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watcher.py

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+import sys
+import time
+import subprocess
+import os
+dir_to_watch=r"E:\Babu\pytry\robocon"
+file_to_watch=r"robo1.js.text"
+full_path=os.path.join(dir_to_watch,file_to_watch)
+def build_cmd():
+    a,b= subprocess.Popen(r'slideshow build '+file_to_watch+' -t impress.js', shell=True,cwd=dir_to_watch, stderr=subprocess.PIPE, stdout=subprocess.PIPE ).communicate()
+    return a
+from watchdog.observers import Observer
+from watchdog.tricks import LoggerTrick
+import watchdog
+
+print("Watching file "+full_path+" for any changes.. Dont close")
+
+class rebuild(watchdog.events.FileSystemEventHandler):
+    def on_any_event(self,event):
+        if event.src_path==full_path:
+            print("Re-building")
+            print(build_cmd())
+
+event_handler = rebuild()
+observer = Observer()
+observer.schedule(event_handler, dir_to_watch, recursive=True)
+observer.start()
+try:
+    while True:
+        time.sleep(1)
+except KeyboardInterrupt:
+    observer.stop()
+observer.join()
+