--- loncom/interface/Attic/lonspreadsheet.pm	2002/11/04 22:35:45	1.132
+++ loncom/interface/Attic/lonspreadsheet.pm	2002/11/15 18:19:10	1.140
@@ -1,5 +1,5 @@
 #
-# $Id: lonspreadsheet.pm,v 1.132 2002/11/04 22:35:45 matthew Exp $
+# $Id: lonspreadsheet.pm,v 1.140 2002/11/15 18:19:10 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -53,15 +53,18 @@ built-in functions.
 package Apache::lonspreadsheet;
             
 use strict;
+use Apache::Constants qw(:common :http);
+use Apache::lonnet;
+use Apache::lonhtmlcommon;
+use Apache::loncoursedata;
+use Apache::File();
 use Safe;
 use Safe::Hole;
 use Opcode;
-use Apache::lonnet;
-use Apache::Constants qw(:common :http);
 use GDBM_File;
 use HTML::TokeParser;
-use Apache::lonhtmlcommon;
-use Apache::loncoursedata;
+use Spreadsheet::WriteExcel;
+
 #
 # Caches for coursewide information 
 #
@@ -91,7 +94,7 @@ my %spreadsheets;
 my %courserdatas;
 my %userrdatas;
 my %defaultsheets;
-my %updatedata;
+my %rowlabel_cache;
 
 #
 # These global hashes are dependent on user, course and resource, 
@@ -1083,6 +1086,44 @@ sub geterrorlog {
     return ${$sheet->{'safe'}->varglob('errorlog')};    
 }
 
+sub gettitle {
+    my $sheet = shift;
+    if ($sheet->{'sheettype'} eq 'classcalc') {
+        return $sheet->{'coursedesc'};
+    } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
+        return 'Grades for '.$sheet->{'uname'}.'@'.$sheet->{'udom'};
+    } elsif ($sheet->{'sheettype'} eq 'assesscalc') {
+        if (($sheet->{'usymb'} eq '_feedback') ||
+            ($sheet->{'usymb'} eq '_evaluation') ||
+            ($sheet->{'usymb'} eq '_discussion') ||
+            ($sheet->{'usymb'} eq '_tutoring')) {
+            my $title = $sheet->{'usymb'};
+            $title =~ s/^_//;
+            $title = ucfirst($title);
+            return $title;
+        }
+        return if (! defined($sheet->{'mapid'}) || 
+                   $sheet->{'mapid'} !~ /^\d+$/);
+        my $mapid = $sheet->{'mapid'};
+        return if (! defined($sheet->{'resid'}) || 
+                   $sheet->{'resid'} !~ /^\d+$/);
+        my $resid = $sheet->{'resid'};
+        my %course_db;
+        tie(%course_db,'GDBM_File',$sheet->{'coursefilename'}.'.db',
+            &GDBM_READER(),0640);
+        return if (! tied(%course_db));
+        my $key = 'title_'.$mapid.'.'.$resid;
+        my $title = '';
+        if (exists($course_db{$key})) {
+            $title = $course_db{$key};
+        } else {
+            $title = $sheet->{'usymb'};
+        }
+        untie (%course_db);
+        return $title;
+    }
+}
+
 # ----------------------------------------------------- Get value of $f{'A'.$n}
 sub getfa {
     my $sheet = shift;
@@ -1105,11 +1146,26 @@ sub exportdata {
     return @exportarray;
 }
 
+
+
+sub update_student_sheet{
+    my ($sheet,$c) = @_;
+    # Load in the studentcalc sheet
+    &readsheet($sheet,'default_studentcalc');
+    # Determine the structure (contained assessments, etc) of the sheet
+    &updatesheet($sheet);
+    # Load in the cached sheets for this student
+    &cachedssheets($sheet);
+    # Load in the (possibly cached) data from the assessment sheets        
+    &loadstudent($sheet,$c);
+    # Compute the sheet
+    &calcsheet($sheet);
+}
+
 # ========================================================== End of Spreadsheet
 # =============================================================================
-
 #
-# Procedures for screen output
+# Procedures for spreadsheet output
 #
 # --------------------------------------------- Produce output row n from sheet
 
@@ -1135,6 +1191,7 @@ sub sort_indicies {
     #
     my @sortby=();
     my @sortidx=();
+    # Skip row 0
     for (my $row=1;$row<=$sheet->{'maxrow'};$row++) {
         push (@sortby, $sheet->{'safe'}->reval('$f{"A'.$row.'"}'));
         push (@sortidx, $row);
@@ -1143,17 +1200,18 @@ sub sort_indicies {
     return @sortidx;
 }
 
-########################################################################
-########################################################################
-
+#############################################################
+###                                                       ###
+###              Spreadsheet Output Routines              ###
+###                                                       ###
+#############################################################
+
+############################################
+##         HTML output routines           ##
+############################################
 sub html_editable_cell {
     my ($cell,$bgcolor) = @_;
     my $result;
-#    if (defined($cell)) {
-#        &Apache::lonnet::logthis("cell ".$cell->{'name'}.
-#                                 " = ".$cell->{'value'}.
-#                                 " : ".$cell->{'formula'});
-#    }
     my ($name,$formula,$value);
     if (defined($cell)) {
         $name    = $cell->{'name'};
@@ -1168,7 +1226,10 @@ sub html_editable_cell {
             $value = '<i>undefined value</i>';
         }
     }
-    #
+    if ($value =~ /^\s*$/ ) {
+        $value = '<font color="'.$bgcolor.'">#</font>';
+    }
+    $formula =~ s/\n/\\n/gs;
     $result .= '<a href="javascript:celledit(\''.
         $name.'\',\''.$formula.'\');">'.$value.'</a>';
     return $result;
@@ -1180,9 +1241,6 @@ sub html_uneditable_cell {
     return '&nbsp;'.$value.'&nbsp;';
 }
 
