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#!/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();