[PATCH/RFC v2 5/6] gettext: Add a Gettext interface for Perl

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Make Git's gettext messages available to Perl programs through
Locale::Messages. Gracefully fall back to English on systems that
don't contain the module.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 Makefile            |    4 ++-
 git-send-email.perl |    3 +-
 perl/Git/Gettext.pm |   83 +++++++++++++++++++++++++++++++++++++++++++++++++++
 perl/Makefile.PL    |    5 ++-
 4 files changed, 92 insertions(+), 3 deletions(-)
 create mode 100644 perl/Git/Gettext.pm

diff --git a/Makefile b/Makefile
index dce2faa..2101713 100644
--- a/Makefile
+++ b/Makefile
@@ -1884,7 +1884,9 @@ cscope:
 	$(FIND) . -name '*.[hcS]' -print | xargs cscope -b
 
 pot:
-	$(XGETTEXT) -k_ -o po/git.pot $(C_OBJ:o=c) $(SCRIPT_SH)
+	$(XGETTEXT) --keyword=_ --output=po/git.pot --language=C $(C_OBJ:o=c)
+	$(XGETTEXT) --join-existing --output=po/git.pot --language=Shell $(SCRIPT_SH)
+	$(XGETTEXT) --join-existing --output=po/git.pot --language=Perl $(SCRIPT_PERL)
 
 POFILES := $(wildcard po/*.po)
 MOFILES := $(patsubst po/%.po,share/locale/%/LC_MESSAGES/git.mo,$(POFILES))
diff --git a/git-send-email.perl b/git-send-email.perl
index 111c981..a36718e 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -26,6 +26,7 @@ use Term::ANSIColor;
 use File::Temp qw/ tempdir tempfile /;
 use Error qw(:try);
 use Git;
+use Git::Gettext qw< :all >;
 
 Getopt::Long::Configure qw/ pass_through /;
 
@@ -674,7 +675,7 @@ if (!defined $sender) {
 	$sender = $repoauthor || $repocommitter || '';
 	$sender = ask("Who should the emails appear to be from? [$sender] ",
 	              default => $sender);
-	print "Emails will be sent from: ", $sender, "\n";
+	printf gettext("Emails will be sent from: %s\n"), $sender;
 	$prompting++;
 }
 
diff --git a/perl/Git/Gettext.pm b/perl/Git/Gettext.pm
new file mode 100644
index 0000000..f434783
--- /dev/null
+++ b/perl/Git/Gettext.pm
@@ -0,0 +1,83 @@
+package Git::Gettext;
+use strict;
+use warnings;
+use Exporter;
+use base 'Exporter';
+
+our $VERSION = '0.01';
+
+our @EXPORT;
+our @EXPORT_OK = qw< gettext >;
+our %EXPORT_TAGS;
+@{ $EXPORT_TAGS{'all'} } = @EXPORT_OK;
+
+sub __bootstrap_locale_messages {
+	our $TEXTDOMAIN = 'git';
+
+	# TODO: How do I make the sed replacements in the top level
+	# Makefile reach me here?
+	#our $TEXTDOMAINDIR = q|@@LOCALEDIR@@|;
+	our $TEXTDOMAINDIR = q</usr/local/share/locale>;
+
+	require POSIX;
+	POSIX->import(qw< setlocale >);
+	# Non-core prerequisite module
+	require Locale::Messages;
+	Locale::Messages->import(qw< :locale_h :libintl_h >);
+
+	setlocale(LC_MESSAGES(), '');
+	setlocale(LC_CTYPE(), '');
+	textdomain($TEXTDOMAIN);
+	bindtextdomain($TEXTDOMAIN => $TEXTDOMAINDIR);
+
+	return;
+}
+
+BEGIN
+{
+	local ($@, $!);
+	eval { __bootstrap_locale_messages() };
+	if ($@) {
+		# Oh noes, no Locale::Messages here
+		*gettext = sub ($) { $_[0] };
+	}
+}
+
+1;
+
+__END__
+
+=head1 NAME
+
+Git::Gettext - Perl interface to Git's Gettext localizations
+
+=head1 DESCRIPTION
+
+Git's internal interface to Gettext via L<Locale::Messages>. If
+L<Locale::Messages> can't be loaded (it's not a core module) we
+provide stub passthrough fallbacks.
+
+=head1 FUNCTIONS
+
+=head2 gettext($)
+
+L<Locale::Messages>'s gettext function if all goes well, otherwise our
+passthrough fallback function.
+
+=head1 EXPORTS
+
+Exports are done via L<Exporter>. Invididual functions can be
+exporter, or all of them via the C<:all> export tag.
+
+=head1 AUTHOR
+
+E<AElig>var ArnfjE<ouml>rE<eth> Bjarmason <avarab@xxxxxxxxx>
+
+=head1 LICENSE AND COPYRIGHT
+
+Copyright 2010 E<AElig>var ArnfjE<ouml>rE<eth> Bjarmason <avarab@xxxxxxxxx>
+
+This program is free software, you can redistribute it and/or modify
+it under the same terms as Perl itself.
+
+=cut
diff --git a/perl/Makefile.PL b/perl/Makefile.PL
index 0b9deca..702ec7c 100644
--- a/perl/Makefile.PL
+++ b/perl/Makefile.PL
@@ -16,7 +16,10 @@ endif
 MAKE_FRAG
 }
 
-my %pm = ('Git.pm' => '$(INST_LIBDIR)/Git.pm');
+my %pm = (
+	'Git.pm' => '$(INST_LIBDIR)/Git.pm',
+	'Git/Gettext.pm' => '$(INST_LIBDIR)/Git/Gettext.pm',
+);
 
 # We come with our own bundled Error.pm. It's not in the set of default
 # Perl modules so install it if it's not available on the system yet.
-- 
1.7.1.248.gcd6d1

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