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