--- doc/help/rebuildLabelHash.pl	2007/08/07 21:02:58	1.7
+++ doc/help/rebuildLabelHash.pl	2011/01/06 18:11:42	1.12
@@ -31,6 +31,7 @@ use strict;
 use GDBM_File;
 use File::Spec;
 
+my $path = '../../../../../doc/help';
 # I had to chdir, because neither glob nor bsd_glob accept globs
 # with ".." in them... sucky.
 chdir("../../loncom/html/adm/help/");
@@ -50,17 +51,16 @@ foreach my $file ( glob("*.tex") ) {
 	$file = substr($file, index($file, "/") + 1);
     } 
     my $contents = join("\n", <F>);
-    my $label;
 
     my $found=0;
     my $found_me=0;
     # Search for labels, of the form '\label{labelname}'
-    foreach $label ( $contents =~ /\\label\{([^\}]*)\}/g ) {
+    foreach my $label ( $contents =~ /\\label\{([^\}]*)\}/g ) {
 	$found = 1;
 	if ($file eq "$label.tex") {
 	    $found_me = 1;
 	}
-	if (exists $fragmentLabels{$label} ) {
+	if (exists($fragmentLabels{$label}) ) {
 	    print("***ERROR: '$label' in both $fragmentLabels{$label} " .
 		  "and $file. \n");
 	    $error++;
@@ -81,8 +81,67 @@ foreach my $file ( glob("*.tex") ) {
 if ($error == 0) {
     print("There were no duplicate labels. Database rebuilt.\n");
 } else {
-    print("There were $error errors. You must correct the duplicate labels.\n");
+    print("There were $error errors. You must correct the labels.\n");
+    exit(-1);
+}
+
+my $found_ref=0;
+foreach my $file ( glob("*.tex") ) {
+    open(my $fh , '<', $file);
+    if ( index($file, "/") != "/" ) {
+	$file = substr($file, index($file, "/") + 1);
+    } 
+    my $contents;
+    foreach my $line (<$fh>) {
+	next if ($line =~ /^%/);
+	$contents .= $line;
+    }
+    my $label;
+
+
+    # Search for references, of the form '\ref{labelname}', and whether
+    # we have logged the associated \label before
+    foreach my $ref ( $contents =~ /\\ref\{([^\}]*)\}/g ) {
+	if (!exists($fragmentLabels{$ref})
+	    && $ref ne 'course.manual.access.hlp'
+	    && $ref ne 'author.manual.access.hlp'
+            && $ref ne 'domain.manual.access.hlp'
+            && $ref ne 'course.manual.pdf'
+            && $ref ne 'author.manual.pdf'
+            && $ref ne 'domain.manual.pdf') {
+	    $error++;
+	    print("***ERROR: ref $ref in $file doesn't exist in label hash. \n");
+	} else {
+	    $found_ref++;
+	}
+    }
+}
+
+use HTML::TokeParser;
+foreach my $manual ('course.manual.texxml','author.manual.texxml','domain.manual.texxml') {
+    my $p = HTML::TokeParser->new($path.'/'.$manual);
+    if (!-e $path.'/'.$manual) {
+	$error++;
+	print("***ERROR: can't find manual $manual \n");
+    }
+    while (my $token = $p->get_token()) {
+	if ($token->[0] eq 'S' && $token->[1] eq 'file') {
+	    my $ref = $token->[2]{'name'};
+	    $ref =~ s/\.tex//;
+	    if (!exists($fragmentLabels{$ref})) {
+		$error++;
+		print("***ERROR: ref $ref in $manual doesn't exist in label hash. \n");
+	    }
+	}
+    }
+}
+
+if ($error == 0) {
+    print("There were no dangling references. $found_ref were checked.\n");
+} else {
+    print("There were $error errors. You must correct the dangling references.\n");
     exit(-1);
 }
 
+
 untie(%fragmentLabels);