(dot)LESS Auto Compiler

gistfile1.py

#!/usr/bin/env python
#-*- coding:utf-8 -*-

import sys,os,re
import subprocess
import pyinotify

class OnWriteHandler(pyinotify.ProcessEvent):
	def my_init(self,cwd,extension,cmd):
		self.cwd=cwd
		self.extensions=extension.split(',')
		self.cmd=cmd

	def _run_cmd(self,event):
		print('==> file modification detected')
		print(event.pathname)
		source=event.pathname
		dest=''.join([os.path.splitext(event.pathname)[0],'.css'])
		cmd=self.cmd % (source,dest)
		subprocess.call(cmd.split(' '),cwd=self.cwd)

	def process_IN_MODIFY(self,event):
		if all(not event.pathname.endswith(ext) for ext in self.extensions):
			return
		self._run_cmd(event)

def auto_compile(path,extension,cmd):
	excl_lst=['.*/\.svn.*',
				'.*/\.config.*',
				'.*/\.local.*',
				'.*/\.cache.*',
				'.*/\.subversion.*',
				'.*/\.[^\/]*/.*']
	excl=pyinotify.ExcludeFilter(excl_lst)

	wm=pyinotify.WatchManager()
	handler=OnWriteHandler(cwd=path,extension=extension,cmd=cmd)
	notifier=pyinotify.Notifier(wm,default_proc_fun=handler)
	wm.add_watch(path,pyinotify.ALL_EVENTS,rec=True,auto_add=True)
	print('==> start monitoring %s (type cmd^c to exit)' % path)
	notifier.loop()

if __name__=='__main__':
	if len(sys.argv)<3:
		print >> sys.stderr,'command line error: missing argument(s).'
		sys.exit(1)
	
	path=sys.argv[1]
	extension=sys.argv[2]
	
	cmd='/home/liuhuo/env/less.js/bin/lessc %s %s'
	if len(sys.argv)==4:
		cmd=sys.argv[3]
	
	auto_compile(path,extension,cmd)