Auto start tmux session on fish shell

001_tmux_init.fish

if status is-interactive
    if not set -q TMUX
        if tmux list-sessions &>/dev/null
            set -l array

            for i in (tmux list-sessions -F "#{session_name} #{session_attached}")
                set -a array $i
            end

            if set -q array
                for j in (seq 1 100)
                    if echo $array | grep -w -q "default$j"
                        if test (echo $array[$j] | cut -d' ' -f2) -eq 0
                            # kill unattached sessions
                            tmux kill-session -t $(echo $array[$j] | cut -d' ' -f1)
                        end
                    else
                        # create session if no session with this name exist
                        tmux new-session -s default$j -c $PWD
                        break
                    end
                end
            else
                # create default0 session if no session exist
                tmux new-session -s default0 -c $PWD
            end
        else
            # create default0 session if no session exist
            tmux new-session -s default0 -c $PWD
        end
    end
end