adding a signal.

it is controllable by mesecons and by right click. it does not influence trains

init.lua

@@ -22,5 +22,6 @@ dofile(advtrains.modpath.."/pseudoload.lua");
 dofile(advtrains.modpath.."/couple.lua");
 dofile(advtrains.modpath.."/damage.lua");
 
+dofile(advtrains.modpath.."/signals.lua");
 dofile(advtrains.modpath.."/misc_nodes.lua");
 dofile(advtrains.modpath.."/crafting.lua");

signals.lua

@@ -0,0 +1,31 @@
+--advtrains by orwell96
+--signals.lua
+
+for r,f in pairs({on="off", off="on"}) do
+	minetest.register_node("advtrains:retrosignal_"..r, {
+		drawtype = "mesh",
+		paramtype="light",
+		paramtype2="facedir",
+		walkable = false,
+		selection_box = {
+			type = "fixed",
+			fixed = {-1/4, -1/2, -1/4, 1/4, 2, 1/4},
+		},
+		mesh = "advtrains_retrosignal_"..r..".b3d",
+		tiles = {"advtrains_retrosignal.png"},
+		description="Lampless Signal ("..r..")",
+		on_rightclick=switchfunc,
+		groups = {
+			choppy=3,
+			not_blocking_trains=1
+		},
+		mesecons = {effector = {
+			action_on = function (pos, node)
+				minetest.swap_node(pos, {name = "advtrains:retrosignal_"..f, param2 = node.param2})
+			end
+		}},
+		on_rightclick=function(pos, node, clicker)
+			minetest.swap_node(pos, {name = "advtrains:retrosignal_"..f, param2 = node.param2})
+		end,
+	})
+end