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#!/usr/bin/env perl 
# BEGIN BPS TAGGED BLOCK {{{
#
# COPYRIGHT:
#
# This software is Copyright (c) 1996-2019 Best Practical Solutions, LLC
#                                          <sales@bestpractical.com>
#
# (Except where explicitly superseded by other copyright notices)
#
#
# LICENSE:
#
# This work is made available to you under the terms of Version 2 of
# the GNU General Public License. A copy of that license should have
# been provided with this software, but in any event can be snarfed
# from www.gnu.org.
#
# This work 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
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 or visit their web page on the internet at
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.html.
#
#
# CONTRIBUTION SUBMISSION POLICY:
#
# (The following paragraph is not intended to limit the rights granted
# to you to modify and distribute this software under the terms of
# the GNU General Public License and is only of importance to you if
# you choose to contribute your changes and enhancements to the
# community by submitting them to Best Practical Solutions, LLC.)
#
# By intentionally submitting any modifications, corrections or
# derivatives to this work, or any other work intended for use with
# Request Tracker, to Best Practical Solutions, LLC, you confirm that
# you are the copyright holder for those contributions and you grant
# Best Practical Solutions,  LLC a nonexclusive, worldwide, irrevocable,
# royalty-free, perpetual, license to use, copy, create derivative
# works based on those contributions, and sublicense and distribute
# those contributions and any derivatives thereof.
#
# END BPS TAGGED BLOCK }}}
use strict;
use warnings;

use Locale::PO;
use Getopt::Long;
use File::Temp 'tempdir';

use constant PO_DIR => 'share/po';

use constant BOUNDARY => 20;

sub usage {
    warn @_, "\n\n" if @_;
    warn <<'    USAGE';
usages:

    rt-message-catalog stats [po-directory]
    rt-message-catalog clean
    rt-message-catalog rosetta download-url
    rt-message-catalog extract [po-file ...]

stats: Print stats for each translation.

clean: Remove unused and identity translations

rosetta: Merge translations from Launchpad's Rosetta; Requires a
  Launchpad translations export url.

extract: Extract message catalogs from source code and report common errors.

    If passed a specific translation file, only that file is updated.
    (Not recommended except for debugging.)

    USAGE
    exit 1;
}

my $command = shift;
usage() unless $command;
usage("Unknown command '$command'")
    unless main->can($command);

main->can($command)->( @ARGV );

exit;

sub stats {
    my $dir = shift || PO_DIR;

    my $max = 0;
    my %res = ();

    foreach my $po_file (<$dir/*.po>) {
        my $array = Locale::PO->load_file_asarray( $po_file, "utf-8" );

        $res{$po_file} = 0;

        my $size = 0;
        foreach my $entry ( splice @$array, 1 ) {
            next if $entry->obsolete;
            next if $entry->reference && $entry->reference =~ /NOT FOUND IN SOURCE/;
            $size++;
            next unless length $entry->dequote( $entry->msgstr );
            $res{$po_file}++;
        }
        $max = $size if $max < $size;
    }

    my $width = length($max);
    foreach my $po_file ( sort { $res{$b} <=> $res{$a} } keys %res ) {
        my $tr = $res{$po_file};
        my $perc = int($tr*1000/$max)/10;
        printf "%-20s %${width}d/%${width}d (%.1f%%)\n", "$po_file:", $tr, $max, $perc;
    }
}

sub clean {
    my $dir = shift || PO_DIR;

    foreach my $po_file (<$dir/*.po>) {
        my $array = Locale::PO->load_file_asarray( $po_file, "utf-8" );
        foreach my $entry ( splice @$array, 1 ) {
            # Replace identical translations with the empty string
            $entry->msgstr("") if $entry->msgstr eq $entry->msgid;

            # Skip NOT FOUND IN SOURCE entries
            next if $entry->obsolete;
            next if $entry->reference && $entry->reference =~ /NOT FOUND IN SOURCE/;

            push @$array, $entry;
        }
        Locale::PO->save_file_fromarray($po_file, $array, "utf-8");
    }
}

sub rosetta {
    my $url = shift or die 'must provide Rosetta download url or directory with new po files';

    my $dir;
    if ( $url =~ m{^[a-z]+://} ) {
        $dir = tempdir();
        my ($fname) = $url =~ m{([^/]+)$};

        print "Downloading $url\n";
        require LWP::Simple;
        LWP::Simple::getstore($url => "$dir/$fname");

        print "Extracting $dir/$fname\n";
        require Archive::Extract;
        my $ae = Archive::Extract->new(archive => "$dir/$fname");
        my $ok = $ae->extract( to => $dir );
    }
    elsif ( -e $url && -d _ ) {
        $dir = $url;
    }
    else {
        die "Is not URL or directory: '$url'";
    }

    my @files = ( <$dir/*/*/*.po>, <$dir/*/*.po>, <$dir/*.po> );
    unless ( @files ) {
        print STDERR "No files in $dir/rt/*.po and $dir/*.po\n";
        exit;
    }

    for my $file ( @files ) {
        my ($lang) = $file =~ m/([\w_]+)\.po/;
        my $fn_orig = PO_DIR . "/$lang.po";

        my $load_from = $fn_orig;
        $load_from = PO_DIR . "/rt.pot" unless -e $load_from;
        my $orig = Locale::PO->load_file_ashash( $fn_orig, "utf-8" );

        print "$file -> $fn_orig\n";

        my $rosetta = Locale::PO->load_file_asarray( $file, "utf-8" );

        # We're merging in the current hash as fallbacks for the rosetta hash
        my $translated = 0;
        foreach my $entry ( splice @$rosetta, 1 ) {
            # Skip no longer in source entries
            next if $entry->obsolete;
            next if $entry->reference && $entry->reference =~ /NOT FOUND IN SOURCE/;

            # Update to what the old po file had, if we have nothing
            my $oldval = $orig->{$entry->msgid};
            if (not length $entry->dequote($entry->msgstr) and $oldval) {
                $entry->msgstr($oldval->dequote($oldval->msgstr));
            }

            # Replace identical translations with the empty string
            $entry->msgstr("") if $entry->msgstr eq $entry->msgid;

            # Drop "fuzzy" information
            $entry->fuzzy_msgctxt(undef);
            $entry->fuzzy_msgid(undef);
            $entry->fuzzy_msgid_plural(undef);

            $translated++ if length $entry->dequote($entry->msgstr);
            push @$rosetta, $entry;
        }

        my $perc = int($translated/(@$rosetta - 1) * 100 + 0.5);
        if ( $perc < BOUNDARY and $lang !~ /^en(_[A-Z]{2})?$/) {
            unlink $fn_orig;
            next;
        }

        Locale::PO->save_file_fromarray($fn_orig, $rosetta, "utf-8");
    }
    extract();
}

sub extract {
    system($^X, 'devel/tools/extract-message-catalog', @_);
}