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package Git::I18N;
use 5.008001;
use strict;
use warnings $ENV{GIT_PERL_FATAL_WARNINGS} ? qw(FATAL all) : ();
BEGIN {
	require Exporter;
	if ($] < 5.008003) {
		*import = \&Exporter::import;
	} else {
		# Exporter 5.57 which supports this invocation was
		# released with perl 5.8.3
		Exporter->import('import');
	}
}

our @EXPORT = qw(__ __n N__);
our @EXPORT_OK = @EXPORT;

# See Git::LoadCPAN's NO_PERL_CPAN_FALLBACKS_STR for a description of
# this "'@@' [...] '@@'" pattern.
use constant NO_GETTEXT_STR => '@@' . 'NO_GETTEXT' . '@@';
use constant NO_GETTEXT => (
	q[] ne ''
	and
	q[] ne NO_GETTEXT_STR
);

sub __bootstrap_locale_messages {
	our $TEXTDOMAIN = 'git';
	our $TEXTDOMAINDIR ||= $ENV{GIT_TEXTDOMAINDIR} || '/usr/share/locale';
	die "NO_GETTEXT=" . NO_GETTEXT_STR if NO_GETTEXT;

	require POSIX;
	POSIX->import(qw(setlocale));
	# Non-core prerequisite module
	require Locale::Messages;
	Locale::Messages->import(qw(:locale_h :libintl_h));

	setlocale(LC_MESSAGES(), '');
	setlocale(LC_CTYPE(), '');
	textdomain($TEXTDOMAIN);
	bindtextdomain($TEXTDOMAIN => $TEXTDOMAINDIR);

	return;
}

BEGIN
{
	# Used by our test script to see if it should test fallbacks or
	# not.
	our $__HAS_LIBRARY = 1;

	local $@;
	eval {
		__bootstrap_locale_messages();
		*__ = \&Locale::Messages::gettext;
		*__n = \&Locale::Messages::ngettext;
		1;
	} or do {
		# Tell test.pl that we couldn't load the gettext library.
		$Git::I18N::__HAS_LIBRARY = 0;

		# Just a fall-through no-op
		*__ = sub ($) { $_[0] };
		*__n = sub ($$$) { $_[2] == 1 ? $_[0] : $_[1] };
	};

	sub N__($) { return shift; }
}

1;

__END__

=head1 NAME

Git::I18N - Perl interface to Git's Gettext localizations

=head1 SYNOPSIS

	use Git::I18N;

	print __("Welcome to Git!\n");

	printf __("The following error occurred: %s\n"), $error;

	printf __n("committed %d file\n", "committed %d files\n", $files), $files;


=head1 DESCRIPTION

Git's internal Perl interface to gettext via L<Locale::Messages>. If
L<Locale::Messages> can't be loaded (it's not a core module) we
provide stub passthrough fallbacks.

This is a distilled interface to gettext, see C<info '(gettext)Perl'>
for the full interface. This module implements only a small part of
it.

=head1 FUNCTIONS

=head2 __($)

L<Locale::Messages>'s gettext function if all goes well, otherwise our
passthrough fallback function.

=head2 __n($$$)

L<Locale::Messages>'s ngettext function or passthrough fallback function.

=head2 N__($)

No-operation that only returns its argument. Use this if you want xgettext to
extract the text to the pot template but do not want to trigger retrival of the
translation at run time.

=head1 AUTHOR

E<AElig>var ArnfjE<ouml>rE<eth> Bjarmason <avarab@gmail.com>

=head1 COPYRIGHT

Copyright 2010 E<AElig>var ArnfjE<ouml>rE<eth> Bjarmason <avarab@gmail.com>

=cut