added a flask venv

flask/venv/lib/python3.6/site-packages/watchdog/observers/__init__.py

@@ -0,0 +1,94 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2011 Yesudeep Mangalapilly <yesudeep@gmail.com>
+# Copyright 2012 Google, Inc.
+#
+# 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.
+
+"""
+:module: watchdog.observers
+:synopsis: Observer that picks a native implementation if available.
+:author: yesudeep@google.com (Yesudeep Mangalapilly)
+
+
+Classes
+=======
+.. autoclass:: Observer
+   :members:
+   :show-inheritance:
+   :inherited-members:
+   
+Observer thread that schedules watching directories and dispatches
+calls to event handlers.
+
+You can also import platform specific classes directly and use it instead
+of :class:`Observer`.  Here is a list of implemented observer classes.:
+
+============== ================================ ==============================
+Class          Platforms                        Note
+============== ================================ ==============================
+|Inotify|      Linux 2.6.13+                    ``inotify(7)`` based observer
+|FSEvents|     Mac OS X                         FSEvents based observer
+|Kqueue|       Mac OS X and BSD with kqueue(2)  ``kqueue(2)`` based observer
+|WinApi|       MS Windows                       Windows API-based observer
+|Polling|      Any                              fallback implementation
+============== ================================ ==============================
+
+.. |Inotify|     replace:: :class:`.inotify.InotifyObserver`
+.. |FSEvents|    replace:: :class:`.fsevents.FSEventsObserver`
+.. |Kqueue|      replace:: :class:`.kqueue.KqueueObserver`
+.. |WinApi|      replace:: :class:`.read_directory_changes.WindowsApiObserver`
+.. |WinApiAsync| replace:: :class:`.read_directory_changes_async.WindowsApiAsyncObserver`
+.. |Polling|     replace:: :class:`.polling.PollingObserver`
+
+"""
+
+import warnings
+from watchdog.utils import platform
+from watchdog.utils import UnsupportedLibc
+
+if platform.is_linux():
+    try:
+        from .inotify import InotifyObserver as Observer
+    except UnsupportedLibc:
+        from .polling import PollingObserver as Observer
+
+elif platform.is_darwin():
+    # FIXME: catching too broad. Error prone
+    try:
+        from .fsevents import FSEventsObserver as Observer
+    except:
+        try:
+            from .kqueue import KqueueObserver as Observer
+            warnings.warn("Failed to import fsevents. Fall back to kqueue")
+        except:
+            from .polling import PollingObserver as Observer
+            warnings.warn("Failed to import fsevents and kqueue. Fall back to polling.")
+
+elif platform.is_bsd():
+    from .kqueue import KqueueObserver as Observer
+
+elif platform.is_windows():
+    # TODO: find a reliable way of checking Windows version and import
+    # polling explicitly for Windows XP
+    try:
+        from .read_directory_changes import WindowsApiObserver as Observer
+    except:
+        from .polling import PollingObserver as Observer
+        warnings.warn("Failed to import read_directory_changes. Fall back to polling.")
+
+else:
+    from .polling import PollingObserver as Observer
+
+__all__ = ["Observer"]

flask/venv/lib/python3.6/site-packages/watchdog/observers/api.py

@@ -0,0 +1,369 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2011 Yesudeep Mangalapilly <yesudeep@gmail.com>
+# Copyright 2012 Google, Inc.
+#
+# 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 threading
+from watchdog.utils import BaseThread
+from watchdog.utils.compat import queue
+from watchdog.utils.bricks import SkipRepeatsQueue
+
+DEFAULT_EMITTER_TIMEOUT = 1    # in seconds.
+DEFAULT_OBSERVER_TIMEOUT = 1   # in seconds.
+
+
+# Collection classes
+class EventQueue(SkipRepeatsQueue):
+    """Thread-safe event queue based on a special queue that skips adding
+    the same event (:class:`FileSystemEvent`) multiple times consecutively.
+    Thus avoiding dispatching multiple event handling
+    calls when multiple identical events are produced quicker than an observer
+    can consume them.
+    """
+
+
+class ObservedWatch(object):
+    """An scheduled watch.
+
+    :param path:
+        Path string.
+    :param recursive:
+        ``True`` if watch is recursive; ``False`` otherwise.
+    """
+
+    def __init__(self, path, recursive):
+        self._path = path
+        self._is_recursive = recursive
+
+    @property
+    def path(self):
+        """The path that this watch monitors."""
+        return self._path
+
+    @property
+    def is_recursive(self):
+        """Determines whether subdirectories are watched for the path."""
+        return self._is_recursive
+
+    @property
+    def key(self):
+        return self.path, self.is_recursive
+
+    def __eq__(self, watch):
+        return self.key == watch.key
+
+    def __ne__(self, watch):
+        return self.key != watch.key
+
+    def __hash__(self):
+        return hash(self.key)
+
+    def __repr__(self):
+        return "<ObservedWatch: path=%s, is_recursive=%s>" % (
+            self.path, self.is_recursive)
+
+
+# Observer classes
+class EventEmitter(BaseThread):
+    """
+    Producer thread base class subclassed by event emitters
+    that generate events and populate a queue with them.
+
+    :param event_queue:
+        The event queue to populate with generated events.
+    :type event_queue:
+        :class:`watchdog.events.EventQueue`
+    :param watch:
+        The watch to observe and produce events for.
+    :type watch:
+        :class:`ObservedWatch`
+    :param timeout:
+        Timeout (in seconds) between successive attempts at reading events.
+    :type timeout:
+        ``float``
+    """
+
+    def __init__(self, event_queue, watch, timeout=DEFAULT_EMITTER_TIMEOUT):
+        BaseThread.__init__(self)
+        self._event_queue = event_queue
+        self._watch = watch
+        self._timeout = timeout
+
+    @property
+    def timeout(self):
+        """
+        Blocking timeout for reading events.
+        """
+        return self._timeout
+
+    @property
+    def watch(self):
+        """
+        The watch associated with this emitter.
+        """
+        return self._watch
+
+    def queue_event(self, event):
+        """
+        Queues a single event.
+
+        :param event:
+            Event to be queued.
+        :type event:
+            An instance of :class:`watchdog.events.FileSystemEvent`
+            or a subclass.
+        """
+        self._event_queue.put((event, self.watch))
+
+    def queue_events(self, timeout):
+        """Override this method to populate the event queue with events
+        per interval period.
+
+        :param timeout:
+            Timeout (in seconds) between successive attempts at
+            reading events.
+        :type timeout:
+            ``float``
+        """
+
+    def run(self):
+        try:
+            while self.should_keep_running():
+                self.queue_events(self.timeout)
+        finally:
+            pass
+
+
+class EventDispatcher(BaseThread):
+    """
+    Consumer thread base class subclassed by event observer threads
+    that dispatch events from an event queue to appropriate event handlers.
+
+    :param timeout:
+        Event queue blocking timeout (in seconds).
+    :type timeout:
+        ``float``
+    """
+
+    def __init__(self, timeout=DEFAULT_OBSERVER_TIMEOUT):
+        BaseThread.__init__(self)
+        self._event_queue = EventQueue()
+        self._timeout = timeout
+
+    @property
+    def timeout(self):
+        """Event queue block timeout."""
+        return self._timeout
+
+    @property
+    def event_queue(self):
+        """The event queue which is populated with file system events
+        by emitters and from which events are dispatched by a dispatcher
+        thread."""
+        return self._event_queue
+
+    def dispatch_events(self, event_queue, timeout):
+        """Override this method to consume events from an event queue, blocking
+        on the queue for the specified timeout before raising :class:`queue.Empty`.
+
+        :param event_queue:
+            Event queue to populate with one set of events.
+        :type event_queue:
+            :class:`EventQueue`
+        :param timeout:
+            Interval period (in seconds) to wait before timing out on the
+            event queue.
+        :type timeout:
+            ``float``
+        :raises:
+            :class:`queue.Empty`
+        """
+
+    def run(self):
+        while self.should_keep_running():
+            try:
+                self.dispatch_events(self.event_queue, self.timeout)
+            except queue.Empty:
+                continue
+
+
+class BaseObserver(EventDispatcher):
+    """Base observer."""
+
+    def __init__(self, emitter_class, timeout=DEFAULT_OBSERVER_TIMEOUT):
+        EventDispatcher.__init__(self, timeout)
+        self._emitter_class = emitter_class
+        self._lock = threading.RLock()
+        self._watches = set()
+        self._handlers = dict()
+        self._emitters = set()
+        self._emitter_for_watch = dict()
+
+    def _add_emitter(self, emitter):
+        self._emitter_for_watch[emitter.watch] = emitter
+        self._emitters.add(emitter)
+
+    def _remove_emitter(self, emitter):
+        del self._emitter_for_watch[emitter.watch]
+        self._emitters.remove(emitter)
+        emitter.stop()
+        try:
+            emitter.join()
+        except RuntimeError:
+            pass
+
+    def _clear_emitters(self):
+        for emitter in self._emitters:
+            emitter.stop()
+        for emitter in self._emitters:
+            try:
+                emitter.join()
+            except RuntimeError:
+                pass
+        self._emitters.clear()
+        self._emitter_for_watch.clear()
+
+    def _add_handler_for_watch(self, event_handler, watch):
+        if watch not in self._handlers:
+            self._handlers[watch] = set()
+        self._handlers[watch].add(event_handler)
+
+    def _remove_handlers_for_watch(self, watch):
+        del self._handlers[watch]
+
+    @property
+    def emitters(self):
+        """Returns event emitter created by this observer."""
+        return self._emitters
+
+    def start(self):
+        for emitter in self._emitters:
+            emitter.start()
+        super(BaseObserver, self).start()
+
+    def schedule(self, event_handler, path, recursive=False):
+        """
+        Schedules watching a path and calls appropriate methods specified
+        in the given event handler in response to file system events.
+
+        :param event_handler:
+            An event handler instance that has appropriate event handling
+            methods which will be called by the observer in response to
+            file system events.
+        :type event_handler:
+            :class:`watchdog.events.FileSystemEventHandler` or a subclass
+        :param path:
+            Directory path that will be monitored.
+        :type path:
+            ``str``
+        :param recursive:
+            ``True`` if events will be emitted for sub-directories
+            traversed recursively; ``False`` otherwise.
+        :type recursive:
+            ``bool``
+        :return:
+            An :class:`ObservedWatch` object instance representing
+            a watch.
+        """
+        with self._lock:
+            watch = ObservedWatch(path, recursive)
+            self._add_handler_for_watch(event_handler, watch)
+
+            # If we don't have an emitter for this watch already, create it.
+            if self._emitter_for_watch.get(watch) is None:
+                emitter = self._emitter_class(event_queue=self.event_queue,
+                                              watch=watch,
+                                              timeout=self.timeout)
+                self._add_emitter(emitter)
+                if self.is_alive():
+                    emitter.start()
+            self._watches.add(watch)
+        return watch
+
+    def add_handler_for_watch(self, event_handler, watch):
+        """Adds a handler for the given watch.
+
+        :param event_handler:
+            An event handler instance that has appropriate event handling
+            methods which will be called by the observer in response to
+            file system events.
+        :type event_handler:
+            :class:`watchdog.events.FileSystemEventHandler` or a subclass
+        :param watch:
+            The watch to add a handler for.
+        :type watch:
+            An instance of :class:`ObservedWatch` or a subclass of
+            :class:`ObservedWatch`
+        """
+        with self._lock:
+            self._add_handler_for_watch(event_handler, watch)
+
+    def remove_handler_for_watch(self, event_handler, watch):
+        """Removes a handler for the given watch.
+
+        :param event_handler:
+            An event handler instance that has appropriate event handling
+            methods which will be called by the observer in response to
+            file system events.
+        :type event_handler:
+            :class:`watchdog.events.FileSystemEventHandler` or a subclass
+        :param watch:
+            The watch to remove a handler for.
+        :type watch:
+            An instance of :class:`ObservedWatch` or a subclass of
+            :class:`ObservedWatch`
+        """
+        with self._lock:
+            self._handlers[watch].remove(event_handler)
+
+    def unschedule(self, watch):
+        """Unschedules a watch.
+
+        :param watch:
+            The watch to unschedule.
+        :type watch:
+            An instance of :class:`ObservedWatch` or a subclass of
+            :class:`ObservedWatch`
+        """
+        with self._lock:
+            emitter = self._emitter_for_watch[watch]
+            del self._handlers[watch]
+            self._remove_emitter(emitter)
+            self._watches.remove(watch)
+
+    def unschedule_all(self):
+        """Unschedules all watches and detaches all associated event
+        handlers."""
+        with self._lock:
+            self._handlers.clear()
+            self._clear_emitters()
+            self._watches.clear()
+
+    def on_thread_stop(self):
+        self.unschedule_all()
+
+    def dispatch_events(self, event_queue, timeout):
+        event, watch = event_queue.get(block=True, timeout=timeout)
+
+        with self._lock:
+            # To allow unschedule/stop and safe removal of event handlers
+            # within event handlers itself, check if the handler is still
+            # registered after every dispatch.
+            for handler in list(self._handlers.get(watch, [])):
+                if handler in self._handlers.get(watch, []):
+                    handler.dispatch(event)
+        event_queue.task_done()

