--- loncom/interface/Attic/lonspreadsheet.pm	2002/10/16 16:35:42	1.117
+++ loncom/interface/Attic/lonspreadsheet.pm	2002/12/05 15:31:05	1.155
@@ -1,5 +1,5 @@
 #
-# $Id: lonspreadsheet.pm,v 1.117 2002/10/16 16:35:42 matthew Exp $
+# $Id: lonspreadsheet.pm,v 1.155 2002/12/05 15:31:05 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -53,14 +53,19 @@ 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::Entities();
 use HTML::TokeParser;
-use Apache::lonhtmlcommon;
+use Spreadsheet::WriteExcel;
+
 #
 # Caches for coursewide information 
 #
@@ -90,7 +95,7 @@ my %spreadsheets;
 my %courserdatas;
 my %userrdatas;
 my %defaultsheets;
-my %updatedata;
+my %rowlabel_cache;
 
 #
 # These global hashes are dependent on user, course and resource, 
@@ -116,75 +121,21 @@ my $tmpdir;
 # =============================================================================
 # ===================================== Implements an instance of a spreadsheet
 
-sub initsheet {
-    my $safeeval = new Safe(shift);
-    my $safehole = new Safe::Hole;
-    $safeeval->permit("entereval");
-    $safeeval->permit(":base_math");
-    $safeeval->permit("sort");
-    $safeeval->deny(":base_io");
-    $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
-    $safeeval->share('$@');
-    my $code=<<'ENDDEFS';
-# ---------------------------------------------------- Inside of the safe space
-
-#
-# f: formulas
-# t: intermediate format (variable references expanded)
-# v: output values
-# c: preloaded constants (A-column)
-# rl: row label
-# os: other spreadsheets (for student spreadsheet only)
-
-undef %sheet_values; 
-undef %t;
-undef %f;
-undef %c;
-undef %rowlabel;
-undef @os;
-
-$maxrow = 0;
-$sheettype = '';
-
-# filename/reference of the sheet
-$filename = '';
-
-# user data
-$uname = '';
-$uhome = '';
-$udom  = '';
-
-# course data
-
-$csec = '';
-$chome= '';
-$cnum = '';
-$cdom = '';
-$cid  = '';
-$coursefilename  = '';
-
-# symb
-
-$usymb = '';
-
-# error messages
-$errormsg = '';
-
+##
+## mask - used to reside in the safe space.  
+##
 sub mask {
     my ($lower,$upper)=@_;
-
-    $lower=~/([A-Za-z]|\*)(\d+|\*)/;
-    my $la=$1;
-    my $ld=$2;
-
-    $upper=~/([A-Za-z]|\*)(\d+|\*)/;
-    my $ua=$1;
-    my $ud=$2;
+    $upper = $lower if (! defined($upper));
+    #
+    my ($la,$ld) = ($lower=~/([A-Za-z]|\*)(\d+|\*)/);
+    my ($ua,$ud) = ($upper=~/([A-Za-z]|\*)(\d+|\*)/);
+    #
     my $alpha='';
     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]/)) {
@@ -193,7 +144,6 @@ sub mask {
           $alpha='['.$la.'-Za-'.$ua.']';
        }
     }   
-
     if (($ld eq '*') || ($ud eq '*')) {
 	$num='\d+';
     } else {
@@ -213,7 +163,9 @@ sub mask {
        } else {
            my @lda=($ld=~m/\d/g);
            my @uda=($ud=~m/\d/g);
-           my $i; $j=0; $notdone=1;
+           my $i; 
+           my $j=0; 
+           my $notdone=1;
            for ($i=0;($i<=$#lda)&&($notdone);$i++) {
                if ($lda[$i]==$uda[$i]) {
 		   $num.=$lda[$i];
@@ -237,8 +189,8 @@ sub mask {
                }
                $num.=')';
            } else {
-               if ($lda[$#lda]!=$uda[$#uda]) {
-                  $num.='['.$lda[$#lda].'-'.$uda[$#uda].']';
+               if ($lda[-1]!=$uda[-1]) {
+                  $num.='['.$lda[-1].'-'.$uda[-1].']';
 	       }
            }
        }
@@ -246,6 +198,78 @@ sub mask {
     return '^'.$alpha.$num."\$";
 }
 
+sub initsheet {
+    my $safeeval = new Safe(shift);
+    my $safehole = new Safe::Hole;
+    $safeeval->permit("entereval");
+    $safeeval->permit(":base_math");
+    $safeeval->permit("sort");
+    $safeeval->deny(":base_io");
+    $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
+    $safehole->wrap(\&Apache::lonspreadsheet::mask,$safeeval,'&mask');
+    $safeeval->share('$@');
+    my $code=<<'ENDDEFS';
+# ---------------------------------------------------- Inside of the safe space
+
+#
+# f: formulas
+# t: intermediate format (variable references expanded)
+# v: output values
+# c: preloaded constants (A-column)
+# rl: row label
+# os: other spreadsheets (for student spreadsheet only)
+
+undef %sheet_values;   # Holds the (computed, final) values for the sheet
+    # This is only written to by &calc, the spreadsheet computation routine.
+    # It is read by many functions
+undef %t; # Holds the values of the spreadsheet temporarily. Set in &sett, 
+    # which does the translation of strings like C5 into the value in C5.
+    # Used in &calc - %t holds the values that are actually eval'd.
+undef %f;    # Holds the formulas for each cell.  This is the users
+    # (spreadsheet authors) data for each cell.
+    # set by &setformulas and returned by &getformulas
+    # &setformulas is called by &readsheet, &tmpread, &updateclasssheet,
+    # &updatestudentassesssheet, &loadstudent, &loadcourse
+    # &getformulas is called by &writesheet, &tmpwrite, &updateclasssheet,
+    # &updatestudentassesssheet, &loadstudent, &loadcourse, &loadassessment, 
+undef %c; # Holds the constants for a sheet.  In the assessment
+    # sheets, this is the A column.  Used in &MINPARM, &MAXPARM, &expandnamed,
+    # &sett, and &setconstants.  There is no &getconstants.
+    # &setconstants is called by &loadstudent, &loadcourse, &load assessment,
+undef @os;  # Holds the names of other spreadsheets - this is used to specify
+    # the spreadsheets that are available for the assessment sheet.
+    # Set by &setothersheets.  &setothersheets is called by &handler.  A
+    # related subroutine is &othersheets.
+#$errorlog = '';
+
+$maxrow = 0;
+$sheettype = '';
+
+# filename/reference of the sheet
+$filename = '';
+
+# user data
+$uname = '';
+$uhome = '';
+$udom  = '';
+
+# course data
+
+$csec = '';
+$chome= '';
+$cnum = '';
+$cdom = '';
+$cid  = '';
+$coursefilename  = '';
+
+# symb
+
+$usymb = '';
+
+# error messages
+$errormsg = '';
+
+
 #-------------------------------------------------------
 
 =item UWCALC(hashname,modules,units,date) 
@@ -570,7 +594,8 @@ 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++;
@@ -807,9 +832,11 @@ sub expandnamed {
         foreach $parameter (keys(%c)) {
             push @matches,$parameter if ($parameter =~ /$expression/);
         }
-        if ($#matches == 0) {
+        if (scalar(@matches) == 0) {
+            $returnvalue = 'unmatched parameter: '.$parameter;
+        } elsif (scalar(@matches) == 1) {
             $returnvalue = '$c{\''.$matches[0].'\'}';
-        } elsif ($#matches > 0) {
+        } elsif (scalar(@matches) > 0) {
             # more than one match.  Look for a concise one
             $returnvalue =  "'non-unique parameter name : $expression'";
             foreach (@matches) {
@@ -818,7 +845,9 @@ sub expandnamed {
                 }
             }
         } else {
-            $returnvalue =  "'bad parameter name : $expression'";
+            # There was a negative number of matches, which indicates 
+            # something is wrong with reality.  Better warn the user.
+            $returnvalue = 'bizzare parameter: '.$parameter;
         }
         return $returnvalue;
     }
@@ -901,6 +930,7 @@ sub calc {
     while ($notfinished) {
 	$notfinished=0;
         foreach (keys(%t)) {
+            #$errorlog .= "$_:".$t{$_};
             my $old=$sheet_values{$_};
             $sheet_values{$_}=eval $t{$_};
 	    if ($@) {
@@ -908,6 +938,7 @@ sub calc {
                 return $_.': '.$@;
             }
 	    if ($sheet_values{$_} ne $old) { $notfinished=1; $lastcalc=$_; }
+            #$errorlog .= ":".$sheet_values{$_}."\n";
         }
         $depth++;
         if ($depth>100) {
@@ -918,320 +949,797 @@ sub calc {
     return '';
 }
 
+# ------------------------------------------- End of "Inside of the safe space"
+ENDDEFS
+    $safeeval->reval($code);
+    return $safeeval;
+}
+
+#
+# 
+#
 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 $fm=$f{'template_'.$_};
-        $fm=~s/[\'\"]/\&\#34;/g;
-        push(@cols,"'template_$_','$fm'".'___eq___'.$fm);
+        push(@cols,{ name    => 'template_'.$_,
+                     formula => $sheet->{'f'}->{'template_'.$_},
+                     value   => $sheet->{'f'}->{'template_'.$_} });
     }
-    return @cols;
+    return ($rowlabel,@cols);
 }
 
-#
-# This is actually used for the student spreadsheet, not the assessment sheet
-# Do not be fooled by the name!
-#
 sub outrowassess {
     # $n is the current row number
-    my $n=shift;
+    my ($sheet,$n) = @_;
     my @cols=();
+    my $rowlabel='';
     if ($n) {
-        my ($usy,$ufn)=split(/__&&&\__/,$f{'A'.$n});
-        if ($rowlabel{$usy}) {
-            $cols[0]=$rowlabel{$usy}.'<br>'.
-                '<select name="sel_'.$n.'" onChange="changesheet('.$n.')">'.
-                    '<option name="default">Default</option>';
+        my ($usy,$ufn)=split(/__&&&\__/,$sheet->{'f'}->{'A'.$n});
+        if (exists($sheet->{'rowlabel'}->{$usy})) {
+            # This is dumb, but we need the information when we output
+            # the html version of the studentcalc spreadsheet for the
+            # links to the assesscalc sheets.
+            $rowlabel = $sheet->{'rowlabel'}->{$usy}.':'.
+                &Apache::lonnet::escape($ufn);
         } else { 
-            $cols[0]=''; 
-        }
-        foreach (@os) {
-            $cols[0].='<option name="'.$_.'"';
-            if ($ufn eq $_) {
-                $cols[0].=' selected';
-            }
-            $cols[0].='>'.$_.'</option>';
+            $rowlabel = '';
         }
-        $cols[0].='</select>';
     } 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',
 	     '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 $fm=$f{$_.$n};
-        $fm=~s/[\'\"]/\&\#34;/g;
-        push(@cols,"'$_$n','$fm'".'___eq___'.$sheet_values{$_.$n});
+        push(@cols,{ name    => $_.$n,
+                     formula => $sheet->{'f'}->{$_.$n},
+                     value   => $sheet->{'values'}->{$_.$n}});
     }
-    return @cols;
+    return ($rowlabel,@cols);
 }
 
 sub outrow {
-    my $n=shift;
+    my ($sheet,$n)=@_;
     my @cols=();
+    my $rowlabel;
     if ($n) {
-       $cols[0]=$rowlabel{$f{'A'.$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',
 	     '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 $fm=$f{$_.$n};
-        $fm=~s/[\'\"]/\&\#34;/g;
-        push(@cols,"'$_$n','$fm'".'___eq___'.$sheet_values{$_.$n});
+        push(@cols,{ name    => $_.$n,
+                     formula => $sheet->{'f'}->{$_.$n},
+                     value   => $sheet->{'values'}->{$_.$n}});
     }
-    return @cols;
-}
-
-sub exportrowa {
-    my @exportarray=();
-    foreach ('A','B','C','D','E','F','G','H','I','J','K','L','M',
-	     'N','O','P','Q','R','S','T','U','V','W','X','Y','Z') {
-	push(@exportarray,$sheet_values{$_.'0'});
-    } 
-    return @exportarray;
-}
-
-# ------------------------------------------- End of "Inside of the safe space"
-ENDDEFS
-    $safeeval->reval($code);
-    return $safeeval;
+    return ($rowlabel,@cols);
 }
 
