Add .luacheckrc and fix issues it pointed out (#589)

.github/workflows/check-release.yml

@@ -0,0 +1,15 @@
+on: [push, pull_request]
+name: Check & Release
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@main
+    - name: apt
+      run: sudo apt-get install -y luarocks
+    - name: luacheck install
+      run: luarocks install --local luacheck
+    - name: luacheck run
+      run: $HOME/.luarocks/bin/luacheck ./

.luacheckrc

@@ -0,0 +1,36 @@
+std = "lua51c"
+
+ignore = {
+	"21/_+", -- Unused variable, except "_", "__", etc.
+	"213", -- Unused loop variable
+	"421", -- Shadowing a local variable
+	"422", -- Shadowing an argument
+	"423", -- Shadowing a loop variable
+	"431", -- Shadowing an upvalue
+	"432", -- Shadowing an upvalue argument
+	"433", -- Shadowing an upvalue loop variable
+	"542", -- Empty if branch
+}
+
+max_line_length = 200
+
+read_globals = {
+	"default",
+	"digiline",
+	"doors",
+	"dump",
+	"jit",
+	"minetest",
+	"screwdriver",
+	"string.split",
+	"table.copy",
+	"table.insert_all",
+	"vector",
+	"VoxelArea",
+}
+
+globals = {"mesecon"}
+
+files["mesecons/actionqueue.lua"] = {
+	globals = {"minetest.registered_globalsteps"},
+}

mesecons/actionqueue.lua

@@ -29,7 +29,7 @@ local queue = mesecon.queue
 queue.actions = {} -- contains all ActionQueue actions
 
 function queue:add_function(name, func)
-	queue.funcs[name] = func
+	self.funcs[name] = func
 end
 
 -- If add_action with twice the same overwritecheck and same position are called, the first one is overwritten
@@ -51,17 +51,17 @@ function queue:add_action(pos, func, params, time, overwritecheck, priority)
 
 	 -- check if old action has to be overwritten / removed:
 	if overwritecheck then
-		for i, ac in ipairs(queue.actions) do
+		for i, ac in ipairs(self.actions) do
 			if vector.equals(pos, ac.pos)
 					and mesecon.cmpAny(overwritecheck, ac.owcheck) then
 				-- remove the old action
-				table.remove(queue.actions, i)
+				table.remove(self.actions, i)
 				break
 			end
 		end
 	end
 
-	table.insert(queue.actions, action)
+	table.insert(self.actions, action)
 end
 
 -- execute the stored functions on a globalstep
@@ -133,8 +133,8 @@ end
 function queue:execute(action)
 	-- ignore if action queue function name doesn't exist,
 	-- (e.g. in case the action queue savegame was written by an old mesecons version)
-	if queue.funcs[action.func] then
+	if self.funcs[action.func] then
-		queue.funcs[action.func](action.pos, unpack(action.params))
+		self.funcs[action.func](action.pos, unpack(action.params))
 	end
 end
 

mesecons/internal.lua

@@ -318,7 +318,7 @@ function mesecon.get_conductor_on(node_off, rulename)
 			return conductor.states[tonumber(binstate,2)+1]
 		end
 	end
-	return offstate
+	return nil
 end
 
 function mesecon.get_conductor_off(node_on, rulename)
@@ -334,7 +334,7 @@ function mesecon.get_conductor_off(node_on, rulename)
 			return conductor.states[tonumber(binstate,2)+1]
 		end
 	end
-	return onstate
+	return nil
 end
 
 function mesecon.conductor_get_rules(node)

mesecons/legacy.lua

@@ -11,4 +11,4 @@ local old_forceloaded_blocks = mesecon.file2table("mesecon_forceloaded")
 for hash, _ in pairs(old_forceloaded_blocks) do
 	minetest.forceload_free_block(unhash_blockpos(hash))
 end
-os.remove(minetest.get_worldpath()..DIR_DELIM.."mesecon_forceloaded")
+os.remove(minetest.get_worldpath().."/mesecon_forceloaded")

mesecons/oldwires.lua

@@ -11,7 +11,7 @@ minetest.register_node("mesecons:mesecon_off", {
 		fixed = {-0.5, -0.5, -0.5, 0.5, -0.45, 0.5},
 	},
 	groups = {dig_immediate=3, mesecon=1, mesecon_conductor_craftable=1},
-    	description="Mesecons",
+	description="Mesecons",
 	mesecons = {conductor={
 		state = mesecon.state.off,
 		onstate = "mesecons:mesecon_on"

mesecons/services.lua

@@ -63,7 +63,7 @@ mesecon.on_dignode = function(pos, node)
 	mesecon.execute_autoconnect_hooks_queue(pos, node)
 end
 
