Automatically compile .less and .coffee files

This small python script makes use of watchdog (and sh) to monitor your code directory (recursively) and build less and CoffeeScript files upon edit.

Simply launch it from the relevant folder and it will work in the background.

It should be trivial to add minification (and linting, but I suggest linting in the editor) to the process.

#!/usr/bin/env python2

import watchdog.events
import watchdog.observers
import sh
import time
import os

# Detach
if os.fork(): os._exit(0)

coffee = sh.coffee.bake('-c')
less = sh.lessc

class Handler(watchdog.events.PatternMatchingEventHandler):
    def __init__(self):
        watchdog.events.PatternMatchingEventHandler.__init__(self, patterns=['*.less', '*.coffee'],
            ignore_directories=True, case_sensitive=False)

    def on_modified(self, event):
        if event.src_path.lower().endswith('.less'):
            less(event.src_path, event.src_path[:-5] + '.css')
        if event.src_path.lower().endswith('.coffee'):
            coffee(event.src_path)

    on_created = on_modified

if __name__ == "__main__":
    event_handler = Handler()
    observer = watchdog.observers.Observer()
    observer.schedule(event_handler, path='.', recursive=True)
    observer.start()
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()

It requires coffee (npm install coffee-script) and lessc (npm install less).

Should be compatible with Mac OS X and Linux at least, BSD and Win... maybe.