 # ------------------------------------------------ Add or change formula values
 sub setformulas {
-    my ($safeeval,%f)=@_;
-    %{$safeeval->varglob('f')}=%f;
+    my ($sheet)=shift;
+    %{$sheet->{'safe'}->varglob('f')}=%{$sheet->{'f'}};
 }
 
 # ------------------------------------------------ Add or change formula values
 sub setconstants {
-    my ($safeeval,%c)=@_;
-    %{$safeeval->varglob('c')}=%c;
+    my ($sheet)=shift;
+    my ($constants) = @_;
+    if (! ref($constants)) {
+        my %tmp = @_;
+        $constants = \%tmp;
+    }
+    $sheet->{'constants'} = $constants;
+    return %{$sheet->{'safe'}->varglob('c')}=%{$sheet->{'constants'}};
 }
 
 # --------------------------------------------- Set names of other spreadsheets
 sub setothersheets {
-    my ($safeeval,@os)=@_;
-    @{$safeeval->varglob('os')}=@os;
+    my $sheet = shift;
+    my @othersheets = @_;
+    $sheet->{'othersheets'} = \@othersheets;
+    @{$sheet->{'safe'}->varglob('os')}=@othersheets;
+    return;
 }
 
 # ------------------------------------------------ Add or change formula values
 sub setrowlabels {
-    my ($safeeval,%rowlabel)=@_;
-    %{$safeeval->varglob('rowlabel')}=%rowlabel;
+    my $sheet=shift;
+    my ($rowlabel) = @_;
+    if (! ref($rowlabel)) {
+        my %tmp = @_;
+        $rowlabel = \%tmp;
+    }
+    $sheet->{'rowlabel'}=$rowlabel;
 }
 
 # ------------------------------------------------------- Calculate spreadsheet
 sub calcsheet {
-    my $safeeval=shift;
-    return $safeeval->reval('&calc();');
+    my $sheet=shift;
+    my $result =  $sheet->{'safe'}->reval('&calc();');
+    %{$sheet->{'values'}} = %{$sheet->{'safe'}->varglob('sheet_values')};
+    return $result;
 }
 
 # ---------------------------------------------------------------- Get formulas
+# Return a copy of the formulas
 sub getformulas {
-    my $safeeval=shift;
-    return %{$safeeval->varglob('f')};
+    my $sheet = shift;
+    return %{$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 ($safeeval,$n)=@_;
-    return $safeeval->reval('$f{"A'.$n.'"}');
+    my $sheet = shift;
+    my ($n)=@_;
+    return $sheet->{'safe'}->reval('$f{"A'.$n.'"}');
 }
 
 # ------------------------------------------------------------- Export of A-row
 sub exportdata {
-    my $safeeval=shift;
-    return $safeeval->reval('&exportrowa()');
+    my $sheet=shift;
+    my @exportarray=();
+    foreach ('A','B','C','D','E','F','G','H','I','J','K','L','M',
+	     'N','O','P','Q','R','S','T','U','V','W','X','Y','Z') {
+        if (exists($sheet->{'values'}->{$_.'0'})) {
+            push(@exportarray,$sheet->{'values'}->{$_.'0'});
+        } else {
+            push(@exportarray,'');
+        }
+    } 
+    return @exportarray;
 }
 
 
+
+sub update_student_sheet{
+    my ($sheet,$r,$c) = @_;
+    # Load in the studentcalc sheet
+    &readsheet($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($sheet,$r,$c);
+    # Compute the sheet
+    &calcsheet($sheet);
+}
+
 # ========================================================== End of Spreadsheet
 # =============================================================================
-
 #
-# Procedures for screen output
+# Procedures for spreadsheet output
 #
 # --------------------------------------------- Produce output row n from sheet
 
-sub rown {
-    my ($safeeval,$n,$sheetdata)=@_;
-    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>";
-    } else {
-        $rowdata.="\n".'"'.$n.'"';
-    }
-    my $showf=0;
-    my $proc;
-    my $maxred=1;
-    my $sheettype=$sheetdata->{'sheettype'};
-    if ($sheettype eq 'studentcalc') {
-        $proc='&outrowassess';
-        $maxred=26;
-    } else {
-        $proc='&outrow';
-    }
-    if ($sheettype eq 'assesscalc') {
-        $maxred=1;
-    } else {
-        $maxred=26;
-    }
-    if (&getfa($safeeval,$n)=~/^[\~\-]/) { $maxred=1; }
+sub get_row {
+    my ($sheet,$n) = @_;
+    my ($rowlabel,@rowdata);
     if ($n eq '-') { 
-        $proc='&templaterow'; 
-        $n=-1; 
-        $dataflag=1; 
-    }
-    foreach ($safeeval->reval($proc.'('.$n.')')) {
-        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>');
+        ($rowlabel,@rowdata) = &templaterow($sheet);
+    } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
+        ($rowlabel,@rowdata) = &outrowassess($sheet,$n);
     } else {
-        return '';
+        ($rowlabel,@rowdata) = &outrow($sheet,$n);
     }
+    return ($rowlabel,@rowdata);
 }
 
-# ------------------------------------------------------------- Print out sheet
-
-sub outsheet {
-    my ($r,$safeeval,$sheetdata)=@_;
-    my $maxred = 26;    # The maximum number of cells to show as 
-                        # red (uneditable) 
-                        # To make student sheets uneditable could we 
-                        # set $maxred = 52?
-                        #
-    my $realm='Course'; # 'assessment', 'user', or 'course' sheet
-    if ($sheetdata->{'sheettype'} eq 'assesscalc') {
-        $maxred=1;
-        $realm='Assessment';
-    } elsif ($sheetdata->{'sheettype'} eq 'studentcalc') {
-        $maxred=26;
-        $realm='User';
-    }
-    #
-    # 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">'; 
+########################################################################
+########################################################################
+sub sort_indicies {
+    my $sheet = shift;
+    my @sortidx=();
+    #
+    if ($sheet->{'sheettype'} eq 'classcalc') {
+        my @sortby=(undef);
+        # Skip row 0
+        for (my $row=1;$row<=$sheet->{'maxrow'};$row++) {
+            my (undef,$sname,$sdom,$fullname,$section,$id) = 
+                split(':',$sheet->{'rowlabel'}->{$sheet->{'f'}->{'A'.$row}});
+            push (@sortby, lc($fullname));
+            push (@sortidx, $row);
+        }
+        @sortidx = sort { $sortby[$a] cmp $sortby[$b]; } @sortidx;
+    } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
+        my @sortby1=(undef);
+        my @sortby2=(undef);
+        # Skip row 0
+        for (my $row=1;$row<=$sheet->{'maxrow'};$row++) {
+            my ($key,undef) = split(/__&&&\__/,$sheet->{'f'}->{'A'.$row});
+            my $rowlabel = $sheet->{'rowlabel'}->{$key};
+            my (undef,$symb,$mapid,$resid,$title,$ufn) = 
+                split(':',$rowlabel);
+            $ufn   = &Apache::lonnet::unescape($ufn);
+            $symb  = &Apache::lonnet::unescape($symb);
+            $title = &Apache::lonnet::unescape($title);
+            my ($sequence) = ($symb =~ /\/([^\/]*\.sequence)/);
+            if ($sequence eq '') {
+                $sequence = $symb;
+            }
+            push (@sortby1, $sequence);
+            push (@sortby2, $title);
+            push (@sortidx, $row);
+        }
+        @sortidx = sort { $sortby1[$a] cmp $sortby1[$b] || 
+                              $sortby2[$a] cmp $sortby2[$b] } @sortidx;
+    } else {
+        my @sortby=(undef);
+        # Skip row 0
+        for (my $row=1;$row<=$sheet->{'maxrow'};$row++) {
+            push (@sortby, $sheet->{'safe'}->reval('$f{"A'.$row.'"}'));
+            push (@sortidx, $row);
+        }
+        @sortidx = sort { $sortby[$a] cmp $sortby[$b]; } @sortidx;
+    }
+    return @sortidx;
+}
+
+#############################################################
+###                                                       ###
+###              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 '') {
+            $value = '<i>undefined value</i>';
+        }
+    } elsif ($value =~ /^\s*$/ ) {
+        $value = '<font color="'.$bgcolor.'">#</font>';
+    } else {
+        $value = &HTML::Entities::encode($value);
+    }
+    # Make the formula safe for outputting
+    $formula =~ s/\'/\"/g;
+    # The formula will be parsed by the browser *twice* before being 
+    # displayed to the user for editing.
+    $formula = &HTML::Entities::encode(&HTML::Entities::encode($formula));
+    # Escape newlines so they make it into the edit window
+    $formula =~ s/\n/\\n/gs;
+    # Glue everything together
+    $result .= "<a href=\"javascript:celledit(\'".
+        $name."','".$formula."');\">".$value."</a>";
+    return $result;
+}
+
+sub html_uneditable_cell {
+    my ($cell,$bgcolor) = @_;
+    my $value = (defined($cell) ? $cell->{'value'} : '');
+    $value = &HTML::Entities::encode($value);
+    return '&nbsp;'.$value.'&nbsp;';
+}
+
+sub outsheet_html  {
+    my ($sheet,$r) = @_;
+    my ($num_uneditable,$realm,$row_type);
+    my $requester_is_student = ($ENV{'request.role'} =~ /^st\./);
+    if ($sheet->{'sheettype'} eq 'assesscalc') {
+        $num_uneditable = 1;
+        $realm = 'Assessment';
+        $row_type = 'Item';
+    } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
+        $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 ($num_cols_output,$row_html,$rowlabel,@rowdata);
+    
+    if (! $requester_is_student) {
+        ($rowlabel,@rowdata) = &get_row($sheet,'-');
+        $row_html = '<tr><td>'.&format_html_rowlabel($sheet,$rowlabel).'</td>';
+        $num_cols_output = 0;
+        foreach my $cell (@rowdata) {
+            if ($requester_is_student || 
+                $num_cols_output++ < $num_uneditable) {
+                $row_html .= '<td bgcolor="#FFDDDD">';
+                $row_html .= &html_uneditable_cell($cell,'#FFDDDD');
             } else {
-                $tabledata.='<td>';
+                $row_html .= '<td bgcolor="#EOFFDD">';
+                $row_html .= &html_editable_cell($cell,'#E0FFDD');
             }
-            $tabledata.="<b><font size=+1>$_</font></b></td>";
+            $row_html .= '</td>';
         }
-        $tabledata.='</tr>'.&rown($safeeval,'-',$sheetdata).
-            &rown($safeeval,0,$sheetdata);
+        $row_html.= "</tr>\n";
+        $r->print($row_html);
     }
-    $r->print($tabledata);
-    #
-    # Prepare to output rows
-    my $row;
-    my $maxrow=$sheetdata->{'maxrow'};
-    #
-    my @sortby=();
-    my @sortidx=();
-    for ($row=1;$row<=$maxrow;$row++) {
-        push (@sortby, $safeeval->reval('$f{"A'.$row.'"}'));
-        push (@sortidx, $row-1);
-    }
-    @sortidx=sort { lc($sortby[$a]) cmp lc($sortby[$b]); } @sortidx;
-    #
-    # Determine the type of child spreadsheets
-    my $what='Student';
-    if ($sheetdata->{'sheettype'} eq 'assesscalc') {
-        $what='Item';
-    } elsif ($sheetdata->{'sheettype'} eq 'studentcalc') {
-        $what='Assessment';
+    ####################################
+    # Print out summary/export row
+    ####################################
+    ($rowlabel,@rowdata) = &get_row($sheet,'0');
+    $row_html = '<tr><td>'.&format_html_rowlabel($sheet,'Summary').'</td>';
+    $num_cols_output = 0;
+    foreach my $cell (@rowdata) {
+        if ($num_cols_output++ < 26 && ! $requester_is_student) {
+            $row_html .= '<td bgcolor="#CCCCFF">';
+            $row_html .= &html_editable_cell($cell,'#CCCCFF');
+        } else {
+            $row_html .= '<td bgcolor="#DDCCFF">';
+            $row_html .= &html_uneditable_cell($cell,'#CCCCFF');
+        }
+        $row_html .= '</td>';
     }
+    $row_html.= "</tr>\n";
+    $r->print($row_html);
+    $r->print('</table>');
+    ####################################
+    # Prepare to output rows
+    ####################################
+    my @Rows = &sort_indicies($sheet);
     #
     # Loop through the rows and output them one at a time
-    my $n=0;
-    for ($row=0;$row<$maxrow;$row++) {
-        my $thisrow=&rown($safeeval,$sortidx[$row]+1,$sheetdata);
-        if ($thisrow) {
-            if (($n/25==int($n/25)) && (!$ENV{'form.showcsv'})) {
+    my $rows_output=0;
+    foreach my $rownum (@Rows) {
+        my ($rowlabel,@rowdata) = &get_row($sheet,$rownum);
+        next if ($rowlabel =~ /^\s*$/);
+        next if (($sheet->{'sheettype'} eq 'assesscalc') && 
+                 (! $ENV{'form.showall'})                &&
+                 ($rowdata[0]->{'value'} =~ /^\s*$/));
+        if (! $ENV{'form.showall'} &&
+            $sheet->{'sheettype'} =~ /^(studentcalc|classcalc)$/) {
+            my $row_is_empty = 1;
+            foreach my $cell (@rowdata) {
+                if ($cell->{'value'} !~  /^\s*$/) {
+                    $row_is_empty = 0;
+                    last;
+                }
+            }
+            next if ($row_is_empty);
+        }
+        #
+        my $defaultbg='#E0FF';
+        #
+        my $row_html ="\n".'<tr><td><b><font size=+1>'.$rownum.
+            '</font></b></td>';
+        #
+        if ($sheet->{'sheettype'} eq 'classcalc') {
+            $row_html.='<td>'.&format_html_rowlabel($sheet,$rowlabel).'</td>';
+            # Output links for each student?
+            # Nope, that is already done for us in format_html_rowlabel 
+            # (for now)
+        } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
+            my $ufn = (split(/:/,$rowlabel))[5];
+            $row_html.='<td>'.&format_html_rowlabel($sheet,$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') {
+            $row_html.='<td>'.&format_html_rowlabel($sheet,$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 ($requester_is_student || $shown_cells < $num_uneditable) {
+                $row_html .= &html_uneditable_cell($cell,$bgcolor);
+            } else {
+                $row_html .= &html_editable_cell($cell,$bgcolor);
+            }
+            $row_html.='</td>';
+            $shown_cells++;
+        }
+        if ($row_html) {
+            if ($rows_output % 25 == 0) {
                 $r->print("</table>\n<br>\n");
                 $r->rflush();
-                $r->print('<table border=2><tr><td>&nbsp;<td>'.$what.'</td>');
-                $r->print('<td>'.
+                $r->print('<table border=2>'.
+                          '<tr><td>&nbsp;<td>'.$row_type.'</td>'.
+                          '<td>'.
                           join('</td><td>',
                                (split(//,'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
                                       'abcdefghijklmnopqrstuvwxyz'))).
                           "</td></tr>\n");
             }
-            $n++;
-            $r->print($thisrow);
+            $rows_output++;
+            $r->print($row_html);
         }
     }
-    $r->print($ENV{'form.showcsv'}?'</pre>':'</table>');
+    #
+    $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;
 }
 
