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#!/bin/sh
relativepath() (
# both $1 and $2 are absolute paths beginning with /
# returns relative path to $2 from $1
source="$1"
target="$2"
commonPart="$source"
result=""
while [ "${target#"$commonPart"}" = "${target}" ]; do
# no match, means that candidate common part is not correct
# go up one level (reduce common part)
commonPart="$(dirname "$commonPart")"
# and record that we went back, with correct / handling
if [ -z $result ]; then
result=".."
else
result="../$result"
fi
done
if [ "$commonPart" = "/" ]; then
# special case for root (no common path)
result="$result/"
fi
# since we now have identified the common part,
# compute the non-common part
forwardPart="${target#"$commonPart"}"
# and now stick all parts together
if [ -n "$result" ] && [ -n "$forwardPart" ]; then
result="$result$forwardPart"
elif [ -n "$forwardPart" ]; then
# extra slash removal
result="${forwardPart#/}"
fi
echo "$result"
)
relativepath "$@"
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