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Patch 1339796: add a relpath() function to os.path.

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This commit is contained in:
Collin Winter 2007-03-16 22:16:08 +00:00
parent 6de691d78c
commit 6f187743ff
7 changed files with 77 additions and 3 deletions
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17
Lib/posixpath.py
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@ -21,7 +21,7 @@ __all__ = ["normcase","isabs","join","splitdrive","split","splitext",
"ismount","walk","expanduser","expandvars","normpath","abspath",
"samefile","sameopenfile","samestat",
"curdir","pardir","sep","pathsep","defpath","altsep","extsep",
"devnull","realpath","supports_unicode_filenames"]
"devnull","realpath","supports_unicode_filenames","relpath"]
# strings representing various path-related bits and pieces
curdir = '.'
@ -382,3 +382,18 @@ def _resolve_link(path):
return path
supports_unicode_filenames = False
def relpath(path, start=curdir):
"""Return a relative version of a path"""
if not path:
raise ValueError("no path specified")
start_list = abspath(start).split(sep)
path_list = abspath(path).split(sep)
# Work out how much of the filepath is shared by start and path.
i = len(commonprefix([start_list, path_list]))
rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
return join(*rel_list)