Fix //stack2 not working (closes #94)

Author: sfan5

WorldEdit API.md

@@ -45,6 +45,12 @@ Copies the region defined by positions `pos1` and `pos2` along the `axis` axis (
 
 Returns the number of nodes copied.
 
+### count = worldedit.copy2(pos1, pos2, off)
+
+Copies the region defined by positions `pos1` and `pos2` by the offset vector `off`.
+
+Returns the number of nodes copied.
+
 ### count = worldedit.move(pos1, pos2, axis, amount)
 
 Moves the region defined by positions `pos1` and `pos2` along the `axis` axis ("x" or "y" or "z") by `amount` nodes.

worldedit/manipulations.lua

@@ -90,7 +90,7 @@ function worldedit.stack2(pos1, pos2, direction, amount, finished)
 			translated.x = translated.x + direction.x
 			translated.y = translated.y + direction.y
 			translated.z = translated.z + direction.z
-			worldedit.copy2(pos1, pos2, translated, volume)
+			worldedit.copy2(pos1, pos2, translated)
 			minetest.after(0, next_one)
 		else
 			if finished then
@@ -164,6 +164,38 @@ function worldedit.copy(pos1, pos2, axis, amount)
 	return worldedit.volume(pos1, pos2)
 end
 
+--- Copies a region by offset vector `off`.
+-- @param pos1
+-- @param pos2
+-- @param off
+-- @return The number of nodes copied.
+function worldedit.copy2(pos1, pos2, off)
+	local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
+
+	worldedit.keep_loaded(pos1, pos2)
+
+	local get_node, get_meta, set_node = minetest.get_node,
+			minetest.get_meta, minetest.set_node
+	local pos = {}
+	pos.x = pos2.x
+	while pos.x >= pos1.x do
+		pos.y = pos2.y
+		while pos.y >= pos1.y do
+			pos.z = pos2.z
+			while pos.z >= pos1.z do
+				local node = get_node(pos) -- Obtain current node
+				local meta = get_meta(pos):to_table() -- Get meta of current node
+				local newpos = vector.add(pos, off) -- Calculate new position
+				set_node(newpos, node) -- Copy node to new position
+				get_meta(newpos):from_table(meta) -- Set metadata of new node
+				pos.z = pos.z - 1
+			end
+			pos.y = pos.y - 1
+		end
+		pos.x = pos.x - 1
+	end
+	return worldedit.volume(pos1, pos2)
+end
 
 --- Moves a region along `axis` by `amount` nodes.
 -- @return The number of nodes moved.