-#
-# ----------------------------------------------- Read list of available sheets
-# 
+############################################
+##         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($sheet,$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 my $rownum (&sort_indicies($sheet)) {
+        $count++;
+        my ($sname,$sdom) = split(':',$f{'A'.$rownum});
+        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,$r,$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 $label = &format_excel_rowlabel($sheet,$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 $label = &format_excel_rowlabel($sheet,$rowlabel);
+        if ( ! $ENV{'form.showall'} &&
+             $sheet->{'sheettype'} =~ /^(studentcalc|classcalc)$/) {
+            my $row_is_empty = 1;
+            foreach my $cell (@rowdata) {
+                if ($cell->{'value'} !~  /^\s*$/) {
+                    $row_is_empty = 0;
+                    last;
+                }
+            }
+            next if ($row_is_empty);
+        }
+        $worksheet->write($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,$r) = @_;
+    ## Someday XML
+    ## Will be rendered for the user
+    ## But not on this day
+}
+
+##
+## Outsheet - calls other outsheet_* functions
+##
+sub outsheet {
+    my ($sheet,$r)=@_;
+    if (! exists($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,$r);
+    }
+}
+
+########################################################################
+########################################################################
 sub othersheets {
-    my ($safeeval,$stype,$sheetdata)=@_;
+    my ($sheet,$stype)=@_;
+    $stype = $sheet->{'sheettype'} if (! defined($stype));
     #
-    my $cnum  = $sheetdata->{'cnum'};
-    my $cdom  = $sheetdata->{'cdom'};
-    my $chome = $sheetdata->{'chome'};
+    my $cnum  = $sheet->{'cnum'};
+    my $cdom  = $sheet->{'cdom'};
+    my $chome = $sheet->{'chome'};
     #
     my @alternatives=();
     my %results=&Apache::lonnet::dump($stype.'_spreadsheets',$cdom,$cnum);
@@ -1242,7 +1750,6 @@ sub othersheets {
     return @alternatives; 
 }
 
-
 #
 # -------------------------------------- Parse a spreadsheet
 # 
@@ -1275,12 +1782,12 @@ sub parse_sheet {
 # -------------------------------------- Read spreadsheet formulas for a course
 #
 sub readsheet {
-    my ($safeeval,$sheetdata,$fn)=@_;
+    my ($sheet,$fn)=@_;
     #
-    my $stype = $sheetdata->{'sheettype'};
-    my $cnum  = $sheetdata->{'cnum'};
-    my $cdom  = $sheetdata->{'cdom'};
-    my $chome = $sheetdata->{'chome'};
+    my $stype = $sheet->{'sheettype'};
+    my $cnum  = $sheet->{'cnum'};
+    my $cdom  = $sheet->{'cdom'};
+    my $chome = $sheet->{'chome'};
     #
     if (! defined($fn)) {
         # There is no filename. Look for defaults in course and global, cache
@@ -1301,11 +1808,13 @@ sub readsheet {
         }
     }
     # $fn now has a value
-    $sheetdata->{'filename'} = $fn;
+    $sheet->{'filename'} = $fn;
     # see if sheet is cached
     my $fstring='';
     if ($fstring=$spreadsheets{$cnum.'_'.$cdom.'_'.$stype.'_'.$fn}) {
-        &setformulas($safeeval,split(/\_\_\_\;\_\_\_/,$fstring));
+        my %tmp = split(/___;___/,$fstring);
+        $sheet->{'f'} = \%tmp;
+        &setformulas($sheet);
     } else {
         # Not cached, need to read
         my %f=();
@@ -1317,7 +1826,8 @@ sub readsheet {
             if ($fh=Apache::File->new($includedir.'/'.$dfn)) {
                 $sheetxml=join('',<$fh>);
             } else {
-                $sheetxml='<field row="0" col="A">"Error"</field>';
+                # $sheetxml='<field row="0" col="A">"Error"</field>';
+                $sheetxml='<field row="0" col="A"></field>';
             }
             %f=%{&parse_sheet(\$sheetxml)};
         } elsif($fn=~/\/*\.spreadsheet$/) {
@@ -1340,76 +1850,85 @@ sub readsheet {
         }
         # Cache and set
         $spreadsheets{$cnum.'_'.$cdom.'_'.$stype.'_'.$fn}=join('___;___',%f);  
-        &setformulas($safeeval,%f);
+        $sheet->{'f'}=\%f;
+        &setformulas($sheet);
     }
 }
 
 # -------------------------------------------------------- Make new spreadsheet
 sub makenewsheet {
     my ($uname,$udom,$stype,$usymb)=@_;
-    my %sheetdata=();
-    $sheetdata{'uname'} = $uname;
-    $sheetdata{'udom'}  = $udom;
-    $sheetdata{'sheettype'} = $stype;
-    $sheetdata{'usymb'} = $usymb;
-    $sheetdata{'cid'}   = $ENV{'request.course.id'};
-    $sheetdata{'csec'}  = $Section{$uname.':'.$udom};
-    $sheetdata{'coursefilename'}   = $ENV{'request.course.fn'};
-    $sheetdata{'cnum'}  = $ENV{'course.'.$ENV{'request.course.id'}.'.num'};
-    $sheetdata{'cdom'}  = $ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
-    $sheetdata{'chome'} = $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
-    $sheetdata{'uhome'} = &Apache::lonnet::homeserver($uname,$udom);
-    
-    my $safeeval=initsheet($stype);
+    my $sheet={};
+    $sheet->{'uname'} = $uname;
+    $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);
+    #
+    #
+    $sheet->{'f'} = {};
+    $sheet->{'constants'} = {};
+    $sheet->{'othersheets'} = [];
+    $sheet->{'rowlabel'} = {};
     #
-    # Place all the %sheetdata items into the safe space
+    #
+    $sheet->{'safe'}=&initsheet($sheet->{'sheettype'});
+    #
+    # Place all the %$sheet items into the safe space except the safe space
+    # itself
     my $initstring = '';
-    foreach (keys(%sheetdata)) {
-        $initstring.= qq{\$$_="$sheetdata{$_}";};
+    foreach (qw/uname udom sheettype usymb cid csec coursefilename
+             cnum cdom chome uhome/) {
+        $initstring.= qq{\$$_="$sheet->{$_}";};
     }
-    $safeeval->reval($initstring);
-    return $safeeval,\%sheetdata;
+    $sheet->{'safe'}->reval($initstring);
+    return $sheet;
 }
 
