autoreload

autoreload.py

#!/usr/bin/env python

from os.path import getmtime
import sys, subprocess, time
import signal

usage = 'usage: autoreload "/bin/foo --bar" *.py'

try:
    cmd = sys.argv[1]
except IndexError:
    print 'nothing to restart'
    print usage
    sys.exit(1)

files = sys.argv[2:]
if len(files) == 0:
    print 'nothing to monitor'
    print usage
    sys.exit(1)

process = subprocess.Popen(cmd, shell=True)

def interrupt_process(sig, frame):
    process.send_signal(signal.SIGINT)
    sys.exit(signal.SIGINT)

signal.signal(signal.SIGINT, interrupt_process)

try:
    while True:
        mtimes = [(f, getmtime(f)) for f in files]
        time.sleep(1)
        for f, mtime in mtimes:
            if getmtime(f) > mtime:
                print 'AUTORELOAD: change detected in %s' % f
                print 'AUTORELOAD: stopping process "%s"' % cmd
                process.kill()
                print 'AUTORELOAD: starting process "%s"' % cmd
                process = subprocess.Popen(cmd, shell=True)
                break
except Exception as e:
    print e.message
    process.kill()