Allow to bulk-set param2 of regions

WorldEdit API.md

@@ -27,6 +27,12 @@ Sets a region defined by positions `pos1` and `pos2` to `node_name`. To clear a
 
 Returns the number of nodes set.
 
+### `count = worldedit.set_param2(pos1, pos2, param2)`
+
+Sets the param2 values of all nodes in a region defined by positions `pos1` and `pos2` to `param2`.
+
+Returns the number of nodes set.
+
 ### count = worldedit.replace(pos1, pos2, searchnode, replacenode)
 
 Replaces all instances of `searchnode` with `replacenode` in a region defined by positions `pos1` and `pos2`.

worldedit/manipulations.lua

@@ -38,6 +38,29 @@ function worldedit.set(pos1, pos2, node_names)
 	return worldedit.volume(pos1, pos2)
 end
 
+--- Sets param2 of a region.
+-- @param pos1
+-- @param pos2
+-- @param param2 Value of param2 to set
+-- @return The number of nodes set.
+function worldedit.set_param2(pos1, pos2, param2)
+	pos1, pos2 = worldedit.sort_pos(pos1, pos2)
+
+	local manip, area = mh.init(pos1, pos2)
+	local param2_data = {}
+
+	-- Set param2 for every node
+	for i in area:iterp(pos1, pos2) do
+		param2_data[i] = param2
+	end
+
+	-- Update map
+	manip:set_param2_data(param2_data)
+	manip:write_to_map()
+	manip:update_map()
+
+	return worldedit.volume(pos1, pos2)
+end
 
 --- Replaces all instances of `search_node` with `replace_node` in a region.
 -- When `inverse` is `true`, replaces all instances that are NOT `search_node`.

worldedit_commands/init.lua

@@ -387,6 +387,25 @@ minetest.register_chatcommand("/set", {
 	end, check_region),
 })
 
+minetest.register_chatcommand("/param2", {
+	params = "<param2>",
+	description = "Set param2 of all nodes in the current WorldEdit region to <param2>",
+	privs = {worldedit=true},
+	func = safe_region(function(name, param)
+		local param2 = tonumber(param)
+		if not param2 then
+			worldedit.player_notify(name, "Invalid or missing param2 argument")
+			return
+		elseif param2 < 0 or param2 > 255 then
+			worldedit.player_notify(name, "Param2 is out of range (must be between 0 and 255 inclusive)!")
+			return
+		end
+
+		local count = worldedit.set_param2(worldedit.pos1[name], worldedit.pos2[name], param2)
+		worldedit.player_notify(name, count .. " nodes set")
+	end, check_region),
+})
+
 minetest.register_chatcommand("/mix", {
 	params = "<node1> ...",
 	description = "Fill the current WorldEdit region with a random mix of <node1>, ...",