Make placeholders not pointable

Thanks to entuland for the Rhotator facedir to matrix and matrix to facedir code, which helped creating the tables.

worldedit/manipulations.lua

@@ -529,20 +529,22 @@ end
 -- @param pos2
 -- @param angle Angle in degrees (90 degree increments only).
 -- @return The number of nodes oriented.
--- TODO: Support 6D facedir rotation along arbitrary axis.
 function worldedit.orient(pos1, pos2, angle)
 	local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
 	local registered_nodes = minetest.registered_nodes
 
 	local wallmounted = {
-		[90]  = {[0]=0, 1, 5, 4, 2, 3},
-		[180] = {[0]=0, 1, 3, 2, 5, 4},
-		[270] = {[0]=0, 1, 4, 5, 3, 2}
+		[90]  = {0, 1, 5, 4, 2, 3, 0, 0},
+		[180] = {0, 1, 3, 2, 5, 4, 0, 0},
+		[270] = {0, 1, 4, 5, 3, 2, 0, 0}
 	}
 	local facedir = {
-		[90]  = {[0]=1, 2, 3, 0},
-		[180] = {[0]=2, 3, 0, 1},
-		[270] = {[0]=3, 0, 1, 2}
+		[90]  = { 1,  2,  3,  0, 13, 14, 15, 12, 17, 18, 19, 16,
+				  9, 10, 11,  8,  5,  6,  7,  4, 23, 20, 21, 22},
+		[180] = { 2,  3,  0,  1, 10, 11,  8,  9,  6,  7,  4,  5,
+				 18, 19, 16, 17, 14, 15, 12, 13, 22, 23, 20, 21},
+		[270] = { 3,  0,  1,  2, 19, 16, 17, 18, 15, 12, 13, 14,
+				  7,  4,  5,  6, 11,  8,  9, 10, 21, 22, 23, 20}
 	}
 
 	angle = angle % 360
@@ -558,8 +560,7 @@ function worldedit.orient(pos1, pos2, angle)
 	worldedit.keep_loaded(pos1, pos2)
 
 	local count = 0
-	local set_node, get_node, get_meta, swap_node = minetest.set_node,
-			minetest.get_node, minetest.get_meta, minetest.swap_node
+	local get_node, swap_node = minetest.get_node, minetest.swap_node
 	local pos = {x=pos1.x, y=0, z=0}
 	while pos.x <= pos2.x do
 		pos.y = pos1.y
@@ -569,17 +570,20 @@ function worldedit.orient(pos1, pos2, angle)
 				local node = get_node(pos)
 				local def = registered_nodes[node.name]
 				if def then
-					if def.paramtype2 == "wallmounted" then
-						node.param2 = wallmounted_substitution[node.param2]
-						local meta = get_meta(pos):to_table()
-						set_node(pos, node)
-						get_meta(pos):from_table(meta)
+					local paramtype2 = def.paramtype2
+					if paramtype2 == "wallmounted" or
+							paramtype2 == "colorwallmounted" then
+						local orient = node.param2 % 8
+						node.param2 = node.param2 - orient +
+								wallmounted_substitution[orient + 1]
+						swap_node(pos, node)
 						count = count + 1
-					elseif def.paramtype2 == "facedir" then
-						node.param2 = facedir_substitution[node.param2]
-						local meta = get_meta(pos):to_table()
-						set_node(pos, node)
-						get_meta(pos):from_table(meta)
+					elseif paramtype2 == "facedir" or
+							paramtype2 == "colorfacedir" then
+						local orient = node.param2 % 32
+						node.param2 = node.param2 - orient +
+								facedir_substitution[orient + 1]
+						swap_node(pos, node)
 						count = count + 1
 					end
 				end

worldedit/serialization.lua

@@ -56,10 +56,19 @@ function worldedit.serialize(pos1, pos2)
 
 	worldedit.keep_loaded(pos1, pos2)
 
+	local get_node, get_meta, hash_node_position =
+		minetest.get_node, minetest.get_meta, minetest.hash_node_position
+
+	-- Find the positions which have metadata
+	local has_meta = {}
+	local meta_positions = minetest.find_nodes_with_meta(pos1, pos2)
+	for i = 1, #meta_positions do
+		has_meta[hash_node_position(meta_positions[i])] = true
+	end
+
 	local pos = {x=pos1.x, y=0, z=0}
 	local count = 0
 	local result = {}
-	local get_node, get_meta = minetest.get_node, minetest.get_meta
 	while pos.x <= pos2.x do
 		pos.y = pos1.y
 		while pos.y <= pos2.y do
@@ -68,20 +77,19 @@ function worldedit.serialize(pos1, pos2)
 				local node = get_node(pos)
 				if node.name ~= "air" and node.name ~= "ignore" then
 					count = count + 1
-					local meta = get_meta(pos):to_table()
 
-					local meta_empty = true
-					-- Convert metadata item stacks to item strings
-					for name, inventory in pairs(meta.inventory) do
-						for index, stack in ipairs(inventory) do
-							meta_empty = false
-							inventory[index] = stack.to_string and stack:to_string() or stack
-						end
-					end
-					for k in pairs(meta) do
-						if k ~= "inventory" then
-							meta_empty = false
-							break
+					local meta
+					if has_meta[hash_node_position(pos)] then
+						meta = get_meta(pos):to_table()
+
+						-- Convert metadata item stacks to item strings
+						for _, invlist in pairs(meta.inventory) do
+							for index = 1, #invlist do
+								local itemstack = invlist[index]
+								if itemstack.to_string then
+									invlist[index] = itemstack:to_string()
+								end
+							end
 						end
 					end
 
@@ -92,7 +100,7 @@ function worldedit.serialize(pos1, pos2)
 						name = node.name,
 						param1 = node.param1 ~= 0 and node.param1 or nil,
 						param2 = node.param2 ~= 0 and node.param2 or nil,
-						meta = not meta_empty and meta or nil,
+						meta = meta,
 					}
 				end
 				pos.z = pos.z + 1
@@ -188,7 +196,7 @@ end
 -- @return The number of nodes.
 function worldedit.allocate(origin_pos, value)
 	local nodes = load_schematic(value)
-	if not nodes then return nil end
+	if not nodes or #nodes == 0 then return nil end
 	return worldedit.allocate_with_nodes(origin_pos, nodes)
 end
 
@@ -219,6 +227,7 @@ end
 function worldedit.deserialize(origin_pos, value)
 	local nodes = load_schematic(value)
 	if not nodes then return nil end
+	if #nodes == 0 then return #nodes end
 
 	local pos1, pos2 = worldedit.allocate_with_nodes(origin_pos, nodes)
 	worldedit.keep_loaded(pos1, pos2)

worldedit/visualization.lua

@@ -6,6 +6,7 @@ minetest.register_node("worldedit:placeholder", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	diggable = false,
+	pointable = false,
 	walkable = false,
 	groups = {not_in_creative_inventory=1},
 })

worldedit_commands/init.lua

@@ -1163,9 +1163,15 @@ minetest.register_chatcommand("/allocate", {
 			return
 		elseif version > worldedit.LATEST_SERIALIZATION_VERSION then
 			worldedit.player_notify(name, "File was created with newer version of WorldEdit!")
+			return
 		end
 		local nodepos1, nodepos2, count = worldedit.allocate(pos, value)
 
+		if not nodepos1 then
+			worldedit.player_notify(name, "Schematic empty, nothing allocated")
+			return
+		end
+
 		worldedit.pos1[name] = nodepos1
 		worldedit.mark_pos1(name)
 		worldedit.pos2[name] = nodepos2