130 lines
3.4 KiB
Python
130 lines
3.4 KiB
Python
# -*- Mode: Python; test-case-name: morituri.test.test_common_common -*-
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# vi:si:et:sw=4:sts=4:ts=4
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# Morituri - for those about to RIP
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# Copyright (C) 2009 Thomas Vander Stichele
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# This file is part of morituri.
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#
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# morituri is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# morituri is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with morituri. If not, see <http://www.gnu.org/licenses/>.
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import os
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import tempfile
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import shutil
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def msfToFrames(msf):
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"""
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Converts a string value in MM:SS:FF to frames
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@param msf:
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@type msf: str
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@rtype int
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@returns number of frames
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"""
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if not ':' in msf:
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return int(msf)
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m, s, f = msf.split(':')
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return 60 * 75 * int(m) + 75 * int(s) + int(f)
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def framesToMSF(frames):
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f = frames % 75
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frames -= f
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s = (frames / 75) % 60
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frames -= s * 60
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m = frames / 75 / 60
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return "%02d:%02d:%02d" % (m, s, f)
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def framesToHMSF(frames):
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# cdparanoia style
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f = frames % 75
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frames -= f
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s = (frames / 75) % 60
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frames -= s * 75
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m = (frames / 75 / 60) % 60
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frames -= m * 75 * 60
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h = frames / 75 / 60 / 60
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return "%02d:%02d:%02d.%02d" % (h, m, s, f)
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class Persister(object):
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"""
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I wrap an optional pickle to persist an object to disk.
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Instantiate me with a path to automatically unpickle the object.
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Call persist to store the object to disk; it will get stored if it
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changed from the on-disk object.
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@ivar object: the persistent object
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"""
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def __init__(self, path=None, default=None):
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"""
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If path is not given, the object will not be persisted.
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This allows code to transparently deal with both persisted and
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non-persisted objects, since the persist method will just end up
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doing nothing.
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"""
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self._path = path
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self.object = None
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self._unpickle(default)
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def persist(self, object=None):
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"""
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Persist the given object, if we have a persistence path and the
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object changed.
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If object is not given, re-persist our object, always.
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If object is given, only persist if it was changed.
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"""
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# don't pickle if it's already ok
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if object and object == self.object:
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return
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# don't pickle if there is no path
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if not self._path:
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return
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# default to pickling our object again
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if object is None:
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object = self.object
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# pickle
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self.object = object
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(fd, path) = tempfile.mkstemp(suffix='.morituri.pickle')
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handle = os.fdopen(fd, 'wb')
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import pickle
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pickle.dump(object, handle, 2)
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handle.close()
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# do an atomic move
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shutil.move(path, self._path)
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def _unpickle(self, default=None):
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self.object = default
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if not self._path:
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return None
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if not os.path.exists(self._path):
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return None
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handle = open(self._path)
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import pickle
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self.object = pickle.load(handle)
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