#!/bin/sh
#
# SSH key indicator for ssh-agent
#
# Copyright (C) 2012 Mike Gerwitz
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# The rationale behind the coloring is simply that, without the key in the
# agent, I will be prompted for passwords for (depending on location)
# numerous boxes---a frustrating task. However, the reverse coloring would
# be equally applicable---remote systems are more vulnerable if someone has
# access to your agent. I take precautions to make the latter incredibly
# difficult.
##

. ~/.ssh/.agent
keys="$( ssh-add -L | grep ^ssh | wc -l )"

# green if keys exist in agent, otherwise yellow
color=g
[ "$keys" -eq 0 ] && color=y

# red if agent is not started
[ -z "$SSH_AGENT_PID" ] && color=r

echo -n "\005{+ ."$color"}*\005{-}"