/usr/lib/python2.7/dist-packages/livereload/watcher.py is in python-livereload 2.5.1-1.
This file is owned by root:root, with mode 0o644.
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"""
livereload.watcher
~~~~~~~~~~~~~~~~~~
A file watch management for LiveReload Server.
:copyright: (c) 2013 - 2015 by Hsiaoming Yang
:license: BSD, see LICENSE for more details.
"""
import os
import glob
import time
try:
import pyinotify
except ImportError:
pyinotify = None
class Watcher(object):
"""A file watcher registery."""
def __init__(self):
self._tasks = {}
self._mtimes = {}
# setting changes
self._changes = []
# filepath that is changed
self.filepath = None
self._start = time.time()
def ignore(self, filename):
"""Ignore a given filename or not."""
_, ext = os.path.splitext(filename)
return ext in ['.pyc', '.pyo', '.o', '.swp']
def watch(self, path, func=None, delay=0, ignore=None):
"""Add a task to watcher.
:param path: a filepath or directory path or glob pattern
:param func: the function to be executed when file changed
:param delay: Delay sending the reload message. Use 'forever' to
not send it. This is useful to compile sass files to
css, but reload on changed css files then only.
:param ignore: A function return True to ignore a certain pattern of
filepath.
"""
self._tasks[path] = {
'func': func,
'delay': delay,
'ignore': ignore,
}
def start(self, callback):
"""Start the watcher running, calling callback when changes are
observed. If this returns False, regular polling will be used."""
return False
def examine(self):
"""Check if there are changes, if true, run the given task."""
if self._changes:
return self._changes.pop()
# clean filepath
self.filepath = None
delays = set()
for path in self._tasks:
item = self._tasks[path]
if self.is_changed(path, item['ignore']):
func = item['func']
func and func()
delay = item['delay']
if delay and isinstance(delay, float):
delays.add(delay)
if delays:
delay = max(delays)
else:
delay = None
return self.filepath, delay
def is_changed(self, path, ignore=None):
if os.path.isfile(path):
return self.is_file_changed(path, ignore)
elif os.path.isdir(path):
return self.is_folder_changed(path, ignore)
return self.is_glob_changed(path, ignore)
def is_file_changed(self, path, ignore=None):
if not os.path.isfile(path):
return False
if self.ignore(path):
return False
if ignore and ignore(path):
return False
mtime = os.path.getmtime(path)
if path not in self._mtimes:
self._mtimes[path] = mtime
self.filepath = path
return mtime > self._start
if self._mtimes[path] != mtime:
self._mtimes[path] = mtime
self.filepath = path
return True
self._mtimes[path] = mtime
return False
def is_folder_changed(self, path, ignore=None):
for root, dirs, files in os.walk(path, followlinks=True):
if '.git' in dirs:
dirs.remove('.git')
if '.hg' in dirs:
dirs.remove('.hg')
if '.svn' in dirs:
dirs.remove('.svn')
if '.cvs' in dirs:
dirs.remove('.cvs')
for f in files:
if self.is_file_changed(os.path.join(root, f), ignore):
return True
return False
def is_glob_changed(self, path, ignore=None):
for f in glob.glob(path):
if self.is_file_changed(f, ignore):
return True
return False
class INotifyWatcher(Watcher):
def __init__(self):
Watcher.__init__(self)
self.wm = pyinotify.WatchManager()
self.notifier = None
self.callback = None
def watch(self, path, func=None, delay=None, ignore=None):
flag = pyinotify.IN_CREATE | pyinotify.IN_DELETE | pyinotify.IN_MODIFY
self.wm.add_watch(path, flag, rec=True, do_glob=True, auto_add=True)
Watcher.watch(self, path, func, delay, ignore)
def inotify_event(self, event):
self.callback()
def start(self, callback):
if not self.notifier:
self.callback = callback
from tornado import ioloop
self.notifier = pyinotify.TornadoAsyncNotifier(
self.wm, ioloop.IOLoop.instance(),
default_proc_fun=self.inotify_event
)
callback()
return True
def get_watcher_class():
if pyinotify is None or not hasattr(pyinotify, 'TornadoAsyncNotifier'):
return Watcher
return INotifyWatcher
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