| """Helper to watch a (set) of directories for modifications.""" |
| |
| import os |
| import time |
| |
| |
| class DirWatcher(object): |
| """Helper to watch a (set) of directories for modifications.""" |
| |
| def __init__(self, paths): |
| if isinstance(paths, basestring): |
| paths = [paths] |
| self._done = False |
| self.paths = list(paths) |
| self.lastrun = time.time() |
| self._cache = self._calculate() |
| |
| def _calculate(self): |
| """Walk over all subscribed paths, check most recent mtime.""" |
| most_recent_change = None |
| for path in self.paths: |
| if not os.path.exists(path): |
| continue |
| if not os.path.isdir(path): |
| continue |
| for root, _, files in os.walk(path): |
| for f in files: |
| if f and f[0] == '.': continue |
| try: |
| st = os.stat(os.path.join(root, f)) |
| except OSError as e: |
| if e.errno == os.errno.ENOENT: |
| continue |
| raise |
| if most_recent_change is None: |
| most_recent_change = st.st_mtime |
| else: |
| most_recent_change = max(most_recent_change, st.st_mtime) |
| return most_recent_change |
| |
| def most_recent_change(self): |
| if time.time() - self.lastrun > 1: |
| self._cache = self._calculate() |
| self.lastrun = time.time() |
| return self._cache |
| |