1 files changed, 100 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl/lib/Algorithm/htmldiff.pl b/Master/tlpkg/tlperl/lib/Algorithm/htmldiff.pl
new file mode 100755
index 00000000000..fdc81021582
--- /dev/null
+++ b/Master/tlpkg/tlperl/lib/Algorithm/htmldiff.pl
@@ -0,0 +1,100 @@
+#!/usr/bin/perl -w
+# diffs two files and writes an HTML output file.
+use strict;
+use CGI qw(:standard :html3);
+use Algorithm::Diff 'traverse_sequences';
+use Text::Tabs;
+
+my ( @a, @b );
+
+# Take care of whitespace.
+sub preprocess
+{
+	my $arrayRef = shift;
+	chomp(@$arrayRef);
+	@$arrayRef = expand(@$arrayRef);
+}
+
+# This will be called with both lines are the same
+sub match
+{
+	my ( $ia, $ib ) = @_;
+	print pre( $a[$ia] ), "\n";
+}
+
+# This will be called when there is a line in A that isn't in B
+sub only_a
+{
+	my ( $ia, $ib ) = @_;
+	print pre( { -class => 'onlyA' }, $a[$ia] ), "\n";
+}
+
+# This will be called when there is a line in B that isn't in A
+sub only_b
+{
+	my ( $ia, $ib ) = @_;
+	print pre( { -class => 'onlyB' }, $b[$ib] ), "\n";
+}
+
+# MAIN PROGRAM
+
+# Check for two arguments.
+print "usage: $0 file1 file2 > diff.html\n" if @ARGV != 2;
+
+$tabstop = 4;    # For Text::Tabs
+
+# Read each file into an array.
+open FH, $ARGV[0];
+@a = <FH>;
+close FH;
+
+open FH, $ARGV[1];
+@b = <FH>;
+close FH;
+
+# Expand whitespace
+preprocess( \@a );
+preprocess( \@b );
+
+# inline style
+my $style = <<EOS;
+	PRE {
+		margin-left: 24pt; 
+		font-size: 12pt;
+	    font-family: Courier, monospaced;
+		white-space: pre
+    }
+	PRE.onlyA { color: red }
+	PRE.onlyB { color: blue }
+EOS
+
+# Print out the starting HTML
+print
+
+  # header(),
+  start_html(
+	{
+		-title => "$ARGV[0] vs. $ARGV[1]",
+		-style => { -code => $style }
+	}
+  ),
+  h1(
+	{ -style => 'margin-left: 24pt' },
+	span( { -style => 'color: red' }, $ARGV[0] ),
+	span(" <i>vs.</i> "),
+	span( { -style => 'color: blue' }, $ARGV[1] )
+  ),
+  "\n";
+
+# And compare the arrays
+traverse_sequences(
+	\@a,    # first sequence
+	\@b,    # second sequence
+	{
+		MATCH     => \&match,     # callback on identical lines
+		DISCARD_A => \&only_a,    # callback on A-only
+		DISCARD_B => \&only_b,    # callback on B-only
+	}
+);
+
+print end_html();