Add //homogenize, //lua, and //luatransform commands, as well as their documentation.

Chat Commands.md

@@ -238,4 +238,18 @@ Save the current WorldEdit region including metadata to "(world folder)/schems/<
 Load nodes and metadata from "(world folder)/schems/<file>.wem" with position 1 of the current WorldEdit region as the origin.
 
     //metaload some random filename
-    //metaload huge_base
+    //metaload huge_base
+
+### //lua <code>
+
+Executes <code> as a Lua chunk in the global namespace.
+
+    //lua worldedit.pos1["singleplayer"] = {x=0, y=0, z=0}
+    //lua worldedit.rotate(worldedit.pos1["singleplayer"], worldedit.pos2["singleplayer"], "y", 90)
+
+### //luatransform <code>
+
+Executes <code> as a Lua chunk in the global namespace with the variable pos available, for each node in the current WorldEdit region.
+
+    //luatransform minetest.env:add_node(pos, {name="default:stone"})
+    //luatransform if minetest.env:get_node(pos).name == "air" then minetest.env:add_node(pos, {name="default:water_source"})

WorldEdit API.md

@@ -182,4 +182,20 @@ Returns the number of nodes saved.
 
 Loads the nodes and meta from `file` to position `pos1`.
 
-Returns the number of nodes loaded.
+Returns the number of nodes loaded.
+
+Code
+----
+Contained in code.lua, this module allows arbitrary Lua code to be used with WorldEdit.
+
+### error = worldedit.lua(code)
+
+Executes `code` as a Lua chunk in the global namespace.
+
+Returns an error if the code fails or nil otherwise.
+
+### error = worldedit.luatransform(pos1, pos2, code)
+
+Executes `code` as a Lua chunk in the global namespace with the variable pos available, for each node in a region defined by positions `pos1` and `pos2`.
+
+Returns an error if the code fails or nil otherwise.

worldedit/code.lua

@@ -0,0 +1,43 @@
+worldedit = worldedit or {}
+
+--executes `code` as a Lua chunk in the global namespace, returning an error if the code fails or nil otherwise
+worldedit.lua = function(code)
+	local operation, message = loadstring(code)
+	if operation == nil then --code parsing failed
+		return message
+	end
+	local status, message = pcall(operation)
+	if status == nil then --operation failed
+		return message
+	end
+	return nil
+end
+
+--executes `code` as a Lua chunk in the global namespace with the variable pos available, for each node in a region defined by positions `pos1` and `pos2`, returning an error if the code fails or nil otherwise
+worldedit.luatransform = function(pos1, pos2, code)
+	local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
+
+	local factory, message = loadstring("return function(pos) " .. code .. " end")
+	if factory == nil then --code parsing failed
+		return message
+	end
+	local operation = factory()
+
+	local pos = {x=pos1.x, y=0, z=0}
+	while pos.x <= pos2.x do
+		pos.y = pos1.y
+		while pos.y <= pos2.y do
+			pos.z = pos1.z
+			while pos.z <= pos2.z do
+				local status, message = pcall(operation, pos)
+				if status == nil then --operation failed
+					return message
+				end
+				pos.z = pos.z + 1
+			end
+			pos.y = pos.y + 1
+		end
+		pos.x = pos.x + 1
+	end
+	return nil
+end

worldedit/init.lua

@@ -1,4 +1,6 @@
-dofile(minetest.get_modpath("worldedit") .. "/manipulations.lua")
-dofile(minetest.get_modpath("worldedit") .. "/primitives.lua")
-dofile(minetest.get_modpath("worldedit") .. "/visualization.lua")
-dofile(minetest.get_modpath("worldedit") .. "/serialization.lua")
+local path = minetest.get_modpath("worldedit")
+dofile(path .. "/manipulations.lua")
+dofile(path .. "/primitives.lua")
+dofile(path .. "/visualization.lua")
+dofile(path .. "/serialization.lua")
+dofile(path .. "/code.lua")

worldedit_commands/init.lua

@@ -169,7 +169,7 @@ minetest.register_chatcommand("/set", {
 
 minetest.register_chatcommand("/replace", {
 	params = "<search node> <replace node>",
-	description = "Replace all instances of <search node> with <place node> in the current WorldEdit region",
+	description = "Replace all instances of <search node> with <replace node> in the current WorldEdit region",
 	privs = {worldedit=true},
 	func = function(name, param)
 		local pos1, pos2 = worldedit.pos1[name], worldedit.pos2[name]
@@ -197,6 +197,27 @@ minetest.register_chatcommand("/replace", {
 	end,
 })
 
+minetest.register_chatcommand("/homogenize", {
+	params = "<node>",
+	description = "Replace all non-air nodes with <node> in the current WorldEdit region",
+	privs = {worldedit=true},
+	func = function(name, param)
+		local pos1, pos2 = worldedit.pos1[name], worldedit.pos2[name]
+		if pos1 == nil or pos2 == nil then
+			minetest.chat_send_player(name, "No WorldEdit region selected")
+			return
+		end
+
+		if not worldedit.node_is_valid(param) then
+			minetest.chat_send_player(name, "Invalid node name: " .. param)
+			return
+		end
+
+		local count = worldedit.homogenize(pos1, pos2, param)
+		minetest.chat_send_player(name, count .. " nodes homogenized")
+	end,
+})
+
 minetest.register_chatcommand("/hollowsphere", {
 	params = "<radius> <node>",
 	description = "Add hollow sphere at WorldEdit position 1 with radius <radius>, composed of <node>",
@@ -811,9 +832,43 @@ minetest.register_chatcommand("/metaload", {
 		end
 		local count, err = worldedit.metaload(pos1, param)
 		if err then
-			minetest.chat_send_player(name, "error loading file: " .. err)
+			minetest.chat_send_player(name, "Error loading file: " .. err)
 		else
 			minetest.chat_send_player(name, count .. " nodes loaded")
 		end
 	end,
 })
+
+minetest.register_chatcommand("/lua", {
+	params = "<code>",
+	description = "Executes <code> as a Lua chunk in the global namespace",
+	privs = {worldedit=true},
+	func = function(name, param)
+		local err = worldedit.lua(param)
+		if err then
+			minetest.chat_send_player(name, "Code error: " .. err)
+		else
+			minetest.chat_send_player(name, "Code successfully executed")
+		end
+	end,
+})
+
+minetest.register_chatcommand("/luatransform", {
+	params = "<code>",
+	description = "Executes <code> as a Lua chunk in the global namespace with the variable pos available, for each node in the current WorldEdit region",
+	privs = {worldedit=true},
+	func = function(name, param)
+		local pos1, pos2 = worldedit.pos1[name], worldedit.pos2[name]
+		if pos1 == nil or pos2 == nil then
+			minetest.chat_send_player(name, "No WorldEdit region selected")
+			return
+		end
+
+		local err = worldedit.luatransform(pos1, pos2, param)
+		if err then
+			minetest.chat_send_player(name, "Code error: " .. err)
+		else
+			minetest.chat_send_player(name, "Code successfully executed")
+		end
+	end,
+})