-########################################################################
-########################################################################
-
 sub outsheet_html  {
     my ($sheet,$r) = @_;
     my ($num_uneditable,$realm,$row_type);
@@ -1231,7 +1289,7 @@ END
     # Print out template row
     ####################################
     my ($rowlabel,@rowdata) = &get_row($sheet,'-');
-    my $row_html = '<tr><td>'.&format_rowlabel($rowlabel).'</td>';
+    my $row_html = '<tr><td>'.&format_html_rowlabel($rowlabel).'</td>';
     my $num_cols_output = 0;
     foreach my $cell (@rowdata) {
         if ($num_cols_output++ < $num_uneditable) {
@@ -1249,8 +1307,7 @@ END
     # Print out summary/export row
     ####################################
     my ($rowlabel,@rowdata) = &get_row($sheet,'0');
-    my $rowcount = 0;
-    $row_html = '<tr><td>'.&format_rowlabel($rowlabel).'</td>';
+    $row_html = '<tr><td>'.&format_html_rowlabel($rowlabel).'</td>';
     $num_cols_output = 0;
     foreach my $cell (@rowdata) {
         if ($num_cols_output++ < 26) {
@@ -1274,6 +1331,7 @@ END
     my $rows_output=0;
     foreach my $rownum (@Rows) {
         my ($rowlabel,@rowdata) = &get_row($sheet,$rownum);
+        next if ($rowlabel =~ /^\s*$/);
         #
         my $defaultbg='#E0FF';
         #
@@ -1281,11 +1339,11 @@ END
             '</font></b></td>';
         #
         if ($sheet->{'sheettype'} eq 'classcalc') {
-            $row_html.='<td>'.&format_rowlabel($rowlabel).'</td>';
+            $row_html.='<td>'.&format_html_rowlabel($rowlabel).'</td>';
             # Output links for each student?
-            # Nope, that is already done for us in format_rowlabel (for now)
+            # Nope, that is already done for us in format_html_rowlabel (for now)
         } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
-            $row_html.='<td>'.&format_rowlabel($rowlabel);
+            $row_html.='<td>'.&format_html_rowlabel($rowlabel);
             $row_html.= '<br>'.
                 '<select name="sel_'.$rownum.'" '.
                     'onChange="changesheet('.$rownum.')">'.
@@ -1299,7 +1357,7 @@ END
             }
             $row_html.='</select></td>';
         } elsif ($sheet->{'sheettype'} eq 'assesscalc') {
-            $row_html.='<td>'.&format_rowlabel($rowlabel).'</td>';
+            $row_html.='<td>'.&format_html_rowlabel($rowlabel).'</td>';
         }
         #
         my $shown_cells = 0;
@@ -1352,30 +1410,252 @@ END
     return 1;
 }
 
+############################################
+##         csv output routines            ##
+############################################
 sub outsheet_csv   {
     my ($sheet,$r) = @_;
+    my $csvdata = '';
+    my @Values;
+    ####################################
+    # Prepare to output rows
+    ####################################
+    my @Rows = &sort_indicies($sheet);
+    #
+    # Loop through the rows and output them one at a time
+    my $rows_output=0;
+    foreach my $rownum (@Rows) {
+        my ($rowlabel,@rowdata) = &get_row($sheet,$rownum);
+        next if ($rowlabel =~ /^\s*$/);
+        push (@Values,&format_csv_rowlabel($rowlabel));
+        foreach my $cell (@rowdata) {
+            push (@Values,'"'.$cell->{'value'}.'"');
+        }
+        $csvdata.= join(',',@Values)."\n";
+        @Values = ();
+    }
+    #
+    # Write the CSV data to a file and serve up a link
+    #
+    my $filename = '/prtspool/'.
+        $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
+        time.'_'.rand(1000000000).'.csv';
+    my $file;
+    unless ($file = Apache::File->new('>'.'/home/httpd'.$filename)) {
+        $r->log_error("Couldn't open $filename for output $!");
+        $r->print("Problems occured in writing the csv file.  ".
+                  "This error has been logged.  ".
+                  "Please alert your LON-CAPA administrator.");
+        $r->print("<pre>\n".$csvdata."</pre>\n");
+        return 0;
+    }
+    print $file $csvdata;
+    close($file);
+    $r->print('<br /><br />'.
+              '<a href="'.$filename.'">Your CSV spreadsheet.</a>'."\n");
+    #
+    return 1;
+}
+
+############################################
+##        Excel output routines           ##
+############################################
+sub outsheet_recursive_excel {
+    my ($sheet,$r) = @_;
+    my $c = $r->connection;
+    return undef if ($sheet->{'sheettype'} ne 'classcalc');
+    my ($workbook,$filename) = &create_excel_spreadsheet($sheet,$r);
+    return undef if (! defined($workbook));
+    #
+    # Create main worksheet
+    my $main_worksheet = $workbook->addworksheet('main');
+    #
+    # Figure out who the students are
+    my %f=&getformulas($sheet);
+    my $count = 0;
+    $r->print(<<END);
+<p>
+Compiling Excel Workbook with a worksheet for each student.
+</p><p>
+This operation may take longer than a complete recalculation of the
+spreadsheet. 
+</p><p>
+To abort this operation, hit the stop button on your browser.
+</p><p>
+A link to the spreadsheet will be available at the end of this process.
+</p>
+<p>
+END
+    $r->rflush();
+    my $starttime = time;
+    foreach (keys(%f)) {
+	next if ($_!~/^A(\d+)/ || $1 == 0 || ($f{$_}=~/^[!~-]/));
+        $count++;
+        my ($sname,$sdom) = split(':',$f{$_});
+        my $student_excel_worksheet=$workbook->addworksheet($sname.'@'.$sdom);
+        # Create a new spreadsheet
+        my $studentsheet = &makenewsheet($sname,$sdom,'studentcalc',undef);
+        # Read in the spreadsheet definition
+        &update_student_sheet($studentsheet,$c);
+        # Stuff the sheet into excel
+        &export_sheet_as_excel($studentsheet,$student_excel_worksheet);
+        my $totaltime = int((time - $starttime) / $count * $sheet->{'maxrow'});
+        my $timeleft = int((time - $starttime) / $count * ($sheet->{'maxrow'} - $count));
+        if ($count % 5 == 0) {
+            $r->print($count.' students completed.'.
+                      '  Time remaining: '.$timeleft.' sec. '.
+                      '  Estimated total time: '.$totaltime." sec <br />\n");
+            $r->rflush();
+        }
+        if(defined($c) && ($c->aborted())) {
+            last;
+        }
+    }
+    #
+    if(! $c->aborted() ) {
+        $r->print('All students spreadsheets completed!<br />');
+        $r->rflush();
+        #
+        # &export_sheet_as_excel fills $worksheet with the data from $sheet
+        &export_sheet_as_excel($sheet,$main_worksheet);
+        #
+        $workbook->close();
+        # Okay, the spreadsheet is taken care of, so give the user a link.
+        $r->print('<br /><br />'.
+                  '<a href="'.$filename.'">Your Excel spreadsheet.</a>'."\n");
+    } else {
+        $workbook->close();  # Not sure how necessary this is.
+        #unlink('/home/httpd'.$filename); # No need to keep this around?
+    }
+    return 1;
 }
 
