improve warnin message

rm -rf default - electric boogaloo

README.md

@@ -0,0 +1,30 @@
+# Basic Materials mod
+
+mod that adds basic material nodes and items
+
+## Install
+
+### Option 1: use content tab in minetest
+
+* click the content tab
+* search for basic materials
+* click install on basic materials
+
+### Option 2: download from [ContentDB](https://content.minetest.net/packages/VanessaE/basic_materials/)
+
+* click the above link or search for basic materials on ContentDB
+* select the download button on the basic materials page
+* extract the zip downloaded from the previous step
+* place in your mods folder
+
+### Option 3: use git
+
+* `git clone https://github.com/mt-mods/basic_materials.git`
+* `cd basic_materials`
+* `git submodule init`
+* `git submodule update`
+
+to update please use the following commands starting inside the mod directory
+
+* `git submodule sync`
+* `git submodule update`

nodes.lua

@@ -1,7 +1,27 @@
 local S = minetest.get_translator("basic_materials")
-local sound_api = dofile(basic_materials.modpath .. "/sound_api_core/init.lua")
 local chains_sbox = {type = "fixed",fixed = { -0.1, -0.5, -0.1, 0.1, 0.5, 0.1 }}
 
+local sound_api = loadfile(basic_materials.modpath .. "/sound_api_core/init.lua")
+if not sound_api then
+	sound_api = {}
+	local metatable = {
+		__index = function(_, _)
+			return function(input)
+				minetest.log(
+					"warning",
+					"[basic_materials]: " ..
+					"The sound api submodule for game agnostic sound loading could not be found at " ..
+					basic_materials.modpath .. "/sound_api_core. " ..
+					"documentation for using submodules can be found at https://git-scm.com/docs/git-submodule." ..
+					"defaulting back to mod provided input or nil."
+				)
+				if input then return input else return nil end
+			end
+		end,
+	}
+	setmetatable(sound_api, metatable)
+end
+
 minetest.register_node("basic_materials:cement_block", {
 	description = S("Cement"),
 	tiles = {"basic_materials_cement_block.png"},