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#!/usr/bin/perl

eval 'exec /usr/bin/perl  -S $0 ${1+"$@"}'
    if 0; # not running under some shell

use strict;
use Archive::Tar;
use Getopt::Std;

my $opts = {};
getopts('h:', $opts) or die usage();

die usages() if $opts->{h};

### need Text::Diff -- give a polite error (not a standard prereq)
unless ( eval { require Text::Diff; Text::Diff->import; 1 } ) {
    die "\n\t This tool requires the 'Text::Diff' module to be installed\n";
}

my $arch = shift                        or die usage();
my $tar  = Archive::Tar->new( $arch )   or die "Couldn't read '$arch': $!";

foreach my $file ( $tar->get_files ) {
    next unless $file->is_file;
    my $name = $file->name;

diff(   \($file->get_content), $name,
            {   FILENAME_A  => $name,
                MTIME_A     => $file->mtime,
                OUTPUT      => \*STDOUT
            }
    );
}

sub usage {
    return q[

Usage:  ptardiff ARCHIVE_FILE
        ptardiff -h

ptardiff is a small program that diffs an extracted archive
    against an unextracted one, using the perl module Archive::Tar.

This effectively lets you view changes made to an archives contents.

Provide the progam with an ARCHIVE_FILE and it will look up all
    the files with in the archive, scan the current working directory
    for a file with the name and diff it against the contents of the
    archive.

Options:
    h   Prints this help message

Sample Usage:

$ tar -xzf Acme-Buffy-1.3.tar.gz
    $ vi Acme-Buffy-1.3/README

[...]

$ ptardiff Acme-Buffy-1.3.tar.gz > README.patch

See Also:
    tar(1)
    ptar
    Archive::Tar

] . $/;
}

=head1 NAME

ptardiff - program that diffs an extracted archive against an unextracted one

=head1 DESCRIPTION

ptardiff is a small program that diffs an extracted archive
    against an unextracted one, using the perl module Archive::Tar.

This effectively lets you view changes made to an archives contents.

=head1 SYNOPSIS

ptardiff ARCHIVE_FILE
    ptardiff -h

$ tar -xzf Acme-Buffy-1.3.tar.gz
    $ vi Acme-Buffy-1.3/README
    [...]
    $ ptardiff Acme-Buffy-1.3.tar.gz > README.patch

=head1 OPTIONS

h   Prints this help message

=head1 SEE ALSO

tar(1), L<Archive::Tar>.

=cut