Simple dev server for transcrypt

transit.py

import sys, os, time
from collections import defaultdict
import re
import subprocess

SERVE_HTTP = False
if SERVE_HTTP:
    import http.server
    import socketserver

    PORT = 8000

    Handler = http.server.SimpleHTTPRequestHandler

    with socketserver.TCPServer(("", PORT), Handler) as httpd:
        print("serving at port", PORT)
        httpd.serve_forever()


JS_FOLDER = re.compile('__javascript__', re.I)


if __name__ == '__main__':
    print ("starting")
    print (sys.argv)
    try:
        targetfile = sys.argv[1]
    except IndexError:
        raise SystemExit("Please supply a root file when running this command")

    rootdir = os.path.dirname(os.path.abspath(targetfile))
    print ("watching {}".format (rootdir))


    call_args = ['transcrypt', targetfile] + sys.argv[2:]

    status = defaultdict(int)
    delay = 2
    while True:
        modded = False
        for root, dirs, files in os.walk(rootdir):
            if JS_FOLDER.search(root):
                continue
            for f in files:
                fullname = "{}/{}".format(root, f)
                modtime = os.path.getmtime(fullname)
                if status[fullname] != modtime:
                    status[fullname] = modtime
                    print (fullname)
                    modded = True

        removals = (filename for filename in status.keys() if not os.path.exists(filename))

        for r in removals:
            del status[r]
            modded = True

        if modded:
            print (call_args)
            result = subprocess.run(call_args, shell=True)
            print (result.stdout)
            delay = 10
        else:
            delay = 2
        time.sleep(delay)

    print ("server shutting down")

    if SERVE_HTTP:
        httpd.shutdown()