 # ------------------------------------------------------------ Save spreadsheet
 sub writesheet {
-    my ($safeeval,$makedef,$sheetdata)=@_;
-    my $cid=$sheetdata->{'cid'};
+    my ($sheet,$makedef)=@_;
+    my $cid=$sheet->{'cid'};
     if (&Apache::lonnet::allowed('opa',$cid)) {
-        my %f=&getformulas($safeeval);
-        my $stype= $sheetdata->{'sheettype'};
-        my $cnum = $sheetdata->{'cnum'};
-        my $cdom = $sheetdata->{'cdom'};
-        my $chome= $sheetdata->{'chome'};
-        my $fn   = $sheetdata->{'filename'};
+        my %f=&getformulas($sheet);
+        my $stype= $sheet->{'sheettype'};
+        my $cnum = $sheet->{'cnum'};
+        my $cdom = $sheet->{'cdom'};
+        my $chome= $sheet->{'chome'};
+        my $fn   = $sheet->{'filename'};
         # Cache new sheet
         $spreadsheets{$cnum.'_'.$cdom.'_'.$stype.'_'.$fn}=join('___;___',%f);
         # Write sheet
-        my $sheetdata='';
         foreach (keys(%f)) {
-            unless ($f{$_} eq 'import') {
-                $sheetdata.=&Apache::lonnet::escape($_).'='.
-                    &Apache::lonnet::escape($f{$_}).'&';
-            }
+            delete($f{$_}) if ($f{$_} eq 'import');
         }
-        $sheetdata=~s/\&$//;
-        my $reply=&Apache::lonnet::reply('put:'.$cdom.':'.$cnum.':'.$fn.':'.
-                                         $sheetdata,$chome);
+        my $reply = &Apache::lonnet::put($fn,\%f,$cdom,$cnum);
         if ($reply eq 'ok') {
-            $reply=&Apache::lonnet::reply('put:'.$cdom.':'.$cnum.':'.
-                                          $stype.'_spreadsheets:'.
-                                          &Apache::lonnet::escape($fn).
-                                          '='.$ENV{'user.name'}.'@'.
-                                          $ENV{'user.domain'},
-                                          $chome);
+            $reply = &Apache::lonnet::put($stype.'_spreadsheets',
+                            {$fn => $ENV{'user.name'}.'@'.$ENV{'user.domain'}},
+                                          $cdom,$cnum);
             if ($reply eq 'ok') {
                 if ($makedef) { 
-                    return &Apache::lonnet::reply('put:'.$cdom.':'.$cnum.
-                                                  ':environment:'.
-                                                  'spreadsheet_default_'.
-                                                  $stype.'='.
-                                                  &Apache::lonnet::escape($fn),
-                                                  $chome);
+                    $reply = &Apache::lonnet::put('environment',
+                                    {'spreadsheet_default_'.$stype => $fn },
+                                                  $cdom,$cnum);
+                    if ($reply eq 'ok' && 
+                        ($sheet->{'sheettype'} eq 'studentcalc' ||
+                         $sheet->{'sheettype'} eq 'assesscalc')) {
+                        # Expire the spreadsheets of the other students.
+                        &Apache::lonnet::expirespread('','','studentcalc','');
+                    }
+                    return $reply;
                 } 
                 return $reply;
             } 
@@ -1424,60 +1943,68 @@ sub writesheet {
 # "Modified workcopy" - interactive only
 #
 sub tmpwrite {
-    my ($safeeval,$sheetdata) = @_;
+    my ($sheet) = @_;
     my $fn=$ENV{'user.name'}.'_'.
-        $ENV{'user.domain'}.'_spreadsheet_'.$sheetdata->{'usymb'}.'_'.
-           $sheetdata->{'filename'};
+        $ENV{'user.domain'}.'_spreadsheet_'.$sheet->{'usymb'}.'_'.
+           $sheet->{'filename'};
     $fn=~s/\W/\_/g;
     $fn=$tmpdir.$fn.'.tmp';
     my $fh;
     if ($fh=Apache::File->new('>'.$fn)) {
-	print $fh join("\n",&getformulas($safeeval));
+        my %f = &getformulas($sheet);
+        while( my ($cell,$formula) = each(%f)) {
+            print $fh &Apache::lonnet::escape($cell)."=".&Apache::lonnet::escape($formula)."\n";
+        }
     }
 }
 
 # ---------------------------------------------------------- Read the temp copy
 sub tmpread {
-    my ($safeeval,$sheetdata,$nfield,$nform)=@_;
+    my ($sheet,$nfield,$nform)=@_;
     my $fn=$ENV{'user.name'}.'_'.
-           $ENV{'user.domain'}.'_spreadsheet_'.$sheetdata->{'usymb'}.'_'.
-           $sheetdata->{'filename'};
+           $ENV{'user.domain'}.'_spreadsheet_'.$sheet->{'usymb'}.'_'.
+           $sheet->{'filename'};
     $fn=~s/\W/\_/g;
     $fn=$tmpdir.$fn.'.tmp';
     my $fh;
     my %fo=();
     my $countrows=0;
     if ($fh=Apache::File->new($fn)) {
-        my $name;
-        while ($name=<$fh>) {
-	    chomp($name);
-            my $value=<$fh>;
-            chomp($value);
-            $fo{$name}=$value;
-            if ($name=~/^A(\d+)$/) {
-		if ($1>$countrows) {
-		    $countrows=$1;
-                }
-            }
+        while (<$fh>) {
+	    chomp;
+            my ($cell,$formula) = split(/=/);
+            $cell    = &Apache::lonnet::unescape($cell);
+            $formula = &Apache::lonnet::unescape($formula);
+            $fo{$cell} = $formula;
         }
     }
+#            chomp($value);
+#            $fo{$name}=$value;
+#            if ($name=~/^A(\d+)$/) {
+#		if ($1>$countrows) {
+#		    $countrows=$1;
+#                }
+#            }
+#        }
+#    }
     if ($nform eq 'changesheet') {
-        $fo{'A'.$nfield}=(split(/\_\_\&\&\&\_\_/,$fo{'A'.$nfield}))[0];
+        $fo{'A'.$nfield}=(split(/__&&&\__/,$fo{'A'.$nfield}))[0];
         unless ($ENV{'form.sel_'.$nfield} eq 'Default') {
 	    $fo{'A'.$nfield}.='__&&&__'.$ENV{'form.sel_'.$nfield};
         }
-    } elsif ($nfield eq 'insertrow') {
-        $countrows++;
-        my $newrow=substr('000000'.$countrows,-7);
-        if ($nform eq 'top') {
-	    $fo{'A'.$countrows}='--- '.$newrow;
-        } else {
-            $fo{'A'.$countrows}='~~~ '.$newrow;
-        }
+#    } elsif ($nfield eq 'insertrow') {
+#        $countrows++;
+#        my $newrow=substr('000000'.$countrows,-7);
+#        if ($nform eq 'top') {
+#	    $fo{'A'.$countrows}='--- '.$newrow;
+#        } else {
+#            $fo{'A'.$countrows}='~~~ '.$newrow;
+#        }
     } else {
        if ($nfield) { $fo{$nfield}=$nform; }
     }
-    &setformulas($safeeval,%fo);
+    $sheet->{'f'}=\%fo;
+    &setformulas($sheet);
 }
 
 ##################################################
@@ -1489,7 +2016,7 @@ sub tmpread {
 
 Determine the value of a parameter.
 
-Inputs: $what, the parameter needed, $safeeval, the safe space
+Inputs: $what, the parameter needed, $sheet, the safe space
 
 Returns: The value of a parameter, or '' if none.
 
@@ -1505,14 +2032,14 @@ this user and course.
 ##################################################
 ##################################################
 sub parmval {
-    my ($what,$safeeval,$sheetdata)=@_;
-    my $symb  = $sheetdata->{'usymb'};
+    my ($what,$sheet)=@_;
+    my $symb  = $sheet->{'usymb'};
     unless ($symb) { return ''; }
     #
-    my $cid   = $sheetdata->{'cid'};
-    my $csec  = $sheetdata->{'csec'};
-    my $uname = $sheetdata->{'uname'};
-    my $udom  = $sheetdata->{'udom'};
+    my $cid   = $sheet->{'cid'};
+    my $csec  = $sheet->{'csec'};
+    my $uname = $sheet->{'uname'};
+    my $udom  = $sheet->{'udom'};
     my $result='';
     #
     my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
@@ -1555,94 +2082,138 @@ sub parmval {
     return &Apache::lonnet::metadata($fn,$rwhat.'.default');
 }
 
