build: add i18n-add-language.sh helper

This script helps to initialize a new translation language over
the entire source tree.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

build/i18n-add-language.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+LANG=$1
+
+case "$LANG" in
+	[a-z][a-z]|[a-z][a-z]-[a-z][a-z]) : ;;
+	*)
+		echo "Usage: $0 <ISO_CODE>\n" >&2
+		exit 1
+	;;
+esac
+
+ADDED=0
+
+for podir in ./*/*/po; do
+	[ -d "$podir/templates" ] || continue
+
+	mkdir "$podir/$LANG"
+	for catalog in $(cd "$podir/templates"; echo *.pot); do
+		if [ -f "$podir/templates/$catalog" -a ! -f "$podir/$LANG/${catalog%.pot}.po" ]; then
+			msginit --no-translator -l "$LANG" -i "$podir/templates/$catalog" -o "$podir/$LANG/${catalog%.pot}.po"
+			git add "$podir/$LANG/${catalog%.pot}.po"
+			ADDED=$((ADDED + 1))
+		fi
+	done
+done
+
+if [ $ADDED -gt 0 ]; then
+	echo ""
+	echo "Added $ADDED new translation catalogs for language '$LANG'."
+	echo "Please also edit 'luci.mk' and add"
+	echo ""
+	echo "  LUCI_LANG.$LANG=Native Language Name"
+	echo ""
+	echo "to properly package the translation files."
+	echo ""
+fi