Fix moontest:air not disappearing in vacuum

Edited airgen to generate all air at once.  Changed air ABM to disappear
when next to vacuum, not spread.

mods/moontest/init.lua

@@ -119,36 +119,45 @@ minetest.register_on_dignode(function(pos, oldnode, digger)
 	end
 end)
 
--- Air spreads
+-- Air dies
-
+--this is the hackiest code I've ever written
+-- If neighbors worked as I would like it to, this wouldn't be necessary...
 minetest.register_abm({
 	nodenames = {"moontest:air"},
-	neighbors = {"moontest:vacuum", "air"},
+	neighbors = {"moontest:vacuum"},
-	interval = 11,
+	interval = 1,
-	chance = 9,
+	chance = 1,
 	action = function(pos, node, active_object_count, active_object_count_wider)
-		local spread = minetest.get_meta(pos):get_int("spread")
-		if spread <= 0 then
-			return
-		end
 		local x = pos.x
 		local y = pos.y
 		local z = pos.z
-		for i = -1,1 do
+		--adjacent node positions
-		for j = -1,1 do
+		local left = {x=x-1,y=y,z=z}
-		for k = -1,1 do
+		local right = {x=x+1,y=y,z=z}
-			if not (i == 0 and j == 0 and k == 0) then
+		local up  = {x=x,y=y+1,z=z}
-				local nodename = minetest.get_node({x=x+i,y=y+j,z=z+k}).name
+		local down = {x=x,y=y-1,z=z}
-				if nodename == "moontest:vacuum"
+		local forward = {x=x,y=y,z=z+1}
-				or nodename == "air" then
+		local back = {x=x,y=y,z=z-1}
-					minetest.add_node({x=x+i,y=y+j,z=z+k},{name="moontest:air"})
+		--cross references those for vacuum, spread if true
-					minetest.get_meta({x=x+i,y=y+j,z=z+k}):set_int("spread", (spread - 1))
+		if minetest.get_node(left).name == "moontest:vacuum" then
-					print ("[moontest] MR air spreads "..(spread - 1))
+			minetest.set_node(pos, {name="moontest:vacuum"})
 		end
+		if minetest.get_node(right).name == "moontest:vacuum" then
+			minetest.set_node(pos, {name="moontest:vacuum"})
 		end
+		if minetest.get_node(up).name == "moontest:vacuum" then
+			minetest.set_node(pos, {name="moontest:vacuum"})
 		end
+		if minetest.get_node(down).name == "moontest:vacuum" then
+			minetest.set_node(pos, {name="moontest:vacuum"})
 		end
+		if minetest.get_node(forward).name == "moontest:vacuum" then
+			minetest.set_node(pos, {name="moontest:vacuum"})
 		end
+		if minetest.get_node(back).name == "moontest:vacuum" then
+			minetest.set_node(pos, {name="moontest:vacuum"})
+		end
+		
 	end
 })
 

mods/moontest/nodes.lua

@@ -78,21 +78,38 @@ minetest.register_node("moontest:airgen", {
 		local x = pos.x
 		local y = pos.y
 		local z = pos.z
-		for i = -1,1 do
+		--fire up the voxel manipulator
-		for j = -1,1 do
+		local vm = minetest.get_voxel_manip()
-		for k = -1,1 do
+		local p1 = {x=x-16,y=y-16,z=z-16}
+		local p2 = {x=x+16,y=y+16,z=z+16}
+		pmin, pmax = vm:read_from_map(p1,p2)
+		local area = VoxelArea:new{MinEdge=pmin, MaxEdge=pmax}
+		local data = vm:get_data()
+		
+		local c_vac = minetest.get_content_id("moontest:vacuum")
+		local c_gair = minetest.get_content_id("moontest:air")
+		
+		for i = -16,16 do
+		for j = -16,16 do
+		for k = -16,16 do
 			if not (i == 0 and j == 0 and k == 0) then
-				local nodename = minetest.get_node({x=x+i,y=y+j,z=z+k}).name
+				if i*i+j*j+k*k <= 16 * 16 + 16 then
-				if nodename == "moontest:vacuum" then
+					--grab the location of the node in question
-					minetest.add_node({x=x+i,y=y+j,z=z+k},{name="moontest:air"})
+					local vi = area:index(x+i, y+j, z+k)
-					minetest.get_meta({x=x+i,y=y+j,z=z+k}):set_int("spread", 16)
+					--if it's vacuum, it won't be now!
-					print ("[moontest] Added MR air node")
+					if data[vi] == c_vac then
+						data[vi] = c_gair
+					end
 				end
 			end
 		end
 		end
 		end
 		
+		--write the voxel manipulator data back to world
+		vm:set_data(data)
+		vm:write_to_map(data)
+		vm:update_map()
 	end
 })