mirror of
https://github.com/kovidgoyal/calibre.git
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66 lines
2.4 KiB
Python
66 lines
2.4 KiB
Python
## Copyright (C) 2006 Kovid Goyal kovid@kovidgoyal.net
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## This program 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 2 of the License, or
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## (at your option) any later version.
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##
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## This program 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 along
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## with this program; if not, write to the Free Software Foundation, Inc.,
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.Warning
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"""
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Provides platform independent temporary files that persist even after
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being closed.
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"""
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import tempfile
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import os
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from libprs500 import __version__, __appname__
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class _TemporaryFileWrapper(object):
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"""
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Temporary file wrapper
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This class provides a wrapper around files opened for
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temporary use. In particular, it seeks to automatically
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remove the file when the object is deleted.
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"""
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def __init__(self, _file, name):
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self.file = _file
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self.name = name
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def __getattr__(self, name):
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_file = self.__dict__['file']
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a = getattr(_file, name)
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if type(a) != type(0):
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setattr(self, name, a)
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return a
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def __del__(self):
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try:
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import os # Needs to be here as the main os may no longer exist
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self.close()
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if self.name and os.access(self.name, os.F_OK):
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os.remove(self.name)
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except: # An error just means that deleting of temporary file failed
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pass
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def PersistentTemporaryFile(suffix="", prefix="", dir=None):
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"""
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Return a temporary file that is available even after being closed on
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all platforms. It is automatically deleted when this object is deleted.
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Uses tempfile.mkstemp to create the file. The file is opened in mode 'wb'.
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"""
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if prefix == None:
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prefix = ""
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fd, name = tempfile.mkstemp(suffix, __appname__+"_"+ __version__+"_" + prefix,
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dir=dir)
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_file = os.fdopen(fd, 'w+b')
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return _TemporaryFileWrapper(_file, name)
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