Run some script when file changes

watch.coffee

#!/usr/bin/env coffee
fs = require('fs')
exec = require('child_process').exec

unless process.argv[3]?
	console.log """
	missing parameters :
		watch.coffee directory_to_watch script_to_exec_on_file_change
	"""
	process.exit -1

target = '.'
target = process.argv[2] if process.argv[2]?
script = process.argv[3..].join(' ')
console.log "when any file in #{target} changes I'll execute #{script}"
running = false

fs.watch target, (event, filename) -> 
	return "" if running
	running = true
	console.log 'change detected'
	exec script, (error, stdout, stderr) ->
		console.log "stdout: #{stdout}" if stdout?.length
		console.log "stderr: #{stderr}" if stderr?.length
		console.log "exec error: #{error}" if error?
		running = false