
+        ###
+        my $editbutton = '';
+        if ($ENV{'user.author'}) {
+            if ($ENV{'request.role'}=~/^(ca|au)/) {
+                # Set defaults for authors
+                my ($top,$bottom) = ('con-','struct');
+                my $action = "go('/priv/".$ENV{'user.name'}."');";
+                my $cadom  = $ENV{'request.role.domain'};
+                my $caname = $ENV{'user.name'};
+                my $desc = "Enter my resource construction space";
+                # Set defaults for co-authors
+                if ($ENV{'request.role'} =~ /^ca/) { 
+                    ($cadom,$caname)=($ENV{'request.role'}=~/(\w+)\/(\w+)$/);
+                    ($top,$bottom) = ('co con-','struct');
+                    $action = 'go("/priv/'.$caname.'");';
+                    $desc = "Enter construction space as co-author";
+                }
+                # Check that we are on the correct machine
+                my $home = &Apache::lonnet::homeserver($caname,$cadom);
+                if ($home eq $Apache::lonnet::perlvar{'lonHostID'}) {
+                    $editbutton=&switchmenu
+                        (6,1,$top,,$bottom,$action,$desc);
+                }
+            }
+            ##
+            ## Determine if user can edit url.
+            ##
+            my $cfile='';
+            my $cfuname='';
+            my $cfudom='';
+            if ($ENV{'request.filename'}) {
+                my $file=&Apache::lonnet::declutter($ENV{'request.filename'});
+                $file=~s/^(\w+)\/(\w+)/\/priv\/$2/;
+                # Chech that the user has permission to edit this resource
+                ($cfuname,$cfudom)=&Apache::loncacc::constructaccess($file,$1);
+                if (defined($cfudom)) {
+                    if (&Apache::lonnet::homeserver($cfuname,$cfudom) 
+                        eq $Apache::lonnet::perlvar{'lonHostID'}) {
+                        $cfile=$file;
+                    }
+                }
+            }        
+            # Finally, turn the button on or off
+            if ($cfile) {
+                $editbutton=&switchmenu
+                    (6,1,'cstr.gif','edit','resource',
+                     'go("'.$cfile.'");',"Edit this resource");
+            } elsif ($editbutton eq '') {
+                $editbutton = '    menu.clearbut(6,1);';
+            }
+        }
+        ###
+        ###
 	$result = (<<ENDREGTHIS);
      
 <script language="JavaScript">
@@ -456,6 +526,7 @@ ENDPARM
           menu.switchbutton
                                (9,3,'anot.gif','anno-','tations','annotate()','Make notes and annotations about this resource');
           $hwkadd
+          $editbutton
     }
 
     function LONCAPAstale() {