#!/bin/bash

if [ $# -ne 3 ]; then
	echo "Usage: $0 force-y-or-n point-to symlink-goes-where" >&2
	echo "(order is just like ln -s)" >&2
	exit 1
fi

force="$1"
ptr="$2"
link="$3"

if [ -h "$link" ]; then
	rm "$link"
elif [ -e "$link" ]; then
	echo -n "Conflicting $link found... "
	if [ "y" = "$force" ]; then
		echo "moving."
		mv -i "$link" "$link.old" || exit 1
	elif [ "n" = "$force" ]; then
		echo "aborted.";
		exit 1
	else
		echo -n "Move out the way? (y/n): "
		read -r -n 1
		echo
		if [ 'y' = "$REPLY" ]; then
			mv -i "$link" "$link.old" || exit 1
		else
			exit 1
		fi
	fi
fi

# Ancient machines may not have the -r option, use readlink instead.
# We'll just assume any failure is due to the bad option. If not, it'll
# just fail again...
ln -rs "$ptr" "$link" || ln -s "$(readlink -f "$ptr")" "$link" || exit 1