flask/venv/lib/python3.6/site-packages/watchdog/observers/fsevents.py

@@ -0,0 +1,172 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2011 Yesudeep Mangalapilly <yesudeep@gmail.com>
+# Copyright 2012 Google, Inc.
+#
+# 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.
+
+"""
+:module: watchdog.observers.fsevents
+:synopsis: FSEvents based emitter implementation.
+:author: yesudeep@google.com (Yesudeep Mangalapilly)
+:platforms: Mac OS X
+"""
+
+from __future__ import with_statement
+
+import sys
+import threading
+import unicodedata
+import _watchdog_fsevents as _fsevents
+
+from watchdog.events import (
+    FileDeletedEvent,
+    FileModifiedEvent,
+    FileCreatedEvent,
+    FileMovedEvent,
+    DirDeletedEvent,
+    DirModifiedEvent,
+    DirCreatedEvent,
+    DirMovedEvent
+)
+
+from watchdog.utils.dirsnapshot import DirectorySnapshot
+from watchdog.observers.api import (
+    BaseObserver,
+    EventEmitter,
+    DEFAULT_EMITTER_TIMEOUT,
+    DEFAULT_OBSERVER_TIMEOUT
+)
+
+
+class FSEventsEmitter(EventEmitter):
+
+    """
+    Mac OS X FSEvents Emitter class.
+
+    :param event_queue:
+        The event queue to fill with events.
+    :param watch:
+        A watch object representing the directory to monitor.
+    :type watch:
+        :class:`watchdog.observers.api.ObservedWatch`
+    :param timeout:
+        Read events blocking timeout (in seconds).
+    :type timeout:
+        ``float``
+    """
+
+    def __init__(self, event_queue, watch, timeout=DEFAULT_EMITTER_TIMEOUT):
+        EventEmitter.__init__(self, event_queue, watch, timeout)
+        self._lock = threading.Lock()
+        self.snapshot = DirectorySnapshot(watch.path, watch.is_recursive)
+
+    def on_thread_stop(self):
+        _fsevents.remove_watch(self.watch)
+        _fsevents.stop(self)
+
+    def queue_events(self, timeout):
+        with self._lock:
+            if not self.watch.is_recursive\
+                and self.watch.path not in self.pathnames:
+                return
+            new_snapshot = DirectorySnapshot(self.watch.path,
+                                             self.watch.is_recursive)
+            events = new_snapshot - self.snapshot
+            self.snapshot = new_snapshot
+
+            # Files.
+            for src_path in events.files_deleted:
+                self.queue_event(FileDeletedEvent(src_path))
+            for src_path in events.files_modified:
+                self.queue_event(FileModifiedEvent(src_path))
+            for src_path in events.files_created:
+                self.queue_event(FileCreatedEvent(src_path))
+            for src_path, dest_path in events.files_moved:
+                self.queue_event(FileMovedEvent(src_path, dest_path))
+
+            # Directories.
+            for src_path in events.dirs_deleted:
+                self.queue_event(DirDeletedEvent(src_path))
+            for src_path in events.dirs_modified:
+                self.queue_event(DirModifiedEvent(src_path))
+            for src_path in events.dirs_created:
+                self.queue_event(DirCreatedEvent(src_path))
+            for src_path, dest_path in events.dirs_moved:
+                self.queue_event(DirMovedEvent(src_path, dest_path))
+
+    def run(self):
+        try:
+            def callback(pathnames, flags, emitter=self):
+                emitter.queue_events(emitter.timeout)
+
+            # for pathname, flag in zip(pathnames, flags):
+            # if emitter.watch.is_recursive: # and pathname != emitter.watch.path:
+            #    new_sub_snapshot = DirectorySnapshot(pathname, True)
+            #    old_sub_snapshot = self.snapshot.copy(pathname)
+            #    diff = new_sub_snapshot - old_sub_snapshot
+            #    self.snapshot += new_subsnapshot
+            # else:
+            #    new_snapshot = DirectorySnapshot(emitter.watch.path, False)
+            #    diff = new_snapshot - emitter.snapshot
+            #    emitter.snapshot = new_snapshot
+
+            # INFO: FSEvents reports directory notifications recursively
+            # by default, so we do not need to add subdirectory paths.
+            #pathnames = set([self.watch.path])
+            # if self.watch.is_recursive:
+            #    for root, directory_names, _ in os.walk(self.watch.path):
+            #        for directory_name in directory_names:
+            #            full_path = absolute_path(
+            #                            os.path.join(root, directory_name))
+            #            pathnames.add(full_path)
+            self.pathnames = [self.watch.path]
+            _fsevents.add_watch(self,
+                                self.watch,
+                                callback,
+                                self.pathnames)
+            _fsevents.read_events(self)
+        except:
+            pass
+
+
+class FSEventsObserver(BaseObserver):
+
+    def __init__(self, timeout=DEFAULT_OBSERVER_TIMEOUT):
+        BaseObserver.__init__(self, emitter_class=FSEventsEmitter,
+                              timeout=timeout)
+
+    def schedule(self, event_handler, path, recursive=False):
+        # Python 2/3 compat
+        try:
+            str_class = unicode
+        except NameError:
+            str_class = str
+
+        # Fix for issue #26: Trace/BPT error when given a unicode path
+        # string. https://github.com/gorakhargosh/watchdog/issues#issue/26
+        if isinstance(path, str_class):
+            #path = unicode(path, 'utf-8')
+            path = unicodedata.normalize('NFC', path)
+            # We only encode the path in Python 2 for backwards compatibility.
+            # On Python 3 we want the path to stay as unicode if possible for
+            # the sake of path matching not having to be rewritten to use the
+            # bytes API instead of strings. The _watchdog_fsevent.so code for
+            # Python 3 can handle both str and bytes paths, which is why we
+            # do not HAVE to encode it with Python 3. The Python 2 code in
+            # _watchdog_fsevents.so was not changed for the sake of backwards
+            # compatibility.
+            if sys.version_info < (3,):
+                path = path.encode('utf-8')
+        return BaseObserver.schedule(self, event_handler, path, recursive)

flask/venv/lib/python3.6/site-packages/watchdog/observers/fsevents2.py

@@ -0,0 +1,239 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2014 Thomas Amland <thomas.amland@gmail.com>
+#
+# 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.
+
+"""
+:module: watchdog.observers.fsevents2
+:synopsis: FSEvents based emitter implementation.
+:platforms: Mac OS X
+"""
+
+import os
+import logging
+import unicodedata
+from threading import Thread
+from watchdog.utils.compat import queue
+
+from watchdog.events import (
+    FileDeletedEvent,
+    FileModifiedEvent,
+    FileCreatedEvent,
+    FileMovedEvent,
+    DirDeletedEvent,
+    DirModifiedEvent,
+    DirCreatedEvent,
+    DirMovedEvent
+)
+from watchdog.observers.api import (
+    BaseObserver,
+    EventEmitter,
+    DEFAULT_EMITTER_TIMEOUT,
+    DEFAULT_OBSERVER_TIMEOUT,
+)
+
+# pyobjc
+import AppKit
+from FSEvents import (
+    FSEventStreamCreate,
+    CFRunLoopGetCurrent,
+    FSEventStreamScheduleWithRunLoop,
+    FSEventStreamStart,
+    CFRunLoopRun,
+    CFRunLoopStop,
+    FSEventStreamStop,
+    FSEventStreamInvalidate,
+    FSEventStreamRelease,
+)
+
+from FSEvents import (
+    kCFAllocatorDefault,
+    kCFRunLoopDefaultMode,
+    kFSEventStreamEventIdSinceNow,
+    kFSEventStreamCreateFlagNoDefer,
+    kFSEventStreamCreateFlagFileEvents,
+    kFSEventStreamEventFlagItemCreated,
+    kFSEventStreamEventFlagItemRemoved,
+    kFSEventStreamEventFlagItemInodeMetaMod,
+    kFSEventStreamEventFlagItemRenamed,
+    kFSEventStreamEventFlagItemModified,
+    kFSEventStreamEventFlagItemFinderInfoMod,
+    kFSEventStreamEventFlagItemChangeOwner,
+    kFSEventStreamEventFlagItemXattrMod,
+    kFSEventStreamEventFlagItemIsDir,
+    kFSEventStreamEventFlagItemIsSymlink,
+)
+
+logger = logging.getLogger(__name__)
+
+
+class FSEventsQueue(Thread):
+    """ Low level FSEvents client. """
+
+    def __init__(self, path):
+        Thread.__init__(self)
+        self._queue = queue.Queue()
+        self._run_loop = None
+
+        if isinstance(path, bytes):
+            path = path.decode('utf-8')
+        self._path = unicodedata.normalize('NFC', path)
+
+        context = None
+        latency = 1.0
+        self._stream_ref = FSEventStreamCreate(
+            kCFAllocatorDefault, self._callback, context, [self._path],
+            kFSEventStreamEventIdSinceNow, latency,
+            kFSEventStreamCreateFlagNoDefer | kFSEventStreamCreateFlagFileEvents)
+        if self._stream_ref is None:
+            raise IOError("FSEvents. Could not create stream.")
+
+    def run(self):
+        pool = AppKit.NSAutoreleasePool.alloc().init()
+        self._run_loop = CFRunLoopGetCurrent()
+        FSEventStreamScheduleWithRunLoop(
+            self._stream_ref, self._run_loop, kCFRunLoopDefaultMode)
+        if not FSEventStreamStart(self._stream_ref):
+            FSEventStreamInvalidate(self._stream_ref)
+            FSEventStreamRelease(self._stream_ref)
+            raise IOError("FSEvents. Could not start stream.")
+
+        CFRunLoopRun()
+        FSEventStreamStop(self._stream_ref)
+        FSEventStreamInvalidate(self._stream_ref)
+        FSEventStreamRelease(self._stream_ref)
+        del pool
+        # Make sure waiting thread is notified
+        self._queue.put(None)
+
+    def stop(self):
+        if self._run_loop is not None:
+            CFRunLoopStop(self._run_loop)
+
+    def _callback(self, streamRef, clientCallBackInfo, numEvents, eventPaths, eventFlags, eventIDs):
+        events = [NativeEvent(path, flags, _id) for path, flags, _id in
+                  zip(eventPaths, eventFlags, eventIDs)]
+        logger.debug("FSEvents callback. Got %d events:" % numEvents)
+        for e in events:
+            logger.debug(e)
+        self._queue.put(events)
+
+    def read_events(self):
+        """
+        Returns a list or one or more events, or None if there are no more
+        events to be read.
+        """
+        if not self.is_alive():
+            return None
+        return self._queue.get()
+
+
+class NativeEvent(object):
+    def __init__(self, path, flags, event_id):
+        self.path = path
+        self.flags = flags
+        self.event_id = event_id
+        self.is_created = bool(flags & kFSEventStreamEventFlagItemCreated)
+        self.is_removed = bool(flags & kFSEventStreamEventFlagItemRemoved)
+        self.is_renamed = bool(flags & kFSEventStreamEventFlagItemRenamed)
+        self.is_modified = bool(flags & kFSEventStreamEventFlagItemModified)
+        self.is_change_owner = bool(flags & kFSEventStreamEventFlagItemChangeOwner)
+        self.is_inode_meta_mod = bool(flags & kFSEventStreamEventFlagItemInodeMetaMod)
+        self.is_finder_info_mod = bool(flags & kFSEventStreamEventFlagItemFinderInfoMod)
+        self.is_xattr_mod = bool(flags & kFSEventStreamEventFlagItemXattrMod)
+        self.is_symlink = bool(flags & kFSEventStreamEventFlagItemIsSymlink)
+        self.is_directory = bool(flags & kFSEventStreamEventFlagItemIsDir)
+
+    @property
+    def _event_type(self):
+        if self.is_created: return "Created"
+        if self.is_removed: return "Removed"
+        if self.is_renamed: return "Renamed"
+        if self.is_modified: return "Modified"
+        if self.is_inode_meta_mod: return "InodeMetaMod"
+        if self.is_xattr_mod: return "XattrMod"
+        return "Unknown"
+
+    def __repr__(self):
+        s ="<NativeEvent: path=%s, type=%s, is_dir=%s, flags=%s, id=%s>"
+        return s % (repr(self.path), self._event_type, self.is_directory, hex(self.flags), self.event_id)
+
+
+class FSEventsEmitter(EventEmitter):
+    """
+    FSEvents based event emitter. Handles conversion of native events.
+    """
+
+    def __init__(self, event_queue, watch, timeout=DEFAULT_EMITTER_TIMEOUT):
+        EventEmitter.__init__(self, event_queue, watch, timeout)
+        self._fsevents = FSEventsQueue(watch.path)
+        self._fsevents.start()
+
+    def on_thread_stop(self):
+        self._fsevents.stop()
+
+    def queue_events(self, timeout):
+        events = self._fsevents.read_events()
+        if events is None:
+            return
+        i = 0
+        while i < len(events):
+            event = events[i]
+
+            # For some reason the create and remove flags are sometimes also
+            # set for rename and modify type events, so let those take
+            # precedence.
+            if event.is_renamed:
+                # Internal moves appears to always be consecutive in the same
+                # buffer and have IDs differ by exactly one (while others
+                # don't) making it possible to pair up the two events coming
+                # from a singe move operation. (None of this is documented!)
+                # Otherwise, guess whether file was moved in or out.
+                #TODO: handle id wrapping
+                if (i+1 < len(events) and events[i+1].is_renamed and
+                        events[i+1].event_id == event.event_id + 1):
+                    cls = DirMovedEvent if event.is_directory else FileMovedEvent
+                    self.queue_event(cls(event.path, events[i+1].path))
+                    self.queue_event(DirModifiedEvent(os.path.dirname(event.path)))
+                    self.queue_event(DirModifiedEvent(os.path.dirname(events[i+1].path)))
+                    i += 1
+                elif os.path.exists(event.path):
+                    cls = DirCreatedEvent if event.is_directory else FileCreatedEvent
+                    self.queue_event(cls(event.path))
+                    self.queue_event(DirModifiedEvent(os.path.dirname(event.path)))
+                else:
+                    cls = DirDeletedEvent if event.is_directory else FileDeletedEvent
+                    self.queue_event(cls(event.path))
+                    self.queue_event(DirModifiedEvent(os.path.dirname(event.path)))
+                #TODO: generate events for tree
+
+            elif event.is_modified or event.is_inode_meta_mod or event.is_xattr_mod :
+                cls = DirModifiedEvent if event.is_directory else FileModifiedEvent
+                self.queue_event(cls(event.path))
+
+            elif event.is_created:
+                cls = DirCreatedEvent if event.is_directory else FileCreatedEvent
+                self.queue_event(cls(event.path))
+                self.queue_event(DirModifiedEvent(os.path.dirname(event.path)))
+
+            elif event.is_removed:
+                cls = DirDeletedEvent if event.is_directory else FileDeletedEvent
+                self.queue_event(cls(event.path))
+                self.queue_event(DirModifiedEvent(os.path.dirname(event.path)))
+            i += 1
+
+
+class FSEventsObserver2(BaseObserver):
+    def __init__(self, timeout=DEFAULT_OBSERVER_TIMEOUT):
+        BaseObserver.__init__(self, emitter_class=FSEventsEmitter, timeout=timeout)

