build: Add gettext i18n support

Use the standard autotools gettext recipes to build our mo files.
Rather than use pygettext to parse the html.tmpl files, I am using a
simple shell snippet to extract the translatable strings and pass them
straight to xgettext.

In order to make sure the translations work when running from the source
tree, the build creates a mo/ directory in $(topdir) and config.py has
been adjusted to point to that.

Signed-off-by: Adam Litke <[email protected]>

Author: Adam Litke

ABOUT-NLS

@@ -20,8 +20,20 @@
 # License along with this library; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 
-SUBDIRS = src ui docs contrib tests
+SUBDIRS = src ui docs contrib tests po
 
 ACLOCAL_AMFLAGS = --install -I m4
 
 EXTRA_DIST = config.rpath
+
+# Link built mo files in the source tree to enable use of translations from
+# within the source tree
+all-local:
+	while read L && test -n "$$L"; do                  \
+		dir=mo/$$L/LC_MESSAGES ;                       \
+		$(MKDIR_P) $$dir ;                             \
+		ln -sf ../../../po/$$L.gmo $$dir/kimchi.mo ;   \
+	done < po/LINGUAS
+
+clean-local:
+	rm -rf mo

Makefile.am

@@ -39,8 +39,11 @@ AM_INIT_AUTOMAKE([-Wno-portability])
 AM_PATH_PYTHON([2.6])
 AC_PYTHON_MODULE([unittest])
 AC_SUBST([HAVE_PYMOD_UNITTEST])
+AM_GNU_GETTEXT([external])
+AM_GNU_GETTEXT_VERSION([0.10])
 
 AC_CONFIG_FILES([
+    po/Makefile.in
     Makefile
     docs/Makefile
     src/Makefile

configure.ac

@@ -0,0 +1,3 @@
+en_US
+pt_BR
+zh_CN