[Linuxtrent] Re: esperti di shell...domandina!
- From: Roberto Cavada <cavada@xxxxxx>
- To: "linuxtrent@xxxxxxxxxxxxx" <linuxtrent@xxxxxxxxxxxxx>
- Date: Wed, 25 Mar 2009 10:09:19 +0100
Lele Gaifax wrote:
from os.path import join, dirname, normpath
(...)
Aah, la ruota ovale.
from os.path import relpath
(solo in 2.6)
Altrimenti e' piu' lungo (preso da 2.6 e adattato un pelo):
import os
import os.path
relpath = None
# ----------------------------------------------------------------------
def __posix_relpath(path, start=os.curdir):
"""Return a relative version of a path"""
if not path: raise ValueError("no path specified")
start_list = os.path.abspath(start).split(os.sep)
path_list = os.path.abspath(path).split(os.sep)
# Work out how much of the filepath is shared by start and path.
i = len(os.path.commonprefix([start_list, path_list]))
rel_list = [os.pardir] * (len(start_list)-i) + path_list[i:]
if not rel_list: return os.curdir
return os.path.join(*rel_list)
def __nt_relpath(path, start=os.curdir):
"""Return a relative version of a path"""
if not path: raise ValueError("no path specified")
start_list = os.path.abspath(start).split(os.sep)
path_list = os.path.abspath(path).split(os.sep)
if start_list[0].lower() != path_list[0].lower():
unc_path, rest = os.path.splitunc(path)
unc_start, rest = os.path.splitunc(start)
if bool(unc_path) ^ bool(unc_start):
raise ValueError("Cannot mix UNC and non-UNC paths (%s
and %s)" % (path, start))
else: raise ValueError("path is on drive %s, start on drive
%s" % (path_list[0], start_list[0]))
# Work out how much of the filepath is shared by start and path.
for i in range(min(len(start_list), len(path_list))):
if start_list[i].lower() != path_list[i].lower():
break
else: i += 1
rel_list = [os.pardir] * (len(start_list)-i) + path_list[i:]
if not rel_list: return os.curdir
return os.path.join(*rel_list)
try:
import os.path.relpath
relpath = os.path.relpath
except ImportError: relpath = __nt_relpath if os.name == 'nt' else
__posix_relpath
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