-function mesecon.on_blastnode(pos, intensity)
+function mesecon.on_blastnode(pos)
 	local node = minetest.get_node(pos)
 	minetest.remove_node(pos)
 	mesecon.on_dignode(pos, node)

mesecons/util.lua

@@ -286,7 +286,7 @@ end
 -- File writing / reading utilities
 local wpath = minetest.get_worldpath()
 function mesecon.file2table(filename)
-	local f = io.open(wpath..DIR_DELIM..filename, "r")
+	local f = io.open(wpath.."/"..filename, "r")
 	if f == nil then return {} end
 	local t = f:read("*all")
 	f:close()
@@ -295,7 +295,7 @@ function mesecon.file2table(filename)
 end
 
 function mesecon.table2file(filename, table)
-	local f = io.open(wpath..DIR_DELIM..filename, "w")
+	local f = io.open(wpath.."/"..filename, "w")
 	f:write(minetest.serialize(table))
 	f:close()
 end
@@ -376,7 +376,7 @@ function mesecon.vm_get_node(pos)
 	local tbl = vm_get_or_create_entry(pos)
 	local index = tbl.va:indexp(pos)
 	local node_value = tbl.data[index]
-	if node_value == core.CONTENT_IGNORE then
+	if node_value == minetest.CONTENT_IGNORE then
 		return nil
 	else
 		local node_param1 = tbl.param1[index]

mesecons_blinkyplant/init.lua

@@ -32,7 +32,7 @@ mesecon.register_node("mesecons_blinkyplant:blinky_plant", {
 		fixed = {-0.3, -0.5, -0.3, 0.3, -0.5+0.7, 0.3},
 	},
 	on_timer = on_timer,
-	on_rightclick = function(pos, node, clicker)
+	on_rightclick = function(pos, _, clicker)
 		if minetest.is_protected(pos, clicker and clicker:get_player_name() or "") then
 			return
 		end

mesecons_commandblock/init.lua

@@ -79,7 +79,7 @@ local function after_place(pos, placer)
 	end
 end
 
-local function receive_fields(pos, formname, fields, sender)
+local function receive_fields(pos, _, fields, sender)
 	if not fields.submit then
 		return
 	end

mesecons_detector/init.lua

@@ -12,7 +12,7 @@ local function object_detector_make_formspec(pos)
 		"button_exit[7,0.75;2,3;;Save]")
 end
 
-local function object_detector_on_receive_fields(pos, formname, fields, sender)
+local function object_detector_on_receive_fields(pos, _, fields, sender)
 	if not fields.scanname or not fields.digiline_channel then return end
 
 	if minetest.is_protected(pos, sender:get_player_name()) then return end
@@ -53,7 +53,7 @@ end
 -- set player name when receiving a digiline signal on a specific channel
 local object_detector_digiline = {
 	effector = {
-		action = function(pos, node, channel, msg)
+		action = function(pos, _, channel, msg)
 			local meta = minetest.get_meta(pos)
 			if channel == meta:get_string("digiline_channel") then
 				meta:set_string("scanname", msg)
@@ -156,7 +156,7 @@ local function node_detector_make_formspec(pos)
 		"button_exit[7,0.75;2,3;;Save]")
 end
 
-local function node_detector_on_receive_fields(pos, fieldname, fields, sender)
+local function node_detector_on_receive_fields(pos, _, fields, sender)
 	if not fields.scanname or not fields.digiline_channel then return end
 
 	if minetest.is_protected(pos, sender:get_player_name()) then return end
@@ -238,23 +238,6 @@ local node_detector_digiline = {
 	receptor = {}
 }
 