 sub outsheet_excel {
     my ($sheet,$r) = @_;
+    my ($workbook,$filename) = &create_excel_spreadsheet($sheet,$r);
+    return undef if (! defined($workbook));
+    my $sheetname;
+    if ($sheet->{'sheettype'} eq 'classcalc') {
+        $sheetname = 'Main';
+    } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
+        $sheetname = $sheet->{'uname'}.'@'.$sheet->{'udom'};
+    } elsif ($sheet->{'sheettype'} eq 'assesscalc') {
+        $sheetname = $sheet->{'uname'}.'@'.$sheet->{'udom'}.' assessment';
+    }
+    my $worksheet = $workbook->addworksheet($sheetname);
+    #
+    # &export_sheet_as_excel fills $worksheet with the data from $sheet
+    &export_sheet_as_excel($sheet,$worksheet);
+    #
+    $workbook->close();
+    # Okay, the spreadsheet is taken care of, so give the user a link.
+    $r->print('<br /><br />'.
+              '<a href="'.$filename.'">Your Excel spreadsheet.</a>'."\n");
+    return 1;
+}
+
+sub create_excel_spreadsheet {
+    my ($sheet,$r) = @_;
+    my $filename = '/prtspool/'.
+        $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
+        time.'_'.rand(1000000000).'.xls';
+    my $workbook  = Spreadsheet::WriteExcel->new('/home/httpd'.$filename);
+    if (! defined($workbook)) {
+        $r->log_error("Error creating excel spreadsheet $filename: $!");
+        $r->print("Problems creating new Excel file.  ".
+                  "This error has been logged.  ".
+                  "Please alert your LON-CAPA administrator");
+        return undef;
+    }
+    #
+    # The spreadsheet stores temporary data in files, then put them
+    # together.  If needed we should be able to disable this (memory only).
+    # The temporary directory must be specified before calling 'addworksheet'.
+    # File::Temp is used to determine the temporary directory.
+    $workbook->set_tempdir('/home/httpd/perl/tmp');
+    #
+    # Determine the name to give the worksheet
+    return ($workbook,$filename);
+}
+
+sub export_sheet_as_excel {
+    my $sheet = shift;
+    my $worksheet = shift;
+    #
+    my $rows_output = 0;
+    my $cols_output = 0;
+    ####################################
+    #    Write an identifying row      #
+    ####################################
+    my @Headerinfo = ($sheet->{'coursedesc'});
+    my $title = &gettitle($sheet);
+    $cols_output = 0;    
+    if (defined($title)) {
+        $worksheet->write($rows_output++,$cols_output++,$title);
+    }
+    ####################################
+    #   Write the summary/export row   #
+    ####################################
+    my ($rowlabel,@rowdata) = &get_row($sheet,'0');
+    my $label = &format_excel_rowlabel($rowlabel);
+    $cols_output = 0;
+    $worksheet->write($rows_output,$cols_output++,$label);
+    foreach my $cell (@rowdata) {
+        $worksheet->write($rows_output,$cols_output++,$cell->{'value'});
+    }
+    $rows_output+= 2;   # Skip a row, just for fun
+    ####################################
+    # Prepare to output rows
+    ####################################
+    my @Rows = &sort_indicies($sheet);
+    #
+    # Loop through the rows and output them one at a time
+    foreach my $rownum (@Rows) {
+        my ($rowlabel,@rowdata) = &get_row($sheet,$rownum);
+        next if ($rowlabel =~ /^\s*$/);
+        $cols_output = 0;
+        my $label = &format_excel_rowlabel($rowlabel);
+        $worksheet->write($rows_output,$cols_output++,$label);
+        if (ref($label)) {
+            $cols_output = (scalar(@$label));
+        }
+        foreach my $cell (@rowdata) {
+            $worksheet->write($rows_output,$cols_output++,$cell->{'value'});
+        }
+        $rows_output++;
+    }
+    return;
 }
 
+############################################
+##          XML output routines           ##
+############################################
 sub outsheet_xml   {
     my ($sheet,$r) = @_;
+    ## Someday XML
+    ## Will be rendered for the user
+    ## But not on this day
 }
 
+##
+## Outsheet - calls other outsheet_* functions
+##
 sub outsheet {
     my ($r,$sheet)=@_;
-    &outsheet_html($sheet,$r);
-#    if (exists($ENV{'form.csv'})) {
-#        &outsheet_csv($sheet,$r);
-#    } elsif (exists($ENV{'form.excel'})) {
-#        &outsheet_excel($sheet,$r);
-#    } elsif (exists($ENV{'form.xml'})) {
+    if (! exists($ENV{'form.output'})) {
+        $ENV{'form.output'} = 'HTML';
+    }
+    if (lc($ENV{'form.output'}) eq 'csv') {
+        &outsheet_csv($sheet,$r);
+    } elsif (lc($ENV{'form.output'}) eq 'excel') {
+        &outsheet_excel($sheet,$r);
+    } elsif (lc($ENV{'form.output'}) eq 'recursive excel') {
+        &outsheet_recursive_excel($sheet,$r);
+#    } elsif (lc($ENV{'form.output'}) eq 'xml' ) {
 #        &outsheet_xml($sheet,$r);
-#    } else {
-#        &outsheet_html($sheet,$r);
-#    }
+    } else {
+        &outsheet_html($sheet,$r);
+    }
 }
 
 ########################################################################
@@ -1509,12 +1789,16 @@ sub makenewsheet {
     $sheet->{'udom'}  = $udom;
     $sheet->{'sheettype'} = $stype;
     $sheet->{'usymb'} = $usymb;
+    $sheet->{'mapid'} = $ENV{'form.mapid'};
+    $sheet->{'resid'} = $ENV{'form.resid'};
     $sheet->{'cid'}   = $ENV{'request.course.id'};
     $sheet->{'csec'}  = $Section{$uname.':'.$udom};
     $sheet->{'coursefilename'}   = $ENV{'request.course.fn'};
     $sheet->{'cnum'}  = $ENV{'course.'.$ENV{'request.course.id'}.'.num'};
     $sheet->{'cdom'}  = $ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
     $sheet->{'chome'} = $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
+    $sheet->{'coursedesc'} = $ENV{'course.'.$ENV{'request.course.id'}.
+                                      '.description'};
     $sheet->{'uhome'} = &Apache::lonnet::homeserver($uname,$udom);
     #
     #
@@ -1710,41 +1994,75 @@ sub parmval {
     return &Apache::lonnet::metadata($fn,$rwhat.'.default');
 }
 
