mirror of
https://github.com/haskell/haskell-language-server.git
synced 2024-07-14 18:50:21 +03:00
106 lines
3.1 KiB
Bash
Executable File
106 lines
3.1 KiB
Bash
Executable File
#!/bin/sh
|
||
|
||
# POSIX shell implementation of `realpath --relative-to=$1 $2.
|
||
# This is an adaptation of the implementation from
|
||
# <https://github.com/Offirmo/offirmo-shell-lib>.
|
||
|
||
# returns relative path to $2=$target from $1=$source
|
||
## NOTE : path are compared in text only. They don’t have to exist
|
||
## and they WONT be normalized/escaped
|
||
## Result in "$return_value"# both $1 and $2 are absolute paths beginning with /
|
||
|
||
# @FUNCTION: die
|
||
# @USAGE: [msg]
|
||
# @DESCRIPTION:
|
||
# Exits the shell script with status code 2
|
||
# and prints the given message in red to STDERR, if any.
|
||
die() {
|
||
(>&2 echo "$1")
|
||
exit 2
|
||
}
|
||
|
||
# @FUNCTION: posix_realpath
|
||
# @USAGE: <file>
|
||
# @DESCRIPTION:
|
||
# Portably gets the realpath and prints it to stdout.
|
||
# This was initially inspired by
|
||
# https://gist.github.com/tvlooy/cbfbdb111a4ebad8b93e
|
||
# and
|
||
# https://stackoverflow.com/a/246128
|
||
#
|
||
# If the file does not exist, just prints it appended to the current directory.
|
||
# @STDOUT: realpath of the given file
|
||
posix_realpath() {
|
||
[ -z "$1" ] && die "Internal error: no argument given to posix_realpath"
|
||
current_loop=0
|
||
max_loops=50
|
||
mysource=$1
|
||
|
||
while [ -h "${mysource}" ]; do
|
||
current_loop=$((current_loop+1))
|
||
mydir="$( cd -P "$( dirname "${mysource}" )" > /dev/null 2>&1 && pwd )"
|
||
mysource="$(readlink "${mysource}")"
|
||
[ "${mysource%${mysource#?}}"x != '/x' ] && mysource="${mydir}/${mysource}"
|
||
|
||
if [ ${current_loop} -gt ${max_loops} ] ; then
|
||
(>&2 echo "${1}: Too many levels of symbolic links")
|
||
exit 1
|
||
fi
|
||
done
|
||
mydir="$( cd -P "$( dirname "${mysource}" )" > /dev/null 2>&1 && pwd )"
|
||
|
||
# TODO: better distinguish between "does not exist" and "permission denied"
|
||
if [ -z "${mydir}" ] ; then
|
||
(>&2 echo "${1}: Permission denied")
|
||
echo "$(pwd)/$1"
|
||
else
|
||
echo "${mydir%/}/$(basename "${mysource}")"
|
||
fi
|
||
|
||
unset current_loop max_loops mysource mydir
|
||
}
|
||
|
||
|
||
src="$(posix_realpath $1)" || exit 1
|
||
target="$(posix_realpath $2)" || exit 1
|
||
|
||
common_part="$src"
|
||
result=""
|
||
|
||
while test "${target#$common_part}" = "${target}" ; do
|
||
#echo "common_part is now : \"$common_part\""
|
||
#echo "result is now : \"$result\""
|
||
#echo "target#common_part : \"${target#$common_part}\""
|
||
# no match, means that candidate common part is not correct
|
||
# go up one level (reduce common part)
|
||
common_part="$(dirname "$common_part")"
|
||
# and record that we went back
|
||
if test -z "$result" ; then
|
||
result=".."
|
||
else
|
||
result="../$result"
|
||
fi
|
||
done
|
||
|
||
#echo "common_part is : \"$common_part\""
|
||
|
||
if test "$common_part" = "/" ; then
|
||
# special case for root (no common path)
|
||
result="$result/"
|
||
fi
|
||
|
||
# since we now have identified the common part,
|
||
# compute the non-common part
|
||
forward_part="${target#$common_part}"
|
||
#echo "forward_part = \"$forward_part\""
|
||
|
||
if test -n "$result" && test -n "$forward_part" ; then
|
||
#echo "(simple concat)"
|
||
result="$result$forward_part"
|
||
elif test -n "$forward_part" ; then
|
||
#echo "(concat with slash removal)"
|
||
result="$(printf "%s" "$forward_part" | cut -c 1-)"
|
||
fi
|
||
|
||
printf "%s" "$result"
|