-local function after_place_node_detector(pos, placer)
-	local placer_pos = placer:get_pos()
-	if not placer_pos then
-		return
-	end
-
-	--correct for the player's height
-	if placer:is_player() then
-		placer_pos.y = placer_pos.y + 1.625
-	end
-
-	--correct for 6d facedir
-	local node = minetest.get_node(pos)
-	node.param2 = minetest.dir_to_facedir(vector.subtract(pos, placer_pos), true)
-	minetest.set_node(pos, node)
-end
-
 minetest.register_node("mesecons_detector:node_detector_off", {
 	tiles = {"default_steel_block.png", "default_steel_block.png", "default_steel_block.png", "default_steel_block.png", "default_steel_block.png", "jeija_node_detector_off.png"},
 	paramtype = "light",

mesecons_doors/init.lua

@@ -22,11 +22,11 @@ end
 local function meseconify_door(name)
 	if minetest.registered_items[name .. "_b_1"] then
 		-- old style double-node doors
-		local function toggle_state1 (pos, node)
+		local function toggle_state1 (pos)
 			on_rightclick(pos, 1, name.."_t_1", name.."_b_2", name.."_t_2", {1,2,3,0})
 		end
 
-		local function toggle_state2 (pos, node)
+		local function toggle_state2 (pos)
 			on_rightclick(pos, 1, name.."_t_2", name.."_b_1", name.."_t_1", {3,0,1,2})
 		end
 
@@ -49,13 +49,13 @@ local function meseconify_door(name)
 		-- new style mesh node based doors
 		local override = {
 			mesecons = {effector = {
-				action_on = function(pos, node)
+				action_on = function(pos)
 					local door = doors.get(pos)
 					if door then
 						door:open()
 					end
 				end,
-				action_off = function(pos, node)
+				action_off = function(pos)
 					local door = doors.get(pos)
 					if door then
 						door:close()
@@ -93,13 +93,13 @@ end
 if doors and doors.get then
 	local override = {
 		mesecons = {effector = {
-			action_on = function(pos, node)
+			action_on = function(pos)
 				local door = doors.get(pos)
 				if door then
 					door:open()
 				end
 			end,
-			action_off = function(pos, node)
+			action_off = function(pos)
 				local door = doors.get(pos)
 				if door then
 					door:close()

mesecons_extrawires/crossover.lua

@@ -1,15 +1,13 @@
-local function crossover_get_rules(node)
+local crossover_rules = {
-	return {
+	{--first wire
-		{--first wire
+		{x=-1,y=0,z=0},
-			{x=-1,y=0,z=0},
+		{x=1,y=0,z=0},
-			{x=1,y=0,z=0},
+	},
-		},
+	{--second wire
-		{--second wire
+		{x=0,y=0,z=-1},
-			{x=0,y=0,z=-1},
+		{x=0,y=0,z=1},
-			{x=0,y=0,z=1},
+	},
-		},
+}
-	}
-end
 
 local crossover_states = {
 	"mesecons_extrawires:crossover_off",
@@ -38,7 +36,7 @@ minetest.register_node("mesecons_extrawires:crossover_off", {
 	mesecons = {
 		conductor = {
 			states = crossover_states,
-			rules = crossover_get_rules(),
+			rules = crossover_rules,
 		}
 	},
 	on_blast = mesecon.on_blastnode,
@@ -65,7 +63,7 @@ minetest.register_node("mesecons_extrawires:crossover_01", {
 	mesecons = {
 		conductor = {
 			states = crossover_states,
-			rules = crossover_get_rules(),
+			rules = crossover_rules,
 		}
 	},
 	on_blast = mesecon.on_blastnode,
@@ -92,7 +90,7 @@ minetest.register_node("mesecons_extrawires:crossover_10", {
 	mesecons = {
 		conductor = {
 			states = crossover_states,
-			rules = crossover_get_rules(),
+			rules = crossover_rules,
 		}
 	},
 	on_blast = mesecon.on_blastnode,
@@ -119,7 +117,7 @@ minetest.register_node("mesecons_extrawires:crossover_on", {
 	mesecons = {
 		conductor = {
 			states = crossover_states,
-			rules = crossover_get_rules(),
+			rules = crossover_rules,
 		}
 	},
 	on_blast = mesecon.on_blastnode,

