add vegan leather recipe

Readme.MD

@@ -7,3 +7,5 @@ inventory.
 The original Bags mod was made by Cornernote and modified to work on sfinv, so
 this mod will work as a direct replacement for Inventory Plus' bags mod and keep
 it's existing bag contents.
+
+Vegan leather can be crafted using mushrooms if no suitable mobs mod is found.

init.lua

@@ -245,6 +245,21 @@ sfinv.register_page("sfinv_bags:bags", {
 	end
 })
 
+-- vegan leather
+minetest.register_craftitem(":bags:leather", {
+	description = S("Vegan Leather"),
+	inventory_image = "bags_leather.png",
+	groups = {leather = 8, flammable = 2},
+})
+
+minetest.register_craft({
+	output = "bags:leather",
+	recipe = {
+		{"group:mushroom", "group:mushroom", "group:mushroom"},
+		{"group:mushroom", "group:mushroom", "group:mushroom"},
+		{"group:mushroom", "", "group:mushroom"}
+	}
+})
 
 -- register bags items
 minetest.register_craftitem(":bags:small", {
@@ -272,36 +287,23 @@ minetest.register_tool(":bags:trolley", {
 })
 
 
--- default craft items
-local item1 = "group:wood"
-local item2 = "group:stick"
-
--- use leather if a mobs mod is found
-if minetest.get_modpath("mobs")
-or minetest.get_modpath("petz")
-or minetest.get_modpath("mesecraft_mobs") then
-	item1 = "group:leather"
-end
-
--- use string if farming found
-if minetest.get_modpath("farming") then
-	item2 = "farming:string"
-end
+-- default craft recipes
+local string = minetest.get_modpath("farming") and "farming:string" or "group:stick"
 
 -- register bag crafts
 minetest.register_craft({
 	output = "bags:small",
 	recipe = {
-		{"", item2, ""},
-		{item1, item1, item1},
-		{item1, item1, item1}
+		{"", string, ""},
+		{"group:leather", "group:leather", "group:leather"},
+		{"group:leather", "group:leather", "group:leather"}
 	}
 })
 
 minetest.register_craft({
 	output = "bags:medium",
 	recipe = {
-		{"", item2, ""},
+		{"", string, ""},
 		{"bags:small", "bags:small", "bags:small"}
 	}
 })
@@ -309,7 +311,7 @@ minetest.register_craft({
 minetest.register_craft({
 	output = "bags:large",
 	recipe = {
-		{"", item2, ""},
+		{"", string, ""},
 		{"bags:medium", "bags:medium", "bags:medium"}
 	}
 })
@@ -317,7 +319,7 @@ minetest.register_craft({
 minetest.register_craft({
 	output = "bags:trolley",
 	recipe = {
-		{"", item2, ""},
+		{"", string, ""},
 		{"bags:large", "bags:large", "bags:large"}
 	}
 })