selection: Improve message shown to players

CHANGELOG.md

@@ -43,6 +43,7 @@ Note to self: See the bottom of this file for the release template text.
      - Fix crash if no arguments are specified
      - Fix automatic seed when generating many mazes in the same second (e.g. with `//for`, `//many`)
  - `//convolve`: Fix those super tall pillars appearing randomly
+ - cloud wand: improve feedback messages sent to players
 
 
 ## v1.12: The selection tools update (26th June 2021)

worldeditadditions/lib/selection/selection.lua

@@ -13,6 +13,7 @@ local selection = {}
 -- @param	pos	vector	The position to include.
 function selection.add_point(name, pos)
 	if pos ~= nil then
+		local created_new = not worldedit.pos1[name] or not worldedit.pos2[name]
 		-- print("[set_pos1]", name, "("..pos.x..", "..pos.y..", "..pos.z..")")
 		if not worldedit.pos1[name] then worldedit.pos1[name] = vector.new(pos) end
 		if not worldedit.pos2[name] then worldedit.pos2[name] = vector.new(pos) end
@@ -26,9 +27,17 @@ function selection.add_point(name, pos)
 		local volume_after = worldedit.volume(worldedit.pos1[name], worldedit.pos2[name])
 		
 		local volume_difference = volume_after - volume_before
+		if volume_difference == 0 and created_new then
+			volume_difference = 1
+		end
+		
+		local msg = "Expanded region by "
+		if created_new then msg = "Created new region with " end
+		msg = msg..volume_difference.." node"
+		if volume_difference ~= 1 then msg = msg.."s" end
 		
 		worldedit.marker_update(name)
-		worldedit.player_notify(name, "Expanded region by "..volume_difference.." nodes")
+		worldedit.player_notify(name, msg)
 	else
 		worldedit.player_notify(name, "Error: Too far away (try raising your maxdist with //farwand maxdist <number>)")
 		-- print("[set_pos1]", name, "nil")