-sub format_rowlabel {
+
+##################################################################
+##                  Row label formatting routines               ##
+##################################################################
+sub format_html_rowlabel {
     my $rowlabel = shift;
     return '' if ($rowlabel eq '');
     my ($type,$labeldata) = split(':',$rowlabel,2);
     my $result = '';
     if ($type eq 'symb') {
-        my ($symb,$uname,$udom,$title) = split(':',$labeldata);
+        my ($symb,$uname,$udom,$mapid,$resid,$title) = split(':',$labeldata);
         $symb = &Apache::lonnet::unescape($symb);
-        if ($ENV{'form.showcsv'}) {
-            $result = $title;
-        } else {
-            $result = '<a href="/adm/assesscalc?usymb='.$symb.
-                '&uname='.$uname.'&udom='.$udom.'">'.$title.'</a>';
-        }
+        $result = '<a href="/adm/assesscalc?usymb='.$symb.
+            '&uname='.$uname.'&udom='.$udom.
+                '&mapid='.$mapid.'&resid='.$resid.'">'.$title.'</a>';
     } elsif ($type eq 'student') {
         my ($sname,$sdom,$fullname,$section,$id) = split(':',$labeldata);
-        if ($ENV{'form.showcsv'}) {
-            $result = '"'.
-                join('","',($sname,$sdom,$fullname,$section,$id).'"');
-        } else {
-            $result ='<a href="/adm/studentcalc?uname='.$sname.
-                '&udom='.$sdom.'">';
-            $result.=$section.'&nbsp;'.$id."&nbsp;".$fullname.'</a>';
-        }
+        $result ='<a href="/adm/studentcalc?uname='.$sname.
+            '&udom='.$sdom.'">';
+        $result.=$section.'&nbsp;'.$id."&nbsp;".$fullname.'</a>';
     } elsif ($type eq 'parameter') {
-        if ($ENV{'form.showcsv'}) {
-            $labeldata =~ s/<br>/ /g;
-        }
         $result = $labeldata;
     } else {
-        if ($ENV{'form.showcsv'}) {
-            $result = $rowlabel;
-        } else {
-            $result = '<b><font size=+1>'.$rowlabel.'</font></b>';
-        }
+        $result = '<b><font size=+1>'.$rowlabel.'</font></b>';
+    }
+    return $result;
+}
+
+sub format_csv_rowlabel {
+    my $rowlabel = shift;
+    return '' if ($rowlabel eq '');
+    my ($type,$labeldata) = split(':',$rowlabel,2);
+    my $result = '';
+    if ($type eq 'symb') {
+        my ($symb,$uname,$udom,$mapid,$resid,$title) = split(':',$labeldata);
+        $symb = &Apache::lonnet::unescape($symb);
+        $result = $title;
+    } elsif ($type eq 'student') {
+        my ($sname,$sdom,$fullname,$section,$id) = split(':',$labeldata);
+        $result = join('","',($sname,$sdom,$fullname,$section,$id));
+    } elsif ($type eq 'parameter') {
+        $labeldata =~ s/<br>/ /g;
+        $result = $labeldata;
+    } else {
+        $result = $rowlabel;
+    }
+    return '"'.$result.'"';
+}
+
+sub format_excel_rowlabel {
+    my $rowlabel = shift;
+    return '' if ($rowlabel eq '');
+    my ($type,$labeldata) = split(':',$rowlabel,2);
+    my $result = '';
+    if ($type eq 'symb') {
+        my ($symb,$uname,$udom,$mapid,$resid,$title) = split(':',$labeldata);
+        $symb = &Apache::lonnet::unescape($symb);
+        $result = $title;
+    } elsif ($type eq 'student') {
+        my ($sname,$sdom,$fullname,$section,$id) = split(':',$labeldata);
+        $section = '' if (! defined($section));
+        $id      = '' if (! defined($id));
+        my @Data = ($sname,$sdom,$fullname,$section,$id);
+        $result = \@Data;
+    } elsif ($type eq 'parameter') {
+        $labeldata =~ s/<br>/ /g;
+        $result = $labeldata;
+    } else {
+        $result = $rowlabel;
     }
     return $result;
 }
@@ -1758,7 +2076,6 @@ sub updateclasssheet {
     my $chome =$sheet->{'chome'};
     #
     %Section = ();
-
     #
     # Read class list and row labels
     my $classlist = &Apache::loncoursedata::get_classlist();
@@ -1770,6 +2087,7 @@ sub updateclasssheet {
     foreach my $student (keys(%$classlist)) {
         my ($studentDomain,$studentName,$end,$start,$id,$studentSection,
             $fullname,$status)   =   @{$classlist->{$student}};
+        $Section{$studentName.':'.$studentDomain} = $studentSection;
         if ($ENV{'form.Status'} eq $status || $ENV{'form.Status'} eq 'Any') {
             $currentlist{$student}=join(':',('student',$studentName,
                                              $studentDomain,$fullname,
@@ -1817,29 +2135,81 @@ sub updateclasssheet {
 }
 
 # ----------------------------------- Update rows for student and assess sheets
-sub updatestudentassesssheet {
+sub get_student_rowlabels {
     my ($sheet) = @_;
     #
-    my %bighash;
+    my %course_db;
     #
     my $stype = $sheet->{'sheettype'};
     my $uname = $sheet->{'uname'};
     my $udom  = $sheet->{'udom'};
+    #
     $sheet->{'rowlabel'} = {};
-    my $identifier =$sheet->{'coursefilename'}.'_'.$stype.'_'.$uname.'_'.$udom;
-    if  ($updatedata{$identifier}) {
-        %{$sheet->{'rowlabel'}}=split(/___;___/,$updatedata{$identifier});
+    #
+    my $identifier =$sheet->{'coursefilename'}.'_'.$stype;
+    if  ($rowlabel_cache{$identifier}) {
+        %{$sheet->{'rowlabel'}}=split(/___;___/,$rowlabel_cache{$identifier});
     } else {
+        # Get the data and store it in the cache
         # Tie hash
-        tie(%bighash,'GDBM_File',$sheet->{'coursefilename'}.'.db',
+        tie(%course_db,'GDBM_File',$sheet->{'coursefilename'}.'.db',
             &GDBM_READER(),0640);
-        if (! tied(%bighash)) {
+        if (! tied(%course_db)) {
+            return 'Could not access course data';
+        }
+        #
+        my %assesslist;
+        foreach ('Feedback','Evaluation','Tutoring','Discussion') {
+            my $symb = '_'.lc($_);
+            $assesslist{$symb} = join(':',('symb',$symb,$uname,$udom,0,0,$_));
+        }
+        #
+        while (my ($key,$srcf) = each(%course_db)) {
+            next if ($key !~ /^src_(\d+)\.(\d+)$/);
+            my $mapid = $1;
+            my $resid = $2;
+            my $id   = $mapid.'.'.$resid;
+            if ($srcf=~/\.(problem|exam|quiz|assess|survey|form)$/) {
+                my $symb=
+                    &Apache::lonnet::declutter($course_db{'map_id_'.$mapid}).
+                        '___'.$resid.'___'.&Apache::lonnet::declutter($srcf);
+                $assesslist{$symb}='symb:'.&Apache::lonnet::escape($symb).':'
+                    .$uname.':'.$udom.':'.$mapid.':'.$resid.':'.
+                        $course_db{'title_'.$id};
+            }
+        }
+        untie(%course_db);
+        # Store away the data
+        $sheet->{'rowlabel'} = \%assesslist;
+        $rowlabel_cache{$identifier}=join('___;___',%{$sheet->{'rowlabel'}});
+    }
+
+}
+
+sub get_assess_rowlabels {
+    my ($sheet) = @_;
+    #
+    my %course_db;
+    #
+    my $stype = $sheet->{'sheettype'};
+    my $uname = $sheet->{'uname'};
+    my $udom  = $sheet->{'udom'};
+    my $usymb = $sheet->{'usymb'};
+    #
+    $sheet->{'rowlabel'} = {};
+    my $identifier =$sheet->{'coursefilename'}.'_'.$stype.'_'.$usymb;
+    #
+    if  ($rowlabel_cache{$identifier}) {
+        %{$sheet->{'rowlabel'}}=split(/___;___/,$rowlabel_cache{$identifier});
+    } else {
+        # Get the data and store it in the cache
+        # Tie hash
+        tie(%course_db,'GDBM_File',$sheet->{'coursefilename'}.'.db',
+            &GDBM_READER(),0640);
+        if (! tied(%course_db)) {
             return 'Could not access course data';
         }
-        # Get all assessments
         #
-        # parameter_labels is used in the assessment sheets to provide labels
-        # for the parameters.
         my %parameter_labels=
             ('timestamp' => 
                  'parameter:Timestamp of Last Transaction<br>timestamp',
@@ -1849,29 +2219,16 @@ sub updatestudentassesssheet {
                  'parameter:Number of Tutor Responses<br>tutornumber',
              'totalpoints' =>
                  'parameter:Total Points Granted<br>totalpoints');
-        #
-        # assesslist holds the descriptions of all assessments
-        my %assesslist;
-        foreach ('Feedback','Evaluation','Tutoring','Discussion') {
-            my $symb = '_'.lc($_);
-            $assesslist{$symb} = join(':',('symb',$symb,$uname,$udom,$_));
-        }
-        while (($_,undef) = each(%bighash)) {
-            next if ($_!~/^src\_(\d+)\.(\d+)$/);
-            my $mapid=$1;
-            my $resid=$2;
-            my $id=$mapid.'.'.$resid;
-            my $srcf=$bighash{$_};
+        while (my ($key,$srcf) = each(%course_db)) {
+            next if ($key !~ /^src_(\d+)\.(\d+)$/);
+            my $mapid = $1;
+            my $resid = $2;
+            my $id   = $mapid.'.'.$resid;
             if ($srcf=~/\.(problem|exam|quiz|assess|survey|form)$/) {
-                my $symb=
-                    &Apache::lonnet::declutter($bighash{'map_id_'.$mapid}).
-                        '___'.$resid.'___'.&Apache::lonnet::declutter($srcf);
-                $assesslist{$symb}='symb:'.&Apache::lonnet::escape($symb).':'
-                    .$uname.':'.$udom.':'.$bighash{'title_'.$id};
-                next if ($stype ne 'assesscalc');
-                foreach my $key (split(/\,/,
-                                       &Apache::lonnet::metadata($srcf,'keys')
-                                       )) {
+                # Loop through the metadata for this key
+                my @Metadata = split(/,/,
+                                     &Apache::lonnet::metadata($srcf,'keys'));
+                foreach my $key (@Metadata) {
                     next if ($key !~ /^(stores|parameter)_/);
                     my $display=
                         &Apache::lonnet::metadata($srcf,$key.'.display');
@@ -1883,46 +2240,43 @@ sub updatestudentassesssheet {
                     $parameter_labels{$key}='parameter:'.$display;
                 } # end of foreach
             }
-        } # end of foreach (keys(%bighash))
-        untie(%bighash);
-        #
-        # %parameter_labels has a list of storage and parameter displays by 
-        # unikey
-        # %assesslist has a list of all resource, by symb
-        #
-        if ($stype eq 'assesscalc') {
-            $sheet->{'rowlabel'} = \%parameter_labels;
-        } elsif ($stype eq 'studentcalc') {
-            $sheet->{'rowlabel'} = \%assesslist;
-        }
-        $updatedata{$sheet->{'coursefilename'}.'_'.$stype.'_'
-                        .$uname.'_'.$udom}=
-                            join('___;___',%{$sheet->{'rowlabel'}});
-        # Get current from cache
+        }
+        untie(%course_db);
+        # Store away the results
+        $sheet->{'rowlabel'} = \%parameter_labels;
+        $rowlabel_cache{$identifier}=join('___;___',%{$sheet->{'rowlabel'}});
     }
-    # Find discrepancies between the course row table and this
-    #
+        
+}
+
+sub updatestudentassesssheet {
+    my $sheet = shift;
+    if ($sheet->{'sheettype'} eq 'studentcalc') {
+        &get_student_rowlabels($sheet);
+    } else {
+        &get_assess_rowlabels($sheet);
+    }
+    # Determine if any of the information has changed
     my %f=&getformulas($sheet);
     my $changed=0;
     
