Make language/update.sh safer, faster, cleaner.

Ref: #308

Co-authored-by: Hendrik Jäger <gitcommit@henk.geekmail.org>

language/update.sh

@@ -1,17 +1,48 @@
-#!/bin/bash
+#!/bin/sh
 
-rm -f anope.pot
-touch anope.pot
+if [ "${PWD##*/}" != "language" ]
+then
+	echo "Please run this script in the language/ subfolder of an anope source tree."
+	exit 1
+fi
 
-cd ..
-FILES=`find ./ -name *.cpp -o -name *.h -o -name *.conf | grep -v /docs/	 | grep -v /modules/third/`
-xgettext -E -C -s -d Anope -j -o language/anope.pot --from-code=utf-8 --keyword --keyword=_ $FILES
-cd -
+# truncate
+: > anope.pot
+
+# find .cpp, .h, and .conf files
+# exclude docs and third party modules
+# run xgettext on found files
+find ../ \
+	! -path '../docs/*' \
+	-a ! -path '../modules/third/*' \
+	-a \( -name '*.cpp' \
+		-o -name '*.h' \
+		-o -name '*.conf' \
+	\) \
+	-exec \
+		xgettext \
+			--escape \
+			--language=C++ \
+			--sort-output \
+			--default-domain=Anope \
+			--join-existing \
+			--output=anope.pot \
+			--from-code=utf-8 \
+			--keyword \
+			--keyword=_ \
+			{} +
 
 for f in *.po
 do
 	echo "Merging $f"
-	msgmerge --no-location --no-wrap --sort-output --update --verbose $f `echo $f | cut -d'.' -f1`.pot
+	msgmerge \
+		--no-location \
+		--no-wrap \
+		--sort-output \
+		--update \
+		--verbose \
+		"${f}" \
+		"${f%%.*}.pot"
 done
 
-rm -f *~
+rm -f -- *~