Activate ssh_agent in Fish

ssh_agent_start.fish

function start_agent
    echo "Initializing new SSH agent ..."
    ssh-agent -c | sed 's/^echo/#echo/' > $SSH_ENV
    echo "succeeded"
    chmod 600 $SSH_ENV
    . $SSH_ENV > /dev/null
    ssh-add
end

function test_identities
    ssh-add -l | grep "The agent has no identities" > /dev/null
    if [ $status -eq 0 ]
        ssh-add
        if [ $status -eq 2 ]
            start_agent
        end
    end
end

function ssh_agent_start
    setenv SSH_ENV $HOME/.ssh/environment

    if [ -n "$SSH_AGENT_PID" ]
        ps -ef | grep $SSH_AGENT_PID | grep ssh-agent > /dev/null
        if [ $status -eq 0 ]
            test_identities
        end
    else
        if [ -f $SSH_ENV ]
            . $SSH_ENV > /dev/null
        end
        ps -ef | grep $SSH_AGENT_PID | grep -v grep | grep ssh-agent > /dev/null
        if [ $status -eq 0 ]
            test_identities
        else
            start_agent
        end
    end
end