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