     $sheet->{'maxrow'} = 0;
     my %existing=();
     # Now obsolete rows
-    foreach (keys(%f)) {
-        next if ($_!~/^A(\d+)/);
-        if ($1 > $sheet->{'maxrow'}) {
-            $sheet->{'maxrow'} = $1;
-        }
-        my ($usy,$ufn)=split(/__&&&\__/,$f{$_});
+    while (my ($cell, $formula) = each (%f)) {
+        next if ($cell !~ /^A(\d+)/);
+        $sheet->{'maxrow'} = $1 if ($1 > $sheet->{'maxrow'});
+        my ($usy,$ufn)=split(/__&&&\__/,$formula);
         $existing{$usy}=1;
         unless ((exists($sheet->{'rowlabel'}->{$usy}) && 
                  (defined($sheet->{'rowlabel'}->{$usy})) || (!$1) ||
-                ($f{$_}=~/^(~~~|---)/))){
+                 ($formula =~ /^(~~~|---)/) )) {
             $f{$_}='!!! Obsolete';
             $changed=1;
         } elsif ($ufn) {
+            # I do not think this works any more
             $sheet->{'rowlabel'}->{$usy}
-                =~s/assesscalc\?usymb\=/assesscalc\?ufn\=$ufn\&usymb\=/;
+                =~s/assesscalc\?usymb\=/assesscalc\?ufn\=$ufn&\usymb\=/;
         }
     }
     # New and unknown keys
@@ -1937,16 +2291,14 @@ sub updatestudentassesssheet {
         $sheet->{'f'} = \%f;
         &setformulas($sheet); 
     }
-    #
-    undef %existing;
 }
 
 # ------------------------------------------------ Load data for one assessment
 
-sub loadstudent {
-    my ($sheet)=@_;
-    my %c=();
-    my %f=&getformulas($sheet);
+sub loadstudent{
+    my ($sheet,$r,$c)=@_;
+    my %constants=();
+    my %formulas=&getformulas($sheet);
     $cachedassess=$sheet->{'uname'}.':'.$sheet->{'udom'};
     # Get ALL the student preformance data
     my @tmp = &Apache::lonnet::dump($sheet->{'cid'},
@@ -1959,26 +2311,29 @@ sub loadstudent {
     undef @tmp;
     # 
     my @assessdata=();
-    foreach (keys(%f)) {
-	next if ($_!~/^A(\d+)/);
+    while (my ($cell,$value) = each (%formulas)) {
+        if(defined($c) && ($c->aborted())) {
+            last;
+        }
+	next if ($cell !~ /^A(\d+)/);
         my $row=$1;
-        next if (($f{$_}=~/^[\!\~\-]/) || ($row==0));
-        my ($usy,$ufn)=split(/__&&&\__/,$f{$_});
+        next if (($value =~ /^[!~-]/) || ($row==0));
+        my ($usy,$ufn)=split(/__&&&\__/,$value);
         @assessdata=&exportsheet($sheet,$sheet->{'uname'},
                                  $sheet->{'udom'},
-                                 'assesscalc',$usy,$ufn);
+                                 'assesscalc',$usy,$ufn,$r);
         my $index=0;
         foreach ('A','B','C','D','E','F','G','H','I','J','K','L','M',
                  'N','O','P','Q','R','S','T','U','V','W','X','Y','Z') {
-            if ($assessdata[$index]) {
+            if (defined($assessdata[$index])) {
                 my $col=$_;
                 if ($assessdata[$index]=~/\D/) {
-                    $c{$col.$row}="'".$assessdata[$index]."'";
+                    $constants{$col.$row}="'".$assessdata[$index]."'";
                 } else {
-                    $c{$col.$row}=$assessdata[$index];
+                    $constants{$col.$row}=$assessdata[$index];
                 }
                 unless ($col eq 'A') { 
-                    $f{$col.$row}='import';
+                    $formulas{$col.$row}='import';
                 }
             }
             $index++;
@@ -1986,21 +2341,23 @@ sub loadstudent {
     }
     $cachedassess='';
     undef %cachedstores;
-    $sheet->{'f'} = \%f;
+    $sheet->{'f'} = \%formulas;
     &setformulas($sheet);
-    &setconstants($sheet,\%c);
+    &setconstants($sheet,\%constants);
 }
 
