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#!/bin/sh
# rellns-sh - Simplified ln program to generate relative symbolic link.
# Copyright (C) 1996-2022 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <https://www.gnu.org/licenses/>.
# With -p, instead of creating the link print the computed relative link
# name.
do_print=false
case $1 in
-p)
do_print=true
shift
;;
esac
if test $# -ne 2; then
echo "Usage: rellns [-p] SOURCE DEST" >&2
exit 1
fi
# Make both paths absolute.
if test -d $1; then
to=`cd $1 && pwd -P`
else
temp=`echo $1 | sed 's%/*[^/]*$%%'`
if test -z "$temp"; then
to=`pwd -P`
else
to=`cd $temp && pwd -P`
fi
to="$to/`echo $1 | sed 's%.*/\([^/][^/]*\)$%\1%'`"
fi
to=`echo $to | sed 's%^/%%'`
if test -d $2; then
from=`echo $2 | sed 's%/*$%%'`
else
from=`echo $2 | sed 's%/*[^/]*$%%'`
fi
if test -z "$from"; then
from=`pwd -P | sed 's%^/%%'`
else
from=`cd $from && pwd -P | sed 's%^/%%'`
fi
while test -n "$to" && test -n "$from"; do
preto=`echo $to | sed 's%^\([^/]*\)/.*%\1%'`
prefrom=`echo $from | sed 's%^\([^/]*\)/.*%\1%'`
test "$preto" != "$prefrom" && break
to=`echo $to | sed 's%^[^/]*/*\(.*\)$%\1%'`
from=`echo $from | sed 's%^[^/]*/*\(.*\)$%\1%'`
done
while test -n "$from"; do
rfrom="../$rfrom"
from=`echo $from | sed 's%^[^/]*/*%%'`
done
if $do_print; then
echo "$rfrom$to"
else
ln -s $rfrom$to $2
fi
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