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#!/usr/bin/perl -w

=head1 NAME

dh_translations - perform common translation related operations

=cut

use strict;

use File::Find;
use Debian::Debhelper::Dh_Lib;

=head1 SYNOPSIS

B<dh_translations> [S<B<debhelper options>>]

=head1 DESCRIPTION

dh_translations is a debhelper program to perform common translation
related operations during package build:

=over 4

=item

Try to build a current PO template.

=item

Remove inline translations from *.desktop, *.server, *.schemas, and
*.policy files and replace them with a link to the gettext domain, so that
strings in them will get translated at runtime from *.mo files.  This allows
language packs to ship updated translations.

=back

=cut

my ($domain, $use_intltool);

# figure out intltool usage and domain
sub check_buildsystem {
    $use_intltool = 0;
    if (open MAKEFILE, 'po/Makefile') {
	while (<MAKEFILE>) {
	    $use_intltool = 1 if /intltool/;

	    $domain = $1 if /^GETTEXT_PACKAGE\s*=\s*(\S*)/;
	}
	close (MAKEFILE);
    }
    if (!$domain && open CFGFILE, 'configure.ac') {
	while (<CFGFILE>) {
	    $use_intltool = 1 if /INTLTOOL/;

	    $domain = $1 if /^GETTEXT_PACKAGE\s*=\s*(\S*)/;
	}
	close (CFGFILE);
    }
    if (!$domain && open CFGFILE, 'configure.in') {
	while (<CFGFILE>) {
	    $use_intltool = 1 if /INTLTOOL/;

	    $domain = $1 if /^GETTEXT_PACKAGE\s*=\s*(\S*)/;
	}
	close (CFGFILE);
    }
    if (open CFGFILE, 'config.h') {
	while (<CFGFILE>) {
	    $domain = $1 if /^#define GETTEXT_PACKAGE\s*"(\S*)"/;
	}
	close (CFGFILE);
    }
    if (!$domain && open CFGFILE, 'setup.cfg') {
	while (<CFGFILE>) {
	    $domain = $1 if /^\s*domain\s*=\s*(\S*)/;
	}
	close (CFGFILE);
    }
    foreach my $ml ('CMakeLists.txt', 'po/CMakeLists.txt') {
        if (!$domain && open CMAKELISTSFILE, $ml) {
            while (<CMAKELISTSFILE>) {
                if ( -e 'po/POTFILES.in' ) {
                     $use_intltool = 1;
                }
                $domain = $1 if /^set\s*\(GETTEXT_PACKAGE\s*"?([^\s"]*)"?\s*\)/;
            }
            close (CMAKELISTSFILE)
        }
    }

    verbose_print "check_buildsystem: got domain '$domain', using intltool: $use_intltool";
}

# Try to build a POT
sub build_pot {

    my @cmd;
    if ($use_intltool) {
	# use intltool-update
	if ($domain) {
	    @cmd=('/usr/bin/intltool-update', '-p', '--verbose', '-g', $domain);
	} else {
	    @cmd=('/usr/bin/intltool-update', '-p', '--verbose');
	}
    } else {
        return unless -e 'po/Makefile';
	if ($domain) {
	    # let the Makefile itself handle it
	    @cmd=('make', $domain . '.pot');
	} else {
	    warn 'Does not use intltool and po/Makefile does not define GETTEXT_PACKAGE, cannot build POT automatically';
	    return;
	}
    }
    verbose_print (escape_shell (@cmd));
    chdir 'po';
    system @cmd;
    chdir '..';

    # try to build help POT
    if (-e 'help/Makefile') {
	chdir 'help';
	system ('make', 'pot');
	chdir '..';
    }
}

# strip translations and add domain to *.desktop/*.directory
sub process_desktop {
    my @lines = @{$_[0]};
    my @result;
    my $in_desktop_entry = 0;
    my $added_domain = 0;
    foreach (@lines) {
	# filter out translated fields
	next if (/^(Name|GenericName|Comment|X-GNOME-FullName)\[/);
	
	if (/^[A-Za-z-0-9-]*Gettext-Domain\s*=/) {
	    $added_domain = 1;
	}

	# catch section headers
	if (/^\[\s*(.+)\s*\]/) {
	    $in_desktop_entry = ($1 eq 'Desktop Entry');
	}

	# if we are ending the desktop section, append the domain
	if (/^\s*$/ && $in_desktop_entry && !$added_domain) {
	    push @result, "X-Ubuntu-Gettext-Domain=$domain\n";
	    $added_domain = 1;
	}
	
	push @result, $_;
    }

    # single-section .desktop files without ending empty lines
    if ($in_desktop_entry && !$added_domain) {
	push @result, "X-Ubuntu-Gettext-Domain=$domain\n";
    }
    return @result;
}

