Adding item display entities to the builder heads

entities.lua

@@ -49,3 +49,40 @@ minetest.register_entity("digtron:marker_vertical", {
 		self.object:remove()
 	end,
 })
+
+minetest.register_entity("digtron:builder_item", {
+
+	initial_properties = {
+		hp_max = 1,
+		is_visible = true,
+		visual = "wielditem",
+		visual_size = {x=0.25, y=0.25},
+		collisionbox = {0,0,0,0,0,0},
+		physical = false,
+		textures = {""},
+		automatic_rotate = math.pi * 0.25,
+	},
+	
+	on_activate = function(self, staticdata)
+		local props = self.object:get_properties()
+		if staticdata ~= nil and staticdata ~= "" then
+			props.textures = {staticdata}
+			self.object:set_properties(props)
+		elseif digtron.create_builder_item ~= nil then
+			minetest.debug("creating builder item", digtron.create_builder_item)
+			props.textures = {digtron.create_builder_item}
+			self.object:set_properties(props)
+			digtron.create_builder_item = nil
+		else
+			self.object:remove()
+		end		
+	end,
+	
+	get_staticdata = function(self)
+		local props = self.object:get_properties()
+		if props ~= nil and props.textures ~= nil and props.textures[1] ~= nil then
+			return props.textures[1]
+		end
+		return ""
+	end,
+})

node_builders.lua

@@ -123,7 +123,13 @@ minetest.register_node("digtron:builder", {
 			if build_facing and build_facing >= 0 and build_facing < 24 then
 				meta:set_int("build_facing", math.floor(build_facing))
 			end
-		end		
+		end
+
+		digtron.update_builder_item(pos)
+	end,
+	
+	on_destruct = function(pos)
+		digtron.remove_builder_item(pos)
 	end,
 
 	-- "builder at pos, imagine that you're in test_pos. If you're willing and able to build from there, take the item you need from inventory.

util.lua

@@ -104,7 +104,11 @@ digtron.move_node = function(pos, newpos)
 	newmeta:set_int("build_facing", oldmeta:get_int("build_facing"))
 	newmeta:set_float("fuel_burning", oldmeta:get_float("fuel_burning"))
 	newmeta:set_string("infotext", oldmeta:get_string("infotext"))
-		
+	
+	if minetest.get_item_group(node.name, "digtron") == 4 then
+		digtron.update_builder_item(newpos)
+	end
+	
 	-- remove node from old position
 	minetest.remove_node(pos)
 end
@@ -365,4 +369,26 @@ digtron.burn = function(fuelstore_positions, target, test)
 		end
 	end
 	return current_burned
+end
+
+digtron.remove_builder_item = function(pos)
+	minetest.debug("removing builder item")
+	local objects = minetest.env:get_objects_inside_radius(pos, 0.5)
+	if objects ~= nil then
+		for _, obj in ipairs(objects) do
+			if obj and obj:get_luaentity() and obj:get_luaentity().name == "digtron:builder_item" then
+				obj:remove()
+			end
+		end
+	end
+end
+
+digtron.update_builder_item = function(pos)
+	digtron.remove_builder_item(pos)
+	local inv = minetest.get_inventory({type="node", pos=pos})
+	local item_stack = inv:get_stack("main", 1)
+	if not item_stack:is_empty() then
+		digtron.create_builder_item = item_stack:get_name()
+		minetest.add_entity(pos,"digtron:builder_item")
+	end
 end