flask/venv/lib/python3.6/site-packages/watchdog/observers/inotify.py

@@ -0,0 +1,218 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2011 Yesudeep Mangalapilly <yesudeep@gmail.com>
+# Copyright 2012 Google, Inc.
+#
+# 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.
+
+"""
+:module: watchdog.observers.inotify
+:synopsis: ``inotify(7)`` based emitter implementation.
+:author: Sebastien Martini <seb@dbzteam.org>
+:author: Luke McCarthy <luke@iogopro.co.uk>
+:author: yesudeep@google.com (Yesudeep Mangalapilly)
+:author: Tim Cuthbertson <tim+github@gfxmonk.net>
+:platforms: Linux 2.6.13+.
+
+.. ADMONITION:: About system requirements
+
+    Recommended minimum kernel version: 2.6.25.
+
+    Quote from the inotify(7) man page:
+
+        "Inotify was merged into the 2.6.13 Linux kernel. The required library
+        interfaces were added to glibc in version 2.4. (IN_DONT_FOLLOW,
+        IN_MASK_ADD, and IN_ONLYDIR were only added in version 2.5.)"
+
+    Therefore, you must ensure the system is running at least these versions
+    appropriate libraries and the kernel.
+
+.. ADMONITION:: About recursiveness, event order, and event coalescing
+
+    Quote from the inotify(7) man page:
+
+        If successive output inotify events produced on the inotify file
+        descriptor are identical (same wd, mask, cookie, and name) then they
+        are coalesced into a single event if the older event has not yet been
+        read (but see BUGS).
+
+        The events returned by reading from an inotify file descriptor form
+        an ordered queue. Thus, for example, it is guaranteed that when
+        renaming from one directory to another, events will be produced in
+        the correct order on the inotify file descriptor.
+
+        ...
+
+        Inotify monitoring of directories is not recursive: to monitor
+        subdirectories under a directory, additional watches must be created.
+
+    This emitter implementation therefore automatically adds watches for
+    sub-directories if running in recursive mode.
+
+Some extremely useful articles and documentation:
+
+.. _inotify FAQ: http://inotify.aiken.cz/?section=inotify&page=faq&lang=en
+.. _intro to inotify: http://www.linuxjournal.com/article/8478
+
+"""
+
+from __future__ import with_statement
+
+import os
+import threading
+from .inotify_buffer import InotifyBuffer
+
+from watchdog.observers.api import (
+    EventEmitter,
+    BaseObserver,
+    DEFAULT_EMITTER_TIMEOUT,
+    DEFAULT_OBSERVER_TIMEOUT
+)
+
+from watchdog.events import (
+    DirDeletedEvent,
+    DirModifiedEvent,
+    DirMovedEvent,
+    DirCreatedEvent,
+    FileDeletedEvent,
+    FileModifiedEvent,
+    FileMovedEvent,
+    FileCreatedEvent,
+    generate_sub_moved_events,
+    generate_sub_created_events,
+)
+from watchdog.utils import unicode_paths
+
+
+class InotifyEmitter(EventEmitter):
+    """
+    inotify(7)-based event emitter.
+
+    :param event_queue:
+        The event queue to fill with events.
+    :param watch:
+        A watch object representing the directory to monitor.
+    :type watch:
+        :class:`watchdog.observers.api.ObservedWatch`
+    :param timeout:
+        Read events blocking timeout (in seconds).
+    :type timeout:
+        ``float``
+    """
+
+    def __init__(self, event_queue, watch, timeout=DEFAULT_EMITTER_TIMEOUT):
+        EventEmitter.__init__(self, event_queue, watch, timeout)
+        self._lock = threading.Lock()
+        self._inotify = None
+
+    def on_thread_start(self):
+        path = unicode_paths.encode(self.watch.path)
+        self._inotify = InotifyBuffer(path, self.watch.is_recursive)
+
+    def on_thread_stop(self):
+        if self._inotify:
+            self._inotify.close()
+
+    def queue_events(self, timeout, full_events=False):
+        #If "full_events" is true, then the method will report unmatched move events as seperate events
+        #This behavior is by default only called by a InotifyFullEmitter
+        with self._lock:
+            event = self._inotify.read_event()
+            if event is None:
+                return
+            if isinstance(event, tuple):
+                move_from, move_to = event
+                src_path = self._decode_path(move_from.src_path)
+                dest_path = self._decode_path(move_to.src_path)
+                cls = DirMovedEvent if move_from.is_directory else FileMovedEvent
+                self.queue_event(cls(src_path, dest_path))
+                self.queue_event(DirModifiedEvent(os.path.dirname(src_path)))
+                self.queue_event(DirModifiedEvent(os.path.dirname(dest_path)))
+                if move_from.is_directory and self.watch.is_recursive:
+                    for sub_event in generate_sub_moved_events(src_path, dest_path):
+                        self.queue_event(sub_event)
+                return
+
+            src_path = self._decode_path(event.src_path)
+            if event.is_moved_to:
+                if (full_events):
+                    cls = DirMovedEvent if event.is_directory else FileMovedEvent
+                    self.queue_event(cls(None, src_path))
+                else:
+                    cls = DirCreatedEvent if event.is_directory else FileCreatedEvent
+                    self.queue_event(cls(src_path))
+                self.queue_event(DirModifiedEvent(os.path.dirname(src_path)))
+                if event.is_directory and self.watch.is_recursive:
+                    for sub_event in generate_sub_created_events(src_path):
+                        self.queue_event(sub_event)
+            elif event.is_attrib:
+                cls = DirModifiedEvent if event.is_directory else FileModifiedEvent
+                self.queue_event(cls(src_path))
+            elif event.is_modify:
+                cls = DirModifiedEvent if event.is_directory else FileModifiedEvent
+                self.queue_event(cls(src_path))
+            elif event.is_delete or (event.is_moved_from and not full_events):
+                cls = DirDeletedEvent if event.is_directory else FileDeletedEvent
+                self.queue_event(cls(src_path))
+                self.queue_event(DirModifiedEvent(os.path.dirname(src_path)))
+            elif event.is_moved_from and full_events:
+                cls = DirMovedEvent if event.is_directory else FileMovedEvent
+                self.queue_event(cls(src_path, None))
+                self.queue_event(DirModifiedEvent(os.path.dirname(src_path)))
+            elif event.is_create:
+                cls = DirCreatedEvent if event.is_directory else FileCreatedEvent
+                self.queue_event(cls(src_path))
+                self.queue_event(DirModifiedEvent(os.path.dirname(src_path)))
+
+    def _decode_path(self, path):
+        """ Decode path only if unicode string was passed to this emitter. """
+        if isinstance(self.watch.path, bytes):
+            return path
+        return unicode_paths.decode(path)
+
+
+class InotifyFullEmitter(InotifyEmitter):
+    """
+    inotify(7)-based event emitter. By default this class produces move events even if they are not matched
+    Such move events will have a ``None`` value for the unmatched part.
+
+    :param event_queue:
+        The event queue to fill with events.
+    :param watch:
+        A watch object representing the directory to monitor.
+    :type watch:
+        :class:`watchdog.observers.api.ObservedWatch`
+    :param timeout:
+        Read events blocking timeout (in seconds).
+    :type timeout:
+        ``float``
+    """
+    def __init__(self, event_queue, watch, timeout=DEFAULT_EMITTER_TIMEOUT):
+        InotifyEmitter.__init__(self, event_queue, watch, timeout)
+        
+    def queue_events(self, timeout, events=True):
+        InotifyEmitter.queue_events(self, timeout, full_events=events)
+
+class InotifyObserver(BaseObserver):
+    """
+    Observer thread that schedules watching directories and dispatches
+    calls to event handlers.
+    """
+
+    def __init__(self, timeout=DEFAULT_OBSERVER_TIMEOUT, generate_full_events=False):
+        if (generate_full_events):
+            BaseObserver.__init__(self, emitter_class=InotifyFullEmitter, timeout=timeout)
+        else:
+            BaseObserver.__init__(self, emitter_class=InotifyEmitter,
+                              timeout=timeout)

