* Added function relpath() to compute relative path from one to another

path.
master
Wirawan Purwanto 11 years ago
parent fc0d97db1e
commit 2e21e2857a
  1. 32
      shell_tools.py

@ -21,6 +21,9 @@ except:
print >>sys.stderr, "Newer subprocess module does not exist, using older interfaces."
has_subprocess = False
# Files, directories, and filename utilities
def mcd(subdir):
# Assuming we have GNU coreutils' mkdir
mkdir("-p", subdir)
@ -47,6 +50,35 @@ def provide_link(dest, src):
os.symlink(src, dest.rstrip("/"))
# The following 3 routines are from
# http://code.activestate.com/recipes/208993-compute-relative-path-from-one-directory-to-anothe/
# by Cimarron Taylor
# (PSF license)
def _pathsplit(p, rest=[]):
(h,t) = os.path.split(p)
if len(h) < 1: return [t]+rest
if len(t) < 1: return [h]+rest
return _pathsplit(h,[t]+rest)
def _commonpath(l1, l2, common=[]):
if len(l1) < 1: return (common, l1, l2)
if len(l2) < 1: return (common, l1, l2)
if l1[0] != l2[0]: return (common, l1, l2)
return _commonpath(l1[1:], l2[1:], common+[l1[0]])
def relpath(p1, p2):
"""Computes the relative path of p2 with respect to p1."""
(common,l1,l2) = _commonpath(_pathsplit(p1), _pathsplit(p2))
p = []
if len(l1) > 0:
p = [ '../' * len(l1) ]
p = p + l2
return os.path.join( *p )
# /// end code snippet
# Globbing utilities:
def sorted_glob(pathname):#, cmp=None, key=None, reverse=None):

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