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#!/usr/bin/env python
#
# relpath.py
# R.Barran 30/08/2004
# Retrieved from http://code.activestate.com/recipes/302594/
import os
import sys
def relpath(target, base=os.curdir):
"""
Return a relative path to the target from either the current dir or an optional base dir.
Base can be a directory specified either as absolute or relative to current dir.
"""
if not os.path.exists(target):
raise OSError, 'Target does not exist: '+target
if not os.path.isdir(base):
raise OSError, 'Base is not a directory or does not exist: '+base
base_list = (os.path.abspath(base)).split(os.sep)
target_list = (os.path.abspath(target)).split(os.sep)
# On the windows platform the target may be on a completely different drive from the base.
if os.name in ['nt','dos','os2'] and base_list[0] <> target_list[0]:
raise OSError, 'Target is on a different drive to base. Target: '+target_list[0].upper()+', base: '+base_list[0].upper()
# Starting from the filepath root, work out how much of the filepath is
# shared by base and target.
for i in range(min(len(base_list), len(target_list))):
if base_list[i] <> target_list[i]: break
else:
# If we broke out of the loop, i is pointing to the first differing path elements.
# If we didn't break out of the loop, i is pointing to identical path elements.
# Increment i so that in all cases it points to the first differing path elements.
i+=1
rel_list = [os.pardir] * (len(base_list)-i) + target_list[i:]
if (len(rel_list) == 0):
return "."
return os.path.join(*rel_list)
if __name__ == "__main__":
print(relpath(sys.argv[1], sys.argv[2]))
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