[LuaCheck]: Various changes and improvements (#65)

* Add GitHub workflow
* Fix LuaCheck warnings
* Add build status badge on README.md

.github/workflows/build.yml

@@ -0,0 +1,11 @@
+on: [push, pull_request]
+name: build
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: lint
+        uses: Roang-zero1/factorio-mod-luacheck@master
+        with:
+          luacheckrc_url: ""

.luacheckrc

@@ -7,6 +7,7 @@ read_globals = {
 	"pipeworks",
 	"dump",
 	"VoxelArea",
+	"ItemStack",
 }
 
 globals = {

README.md

@@ -1,6 +1,8 @@
 Digilines
 ==========
 
+[![Build status](https://github.com/minetest-mods/digilines/workflows/build/badge.svg)](https://github.com/minetest-mods/digilines/actions)
+
 - The minetest counterpart for bus systems like i2c, SPI, RS232, USB -
 - Minetest 5.0.0+ is required to use this mod.
 

internal.lua

@@ -92,7 +92,7 @@ function digilines.transmit(pos, channel, msg, checked)
 		return
 	end
 	checked[checkedID] = true
-	
+
 	digilines.vm_begin()
 	local queue = queue_new()
 	queue_enqueue(queue, pos)
@@ -112,9 +112,9 @@ function digilines.transmit(pos, channel, msg, checked)
 				for _, rule in ipairs(rules) do
 					local nextPos = digilines.addPosRule(curPos, rule)
 					if digilines.rules_link(curPos, nextPos) then
-						local checkedID = minetest.hash_node_position(nextPos)
+						local checkedID2 = minetest.hash_node_position(nextPos)
-						if not checked[checkedID] then
+						if not checked[checkedID2] then
-							checked[checkedID] = true
+							checked[checkedID2] = true
 							queue_enqueue(queue, nextPos)
 						end
 					end

inventory.lua

@@ -229,7 +229,7 @@ minetest.register_node("digilines:chest", {
 		last_inventory_take_index = index
 		return stack:get_count()
 	end,
-	on_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
+	on_metadata_inventory_move = function(pos, _, from_index, _, to_index, count, player)
 		-- See what would happen if we were to move the items back from in the
 		-- opposite direction. In the event of a normal move, this must
 		-- succeed, because a normal move subtracts some items from the from

lcd.lua

@@ -240,7 +240,7 @@ local prepare_writing = function(pos)
 	if entity then
 		set_texture(entity)
 		rotate_text(pos)
-	end	
+	end
 end
 
 local spawn_entity = function(pos)
@@ -292,12 +292,12 @@ minetest.register_node("digilines:lcd", {
 	end,
 	on_construct = reset_meta,
 	on_destruct = clearscreen,
-	on_punch = function(pos, node, puncher, pointed_thing)
+	on_punch = function(pos, _, puncher, _)
 		if minetest.is_player(puncher) then
 			spawn_entity(pos)
 		end
 	end,
-	on_rotate = function(pos, node, user, mode, new_param2)
+	on_rotate = function(pos, _, _, mode, new_param2)
 		if mode ~= screwdriver.ROTATE_FACE then
 			return false
 		end
@@ -340,7 +340,10 @@ minetest.register_craft({
 	output = "digilines:lcd 2",
 	recipe = {
 		{"default:steel_ingot", "digilines:wire_std_00000000", "default:steel_ingot"},
-		{"mesecons_lightstone:lightstone_green_off","mesecons_lightstone:lightstone_green_off","mesecons_lightstone:lightstone_green_off"},
+		{"mesecons_lightstone:lightstone_green_off",
+		"mesecons_lightstone:lightstone_green_off",
+		"mesecons_lightstone:lightstone_green_off"},
+
 		{"default:glass","default:glass","default:glass"}
 	}
 })