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# -*- coding: utf-8 -*-
from __future__ import unicode_literals
import os
from django.utils import six
from compressor.exceptions import FilterError
def get_class(class_string, exception=FilterError):
"""
Convert a string version of a function name to the callable object.
"""
if not hasattr(class_string, '__bases__'):
try:
class_string = str(class_string)
mod_name, class_name = get_mod_func(class_string)
if class_name:
return getattr(__import__(mod_name, {}, {}, [str('')]), class_name)
except (ImportError, AttributeError):
raise exception('Failed to import %s' % class_string)
raise exception("Invalid class path '%s'" % class_string)
def get_mod_func(callback):
"""
Converts 'django.views.news.stories.story_detail' to
('django.views.news.stories', 'story_detail')
"""
try:
dot = callback.rindex('.')
except ValueError:
return callback, ''
return callback[:dot], callback[dot + 1:]
def get_pathext(default_pathext=None):
"""
Returns the path extensions from environment or a default
"""
if default_pathext is None:
default_pathext = os.pathsep.join(['.COM', '.EXE', '.BAT', '.CMD'])
return os.environ.get('PATHEXT', default_pathext)
def find_command(cmd, paths=None, pathext=None):
"""
Searches the PATH for the given command and returns its path
"""
if paths is None:
paths = os.environ.get('PATH', '').split(os.pathsep)
if isinstance(paths, six.string_types):
paths = [paths]
# check if there are funny path extensions for executables, e.g. Windows
if pathext is None:
pathext = get_pathext()
pathext = [ext for ext in pathext.lower().split(os.pathsep)]
# don't use extensions if the command ends with one of them
if os.path.splitext(cmd)[1].lower() in pathext:
pathext = ['']
# check if we find the command on PATH
for path in paths:
# try without extension first
cmd_path = os.path.join(path, cmd)
for ext in pathext:
# then including the extension
cmd_path_ext = cmd_path + ext
if os.path.isfile(cmd_path_ext):
return cmd_path_ext
if os.path.isfile(cmd_path):
return cmd_path
return None
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