Fixup file watch example

examples/filesystem_watch.py

@@ -1,4 +1,6 @@
+
 from __future__ import print_function
+
 import pyuv
 import signal
 import sys
@@ -7,35 +9,40 @@
 
 
 def fsevent_callback(fsevent_handle, filename, events, error):
-    print('file: %s' % filename, ', events: ', events)
+    if error is not None:
+        txt = 'error %s: %s' % (error, pyuv.errno.strerror(error))
+    else:
+        evts = []
+        if events & pyuv.fs.UV_RENAME:
+            evts.append('rename')
+        if events & pyuv.fs.UV_CHANGE:
+            evts.append('change')
+        txt = 'events: %s' % ', '.join(evts)
+    print('file: %s, %s' % (filename, txt))
 
 
 def sig_cb(handle, signum):
     handle.close()
-    print('\nType ctrl-c again to exit')
 
 
 def main(path):
     loop = pyuv.Loop.default_loop()
     try:
         fsevents = pyuv.fs.FSEvent(loop)
         fsevents.start(path, 0, fsevent_callback)
-    except pyuv.error.FSEventError as err:
-        print('error', err)
+        fsevents.ref = False
+    except pyuv.error.FSEventError as e:
+        print('error: %s' % e)
         sys.exit(2)
-
     signal_h = pyuv.Signal(loop)
     signal_h.start(sig_cb, signal.SIGINT)
     print('Watching path %s' % os.path.abspath(path))
     loop.run()
 
 
 if __name__ == '__main__':
-
     parser = optparse.OptionParser()
-    parser.add_option('-p', '--path', help='a path to watch')
-    (opts, args) = parser.parse_args()
-    if opts.path is None:
-        parser.print_help()
-        sys.exit(2)
+    parser.add_option('-p', '--path', help='a path to watch', default='.')
+    opts, args = parser.parse_args()
     main(opts.path)
+