From 711d9fe88df965e7f90a8999b131c623019780cc Mon Sep 17 00:00:00 2001
From: Jean-Patrick Guerrero <jeanpatrick.guerrero@gmail.com>
Date: Thu, 11 Feb 2016 21:43:00 +0100
Subject: [PATCH] Use string.sub wherever possible

---
 nodes.lua     | 2 +-
 worktable.lua | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/nodes.lua b/nodes.lua
index 53537c4..38da8e2 100644
--- a/nodes.lua
+++ b/nodes.lua
@@ -179,7 +179,7 @@ xdecor.register("cushion_block", {
 })
 
 local function door_access(door)
-	return door:find("prison")
+	return door:sub(1,6) == "prison"
 end
 
 local door_types = {
diff --git a/worktable.lua b/worktable.lua
index 6f3a86b..d189e70 100644
--- a/worktable.lua
+++ b/worktable.lua
@@ -59,8 +59,8 @@ worktable.nodebox_blender = {
 }
 
 function worktable:get_recipe(item)
-	if item:find("^group:") then
-		if item:find("wool$") or item:find("dye$") then
+	if item:sub(1,6) == "group:" then
+		if item:sub(-4) == "wool" or item:sub(-3) == "dye" then
 			item = item:sub(7)..":white"
 		elseif minetest.registered_items["default:"..item:sub(7)] then
 			item = item:gsub("group:", "default:")
@@ -125,7 +125,7 @@ function worktable:craftguide_formspec(meta, pagenum, item, recipe_num, filter)
 		local rows = math.ceil(table.maxn(items) / width) -- Lua 5.3 removed `table.maxn`, use `xdecor.maxn` in case of failure.
 
 		local function is_group(item)
-			if item:find("^group:") then return "\nG" end
+			if item:sub(1,6) == "group:" then return "\nG" end
 			return ""
 		end