mesecons_extrawires/vertical.lua

@@ -69,7 +69,7 @@ local vertical_updatepos = function (pos)
 	end
 end
 
-local vertical_update = function (pos, node)
+local vertical_update = function (pos)
 	vertical_updatepos(pos) -- this one
 	vertical_updatepos(vector.add(pos, vertical_rules[1])) -- above
 	vertical_updatepos(vector.add(pos, vertical_rules[2])) -- below

mesecons_fpga/init.lua

@@ -96,7 +96,7 @@ plg.register_nodes({
 		meta:set_int("valid", 0)
 		meta:set_string("infotext", "FPGA")
 	end,
-	on_rightclick = function(pos, node, clicker)
+	on_rightclick = function(pos, _, clicker)
 		if not minetest.is_player(clicker) then
 			return
 		end
@@ -113,7 +113,7 @@ plg.register_nodes({
 	mesecons = {
 		effector = {
 			rules = {}, -- replaced later
-			action_change = function(pos, node, rule, newstate)
+			action_change = function(pos, _, rule, newstate)
 				plg.ports_changed(pos, rule, newstate)
 				plg.update(pos)
 			end
@@ -129,7 +129,7 @@ plg.register_nodes({
 		end
 	end,
 	on_blast = mesecon.on_blastnode,
-	on_rotate = function(pos, node, user, mode)
+	on_rotate = function(pos, _, user, mode)
 		local abcd1 = {"A", "B", "C", "D"}
 		local abcd2 = {A = 1, B = 2, C = 3, D = 4}
 		local ops = {"op1", "op2", "dst"}

mesecons_fpga/logic.lua

@@ -10,10 +10,10 @@ local operations = {
 	-- unary:   Whether this gate only has one input
 	{ gate = "and",  short = "&", fs_name = " AND", func = function(a, b) return a and b end },
 	{ gate = "or",   short = "|", fs_name = "  OR", func = function(a, b) return a or b end },
-	{ gate = "not",  short = "~", fs_name = " NOT", func = function(a, b) return not b end, unary = true },
+	{ gate = "not",  short = "~", fs_name = " NOT", func = function(_, b) return not b end, unary = true },
 	{ gate = "xor",  short = "^", fs_name = " XOR", func = function(a, b) return a ~= b end },
 	{ gate = "nand", short = "?", fs_name = "NAND", func = function(a, b) return not (a and b) end },
-	{ gate = "buf",  short = "_", fs_name = "   =", func = function(a, b) return b end, unary = true },
+	{ gate = "buf",  short = "_", fs_name = "   =", func = function(_, b) return b end, unary = true },
 	{ gate = "xnor", short = "=", fs_name = "XNOR", func = function(a, b) return a == b end },
 	{ gate = "nor",  short = "!", fs_name = " NOR", func = function(a, b) return not (a or b) end },
 }

mesecons_gates/init.lua

@@ -65,7 +65,6 @@ end
 local function register_gate(name, inputnumber, assess, recipe, description)
 	local get_inputrules = inputnumber == 2 and gate_get_input_rules_twoinputs or
 		gate_get_input_rules_oneinput
-	description = "Logic Gate: "..name
 
 	local basename = "mesecons_gates:"..name
 	mesecon.register_node(basename, {

mesecons_hydroturbine/init.lua

@@ -72,7 +72,7 @@ minetest.register_abm({
 nodenames = {"mesecons_hydroturbine:hydro_turbine_off"},
 	interval = 1,
 	chance = 1,
-	action = function(pos, node, active_object_count, active_object_count_wider)
+	action = function(pos)
 		local waterpos={x=pos.x, y=pos.y+1, z=pos.z}
 		if is_flowing_water(waterpos) then
 			minetest.set_node(pos, {name="mesecons_hydroturbine:hydro_turbine_on"})
@@ -85,7 +85,7 @@ minetest.register_abm({
 nodenames = {"mesecons_hydroturbine:hydro_turbine_on"},
 	interval = 1,
 	chance = 1,
-	action = function(pos, node, active_object_count, active_object_count_wider)
+	action = function(pos)
 		local waterpos={x=pos.x, y=pos.y+1, z=pos.z}
 		if not is_flowing_water(waterpos) then
 			minetest.set_node(pos, {name="mesecons_hydroturbine:hydro_turbine_off"})

