# -*- coding: UTF-8 -*-
# Copyright © 2010-2012 Piotr Ożarowski <[email protected]>
#
# 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.

import logging
from os import walk
from os.path import abspath, isfile, join
from subprocess import Popen, PIPE

log = logging.getLogger(__name__)


def from_directory(dname, extensions=('.py',)):
"""Generate *.py file names available in given directory."""
extensions = tuple(extensions) # .endswith doesn't like list
if isinstance(dname, (list, tuple)):
for item in dname:
for fn in from_directory(item):
yield fn
elif isfile(dname) and dname.endswith(extensions):
yield dname
else:
for root, dirs, file_names in walk(abspath(dname)):
for fn in file_names:
if fn.endswith(extensions):
yield join(root, fn)


def from_package(package_name, extensions=('.py',)):
"""Generate *.py file names available in given package."""
extensions = tuple(extensions) # .endswith doesn't like list
process = Popen("/usr/bin/dpkg -L %s" % package_name,\
shell=True, stdout=PIPE)
stdout, stderr = process.communicate()
if process.returncode != 0:
raise Exception("cannot get content of %s" % package_name)
for line in stdout.splitlines():
if line.endswith(extensions):
yield line


def filter_directory(files, dname):
"""Generate *.py file names that match given directory."""
for fn in files:
if fn.startswith(dname):
yield fn


def filter_public(files, versions):
"""Generate *.py file names that match given versions."""
versions_str = set("%d.%d" % i for i in versions)
for fn in files:
if fn.startswith('/usr/lib/python') and \
fn[15:18] in versions_str:
yield fn


def filter_out_ext(files, extensions):
"""Removes files with matching extensions from given generator."""
for fn in files:
if not fn.endswith(extensions):
yield fn