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package VCP::DiffFormat ;
=head1 NAME
VCP::DiffFormat - special diff format for VCP
=head1 SYNOPSIS
diff $a, $b { STYLE => "VCP::DiffFormat" };
=head1 DESCRIPTION
This is a plugin output formatter for Text::Diff that generates "unified" style
diffs without headers. VCP::Dest::revml uses this to output differences for
several reasons:
=over
=item *
The Unix C<diff> command is not available on all platforms by default,
specifically WinNT.
=item *
The two line "file header" is not needed in RevML, since the meta information
is captured elsewhere in the <rev> element, and the name and mtime
of the files being compared is irrellevant; they're just some temporary files
somewhere
=item *
Because RevML offers MD5 hashes of the file to verify that a diff was applied
properly, all of the "-" lines present in a normal unified diff are not
necesssary. They are left in now for ease of debugging with RevML files, but
may be stripped out to conserve space.
=cut
@ISA = qw( Text::Diff::Unified );
use strict;
use Text::Diff;
use Carp;
sub file_header { "" }
=head1 COPYRIGHT
Copyright 2000, Perforce Software, Inc. All Rights Reserved.
This module and the VCP package are licensed according to the terms given in
the file LICENSE accompanying this distribution, a copy of which is included in
L<vcp>.
=head1 AUTHOR
Barrie Slaymaker <barries@slaysys.com>
=cut
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