capistrano thingy to restart workers in tmux

deploy.rb

    set :tmux_session, "mailer"
    desc 'Restart workers'
    task :workers do
        tmux_window = 'workers'
        num_workers = 4
        worker_cmd = "'php #{current_release}/bin/worker.php'"

        exists = true

        run "tmux start"
        begin
            ret = run "tmux has-session -t #{tmux_session} 2>&-"
        rescue
            exists = false
        end

        if exists
            run "tmux kill-session -t #{tmux_session}"

            panes = capture "tmux lsp -t #{tmux_session}:#{tmux_window}"
            panes = panes.split(/\n/)
            num_workers = [num_workers, panes.count].max
            num_workers.times do |i|
               run "tmux respawn-pane -k -t #{tmux_session}:#{tmux_window}.#{i} #{worker_cmd}"
            end
        else
            run "tmux new-session -d -s #{tmux_session} -n #{tmux_window} #{worker_cmd}"
            (num_workers-1).times do
                run "tmux split-window -t #{tmux_session}:#{tmux_window} #{worker_cmd}"
            end
            # empty block to silence output -----------------------------------------v
            run "tmux select-layout -t #{tmux_session}:#{tmux_window} even-vertical" do end
        end


    end