+
+##################################################################
+##                  Row label formatting routines               ##
+##################################################################
+sub format_html_rowlabel {
+    my $sheet = shift;
+    my $rowlabel = shift;
+    return '' if ($rowlabel eq '');
+    my ($type,$labeldata) = split(':',$rowlabel,2);
+    my $result = '';
+    if ($type eq 'symb') {
+        my ($symb,$mapid,$resid,$title,$ufn) = split(':',$labeldata);
+        $ufn   = 'default' if (!defined($ufn) || $ufn eq '');
+        $ufn   = &Apache::lonnet::unescape($ufn);
+        $symb  = &Apache::lonnet::unescape($symb);
+        $title = &Apache::lonnet::unescape($title);
+        $result = '<a href="/adm/assesscalc?usymb='.$symb.
+            '&uname='.$sheet->{'uname'}.'&udom='.$sheet->{'udom'}.
+                '&ufn='.$ufn.
+                    '&mapid='.$mapid.'&resid='.$resid.'">'.$title.'</a>';
+    } elsif ($type eq 'student') {
+        my ($sname,$sdom,$fullname,$section,$id) = split(':',$labeldata);
+        if ($fullname =~ /^\s*$/) {
+            $fullname = $sname.'@'.$sdom;
+        }
+        $result ='<a href="/adm/studentcalc?uname='.$sname.
+            '&udom='.$sdom.'">';
+        $result.=$section.'&nbsp;'.$id."&nbsp;".$fullname.'</a>';
+    } elsif ($type eq 'parameter') {
+        $result = $labeldata;
+    } else {
+        $result = '<b><font size=+1>'.$rowlabel.'</font></b>';
+    }
+    return $result;
+}
+
+sub format_csv_rowlabel {
+    my $sheet = shift;
+    my $rowlabel = shift;
+    return '' if ($rowlabel eq '');
+    my ($type,$labeldata) = split(':',$rowlabel,2);
+    my $result = '';
+    if ($type eq 'symb') {
+        my ($symb,$mapid,$resid,$title,$ufn) = split(':',$labeldata);
+        $ufn   = &Apache::lonnet::unescape($ufn);
+        $symb  = &Apache::lonnet::unescape($symb);
+        $title = &Apache::lonnet::unescape($title);
+        $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 $sheet = shift;
+    my $rowlabel = shift;
+    return '' if ($rowlabel eq '');
+    my ($type,$labeldata) = split(':',$rowlabel,2);
+    my $result = '';
+    if ($type eq 'symb') {
+        my ($symb,$mapid,$resid,$title,$ufn) = split(':',$labeldata);
+        $ufn   = &Apache::lonnet::unescape($ufn);
+        $symb  = &Apache::lonnet::unescape($symb);
+        $title = &Apache::lonnet::unescape($title);
+        $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 $result;
+}
+
 # ---------------------------------------------- Update rows for course listing
 sub updateclasssheet {
-    my ($safeeval,$sheetdata) = @_;
-    my $cnum  =$sheetdata->{'cnum'};
-    my $cdom  =$sheetdata->{'cdom'};
-    my $cid   =$sheetdata->{'cid'};
-    my $chome =$sheetdata->{'chome'};
+    my ($sheet) = @_;
+    my $cnum  =$sheet->{'cnum'};
+    my $cdom  =$sheet->{'cdom'};
+    my $cid   =$sheet->{'cid'};
+    my $chome =$sheet->{'chome'};
     #
     %Section = ();
-
     #
     # Read class list and row labels
-    my %classlist;
-    my @tmp = &Apache::lonnet::dump('classlist',$cdom,$cnum);
-    if ($tmp[0] !~ /^error/) {
-        %classlist = @tmp;
-    } else {
-        return 'Could not access course data';
-    }
-    undef @tmp;
+    my $classlist = &Apache::loncoursedata::get_classlist();
+    if (! defined($classlist)) {
+        return 'Could not access course classlist';
+    } 
     #
     my %currentlist=();
-    my $now=time;
-    foreach my $student (keys(%classlist)) {
-        my ($end,$start)=split(/\:/,$classlist{$student});
-        my $active=1;
-        $active = 0 if (($end) && ($now>$end));
-        $active = 1 if ($ENV{'form.Status'} eq 'Any');
-        $active = !$active if ($ENV{'form.Status'} eq 'Expired');
-        if ($active) {
-            my $rowlabel='';
-            my ($studentName,$studentDomain)=split(/\:/,$student);
-            my $studentSection=&Apache::lonnet::usection($studentDomain,
-                                                         $studentName,$cid);
-            $Section{$studentName.':'.$studentDomain} = $studentSection;
-#            if ($studentSection==-1) {
-#                unless ($ENV{'form.showcsv'}) {
-#                    $rowlabel='<font color=red>Data not available: '.
-#                        $studentName.'</font>';
-#                } else {
-#                    $rowlabel='ERROR","'.$studentName.
-#                        '","Data not available","","","';
-#                }
-#            } else {
-                my %reply=&Apache::lonnet::idrget($studentDomain,$studentName);
-                my %studentInformation=&Apache::lonnet::get
-                    ('environment',
-                     ['lastname','generation','firstname','middlename','id'],
-                     $studentDomain,$studentName);
-                if (! $ENV{'form.showcsv'}) {
-                    $rowlabel='<a href="/adm/studentcalc?uname='.$studentName.
-                        '&udom='.$studentDomain.'">'.
-                            $studentSection.'&nbsp;';
-                    foreach ('id','firstname','middlename',
-                             'lastname','generation'){
-                        $rowlabel.=$studentInformation{$_}."&nbsp;";
-                    }
-                    $rowlabel.='</a>';
-                } else {
-                    $rowlabel= '"'.join('","',
-                                        ($studentSection,
-                                         $studentInformation{'id'},
-                                         $studentInformation{'firstname'},
-                                         $studentInformation{'middlename'},
-                                         $studentInformation{'lastname'},
-                                         $studentInformation{'generation'})
-                                        ).'"';
-                }
- #           }
-            $currentlist{$student}=$rowlabel;
-        } # end of if ($active)
-    } # end of foreach my $student (keys(%classlist))
+    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,
+                                             $studentSection,$id));
+        }
+    }
     #
     # Find discrepancies between the course row table and this
     #
-    my %f=&getformulas($safeeval);
+    my %f=&getformulas($sheet);
     my $changed=0;
     #
-    my $maxrow=0;
+    $sheet->{'maxrow'}=0;
     my %existing=();
     #
     # Now obsolete rows
     foreach (keys(%f)) {
         if ($_=~/^A(\d+)/) {
-            $maxrow=($1>$maxrow)?$1:$maxrow;
+            if ($1 > $sheet->{'maxrow'}) {
+                $sheet->{'maxrow'}= $1;
+            }
             $existing{$f{$_}}=1;
             unless ((defined($currentlist{$f{$_}})) || (!$1) ||
-                    ($f{$_}=~/^(\~\~\~|\-\-\-)/)) {
+                    ($f{$_}=~/^(~~~|---)/)) {
                 $f{$_}='!!! Obsolete';
                 $changed=1;
             }
@@ -1650,79 +2221,117 @@ sub updateclasssheet {
     }
     #
     # New and unknown keys
-    foreach (sort keys(%currentlist)) {
-        unless ($existing{$_}) {
+    foreach my $student (sort keys(%currentlist)) {
+        unless ($existing{$student}) {
             $changed=1;
-            $maxrow++;
-            $f{'A'.$maxrow}=$_;
+            $sheet->{'maxrow'}++;
+            $f{'A'.$sheet->{'maxrow'}}=$student;
         }
     }
-    if ($changed) { &setformulas($safeeval,%f); }
+    if ($changed) { 
+        $sheet->{'f'} = \%f;
+        &setformulas($sheet,%f); 
+    }
     #
-    $sheetdata->{'maxrow'} = $maxrow;
-    &setrowlabels($safeeval,%currentlist);
+    &setrowlabels($sheet,\%currentlist);
 }
 
 # ----------------------------------- Update rows for student and assess sheets
-sub updatestudentassesssheet {
-    my ($safeeval,$sheetdata) = @_;
-    my %bighash;
-    my $stype=$sheetdata->{'sheettype'};
-    my $uname=$sheetdata->{'uname'};
-    my $udom =$sheetdata->{'udom'};
-    my %current=();
-    if  ($updatedata
-         {$ENV{'request.course.fn'}.'_'.$stype.'_'.$uname.'_'.$udom}) {
-        %current=split(/\_\_\_\;\_\_\_/,
-                       $updatedata{$ENV{'request.course.fn'}.
-                                       '_'.$stype.'_'.$uname.'_'.$udom});
+sub get_student_rowlabels {
+    my ($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(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
+        tie(%course_db,'GDBM_File',$sheet->{'coursefilename'}.'.db',
             &GDBM_READER(),0640);
-        if (! tied(%bighash)) {
+        if (! tied(%course_db)) {
             return 'Could not access course data';
         }
-        # Get all assessments
-        my %allkeys=('timestamp' => 
-                     'Timestamp of Last Transaction<br>timestamp',
-                     'subnumber' =>
-                     'Number of Submissions<br>subnumber',
-                     'tutornumber' =>
-                     'Number of Tutor Responses<br>tutornumber',
-                     'totalpoints' =>
-                     'Total Points Granted<br>totalpoints');
-        my $adduserstr='';
-        if (($uname ne $ENV{'user.name'}) || ($udom ne $ENV{'user.domain'})){
-            $adduserstr='&uname='.$uname.'&udom='.$udom;
-        }
-        my %allassess =
-            ('_feedback' =>'<a href="/adm/assesscalc?usymb=_feedback'.
-             $adduserstr.'">Feedback</a>',
-             '_evaluation' =>'<a href="/adm/assesscalc?usymb=_evaluation'.
-             $adduserstr.'">Evaluation</a>',
-             '_tutoring' =>'<a href="/adm/assesscalc?usymb=_tutoring'.
-             $adduserstr.'">Tutoring</a>',
-             '_discussion' =>'<a href="/adm/assesscalc?usymb=_discussion'.
-             $adduserstr.'">Discussion</a>'
-             );
-        while (($_,undef) = each(%bighash)) {
-            next if ($_!~/^src\_(\d+)\.(\d+)$/);
-            my $mapid=$1;
-            my $resid=$2;
-            my $id=$mapid.'.'.$resid;
-            my $srcf=$bighash{$_};
+        #
+        my %assesslist = ();
+        foreach ('Feedback','Evaluation','Tutoring','Discussion') {
+            my $symb = '_'.lc($_);
+            $assesslist{$symb} = join(':',('symb',$symb,0,0,
+                                           &Apache::lonnet::escape($_)));
+        }
+        #
+        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_'.$mapid}).
+                    &Apache::lonnet::declutter($course_db{'map_id_'.$mapid}).
                         '___'.$resid.'___'.&Apache::lonnet::declutter($srcf);
-                $allassess{$symb}=
-                    '<a href="/adm/assesscalc?usymb='.$symb.$adduserstr.'">'.
-                        $bighash{'title_'.$id}.'</a>';
-                next if ($stype ne 'assesscalc');
-                foreach my $key (split(/\,/,
-                                       &Apache::lonnet::metadata($srcf,'keys')
-                                       )) {
+                $assesslist{$symb} ='symb:'.&Apache::lonnet::escape($symb).':'
+                    .$mapid.':'.$resid.':'.
+                        &Apache::lonnet::escape($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';
+        }
+        #
+        my %parameter_labels=
+            ('timestamp' => 
+                 'parameter:Timestamp of Last Transaction<br>timestamp',
+             'subnumber' =>
+                 'parameter:Number of Submissions<br>subnumber',
+             'tutornumber' =>
+                 'parameter:Number of Tutor Responses<br>tutornumber',
+             'totalpoints' =>
+                 'parameter:Total Points Granted<br>totalpoints');
+        while (my ($key,$srcf) = each(%course_db)) {
+            next if ($key !~ /^src_(\d+)\.(\d+)$/);
+            my $mapid = $1;
+            my $resid = $2;
+            my $id   = $mapid.'.'.$resid;
+            if ($srcf=~/\.(problem|exam|quiz|assess|survey|form)$/) {
+                # 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,$key.'.display');
@@ -1731,73 +2340,70 @@ sub updatestudentassesssheet {
                             &Apache::lonnet::metadata($srcf,$key.'.name');
                     }
                     $display.='<br>'.$key;
-                    $allkeys{$key}=$display;
+                    $parameter_labels{$key}='parameter:'.$display;
                 } # end of foreach
             }
-        } # end of foreach (keys(%bighash))
-        untie(%bighash);
-        #
-        # %allkeys has a list of storage and parameter displays by unikey
-        # %allassess has a list of all resource displays by symb
-        #
-        if ($stype eq 'assesscalc') {
-            %current=%allkeys;
-        } elsif ($stype eq 'studentcalc') {
-            %current=%allassess;
-        }
-        $updatedata{$ENV{'request.course.fn'}.'_'.$stype.'_'.$uname.'_'.$udom}=
-            join('___;___',%current);
-        # Get current from cache
+        }
+        untie(%course_db);
+        # Store away the results
+        $sheet->{'rowlabel'} = \%parameter_labels;
+        $rowlabel_cache{$identifier}=join('___;___',%{$sheet->{'rowlabel'}});
     }
-    # Find discrepancies between the course row table and this
-    #
-    my %f=&getformulas($safeeval);
+        
+}
+
+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;
     
