build: i18n-sync script refinements

add -P x to xargs for x number of processes.

Signed-off-by: Paul Donald <newtwen@gmail.com>

build/i18n-sync.sh

@@ -1,24 +1,65 @@
 #!/bin/sh
 
-[ -d ./build ] || {
+print_help() {	
 	echo "Execute as ./build/i18n-sync.sh" >&2
+	echo "Or run as: ./build/i18n-sync.sh [module folder e.g. applications/luci-app-example]" >&2
+}
+
+[ -d ./build ] || {
+	print_help
 	exit 1
 }
 
+case $1 in
+	-h | --help )
+		print_help
+		exit 0
+		;;
+esac
+
+[ -n "$1" ] && set -- "${1%/}"
+
 [ -n "$1" ] || ./build/mkbasepot.sh
 
-find "${1:-.}" -name '*.pot' -and -not -name base.pot | \
+# Absent a [folder] parameter, use the current path
-	while read path; do
+find "${1:-.}" -name '*.pot' -and -not -name base.pot | sort | \
-		dir="${path%/po/templates/*}"
+    xargs -P 10 -I{} sh -c '
-		echo -n "Updating ${path#./} ... "
+        dir="${1%/po/templates/*}"
-		./build/i18n-scan.pl "$dir" > "$path"
+        echo "Updating ${1#./} ... "
+        ./build/i18n-scan.pl "$dir" > "$1"
         echo "done"
-	done
+    ' sh {}
+
+	# while read path; do
+	# 	dir="${path%/po/templates/*}"
+	# 	echo "Updating ${path#./} ... "
+	# 	# Scan for strings in a directory and stash them in the .pot file:
+	# 	./build/i18n-scan.pl "$dir" > "$path"
+	# 	echo "done"
+	# done
+
 
 if [ -n "$1" ]; then
+	if [ "$(uname)" = "Darwin" ] || [ "$(uname)" = "FreeBSD" ]; then
+	    # macOS-specific commands
+	    find "$1" -path '*/templates/*.pot' -print0 | xargs -0r stat -f '%N' | \
+	    	xargs -r -n 1 dirname | \
+	    	xargs -r -n 1 dirname | sort | \
+	    	xargs -r -n 1 -P 40 ./build/i18n-update.pl
+	elif [ "$(uname)" = "Linux" ]; then
+	    # Linux-specific commands
 		find "$1" -path '*/templates/*.pot' -printf '%h ' | \
 			xargs -r -n 1 dirname | \
-		xargs -r -n 1 ./build/i18n-update.pl
+			xargs -r -n 1 -P 40 ./build/i18n-update.pl
+	# elif [ "$(uname)" = "SunOS" ]; then
+	# 	# Solaris-specific commands
 	else
+		# GNU specific commands can go here:
+		find "$1" -path '*/templates/*.pot' -printf '%h ' | \
+			xargs -r -n 1 dirname | \
+			xargs -r -n 1 -P 40 ./build/i18n-update.pl
+	fi
+else
+	# this performs operations on all .po files
 	./build/i18n-update.pl
 fi