Use make functions for HELP_LINGUAS

Author: rbuj

help/Makefile.am

@@ -1,8 +1,26 @@
 @YELP_HELP_RULES@
 
 HELP_ID = mate-control-center
-HELP_FILES = index.docbook config-accessibility-keyboard.xml config-background.xml config-behavior.xml config-cds.xml config-default-apps.xml config-file-type.xml config-hints.xml config-html.xml config-kbd.xml config-keybindings.xml config-mouse.xml config-screensaver.xml config-themes.xml
+HELP_FILES = \
+	index.docbook \
+	config-accessibility-keyboard.xml \
+	config-background.xml \
+	config-behavior.xml \
+	config-cds.xml \
+	config-default-apps.xml \
+	config-file-type.xml \
+	config-hints.xml \
+	config-html.xml \
+	config-kbd.xml \
+	config-keybindings.xml \
+	config-mouse.xml \
+	config-screensaver.xml \
+	config-themes.xml
 
-HELP_LINGUAS = ca ca@valencia cs de el en_GB es fr id it ja oc pa pl pt pt_BR ru sv th uk vi zh_CN
+# Add linguas to be ignored, e.g. IGNORE_HELP_LINGUAS = ca de es fr
+IGNORE_HELP_LINGUAS =
+HELP_LINGUAS = $(if $(IGNORE_HELP_LINGUAS), \
+	$(filter-out $(IGNORE_HELP_LINGUAS),$(subst /,,$(dir $(wildcard */*.po)))), \
+	$(subst /,,$(dir $(wildcard */*.po))) )
 
 -include $(top_srcdir)/git.mk