#! /usr/bin/perl --					# -*-Perl-*-
eval "exec /usr/bin/perl -S $0 $*"
    if $running_under_some_shell;

# Combine a new .po file and an old translated .po file to a new translation.
# Copyright (C) 1995 Free Software Foundation, Inc.
# Ulrich Drepper <drepper@gnu.ai.mit.edu>, May 1995.
#

# To be compatible with Perl4 we don't use localtime here.
;# ctime.pl is a simple Perl emulation for the well known ctime(3C) function.
;#
;# Waldemar Kebsch, Federal Republic of Germany, November 1988
;# kebsch.pad@nixpbe.UUCP
;# Modified March 1990, Feb 1991 to properly handle timezones
;#  $Id: tupdate.in,v 1.20 1995/08/23 21:13:11 drepper Exp $
;#   Marion Hakanson (hakanson@cse.ogi.edu)
;#   Oregon Graduate Institute of Science and Technology
;#
;# usage:
;#
;#     #include <ctime.pl>          # see the -P and -I option in perl.man
;#     $Date = &ctime(time);

CONFIG: {
    package ctime;

    @DoW = ('Sun','Mon','Tue','Wed','Thu','Fri','Sat');
    @MoY = ('Jan','Feb','Mar','Apr','May','Jun',
	    'Jul','Aug','Sep','Oct','Nov','Dec');
}

sub ctime {
    package ctime;

    local($time) = @_;
    local($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst);

    # Determine what time zone is in effect.
    # Use GMT if TZ is defined as null, local time if TZ undefined.
    # There's no portable way to find the system default timezone.

    $TZ = defined($ENV{'TZ'}) ? ( $ENV{'TZ'} ? $ENV{'TZ'} : 'GMT' ) : '';
    ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) =
        ($TZ eq 'GMT') ? gmtime($time) : localtime($time);

    # Hack to deal with 'PST8PDT' format of TZ
    # Note that this can't deal with all the esoteric forms, but it
    # does recognize the most common: [:]STDoff[DST[off][,rule]]

    if($TZ=~/^([^:\d+\-,]{3,})([+-]?\d{1,2}(:\d{1,2}){0,2})([^\d+\-,]{3,})?/){
        $TZ = $isdst ? $4 : $1;
    }
    $TZ .= ' ' unless $TZ eq '';

    $year += ($year < 70) ? 2000 : 1900;
    sprintf("%s %s %2d %2d:%02d:%02d %s%4d\n",
      $DoW[$wday], $MoY[$mon], $mday, $hour, $min, $sec, $TZ, $year);
}
1;

# Check for --help and --version first.
#
for ($cnt = 0; $cnt <= $#ARGV; $cnt++)
{
    if ($ARGV[$cnt] eq "--v"
	|| $ARGV[$cnt] eq "--ve"
	|| $ARGV[$cnt] eq "--ver"
	|| $ARGV[$cnt] eq "--vers"
	|| $ARGV[$cnt] eq "--versi"
	|| $ARGV[$cnt] eq "--versio"
	|| $ARGV[$cnt] eq "--version")
    {
	print "tupdate - gettext 0.10\n";
	exit 0;
    }
    if ($ARGV[$cnt] eq "--h"
	|| $ARGV[$cnt] eq "--he"
	|| $ARGV[$cnt] eq "--hel"
	|| $ARGV[$cnt] eq "--help")
    {
	print "tupdate [--help | --version | NEW OLD]\n";
	print "  --help      give this help message and exit\n";
	print "  --version   display version information and exit\n";
	print "\n";
	print "NEW is the last created PO file (generally by xgettext).\n";
	print "It need not contain any translations.  OLD is the PO file\n";
	print "including the old translations which will be taken over to\n";
	print "the newly created file as long as they still match.\n";
	exit 0;
    }
}

# We take exactly two arguments.
#
if ($#ARGV != 1)
{
    die "Try `tupdate --help' for more information.\n";
}

unless (open(OLD, "$ARGV[1]"))
{
    die "Cannot open old translated .po file '$ARGV[1]'\n";
}

$last_was_special = 0;
$have_special = 0;
$last_comment = "";
$comment_special = "";

while (<OLD>)
{
    if (/^msgid[ \t]*/)
    {
	$_ =~ s/^msgid[ \t]*//;
	$msgid = $_;

	$_ = <OLD>;
	$last_was_special = 1
	    unless ($msgid ne "\"\"\n" || /^"/);

        while (/^"/)
        {
	    $msgid = "$msgid$_";
            $_ = <OLD>;
        }
    }
    if (/^msgstr/)
    {
        $_ =~ s/^msgstr[ \t]*//;
        $msgstr = $_;

        $_ = <OLD>;
        while (/^"/)
        {
	    $msgstr = "$msgstr$_";
            $_ = <OLD>;
        }

	if ($last_was_special == 0)
	{
	    # It makes no sense to keep entries without translations.
            $translate{$msgid} = $msgstr
                if ($msgstr ne "\"\"\n");
            $comment{$msgid} = $last_comment
                if ($last_comment ne "");
            $last_comment = "";
	}
	else
	{
	    $special_entry = $msgstr;
	    $have_special = 1;
	    $last_was_special = 0;
            $comment_special = $last_comment;
            $last_comment = "";
	}
    }
    $last_comment = "$last_comment$_"
	if (/^#[ \n\t]/);
}

close (OLD);

unless (open (NEW, "$ARGV[0]"))
{
    die "Cannot open new .po file '$ARGV[0]'\n";
}

# to be sure
$last_was_special = 0;
$first_msgstr_output = 1;

while (<NEW>)
{
    if (/^msgid[ \t]*/)
    {
	$_ =~ s/^msgid[ \t]*//;
	$msgid = $_;

	$_ = <NEW>;
	$last_was_special = 1
	    unless ($msgid ne "\"\"\n" || /^"/);

        while (/^"/)
        {
	    $msgid = "$msgid$_";
            $_ = <NEW>;
        }
    }
    if (/^msgstr/)
    {
        $_ =~ s/^msgstr[ \t]*//;
        $msgstr = $_;

        $_ = <NEW>;
        while (/^"/)
        {
	    $msgstr = "$msgstr$_";
            $_ = <NEW>;
        }

	if ($last_was_special != 0)
	{
	    # The new translated .po file should contain the special
	    # information entry of the old translated file.  But if
	    # later does not contain one we generate it by copying
	    # from the new .po file.
	    print $comment_special;

            print "msgid $msgid";

	    $special_entry = $msgstr
		if ($have_special == 0);

	    $today = &ctime (time);
	    chop $today;
	    $special_entry =~
	       s/Updated: .*/Updated: $today\\n"/;
	    printf "msgstr $special_entry";

	    $last_was_special = 0;
	}
	elsif (defined $translate{$msgid})
	{
            print $comment{$msgid}
		if (defined ($comment{$msgid}));

	    print "msgid $msgid";

            print "msgstr $translate{$msgid}";
	    delete $translate{$msgid}
	}
        else
        {
	    print "msgid $msgid";
            print "msgstr $msgstr";
        }
    }

    print;
}

foreach $key (keys %translate)
{
    print $comment{$key}
	if (defined ($comment{$key}));
    $escaped = $key;
    chop $escape;
    $escaped =~ s/\n/\n# /g;
    print "# msgid $escaped";
    $escaped = $translate{$key};
    $escaped =~ s/\n/\n# /g;
    print "msgstr $escaped\n";
}

# This variable is still set from processing the old .po file.
print $last_comment;

exit 0;