local function get_screen_id(s)
    local name = ""
    for i, e in pairs(s.outputs) do
        name = tostring(i)
    end
    return name
end

mydisplaymenu = awful.menu({ })

function display_menu ()
    local current_display = get_screen_id(awful.screen.focused())
    local terms = {}
    local displays = io.popen("xrandr | grep ' connected' | awk {'print $1'}")
    for l in displays:lines() do
        if l ~= current_display then
            local item = l 
            table.insert(terms, { current_display .. " <-> " .. item, { 
                                                    { "duplicate with " .. item, function() awful.util.spawn("displayexec.sh " .. current_display .. " duplicate " .. item) end },
                                                    {"switch to " .. item, function() awful.util.spawn("displayexec.sh " .. current_display .. " switch " .. item) end },
                                                    {"extend to " .. item, {
                                                                            {"left", function() awful.util.spawn("displayexec.sh " .. current_display .. " extend " .. item .. " left") end },
                                                                            {"above", function() awful.util.spawn("displayexec.sh " .. current_display .. " extend " .. item .. " above") end },
                                                                            {"right", function() awful.util.spawn("displayexec.sh " .. current_display .. " extend " .. item .. " right") end },
                                                                            {"below", function() awful.util.spawn("displayexec.sh " .. current_display .. " extend " .. item .. " below") end },
            }}}})
        end
    end
    displays:close()
    mydisplaymenu = awful.menu( { items = terms, theme = { width = 200 }} )
end

function display_menu_toggle_fn()
    instance = nil
    return function ()
        if instance and instance.wibox.visible then
            instance:hide()
            instance = nil
        else
            display_menu()
            instance = mydisplaymenu
            mydisplaymenu:update()
            mydisplaymenu:show()
        end
    end
end

display_widget = wibox.widget { widget = wibox.widget.textbox }
display_widget:set_text(" ▢ ")
display_widget:buttons(gears.table.join(
    awful.button({ }, 1, display_menu_toggle_fn() )
    ))