diff --git a/.github/workflows/check-release.yml b/.github/workflows/check-release.yml
new file mode 100644
index 0000000..47313ff
--- /dev/null
+++ b/.github/workflows/check-release.yml
@@ -0,0 +1,11 @@
+on: [push, pull_request]
+name: Check & Release
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: lint
+        uses: Roang-zero1/factorio-mod-luacheck@master
+        with:
+          luacheckrc_url: https://raw.githubusercontent.com/minetest-mods/unified_inventory/master/.luacheckrc
diff --git a/.luacheckrc b/.luacheckrc
new file mode 100644
index 0000000..709c485
--- /dev/null
+++ b/.luacheckrc
@@ -0,0 +1,18 @@
+unused_args = false
+allow_defined_top = true
+max_line_length = 999
+
+globals = {
+	"unified_inventory",
+}
+
+read_globals = {
+	string = {fields = {"split", "trim"}},
+	table = {fields = {"copy", "getn"}},
+
+	"minetest", "vector",
+	"ItemStack", "datastorage",
+}
+
+files["callbacks.lua"].ignore = { "player", "draw_lite_mode" }
+files["bags.lua"].ignore = { "player" }
diff --git a/README.md b/README.md
index be95e09..8c917ec 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # Unified Inventory
 
+[![](https://github.com/minetest-mods/unified_inventory/workflows/Check%20&%20Release/badge.svg)](https://github.com/minetest-mods/unified_inventory/actions)
+
 ![Screenshot](screenshot.png)
 
 Unified Inventory replaces the default survival and creative inventory.
@@ -24,7 +26,6 @@ Unified Inventory replaces the default survival and creative inventory.
 
  * Minetest 5.0.0+
 
-
 # Licenses
 
 Copyright (C) 2012-2014 Maciej Kasatkin (RealBadAngel)
diff --git a/api.lua b/api.lua
index 071900d..d24135b 100644
--- a/api.lua
+++ b/api.lua
@@ -16,8 +16,8 @@ minetest.after(0.01, function()
 			table.insert(unified_inventory.items_list, name)
 			local all_names = rev_aliases[name] or {}
 			table.insert(all_names, name)
-			for _, name in ipairs(all_names) do
-				local recipes = minetest.get_all_craft_recipes(name)
+			for _, player_name in ipairs(all_names) do
+				local recipes = minetest.get_all_craft_recipes(player_name)
 				if recipes then
 					for _, recipe in ipairs(recipes) do
 
diff --git a/bags.lua b/bags.lua
index a365139..c61c982 100644
--- a/bags.lua
+++ b/bags.lua
@@ -1,4 +1,4 @@
---[[ 
+--[[
 Bags for Minetest
 
 Copyright (c) 2012 cornernote, Brett O'Donnell <cornernote@gmail.com>
@@ -166,7 +166,6 @@ local function load_bags_metadata(player, bags_inv)
 end
 
 minetest.register_on_joinplayer(function(player)
-	local player_inv = player:get_inventory()
 	local player_name = player:get_player_name()
 	local bags_inv = minetest.create_detached_inventory(player_name .. "_bags",{
 		on_put = function(inv, listname, index, stack, player)
diff --git a/callbacks.lua b/callbacks.lua
index 8bfe6b6..bc90237 100644
--- a/callbacks.lua
+++ b/callbacks.lua
@@ -28,7 +28,6 @@ minetest.register_on_joinplayer(function(player)
 	-- Refill slot
 	local refill = minetest.create_detached_inventory(player_name.."refill", {
 		allow_put = function(inv, listname, index, stack, player)
-			local player_name = player:get_player_name()
 			if unified_inventory.is_creative(player_name) then
 				return stack:get_count()
 			else
@@ -36,7 +35,6 @@ minetest.register_on_joinplayer(function(player)
 			end
 		end,
 		on_put = function(inv, listname, index, stack, player)
-			local player_name = player:get_player_name()
 			local handle_refill = (minetest.registered_items[stack:get_name()] or {}).on_refill or default_refill
 			stack = handle_refill(stack)
 			inv:set_stack(listname, index, stack)
diff --git a/internal.lua b/internal.lua
index 05dc5f5..ee8b4a9 100644
--- a/internal.lua
+++ b/internal.lua
@@ -215,11 +215,10 @@ function unified_inventory.get_formspec(player, page)
 	else
 		local dir = unified_inventory.active_search_direction[player_name]
 		local list_index = unified_inventory.current_index[player_name]
-		local page = math.floor(list_index / (ui_peruser.items_per_page) + 1)
+		local page2 = math.floor(list_index / (ui_peruser.items_per_page) + 1)
 		local pagemax = math.floor(
 			(#unified_inventory.filtered_items_list[player_name] - 1)
 				/ (ui_peruser.items_per_page) + 1)
-		local item = {}
 		for y = 0, ui_peruser.pagerows - 1 do
 			for x = 0, ui_peruser.pagecols - 1 do
 				local name = unified_inventory.filtered_items_list[player_name][list_index]
@@ -254,7 +253,7 @@ function unified_inventory.get_formspec(player, page)
 			end
 		end
 		formspec[n] = "label[8.2,"..ui_peruser.form_header_y..";"..F(S("Page")) .. ": "
-			.. S("@1 of @2",page,pagemax).."]"
+			.. S("@1 of @2",page2,pagemax).."]"
 	end
 	n= n+1
 
diff --git a/item_names.lua b/item_names.lua
index d374b14..111c9ee 100644
--- a/item_names.lua
+++ b/item_names.lua
@@ -1,6 +1,6 @@
 -- Based on 4itemnames mod by 4aiman
 
-local item_names = {} -- [player_name] = { hud, dtime, itemname } 
+local item_names = {} -- [player_name] = { hud, dtime, itemname }
 local dlimit = 3  -- HUD element will be hidden after this many seconds
 local air_hud_mod = minetest.get_modpath("4air")
 local hud_mod = minetest.get_modpath("hud")