watcher.py

#!/usr/bin/env python
# 
# to install : sudo easy_install watchdog
#
import subprocess
import os
import time

import pynotify
from gobject import GError

from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler


class ChangeHandler(FileSystemEventHandler):
    """React to modified .tex files."""
    def on_any_event(self, event):
        """If a file or folder is changed."""
        if event.is_directory:
            return
        filename = os.path.basename(event.src_path)
        if os.path.splitext(filename)[-1].lower() == ".tex":
            os.chdir(os.path.dirname(event.src_path))
            pynotify.init("Compilation .tex")
            try:
                subprocess.check_call("make", shell=True)
            except subprocess.CalledProcessError:
                message = pynotify.Notification("Build %s failed." % filename)
            else:
                message = pynotify.Notification("Build %s done." % filename)
            try:
                message.show()
            except GError:
                print('Gerror')


def main():
    print("OK, I watch *.tex files !")
    handler = ChangeHandler()
    observer = Observer()
    observer.schedule(handler, '.', recursive=True)
    observer.start()
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()


if __name__ == '__main__':
    main()