 # --------------------------------------------------- Load data for one student
 #
 sub loadcourse {
-    my ($sheet,$r)=@_;
-    my %c=();
-    my %f=&getformulas($sheet);
+    my ($sheet,$r,$c)=@_;
+    #
+    my %constants=();
+    my %formulas=&getformulas($sheet);
+    #
     my $total=0;
-    foreach (keys(%f)) {
+    foreach (keys(%formulas)) {
 	if ($_=~/^A(\d+)/) {
-	    unless ($f{$_}=~/^[\!\~\-]/) { $total++; }
+	    unless ($formulas{$_}=~/^[\!\~\-]/) { $total++; }
         }
     }
     my $now=0;
@@ -2017,12 +2374,16 @@ sub loadcourse {
 </script>
 ENDPOP
     $r->rflush();
-    foreach (keys(%f)) {
+    foreach (keys(%formulas)) {
+        if(defined($c) && ($c->aborted())) {
+            last;
+        }
 	next if ($_!~/^A(\d+)/);
         my $row=$1;
-        next if (($f{$_}=~/^[\!\~\-]/)  || ($row==0));
-        my ($sname,$sdom) = split(':',$f{$_});
-        my @studentdata=&exportsheet($sheet,$sname,$sdom,'studentcalc');
+        next if (($formulas{$_}=~/^[\!\~\-]/)  || ($row==0));
+        my ($sname,$sdom) = split(':',$formulas{$_});
+        my @studentdata=&exportsheet($sheet,$sname,$sdom,'studentcalc',
+                                     undef,undef,$r);
         undef %userrdatas;
         $now++;
         $r->print('<script>popwin.document.popremain.remaining.value="'.
@@ -2036,20 +2397,20 @@ ENDPOP
             if (defined($studentdata[$index])) {
                 my $col=$_;
                 if ($studentdata[$index]=~/\D/) {
-                    $c{$col.$row}="'".$studentdata[$index]."'";
+                    $constants{$col.$row}="'".$studentdata[$index]."'";
                 } else {
-                    $c{$col.$row}=$studentdata[$index];
+                    $constants{$col.$row}=$studentdata[$index];
                 }
                 unless ($col eq 'A') { 
-                    $f{$col.$row}='import';
+                    $formulas{$col.$row}='import';
                 }
             } 
             $index++;
         }
     }
-    $sheet->{'f'}=\%f;
+    $sheet->{'f'}=\%formulas;
     &setformulas($sheet);
-    &setconstants($sheet,\%c);
+    &setconstants($sheet,\%constants);
     $r->print('<script>popwin.close()</script>');
     $r->rflush(); 
 }
@@ -2057,7 +2418,7 @@ ENDPOP
 # ------------------------------------------------ Load data for one assessment
 #
 sub loadassessment {
-    my ($sheet)=@_;
+    my ($sheet,$r,$c)=@_;
 
     my $uhome = $sheet->{'uhome'};
     my $uname = $sheet->{'uname'};
@@ -2207,8 +2568,7 @@ sub selectbox {
 
 sub updatesheet {
     my ($sheet)=@_;
-    my $stype=$sheet->{'sheettype'};
-    if ($stype eq 'classcalc') {
+    if ($sheet->{'sheettype'} eq 'classcalc') {
 	return &updateclasssheet($sheet);
     } else {
         return &updatestudentassesssheet($sheet);
@@ -2222,13 +2582,14 @@ sub updatesheet {
 
 sub loadrows {
     my ($sheet,$r)=@_;
+    my $c = $r->connection;
     my $stype=$sheet->{'sheettype'};
     if ($stype eq 'classcalc') {
-	&loadcourse($sheet,$r);
+	&loadcourse($sheet,$r,$c);
     } elsif ($stype eq 'studentcalc') {
-        &loadstudent($sheet);
+        &loadstudent($sheet,$r,$c);
     } else {
-        &loadassessment($sheet);
+        &loadassessment($sheet,$r,$c);
     }
 }
 
@@ -2269,7 +2630,7 @@ sub forcedrecalc {
 # returns the export row for a spreadsheet.
 #
 sub exportsheet {
-    my ($sheet,$uname,$udom,$stype,$usymb,$fn)=@_;
+    my ($sheet,$uname,$udom,$stype,$usymb,$fn,$r)=@_;
     $uname = $uname || $sheet->{'uname'};
     $udom  = $udom  || $sheet->{'udom'};
     $stype = $stype || $sheet->{'sheettype'};
@@ -2319,11 +2680,11 @@ sub exportsheet {
     }
     #
     # Not cached
-    #        
+    #
     my ($newsheet)=&makenewsheet($uname,$udom,$stype,$usymb);
     &readsheet($newsheet,$fn);
     &updatesheet($newsheet);
-    &loadrows($newsheet);
+    &loadrows($newsheet,$r);
     &calcsheet($newsheet); 
     @exportarr=&exportdata($newsheet);
     ##
@@ -2383,13 +2744,13 @@ sub exportsheet {
 #
 # Load previously cached student spreadsheets for this course
 #
-sub expirationdates {
+sub load_spreadsheet_expirationdates {
     undef %expiredates;
     my $cid=$ENV{'request.course.id'};
     my @tmp = &Apache::lonnet::dump('nohist_expirationdates',
                                     $ENV{'course.'.$cid.'.domain'},
                                     $ENV{'course.'.$cid.'.num'});
-    if (lc($tmp[0])!~/^error/){
+    if (lc($tmp[0]) !~ /^error/){
         %expiredates = @tmp;
     }
 }
@@ -2421,18 +2782,21 @@ sub cachedssheets {
     my ($sheet,$uname,$udom) = @_;
     $uname = $uname || $sheet->{'uname'};
     $udom  = $udom  || $sheet->{'udom'};
-    if (! $loadedcaches{$sheet->{'uname'}.'_'.$sheet->{'udom'}}) {
+    if (! $loadedcaches{$uname.'_'.$udom}) {
         my @tmp = &Apache::lonnet::dump('nohist_calculatedsheets',
                                         $sheet->{'udom'},
                                         $sheet->{'uname'});
         if ($tmp[0] !~ /^error/) {
-            my %StupidTempHash = @tmp;
-            while (my ($key,$value) = each %StupidTempHash) {
+            my %TempHash = @tmp;
+            my $count = 0;
+            while (my ($key,$value) = each %TempHash) {
                 $oldsheets{$key} = $value;
+                $count++;
             }
             $loadedcaches{$sheet->{'uname'}.'_'.$sheet->{'udom'}}=1;
         }
     }
+    
 }
 