# add domain to Bonobo *.server files
sub process_server {
    my @lines = @{$_[0]};
    my @result;
    foreach (@lines) {
	if (/^<oaf_server\b/ && !/ubuntu-gettext-domain/) {
	    s/^<oaf_server/<oaf_server ubuntu-gettext-domain="icecream"/;
	}
	push @result, $_;
    }
    return @result;
}

# strip translations and add domain to gconf *.schemas files
sub process_gconf {
    my @lines = @{$_[0]};
    my @result;
    my $in_locale = 0;
    my $wrote_locale_tag = 0;
    my $locale_tag;

    foreach (@lines) {
	#case: within a non-C <locale> tag
	if ($in_locale) {
	    if (/^\s*<default>/) {
		if (!$wrote_locale_tag) {
		    push @result, $locale_tag;
		    $wrote_locale_tag = 1;
		}
		push @result, $_;
	    } elsif (/^\s*<\/locale>/) {
		push @result, $_ if $wrote_locale_tag;
		$in_locale = 0;
	    }
	}
	# case: locale name="C": add <gettext_domain> and leave alone
	elsif (/^(\s*)<locale name=\"C\">/) {
	    push @result, "$1<gettext_domain>$domain</gettext_domain>\n";
	    push @result, $_;
	} 
	# case: locale name="something": start $in_locale and purge <short> and <long>
	elsif (/<locale name=\"[^C]/) {
	    $in_locale = 1;
	    $wrote_locale_tag = 0;
	    $locale_tag = $_;
	}
	else {
	    push @result, $_ unless /^$/;
	    push @result, "\n" if /^\s*<\/schema>/; # to not kill all whitespace
	}
    }
    return @result;
}

# strip translations and add domain to *.policy files
sub process_polkit {
    my @lines = @{$_[0]};
    my @result;
    foreach (@lines) {
	# filter out translated fields
	next if (/<(message|description)\s+xml:lang=.*\/\1>/);

	# add domain
	s/<(message|description)\b/<$1 gettext-domain="$domain"/;

	push @result, $_;
    }
    return @result;
}

sub strip_file {
    my $f = $_;
    return unless $f =~ /\.(desktop|directory|server|policy|schemas)$/;
    my $ext = $1;
    return if -l $f or -d $f; # Skip directories and symlinks

    # See if we were asked to exclude this file.
    foreach my $x (@{$dh{EXCLUDE}}) {
            return if ($File::Find::name =~ m/\Q$x\E/);
    }

    print "  $f\n";
    my @lines;
    open F, $f or die "open $f: $!";
    @lines = <F>;
    close F;

    if ($ext eq 'desktop' || $ext eq 'directory') {
	@lines = process_desktop \@lines;
    }
    elsif ($ext eq 'server' && index($File::Find::name, '/bonobo/servers/') > 0) {
	@lines = process_server \@lines;
    } elsif ($ext eq 'policy' && index($File::Find::name, '/polkit-1/actions/') > 0) {
	@lines = process_polkit \@lines;
    } elsif ($ext eq 'schemas' && index($File::Find::name, '/gconf/') > 0) {
	@lines = process_gconf \@lines;
    }

    # write back modified result
    open F, ">$f" or die "open $f: $!";
    foreach (@lines) {
	print F $_;
    }
}

init();

check_buildsystem();
build_pot();

if ($domain) {
    print "dh_langpack: processing files to add translation domain '$domain'..\n";
    foreach my $package (@{$dh{DOPACKAGES}}) {
	    next if is_udeb($package);

	    find(\&strip_file, tmpdir($package))
    }
}

=head1 SEE ALSO

L<debhelper(1)>

=head1 AUTHOR

Martin Pitt <martin.pitt@ubuntu.com>

Copyright (C) 2011 Canonical Ltd., licensed under the GNU GPL v2 or later.

=cut