1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
# 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': ''}
ParallelOpts = {'lzma': '-T0',
'xz': '-T0'}
Exts = {'gzip': 'gz',
'bzip2': 'bz2',
'lzma': 'lzma',
'xz': 'xz'}
def __init__(self, type_, level=None, parallel=False):
self._type = type_
self._level = int(level) if level not in [None, ''] else None
self._more_opts = self.Opts.get(self._type, '')
self._parallel = parallel
if parallel:
self._more_opts += self.ParallelOpts.get(self._type, '')
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 parallel(self):
return self._parallel
@property
def _level_opt(self):
return '-%d' % self.level if self.level is not None else ''
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>"
>>> Compressor('xz', 9, True).__repr__()
"<compressor type='xz' level=9 parallel=True>"
"""
opts_str = " level=%s" % self.level if self.level is not None else ""
opts_str += " parallel=True" if self.parallel else ""
return "<compressor type='%s'%s>" % (self.type, opts_str)
|