Setup fish shell to auto-start ssh_agent

config.fish

# Goes in ~/.config/fish/config.fish


# Start SSH agent
setenv SSH_ENV $HOME/.ssh/environment
start_agent

functions_start_agent.fish

# Goes in ~/.config/fish/functions/start_agent.fish
# Adapted from http://www.snip2code.com/Snippet/34752/ssh-agent-for-fish

# this script can never fail
# i use it in the fish_config
# call it with start_agent

function start_agent
    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
            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
    end
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 fish_title
    if [ $_ = 'fish' ]
    echo (prompt_pwd)
    else
        echo $_
    end
end