From 09ef071c8128555d97abe8cbbca7a84b95091fb8 Mon Sep 17 00:00:00 2001
From: Gael-de-Sailly <gael.chretien@akeonet.com>
Date: Fri, 30 Jan 2015 14:32:51 +0100
Subject: [PATCH] Fixed sand replacing non-buildable-to nodes on place

---
 minetestforfun_game/mods/default/nodes.lua | 78 ++++++++--------------
 1 file changed, 27 insertions(+), 51 deletions(-)

diff --git a/minetestforfun_game/mods/default/nodes.lua b/minetestforfun_game/mods/default/nodes.lua
index 105c5d8b..5e275a3a 100644
--- a/minetestforfun_game/mods/default/nodes.lua
+++ b/minetestforfun_game/mods/default/nodes.lua
@@ -273,6 +273,30 @@ minetest.register_abm({
 	end
 })
 
+local function sand_on_place(itemstack, placer, pointed_thing)
+	if not pointed_thing.type == "node" then
+		return itemstack
+	end
+	local pn = placer:get_player_name()
+	if minetest.is_protected(pointed_thing.above, pn) then
+		return itemstack
+	end
+	local node = minetest.get_node(pointed_thing.above)
+	local def = minetest.registered_nodes[node.name]
+	if def and def.buildable_to then
+		minetest.add_node(pointed_thing.above, {name=itemstack:get_name()})
+		local meta = minetest.get_meta(pointed_thing.above)
+		meta:set_string("owner", pn)
+		nodeupdate(pointed_thing.above)
+		if not minetest.setting_getbool("creative_mode") then
+			itemstack:take_item()
+		end
+		return itemstack
+	else
+		return itemstack
+	end
+end
+
 minetest.register_node("default:sand", {
 	description = "Sand",
 	tiles = {"default_sand.png"},
@@ -284,23 +308,7 @@ minetest.register_node("default:sand", {
 	},
 	groups = {crumbly = 3, falling_node = 1, sand = 1},
 	sounds = default.node_sound_sand_defaults(),
-	on_place = function(itemstack, placer, pointed_thing)
-     		if not pointed_thing.type == "node" then
-			return itemstack
-		end
-		local pn = placer:get_player_name()
-		if minetest.is_protected(pointed_thing.above, pn) then
-			return itemstack
-		end
-		minetest.add_node(pointed_thing.above, {name=itemstack:get_name()})
-		local meta = minetest.get_meta(pointed_thing.above)
-		meta:set_string("owner", pn)
-		nodeupdate(pointed_thing.above)
-		if not minetest.setting_getbool("creative_mode") then
-				itemstack:take_item()
-		end
-		return itemstack
-	end
+	on_place = sand_on_place
 })
 
 minetest.register_node("default:desert_sand", {
@@ -314,23 +322,7 @@ minetest.register_node("default:desert_sand", {
 	},
 	groups = {crumbly = 3, falling_node = 1, sand = 1},
 	sounds = default.node_sound_sand_defaults(),
-	on_place = function(itemstack, placer, pointed_thing)
-     		if not pointed_thing.type == "node" then
-			return itemstack
-		end
-		local pn = placer:get_player_name()
-		if minetest.is_protected(pointed_thing.above, pn) then
-			return itemstack
-		end
-		minetest.add_node(pointed_thing.above, {name=itemstack:get_name()})
-		local meta = minetest.get_meta(pointed_thing.above)
-		meta:set_string("owner", pn)
-		nodeupdate(pointed_thing.above)
-		if not minetest.setting_getbool("creative_mode") then
-				itemstack:take_item()
-		end
-		return itemstack
-	end
+	on_place = sand_on_place
 })
 
 minetest.register_node("default:gravel", {
@@ -344,23 +336,7 @@ minetest.register_node("default:gravel", {
 		},
 	},
 	sounds = default.node_sound_gravel_defaults(),
-	on_place = function(itemstack, placer, pointed_thing)
-     		if not pointed_thing.type == "node" then
-			return itemstack
-		end
-		local pn = placer:get_player_name()
-		if minetest.is_protected(pointed_thing.above, pn) then
-			return itemstack
-		end
-		minetest.add_node(pointed_thing.above, {name=itemstack:get_name()})
-		local meta = minetest.get_meta(pointed_thing.above)
-		meta:set_string("owner", pn)
-		nodeupdate(pointed_thing.above)
-		if not minetest.setting_getbool("creative_mode") then
-				itemstack:take_item()
-		end
-		return itemstack
-	end
+	on_place = sand_on_place
 })
 
 minetest.register_node("default:sandstone", {