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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# vim: ts=4:sw=4:expandtab:
# Copyright 2008 Mark Mitchell
# All rights reserved.
# License: same as Python itself
# Use Python 3 print function in Python >= 2.6
from __future__ import print_function
import sys
import os, os.path
__doc__ = """Given two paths, one being a "top" directory,
and the other a file in a directory subordinate to the top directory,
returns a relative path from subdir to topdir.
Since this is intended for generating prefixes for constructing
relative URLs, the path separator in the output string is always
a forward slash, no matter what platform is used.
Usage:
relpath.py topdir subdir/filename
Examples:
args: foo foo/bar/plugh/index.html
returns: ../../
args: /usr/local/src/GraphicsMagick /usr/local/src/GraphicsMagick/www/index.html
returns: ../
"""
def rel_to_top(topdir, subdir):
if topdir == subdir:
return ''
head = subdir
count = 0
while True:
head, tail = os.path.split(head)
if head == topdir or tail == '':
break
count += 1
up = '/'.join(['..'] * count)
if up:
up += '/'
return up
if __name__ == '__main__':
if len(sys.argv) < 3:
print(__doc__)
sys.exit(1)
topdir = os.path.abspath(sys.argv[1])
subdir = os.path.abspath(sys.argv[2])
prefix = os.path.commonprefix([topdir, subdir])
if prefix != topdir:
print("'%s' is not a subordinate path of '%s'" % (subdir, topdir), file=sys.stderr)
sys.exit(1)
print((rel_to_top(topdir, subdir)))
sys.exit(0)
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