source: other-projects/diffcol/trunk/diffcol/Algorithm/htmldiff.pl@ 21711

#!/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();