tssh.fish

function tssh --description="SSH to a machine using its Tailscale IP." --argument-names=target_host
    # Find the `tailscale` executable
    set cmd '/Applications/Tailscale.app/Contents/MacOS/Tailscale'
    if not test -x $cmd
        set cmd (which tailscale)
        if test $status != 0
            set_color red
            printf "ERROR "
            set_color normal
            echo "Could not find Tailscale binary" >&2
            return 1
        end
    end
    # Resolve the hostname to a Tailscale IP
    set host_ip ($cmd ip -4 $target_host 2>/dev/null)
    if test $status != 0
        set_color red
        printf "ERROR "
        set_color normal
        echo "Failed to resolve Tailscale IP for host '$target_host'" >&2
        return 1
    end
    # TODO should all the arguments `ssh` does, including username overriding.
    ssh ubuntu@$host_ip
end