sshi.bash

sshi() {
	if [ $# -eq 0 ]
	then	
		ssh
		return $?
	fi

	username=$(echo -n "${1}" | grep -oP "^.*@")
	if [ "${username}" == "" ]
	then
		username=$(whoami)
	else
		# remove @
		username=${username:0:${#username}-1}
		if [ "${username}" == "" ]
		then
			username=$(whoami)
		fi
	fi

	target_host=$(echo -n "${1}" | grep -oP "@.*$")
	if [ "${target_host}" == "@" ]
	then
		target_host=$(hostname)
	elif [ "${target_host:0:1}" == "@" ]
	then
		# remove @
		target_host="${target_host:1}"
	elif [ "${target_host}" == "" ]
	then
		target_host="${1}"
	fi

	key=""
	if [ -f "${HOME}/.ssh/$(whoami)-$(hostname)-${username}-${target_host}.id_rsa" ]
	then
		key="${HOME}/.ssh/$(whoami)-$(hostname)-${username}-${target_host}.id_rsa"
	elif [ -f "${HOME}/.ssh/${username}-${target_host}.id_rsa" ]
	then
		key="${HOME}/.ssh/${username}-${target_host}.id_rsa"
	elif [ -f "${HOME}/.ssh/$(whoami)-$(hostname)-${username}-$(echo ${target_host} | sed -r 's/[0-9]+$//g').id_rsa" ]
	then
		key="${HOME}/.ssh/$(whoami)-$(hostname)-${username}-$(echo ${target_host} | sed -r 's/[0-9]+$//g').id_rsa"
	else
		>&2 echo "Cannot find keyfile for target ${1}: ${username}@${target_host}"
		return 1
	fi

	ssh -i "${key}" "${username}@${target_host}" "${@:2}"
}