mesecons_luacontroller/init.lua

@@ -60,7 +60,7 @@ local function update_real_port_states(pos, rule_name, new_state)
 	if rule_name.x == nil then
 		for _, rname in ipairs(rule_name) do
 			local port = pos_to_side[rname.x + (2 * rname.z) + 3]
-			L[port] = (newstate == "on") and 1 or 0
+			L[port] = (new_state == "on") and 1 or 0
 		end
 	else
 		local port = pos_to_side[rule_name.x + (2 * rule_name.z) + 3]
@@ -172,7 +172,7 @@ local function burn_controller(pos)
 	minetest.after(0.2, mesecon.receptor_off, pos, mesecon.rules.flat)
 end
 
-local function overheat(pos, meta)
+local function overheat(pos)
 	if mesecon.do_overheat(pos) then -- If too hot
 		burn_controller(pos)
 		return true
@@ -612,9 +612,8 @@ local function run_inner(pos, code, event)
 	if overheat(pos) then return true, "" end
 	if ignore_event(event, meta) then return true, "" end
 
-	-- Load code & mem from meta
+	-- Load mem from meta
 	local mem  = load_memory(meta)
-	local code = meta:get_string("code")
 
 	-- 'Last warning' label.
 	local warning = ""
@@ -626,15 +625,17 @@ local function run_inner(pos, code, event)
 	local itbl = {}
 	local env = create_environment(pos, mem, event, itbl, send_warning)
 
+	local success, msg
 	-- Create the sandbox and execute code
-	local f, msg = create_sandbox(code, env)
+	local f
+	f, msg = create_sandbox(code, env)
 	if not f then return false, msg end
 	-- Start string true sandboxing
 	local onetruestring = getmetatable("")
 	-- If a string sandbox is already up yet inconsistent, something is very wrong
 	assert(onetruestring.__index == string)
 	onetruestring.__index = env.string
-	local success, msg = pcall(f)
+	success, msg = pcall(f)
 	onetruestring.__index = string
 	-- End string true sandboxing
 	if not success then return false, msg end
@@ -748,7 +749,7 @@ local selection_box = {
 local digiline = {
 	receptor = {},
 	effector = {
-		action = function(pos, node, channel, msg)
+		action = function(pos, _, channel, msg)
 			msg = clean_and_weigh_digiline_message(msg)
 			run(pos, {type = "digiline", channel = channel, msg = msg})
 		end
@@ -766,7 +767,7 @@ local function set_program(pos, code)
 	return run(pos, {type="program"})
 end
 
-local function on_receive_fields(pos, form_name, fields, sender)
+local function on_receive_fields(pos, _, fields, sender)
 	if not fields.program then
 		return
 	end
@@ -871,7 +872,7 @@ for d = 0, 1 do
 			c = c == 1,
 			d = d == 1,
 		},
-		after_dig_node = function (pos, node)
+		after_dig_node = function (pos)
 			mesecon.do_cooldown(pos)
 			mesecon.receptor_off(pos, output_rules)
 		end,

mesecons_materials/init.lua

@@ -2,13 +2,13 @@
 minetest.register_craftitem("mesecons_materials:glue", {
 	image = "mesecons_glue.png",
 	on_place_on_ground = minetest.craftitem_place_item,
-    	description="Glue",
+	description="Glue",
 })
 
 minetest.register_craftitem("mesecons_materials:fiber", {
 	image = "mesecons_fiber.png",
 	on_place_on_ground = minetest.craftitem_place_item,
-    	description="Fiber",
+	description="Fiber",
 })
 
