//overlay: Don't place nodes above water

Fixes #38

CHANGELOG.md

@@ -5,6 +5,7 @@ It's about time I started a changelog! This will serve from now on as the main c
 ## v1.12 (unreleased)
  - Add `//srect` (_select rectangle_) - thanks, @VorTechnix!
  - Add `//spush`, `//spop`, and `//sstack`
+ - `//overlay`: Don't place nodes above water
 
 
 ## v1.11: The big data update (25th January 2021)

worldeditadditions/lib/overlay.lua

@@ -23,32 +23,38 @@ function worldeditadditions.overlay(pos1, pos2, node_weights)
 		for x = pos2.x, pos1.x, -1 do
 			local found_air = false
 			local placed_node = false
-			
+			-- print("\n\n[overlay] ****** column start ******")
 			for y = pos2.y, pos1.y, -1 do
 				local i = area:index(x, y, z)
+				-- print("[overlay] pos", x, y, z, "id", data[i], "name", minetest.get_name_from_content_id(data[i]), "is_liquid", worldeditadditions.is_liquidlike(data[i]))
 				
 				local is_air = worldeditadditions.is_airlike(data[i])
+				local is_liquid = worldeditadditions.is_liquidlike(data[i])
 				-- wielded_light is now handled by worldeditadditions.is_airlike
 				
 				local is_ignore = data[i] == node_id_ignore
 				
 				if not is_air and not is_ignore then
-					if found_air then
+					local i_above = area:index(x, y + 1, z)
+					if found_air and not is_liquid then
 						local new_id = node_ids[math.random(node_ids_count)]
 						-- We've found an air block previously, so it must be above us
 						-- Replace the node above us with the target block
-						data[area:index(x, y + 1, z)] = new_id
+						data[i_above] = new_id
 						changes.updated = changes.updated + 1
 						placed_node = true
 						if not changes.placed[new_id] then
 							changes.placed[new_id] = 0
 						end
 						changes.placed[new_id] = changes.placed[new_id] + 1
+						-- print("[overlay] placed above ", x, y, z)
 						break -- Move on to the next column
 					end
-				elseif not is_ignore then
+				elseif not is_ignore and not is_liquid then
+					-- print("[overlay] found air at", x, y, z)
 					found_air = true
 				end
+				if is_liquid then found_air = false end
 			end
 			
 			if not placed_node then

worldeditadditions/utils/node_identification.lua

@@ -44,7 +44,7 @@ function worldeditadditions.is_liquidlike(id)
 	if node_name == nil or not minetest.registered_nodes[node_name] then return false end
 	
 	local liquidtype = minetest.registered_nodes[node_name].liquidtype
-	-- print("[is_liquidlike]", "id", id, "liquidtype", liquidtype)
+	-- print("[is_liquidlike]", "id", id, "name", node_name, "liquidtype", liquidtype)
 	
 	if liquidtype == nil or liquidtype == "none" then return false end
 	-- If it's not none, then it has to be a liquid as the only other values are source and flowing