flask/venv/lib/python3.6/site-packages/watchdog/observers/inotify_buffer.py

@@ -0,0 +1,81 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2014 Thomas Amland <thomas.amland@gmail.com>
+#
+# 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.
+
+import logging
+from watchdog.utils import BaseThread
+from watchdog.utils.delayed_queue import DelayedQueue
+from watchdog.observers.inotify_c import Inotify
+
+logger = logging.getLogger(__name__)
+
+
+class InotifyBuffer(BaseThread):
+    """A wrapper for `Inotify` that holds events for `delay` seconds. During
+    this time, IN_MOVED_FROM and IN_MOVED_TO events are paired.
+    """
+
+    delay = 0.5
+
+    def __init__(self, path, recursive=False):
+        BaseThread.__init__(self)
+        self._queue = DelayedQueue(self.delay)
+        self._inotify = Inotify(path, recursive)
+        self.start()
+
+    def read_event(self):
+        """Returns a single event or a tuple of from/to events in case of a
+        paired move event. If this buffer has been closed, immediately return
+        None.
+        """
+        return self._queue.get()
+
+    def on_thread_stop(self):
+        self._inotify.close()
+        self._queue.close()
+
+    def close(self):
+        self.stop()
+        self.join()
+
+    def run(self):
+        """Read event from `inotify` and add them to `queue`. When reading a
+        IN_MOVE_TO event, remove the previous added matching IN_MOVE_FROM event
+        and add them back to the queue as a tuple.
+        """
+        deleted_self = False
+        while self.should_keep_running() and not deleted_self:
+            inotify_events = self._inotify.read_events()
+            for inotify_event in inotify_events:
+                logger.debug("in-event %s", inotify_event)
+                if inotify_event.is_moved_to:
+
+                    def matching_from_event(event):
+                        return (not isinstance(event, tuple) and event.is_moved_from
+                                and event.cookie == inotify_event.cookie)
+
+                    from_event = self._queue.remove(matching_from_event)
+                    if from_event is not None:
+                        self._queue.put((from_event, inotify_event))
+                    else:
+                        logger.debug("could not find matching move_from event")
+                        self._queue.put(inotify_event)
+                else:
+                    self._queue.put(inotify_event)
+
+                if inotify_event.is_delete_self and \
+                        inotify_event.src_path == self._inotify.path:
+                    # Deleted the watched directory, stop watching for events
+                    deleted_self = True

flask/venv/lib/python3.6/site-packages/watchdog/observers/inotify_c.py

@@ -0,0 +1,575 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2011 Yesudeep Mangalapilly <yesudeep@gmail.com>
+# Copyright 2012 Google, Inc.
+#
+# 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 os
+import errno
+import struct
+import threading
+import ctypes
+import ctypes.util
+from functools import reduce
+from ctypes import c_int, c_char_p, c_uint32
+from watchdog.utils import has_attribute
+from watchdog.utils import UnsupportedLibc
+
+
+def _load_libc():
+    libc_path = None
+    try:
+        libc_path = ctypes.util.find_library('c')
+    except (OSError, IOError, RuntimeError):
+        # Note: find_library will on some platforms raise these undocumented
+        # errors, e.g.on android IOError "No usable temporary directory found"
+        # will be raised.
+        pass
+
+    if libc_path is not None:
+        return ctypes.CDLL(libc_path)
+
+    # Fallbacks
+    try:
+        return ctypes.CDLL('libc.so')
+    except (OSError, IOError):
+        pass
+
+    try:
+        return ctypes.CDLL('libc.so.6')
+    except (OSError, IOError):
+        pass
+
+    # uClibc
+    try:
+        return ctypes.CDLL('libc.so.0')
+    except (OSError, IOError) as err:
+        raise err
+
+
+libc = _load_libc()
+
+if not has_attribute(libc, 'inotify_init') or \
+        not has_attribute(libc, 'inotify_add_watch') or \
+        not has_attribute(libc, 'inotify_rm_watch'):
+    raise UnsupportedLibc("Unsupported libc version found: %s" % libc._name)
+
+inotify_add_watch = ctypes.CFUNCTYPE(c_int, c_int, c_char_p, c_uint32, use_errno=True)(
+    ("inotify_add_watch", libc))
+
+inotify_rm_watch = ctypes.CFUNCTYPE(c_int, c_int, c_uint32, use_errno=True)(
+    ("inotify_rm_watch", libc))
+
+inotify_init = ctypes.CFUNCTYPE(c_int, use_errno=True)(
+    ("inotify_init", libc))
+
+
+class InotifyConstants(object):
+    # User-space events
+    IN_ACCESS = 0x00000001     # File was accessed.
+    IN_MODIFY = 0x00000002     # File was modified.
+    IN_ATTRIB = 0x00000004     # Meta-data changed.
+    IN_CLOSE_WRITE = 0x00000008     # Writable file was closed.
+    IN_CLOSE_NOWRITE = 0x00000010     # Unwritable file closed.
+    IN_OPEN = 0x00000020     # File was opened.
+    IN_MOVED_FROM = 0x00000040     # File was moved from X.
+    IN_MOVED_TO = 0x00000080     # File was moved to Y.
+    IN_CREATE = 0x00000100     # Subfile was created.
+    IN_DELETE = 0x00000200     # Subfile was deleted.
+    IN_DELETE_SELF = 0x00000400     # Self was deleted.
+    IN_MOVE_SELF = 0x00000800     # Self was moved.
+
+    # Helper user-space events.
+    IN_CLOSE = IN_CLOSE_WRITE | IN_CLOSE_NOWRITE  # Close.
+    IN_MOVE = IN_MOVED_FROM | IN_MOVED_TO  # Moves.
+
+    # Events sent by the kernel to a watch.
+    IN_UNMOUNT = 0x00002000     # Backing file system was unmounted.
+    IN_Q_OVERFLOW = 0x00004000     # Event queued overflowed.
+    IN_IGNORED = 0x00008000     # File was ignored.
+
+    # Special flags.
+    IN_ONLYDIR = 0x01000000     # Only watch the path if it's a directory.
+    IN_DONT_FOLLOW = 0x02000000     # Do not follow a symbolic link.
+    IN_EXCL_UNLINK = 0x04000000     # Exclude events on unlinked objects
+    IN_MASK_ADD = 0x20000000     # Add to the mask of an existing watch.
+    IN_ISDIR = 0x40000000     # Event occurred against directory.
+    IN_ONESHOT = 0x80000000     # Only send event once.
+
+    # All user-space events.
+    IN_ALL_EVENTS = reduce(
+        lambda x, y: x | y, [
+            IN_ACCESS,
+            IN_MODIFY,
+            IN_ATTRIB,
+            IN_CLOSE_WRITE,
+            IN_CLOSE_NOWRITE,
+            IN_OPEN,
+            IN_MOVED_FROM,
+            IN_MOVED_TO,
+            IN_DELETE,
+            IN_CREATE,
+            IN_DELETE_SELF,
+            IN_MOVE_SELF,
+        ])
+
+    # Flags for ``inotify_init1``
+    IN_CLOEXEC = 0x02000000
+    IN_NONBLOCK = 0x00004000
+
+
+# Watchdog's API cares only about these events.
+WATCHDOG_ALL_EVENTS = reduce(
+    lambda x, y: x | y, [
+        InotifyConstants.IN_MODIFY,
+        InotifyConstants.IN_ATTRIB,
+        InotifyConstants.IN_MOVED_FROM,
+        InotifyConstants.IN_MOVED_TO,
+        InotifyConstants.IN_CREATE,
+        InotifyConstants.IN_DELETE,
+        InotifyConstants.IN_DELETE_SELF,
+        InotifyConstants.IN_DONT_FOLLOW,
+    ])
+
+
+class inotify_event_struct(ctypes.Structure):
+    """
+    Structure representation of the inotify_event structure
+    (used in buffer size calculations)::
+
+        struct inotify_event {
+            __s32 wd;            /* watch descriptor */
+            __u32 mask;          /* watch mask */
+            __u32 cookie;        /* cookie to synchronize two events */
+            __u32 len;           /* length (including nulls) of name */
+            char  name[0];       /* stub for possible name */
+        };
+    """
+    _fields_ = [('wd', c_int),
+                ('mask', c_uint32),
+                ('cookie', c_uint32),
+                ('len', c_uint32),
+                ('name', c_char_p)]
+
+
+EVENT_SIZE = ctypes.sizeof(inotify_event_struct)
+DEFAULT_NUM_EVENTS = 2048
+DEFAULT_EVENT_BUFFER_SIZE = DEFAULT_NUM_EVENTS * (EVENT_SIZE + 16)
+
+
+class Inotify(object):
+    """
+    Linux inotify(7) API wrapper class.
+
+    :param path:
+        The directory path for which we want an inotify object.
+    :type path:
+        :class:`bytes`
+    :param recursive:
+        ``True`` if subdirectories should be monitored; ``False`` otherwise.
+    """
+
+    def __init__(self, path, recursive=False, event_mask=WATCHDOG_ALL_EVENTS):
+        # The file descriptor associated with the inotify instance.
+        inotify_fd = inotify_init()
+        if inotify_fd == -1:
+            Inotify._raise_error()
+        self._inotify_fd = inotify_fd
+        self._lock = threading.Lock()
+
+        # Stores the watch descriptor for a given path.
+        self._wd_for_path = dict()
+        self._path_for_wd = dict()
+
+        self._path = path
+        self._event_mask = event_mask
+        self._is_recursive = recursive
+        self._add_dir_watch(path, recursive, event_mask)
+        self._moved_from_events = dict()
+
+    @property
+    def event_mask(self):
+        """The event mask for this inotify instance."""
+        return self._event_mask
+
+    @property
+    def path(self):
+        """The path associated with the inotify instance."""
+        return self._path
+
+    @property
+    def is_recursive(self):
+        """Whether we are watching directories recursively."""
+        return self._is_recursive
+
+    @property
+    def fd(self):
+        """The file descriptor associated with the inotify instance."""
+        return self._inotify_fd
+
+    def clear_move_records(self):
+        """Clear cached records of MOVED_FROM events"""
+        self._moved_from_events = dict()
+
+    def source_for_move(self, destination_event):
+        """
+        The source path corresponding to the given MOVED_TO event.
+
+        If the source path is outside the monitored directories, None
+        is returned instead.
+        """
+        if destination_event.cookie in self._moved_from_events:
+            return self._moved_from_events[destination_event.cookie].src_path
+        else:
+            return None
+
+    def remember_move_from_event(self, event):
+        """
+        Save this event as the source event for future MOVED_TO events to
+        reference.
+        """
+        self._moved_from_events[event.cookie] = event
+
+    def add_watch(self, path):
+        """
+        Adds a watch for the given path.
+
+        :param path:
+            Path to begin monitoring.
+        """
+        with self._lock:
+            self._add_watch(path, self._event_mask)
+
+    def remove_watch(self, path):
+        """
+        Removes a watch for the given path.
+
+        :param path:
+            Path string for which the watch will be removed.
+        """
+        with self._lock:
+            wd = self._wd_for_path.pop(path)
+            del self._path_for_wd[wd]
+            if inotify_rm_watch(self._inotify_fd, wd) == -1:
+                Inotify._raise_error()
+
+    def close(self):
+        """
+        Closes the inotify instance and removes all associated watches.
+        """
+        with self._lock:
+            if self._path in self._wd_for_path:
+                wd = self._wd_for_path[self._path]
+                inotify_rm_watch(self._inotify_fd, wd)
+            os.close(self._inotify_fd)
+
+    def read_events(self, event_buffer_size=DEFAULT_EVENT_BUFFER_SIZE):
+        """
+        Reads events from inotify and yields them.
+        """
+        # HACK: We need to traverse the directory path
+        # recursively and simulate events for newly
+        # created subdirectories/files. This will handle
+        # mkdir -p foobar/blah/bar; touch foobar/afile
+
+        def _recursive_simulate(src_path):
+            events = []
+            for root, dirnames, filenames in os.walk(src_path):
+                for dirname in dirnames:
+                    try:
+                        full_path = os.path.join(root, dirname)
+                        wd_dir = self._add_watch(full_path, self._event_mask)
+                        e = InotifyEvent(
+                            wd_dir, InotifyConstants.IN_CREATE | InotifyConstants.IN_ISDIR, 0, dirname, full_path)
+                        events.append(e)
+                    except OSError:
+                        pass
+                for filename in filenames:
+                    full_path = os.path.join(root, filename)
+                    wd_parent_dir = self._wd_for_path[os.path.dirname(full_path)]
+                    e = InotifyEvent(
+                        wd_parent_dir, InotifyConstants.IN_CREATE, 0, filename, full_path)
+                    events.append(e)
+            return events
+
+        event_buffer = None
+        while True:
+            try:
+                event_buffer = os.read(self._inotify_fd, event_buffer_size)
+            except OSError as e:
+                if e.errno == errno.EINTR:
+                    continue
+            break
+
+        with self._lock:
+            event_list = []
+            for wd, mask, cookie, name in Inotify._parse_event_buffer(event_buffer):
+                if wd == -1:
+                    continue
+                wd_path = self._path_for_wd[wd]
+                src_path = os.path.join(wd_path, name) if name else wd_path #avoid trailing slash
+                inotify_event = InotifyEvent(wd, mask, cookie, name, src_path)
+
+                if inotify_event.is_moved_from:
+                    self.remember_move_from_event(inotify_event)
+                elif inotify_event.is_moved_to:
+                    move_src_path = self.source_for_move(inotify_event)
+                    if move_src_path in self._wd_for_path:
+                        moved_wd = self._wd_for_path[move_src_path]
+                        del self._wd_for_path[move_src_path]
+                        self._wd_for_path[inotify_event.src_path] = moved_wd
+                        self._path_for_wd[moved_wd] = inotify_event.src_path
+                    src_path = os.path.join(wd_path, name)
+                    inotify_event = InotifyEvent(wd, mask, cookie, name, src_path)
+
+                if inotify_event.is_ignored:
+                    # Clean up book-keeping for deleted watches.
+                    path = self._path_for_wd.pop(wd)
+                    if self._wd_for_path[path] == wd:
+                        del self._wd_for_path[path]
+                    continue
+
+                event_list.append(inotify_event)
+
+                if (self.is_recursive and inotify_event.is_directory and
+                        inotify_event.is_create):
+
+                    # TODO: When a directory from another part of the
+                    # filesystem is moved into a watched directory, this
+                    # will not generate events for the directory tree.
+                    # We need to coalesce IN_MOVED_TO events and those
+                    # IN_MOVED_TO events which don't pair up with
+                    # IN_MOVED_FROM events should be marked IN_CREATE
+                    # instead relative to this directory.
+                    try:
+                        self._add_watch(src_path, self._event_mask)
+                    except OSError:
+                        continue
+
+                    event_list.extend(_recursive_simulate(src_path))
+
+        return event_list
+
+    # Non-synchronized methods.
+    def _add_dir_watch(self, path, recursive, mask):
+        """
+        Adds a watch (optionally recursively) for the given directory path
+        to monitor events specified by the mask.
+
+        :param path:
+            Path to monitor
+        :param recursive:
+            ``True`` to monitor recursively.
+        :param mask:
+            Event bit mask.
+        """
+        if not os.path.isdir(path):
+            raise OSError('Path is not a directory')
+        self._add_watch(path, mask)
+        if recursive:
+            for root, dirnames, _ in os.walk(path):
+                for dirname in dirnames:
+                    full_path = os.path.join(root, dirname)
+                    if os.path.islink(full_path):
+                        continue
+                    self._add_watch(full_path, mask)
+
+    def _add_watch(self, path, mask):
+        """
+        Adds a watch for the given path to monitor events specified by the
+        mask.
+
+        :param path:
+            Path to monitor
+        :param mask:
+            Event bit mask.
+        """
+        wd = inotify_add_watch(self._inotify_fd, path, mask)
+        if wd == -1:
+            Inotify._raise_error()
+        self._wd_for_path[path] = wd
+        self._path_for_wd[wd] = path
+        return wd
+
+    @staticmethod
+    def _raise_error():
+        """
+        Raises errors for inotify failures.
+        """
+        err = ctypes.get_errno()
+        if err == errno.ENOSPC:
+            raise OSError("inotify watch limit reached")
+        elif err == errno.EMFILE:
+            raise OSError("inotify instance limit reached")
+        else:
+            raise OSError(os.strerror(err))
+
+    @staticmethod
+    def _parse_event_buffer(event_buffer):
+        """
+        Parses an event buffer of ``inotify_event`` structs returned by
+        inotify::
+
+            struct inotify_event {
+                __s32 wd;            /* watch descriptor */
+                __u32 mask;          /* watch mask */
+                __u32 cookie;        /* cookie to synchronize two events */
+                __u32 len;           /* length (including nulls) of name */
+                char  name[0];       /* stub for possible name */
+            };
+
+        The ``cookie`` member of this struct is used to pair two related
+        events, for example, it pairs an IN_MOVED_FROM event with an
+        IN_MOVED_TO event.
+        """
+        i = 0
+        while i + 16 <= len(event_buffer):
+            wd, mask, cookie, length = struct.unpack_from('iIII', event_buffer, i)
+            name = event_buffer[i + 16:i + 16 + length].rstrip(b'\0')
+            i += 16 + length
+            yield wd, mask, cookie, name
+
+
+class InotifyEvent(object):
+    """
+    Inotify event struct wrapper.
+
+    :param wd:
+        Watch descriptor
+    :param mask:
+        Event mask
+    :param cookie:
+        Event cookie
+    :param name:
+        Event name.
+    :param src_path:
+        Event source path
+    """
+
+    def __init__(self, wd, mask, cookie, name, src_path):
+        self._wd = wd
+        self._mask = mask
+        self._cookie = cookie
+        self._name = name
+        self._src_path = src_path
+
+    @property
+    def src_path(self):
+        return self._src_path
+
+    @property
+    def wd(self):
+        return self._wd
+
+    @property
+    def mask(self):
+        return self._mask
+
+    @property
+    def cookie(self):
+        return self._cookie
+
+    @property
+    def name(self):
+        return self._name
+
+    @property
+    def is_modify(self):
+        return self._mask & InotifyConstants.IN_MODIFY > 0
+
+    @property
+    def is_close_write(self):
+        return self._mask & InotifyConstants.IN_CLOSE_WRITE > 0
+
+    @property
+    def is_close_nowrite(self):
+        return self._mask & InotifyConstants.IN_CLOSE_NOWRITE > 0
+
+    @property
+    def is_access(self):
+        return self._mask & InotifyConstants.IN_ACCESS > 0
+
+    @property
+    def is_delete(self):
+        return self._mask & InotifyConstants.IN_DELETE > 0
+
+    @property
+    def is_delete_self(self):
+        return self._mask & InotifyConstants.IN_DELETE_SELF > 0
+
+    @property
+    def is_create(self):
+        return self._mask & InotifyConstants.IN_CREATE > 0
+
+    @property
+    def is_moved_from(self):
+        return self._mask & InotifyConstants.IN_MOVED_FROM > 0
+
+    @property
+    def is_moved_to(self):
+        return self._mask & InotifyConstants.IN_MOVED_TO > 0
+
+    @property
+    def is_move(self):
+        return self._mask & InotifyConstants.IN_MOVE > 0
+
+    @property
+    def is_move_self(self):
+        return self._mask & InotifyConstants.IN_MOVE_SELF > 0
+
+    @property
+    def is_attrib(self):
+        return self._mask & InotifyConstants.IN_ATTRIB > 0
+
+    @property
+    def is_ignored(self):
+        return self._mask & InotifyConstants.IN_IGNORED > 0
+
+    @property
+    def is_directory(self):
+        # It looks like the kernel does not provide this information for
+        # IN_DELETE_SELF and IN_MOVE_SELF. In this case, assume it's a dir.
+        # See also: https://github.com/seb-m/pyinotify/blob/2c7e8f8/python2/pyinotify.py#L897
+        return (self.is_delete_self or self.is_move_self or
+                self._mask & InotifyConstants.IN_ISDIR > 0)
+
+    @property
+    def key(self):
+        return self._src_path, self._wd, self._mask, self._cookie, self._name
+
+    def __eq__(self, inotify_event):
+        return self.key == inotify_event.key
+
+    def __ne__(self, inotify_event):
+        return self.key == inotify_event.key
+
+    def __hash__(self):
+        return hash(self.key)
+
+    @staticmethod
+    def _get_mask_string(mask):
+        masks = []
+        for c in dir(InotifyConstants):
+            if c.startswith('IN_') and c not in ['IN_ALL_EVENTS', 'IN_CLOSE', 'IN_MOVE']:
+                c_val = getattr(InotifyConstants, c)
+                if mask & c_val:
+                    masks.append(c)
+        mask_string = '|'.join(masks)
+        return mask_string
+
+    def __repr__(self):
+        mask_string = self._get_mask_string(self.mask)
+        s = "<InotifyEvent: src_path=%s, wd=%d, mask=%s, cookie=%d, name=%s>"
+        return s % (self.src_path, self.wd, mask_string, self.cookie, self.name)

