--- loncom/interface/Attic/lonspreadsheet.pm	2002/10/30 15:07:20	1.131
+++ loncom/interface/Attic/lonspreadsheet.pm	2002/11/12 22:44:28	1.139
@@ -1,5 +1,5 @@
 #
-# $Id: lonspreadsheet.pm,v 1.131 2002/10/30 15:07:20 matthew Exp $
+# $Id: lonspreadsheet.pm,v 1.139 2002/11/12 22:44:28 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -62,6 +62,9 @@ use GDBM_File;
 use HTML::TokeParser;
 use Apache::lonhtmlcommon;
 use Apache::loncoursedata;
+use Apache::File();
+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, 
@@ -122,6 +125,7 @@ my $tmpdir;
 ##
 sub mask {
     my ($lower,$upper)=@_;
+    $upper = $lower if (! defined($upper));
     #
     my ($la,$ld) = ($lower=~/([A-Za-z]|\*)(\d+|\*)/);
     my ($ua,$ud) = ($upper=~/([A-Za-z]|\*)(\d+|\*)/);
@@ -130,9 +134,8 @@ sub mask {
     my $num='';
     #
     if (($la eq '*') || ($ua eq '*')) {
-       $alpha='[A-Za-z]';
+        $alpha='[A-Za-z]';
     } else {
-        
        if (($la=~/[A-Z]/) && ($ua=~/[A-Z]/) ||
            ($la=~/[a-z]/) && ($ua=~/[a-z]/)) {
           $alpha='['.$la.'-'.$ua.']';
@@ -194,8 +197,6 @@ sub mask {
     return '^'.$alpha.$num."\$";
 }
 
-
-
 sub initsheet {
     my $safeeval = new Safe(shift);
     my $safehole = new Safe::Hole;
@@ -238,6 +239,7 @@ undef @os;  # Holds the names of other s
     # the spreadsheets that are available for the assessment sheet.
     # Set by &setothersheets.  &setothersheets is called by &handler.  A
     # related subroutine is &othersheets.
+#$errorlog = '';
 
 $maxrow = 0;
 $sheettype = '';
@@ -591,7 +593,8 @@ compute the average of the items in the
 #-------------------------------------------------------
 sub MEAN {
     my $mask=mask(@_);
-    my $sum=0; my $num=0;
+    my $sum=0; 
+    my $num=0;
     foreach (grep /$mask/,keys(%sheet_values)) {
         $sum+=$sheet_values{$_};
         $num++;
@@ -926,6 +929,7 @@ sub calc {
     while ($notfinished) {
 	$notfinished=0;
         foreach (keys(%t)) {
+            #$errorlog .= "$_:".$t{$_};
             my $old=$sheet_values{$_};
             $sheet_values{$_}=eval $t{$_};
 	    if ($@) {
@@ -933,6 +937,7 @@ sub calc {
                 return $_.': '.$@;
             }
 	    if ($sheet_values{$_} ne $old) { $notfinished=1; $lastcalc=$_; }
+            #$errorlog .= ":".$sheet_values{$_}."\n";
         }
         $depth++;
         if ($depth>100) {
@@ -950,54 +955,39 @@ ENDDEFS
 }
 
 #
-#
+# 
 #
 sub templaterow {
     my $sheet = shift;
     my @cols=();
-    $cols[0]='<b><font size=+1>Template</font></b>';
+    my $rowlabel = 'Template';
     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',
 	     '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') {
         my $fm=$sheet->{'f'}->{'template_'.$_};
         $fm=~s/[\'\"]/\&\#34;/g;
-        push(@cols,"'template_$_','$fm'".'___eq___'.$fm);
+        push(@cols,{ name    => 'template_'.$_,
+                     formula => $fm,
+                     value   => $fm });
     }
-    return @cols;
+    return ($rowlabel,@cols);
 }
 
