41 lines
1.1 KiB
Bash
41 lines
1.1 KiB
Bash
|
#!/bin/bash
|
||
|
|
# From https://stackoverflow.com/questions/2564634/convert-absolute-path-into-relative-path-given-a-current-directory-using-bash
|
||
|
|
# both $1 and $2 are absolute paths beginning with /
|
||
|
|
# returns relative path to $2/$target from $1/$source
|
||
|
|
source=$1
|
||
|
|
target=$2
|
||
|
|
|
||
|
|
common_part=$source # for now
|
||
|
|
result="" # for now
|
||
|
|
|
||
|
|
while [[ "${target#$common_part}" == "${target}" ]]; do
|
||
|
|
# no match, means that candidate common part is not correct
|
||
|
|
# go up one level (reduce common part)
|
||
|
|
common_part="$(dirname $common_part)"
|
||
|
|
# and record that we went back, with correct / handling
|
||
|
|
if [[ -z $result ]]; then
|
||
|
|
result=".."
|
||
|
|
else
|
||
|
|
result="../$result"
|
||
|
|
fi
|
||
|
|
done
|
||
|
|
|
||
|
|
if [[ $common_part == "/" ]]; then
|
||
|
|
# special case for root (no common path)
|
||
|
|
result="$result/"
|
||
|
|
fi
|
||
|
|
|
||
|
|
# since we now have identified the common part,
|
||
|
|
# compute the non-common part
|
||
|
|
forward_part="${target#$common_part}"
|
||
|
|
|
||
|
|
# and now stick all parts together
|
||
|
|
if [[ -n $result ]] && [[ -n $forward_part ]]; then
|
||
|
|
result="$result$forward_part"
|
||
|
|
elif [[ -n $forward_part ]]; then
|
||
|
|
# extra slash removal
|
||
|
|
result="${forward_part:1}"
|
||
|
|
fi
|
||
|
|
|
||
|
|
echo $result
|