 # ===================================================== Calculated sheets cache
@@ -2448,9 +2812,19 @@ sub cachedssheets {
 sub handler {
     my $r=shift;
 
+    my ($sheettype) = ($r->uri=~/\/(\w+)$/);
+
     if (! exists($ENV{'form.Status'})) {
         $ENV{'form.Status'} = 'Active';
     }
+    if ( ! exists($ENV{'form.output'}) || 
+             ($sheettype ne 'classcalc' && 
+              lc($ENV{'form.output'}) eq 'recursive excel')) {
+        $ENV{'form.output'} = 'HTML';
+    }
+    #
+    # Overload checking
+    #
     # Check this server
     my $loaderror=&Apache::lonnet::overloaderror($r);
     if ($loaderror) { return $loaderror; }
@@ -2458,15 +2832,22 @@ sub handler {
     $loaderror= &Apache::lonnet::overloaderror($r,
                       $ENV{'course.'.$ENV{'request.course.id'}.'.home'});
     if ($loaderror) { return $loaderror; } 
-    
+    #
+    # HTML Header
+    #
     if ($r->header_only) {
         $r->content_type('text/html');
         $r->send_http_header;
         return OK;
     }
+    #
     # Global directory configs
+    #
     $includedir = $r->dir_config('lonIncludes');
     $tmpdir = $r->dir_config('lonDaemons').'/tmp/';
+    #
+    # Roles Checking
+    #
     # Needs to be in a course
     if (! $ENV{'request.course.fn'}) { 
         # Not in a course, or not allowed to modify parms
@@ -2474,17 +2855,27 @@ sub handler {
             $r->uri.":opa:0:0:Cannot modify spreadsheet";
         return HTTP_NOT_ACCEPTABLE; 
     }
+    #
     # Get query string for limited number of parameters
-    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
-                                            ['uname','udom','usymb','ufn']);
+    #
+    &Apache::loncommon::get_unprocessed_cgi
+        ($ENV{'QUERY_STRING'},['uname','udom','usymb','ufn','mapid','resid']);
+    #
+    # Deal with restricted student permissions 
+    #
     if ($ENV{'request.role'} =~ /^st\./) {
         delete $ENV{'form.unewfield'}   if (exists($ENV{'form.unewfield'}));
         delete $ENV{'form.unewformula'} if (exists($ENV{'form.unewformula'}));
     }
+    #
+    # Clean up symb and spreadsheet filename
+    #
     if (($ENV{'form.usymb'}=~/^\_(\w+)/) && (!$ENV{'form.ufn'})) {
         $ENV{'form.ufn'}='default_'.$1;
     }
+    #
     # Interactive loading of specific sheet?
+    #
     if (($ENV{'form.load'}) && ($ENV{'form.loadthissheet'} ne 'Default')) {
         $ENV{'form.ufn'}=$ENV{'form.loadthissheet'};
     }
@@ -2500,24 +2891,55 @@ sub handler {
         $adom=$ENV{'form.udom'};
     }
     #
-    # Open page
+    # Open page, try to prevent browser cache.
+    #
     $r->content_type('text/html');
     $r->header_out('Cache-control','no-cache');
     $r->header_out('Pragma','no-cache');
     $r->send_http_header;
-    # Screen output
+    #
+    # Header....
+    #
     $r->print('<html><head><title>LON-CAPA Spreadsheet</title>');
+    my $nothing = "''";
+    if ($ENV{'browser.type'} eq 'explorer') {
+        $nothing = "'javascript:void(0);'";
+    }
+
     if ($ENV{'request.role'} !~ /^st\./) {
         $r->print(<<ENDSCRIPT);
 <script language="JavaScript">
 
-    function celledit(cn,cf) {
-        var cnf=prompt(cn,cf);
-        if (cnf!=null) {
-            document.sheet.unewfield.value=cn;
-            document.sheet.unewformula.value=cnf;
-            document.sheet.submit();
+    var editwin;
+
+    function celledit(cellname,cellformula) {
+        var edit_text = '';
+        edit_text +='<html><head><title>Cell Edit Window</title></head><body>';
+        edit_text += '<form name="editwinform">';
+        edit_text += '<center><h3>Cell '+cellname+'</h3>';
+        edit_text += '<textarea name="newformula" cols="40" rows="6"';
+        edit_text += ' wrap="off" >'+cellformula+'</textarea>';
+        edit_text += '</br>';
+        edit_text += '<input type="button" name="accept" value="Accept"';
+        edit_text += ' onClick=\\\'javascript:';
+        edit_text += 'opener.document.sheet.unewfield.value=';
+        edit_text +=     '"'+cellname+'";';
+        edit_text += 'opener.document.sheet.unewformula.value=';
+        edit_text +=     'document.editwinform.newformula.value;';
+        edit_text += 'opener.document.sheet.submit();';
+        edit_text += 'self.close()\\\' />';
+        edit_text += '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;';
+        edit_text += '<input type="button" name="abort" ';
+        edit_text +=     'value="Discard Changes"';
+        edit_text += ' onClick="javascript:self.close()" />';
+        edit_text += '</center></body></html>';
+
+        if (editwin != null && !(editwin.closed) ) {
+            editwin.close();
         }
+
+        editwin = window.open($nothing,'CellEditWin','height=200,width=350,scrollbars=no,resizeable=yes,alwaysRaised=yes,dependent=yes',true);
+        editwin.document.write(edit_text);
     }
 
