Make the lane control lights work and add a downward-pointing yellow arrow

infrastructure/advanced_lane_control_lights.lua

@@ -1,20 +1,6 @@
 -- Lane control lights
-function lane_control_change(pos, node)
-	local node = minetest.env:get_node(pos)
-	if node.name == "infrastructure:lane_control_lights_1" then
-		minetest.swap_node(pos, {name = "infrastructure:lane_control_lights_2", param2 = node.param2})
-	elseif node.name == "infrastructure:lane_control_lights_2" then
-		minetest.swap_node(pos, {name = "infrastructure:lane_control_lights_3", param2 = node.param2})
-	elseif node.name == "infrastructure:lane_control_lights_3" then
-		minetest.swap_node(pos, {name = "infrastructure:lane_control_lights_4", param2 = node.param2})
-	elseif node.name == "infrastructure:lane_control_lights_4" then
-		minetest.swap_node(pos, {name = "infrastructure:lane_control_lights_5", param2 = node.param2})
-	elseif node.name == "infrastructure:lane_control_lights_5" then
-		minetest.swap_node(pos, {name = "infrastructure:lane_control_lights_1", param2 = node.param2})
-	end
-end
 
-for i = 1, 5 do
+for i = 1, 6 do
 	local groups = {}
 	if i == 1 then 
 		groups = {cracky = 3}
@@ -35,6 +21,10 @@ for i = 1, 5 do
 		drawtype = "nodebox",
 		paramtype = "light",
 		paramtype2 = "facedir",
+		on_construct = function(pos)
+			local meta = minetest.get_meta(pos)
+			meta:set_string("formspec", "field[channel;Channel;${channel}]")
+		end,
 		groups = {cracky = 3, not_in_creative_inventory = (i == 1 and 0 or 1)},
 		light_source = TRAFFIC_LIGHTS_LIGHT_RANGE,
 		drop = "infrastructure:lane_control_lights_1",
@@ -63,16 +53,38 @@ for i = 1, 5 do
 				}
 
 		},
-
-		on_punch = function(pos, node)
-			lane_control_change(pos, node)
+		on_receive_fields = function(pos, formname, fields)
+			if (fields.channel) then
+				minetest.get_meta(pos):set_string("channel", fields.channel)
+			end
 		end,
-
-		mesecons = {effector = {
-			action_on = function (pos, node)
-				lane_control_change(pos, node)
-			end,
-		}}
+		digiline = {
+			receptor = {},
+			effector = {
+				action = function(pos, node, channel, msg)
+					local setchan = minetest.get_meta(pos):get_string("channel")
+					if setchan ~= channel then
+						return
+					end
+					msg = msg:lower()
+					if (msg=="off") then
+						node.name = "infrastructure:lane_control_lights_1"
+					elseif (msg=="green") then
+						node.name = "infrastructure:lane_control_lights_3"
+					elseif (msg=="red") then
+						node.name = "infrastructure:lane_control_lights_2"
+					elseif (msg=="yellowleft") then
+						node.name = "infrastructure:lane_control_lights_5"
+					elseif (msg=="yellowright") then
+						node.name = "infrastructure:lane_control_lights_4"
+					elseif (msg=="yellow") then
+						node.name = "infrastructure:lane_control_lights_6"
+					end
+					minetest.set_node(pos,node)
+					minetest.get_meta(pos):set_string("channel",setchan)
+				end
+			}
+		}
 	})
 end