flask/venv/lib/python3.6/site-packages/watchdog/observers/kqueue.py

@@ -0,0 +1,726 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2011 Yesudeep Mangalapilly <yesudeep@gmail.com>
+# Copyright 2012 Google, Inc.
+#
+# 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.
+
+"""
+:module: watchdog.observers.kqueue
+:synopsis: ``kqueue(2)`` based emitter implementation.
+:author: yesudeep@google.com (Yesudeep Mangalapilly)
+:platforms: Mac OS X and BSD with kqueue(2).
+
+.. WARNING:: kqueue is a very heavyweight way to monitor file systems.
+             Each kqueue-detected directory modification triggers
+             a full directory scan. Traversing the entire directory tree
+             and opening file descriptors for all files will create
+             performance problems. We need to find a way to re-scan
+             only those directories which report changes and do a diff
+             between two sub-DirectorySnapshots perhaps.
+
+.. ADMONITION:: About ``select.kqueue`` and Python versions
+
+    * Python 2.5 does not ship with ``select.kqueue``
+    * Python 2.6 ships with a broken ``select.kqueue`` that cannot take
+      multiple events in the event list passed to ``kqueue.control``.
+    * Python 2.7 ships with a working ``select.kqueue``
+      implementation.
+
+    I have backported the Python 2.7 implementation to Python 2.5 and 2.6
+    in the ``select_backport`` package available on PyPI.
+
+.. ADMONITION:: About OS X performance guidelines
+
+    Quote from the `Mac OS X File System Performance Guidelines`_:
+
+        "When you only want to track changes on a file or directory, be sure to
+        open it using the ``O_EVTONLY`` flag. This flag prevents the file or
+        directory from being marked as open or in use. This is important
+        if you are tracking files on a removable volume and the user tries to
+        unmount the volume. With this flag in place, the system knows it can
+        dismiss the volume. If you had opened the files or directories without
+        this flag, the volume would be marked as busy and would not be
+        unmounted."
+
+    ``O_EVTONLY`` is defined as ``0x8000`` in the OS X header files.
+    More information here: http://www.mlsite.net/blog/?p=2312
+
+Classes
+-------
+.. autoclass:: KqueueEmitter
+   :members:
+   :show-inheritance:
+
+Collections and Utility Classes
+-------------------------------
+.. autoclass:: KeventDescriptor
+   :members:
+   :show-inheritance:
+
+.. autoclass:: KeventDescriptorSet
+   :members:
+   :show-inheritance:
+
+.. _Mac OS X File System Performance Guidelines: http://developer.apple.com/library/ios/#documentation/Performance/Conceptual/FileSystem/Articles/TrackingChanges.html#//apple_ref/doc/uid/20001993-CJBJFIDD
+
+"""
+
+from __future__ import with_statement
+from watchdog.utils import platform
+
+import threading
+import errno
+import sys
+import stat
+import os
+
+# See the notes for this module in the documentation above ^.
+#import select
+# if not has_attribute(select, 'kqueue') or sys.version_info < (2, 7, 0):
+if sys.version_info < (2, 7, 0):
+    import select_backport as select
+else:
+    import select
+
+from pathtools.path import absolute_path
+
+from watchdog.observers.api import (
+    BaseObserver,
+    EventEmitter,
+    DEFAULT_OBSERVER_TIMEOUT,
+    DEFAULT_EMITTER_TIMEOUT
+)
+
+from watchdog.utils.dirsnapshot import DirectorySnapshot
+
+from watchdog.events import (
+    DirMovedEvent,
+    DirDeletedEvent,
+    DirCreatedEvent,
+    DirModifiedEvent,
+    FileMovedEvent,
+    FileDeletedEvent,
+    FileCreatedEvent,
+    FileModifiedEvent,
+    EVENT_TYPE_MOVED,
+    EVENT_TYPE_DELETED,
+    EVENT_TYPE_CREATED
+)
+
+# Maximum number of events to process.
+MAX_EVENTS = 4096
+
+# O_EVTONLY value from the header files for OS X only.
+O_EVTONLY = 0x8000
+
+# Pre-calculated values for the kevent filter, flags, and fflags attributes.
+if platform.is_darwin():
+    WATCHDOG_OS_OPEN_FLAGS = O_EVTONLY
+else:
+    WATCHDOG_OS_OPEN_FLAGS = os.O_RDONLY | os.O_NONBLOCK
+WATCHDOG_KQ_FILTER = select.KQ_FILTER_VNODE
+WATCHDOG_KQ_EV_FLAGS = select.KQ_EV_ADD | select.KQ_EV_ENABLE | select.KQ_EV_CLEAR
+WATCHDOG_KQ_FFLAGS = (
+    select.KQ_NOTE_DELETE |
+    select.KQ_NOTE_WRITE |
+    select.KQ_NOTE_EXTEND |
+    select.KQ_NOTE_ATTRIB |
+    select.KQ_NOTE_LINK |
+    select.KQ_NOTE_RENAME |
+    select.KQ_NOTE_REVOKE
+)
+
+# Flag tests.
+
+
+def is_deleted(kev):
+    """Determines whether the given kevent represents deletion."""
+    return kev.fflags & select.KQ_NOTE_DELETE
+
+
+def is_modified(kev):
+    """Determines whether the given kevent represents modification."""
+    fflags = kev.fflags
+    return (fflags & select.KQ_NOTE_EXTEND) or (fflags & select.KQ_NOTE_WRITE)
+
+
+def is_attrib_modified(kev):
+    """Determines whether the given kevent represents attribute modification."""
+    return kev.fflags & select.KQ_NOTE_ATTRIB
+
+
+def is_renamed(kev):
+    """Determines whether the given kevent represents movement."""
+    return kev.fflags & select.KQ_NOTE_RENAME
+
+
+class KeventDescriptorSet(object):
+
+    """
+    Thread-safe kevent descriptor collection.
+    """
+
+    def __init__(self):
+        # Set of KeventDescriptor
+        self._descriptors = set()
+
+        # Descriptor for a given path.
+        self._descriptor_for_path = dict()
+
+        # Descriptor for a given fd.
+        self._descriptor_for_fd = dict()
+
+        # List of kevent objects.
+        self._kevents = list()
+
+        self._lock = threading.Lock()
+
+    @property
+    def kevents(self):
+        """
+        List of kevents monitored.
+        """
+        with self._lock:
+            return self._kevents
+
+    @property
+    def paths(self):
+        """
+        List of paths for which kevents have been created.
+        """
+        with self._lock:
+            return list(self._descriptor_for_path.keys())
+
+    def get_for_fd(self, fd):
+        """
+        Given a file descriptor, returns the kevent descriptor object
+        for it.
+
+        :param fd:
+            OS file descriptor.
+        :type fd:
+            ``int``
+        :returns:
+            A :class:`KeventDescriptor` object.
+        """
+        with self._lock:
+            return self._descriptor_for_fd[fd]
+
+    def get(self, path):
+        """
+        Obtains a :class:`KeventDescriptor` object for the specified path.
+
+        :param path:
+            Path for which the descriptor will be obtained.
+        """
+        with self._lock:
+            path = absolute_path(path)
+            return self._get(path)
+
+    def __contains__(self, path):
+        """
+        Determines whether a :class:`KeventDescriptor has been registered
+        for the specified path.
+
+        :param path:
+            Path for which the descriptor will be obtained.
+        """
+        with self._lock:
+            path = absolute_path(path)
+            return self._has_path(path)
+
+    def add(self, path, is_directory):
+        """
+        Adds a :class:`KeventDescriptor` to the collection for the given
+        path.
+
+        :param path:
+            The path for which a :class:`KeventDescriptor` object will be
+            added.
+        :param is_directory:
+            ``True`` if the path refers to a directory; ``False`` otherwise.
+        :type is_directory:
+            ``bool``
+        """
+        with self._lock:
+            path = absolute_path(path)
+            if not self._has_path(path):
+                self._add_descriptor(KeventDescriptor(path, is_directory))
+
+    def remove(self, path):
+        """
+        Removes the :class:`KeventDescriptor` object for the given path
+        if it already exists.
+
+        :param path:
+            Path for which the :class:`KeventDescriptor` object will be
+            removed.
+        """
+        with self._lock:
+            path = absolute_path(path)
+            if self._has_path(path):
+                self._remove_descriptor(self._get(path))
+
+    def clear(self):
+        """
+        Clears the collection and closes all open descriptors.
+        """
+        with self._lock:
+            for descriptor in self._descriptors:
+                descriptor.close()
+            self._descriptors.clear()
+            self._descriptor_for_fd.clear()
+            self._descriptor_for_path.clear()
+            self._kevents = []
+
+    # Thread-unsafe methods. Locking is provided at a higher level.
+    def _get(self, path):
+        """Returns a kevent descriptor for a given path."""
+        return self._descriptor_for_path[path]
+
+    def _has_path(self, path):
+        """Determines whether a :class:`KeventDescriptor` for the specified
+   path exists already in the collection."""
+        return path in self._descriptor_for_path
+
+    def _add_descriptor(self, descriptor):
+        """
+        Adds a descriptor to the collection.
+
+        :param descriptor:
+            An instance of :class:`KeventDescriptor` to be added.
+        """
+        self._descriptors.add(descriptor)
+        self._kevents.append(descriptor.kevent)
+        self._descriptor_for_path[descriptor.path] = descriptor
+        self._descriptor_for_fd[descriptor.fd] = descriptor
+
+    def _remove_descriptor(self, descriptor):
+        """
+        Removes a descriptor from the collection.
+
+        :param descriptor:
+            An instance of :class:`KeventDescriptor` to be removed.
+        """
+        self._descriptors.remove(descriptor)
+        del self._descriptor_for_fd[descriptor.fd]
+        del self._descriptor_for_path[descriptor.path]
+        self._kevents.remove(descriptor.kevent)
+        descriptor.close()
+
+
+class KeventDescriptor(object):
+
+    """
+    A kevent descriptor convenience data structure to keep together:
+
+        * kevent
+        * directory status
+        * path
+        * file descriptor
+
+    :param path:
+        Path string for which a kevent descriptor will be created.
+    :param is_directory:
+        ``True`` if the path refers to a directory; ``False`` otherwise.
+    :type is_directory:
+        ``bool``
+    """
+
+    def __init__(self, path, is_directory):
+        self._path = absolute_path(path)
+        self._is_directory = is_directory
+        self._fd = os.open(path, WATCHDOG_OS_OPEN_FLAGS)
+        self._kev = select.kevent(self._fd,
+                                  filter=WATCHDOG_KQ_FILTER,
+                                  flags=WATCHDOG_KQ_EV_FLAGS,
+                                  fflags=WATCHDOG_KQ_FFLAGS)
+
+    @property
+    def fd(self):
+        """OS file descriptor for the kevent descriptor."""
+        return self._fd
+
+    @property
+    def path(self):
+        """The path associated with the kevent descriptor."""
+        return self._path
+
+    @property
+    def kevent(self):
+        """The kevent object associated with the kevent descriptor."""
+        return self._kev
+
+    @property
+    def is_directory(self):
+        """Determines whether the kevent descriptor refers to a directory.
+
+        :returns:
+            ``True`` or ``False``
+        """
+        return self._is_directory
+
+    def close(self):
+        """
+        Closes the file descriptor associated with a kevent descriptor.
+        """
+        try:
+            os.close(self.fd)
+        except OSError:
+            pass
+
+    @property
+    def key(self):
+        return (self.path, self.is_directory)
+
+    def __eq__(self, descriptor):
+        return self.key == descriptor.key
+
+    def __ne__(self, descriptor):
+        return self.key != descriptor.key
+
+    def __hash__(self):
+        return hash(self.key)
+
+    def __repr__(self):
+        return "<KeventDescriptor: path=%s, is_directory=%s>"\
+            % (self.path, self.is_directory)
+
+
+class KqueueEmitter(EventEmitter):
+
+    """
+    kqueue(2)-based event emitter.
+
+    .. ADMONITION:: About ``kqueue(2)`` behavior and this implementation
+
+              ``kqueue(2)`` monitors file system events only for
+              open descriptors, which means, this emitter does a lot of
+              book-keeping behind the scenes to keep track of open
+              descriptors for every entry in the monitored directory tree.
+
+              This also means the number of maximum open file descriptors
+              on your system must be increased **manually**.
+              Usually, issuing a call to ``ulimit`` should suffice::
+
+                  ulimit -n 1024
+
+              Ensure that you pick a number that is larger than the
+              number of files you expect to be monitored.
