popup={
    list = {},
    old_update = nil,
    current = nil,

    create = function(label,x,y)
        popup.list[label] = {x=x, y=y, width=50, options={}}
    end,

    addOption = function(parent, label, action)
        popup.list[parent].options[#popup.list[parent].options+1] = { label=label, action=action }
        local option_width = #label*4+4
        if option_width > popup.list[parent].width then
            popup.list[parent].width = option_width
        end
    end,

    show = function(label)
        popup.current = label
        app.push(popup.update)
    end,

    update = function()
        view.origin(0,0)
        local mx, my = mouse.pos()
        local p = popup.list[popup.current]
        draw.outset(p.x, p.y, p.width, #p.options*7+2)
        local y = p.y+2
        for k,v in ipairs(p.options) do
            local inside = util.inside(mx, my, {p.x, y-2, p.width, 7})
            if inside then
                draw.rectf(p.x+1, y-1, p.width-2, 7, 21)
                if mouse.press(mouse.LEFT) then
                    app.pop()
                    v.action()
                end
            end
            draw.text(v.label, p.x+2, y, 28)
            y = y + 7
        end

        local inside = util.inside(mx, my, {p.x, p.y, p.width, #p.options*7+2})
        if not inside and mouse.down(mouse.LEFT) then
            mouse.discard()
            app.pop()
        end
        if key.press(key.ESCAPE) then
            app.pop()
        end
    end

}