#!/usr/bin/perl -W
#
# A script that adds timestameps to PO (gettext) files.
#
#	Copyright (C) 2010 Bogdan 'bogdro' Drozdowski, http://rudy.mif.pg.gda.pl/~bogdro/inne/
#		(bogdandr AT op.pl, bogdro AT rudy.mif.pg.gda.pl)
#
#	Licence:
#	GNU General Public Licence v3+
#
#	Last modified : 2010-03-17
#
# Usage:
#	add-po-timestamps.pl file.po
#
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 3
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foudation:
#		Free Software Foundation
#		51 Franklin Street, Fifth Floor
#		Boston, MA 02110-1301
#		USA
#

use strict;
use warnings;
use Tie::File;

if ( @ARGV == 0 )
{
	print "Syntax: $0 file.po\n";
	exit 1;
}

my ($out, @input);

if ( ! tie (@input, 'Tie::File', $ARGV[0]) )
{
	# $! is the error message
	print "$0: $ARGV[0]: $!\n";
	exit 2;
}

if ( ! open ( $out, "> $ARGV[0].tmp" ) ) {
	print "$0: $ARGV[0].tmp: $!\n";
	untie @input;
	exit 3;
}

my $datetime = localtime;
$datetime =~ s/(\w+)\s+(\w+)\s+(\d+)\s+(\d{1,2}:\d{1,2}:\d{1,2})\s+(\d{4})(.*)/$1, $2 $3 $5 $4 $6/;
chop ($datetime);

my $datedone = 0;	# flag

foreach (@input)
{
	if ( /^msgid/o && ! $datedone )
	{
		print $out "#: Last-Modified: $datetime\n";
		print $out "$_\n";
		$datedone = 0;
	}
	elsif ( /^#: Last-Modified/o )
	{
		print $out "#: Last-Modified: $datetime\n";
		$datedone = 1;
	}
	else
	{
		print $out "$_\n";
		$datedone = 0;
	}
}

close $out;
untie @input;

#rename "$ARGV[0].tmp", $ARGV[0];