#!/usr/bin/perl

#
# htmldiff uses HTML::Diff to create an HTML file that shows the difference
# between two HTML files, given on the command line.
#
# Contributed by Maurice Aubrey <maurice@redweek.com>
#

use strict;
use HTML::Diff;

@ARGV == 2 or die "Usage: $0 <file1> <file2>\n";

my @txt;
foreach (@ARGV) {
  open my $fh, $_ or die "unable to read '$_': $!";
  local $/;
  push @txt, scalar <$fh>;
}

print qq{<style type="text/css"><!-- ins{color: green} del{color:red}--></style>\n};
foreach (@{ html_word_diff(@txt) }) {
  my($type, $left, $right) = @$_;

  # debug
  #$left =~ s/\n/ /g;
  #$right =~ s/\n/ /g;
  #print "TYPE:$type\nLEFT: $left\nRIGHT: $right\n\n";
  #next;

  if ($type eq 'u') {
    print $left;
  } else {
    print "<del>$left</del>" if length $left;
    print "<ins>$right</ins>" if length $right;
  }
}