links

#!/usr/bin/env bash

now=$(date +"%Y.%m.%d.%H.%M.%S")
BACKUP_DIR="$HOME/.dotfiles_backup/$now"

usage() { echo "Usage: links [-f <FILENAME>]" 1>&2; exit 1; }

missing() { echo "File not found"; usage; }

link() {
	DEST="${2/#\~/$HOME}" # fix ~ not expanding inside if statement

	FILENAME="${1##*/}"
	if [[ -e "$DEST" && ! -L "$DEST" ]]; then
		mkdir -p "$BACKUP_DIR"
		mv "$DEST" "$BACKUP_DIR/$FILENAME"
		echo "$2 backed up"
	fi
	unlink "$DEST" > /dev/null 2>&1

	printf "linking $FILENAME... "
	ln -sfn "$1" "$DEST" > /dev/null 2>&1
	printf "OK\n"
}

read_file() {
	[ ! -f $1 ] && missing

	while IFS=\= read -r LOC DEST; do
		link "$(pwd)/$LOC" "$DEST"
	done < $1

	exit 0
}

while getopts ":f:h:" o; do
	case "${o}" in
		f)
			read_file ${OPTARG}
			;;
		h)
			usage
			;;
		*)
			usage
			;;
	esac
done

usage