-
 sub outrowassess {
     # $n is the current row number
-    my $sheet = shift;
-    my $n=shift; 
-    my $csv = $ENV{'form.showcsv'};
+    my ($sheet,$n) = @_;
     my @cols=();
+    my $rowlabel='';
     if ($n) {
         my ($usy,$ufn)=split(/__&&&\__/,$sheet->{'f'}->{'A'.$n});
-        if ($sheet->{'rowlabel'}->{$usy}) {
-            $cols[0]=&format_rowlabel($sheet->{'rowlabel'}->{$usy});
-            if (! $csv) {
-                $cols[0].='<br>'.
-                '<select name="sel_'.$n.'" onChange="changesheet('.$n.')">'.
-                    '<option name="default">Default</option>';
-            }
+        if (exists($sheet->{'rowlabel'}->{$usy})) {
+            $rowlabel = $sheet->{'rowlabel'}->{$usy};
         } else { 
-            $cols[0]=''; 
-        }
-        if (! $csv) {
-            foreach (@{$sheet->{'othersheets'}}) {
-                $cols[0].='<option name="'.$_.'"';
-                if ($ufn eq $_) {
-                    $cols[0].=' selected';
-                }
-                $cols[0].='>'.$_.'</option>';
-            }
-            $cols[0].='</select>';
+            $rowlabel = '';
         }
     } else {
-        $cols[0]='<b><font size=+1>Export</font></b>';
+        $rowlabel = 'Export';
     }
     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',
@@ -1005,19 +995,25 @@ sub outrowassess {
 	     'n','o','p','q','r','s','t','u','v','w','x','y','z') {
         my $fm=$sheet->{'f'}->{$_.$n};
         $fm=~s/[\'\"]/\&\#34;/g;
-        push(@cols,"'$_$n','$fm'".'___eq___'.$sheet->{'values'}->{$_.$n});
+        push(@cols,{ name    => $_.$n,
+                     formula => $fm,
+                     value   => $sheet->{'values'}->{$_.$n}});
     }
-    return @cols;
+    return ($rowlabel,@cols);
 }
 
 sub outrow {
-    my $sheet=shift;
-    my $n=shift;
+    my ($sheet,$n)=@_;
     my @cols=();
+    my $rowlabel;
     if ($n) {
-        $cols[0]=&format_rowlabel($sheet->{'rowlabel'}->{$sheet->{'f'}->{'A'.$n}});
+        $rowlabel = $sheet->{'rowlabel'}->{$sheet->{'f'}->{'A'.$n}};
     } else {
-       $cols[0]='<b><font size=+1>Export</font></b>';
+        if ($sheet->{'sheettype'} eq 'classcalc') {
+            $rowlabel = 'Summary';
+        } else {
+            $rowlabel = 'Export';
+        }
     }
     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',
@@ -1025,9 +1021,11 @@ sub outrow {
 	     'n','o','p','q','r','s','t','u','v','w','x','y','z') {
         my $fm=$sheet->{'f'}->{$_.$n};
         $fm=~s/[\'\"]/\&\#34;/g;
-        push(@cols,"'$_$n','$fm'".'___eq___'.$sheet->{'values'}->{$_.$n});
+        push(@cols,{ name    => $_.$n,
+                     formula => $fm,
+                     value   => $sheet->{'values'}->{$_.$n}});
     }
-    return @cols;
+    return ($rowlabel,@cols);
 }
 
 # ------------------------------------------------ Add or change formula values
@@ -1083,6 +1081,49 @@ sub getformulas {
     return %{$sheet->{'safe'}->varglob('f')};
 }
 
+sub geterrorlog {
+    my $sheet = shift;
+    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;
@@ -1105,184 +1146,520 @@ sub exportdata {
     return @exportarray;
 }
 
+
+
+sub update_student_sheet{
+    my $sheet = shift;
+    # Load in the studentcalc sheet
+    &readsheet($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($sheet);
+    # Compute the sheet
+    &calcsheet($sheet);
+}
+
 # ========================================================== End of Spreadsheet
 # =============================================================================
-
 #
-# Procedures for screen output
+# Procedures for spreadsheet output
 #
 # --------------------------------------------- Produce output row n from sheet
 
