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- # -*- coding: UTF-8 -*-
- # Copyright © 2010 Piotr Ożarowski <piotr@debian.org>
- #
- # Permission is hereby granted, free of charge, to any person obtaining a copy
- # of this software and associated documentation files (the "Software"), to deal
- # in the Software without restriction, including without limitation the rights
- # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- # copies of the Software, and to permit persons to whom the Software is
- # furnished to do so, subject to the following conditions:
- #
- # The above copyright notice and this permission notice shall be included in
- # all copies or substantial portions of the Software.
- #
- # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- # THE SOFTWARE.
-
- from __future__ import with_statement
- import logging
- import re
- from cPickle import dumps
- from os import symlink
- from debpython.version import getver
-
- log = logging.getLogger(__name__)
- EGGnPTH_RE = re.compile(r'(.*?)(-py\d\.\d(?:-[^.]*)?)?(\.egg-info|\.pth)$')
- SHEBANG_RE = re.compile(r'^#!\s*/usr/bin/(?:env\s+)?(python(\d+\.\d+)?(?:-dbg)?).*')
-
-
- def sitedir(version, package=None, gdb=False):
- """Return path to site-packages directory.
-
- >>> sitedir((2, 5))
- '/usr/lib/python2.5/site-packages/'
- >>> sitedir((2, 7), 'python-foo', True)
- 'debian/python-foo/usr/lib/debug/usr/lib/python2.7/dist-packages/'
- """
- if isinstance(version, basestring):
- version = tuple(int(i) for i in version.split('.'))
-
- if version >= (2, 6):
- path = "/usr/lib/python%d.%d/dist-packages/" % version
- else:
- path = "/usr/lib/python%d.%d/site-packages/" % version
-
- if gdb:
- path = "/usr/lib/debug%s" % path
- if package:
- path = "debian/%s%s" % (package, path)
-
- return path
-
-
- def relpath(target, link):
- """Return relative path.
-
- >>> relpath('/usr/share/python-foo/foo.py', '/usr/bin/foo', )
- '../share/python-foo/foo.py'
- """
- t = target.split('/')
- l = link.split('/')
- while l[0] == t[0]:
- del l[0], t[0]
- return '/'.join(['..'] * (len(l) - 1) + t)
-
-
- def relative_symlink(target, link):
- """Create relative symlink."""
- return symlink(relpath(target, link), link)
-
-
- def shebang2pyver(fname):
- """Check file's shebang.
-
- :rtype: tuple
- :returns: pair of Python interpreter string and Python version
- """
- try:
- with open(fname) as fp:
- data = fp.read(32)
- match = SHEBANG_RE.match(data)
- if not match:
- return None
- res = match.groups()
- if res != (None, None):
- if res[1]:
- res = res[0], getver(res[1])
- return res
- except IOError:
- log.error('cannot open %s', fname)
-
-
- def clean_egg_name(name):
- """Remove Python version and platform name from Egg files/dirs.
-
- >>> clean_egg_name('python_pipeline-0.1.3_py3k-py3.1.egg-info')
- 'python_pipeline-0.1.3_py3k.egg-info'
- >>> clean_egg_name('Foo-1.2-py2.7-linux-x86_64.egg-info')
- 'Foo-1.2.egg-info'
- """
- match = EGGnPTH_RE.match(name)
- if match and match.group(2) is not None:
- return ''.join(match.group(1, 3))
- return name
-
-
- class memoize(object):
- def __init__(self, func):
- self.func = func
- self.cache = {}
-
- def __call__(self, *args, **kwargs):
- key = dumps((args, kwargs))
- if key not in self.cache:
- self.cache[key] = self.func(*args, **kwargs)
- return self.cache[key]
-