source: git/lib/extract-msgs.pl

#!/usr/bin/perl -w
require 5.008;
use bytes;
use strict;
use POSIX;
use Locale::PO;

sub pot_creation_date {
    return strftime "%Y-%m-%d %H:%M:%S +0000", gmtime();
}

use integer;

my (%msgs, @uses, %comment, %loc);
my $translator_comment;
while (<ARGV>) {
    if (m!(/[/*])\s*(TRANSLATORS:.*?)\s*\z!) {
        my ($comment_type, $comment) = ($1, $2);
        if ($comment_type eq '/*') {
            while ($comment !~ s!\s*\*/\z!! && defined($_ = <ARGV>)) {
                if (m!^\s*\*?\s*(.*?)\s*\z!) {
                    # */ on a line by itself results in '/' for $1.
                    last if $1 eq '/';
                    $comment .= "\n$1";
                }
            }
        } else {
            # // comment - see if there are further // comments immediately
            # following.
            while (defined($_ = <ARGV>) && m!//\s*(.*?)\s*\z!) {
                $comment .= "\n$1";
            }
        }
        $comment =~ s/\n+$//;
        if (defined $translator_comment) {
            print STDERR "$ARGV:$.: Ignored TRANSLATORS comment: $translator_comment\n";
        }
        $translator_comment = $comment;
        last if !defined $_;
    }

    while (m!/\*(.*?)\*/(\d+)\b!g) {
        my ($msg, $msgno) = ($1, $2);
        # Handle there being a comment before the comment with the message in.
        $msg =~ s!.*/\*!!;
        if (exists $msgs{$msgno}) {
            if ($msgs{$msgno} ne $msg) {
                print STDERR "$ARGV:$.: Mismatch for message number $msgno:\n";
                print STDERR "$msgs{$msgno}\n$msg\n";
            }
        } else {
            $msgs{$msgno} = $msg;
        }
        if (defined $translator_comment) {
            if (exists $comment{$msgno} && $comment{$msgno} ne $translator_comment) {
                print STDERR "Different TRANSLATOR comments for message #$msgno\n";
                print STDERR "${$uses[$msgno]}[0]: $comment{$msgno}\n";
                print STDERR "$ARGV:$.: $translator_comment\n";
            } else {
                $comment{$msgno} = $translator_comment;
            }
            undef $translator_comment;
        }
        push @{$uses[$msgno]}, "$ARGV:$.";
    }
} continue {
    # Reset $. for each input file.
    close ARGV if eof;
}

my $num_list = Locale::PO->load_file_asarray("survex.pot");
my $first = 1;
foreach my $po_entry (@{$num_list}) {
    my $msgno = '';
    my $ref = $po_entry->reference;
    if (defined $ref && $ref =~ /^n:(\d+)$/m) {
        $msgno = $1;
    }
    if ($first) {
        $first = 0;
        if ($po_entry->msgid eq '""') {
            chomp(my $header = $po_entry->dump);
            print $header;
            next;
        }
        print << "END";
# Survex translation template.
# Copyright (C) YEAR COPYRIGHT HOLDERS
# This file is distributed under the same licence as Survex.
#
msgid ""
msgstr ""
"Project-Id-Version: survex\\n"
"Report-Msgid-Bugs-To: olly\@survex.com\\n"
"POT-Creation-Date: ${\(pot_creation_date)}\\n"
"PO-Revision-Date: YEAR-MO-DA HO:MI:SE +ZONE\\n"
"Language-Team: LANGUAGE <LL\@li.org>\\n"
"MIME-Version: 1.0\\n"
"Content-Type: text/plain; charset=utf-8\\n"
"Content-Transfer-Encoding: 8bit\\n"
END
    }
    my $msg;
    if (exists $msgs{$msgno}) {
        $msg = $msgs{$msgno};
        delete $msgs{$msgno};
    } else {
        print STDERR "../lib/survex.pot:", $po_entry->loaded_line_number, ": Message number $msgno is in survex.pot but not found in source - preserving\n" unless $po_entry->obsolete;
        $msg = $po_entry->dequote($po_entry->msgid);
    }
    if (exists $comment{$msgno}) {
        my $new = $comment{$msgno};
        my $old = $po_entry->automatic;
        $po_entry->automatic($new);
        if (defined $old) {
            $old =~ s/\s+/ /g;
            $new =~ s/\s+/ /g;
            if ($old ne $new) {
                print STDERR "Comment for message #$msgno changed:\n";
                print STDERR "../lib/survex.pot:", $po_entry->loaded_line_number, ": [$old]\n";
                print STDERR "${$uses[$msgno]}[0]: [$new]\n";
            }
        }
    }
    if (defined $po_entry->automatic) {
        if (!exists $comment{$msgno}) {
            my $fake_err = ": Comment for message #$msgno not in source code\n";
            if ($msgno ne '' && exists($uses[$msgno])) {
                print STDERR join($fake_err, "../lib/survex.pot:".$po_entry->loaded_line_number, @{$uses[$msgno]}), $fake_err if exists($uses[$msgno]);
                my $x = $po_entry->automatic;
                $x =~ s/\n/\n     * /g;
                print STDERR "    /* $x */\n";
            } else {
                # Currently unused message.
                # print STDERR $fake_err;
                # my $x = $po_entry->automatic;
                # $x =~ s/\n/\n     * /g;
                # print STDERR "    /* $x */\n";
            }
        }
        my $automatic = "\n" . $po_entry->automatic;
        $automatic =~ s/\n/\n#. /g;
        while ($automatic =~ s/\n#. \n/\n#.\n/g) { }
        print $automatic;
    }
    if ($msgno =~ /^\d+$/) {
        for (@{$uses[$msgno]}) {
            print "\n#: ", $_;
        }
        print "\n#: n:$msgno";
    }
    print "\n#, c-format" if $msg =~ /\%[a-z0-9.]/;
    if ($msg =~ s/(?:^|[^\\])"/\\"/g) {
        print STDERR "Escaping unescaped \" in message number $msgno\n";
    }
    print "\n";
    print "#~ " if $po_entry->obsolete;
    print "msgid \"$msg\"\n";
    print "#~ " if $po_entry->obsolete;
    print "msgstr \"\"\n";
}

for my $msgno (sort keys %msgs) {
    next if ($msgno == 0 || $msgno >= 1000);
    print STDERR "New message number $msgno\n";
    for (@{$uses[$msgno]}) {
        print "\n#: ", $_;
    }
    my $msg = $msgs{$msgno};
    print "\n#: n:$msgno";
    print "\n#, c-format" if $msg =~ /\%[a-z0-9.]/;
    if ($msg =~ s/(?:^|[^\\])"/\\"/g) {
        print STDERR "Escaping unescaped \" in message number $msgno\n";
    }
    print "\nmsgid \"$msg\"\n";
    print "msgstr \"\"\n";
}