+
+              ``kqueue(2)`` does not provide enough information about the
+              following things:
+
+              * The destination path of a file or directory that is renamed.
+              * Creation of a file or directory within a directory; in this
+                case, ``kqueue(2)`` only indicates a modified event on the
+                parent directory.
+
+              Therefore, this emitter takes a snapshot of the directory
+              tree when ``kqueue(2)`` detects a change on the file system
+              to be able to determine the above information.
+
+    :param event_queue:
+        The event queue to fill with events.
+    :param watch:
+        A watch object representing the directory to monitor.
+    :type watch:
+        :class:`watchdog.observers.api.ObservedWatch`
+    :param timeout:
+        Read events blocking timeout (in seconds).
+    :type timeout:
+        ``float``
+    """
+
+    def __init__(self, event_queue, watch, timeout=DEFAULT_EMITTER_TIMEOUT):
+        EventEmitter.__init__(self, event_queue, watch, timeout)
+
+        self._kq = select.kqueue()
+        self._lock = threading.RLock()
+
+        # A collection of KeventDescriptor.
+        self._descriptors = KeventDescriptorSet()
+
+        def walker_callback(path, stat_info, self=self):
+            self._register_kevent(path, stat.S_ISDIR(stat_info.st_mode))
+
+        self._snapshot = DirectorySnapshot(watch.path,
+                                           watch.is_recursive,
+                                           walker_callback)
+
+    def _register_kevent(self, path, is_directory):
+        """
+        Registers a kevent descriptor for the given path.
+
+        :param path:
+            Path for which a kevent descriptor will be created.
+        :param is_directory:
+            ``True`` if the path refers to a directory; ``False`` otherwise.
+        :type is_directory:
+            ``bool``
+        """
+        try:
+            self._descriptors.add(path, is_directory)
+        except OSError as e:
+            if e.errno == errno.ENOENT:
+                # Probably dealing with a temporary file that was created
+                # and then quickly deleted before we could open
+                # a descriptor for it. Therefore, simply queue a sequence
+                # of created and deleted events for the path.
+                #path = absolute_path(path)
+                # if is_directory:
+                #    self.queue_event(DirCreatedEvent(path))
+                #    self.queue_event(DirDeletedEvent(path))
+                # else:
+                #    self.queue_event(FileCreatedEvent(path))
+                #    self.queue_event(FileDeletedEvent(path))
+
+                # TODO: We could simply ignore these files.
+                # Locked files cause the python process to die with
+                # a bus error when we handle temporary files.
+                # eg. .git/index.lock when running tig operations.
+                # I don't fully understand this at the moment.
+                pass
+            else:
+                # All other errors are propagated.
+                raise
+
+    def _unregister_kevent(self, path):
+        """
+        Convenience function to close the kevent descriptor for a
+        specified kqueue-monitored path.
+
+        :param path:
+            Path for which the kevent descriptor will be closed.
+        """
+        self._descriptors.remove(path)
+
+    def queue_event(self, event):
+        """
+        Handles queueing a single event object.
+
+        :param event:
+            An instance of :class:`watchdog.events.FileSystemEvent`
+            or a subclass.
+        """
+        # Handles all the book keeping for queued events.
+        # We do not need to fire moved/deleted events for all subitems in
+        # a directory tree here, because this function is called by kqueue
+        # for all those events anyway.
+        EventEmitter.queue_event(self, event)
+        if event.event_type == EVENT_TYPE_CREATED:
+            self._register_kevent(event.src_path, event.is_directory)
+        elif event.event_type == EVENT_TYPE_MOVED:
+            self._unregister_kevent(event.src_path)
+            self._register_kevent(event.dest_path, event.is_directory)
+        elif event.event_type == EVENT_TYPE_DELETED:
+            self._unregister_kevent(event.src_path)
+
+    def _queue_dirs_modified(self,
+                             dirs_modified,
+                             ref_snapshot,
+                             new_snapshot):
+        """
+        Queues events for directory modifications by scanning the directory
+        for changes.
+
+        A scan is a comparison between two snapshots of the same directory
+        taken at two different times. This also determines whether files
+        or directories were created, which updated the modified timestamp
+        for the directory.
+        """
+        if dirs_modified:
+            for dir_modified in dirs_modified:
+                self.queue_event(DirModifiedEvent(dir_modified))
+            diff_events = new_snapshot - ref_snapshot
+            for file_created in diff_events.files_created:
+                self.queue_event(FileCreatedEvent(file_created))
+            for directory_created in diff_events.dirs_created:
+                self.queue_event(DirCreatedEvent(directory_created))
+
+    def _queue_events_except_renames_and_dir_modifications(self, event_list):
+        """
+        Queues events from the kevent list returned from the call to
+        :meth:`select.kqueue.control`.
+
+        .. NOTE:: Queues only the deletions, file modifications,
+                  attribute modifications. The other events, namely,
+                  file creation, directory modification, file rename,
+                  directory rename, directory creation, etc. are
+                  determined by comparing directory snapshots.
+        """
+        files_renamed = set()
+        dirs_renamed = set()
+        dirs_modified = set()
+
+        for kev in event_list:
+            descriptor = self._descriptors.get_for_fd(kev.ident)
+            src_path = descriptor.path
+
+            if is_deleted(kev):
+                if descriptor.is_directory:
+                    self.queue_event(DirDeletedEvent(src_path))
+                else:
+                    self.queue_event(FileDeletedEvent(src_path))
+            elif is_attrib_modified(kev):
+                if descriptor.is_directory:
+                    self.queue_event(DirModifiedEvent(src_path))
+                else:
+                    self.queue_event(FileModifiedEvent(src_path))
+            elif is_modified(kev):
+                if descriptor.is_directory:
+                    # When a directory is modified, it may be due to
+                    # sub-file/directory renames or new file/directory
+                    # creation. We determine all this by comparing
+                    # snapshots later.
+                    dirs_modified.add(src_path)
+                else:
+                    self.queue_event(FileModifiedEvent(src_path))
+            elif is_renamed(kev):
+                # Kqueue does not specify the destination names for renames
+                # to, so we have to process these after taking a snapshot
+                # of the directory.
+                if descriptor.is_directory:
+                    dirs_renamed.add(src_path)
+                else:
+                    files_renamed.add(src_path)
+        return files_renamed, dirs_renamed, dirs_modified
+
+    def _queue_renamed(self,
+                       src_path,
+                       is_directory,
+                       ref_snapshot,
+                       new_snapshot):
+        """
+        Compares information from two directory snapshots (one taken before
+        the rename operation and another taken right after) to determine the
+        destination path of the file system object renamed, and adds
+        appropriate events to the event queue.
+        """
+        try:
+            ref_stat_info = ref_snapshot.stat_info(src_path)
+        except KeyError:
+            # Probably caught a temporary file/directory that was renamed
+            # and deleted. Fires a sequence of created and deleted events
+            # for the path.
+            if is_directory:
+                self.queue_event(DirCreatedEvent(src_path))
+                self.queue_event(DirDeletedEvent(src_path))
+            else:
+                self.queue_event(FileCreatedEvent(src_path))
+                self.queue_event(FileDeletedEvent(src_path))
+                # We don't process any further and bail out assuming
+            # the event represents deletion/creation instead of movement.
+            return
+
+        try:
+            dest_path = absolute_path(
+                new_snapshot.path_for_inode(ref_stat_info.st_ino))
+            if is_directory:
+                event = DirMovedEvent(src_path, dest_path)
+                # TODO: Do we need to fire moved events for the items
+                # inside the directory tree? Does kqueue does this
+                # all by itself? Check this and then enable this code
+                # only if it doesn't already.
+                # A: It doesn't. So I've enabled this block.
+                if self.watch.is_recursive:
+                    for sub_event in event.sub_moved_events():
+                        self.queue_event(sub_event)
+                self.queue_event(event)
+            else:
+                self.queue_event(FileMovedEvent(src_path, dest_path))
+        except KeyError:
+            # If the new snapshot does not have an inode for the
+            # old path, we haven't found the new name. Therefore,
+            # we mark it as deleted and remove unregister the path.
+            if is_directory:
+                self.queue_event(DirDeletedEvent(src_path))
+            else:
+                self.queue_event(FileDeletedEvent(src_path))
+
+    def _read_events(self, timeout=None):
+        """
+        Reads events from a call to the blocking
+        :meth:`select.kqueue.control()` method.
+
+        :param timeout:
+            Blocking timeout for reading events.
+        :type timeout:
+            ``float`` (seconds)
+        """
+        return self._kq.control(self._descriptors.kevents,
+                                MAX_EVENTS,
+                                timeout)
+
+    def queue_events(self, timeout):
+        """
+        Queues events by reading them from a call to the blocking
+        :meth:`select.kqueue.control()` method.
+
+        :param timeout:
+            Blocking timeout for reading events.
+        :type timeout:
+            ``float`` (seconds)
+        """
+        with self._lock:
+            try:
+                event_list = self._read_events(timeout)
+                files_renamed, dirs_renamed, dirs_modified = (
+                    self._queue_events_except_renames_and_dir_modifications(event_list))
+
+                # Take a fresh snapshot of the directory and update the
+                # saved snapshot.
+                new_snapshot = DirectorySnapshot(self.watch.path,
+                                                 self.watch.is_recursive)
+                ref_snapshot = self._snapshot
+                self._snapshot = new_snapshot
+
+                if files_renamed or dirs_renamed or dirs_modified:
+                    for src_path in files_renamed:
+                        self._queue_renamed(src_path,
+                                            False,
+                                            ref_snapshot,
+                                            new_snapshot)
+                    for src_path in dirs_renamed:
+                        self._queue_renamed(src_path,
+                                            True,
+                                            ref_snapshot,
+                                            new_snapshot)
+                    self._queue_dirs_modified(dirs_modified,
+                                              ref_snapshot,
+                                              new_snapshot)
+            except OSError as e:
+                if e.errno == errno.EBADF:
+                    # logging.debug(e)
+                    pass
+                else:
+                    raise
+
+    def on_thread_stop(self):
+        # Clean up.
+        with self._lock:
+            self._descriptors.clear()
+            self._kq.close()
+
+
+class KqueueObserver(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=KqueueEmitter, timeout=timeout)

