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# -*- coding: utf-8 -*- |
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# ----------------------------------------------------------------------------- |
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# Copyright (c) 2015 Yann Lanthony |
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# Copyright (c) 2017-2018 Spyder Project Contributors |
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# |
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# Licensed under the terms of the MIT License |
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# (See LICENSE.txt for details) |
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# ----------------------------------------------------------------------------- |
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"""Contains the fallback implementation of the Watcher api.""" |
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# yapf: disable |
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from __future__ import absolute_import, print_function |
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# Standard library imports |
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import atexit |
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import os |
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import time |
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import threading |
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# Local imports |
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from qtsass.watchers.api import Watcher |
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from qtsass.importers import norm_path |
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class PollingThread(threading.Thread): |
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"""A daemon thread that continually fires a callback at the specified |
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interval.""" |
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def __init__(self, callback, interval): |
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super(PollingThread, self).__init__() |
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self.daemon = True |
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self.callback = callback |
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self.interval = interval |
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self._shutdown = threading.Event() |
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self._stopped = threading.Event() |
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self._started = threading.Event() |
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atexit.register(self.stop) |
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@property |
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def started(self): |
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return self._started.is_set() |
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@property |
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def stopped(self): |
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return self._stopped.is_set() |
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@property |
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def shutdown(self): |
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return self._shutdown.is_set() |
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def stop(self): |
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if not self.started and not self.shutdown: |
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return |
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self._shutdown.set() |
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self._stopped.wait() |
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def run(self): |
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try: |
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self._started.set() |
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while True: |
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self.callback() |
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if self._shutdown.wait(self.interval): |
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break |
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finally: |
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self._stopped.set() |
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class PollingWatcher(Watcher): |
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"""Polls a directory recursively for changes. |
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Detects file and directory changes, deletions, and creations. Recursion |
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depth is limited to 2 levels. We use a limit because the scss file we're |
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watching for changes could be sitting in the root of a project rather than |
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a dedicated scss directory. That could lead to snapshots taking too long |
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to build and diff. It's probably safe to assume that users aren't nesting |
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scss deeper than a couple of levels. |
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""" |
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def setup(self): |
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self._snapshot_depth = 2 |
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self._snapshot = self._take_snapshot() |
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self._callbacks = set() |
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self._stop = False |
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self._thread = PollingThread(self._check_snapshot, interval=1) |
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def connect(self, fn): |
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self._callbacks.add(fn) |
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def disconnect(self, fn): |
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self._callbacks.discard(fn) |
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def start(self): |
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self._thread.start() |
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def stop(self): |
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self._thread.stop() |
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def join(self): |
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self._thread.join() |
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def _take_snapshot(self): |
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snapshot = {} |
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base_depth = len(norm_path(self._watch_dir).split('/')) |
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for root, subdirs, files in os.walk(self._watch_dir): |
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path = norm_path(root) |
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if len(path.split('/')) - base_depth == self._snapshot_depth: |
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subdirs[:] = [] |
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snapshot[path] = os.path.getmtime(path) |
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for f in files: |
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path = norm_path(root, f) |
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snapshot[path] = os.path.getmtime(path) |
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return snapshot |
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def _diff_snapshots(self, prev_snapshot, next_snapshot): |
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changes = {} |
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for path in set(prev_snapshot.keys()) | set(next_snapshot.keys()): |
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if path in prev_snapshot and path not in next_snapshot: |
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changes[path] = 'Deleted' |
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elif path not in prev_snapshot and path in next_snapshot: |
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changes[path] = 'Created' |
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else: |
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prev_mtime = prev_snapshot[path] |
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next_mtime = next_snapshot[path] |
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if next_mtime > prev_mtime: |
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changes[path] = 'Changed' |
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return changes |
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def _check_snapshot(self): |
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next_snapshot = self._take_snapshot() |
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changes = self._diff_snapshots(self._snapshot, next_snapshot) |
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if changes: |
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self._snapshot = next_snapshot |
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self._dispatch() |
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def _dispatch(self): |
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css = self.compile() |
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for callback in self._callbacks: |
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callback(css) |
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spyder-ide /
qtsass
