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package Dpkg::Gettext;

use strict;
use warnings;

our $VERSION = '1.01';
our @EXPORT = qw(
    textdomain
    ngettext
    g_
    P_
    _g
);

use Exporter qw(import);

=encoding utf8

=head1 NAME

Dpkg::Gettext - convenience wrapper around Locale::gettext

=head1 DESCRIPTION

The Dpkg::Gettext module is a convenience wrapper over the Locale::gettext
module, to guarantee we always have working gettext functions, and to add
some commonly used aliases.

=head1 VARIABLES

=over 4

=item $Dpkg::Gettext::DEFAULT_TEXT_DOMAIN

Specifies the default text domain name to be used with the short function
aliases. This is intended to be used by the Dpkg modules, so that they
can produce localized messages even when the calling program has set the
current domain with textdomain(). If you would like to use the aliases
for your own modules, you might want to set this variable to undef, or
to another domain, but then the Dpkg modules will not produce localized
messages.

=back

=cut

our $DEFAULT_TEXT_DOMAIN = 'dpkg-dev';

=head1 FUNCTIONS

=over 4

=item $trans = g_($msgid)

Calls dgettext() on the $msgid and returns its translation for the current
locale. If dgettext() is not available, simply returns $msgid.

=item $trans = C_($msgctxt, $msgid)

Calls dgettext() on the $msgid and returns its translation for the specific
$msgctxt supplied. If dgettext() is not available, simply returns $msgid.

=item $trans = P_($msgid, $msgid_plural, $n)

Calls dngettext(), returning the correct translation for the plural form
dependent on $n. If dngettext() is not available, returns $msgid if $n is 1
or $msgid_plural otherwise.

=back

=cut

use constant GETTEXT_CONTEXT_GLUE => "\004";

BEGIN {
    eval 'use Locale::gettext';
    if ($@) {
        eval q{
            sub g_ {
                return shift;
            }
            sub textdomain {
            }
            sub ngettext {
                my ($msgid, $msgid_plural, $n) = @_;
                if ($n == 1) {
                    return $msgid;
                } else {
                    return $msgid_plural;
                }
            }
            sub C_ {
                my ($msgctxt, $msgid) = @_;
                return $msgid;
            }
            sub P_ {
                return ngettext(@_);
            }
        };
    } else {
        eval q{
            sub g_ {
                return dgettext($DEFAULT_TEXT_DOMAIN, shift);
            }
            sub C_ {
                my ($msgctxt, $msgid) = @_;
                return dgettext($DEFAULT_TEXT_DOMAIN,
                                $msgctxt . GETTEXT_CONTEXT_GLUE . $msgid);
            }
            sub P_ {
                return dngettext($DEFAULT_TEXT_DOMAIN, @_);
            }
        };
    }
}

# XXX: Backwards compatibility, to be removed on VERSION 2.00.
sub _g ## no critic (Subroutines::ProhibitUnusedPrivateSubroutines)
{
    my $msgid = shift;

    require Carp;
    Carp::carp('obsolete _g() function, please use g_() instead');

    return g_($msgid);
}

=head1 CHANGES

=head2 Version 1.01 (dpkg 1.18.0)

Now the short aliases (g_ and P_) will call domain aware functions with
$DEFAULT_TEXT_DOMAIN.

New functions: g_(), C_().

Deprecated function: _g().

=head2 Version 1.00 (dpkg 1.15.6)

Mark the module as public.

=cut

1;
