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#!/bin/bash
#
# Copyright (C) 2009 by Marc Kleine-Budde <mkl@pengutronix.de>
# For further information about the PTXdist project and license conditions
# see the README file.
#
ptxd_abs2rel() {
local from from_parts to to_parts max orig_IFS
[ ${#} -eq 2 ] || { echo "supply exactly two paths" >&2; exit 1; }
from="${1}"
to="${2}"
orig_IFS="${IFS}"
IFS="/"
from_parts=(${from#/})
to_parts=(${to#/})
if [ ${#from_parts[@]} -gt ${#to_parts[@]} ]; then
max=${#from_parts[@]}
else
max=${#to_parts[@]}
fi
for ((i = 0; i < ${max}; i++)); do
from="${from_parts[i]}"
to="${to_parts[i]}"
if [ "${from}" = "${to}" ]; then
unset from_parts[$i]
unset to_parts[$i]
elif [ -n "${from}" ]; then
from_parts[$i]=".."
fi
done
echo "${from_parts[*]}${from_parts[*]:+/}${to_parts[*]}"
IFS="${orig_IFS}"
}
ptxd_abs2rel "${@}"
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