Watches current directory and compiles the haskell source files when they are modified

HaskellCC.py

# Usage: python HaskellCC.py (Ctrl-C for exit)

import time
from datetime import datetime
import subprocess
from watchdog.observers import Observer
from watchdog.events import PatternMatchingEventHandler


class HaskellContinuousCompiler(PatternMatchingEventHandler):
    def on_modified(self, event):
        print "[%s] Compiling %s" % (datetime.now().strftime("%X"), event.src_path)
        try:
            subprocess.check_output(["ghc", "-c", event.src_path])
            print "[%s] Compiled %s" % (datetime.now().strftime("%X"), event.src_path)
        except subprocess.CalledProcessError:
            print
            print "[%s] Error while compiling %s" % (datetime.now().strftime("%X"), event.src_path)
        print "-------------------------------------------------------------"
        print

if __name__ == "__main__":
    event_handler = HaskellContinuousCompiler(patterns=["*.hs"], ignore_directories=True)
    observer = Observer()
    observer.schedule(event_handler, path='.')
    observer.start()
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()