-sub rown {
-    my ($sheet,$n)=@_;
-    my $defaultbg;
-    my $rowdata='';
-    my $dataflag=0;
-    unless ($n eq '-') {
-        $defaultbg=((($n-1)/5)==int(($n-1)/5))?'#E0E0':'#FFFF';
-    } else {
-        $defaultbg='#E0FF';
-    }
-    unless ($ENV{'form.showcsv'}) {
-        $rowdata.="\n<tr><td><b><font size=+1>$n</font></b></td>";
+sub get_row {
+    my ($sheet,$n) = @_;
+    my ($rowlabel,@rowdata);
+    if ($n eq '-') { 
+        ($rowlabel,@rowdata) = &templaterow($sheet);
+    } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
+        ($rowlabel,@rowdata) = &outrowassess($sheet,$n);
     } else {
-        $rowdata.="\n".'"'.$n.'"';
+        ($rowlabel,@rowdata) = &outrow($sheet,$n);
     }
-    my $showf=0;
+    return ($rowlabel,@rowdata);
+}
+
+########################################################################
+########################################################################
+sub sort_indicies {
+    my $sheet = shift;
     #
-    # Determine how many pink (uneditable) cells there are in this sheet.
-    my $maxred=1;
-    my $sheettype=$sheet->{'sheettype'};
-    if ($sheettype eq 'studentcalc') {
-        $maxred=26;
-    } elsif ($sheettype eq 'assesscalc') {
-        $maxred=1;
-    } else {
-        $maxred=26;
-    }
-    $maxred=1 if (&getfa($sheet,$n)=~/^[\~\-]/);
+    # Sort the rows in some manner
     #
-    # Get the proper row
-    my @rowdata;
-    if ($n eq '-') { 
-        @rowdata = &templaterow($sheet);
-        $n=-1; 
-        $dataflag=1; 
-    } elsif ($sheettype eq 'studentcalc') {
-        @rowdata = &outrowassess($sheet,$n);
-    } else {
-        @rowdata = &outrow($sheet,$n);
-    }
-    #
-    foreach (@rowdata) {
-        my $bgcolor=$defaultbg.((($showf-1)/5==int(($showf-1)/5))?'99':'DD');
-        my ($fm,$vl)=split(/\_\_\_eq\_\_\_/,$_);
-        if ((($vl ne '') || ($vl eq '0')) &&
-            (($showf==1) || ($sheettype ne 'studentcalc'))) { $dataflag=1; }
-        if ($showf==0) { $vl=$_; }
-        unless ($ENV{'form.showcsv'}) {
-            if ($showf<=$maxred) { $bgcolor='#FFDDDD'; }
-            if (($n==0) && ($showf<=26)) { $bgcolor='#CCCCFF'; } 
-            if (($showf>$maxred) || ((!$n) && ($showf>0))) {
-                if ($vl eq '') {
-                    $vl='<font size=+2 color='.$bgcolor.'>&#35;</font>';
-                }
-                $rowdata.='<td bgcolor='.$bgcolor.'>';
-                if ($ENV{'request.role'} =~ /^st\./) {
-                    $rowdata.=$vl;
-                } else {
-                    $rowdata.='<a href="javascript:celledit('.$fm.');">'.
-                        $vl.'</a>';
-                }
-                $rowdata.='</td>';
-            } else {
-                $rowdata.='<td bgcolor='.$bgcolor.'>&nbsp;'.$vl.'&nbsp;</td>';
-            }
-        } else {
-            $rowdata.=',"'.$vl.'"';
-        }
-        $showf++;
-    }  # End of foreach($safeval...)
-    if ($ENV{'form.showall'} || ($dataflag)) {
-        return $rowdata.($ENV{'form.showcsv'}?'':'</tr>');
-    } else {
-        return '';
+    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, $row);
     }
+    @sortidx=sort { lc($sortby[$a]) cmp lc($sortby[$b]); } @sortidx;
+    return @sortidx;
 }
 
