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#!/usr/bin/perl
use strict;
use warnings;
use Getopt::Long;
my $output;
GetOptions(
'output=s' => \$output,
);
if (!@ARGV) {
print <<END;
Usage: vlpatch.pl [--output outfile] original patch
vlpatch [--output outfile] original # take patch from stdin
if --output is not specified, the patched file is put in place of
the original, and the original is renamed to *.orig
END
exit;
}
my $orig = shift @ARGV;
my ($pat,$patsrc) = @ARGV ? ($ARGV[0],$ARGV[0]) : (\*STDIN,'-');
my $el1 = VCS::Lite->new($orig);
my $dt1 = VCS::Lite::Delta->new($patsrc,undef,$orig,$pat);
my $chg = $el1->patch($dt1) or die "Patch failed";
if (!$output) {
rename $orig, "$orig.orig";
$output = $orig;
}
open PAT,">$output" or die "Failed to write output, $!";
print PAT $chg->text;
close PAT;
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