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Ævar Arnfjörð Bjarmason 5e9637c629 i18n: add infrastructure for translating Git with gettext
Change the skeleton implementation of i18n in Git to one that can show
localized strings to users for our C, Shell and Perl programs using
either GNU libintl or the Solaris gettext implementation.

This new internationalization support is enabled by default. If
gettext isn't available, or if Git is compiled with
NO_GETTEXT=YesPlease, Git falls back on its current behavior of
showing interface messages in English. When using the autoconf script
we'll auto-detect if the gettext libraries are installed and act
appropriately.

This change is somewhat large because as well as adding a C, Shell and
Perl i18n interface we're adding a lot of tests for them, and for
those tests to work we need a skeleton PO file to actually test
translations. A minimal Icelandic translation is included for this
purpose. Icelandic includes multi-byte characters which makes it easy
to test various edge cases, and it's a language I happen to
understand.

The rest of the commit message goes into detail about various
sub-parts of this commit.

= Installation

Gettext .mo files will be installed and looked for in the standard
$(prefix)/share/locale path. GIT_TEXTDOMAINDIR can also be set to
override that, but that's only intended to be used to test Git itself.

= Perl

Perl code that's to be localized should use the new Git::I18n
module. It imports a __ function into the caller's package by default.

Instead of using the high level Locale::TextDomain interface I've
opted to use the low-level (equivalent to the C interface)
Locale::Messages module, which Locale::TextDomain itself uses.

Locale::TextDomain does a lot of redundant work we don't need, and
some of it would potentially introduce bugs. It tries to set the
$TEXTDOMAIN based on package of the caller, and has its own
hardcoded paths where it'll search for messages.

I found it easier just to completely avoid it rather than try to
circumvent its behavior. In any case, this is an issue wholly
internal Git::I18N. Its guts can be changed later if that's deemed
necessary.

See <AANLkTilYD_NyIZMyj9dHtVk-ylVBfvyxpCC7982LWnVd@mail.gmail.com> for
a further elaboration on this topic.

= Shell

Shell code that's to be localized should use the git-sh-i18n
library. It's basically just a wrapper for the system's gettext.sh.

If gettext.sh isn't available we'll fall back on gettext(1) if it's
available. The latter is available without the former on Solaris,
which has its own non-GNU gettext implementation. We also need to
emulate eval_gettext() there.

If neither are present we'll use a dumb printf(1) fall-through
wrapper.

= About libcharset.h and langinfo.h

We use libcharset to query the character set of the current locale if
it's available. I.e. we'll use it instead of nl_langinfo if
HAVE_LIBCHARSET_H is set.

The GNU gettext manual recommends using langinfo.h's
nl_langinfo(CODESET) to acquire the current character set, but on
systems that have libcharset.h's locale_charset() using the latter is
either saner, or the only option on those systems.

GNU and Solaris have a nl_langinfo(CODESET), FreeBSD can use either,
but MinGW and some others need to use libcharset.h's locale_charset()
instead.

=Credits

This patch is based on work by Jeff Epler <jepler@unpythonic.net> who
did the initial Makefile / C work, and a lot of comments from the Git
mailing list, including Jonathan Nieder, Jakub Narebski, Johannes
Sixt, Erik Faye-Lund, Peter Krefting, Junio C Hamano, Thomas Rast and
others.

[jc: squashed a small Makefile fix from Ramsay]

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-12-05 20:46:55 -08:00

110 lines
2.8 KiB
Perl

#!/usr/bin/perl
use 5.008;
use lib (split(/:/, $ENV{GITPERLLIB}));
use strict;
use warnings;
use POSIX qw(:locale_h);
use Test::More tests => 8;
use Git::I18N;
my $has_gettext_library = $Git::I18N::__HAS_LIBRARY;
ok(1, "Testing Git::I18N with " .
($has_gettext_library
? (defined $Locale::Messages::VERSION
? "Locale::Messages version $Locale::Messages::VERSION"
# Versions of Locale::Messages before 1.17 didn't have a
# $VERSION variable.
: "Locale::Messages version <1.17")
: "NO Perl gettext library"));
ok(1, "Git::I18N is located at $INC{'Git/I18N.pm'}");
{
my $exports = @Git::I18N::EXPORT;
ok($exports, "sanity: Git::I18N has $exports export(s)");
}
is_deeply(\@Git::I18N::EXPORT, \@Git::I18N::EXPORT_OK, "sanity: Git::I18N exports everything by default");
# prototypes
{
# Add prototypes here when modifying the public interface to add
# more gettext wrapper functions.
my %prototypes = (qw(
__ $
));
while (my ($sub, $proto) = each %prototypes) {
is(prototype(\&{"Git::I18N::$sub"}), $proto, "sanity: $sub has a $proto prototype");
}
}
# Test basic passthrough in the C locale
{
local $ENV{LANGUAGE} = 'C';
local $ENV{LC_ALL} = 'C';
local $ENV{LANG} = 'C';
my ($got, $expect) = (('TEST: A Perl test string') x 2);
is(__($got), $expect, "Passing a string through __() in the C locale works");
}
# Test a basic message on different locales
SKIP: {
unless ($ENV{GETTEXT_LOCALE}) {
# Can't reliably test __() with a non-C locales because the
# required locales may not be installed on the system.
#
# We test for these anyway as part of the shell
# tests. Skipping these here will eliminate failures on odd
# platforms with incomplete locale data.
skip "GETTEXT_LOCALE must be set by lib-gettext.sh for exhaustive Git::I18N tests", 2;
}
# The is_IS UTF-8 locale passed from lib-gettext.sh
my $is_IS_locale = $ENV{is_IS_locale};
my $test = sub {
my ($got, $expect, $msg, $locale) = @_;
# Maybe this system doesn't have the locale we're trying to
# test.
my $locale_ok = setlocale(LC_ALL, $locale);
is(__($got), $expect, "$msg a gettext library + <$locale> locale <$got> turns into <$expect>");
};
my $env_C = sub {
$ENV{LANGUAGE} = 'C';
$ENV{LC_ALL} = 'C';
};
my $env_is = sub {
$ENV{LANGUAGE} = 'is';
$ENV{LC_ALL} = $is_IS_locale;
};
# Translation's the same as the original
my ($got, $expect) = (('TEST: A Perl test string') x 2);
if ($has_gettext_library) {
{
local %ENV; $env_C->();
$test->($got, $expect, "With", 'C');
}
{
my ($got, $expect) = ($got, 'TILRAUN: Perl tilraunastrengur');
local %ENV; $env_is->();
$test->($got, $expect, "With", $is_IS_locale);
}
} else {
{
local %ENV; $env_C->();
$test->($got, $expect, "Without", 'C');
}
{
local %ENV; $env_is->();
$test->($got, $expect, "Without", 'is');
}
}
}