js-auto-compiler

#!/bin/bash

# Global defaults
CLOSURE_COMPILER="/opt/local/lib/closure/compiler.jar"
FREQUENCY=5

# System override the defaults
if [ -f /etc/default/closure ]; then
	. /etc/default/closure
fi

if ! [ -r "$CLOSURE_COMPILER" ]; then
	echo "Error: cannot find the closer compiler $CLOSURE_COMPILER" >&2
	exit 1
fi

COMPILE="java -jar $CLOSURE_COMPILER"

# First argument can be the directory
if [ -n "$1" ]; then
	cd "$1" || exit 1
fi

### THE MEAT ###
################

# Cross-platform growl notification #
notify() {
	TEXT="$@"
	if which growlnotify >/dev/null 2>&1; then
		growlnotify -n "Closure Compiler" -w << _EOM_
$TEXT
_EOM_
	elif which notify-send >/dev/null 2>&1; then
		notify-send -t 3000 "Closure Compiler" "$TEXT" 2>/dev/null || echo "$TEXT"
	else
		echo "    $TEXT" | sed 's/\n/\n    /'
	fi
}

# Clear a line #
clearline() {
	echo -e -n "\r                                                          \r" > /dev/stdout
}

# Cross-platform stat command #
if stat -c %Y . >/dev/null 2>&1 ; then
	STAT="stat -c %Y"
elif stat -f %c . >/dev/null 2>&1 ; then
	STAT="stat -f %c"
else
	echo "Error: Invalid stat version: " >&2
	stat --version >&2
	exit 1
fi


DIRECTORY=$(pwd)

echo "Scanning directory: $DIRECTORY ..."

COUNT=0
SPINNER="|/-\\"
while true; do
	clearline
	echo -n "  "${SPINNER:$COUNT:1} > /dev/stdout
	find . -maxdepth 1 -name '*.js' | while read JSFILE; do
		# IGNORE already minified files
		[ $(basename $JSFILE .min.js) != $(basename $JSFILE) ] && continue
		JSMINFILE="$(basename $JSFILE .js).min.js"
		if [ -f $JSMINFILE ]; then
			# checking if min file is older
			if [ $($STAT $JSMINFILE) -lt $($STAT $JSFILE) ]; then
				clearline
				echo "  minifying: $JSFILE => $JSMINFILE"
				MESSAGE=$($COMPILE --js $JSFILE --js_output_file $JSMINFILE 2>&1)
				if [ $? -eq 0 ]; then
					notify ${MESSAGE:-$DIRECTORY/$(basename $JSFILE) => $JSMINFILE}
				else
					notify "Error minifying $JSFILE, see the log for more details"
					echo "$MESSAGE" >&2
				fi
			fi
		else
			clearline
			echo "  minifying: $JSFILE => $JSMINFILE"
			MESSAGE=$($COMPILE --js $JSFILE --js_output_file $JSMINFILE 2>&1)
			if [ $? -eq 0 ]; then
				notify ${MESSAGE:-$DIRECTORY/$(basename $JSFILE) => $JSMINFILE}
			else
				notify "Error minifying $JSFILE, see the log for more details"
				echo "$MESSAGE" >&2
			fi
		fi
	done
	sleep $FREQUENCY
	COUNT=$(expr $(expr $COUNT + 1) % 4)
done