-    my $maxrow=0;
+    $sheet->{'maxrow'} = 0;
     my %existing=();
     # Now obsolete rows
-    foreach (keys(%f)) {
-        next if ($_!~/^A(\d+)/);
-        $maxrow=($1>$maxrow)?$1:$maxrow;
-        my ($usy,$ufn)=split(/\_\_\&\&\&\_\_/,$f{$_});
+    foreach my $cell (keys(%f)) {
+        my $formula = $f{$cell};
+        next if ($cell !~ /^A(\d+)/);
+        $sheet->{'maxrow'} = $1 if ($1 > $sheet->{'maxrow'});
+        my ($usy,$ufn)=split(/__&&&\__/,$formula);
         $existing{$usy}=1;
-        unless ((defined($current{$usy})) || (!$1) ||
-                ($f{$_}=~/^(\~\~\~|\-\-\-)/)){
+        unless ((exists($sheet->{'rowlabel'}->{$usy}) && 
+                 (defined($sheet->{'rowlabel'}->{$usy})) || (!$1) ||
+                 ($formula =~ /^(~~~|---)/) )) {
             $f{$_}='!!! Obsolete';
             $changed=1;
-        } elsif ($ufn) {
-            $current{$usy}
-            =~s/assesscalc\?usymb\=/assesscalc\?ufn\=$ufn\&usymb\=/;
         }
     }
     # New and unknown keys
-    foreach (keys(%current)) {
+    foreach (keys(%{$sheet->{'rowlabel'}})) {
         unless ($existing{$_}) {
             $changed=1;
-            $maxrow++;
-            $f{'A'.$maxrow}=$_;
+            $sheet->{'maxrow'}++;
+            $f{'A'.$sheet->{'maxrow'}}=$_;
         }
     }
-    if ($changed) { &setformulas($safeeval,%f); }
-    $sheetdata->{'maxrow'} = $maxrow;
-    &setrowlabels($safeeval,%current);
-    #
-    undef %current;
-    undef %existing;
+    if ($changed) { 
+        $sheet->{'f'} = \%f;
+        &setformulas($sheet); 
+    }
 }
 
 # ------------------------------------------------ Load data for one assessment
 
-sub loadstudent {
-    my ($safeeval,$sheetdata)=@_;
-    my %c=();
-    my %f=&getformulas($safeeval);
-    $cachedassess=$sheetdata->{'uname'}.':'.$sheetdata->{'udom'};
+sub loadstudent{
+    my ($sheet,$r,$c)=@_;
+    my %constants=();
+    my %formulas=&getformulas($sheet);
+    $cachedassess=$sheet->{'uname'}.':'.$sheet->{'udom'};
     # Get ALL the student preformance data
-    my @tmp = &Apache::lonnet::dump($sheetdata->{'cid'},
-                                    $sheetdata->{'udom'},
-                                    $sheetdata->{'uname'},
+    my @tmp = &Apache::lonnet::dump($sheet->{'cid'},
+                                    $sheet->{'udom'},
+                                    $sheet->{'uname'},
                                     undef);
     if ($tmp[0] !~ /^error:/) {
         %cachedstores = @tmp;
@@ -1805,47 +2411,51 @@ sub loadstudent {
     undef @tmp;
     # 
     my @assessdata=();
-    foreach (keys(%f)) {
-	next if ($_!~/^A(\d+)/);
+    foreach my $cell (keys(%formulas)) {
+        my $value = $formulas{$cell};
+        if(defined($c) && ($c->aborted())) {
+            last;
+        }
+	next if ($cell !~ /^A(\d+)/);
         my $row=$1;
-        next if (($f{$_}=~/^[\!\~\-]/) || ($row==0));
-        my ($usy,$ufn)=split(/__&&&\__/,$f{$_});
-        @assessdata=&exportsheet($sheetdata->{'uname'},
-                                 $sheetdata->{'udom'},
-                                 'assesscalc',$usy,$ufn);
+        next if (($value =~ /^[!~-]/) || ($row==0));
+        my ($usy,$ufn)=split(/__&&&\__/,$value);
+        @assessdata=&exportsheet($sheet,$sheet->{'uname'},
+                                 $sheet->{'udom'},
+                                 'assesscalc',$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]) {
-                my $col=$_;
+        foreach my $col ('A','B','C','D','E','F','G','H','I','J','K','L','M',
+                         'N','O','P','Q','R','S','T','U','V','W','X','Y','Z') {
+            if (defined($assessdata[$index])) {
                 if ($assessdata[$index]=~/\D/) {
-                    $c{$col.$row}="'".$assessdata[$index]."'";
+                    $constants{$col.$row}="'".$assessdata[$index]."'";
                 } else {
-                    $c{$col.$row}=$assessdata[$index];
-                }
-                unless ($col eq 'A') { 
-                    $f{$col.$row}='import';
+                    $constants{$col.$row}=$assessdata[$index];
                 }
+                $formulas{$col.$row}='import' if ($col ne 'A');
             }
             $index++;
         }
     }
     $cachedassess='';
     undef %cachedstores;
-    &setformulas($safeeval,%f);
-    &setconstants($safeeval,%c);
+    $sheet->{'f'} = \%formulas;
+    &setformulas($sheet);
+    &setconstants($sheet,\%constants);
 }
 
 # --------------------------------------------------- Load data for one student
 #
 sub loadcourse {
-    my ($safeeval,$sheetdata,$r)=@_;
-    my %c=();
-    my %f=&getformulas($safeeval);
+    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;
@@ -1862,12 +2472,16 @@ 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 @studentdata=&exportsheet(split(/\:/,$f{$_}),
-                                     '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="'.
@@ -1878,22 +2492,23 @@ ENDPOP
         my $index=0;
         foreach ('A','B','C','D','E','F','G','H','I','J','K','L','M',
                  'N','O','P','Q','R','S','T','U','V','W','X','Y','Z') {
-            if ($studentdata[$index]) {
+            if (defined($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++;
-            }
+            } 
+            $index++;
         }
     }
-    &setformulas($safeeval,%f);
-    &setconstants($safeeval,%c);
+    $sheet->{'f'}=\%formulas;
+    &setformulas($sheet);
+    &setconstants($sheet,\%constants);
     $r->print('<script>popwin.close()</script>');
     $r->rflush(); 
 }
@@ -1901,16 +2516,16 @@ ENDPOP
 # ------------------------------------------------ Load data for one assessment
 #
 sub loadassessment {
-    my ($safeeval,$sheetdata)=@_;
+    my ($sheet,$r,$c)=@_;
 
-    my $uhome = $sheetdata->{'uhome'};
-    my $uname = $sheetdata->{'uname'};
-    my $udom  = $sheetdata->{'udom'};
-    my $symb  = $sheetdata->{'usymb'};
-    my $cid   = $sheetdata->{'cid'};
-    my $cnum  = $sheetdata->{'cnum'};
-    my $cdom  = $sheetdata->{'cdom'};
-    my $chome = $sheetdata->{'chome'};
+    my $uhome = $sheet->{'uhome'};
+    my $uname = $sheet->{'uname'};
+    my $udom  = $sheet->{'udom'};
+    my $symb  = $sheet->{'usymb'};
+    my $cid   = $sheet->{'cid'};
+    my $cnum  = $sheet->{'cnum'};
+    my $cdom  = $sheet->{'cdom'};
+    my $chome = $sheet->{'chome'};
 
     my $namespace;
     unless ($namespace=$cid) { return ''; }
@@ -1995,29 +2610,29 @@ sub loadassessment {
     #
     my %c=();
     if (tie(%parmhash,'GDBM_File',
-            $sheetdata->{'coursefilename'}.'_parms.db',&GDBM_READER(),0640)) {
-        my %f=&getformulas($safeeval);
-        foreach (keys(%f))  {
-            next if ($_!~/^A/);
-            next if  ($f{$_}=~/^[\!\~\-]/);
-            if ($f{$_}=~/^parameter/) {
-                if ($thisassess{$f{$_}}) {
-                    my $val=&parmval($f{$_},$safeeval,$sheetdata);
-                    $c{$_}=$val;
-                    $c{$f{$_}}=$val;
+            $sheet->{'coursefilename'}.'_parms.db',&GDBM_READER(),0640)) {
+        my %f=&getformulas($sheet);
+        foreach my $cell (keys(%f))  {
+            next if ($cell !~ /^A/);
+            next if  ($f{$cell} =~/^[\!\~\-]/);
+            if ($f{$cell}=~/^parameter/) {
+                if (defined($thisassess{$f{$cell}})) {
+                    my $val       = &parmval($f{$cell},$sheet);
+                    $c{$cell}     = $val;
+                    $c{$f{$cell}} = $val;
                 }
             } else {
-                my $key=$f{$_};
+                my $key=$f{$cell};
                 my $ckey=$key;
                 $key=~s/^stores\_/resource\./;
                 $key=~s/\_/\./g;
-                $c{$_}=$returnhash{$key};
+                $c{$cell}=$returnhash{$key};
                 $c{$ckey}=$returnhash{$key};
             }
         }
         untie(%parmhash);
     }
-    &setconstants($safeeval,%c);
+    &setconstants($sheet,\%c);
 }
 
 # --------------------------------------------------------- Various form fields
@@ -2050,12 +2665,11 @@ sub selectbox {
 #
 
 sub updatesheet {
-    my ($safeeval,$sheetdata)=@_;
-    my $stype=$sheetdata->{'sheettype'};
-    if ($stype eq 'classcalc') {
-	return &updateclasssheet($safeeval,$sheetdata);
+    my ($sheet)=@_;
+    if ($sheet->{'sheettype'} eq 'classcalc') {
+	return &updateclasssheet($sheet);
     } else {
-        return &updatestudentassesssheet($safeeval,$sheetdata);
+        return &updatestudentassesssheet($sheet);
     }
 }
 
@@ -2065,14 +2679,15 @@ sub updatesheet {
 #
 
 sub loadrows {
-    my ($safeeval,$sheetdata,$r)=@_;
-    my $stype=$sheetdata->{'sheettype'};
+    my ($sheet,$r)=@_;
+    my $c = $r->connection;
+    my $stype=$sheet->{'sheettype'};
     if ($stype eq 'classcalc') {
-	&loadcourse($safeeval,$sheetdata,$r);
+	&loadcourse($sheet,$r,$c);
     } elsif ($stype eq 'studentcalc') {
-        &loadstudent($safeeval,$sheetdata);
+        &loadstudent($sheet,$r,$c);
     } else {
-        &loadassessment($safeeval,$sheetdata);
+        &loadassessment($sheet,$r,$c);
     }
 }
 
@@ -2080,7 +2695,11 @@ sub loadrows {
 
 sub checkthis {
     my ($keyname,$time)=@_;
-    return ($time<$expiredates{$keyname});
+    if (! exists($expiredates{$keyname})) {
+        return 0;
+    } else {
+        return ($time<$expiredates{$keyname});
+    }
 }
 
 sub forcedrecalc {
@@ -2090,7 +2709,7 @@ sub forcedrecalc {
     if ($ENV{'form.forcerecalc'}) { return 1; }
     unless ($time) { return 1; }
     if ($stype eq 'assesscalc') {
-        my $map=(split(/\_\_\_/,$usymb))[0];
+        my $map=(split(/___/,$usymb))[0];
         if (&checkthis('::assesscalc:',$time) ||
             &checkthis('::assesscalc:'.$map,$time) ||
             &checkthis('::assesscalc:'.$usymb,$time) ||
@@ -2098,7 +2717,7 @@ sub forcedrecalc {
             &checkthis($uname.':'.$udom.':assesscalc:'.$map,$time) ||
             &checkthis($uname.':'.$udom.':assesscalc:'.$usymb,$time)) {
             return 1;
-        } 
+        }
     } else {
         if (&checkthis('::studentcalc:',$time) || 
             &checkthis($uname.':'.$udom.':studentcalc:',$time)) {
@@ -2109,14 +2728,19 @@ sub forcedrecalc {
 }
 
