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# vim: set fileencoding=utf-8 :
#
# (C) 2017 Guido Günther <agx@sigxcpu.org>
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, please see
# <http://www.gnu.org/licenses/>
class Compressor(object):
# Map frequently used names of compression types to the internal ones:
Aliases = {'bz2': 'bzip2',
'gz': 'gzip', }
Opts = {'gzip': '-n',
'bzip2': '',
'lzma': '',
'xz': ''}
Exts = {'gzip': 'gz',
'bzip2': 'bz2',
'lzma': 'lzma',
'xz': 'xz'}
def __init__(self, type_, level=None):
self._type = type_
self._level = int(level) if level not in [None, ''] else None
def is_known(self):
return self.type in self.Opts.keys()
@property
def type(self):
return self._type
@property
def level(self):
return self._level
@property
def _level_opt(self):
return '-%d' % self.level if self.level is not None else ''
@property
def _more_opts(self):
return self.Opts.get(self._type, '')
def cmdline(self, stdout=True):
"""
>>> Compressor('gzip', level=9).cmdline()
'gzip -9 -n -c'
>>> Compressor('gzip').cmdline(True)
'gzip -n -c'
"""
return "%s %s %s %s" % (self.type, self._level_opt, self._more_opts,
"-c" if stdout else '')
def __repr__(self):
"""
>>> Compressor('gzip').__repr__()
"<compressor type='gzip' >"
>>> Compressor('gzip', 9).__repr__()
"<compressor type='gzip' level=9>"
"""
level_str = "level=%s" % self.level if self.level is not None else ''
return "<compressor type='%s' %s>" % (self.type, level_str)
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