-# ------------------------------------------------------------- Print out sheet
+#############################################################
+###                                                       ###
+###              Spreadsheet Output Routines              ###
+###                                                       ###
+#############################################################
+
+############################################
+##         HTML output routines           ##
+############################################
+sub html_editable_cell {
+    my ($cell,$bgcolor) = @_;
+    my $result;
+    my ($name,$formula,$value);
+    if (defined($cell)) {
+        $name    = $cell->{'name'};
+        $formula = $cell->{'formula'};
+        $value   = $cell->{'value'};
+    }
+    $name    = '' if (! defined($name));
+    $formula = '' if (! defined($formula));
+    if (! defined($value)) {
+        $value = '<font color="'.$bgcolor.'">#</font>';
+        if ($formula ne '') {
+            $value = '<i>undefined value</i>';
+        }
+    }
+    if ($value =~ /^\s*$/ ) {
+        $value = '<font color="'.$bgcolor.'">#</font>';
+    }
+    $formula =~ s/\n/\\n/gs;
+    $result .= '<a href="javascript:celledit(\''.
+        $name.'\',\''.$formula.'\');">'.$value.'</a>';
+    return $result;
+}
 
-sub outsheet {
-    my ($r,$sheet)=@_;
-    my $maxred = 26;    # The maximum number of cells to show as 
-                        # red (uneditable) 
-                        # To make student sheets uneditable could we 
-                        # set $maxred = 52?
-                        #
-    my $realm='Course'; # 'assessment', 'user', or 'course' sheet
+sub html_uneditable_cell {
+    my ($cell,$bgcolor) = @_;
+    my $value = (defined($cell) ? $cell->{'value'} : '');
+    return '&nbsp;'.$value.'&nbsp;';
+}
+
+sub outsheet_html  {
+    my ($sheet,$r) = @_;
+    my ($num_uneditable,$realm,$row_type);
     if ($sheet->{'sheettype'} eq 'assesscalc') {
-        $maxred=1;
-        $realm='Assessment';
+        $num_uneditable = 1;
+        $realm = 'Assessment';
+        $row_type = 'Item';
     } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
-        $maxred=26;
-        $realm='User';
+        $num_uneditable = 26;
+        $realm = 'User';
+        $row_type = 'Assessment';
+    } elsif ($sheet->{'sheettype'} eq 'classcalc') {
+        $num_uneditable = 26;
+        $realm = 'Course';
+        $row_type = 'Student';
+    } else {
+        return;  # error
+    }
+    ####################################
+    # Print out header table
+    ####################################
+    my $num_left = 52-$num_uneditable;
+    my $tabledata =<<"END";
+<table border="2">
+<tr>
+  <th colspan="1" rowspan="2"><font size="+2">$realm</font></th>
+  <td bgcolor="#FFDDDD" colspan="$num_uneditable">
+      <b><font size="+1">Import</font></b></td>
+  <td colspan="$num_left">
+      <b><font size="+1">Calculations</font></b></td>
+</tr><tr>
+END
+    my $label_num = 0;
+    foreach (split(//,'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz')){
+        if ($label_num<$num_uneditable) { 
+            $tabledata.='<td bgcolor="#FFDDDD">';
+        } else {
+            $tabledata.='<td>';
+        }
+        $tabledata.="<b><font size=+1>$_</font></b></td>";
+        $label_num++;
+    }
+    $tabledata.="</tr>\n";
+    $r->print($tabledata);
+    ####################################
+    # Print out template row
+    ####################################
+    my ($rowlabel,@rowdata) = &get_row($sheet,'-');
+    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) {
+            $row_html .= '<td bgcolor="#FFDDDD">';