 # ============================================================== Export handler
+# exportsheet
+# returns the export row for a spreadsheet.
 #
-# Non-interactive call from with program
-#
-
 sub exportsheet {
-    my ($uname,$udom,$stype,$usymb,$fn)=@_;
+    my ($sheet,$uname,$udom,$stype,$usymb,$fn,$r)=@_;
+    my $flag = 0;
+    $uname = $uname || $sheet->{'uname'};
+    $udom  = $udom  || $sheet->{'udom'};
+    $stype = $stype || $sheet->{'sheettype'};
     my @exportarr=();
-    if (($usymb=~/^\_(\w+)/) && (!$fn)) {
+    # This handles the assessment sheets for '_feedback', etc
+    if (defined($usymb) && ($usymb=~/^\_(\w+)/) && 
+        (!defined($fn) || $fn eq '')) {
         $fn='default_'.$1;
     }
     #
@@ -2125,18 +2749,18 @@ sub exportsheet {
     my $key=$uname.':'.$udom.':'.$stype.':'.$usymb;
     my $found='';
     if ($oldsheets{$key}) {
-        foreach (split(/\_\_\_\&\_\_\_/,$oldsheets{$key})) {
-            my ($name,$value)=split(/\_\_\_\=\_\_\_/,$_);
+        foreach (split(/___&\___/,$oldsheets{$key})) {
+            my ($name,$value)=split(/___=___/,$_);
             if ($name eq $fn) {
                 $found=$value;
             }
         }
     }
     unless ($found) {
-        &cachedssheets($uname,$udom,&Apache::lonnet::homeserver($uname,$udom));
+        &cachedssheets($sheet,$uname,$udom);
         if ($oldsheets{$key}) {
-            foreach (split(/\_\_\_\&\_\_\_/,$oldsheets{$key})) {
-                my ($name,$value)=split(/\_\_\_\=\_\_\_/,$_);
+            foreach (split(/___&\___/,$oldsheets{$key})) {
+                my ($name,$value)=split(/___=___/,$_);
                 if ($name eq $fn) {
                     $found=$value;
                 }
@@ -2155,73 +2779,80 @@ sub exportsheet {
         #
         # Return what was cached
         #
-        @exportarr=split(/\_\_\_\;\_\_\_/,$found);
-    } else {
-        #
-        # Not cached
-        #        
-        my ($thissheet,$sheetdata)=&makenewsheet($uname,$udom,$stype,$usymb);
-        &readsheet($thissheet,$sheetdata,$fn);
-        &updatesheet($thissheet,$sheetdata);
-        &loadrows($thissheet,$sheetdata);
-        &calcsheet($thissheet); 
-        @exportarr=&exportdata($thissheet);
-        #
-        # Store now
-        #
-        my $cid=$ENV{'request.course.id'}; 
-        my $current='';
-        if ($stype eq 'studentcalc') {
-            $current=&Apache::lonnet::reply('get:'.
-                                            $ENV{'course.'.$cid.'.domain'}.':'.
-                                            $ENV{'course.'.$cid.'.num'}.
-                                            ':nohist_calculatedsheets:'.
-                                            &Apache::lonnet::escape($key),
-                                            $ENV{'course.'.$cid.'.home'});
-        } else {
-            $current=&Apache::lonnet::reply('get:'.$sheetdata->{'udom'}.':'.
-                                            $sheetdata->{'uname'}.
-                                            ':nohist_calculatedsheets_'.
-                                            $ENV{'request.course.id'}.':'.
-                                            &Apache::lonnet::escape($key),
-                                            $sheetdata->{'uhome'});
-        }
-        my %currentlystored=();
-        unless ($current=~/^error\:/) {
-            foreach (split(/___&\___/,&Apache::lonnet::unescape($current))) {
-                my ($name,$value)=split(/___=___/,$_);
-                $currentlystored{$name}=$value;
+        @exportarr=split(/___;___/,$found);
+        return @exportarr;
+    }
+    #
+    # Not cached
+    #
+    my ($newsheet)=&makenewsheet($uname,$udom,$stype,$usymb);
+    &readsheet($newsheet,$fn);
+    &updatesheet($newsheet);
+    &loadrows($newsheet,$r);
+    &calcsheet($newsheet); 
+    @exportarr=&exportdata($newsheet);
+    ##
+    ## Store now
+    ##
+    #
+    # load in the old value
+    #
+    my %currentlystored=();
+    if ($stype eq 'studentcalc') {
+        my @tmp = &Apache::lonnet::get('nohist_calculatedsheets',
+                                       [$key],
+                                       $sheet->{'cdom'},$sheet->{'cnum'});
+        if ($tmp[0]!~/^error/) {
+            # We only got one key, so we will access it directly.
+            foreach (split('___&___',$tmp[1])) {
+                my ($key,$value) = split('___=___',$_);
+                $key = '' if (! defined($key));
+                $currentlystored{$key} = $value;
             }
         }
-        $currentlystored{$fn}=join('___;___',@exportarr);
-        #
-        my $newstore='';
-        foreach (keys(%currentlystored)) {
-            if ($newstore) { $newstore.='___&___'; }
-            $newstore.=$_.'___=___'.$currentlystored{$_};
-        }
-        my $now=time;
-        if ($stype eq 'studentcalc') {
-            &Apache::lonnet::reply('put:'.
-                                   $ENV{'course.'.$cid.'.domain'}.':'.
-                                   $ENV{'course.'.$cid.'.num'}.
-                                   ':nohist_calculatedsheets:'.
-                                   &Apache::lonnet::escape($key).'='.
-                                   &Apache::lonnet::escape($newstore).'&'.
-                                   &Apache::lonnet::escape($key).'.time='.$now,
-                                   $ENV{'course.'.$cid.'.home'});
-        } else {
-            &Apache::lonnet::reply('put:'.
-                                   $sheetdata->{'udom'}.':'.
-                                   $sheetdata->{'uname'}.
-                                   ':nohist_calculatedsheets_'.
-                                   $ENV{'request.course.id'}.':'.
-                                   &Apache::lonnet::escape($key).'='.
-                                   &Apache::lonnet::escape($newstore).'&'.
-                                   &Apache::lonnet::escape($key).'.time='.$now,
-                                   $sheetdata->{'uhome'});
+    } else {
+        my @tmp = &Apache::lonnet::get('nohist_calculatedsheets_'.
+                                       $sheet->{'cid'},[$key],
+                                       $sheet->{'udom'},$sheet->{'uname'});
+        if ($tmp[0]!~/^error/) {
+            # We only got one key, so we will access it directly.
+            foreach (split('___&___',$tmp[1])) {
+                my ($key,$value) = split('___=___',$_);
+                $key = '' if (! defined($key));
+                $currentlystored{$key} = $value;
+            }
         }
     }
+    #
+    # Add the new line
+    #
+    $currentlystored{$fn}=join('___;___',@exportarr);
+    #
+    # Stick everything back together
+    #
+    my $newstore='';
+    foreach (keys(%currentlystored)) {
+        if ($newstore) { $newstore.='___&___'; }
+        $newstore.=$_.'___=___'.$currentlystored{$_};
+    }
+    my $now=time;
+    #
+    # Store away the new value
+    #
+    my $timekey = $key.'.time';
+    if ($stype eq 'studentcalc') {
+        my $result = &Apache::lonnet::put('nohist_calculatedsheets',
+                                          { $key     => $newstore,
+                                            $timekey => $now },
+                                          $sheet->{'cdom'},
+                                          $sheet->{'cnum'});
+    } else {
+        my $result = &Apache::lonnet::put('nohist_calculatedsheets_'.$sheet->{'cid'},
+                                          { $key     => $newstore,
+                                            $timekey => $now },
+                                          $sheet->{'udom'},
+                                          $sheet->{'uname'});
+    }
     return @exportarr;
 }
 
@@ -2229,20 +2860,14 @@ 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 $reply=&Apache::lonnet::reply('dump:'.
-				     $ENV{'course.'.$cid.'.domain'}.':'.
-                                     $ENV{'course.'.$cid.'.num'}.
-				     ':nohist_expirationdates',
-                                     $ENV{'course.'.$cid.'.home'});
-    unless ($reply=~/^error\:/) {
-	foreach (split(/\&/,$reply)) {
-            my ($name,$value)=split(/\=/,$_);
-            $expiredates{&Apache::lonnet::unescape($name)}
-                        =&Apache::lonnet::unescape($value);
-        }
+    my @tmp = &Apache::lonnet::dump('nohist_expirationdates',
+                                    $ENV{'course.'.$cid.'.domain'},
+                                    $ENV{'course.'.$cid.'.num'});
+    if (lc($tmp[0]) !~ /^error/){
+        %expiredates = @tmp;
     }
 }
 
@@ -2253,16 +2878,13 @@ sub expirationdates {
 
 sub cachedcsheets {
     my $cid=$ENV{'request.course.id'};
-    my $reply=&Apache::lonnet::reply('dump:'.
-				     $ENV{'course.'.$cid.'.domain'}.':'.
-                                     $ENV{'course.'.$cid.'.num'}.
-				     ':nohist_calculatedsheets',
-                                     $ENV{'course.'.$cid.'.home'});
-    unless ($reply=~/^error\:/) {
-	foreach ( split(/\&/,$reply)) {
-            my ($name,$value)=split(/\=/,$_);
-            $oldsheets{&Apache::lonnet::unescape($name)}
-                      =&Apache::lonnet::unescape($value);
+    my @tmp = &Apache::lonnet::dump('nohist_calculatedsheets',
+                                    $ENV{'course.'.$cid.'.domain'},
+                                    $ENV{'course.'.$cid.'.num'});
+    if ($tmp[0] !~ /^error/) {
+        my %StupidTempHash = @tmp;
+        while (my ($key,$value) = each %StupidTempHash) {
+            $oldsheets{$key} = $value;
         }
     }
 }
@@ -2273,22 +2895,24 @@ sub cachedcsheets {
 #
 
 sub cachedssheets {
-  my ($sname,$sdom,$shome)=@_;
-  unless (($loadedcaches{$sname.'_'.$sdom}) || ($shome eq 'no_host')) {
-    my $cid=$ENV{'request.course.id'};
-    my $reply=&Apache::lonnet::reply('dump:'.$sdom.':'.$sname.
-			             ':nohist_calculatedsheets_'.
-                                      $ENV{'request.course.id'},
-                                     $shome);
-    unless ($reply=~/^error\:/) {
-	foreach ( split(/\&/,$reply)) {
-            my ($name,$value)=split(/\=/,$_);
-            $oldsheets{&Apache::lonnet::unescape($name)}
-                      =&Apache::lonnet::unescape($value);
+    my ($sheet,$uname,$udom) = @_;
+    $uname = $uname || $sheet->{'uname'};
+    $udom  = $udom  || $sheet->{'udom'};
+    if (! $loadedcaches{$uname.'_'.$udom}) {
+        my @tmp = &Apache::lonnet::dump('nohist_calculatedsheets',
+                                        $sheet->{'udom'},
+                                        $sheet->{'uname'});
+        if ($tmp[0] !~ /^error/) {
+            my %TempHash = @tmp;
+            my $count = 0;
+            while (my ($key,$value) = each %TempHash) {
+                $oldsheets{$key} = $value;
+                $count++;
+            }
+            $loadedcaches{$sheet->{'uname'}.'_'.$sheet->{'udom'}}=1;
         }
     }
-    $loadedcaches{$sname.'_'.$sdom}=1;
-  }
+    
 }
 