flask/venv/lib/python3.6/site-packages/watchdog/observers/polling.py

@@ -0,0 +1,145 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2011 Yesudeep Mangalapilly <yesudeep@gmail.com>
+# Copyright 2012 Google, Inc.
+#
+# 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.
+
+
+"""
+:module: watchdog.observers.polling
+:synopsis: Polling emitter implementation.
+:author: yesudeep@google.com (Yesudeep Mangalapilly)
+
+Classes
+-------
+.. autoclass:: PollingObserver
+   :members:
+   :show-inheritance:
+
+.. autoclass:: PollingObserverVFS
+   :members:
+   :show-inheritance:
+   :special-members:
+"""
+
+from __future__ import with_statement
+import os
+import threading
+from functools import partial
+from watchdog.utils import stat as default_stat
+from watchdog.utils.dirsnapshot import DirectorySnapshot, DirectorySnapshotDiff
+from watchdog.observers.api import (
+    EventEmitter,
+    BaseObserver,
+    DEFAULT_OBSERVER_TIMEOUT,
+    DEFAULT_EMITTER_TIMEOUT
+)
+
+from watchdog.events import (
+    DirMovedEvent,
+    DirDeletedEvent,
+    DirCreatedEvent,
+    DirModifiedEvent,
+    FileMovedEvent,
+    FileDeletedEvent,
+    FileCreatedEvent,
+    FileModifiedEvent
+)
+
+
+class PollingEmitter(EventEmitter):
+    """
+    Platform-independent emitter that polls a directory to detect file
+    system changes.
+    """
+
+    def __init__(self, event_queue, watch, timeout=DEFAULT_EMITTER_TIMEOUT,
+                 stat=default_stat, listdir=os.listdir):
+        EventEmitter.__init__(self, event_queue, watch, timeout)
+        self._snapshot = None
+        self._lock = threading.Lock()
+        self._take_snapshot = lambda: DirectorySnapshot(
+            self.watch.path, self.watch.is_recursive, stat=stat, listdir=listdir)
+
+    def on_thread_start(self):
+        self._snapshot = self._take_snapshot()
+
+    def queue_events(self, timeout):
+        # We don't want to hit the disk continuously.
+        # timeout behaves like an interval for polling emitters.
+        if self.stopped_event.wait(timeout):
+            return
+
+        with self._lock:
+            if not self.should_keep_running():
+                return
+
+            # Get event diff between fresh snapshot and previous snapshot.
+            # Update snapshot.
+            try:
+                new_snapshot = self._take_snapshot()
+            except OSError:
+                self.queue_event(DirDeletedEvent(self.watch.path))
+                self.stop()
+                return
+
+            events = DirectorySnapshotDiff(self._snapshot, new_snapshot)
+            self._snapshot = new_snapshot
+
+            # Files.
+            for src_path in events.files_deleted:
+                self.queue_event(FileDeletedEvent(src_path))
+            for src_path in events.files_modified:
+                self.queue_event(FileModifiedEvent(src_path))
+            for src_path in events.files_created:
+                self.queue_event(FileCreatedEvent(src_path))
+            for src_path, dest_path in events.files_moved:
+                self.queue_event(FileMovedEvent(src_path, dest_path))
+
+            # Directories.
+            for src_path in events.dirs_deleted:
+                self.queue_event(DirDeletedEvent(src_path))
+            for src_path in events.dirs_modified:
+                self.queue_event(DirModifiedEvent(src_path))
+            for src_path in events.dirs_created:
+                self.queue_event(DirCreatedEvent(src_path))
+            for src_path, dest_path in events.dirs_moved:
+                self.queue_event(DirMovedEvent(src_path, dest_path))
+
+
+class PollingObserver(BaseObserver):
+    """
+    Platform-independent observer that polls a directory to detect file
+    system changes.
+    """
+
+    def __init__(self, timeout=DEFAULT_OBSERVER_TIMEOUT):
+        BaseObserver.__init__(self, emitter_class=PollingEmitter, timeout=timeout)
+
+
+class PollingObserverVFS(BaseObserver):
+    """
+    File system independent observer that polls a directory to detect changes.
+    """
+
+    def __init__(self, stat, listdir, polling_interval=1):
+        """
+        :param stat: stat function. See ``os.stat`` for details.
+        :param listdir: listdir function. See ``os.listdir`` for details.
+        :type polling_interval: float
+        :param polling_interval: interval in seconds between polling the file system.
+        """
+        emitter_cls = partial(PollingEmitter, stat=stat, listdir=listdir)
+        BaseObserver.__init__(self, emitter_class=emitter_cls, timeout=polling_interval)

flask/venv/lib/python3.6/site-packages/watchdog/observers/read_directory_changes.py

@@ -0,0 +1,133 @@
+#!/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 threading
+import os.path
+import time
+
+from watchdog.events import (
+    DirCreatedEvent,
+    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)