+            $row_html .= &html_uneditable_cell($cell,'#FFDDDD');
+        } else {
+            $row_html .= '<td bgcolor="#EOFFDD">';
+            $row_html .= &html_editable_cell($cell,'#E0FFDD');
+        }
+        $row_html .= '</td>';
+    }
+    $row_html.= "</tr>\n";
+    $r->print($row_html);
+    ####################################
+    # Print out summary/export row
+    ####################################
+    my ($rowlabel,@rowdata) = &get_row($sheet,'0');
+    $row_html = '<tr><td>'.&format_html_rowlabel($rowlabel).'</td>';
+    $num_cols_output = 0;
+    foreach my $cell (@rowdata) {
+        if ($num_cols_output++ < 26) {
+            $row_html .= '<td bgcolor="#CCCCFF">';
+            $row_html .= &html_editable_cell($cell,'#CCCCFF');
+        } else {
+            $row_html .= '<td bgcolor="#DDCCFF">';
+            $row_html .= &html_uneditable_cell(undef,'#CCCCFF');
+        }
+        $row_html .= '</td>';
     }
+    $row_html.= "</tr>\n";
+    $r->print($row_html);
+    $r->print('</table>');
+    ####################################
+    # Prepare to output rows
+    ####################################
+    my @Rows = &sort_indicies($sheet);
     #
-    # Column label
-    my $tabledata;
-    if ($ENV{'form.showcsv'}) {
-        $tabledata='<pre>';
-    } else { 
-        $tabledata='<table border=2><tr><th colspan=2 rowspan=2>'.
-            '<font size=+2>'.$realm.'</font></th>'.
-                  '<td bgcolor=#FFDDDD colspan='.$maxred.
-                  '><b><font size=+1>Import</font></b></td>'.
-                  '<td colspan='.(52-$maxred).
-		  '><b><font size=+1>Calculations</font></b></td></tr><tr>';
-        my $showf=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',
-                 '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') {
-            $showf++;
-            if ($showf<=$maxred) { 
-                $tabledata.='<td bgcolor="#FFDDDD">'; 
+    # 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 ($rowlabel =~ /^\s*$/);
+        #
+        my $defaultbg='#E0FF';
+        #
+        my $row_html ="\n".'<tr><td><b><font size=+1>'.$rownum.
+            '</font></b></td>';
+        #
+        if ($sheet->{'sheettype'} eq 'classcalc') {
+            $row_html.='<td>'.&format_html_rowlabel($rowlabel).'</td>';
+            # Output links for each student?
+            # Nope, that is already done for us in format_html_rowlabel (for now)
+        } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
+            $row_html.='<td>'.&format_html_rowlabel($rowlabel);
+            $row_html.= '<br>'.
+                '<select name="sel_'.$rownum.'" '.
+                    'onChange="changesheet('.$rownum.')">'.
+                        '<option name="default">Default</option>';
+            foreach (@{$sheet->{'othersheets'}}) {
+                $row_html.='<option name="'.$_.'"';
+                #if ($ufn eq $_) {
+                #    $row_html.=' selected';
+                #}
+                $row_html.='>'.$_.'</option>';
+            }
+            $row_html.='</select></td>';
+        } elsif ($sheet->{'sheettype'} eq 'assesscalc') {
+            $row_html.='<td>'.&format_html_rowlabel($rowlabel).'</td>';
+        }
+        #
+        my $shown_cells = 0;
+        foreach my $cell (@rowdata) {
+            my $value    = $cell->{'value'};
+            my $formula  = $cell->{'formula'};
+            my $cellname = $cell->{'name'};
+            #
+            my $bgcolor;
+            if ($shown_cells && ($shown_cells/5 == int($shown_cells/5))) {
+                $bgcolor = $defaultbg.'99';
+            } else {
+                $bgcolor = $defaultbg.'DD';
+            }