 # ===================================================== Calculated sheets cache
@@ -2304,6 +2928,19 @@ 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; }
@@ -2311,15 +2948,22 @@ 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
@@ -2327,17 +2971,32 @@ 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'}));
     }
-    if (($ENV{'form.usymb'}=~/^\_(\w+)/) && (!$ENV{'form.ufn'})) {
+    #
+    # Look for special assessment spreadsheets - '_feedback', etc.
+    #
+    if (($ENV{'form.usymb'}=~/^\_(\w+)/) && (!$ENV{'form.ufn'} || 
+                                             $ENV{'form.ufn'} eq '' || 
+                                             $ENV{'form.ufn'} eq 'default')) {
         $ENV{'form.ufn'}='default_'.$1;
     }
+    if (!$ENV{'form.ufn'} || $ENV{'form.ufn'} eq 'default') {
+        $ENV{'form.ufn'}='course_default_'.$sheettype;
+    }
+    #
     # Interactive loading of specific sheet?
+    #
     if (($ENV{'form.load'}) && ($ENV{'form.loadthissheet'} ne 'Default')) {
         $ENV{'form.ufn'}=$ENV{'form.loadthissheet'};
     }
@@ -2353,24 +3012,57 @@ 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 = '';
+        // cellformula may contain less-than and greater-than symbols, so
+        // we need to escape them?  
+        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) {
@@ -2389,7 +3081,7 @@ 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'}).
@@ -2398,70 +3090,74 @@ 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 ($sheet,$sheetdata)=&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'}) {
         $r->print('<h2>Modified Workcopy</h2>');
         $ENV{'form.unewformula'}=~s/\'/\"/g;
-        $r->print('<p>New formula: '.$ENV{'form.unewfield'}.'='.
-                  $ENV{'form.unewformula'}.'<p>');
-        $sheetdata->{'filename'} = $ENV{'form.ufn'};
-        &tmpread($sheet,$sheetdata,
-                 $ENV{'form.unewfield'},$ENV{'form.unewformula'});
+        $r->print('<p>Cell '.$ENV{'form.unewfield'}.' = <pre>');
+        $r->print(&HTML::Entities::encode($ENV{'form.unewformula'}).
+                  '</pre></p>');
+        $sheet->{'filename'} = $ENV{'form.ufn'};
+        &tmpread($sheet,$ENV{'form.unewfield'},$ENV{'form.unewformula'});
     } elsif ($ENV{'form.saveas'}) {
-        $sheetdata->{'filename'} = $ENV{'form.ufn'};
-        &tmpread($sheet,$sheetdata);
+        $sheet->{'filename'} = $ENV{'form.ufn'};
+        &tmpread($sheet);
     } else {
-        &readsheet($sheet,$sheetdata,$ENV{'form.ufn'});
-    }
-    # Print out user information
-    unless ($sheetdata->{'sheettype'} eq 'classcalc') {
-        $r->print('<p><b>User:</b> '.$sheetdata->{'uname'}.
-                  '<br><b>Domain:</b> '.$sheetdata->{'udom'});
-        $r->print('<br><b>Section/Group:</b> '.$sheetdata->{'csec'});
-        if ($ENV{'form.usymb'}) {
-            $r->print('<br><b>Assessment:</b> <tt>'.
-                      $ENV{'form.usymb'}.'</tt>');
-        }
-    }
-    #
-    # Check user permissions
-    if (($sheetdata->{'sheettype'} eq 'classcalc'       ) || 
-        ($sheetdata->{'uname'}     ne $ENV{'user.name'} ) ||
-        ($sheetdata->{'udom'}      ne $ENV{'user.domain'})) {
-        unless (&Apache::lonnet::allowed('vgr',$sheetdata->{'cid'})) {
-            $r->print('<h1>Access Permission Denied</h1>'.
-                      '</form></body></html>');
-            return OK;
-        }
+        &readsheet($sheet,$ENV{'form.ufn'});
     }
     # Additional options
-    $r->print('<br />'.
-              '<input type="submit" name="forcerecalc" '.
-              'value="Completely Recalculate Sheet"><p>');
-    if ($sheetdata->{'sheettype'} eq 'assesscalc') {
+    if ($sheet->{'sheettype'} eq 'assesscalc') {
         $r->print('<p><font size=+2>'.
                   '<a href="/adm/studentcalc?'.
-                  'uname='.$sheetdata->{'uname'}.
-                  '&udom='.$sheetdata->{'udom'}.'">'.
-                  'Level up: Student Sheet</a></font><p>');
+                  'uname='.$sheet->{'uname'}.
+                  '&udom='.$sheet->{'udom'}.'">'.
+                  'Level up: Student Sheet</a></font></p>');
     }
-    if (($sheetdata->{'sheettype'} eq 'studentcalc') && 
-        (&Apache::lonnet::allowed('vgr',$sheetdata->{'cid'}))) {
+    if (($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'};
@@ -2471,13 +3167,13 @@ ENDSCRIPT
                   '<input type=text size=20 name=newfn value="'.$fname.'">'.
                   'make default: <input type=checkbox name="makedefufn"><p>');
     }
-    $r->print(&hiddenfield('ufn',$sheetdata->{'filename'}));
+    $r->print(&hiddenfield('ufn',$sheet->{'filename'}));
     # Load dialog
     if (&Apache::lonnet::allowed('opa',$ENV{'request.course.id'})) {
         $r->print('<p><input type=submit name=load value="Load ...">'.
                   '<select name="loadthissheet">'.
                   '<option name="default">Default</option>');
-        foreach (&othersheets($sheet,$sheetdata->{'sheettype'},$sheetdata)) {
+        foreach (&othersheets($sheet)) {
             $r->print('<option name="'.$_.'"');
             if ($ENV{'form.ufn'} eq $_) {
                 $r->print(' selected');
@@ -2485,34 +3181,41 @@ ENDSCRIPT
             $r->print('>'.$_.'</option>');
         } 
         $r->print('</select><p>');
-        if ($sheetdata->{'sheettype'} eq 'studentcalc') {
+        if ($sheet->{'sheettype'} eq 'studentcalc') {
             &setothersheets($sheet,
-                            &othersheets($sheet,'assesscalc',$sheetdata));
+                            &othersheets($sheet,'assesscalc'));
         }
     }
-    # Cached sheets
-    &expirationdates();
-    undef %oldsheets;
-    undef %loadedcaches;
-    if ($sheetdata->{'sheettype'} eq 'classcalc') {
+    #
+    # 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");
         $r->rflush();
         &cachedcsheets();
-    } elsif ($sheetdata->{'sheettype'} eq 'studentcalc') {
+    } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
         $r->print("Loading previously calculated assessment sheets ...\n");
         $r->rflush();
-        &cachedssheets($sheetdata->{'uname'},$sheetdata->{'udom'},
-                       $sheetdata->{'uhome'});
+        &cachedssheets($sheet);
     }
     # Update sheet, load rows
     $r->print("Loaded sheet(s), updating rows ...<br>\n");
     $r->rflush();
     #
-    &updatesheet($sheet,$sheetdata);
+    &updatesheet($sheet);
     $r->print("Updated rows, loading row data ...\n");
     $r->rflush();
     #
-    &loadrows($sheet,$sheetdata,$r);
+    &loadrows($sheet,$r);
     $r->print("Loaded row data, calculating sheet ...<br>\n");
     $r->rflush();
     #
@@ -2524,23 +3227,23 @@ ENDSCRIPT
         if ($ENV{'form.saveas'} && ($fname=$ENV{'form.newfn'})) {
             $fname=~s/\W/\_/g;
             if ($fname eq 'default') { $fname='course_default'; }
-            $fname.='_'.$sheetdata->{'sheettype'};
-            $sheetdata->{'filename'} = $fname;
+            $fname.='_'.$sheet->{'sheettype'};
+            $sheet->{'filename'} = $fname;
             $ENV{'form.ufn'}=$fname;
             $r->print('<p>Saving spreadsheet: '.
-                      &writesheet($sheet,$ENV{'form.makedefufn'},$sheetdata).
+                      &writesheet($sheet,$ENV{'form.makedefufn'}).
                       '<p>');
         }
     }
     #
     # Write the modified worksheet
-    $r->print('<b>Current sheet:</b> '.$sheetdata->{'filename'}.'<p>');
-    &tmpwrite($sheet,$sheetdata);
-    if ($sheetdata->{'sheettype'} eq 'studentcalc') {
-        $r->print('<br>Show rows with empty A column: ');
+    $r->print('<b>Current sheet:</b> '.$sheet->{'filename'}.'</p>');
+    &tmpwrite($sheet);
+    if ($sheet->{'sheettype'} eq 'assesscalc') {
+        $r->print('<p>Show rows with empty A column: ');
     } else {
-        $r->print('<br>Show empty rows: ');
-    } 
+        $r->print('<p>Show empty rows: ');
+    }
     #
     $r->print(&hiddenfield('userselhidden','true').
               '<input type="checkbox" name="showall" onClick="submit()"');
@@ -2550,7 +3253,7 @@ ENDSCRIPT
     } else {
         unless ($ENV{'form.userselhidden'}) {
             unless 
-                ($ENV{'course.'.$ENV{'request.course.id'}.'.hideemptyrows'} eq 'yes') {
+                ($ENV{'course.'.$sheet->{'cid'}.'.hideemptyrows'} eq 'yes') {
                     $r->print(' checked');
                     $ENV{'form.showall'}=1;
                 }
@@ -2559,26 +3262,45 @@ ENDSCRIPT
     $r->print('>');
     #
     # CSV format checkbox (classcalc sheets only)
-    if ($sheetdata->{'sheettype'} eq 'classcalc') {
-        $r->print(' Output CSV format: <input type="checkbox" '.
-                  'name="showcsv" onClick="submit()"');
-        if ($ENV{'form.showcsv'}) { $r->print(' checked'); }
-        $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");
+    }
+#
+#    Mulit-sheet excel takes too long and does not work at all for large
+#    classes.  Future inclusion of this option may be possible with the
+#    Spreadsheet::WriteExcel::Big and speed improvements.
+#
+#    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') {
+        $r->print('&nbsp;Student Status: '.
+                  &Apache::lonhtmlcommon::StatusOptions
+                  ($ENV{'form.Status'},'sheet'));
     }
     #
     # Buttons to insert rows
-    $r->print('&nbsp;Student Status: '.
-              &Apache::lonhtmlcommon::StatusOptions
-              ($ENV{'form.Status'},'sheet'));
-    $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,$sheet,$sheetdata);
+    &outsheet($sheet,$r);
     $r->print('</form></body></html>');
     #  Done
     return OK;
@@ -2588,5 +3310,3 @@ ENDINSERTBUTTONS
 __END__
 
 
-
-