Added minimal version of watchdog

Sublime/fl0w/watchdog/observers/read_directory_changes.py

@@ -0,0 +1,135 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2011 Yesudeep Mangalapilly <yesudeep@gmail.com>
+# Copyright 2012 Google, Inc.
+# Copyright 2014 Thomas Amland
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import with_statement
+
+import ctypes
+import threading
+import os.path
+import time
+
+from watchdog.events import (
+    DirCreatedEvent,
+    DirDeletedEvent,
+    DirMovedEvent,
+    DirModifiedEvent,
+    FileCreatedEvent,
+    FileDeletedEvent,
+    FileMovedEvent,
+    FileModifiedEvent,
+    generate_sub_moved_events,
+    generate_sub_created_events,
+)
+
+from watchdog.observers.api import (
+    EventEmitter,
+    BaseObserver,
+    DEFAULT_OBSERVER_TIMEOUT,
+    DEFAULT_EMITTER_TIMEOUT
+)
+
+from watchdog.observers.winapi import (
+    read_events,
+    get_directory_handle,
+    close_directory_handle,
+)
+
+
+# HACK:
+WATCHDOG_TRAVERSE_MOVED_DIR_DELAY = 1   # seconds
+
+
+class WindowsApiEmitter(EventEmitter):
+    """
+    Windows API-based emitter that uses ReadDirectoryChangesW
+    to detect file system changes for a watch.
+    """
+
+    def __init__(self, event_queue, watch, timeout=DEFAULT_EMITTER_TIMEOUT):
+        EventEmitter.__init__(self, event_queue, watch, timeout)
+        self._lock = threading.Lock()
+        self._handle = None
+
+    def on_thread_start(self):
+        self._handle = get_directory_handle(self.watch.path)
+
+    def on_thread_stop(self):
+        if self._handle:
+            close_directory_handle(self._handle)
+
+    def queue_events(self, timeout):
+        winapi_events = read_events(self._handle, self.watch.is_recursive)
+        with self._lock:
+            last_renamed_src_path = ""
+            for winapi_event in winapi_events:
+                src_path = os.path.join(self.watch.path, winapi_event.src_path)
+                
+                if winapi_event.is_renamed_old:
+                    last_renamed_src_path = src_path
+                elif winapi_event.is_renamed_new:
+                    dest_path = src_path
+                    src_path = last_renamed_src_path
+                    if os.path.isdir(dest_path):
+                        event = DirMovedEvent(src_path, dest_path)
+                        if self.watch.is_recursive:
+                            # HACK: We introduce a forced delay before
+                            # traversing the moved directory. This will read
+                            # only file movement that finishes within this
+                            # delay time.
+                            time.sleep(WATCHDOG_TRAVERSE_MOVED_DIR_DELAY)
+                            # The following block of code may not
+                            # obtain moved events for the entire tree if
+                            # the I/O is not completed within the above
+                            # delay time. So, it's not guaranteed to work.
+                            # TODO: Come up with a better solution, possibly
+                            # a way to wait for I/O to complete before
+                            # queuing events.
+                            for sub_moved_event in generate_sub_moved_events(src_path, dest_path):
+                                self.queue_event(sub_moved_event)
+                        self.queue_event(event)
+                    else:
+                        self.queue_event(FileMovedEvent(src_path, dest_path))
+                elif winapi_event.is_modified:
+                    cls = DirModifiedEvent if os.path.isdir(src_path) else FileModifiedEvent
+                    self.queue_event(cls(src_path))
+                elif winapi_event.is_added:
+                    isdir = os.path.isdir(src_path)
+                    cls = DirCreatedEvent if isdir else FileCreatedEvent
+                    self.queue_event(cls(src_path))
+                    if isdir:
+                        # If a directory is moved from outside the watched folder to inside it
+                        # we only get a created directory event out of it, not any events for its children
+                        # so use the same hack as for file moves to get the child events
+                        time.sleep(WATCHDOG_TRAVERSE_MOVED_DIR_DELAY)
+                        sub_events = generate_sub_created_events(src_path)
+                        for sub_created_event in sub_events:
+                            self.queue_event(sub_created_event)
+                elif winapi_event.is_removed:
+                    self.queue_event(FileDeletedEvent(src_path))
+
+
+class WindowsApiObserver(BaseObserver):
+    """
+    Observer thread that schedules watching directories and dispatches
+    calls to event handlers.
+    """
+
+    def __init__(self, timeout=DEFAULT_OBSERVER_TIMEOUT):
+        BaseObserver.__init__(self, emitter_class=WindowsApiEmitter,
+                              timeout=timeout)