twnlua: partial impl for return propagation, input now works

apps/twnlua/data/scripts/game.lua

@@ -4,6 +4,11 @@ offset = { x = 0, y = 0 }
 angle = 0
 
 function game_tick()
+    input.action {
+        name = "press",
+        control = "A"
+    }
+
     draw.rectangle {
         rect = { x = 0, y = 0, w = 640, h = 360 },
         color = { r = 127, g = 0, b = 127, a = 255 },
@@ -19,11 +24,13 @@ function game_tick()
         },
     }
 
-    draw.text {
-        string = "it never happened",
-        position = offset,
-        font = "/fonts/kenney-pixel.ttf",
-    }
+    if input.action_pressed { name = "press" } then
+        draw.text {
+            string = "it never happened",
+            position = offset,
+            font = "/fonts/kenney-pixel.ttf",
+        }
+    end
 
     offset.x = ORIGIN.x + (math.cos(angle) * RADIUS)
     offset.y = ORIGIN.y + (math.sin(angle) * RADIUS)