persist window geometry to disk across restart

main.lua

@@ -54,11 +54,29 @@ end
 
 function love.quit()
   if on.quit then on.quit() end
-  -- TODO: save settings
+  love.filesystem.write('config', json.encode(settings()))
+end
+
+function settings()
+  local x, y, displayindex = App.screen.position()
+  return {
+    x=x, y=y, displayindex=displayindex,
+    width=App.screen.width, height=App.screen.height,
+  }
 end
 
 function load_settings()
   if love.filesystem.getInfo('config') then
+    local settings = json.decode(love.filesystem.read('config'))
+    local width, height, flags = love.window.getMode()
+    flags.resizable = true
+    flags.minwidth = math.min(width, 200)
+    flags.minheight = math.min(height, 200)
+    App.screen.flags = flags
+    App.screen.width = settings.width
+    App.screen.height = settings.height
+    love.window.setMode(App.screen.width, App.screen.height, App.screen.flags)
+    love.window.setPosition(settings.x, settings.y, settings.displayindex)
   else
     local font_height = 20
     love.graphics.setFont(love.graphics.newFont(font_height))