flask/venv/lib/python3.6/site-packages/watchdog/observers/winapi.py

@@ -0,0 +1,348 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# winapi.py: Windows API-Python interface (removes dependency on pywin32)
+#
+# Copyright (C) 2007 Thomas Heller <theller@ctypes.org>
+# Copyright (C) 2010 Will McGugan <will@willmcgugan.com>
+# Copyright (C) 2010 Ryan Kelly <ryan@rfk.id.au>
+# Copyright (C) 2010 Yesudeep Mangalapilly <yesudeep@gmail.com>
+# Copyright (C) 2014 Thomas Amland
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# * Redistributions of source code must retain the above copyright notice, this
+#   list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above copyright notice,
+#   this list of conditions and the following disclaimer in the documentation
+#   and / or other materials provided with the distribution.
+# * Neither the name of the organization nor the names of its contributors may
+#   be used to endorse or promote products derived from this software without
+#   specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+# Portions of this code were taken from pyfilesystem, which uses the above
+# new BSD license.
+
+from __future__ import with_statement
+
+import ctypes.wintypes
+from functools import reduce
+
+try:
+    LPVOID = ctypes.wintypes.LPVOID
+except AttributeError:
+    # LPVOID wasn't defined in Py2.5, guess it was introduced in Py2.6
+    LPVOID = ctypes.c_void_p
+
+# Invalid handle value.
+INVALID_HANDLE_VALUE = ctypes.c_void_p(-1).value
+
+# File notification contants.
+FILE_NOTIFY_CHANGE_FILE_NAME = 0x01
+FILE_NOTIFY_CHANGE_DIR_NAME = 0x02
+FILE_NOTIFY_CHANGE_ATTRIBUTES = 0x04
+FILE_NOTIFY_CHANGE_SIZE = 0x08
+FILE_NOTIFY_CHANGE_LAST_WRITE = 0x010
+FILE_NOTIFY_CHANGE_LAST_ACCESS = 0x020
+FILE_NOTIFY_CHANGE_CREATION = 0x040
+FILE_NOTIFY_CHANGE_SECURITY = 0x0100
+
+FILE_FLAG_BACKUP_SEMANTICS = 0x02000000
+FILE_FLAG_OVERLAPPED = 0x40000000
+FILE_LIST_DIRECTORY = 1
+FILE_SHARE_READ = 0x01
+FILE_SHARE_WRITE = 0x02
+FILE_SHARE_DELETE = 0x04
+OPEN_EXISTING = 3
+
+# File action constants.
+FILE_ACTION_CREATED = 1
+FILE_ACTION_DELETED = 2
+FILE_ACTION_MODIFIED = 3
+FILE_ACTION_RENAMED_OLD_NAME = 4
+FILE_ACTION_RENAMED_NEW_NAME = 5
+FILE_ACTION_OVERFLOW = 0xFFFF
+
+# Aliases
+FILE_ACTION_ADDED = FILE_ACTION_CREATED
+FILE_ACTION_REMOVED = FILE_ACTION_DELETED
+
+THREAD_TERMINATE = 0x0001
+
+# IO waiting constants.
+WAIT_ABANDONED = 0x00000080
+WAIT_IO_COMPLETION = 0x000000C0
+WAIT_OBJECT_0 = 0x00000000
+WAIT_TIMEOUT = 0x00000102
+
+# Error codes
+ERROR_OPERATION_ABORTED = 995
+
+
+class OVERLAPPED(ctypes.Structure):
+    _fields_ = [('Internal', LPVOID),
+                ('InternalHigh', LPVOID),
+                ('Offset', ctypes.wintypes.DWORD),
+                ('OffsetHigh', ctypes.wintypes.DWORD),
+                ('Pointer', LPVOID),
+                ('hEvent', ctypes.wintypes.HANDLE),
+                ]
+
+
+def _errcheck_bool(value, func, args):
+    if not value:
+        raise ctypes.WinError()
+    return args
+
+
+def _errcheck_handle(value, func, args):
+    if not value:
+        raise ctypes.WinError()
+    if value == INVALID_HANDLE_VALUE:
+        raise ctypes.WinError()
+    return args
+
+
+def _errcheck_dword(value, func, args):
+    if value == 0xFFFFFFFF:
+        raise ctypes.WinError()
+    return args
+
+
+ReadDirectoryChangesW = ctypes.windll.kernel32.ReadDirectoryChangesW
+ReadDirectoryChangesW.restype = ctypes.wintypes.BOOL
+ReadDirectoryChangesW.errcheck = _errcheck_bool
+ReadDirectoryChangesW.argtypes = (
+    ctypes.wintypes.HANDLE,  # hDirectory
+    LPVOID,  # lpBuffer
+    ctypes.wintypes.DWORD,  # nBufferLength
+    ctypes.wintypes.BOOL,  # bWatchSubtree
+    ctypes.wintypes.DWORD,  # dwNotifyFilter
+    ctypes.POINTER(ctypes.wintypes.DWORD),  # lpBytesReturned
+    ctypes.POINTER(OVERLAPPED),  # lpOverlapped
+    LPVOID  # FileIOCompletionRoutine # lpCompletionRoutine
+)
+
+CreateFileW = ctypes.windll.kernel32.CreateFileW
+CreateFileW.restype = ctypes.wintypes.HANDLE
+CreateFileW.errcheck = _errcheck_handle
+CreateFileW.argtypes = (
+    ctypes.wintypes.LPCWSTR,  # lpFileName
+    ctypes.wintypes.DWORD,  # dwDesiredAccess
+    ctypes.wintypes.DWORD,  # dwShareMode
+    LPVOID,  # lpSecurityAttributes
+    ctypes.wintypes.DWORD,  # dwCreationDisposition
+    ctypes.wintypes.DWORD,  # dwFlagsAndAttributes
+    ctypes.wintypes.HANDLE  # hTemplateFile
+)
+
+CloseHandle = ctypes.windll.kernel32.CloseHandle
+CloseHandle.restype = ctypes.wintypes.BOOL
+CloseHandle.argtypes = (
+    ctypes.wintypes.HANDLE,  # hObject
+)
+
+CancelIoEx = ctypes.windll.kernel32.CancelIoEx
+CancelIoEx.restype = ctypes.wintypes.BOOL
+CancelIoEx.errcheck = _errcheck_bool
+CancelIoEx.argtypes = (
+    ctypes.wintypes.HANDLE,  # hObject
+    ctypes.POINTER(OVERLAPPED)  # lpOverlapped
+)
+
+CreateEvent = ctypes.windll.kernel32.CreateEventW
+CreateEvent.restype = ctypes.wintypes.HANDLE
+CreateEvent.errcheck = _errcheck_handle
+CreateEvent.argtypes = (
+    LPVOID,  # lpEventAttributes
+    ctypes.wintypes.BOOL,  # bManualReset
+    ctypes.wintypes.BOOL,  # bInitialState
+    ctypes.wintypes.LPCWSTR,  # lpName
+)
+
+SetEvent = ctypes.windll.kernel32.SetEvent
+SetEvent.restype = ctypes.wintypes.BOOL
+SetEvent.errcheck = _errcheck_bool
+SetEvent.argtypes = (
+    ctypes.wintypes.HANDLE,  # hEvent
+)
+
+WaitForSingleObjectEx = ctypes.windll.kernel32.WaitForSingleObjectEx
+WaitForSingleObjectEx.restype = ctypes.wintypes.DWORD
+WaitForSingleObjectEx.errcheck = _errcheck_dword
+WaitForSingleObjectEx.argtypes = (
+    ctypes.wintypes.HANDLE,  # hObject
+    ctypes.wintypes.DWORD,  # dwMilliseconds
+    ctypes.wintypes.BOOL,  # bAlertable
+)
+
+CreateIoCompletionPort = ctypes.windll.kernel32.CreateIoCompletionPort
+CreateIoCompletionPort.restype = ctypes.wintypes.HANDLE
+CreateIoCompletionPort.errcheck = _errcheck_handle
+CreateIoCompletionPort.argtypes = (
+    ctypes.wintypes.HANDLE,  # FileHandle
+    ctypes.wintypes.HANDLE,  # ExistingCompletionPort
+    LPVOID,  # CompletionKey
+    ctypes.wintypes.DWORD,  # NumberOfConcurrentThreads
+)
+
+GetQueuedCompletionStatus = ctypes.windll.kernel32.GetQueuedCompletionStatus
+GetQueuedCompletionStatus.restype = ctypes.wintypes.BOOL
+GetQueuedCompletionStatus.errcheck = _errcheck_bool
+GetQueuedCompletionStatus.argtypes = (
+    ctypes.wintypes.HANDLE,  # CompletionPort
+    LPVOID,  # lpNumberOfBytesTransferred
+    LPVOID,  # lpCompletionKey
+    ctypes.POINTER(OVERLAPPED),  # lpOverlapped
+    ctypes.wintypes.DWORD,  # dwMilliseconds
+)
+
+PostQueuedCompletionStatus = ctypes.windll.kernel32.PostQueuedCompletionStatus
+PostQueuedCompletionStatus.restype = ctypes.wintypes.BOOL
+PostQueuedCompletionStatus.errcheck = _errcheck_bool
+PostQueuedCompletionStatus.argtypes = (
+    ctypes.wintypes.HANDLE,  # CompletionPort
+    ctypes.wintypes.DWORD,  # lpNumberOfBytesTransferred
+    ctypes.wintypes.DWORD,  # lpCompletionKey
+    ctypes.POINTER(OVERLAPPED),  # lpOverlapped
+)
+
+
+class FILE_NOTIFY_INFORMATION(ctypes.Structure):
+    _fields_ = [("NextEntryOffset", ctypes.wintypes.DWORD),
+                ("Action", ctypes.wintypes.DWORD),
+                ("FileNameLength", ctypes.wintypes.DWORD),
+                #("FileName", (ctypes.wintypes.WCHAR * 1))]
+                ("FileName", (ctypes.c_char * 1))]
+
+LPFNI = ctypes.POINTER(FILE_NOTIFY_INFORMATION)
+
+
+# We don't need to recalculate these flags every time a call is made to
+# the win32 API functions.
+WATCHDOG_FILE_FLAGS = FILE_FLAG_BACKUP_SEMANTICS
+WATCHDOG_FILE_SHARE_FLAGS = reduce(
+    lambda x, y: x | y, [
+        FILE_SHARE_READ,
+        FILE_SHARE_WRITE,
+        FILE_SHARE_DELETE,
+    ])
+WATCHDOG_FILE_NOTIFY_FLAGS = reduce(
+    lambda x, y: x | y, [
+        FILE_NOTIFY_CHANGE_FILE_NAME,
+        FILE_NOTIFY_CHANGE_DIR_NAME,
+        FILE_NOTIFY_CHANGE_ATTRIBUTES,
+        FILE_NOTIFY_CHANGE_SIZE,
+        FILE_NOTIFY_CHANGE_LAST_WRITE,
+        FILE_NOTIFY_CHANGE_SECURITY,
+        FILE_NOTIFY_CHANGE_LAST_ACCESS,
+        FILE_NOTIFY_CHANGE_CREATION,
+    ])
+
+BUFFER_SIZE = 2048
+
+    
+def _parse_event_buffer(readBuffer, nBytes):
+    results = []
+    while nBytes > 0:
+        fni = ctypes.cast(readBuffer, LPFNI)[0]
+        ptr = ctypes.addressof(fni) + FILE_NOTIFY_INFORMATION.FileName.offset
+        #filename = ctypes.wstring_at(ptr, fni.FileNameLength)
+        filename = ctypes.string_at(ptr, fni.FileNameLength)
+        results.append((fni.Action, filename.decode('utf-16')))
+        numToSkip = fni.NextEntryOffset
+        if numToSkip <= 0:
+            break
+        readBuffer = readBuffer[numToSkip:]
+        nBytes -= numToSkip  # numToSkip is long. nBytes should be long too.
+    return results
+
+
+def get_directory_handle(path):
+    """Returns a Windows handle to the specified directory path."""
+    return CreateFileW(path, FILE_LIST_DIRECTORY, WATCHDOG_FILE_SHARE_FLAGS,
+                       None, OPEN_EXISTING, WATCHDOG_FILE_FLAGS, None)
+
+
+def close_directory_handle(handle):
+    try:
+        CancelIoEx(handle, None)  # force ReadDirectoryChangesW to return
+        CloseHandle(handle)       # close directory handle
+    except WindowsError:
+        try:
+            CloseHandle(handle)   # close directory handle
+        except:
+            return
+
+
+def read_directory_changes(handle, recursive):
+    """Read changes to the directory using the specified directory handle.
+
+    http://timgolden.me.uk/pywin32-docs/win32file__ReadDirectoryChangesW_meth.html
+    """
+    event_buffer = ctypes.create_string_buffer(BUFFER_SIZE)
+    nbytes = ctypes.wintypes.DWORD()
+    try:
+        ReadDirectoryChangesW(handle, ctypes.byref(event_buffer),
+                              len(event_buffer), recursive,
+                              WATCHDOG_FILE_NOTIFY_FLAGS,
+                              ctypes.byref(nbytes), None, None)
+    except WindowsError as e:
+        if e.winerror == ERROR_OPERATION_ABORTED:
+            return [], 0
+        raise e
+
+    # Python 2/3 compat
+    try:
+        int_class = long
+    except NameError:
+        int_class = int
+    return event_buffer.raw, int_class(nbytes.value)
+
+
+class WinAPINativeEvent(object):
+    def __init__(self, action, src_path):
+        self.action = action
+        self.src_path = src_path
+    
+    @property
+    def is_added(self):
+        return self.action == FILE_ACTION_CREATED
+    
+    @property
+    def is_removed(self):
+        return self.action == FILE_ACTION_REMOVED
+    
+    @property
+    def is_modified(self):
+        return self.action == FILE_ACTION_MODIFIED
+    
+    @property
+    def is_renamed_old(self):
+        return self.action == FILE_ACTION_RENAMED_OLD_NAME
+    
+    @property
+    def is_renamed_new(self):
+        return self.action == FILE_ACTION_RENAMED_NEW_NAME
+    
+    def __repr__(self):
+        return ("<WinAPINativeEvent: action=%d, src_path=%r>" % (self.action, self.src_path))
+
+
+def read_events(handle, recursive):
+    buf, nbytes = read_directory_changes(handle, recursive)
+    events = _parse_event_buffer(buf, nbytes)
+    return [WinAPINativeEvent(action, path) for action, path in events]