+            $bgcolor='#FFDDDD' if ($shown_cells < $num_uneditable);
+            #
+            $row_html.='<td bgcolor='.$bgcolor.'>';
+            if ($shown_cells < $num_uneditable) {
+                $row_html .= &html_uneditable_cell($cell,$bgcolor);
             } else {
-                $tabledata.='<td>';
+                $row_html .= &html_editable_cell($cell,$bgcolor);
             }
-            $tabledata.="<b><font size=+1>$_</font></b></td>";
+            $row_html.='</td>';
+            $shown_cells++;
+        }
+        if ($row_html) {
+            if ($rows_output % 25 == 0) {
+                $r->print("</table>\n<br>\n");
+                $r->rflush();
+                $r->print('<table border=2>'.
+                          '<tr><td>&nbsp;<td>'.$row_type.'</td>'.
+                          '<td>'.
+                          join('</td><td>',
+                               (split(//,'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
+                                      'abcdefghijklmnopqrstuvwxyz'))).
+                          "</td></tr>\n");
+            }
+            $rows_output++;
+            $r->print($row_html);
         }
-        $tabledata.='</tr>'.&rown($sheet,'-').
-            &rown($sheet,0);
     }
-    $r->print($tabledata);
     #
+    $r->print('</table>');
+    #
+    # Debugging code (be sure to uncomment errorlog code in safe space):
+    #
+    # $r->print("\n<pre>");
+    # $r->print(&geterrorlog($sheet));
+    # $r->print("\n</pre>");
+    return 1;
+}
+
+############################################
+##         csv output routines            ##
+############################################
+sub outsheet_csv   {
+    my ($sheet,$r) = @_;
+    my $csvdata = '';
+    my @Values;
+    ####################################
     # Prepare to output rows
-    my $row;
+    ####################################
+    my @Rows = &sort_indicies($sheet);
     #
-    # Sort the rows in some manner
+    # 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($workbook));
     #
-    my @sortby=();
-    my @sortidx=();
-    for ($row=1;$row<=$sheet->{'maxrow'};$row++) {
-        push (@sortby, $sheet->{'safe'}->reval('$f{"A'.$row.'"}'));
-        push (@sortidx, $row-1);
+    # 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);
+        # 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) && ($c->aborted())) {
+            last;
+        }
     }
-    @sortidx=sort { lc($sortby[$a]) cmp lc($sortby[$b]); } @sortidx;
     #
-    # Determine the type of child spreadsheets
-    my $what='Student';
-    if ($sheet->{'sheettype'} eq 'assesscalc') {
-        $what='Item';
+    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') {
-        $what='Assessment';
+        $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
-    my $n=0;
-    for ($row=0;$row<$sheet->{'maxrow'};$row++) {
-        my $thisrow=&rown($sheet,$sortidx[$row]+1);
-        if ($thisrow) {
-            if (($n/25==int($n/25)) && (!$ENV{'form.showcsv'})) {
-                $r->print("</table>\n<br>\n");
-                $r->rflush();
-                $r->print('<table border=2><tr><td>&nbsp;<td>'.$what.'</td>');
-                $r->print('<td>'.
-                          join('</td><td>',
-                               (split(//,'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
-                                      'abcdefghijklmnopqrstuvwxyz'))).
-                          "</td></tr>\n");
-            }
-            $n++;
-            $r->print($thisrow);
+    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++;
     }
-    $r->print($ENV{'form.showcsv'}?'</pre>':'</table>');
+    return;
 }
 
