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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/>
from .compressor import Compressor
class Archive(object):
# Supported archive formats
Formats = ['tar', 'zip']
# Map combined file extensions to archive and compression format
Ext_aliases = {'tgz': ('tar', 'gzip'),
'tbz2': ('tar', 'bzip2'),
'tlz': ('tar', 'lzma'),
'txz': ('tar', 'xz')}
@staticmethod
def parse_filename(filename):
"""
Given an filename return the basename (filename without the
archive and compression extensions), archive format and
compression method used.
@param filename: the name of the file
@type filename: string
@return: tuple containing basename, archive format and compression method
@rtype: C{tuple} of C{str}
>>> Archive.parse_filename("abc.tar.gz")
('abc', 'tar', 'gzip')
>>> Archive.parse_filename("abc.tar.bz2")
('abc', 'tar', 'bzip2')
>>> Archive.parse_filename("abc.def.tbz2")
('abc.def', 'tar', 'bzip2')
>>> Archive.parse_filename("abc.def.tar.xz")
('abc.def', 'tar', 'xz')
>>> Archive.parse_filename("abc.zip")
('abc', 'zip', None)
>>> Archive.parse_filename("abc.lzma")
('abc', None, 'lzma')
>>> Archive.parse_filename("abc.tar.foo")
('abc.tar.foo', None, None)
>>> Archive.parse_filename("abc")
('abc', None, None)
"""
(base_name, archive_fmt, compression) = (filename, None, None)
# Split filename into pieces
split = filename.split(".")
if len(split) > 1:
if split[-1] in Archive.Ext_aliases:
base_name = ".".join(split[:-1])
(archive_fmt, compression) = Archive.Ext_aliases[split[-1]]
elif split[-1] in Archive.Formats:
base_name = ".".join(split[:-1])
(archive_fmt, compression) = (split[-1], None)
else:
for (c, ext) in Compressor.Exts.items():
if ext == split[-1]:
base_name = ".".join(split[:-1])
compression = c
if len(split) > 2 and split[-2] in Archive.Formats:
base_name = ".".join(split[:-2])
archive_fmt = split[-2]
return (base_name, archive_fmt, compression)
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