toggle.lua

awful.key({ modkey }, 't', function()
  local w = {}
  
  for _, c in ipairs(filter_ddt(get_tag_clients())) do
    local str = ('/tmp/%s.png'):format(tostring{}:match('0x([0-f]+)'))
    gears.surface(c.content):write_to_png(str)
  
    local font_orig = beautiful.font:match('^(.*) %d+$')
    local font_size = 14
    local font = ('%s %d'):format(font_orig, font_size)
  
    local size_base = 45
    local grid_width = size_base * 16
    local grid_height = size_base * 9
  
    local box = wibox.widget {
      {
        {
          text = c.name,
          font = font,
          align = 'center',
          opacity = 1,
          forced_width = grid_width,
          widget = wibox.widget.textbox,
        },
        fg = 'gray',
        widget = wibox.container.background
      },
      {
        image = str,
        widget = wibox.widget.imagebox,
        forced_height = grid_height,
        forced_width = grid_width
      },
      client = c,
      layout = wibox.layout.align.vertical,
      widget = wibox.container.background,
    }
  
    table.insert(w, box)
  end
  
  w.layout = wibox.layout.grid
  w.homogeneous = true
  w.spacing = 10
  
  if #w > 4 then
    w.forced_num_cols = 4
  end
  
  local popup = awful.popup {
    widget = {
      w,
      margins = 1,
      widget  = wibox.container.margin
    },
    placement = awful.placement.centered,
    hide_on_right_click = true,
    shape = gears.shape.rounded_rect,
    opacity = 0.9,
    ontop = true
  }
  
  for i = 1, #w do
    w[i]:connect_signal("button::press", function()
      client.focus = w[i].client
      client.focus:raise()
      popup.visible = false
    end)
  end
end)