From dc7aea71ee7db3deb1f6672cbe2f6d3a07efe549 Mon Sep 17 00:00:00 2001
From: Pierre-Yves Rollo <dev@pyrollo.com>
Date: Thu, 3 Dec 2015 15:43:39 +0100
Subject: [PATCH] Check existence of material before registering stele

---
 steles/nodes.lua | 91 +++++++++++++++++++++++++-----------------------
 1 file changed, 47 insertions(+), 44 deletions(-)

diff --git a/steles/nodes.lua b/steles/nodes.lua
index ce80382..c71606d 100644
--- a/steles/nodes.lua
+++ b/steles/nodes.lua
@@ -14,52 +14,55 @@ display_lib.register_display_entity("steles:text")
 for _, material in ipairs(steles.materials) do
 
 	local ndef = minetest.registered_nodes[material]
-	local parts = material:split(":")
 
-	minetest.register_node("steles:"..parts[2].."_stele", {
-		description = ndef.description.." Stele",
-		sunlight_propagates = true,
-		paramtype = "light",
-		paramtype2 = "facedir",
-		tiles = ndef.tiles, 
-		drawtype = "nodebox",
-		node_box = {
-			type = "fixed", 
-			fixed = {
-				{-5/16, -4/16, -2/16, 5/16, 0.5, 2/16},
-				{-7/16, -0.5, -4/16, 7/16, -4/16, 4/16}
-			}
-		},
-		groups = ndef.groups,
-		display_entities = { 
-			["steles:text"] = {
-					on_display_update = font_lib.on_display_update,
-					depth = -2/16-0.001, height = 2/16,
-					size = { x = 14/16, y = 12/16 },
-					resolution = { x = 144, y = 64 },
-					maxlines = 3, 
+	if ndef then
+		local parts = material:split(":")
+
+		minetest.register_node("steles:"..parts[2].."_stele", {
+			description = ndef.description.." Stele",
+			sunlight_propagates = true,
+			paramtype = "light",
+			paramtype2 = "facedir",
+			tiles = ndef.tiles,
+			drawtype = "nodebox",
+			node_box = {
+				type = "fixed",
+				fixed = {
+					{-5/16, -4/16, -2/16, 5/16, 0.5, 2/16},
+					{-7/16, -0.5, -4/16, 7/16, -4/16, 4/16}
+				}
 			},
-		},
-		on_place = display_lib.on_place,
-		on_construct = 	function(pos)
-							local meta = minetest.get_meta(pos)
-							meta:set_string("formspec", "size[6,4]"..
-								"textarea[0.5,0.7;5.5,2;display_text;Displayed text (3 lines max);${display_text}]"..
-								"button_exit[2,3;2,1;ok;Write]")
-							display_lib.on_construct(pos)
-						end,
-		on_destruct = display_lib.on_destruct,
-		on_rotate = display_lib.on_rotate,
-		on_receive_fields = function(pos, formname, fields, player)
-								if not minetest.is_protected(pos, player:get_player_name()) then
-									local meta = minetest.get_meta(pos)
-									if fields and fields.ok then
-										meta:set_string("display_text", fields.display_text)
-										meta:set_string("infotext", "\""..fields.display_text.."\"")
-										display_lib.update_entities(pos)
-									end
-								end
+			groups = ndef.groups,
+			display_entities = {
+				["steles:text"] = {
+						on_display_update = font_lib.on_display_update,
+						depth = -2/16-0.001, height = 2/16,
+						size = { x = 14/16, y = 12/16 },
+						resolution = { x = 144, y = 64 },
+						maxlines = 3,
+				},
+			},
+			on_place = display_lib.on_place,
+			on_construct = 	function(pos)
+								local meta = minetest.get_meta(pos)
+								meta:set_string("formspec", "size[6,4]"..
+									"textarea[0.5,0.7;5.5,2;display_text;Displayed text (3 lines max);${display_text}]"..
+									"button_exit[2,3;2,1;ok;Write]")
+								display_lib.on_construct(pos)
 							end,
-	})
+			on_destruct = display_lib.on_destruct,
+			on_rotate = display_lib.on_rotate,
+			on_receive_fields = function(pos, formname, fields, player)
+									if not minetest.is_protected(pos, player:get_player_name()) then
+										local meta = minetest.get_meta(pos)
+										if fields and fields.ok then
+											meta:set_string("display_text", fields.display_text)
+											meta:set_string("infotext", "\""..fields.display_text.."\"")
+											display_lib.update_entities(pos)
+										end
+									end
+								end,
+		})
+	end
 end