#!/bin/sh

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

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

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

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