conkyrc

own_window yes
own_window_type panel
 
alignment tl
minimum_size 500 500
 
lua_load dock.lua
lua_draw_hook_pre draw_pre
 
TEXT
$updates

script.lua

require("cairo")

local function context()
  if conky_window == nil then return nil end
 
  local surface = cairo_xlib_surface_create(conky_window.display, conky_window.drawable, conky_window.visual, conky_window.width, conky_window.height)
  local context = cairo_create(surface)
 
  return context
end 

function conky_draw_hook_pre()
  local c = context()
  if c == nil then return end

  cairo_set_source_rgb(c, 1, 0, 0)
  cairo_rectangle(c, 10, 0, 20, 20)
  cairo_fill(c)
end