     function changesheet(cn) {
@@ -2536,7 +2958,7 @@ sub handler {
 ENDSCRIPT
     }
     $r->print('</head>'.&Apache::loncommon::bodytag('Grades Spreadsheet').
-              '<form action="'.$r->uri.'" name=sheet method=post>');
+              '<form action="'.$r->uri.'" name="sheet" method="post">');
     $r->print(&hiddenfield('uname',$ENV{'form.uname'}).
               &hiddenfield('udom',$ENV{'form.udom'}).
               &hiddenfield('usymb',$ENV{'form.usymb'}).
@@ -2545,17 +2967,41 @@ ENDSCRIPT
     $r->rflush();
     #
     # Full recalc?
+    #
     if ($ENV{'form.forcerecalc'}) {
         $r->print('<h4>Completely Recalculating Sheet ...</h4>');
         undef %spreadsheets;
         undef %courserdatas;
         undef %userrdatas;
         undef %defaultsheets;
-        undef %updatedata;
+        undef %rowlabel_cache;
     }
     # Read new sheet or modified worksheet
-    $r->uri=~/\/(\w+)$/;
-    my ($sheet)=&makenewsheet($aname,$adom,$1,$ENV{'form.usymb'});
+    my ($sheet)=&makenewsheet($aname,$adom,$sheettype,$ENV{'form.usymb'});
+    #
+    # Check user permissions
+    if (($sheet->{'sheettype'} eq 'classcalc'       ) || 
+        ($sheet->{'uname'}     ne $ENV{'user.name'} ) ||
+        ($sheet->{'udom'}      ne $ENV{'user.domain'})) {
+        unless (&Apache::lonnet::allowed('vgr',$sheet->{'cid'})) {
+            $r->print('<h1>Access Permission Denied</h1>'.
+                      '</form></body></html>');
+            return OK;
+        }
+    }
+    # Print out user information
+    $r->print('<h2>'.$sheet->{'coursedesc'}.'</h2>');
+    if ($sheet->{'sheettype'} ne 'classcalc') {
+        $r->print('<h2>'.&gettitle($sheet).'</h2><p>');
+    }
+    if ($sheet->{'sheettype'} eq 'assesscalc') {
+        $r->print('<b>User:</b> '.$sheet->{'uname'}.
+                  '<br /><b>Domain:</b> '.$sheet->{'udom'}.'<br />');
+    }
+    if ($sheet->{'sheettype'} eq 'studentcalc' || 
+        $sheet->{'sheettype'} eq 'assesscalc') {
+        $r->print('<b>Section/Group:</b>'.$sheet->{'csec'}.'</p>');
+    } 
     #
     # If a new formula had been entered, go from work copy
     if ($ENV{'form.unewfield'}) {
@@ -2571,43 +3017,23 @@ ENDSCRIPT
     } else {
         &readsheet($sheet,$ENV{'form.ufn'});
     }
-    # Print out user information
-    if ($sheet->{'sheettype'} ne 'classcalc') {
-        $r->print('<p><b>User:</b> '.$sheet->{'uname'}.
-                  '<br><b>Domain:</b> '.$sheet->{'udom'});
-        $r->print('<br><b>Section/Group:</b> '.$sheet->{'csec'});
-        if ($ENV{'form.usymb'}) {
-            $r->print('<br><b>Assessment:</b> <tt>'.
-                      $ENV{'form.usymb'}.'</tt>');
-        }
-    }
-    #
-    # Check user permissions
-    if (($sheet->{'sheettype'} eq 'classcalc'       ) || 
-        ($sheet->{'uname'}     ne $ENV{'user.name'} ) ||
-        ($sheet->{'udom'}      ne $ENV{'user.domain'})) {
-        unless (&Apache::lonnet::allowed('vgr',$sheet->{'cid'})) {
-            $r->print('<h1>Access Permission Denied</h1>'.
-                      '</form></body></html>');
-            return OK;
-        }
-    }
     # Additional options
-    $r->print('<br />'.
-              '<input type="submit" name="forcerecalc" '.
-              'value="Completely Recalculate Sheet"><p>');
     if ($sheet->{'sheettype'} eq 'assesscalc') {
         $r->print('<p><font size=+2>'.
                   '<a href="/adm/studentcalc?'.
                   'uname='.$sheet->{'uname'}.
                   '&udom='.$sheet->{'udom'}.'">'.
-                  'Level up: Student Sheet</a></font><p>');
+                  'Level up: Student Sheet</a></font></p>');
     }
     if (($sheet->{'sheettype'} eq 'studentcalc') && 
         (&Apache::lonnet::allowed('vgr',$sheet->{'cid'}))) {
         $r->print ('<p><font size=+2><a href="/adm/classcalc">'.
-                   'Level up: Course Sheet</a></font><p>');
+                   'Level up: Course Sheet</a></font></p>');
     }
+    # Recalc button
+    $r->print('<br />'.
+              '<input type="submit" name="forcerecalc" '.
+              'value="Completely Recalculate Sheet"></p>');
     # Save dialog
     if (&Apache::lonnet::allowed('opa',$ENV{'request.course.id'})) {
         my $fname=$ENV{'form.ufn'};
@@ -2636,10 +3062,18 @@ ENDSCRIPT
                             &othersheets($sheet,'assesscalc'));
         }
     }
-    # Cached sheets
-    &expirationdates();
-    undef %oldsheets;
-    undef %loadedcaches;
+    #
+    # Set up caching mechanisms
+    #
+    &load_spreadsheet_expirationdates();
+    # Clear out old caches if we have not seen this class before.
+    if (exists($oldsheets{'course'}) &&
+        $oldsheets{'course'} ne $sheet->{'cid'}) {
+        undef %oldsheets;
+        undef %loadedcaches;
+    }
+    $oldsheets{'course'} = $sheet->{'cid'};
+    #
     if ($sheet->{'sheettype'} eq 'classcalc') {
         $r->print("Loading previously calculated student sheets ...\n");
         $r->rflush();
@@ -2679,12 +3113,12 @@ ENDSCRIPT
     }
     #
     # Write the modified worksheet
-    $r->print('<b>Current sheet:</b> '.$sheet->{'filename'}.'<p>');
+    $r->print('<b>Current sheet:</b> '.$sheet->{'filename'}.'</p>');
     &tmpwrite($sheet);
     if ($sheet->{'sheettype'} eq 'studentcalc') {
-        $r->print('<br>Show rows with empty A column: ');
+        $r->print('<p>Show rows with empty A column: ');
     } else {
-        $r->print('<br>Show empty rows: ');
+        $r->print('<p>Show empty rows: ');
     }
     #
     $r->print(&hiddenfield('userselhidden','true').
@@ -2704,10 +3138,24 @@ ENDSCRIPT
     $r->print('>');
     #
     # CSV format checkbox (classcalc sheets only)
-    $r->print(' Output CSV format: <input type="checkbox" '.
-              'name="showcsv" onClick="submit()"');
-    $r->print(' checked') if ($ENV{'form.showcsv'});
-    $r->print('>');
+    $r->print(' Output as <select name="output" size="1" onClick="submit()">'.
+              "\n");
+    foreach my $mode (qw/HTML CSV Excel/) {
+        $r->print('<option value="'.$mode.'"');
+        if ($ENV{'form.output'} eq $mode) {
+            $r->print(' selected ');
+        } 
+        $r->print('>'.$mode.'</option>'."\n");
+    }
+    if ($sheet->{'sheettype'} eq 'classcalc') {
+        $r->print('<option value="recursive excel"');
+        if ($ENV{'form.output'} eq 'recursive excel') {
+            $r->print(' selected ');
+        } 
+        $r->print(">Multi-Sheet Excel</option>\n");
+    }
+    $r->print("</select>\n");
+    #
     if ($sheet->{'sheettype'} eq 'classcalc') {
         $r->print('&nbsp;Student Status: '.
                   &Apache::lonhtmlcommon::StatusOptions
@@ -2715,13 +3163,13 @@ ENDSCRIPT
     }
     #
     # Buttons to insert rows
-    $r->print(<<ENDINSERTBUTTONS);
-<br>
-<input type='button' onClick='insertrow("top");' 
-value='Insert Row Top'>
-<input type='button' onClick='insertrow("bottom");' 
-value='Insert Row Bottom'><br>
-ENDINSERTBUTTONS
+#    $r->print(<<ENDINSERTBUTTONS);
+#<br>
+#<input type='button' onClick='insertrow("top");' 
+#value='Insert Row Top'>
+#<input type='button' onClick='insertrow("bottom");' 
+#value='Insert Row Bottom'><br>
+#ENDINSERTBUTTONS
     # Print out sheet
     &outsheet($r,$sheet);
     $r->print('</form></body></html>');