#!/bin/sh

die() {
	printf "$1" >&2
	exit ${2:-1}
}

remote="$(git remote get-url origin)"
! grep -q '^git@' <<<"$remote" || die "Using ssh already.\n" 0

host="$(cut -d/ -f3 <<<"$remote")"
grep -q "$host" "$HOME"/.ssh/known_hosts || die "No ssh key for $host found.\n"

ssh_remote="$(sed 's_^https\?://_git@_;s_/_:_' <<<"$remote")"
git remote set-url origin "$ssh_remote"
die "Set origin remote url to $ssh_remote\n" $?