-#
-# ----------------------------------------------- Read list of available sheets
-# 
+############################################
+##          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)=@_;
+    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,$r);
+    }
+}
+
+########################################################################
+########################################################################
 sub othersheets {
     my ($sheet,$stype)=@_;
     $stype = $sheet->{'sheettype'} if (! defined($stype));
@@ -1300,7 +1677,6 @@ sub othersheets {
     return @alternatives; 
 }
 
-
 #
 # -------------------------------------- Parse a spreadsheet
 # 
@@ -1413,12 +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,$udom);
     #
     #
@@ -1614,36 +1994,75 @@ sub parmval {
     return &Apache::lonnet::metadata($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 {
-        &Apache::lonnet::logthis("lonspreadsheet:bogus rowlabel type: $type");
+        $result = '<b><font size=+1>'.$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;
 }
@@ -1657,7 +2076,6 @@ sub updateclasssheet {
     my $chome =$sheet->{'chome'};
     #
     %Section = ();
-
     #
     # Read class list and row labels
     my $classlist = &Apache::loncoursedata::get_classlist();
@@ -1669,6 +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,
@@ -1716,29 +2135,81 @@ sub updateclasssheet {
 }
 
 # ----------------------------------- Update rows for student and assess sheets
-sub updatestudentassesssheet {
+sub get_student_rowlabels {
+    my ($sheet) = @_;
+    #
+    my %course_db;
+    #
+    my $stype = $sheet->{'sheettype'};
+    my $uname = $sheet->{'uname'};
+    my $udom  = $sheet->{'udom'};
+    #
+    $sheet->{'rowlabel'} = {};
+    #
+    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(%course_db,'GDBM_File',$sheet->{'coursefilename'}.'.db',
+            &GDBM_READER(),0640);
+        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 %bighash;
+    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'}.'_'.$stype.'_'.$uname.'_'.$udom;
-    if  ($updatedata{$identifier}) {
-        %{$sheet->{'rowlabel'}}=split(/___;___/,$updatedata{$identifier});
+    my $identifier =$sheet->{'coursefilename'}.'_'.$stype.'_'.$usymb;
+    #
+    if  ($rowlabel_cache{$identifier}) {
+        %{$sheet->{'rowlabel'}}=split(/___;___/,$rowlabel_cache{$identifier});
     } else {
+        # Get the data and store it in the cache
         # Tie hash
-        tie(%bighash,'GDBM_File',$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';
         }
-        # 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',
@@ -1748,29 +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');
@@ -1782,46 +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
@@ -1836,13 +2291,11 @@ sub updatestudentassesssheet {
         $sheet->{'f'} = \%f;
         &setformulas($sheet); 
     }
-    #
-    undef %existing;
 }
 
 # ------------------------------------------------ Load data for one assessment
 
-sub loadstudent {
+sub loadstudent{
     my ($sheet)=@_;
     my %c=();
     my %f=&getformulas($sheet);
@@ -1858,18 +2311,18 @@ sub loadstudent {
     undef @tmp;
     # 
     my @assessdata=();
-    foreach (keys(%f)) {
-	next if ($_!~/^A(\d+)/);
+    while (my ($cell,$value) = each (%f)) {
+	next if ($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);
         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[$index]."'";
@@ -1894,8 +2347,10 @@ sub loadstudent {
 #
 sub loadcourse {
     my ($sheet,$r)=@_;
+    #
     my %c=();
     my %f=&getformulas($sheet);
+    #
     my $total=0;
     foreach (keys(%f)) {
 	if ($_=~/^A(\d+)/) {
@@ -1932,7 +2387,7 @@ ENDPOP
         my $index=0;
         foreach ('A','B','C','D','E','F','G','H','I','J','K','L','M',
                  'N','O','P','Q','R','S','T','U','V','W','X','Y','Z') {
-            if (defined($studentdata[$index++])) {
+            if (defined($studentdata[$index])) {
                 my $col=$_;
                 if ($studentdata[$index]=~/\D/) {
                     $c{$col.$row}="'".$studentdata[$index]."'";
@@ -1942,7 +2397,8 @@ ENDPOP
                 unless ($col eq 'A') { 
                     $f{$col.$row}='import';
                 }
-            }
+            } 
+            $index++;
         }
     }
     $sheet->{'f'}=\%f;
@@ -2105,8 +2561,7 @@ 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);
@@ -2172,7 +2627,8 @@ sub exportsheet {
     $udom  = $udom  || $sheet->{'udom'};
     $stype = $stype || $sheet->{'sheettype'};
     my @exportarr=();
-    if (defined($usymb) && ($usymb=~/^\_(\w+)/) && (!$fn)) {
+    if (defined($usymb) && ($usymb=~/^\_(\w+)/) && 
+        (!defined($fn) || $fn eq '')) {
         $fn='default_'.$1;
     }
     #
@@ -2216,7 +2672,7 @@ sub exportsheet {
     }
     #
     # Not cached
-    #        
+    #
     my ($newsheet)=&makenewsheet($uname,$udom,$stype,$usymb);
     &readsheet($newsheet,$fn);
     &updatesheet($newsheet);
@@ -2280,7 +2736,7 @@ 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',
@@ -2318,18 +2774,21 @@ 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
@@ -2345,9 +2804,19 @@ 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; }
@@ -2355,15 +2824,22 @@ 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
@@ -2371,17 +2847,27 @@ 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'};
     }
@@ -2397,24 +2883,55 @@ 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) {
@@ -2433,7 +2950,7 @@ 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'}).
@@ -2442,17 +2959,41 @@ 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 ($ENV{'form.unewfield'}) {
@@ -2468,43 +3009,23 @@ ENDSCRIPT
     } else {
         &readsheet($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'};
@@ -2533,10 +3054,18 @@ 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();
@@ -2576,12 +3105,12 @@ 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').
@@ -2601,10 +3130,24 @@ 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
@@ -2612,13 +3155,13 @@ 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>');