all: I18N supporttesting

This adds I18N support using standard gettext system together
with an initial German translation. This can be used to search
locales in some directory:

Intl.bindtextdomain("shopsystem", "/home/sre/src/serial-barcode-scanner");

And this can be used to switch language at runtime:

Intl.setlocale(LocaleCategory.ALL, "");

1 files changed, 13 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index d551b6b..ee08cef 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,18 @@
 all:
 	@cd src && make --no-print-directory all
 
+gettext: locale/de/LC_MESSAGES/shopsystem.mo
+
+locale/de/LC_MESSAGES/shopsystem.mo: locale/de.po
+	install -d locale/de/LC_MESSAGES/
+	msgfmt -o $@ $<
+
+locale/%.po: locale/messages.pot
+	msgmerge -N --backup=off --update $@ $<
+
+locale/messages.pot: */*/*.vala
+	xgettext --language=vala --from-code=utf-8 --keyword=_ --escape --sort-output -o $@ */*/*.vala
+
 clean:
 	@cd src && make --no-print-directory clean
 
@@ -14,4 +26,4 @@ shop.db: sql/tables.sql sql/views.sql sql/trigger.sql
 		sqlite3 shop.db < $$file; \
 	done
 
-.PHONY: all clean install
+.PHONY: all clean install gettext