 minetest.register_craft({
@@ -29,7 +29,7 @@ minetest.register_craft({
 minetest.register_craftitem("mesecons_materials:silicon", {
 	image = "mesecons_silicon.png",
 	on_place_on_ground = minetest.craftitem_place_item,
-    	description="Silicon",
+	description="Silicon",
 })
 
 minetest.register_craft({

mesecons_microcontroller/init.lua

@@ -102,7 +102,7 @@ minetest.register_node(nodename, {
 		for i=1, EEPROM_SIZE+1 do r=r.."0" end --Generate a string with EEPROM_SIZE*"0"
 		meta:set_string("eeprom", r)
 	end,
-	on_receive_fields = function(pos, formanme, fields, sender)
+	on_receive_fields = function(pos, _, fields, sender)
 		local player_name = sender:get_player_name()
 		if minetest.is_protected(pos, player_name) and
 				not minetest.check_player_privs(player_name, {protection_bypass=true}) then
@@ -225,7 +225,6 @@ yc.parsecode = function(code, pos)
 	local Lreal = yc.get_real_portstates(pos)
 	local Lvirtual = yc.get_virtual_portstates(pos)
 	if Lvirtual == nil then return nil end
-	local c
 	local eeprom = meta:get_string("eeprom")
 	while true do
 		local command, params
@@ -251,9 +250,9 @@ yc.parsecode = function(code, pos)
 			if not params then return nil end
 		end
 		if command == "on" then
-			L = yc.command_on (params, Lvirtual)
+			Lvirtual = yc.command_on (params, Lvirtual)
 		elseif command == "off" then
-			L = yc.command_off(params, Lvirtual)
+			Lvirtual = yc.command_off(params, Lvirtual)
 		elseif command == "print" then
 			local su = yc.command_print(params, eeprom, yc.merge_portstates(Lreal, Lvirtual))
 			if su ~= true then return nil end
@@ -384,7 +383,6 @@ end
 
 --Commands
 yc.command_on = function(params, L)
-	local rules = {}
 	for i, port in ipairs(params) do
 		L = yc.set_portstate (port, true, L)
 	end
@@ -392,7 +390,6 @@ yc.command_on = function(params, L)
 end
 
 yc.command_off = function(params, L)
-	local rules = {}
 	for i, port in ipairs(params) do
 		L = yc.set_portstate (port, false, L)
 	end
@@ -405,7 +402,7 @@ yc.command_print = function(params, eeprom, L)
 		if param:sub(1,1) == '"' and param:sub(#param, #param) == '"' then
 			s = s..param:sub(2, #param-1)
 		else
-			r = yc.command_parsecondition(param, L, eeprom)
+			local r = yc.command_parsecondition(param, L, eeprom)
 			if r == "1" or r == "0" then
 				s = s..r
 			else return nil end
@@ -469,8 +466,8 @@ yc.command_after_execute = function(params)
 		if yc.parsecode(params.code, params.pos) == nil then
 			meta:set_string("infotext", "Code in after() not valid!")
 		else
-			if code ~= nil then
+			if params.code ~= nil then
-				meta:set_string("infotext", "Working Microcontroller\n"..code)
+				meta:set_string("infotext", "Working Microcontroller\n"..params.code)
 			else
 				meta:set_string("infotext", "Working Microcontroller")
 			end
@@ -543,8 +540,8 @@ yc.command_parsecondition = function(cond, L, eeprom)
 	cond = string.gsub(cond, "!0", "1")
 	cond = string.gsub(cond, "!1", "0")
 
-	local i = 2
+	i = 2
-	local l = string.len(cond)
+	l = string.len(cond)
 	while i<=l do
 		local s = cond:sub(i,i)
 		local b = tonumber(cond:sub(i-1, i-1))
@@ -553,8 +550,7 @@ yc.command_parsecondition = function(cond, L, eeprom)
 		if s == "=" then
 			if a==nil then return nil end
 			if b==nil then return nil end
-			if a == b  then buf = "1" end
+			local buf = a == b and "1" or "0"
-			if a ~= b then buf = "0" end
 			cond = string.gsub(cond, b..s..a, buf)
 			i = 1
 			l = string.len(cond)
@@ -562,8 +558,8 @@ yc.command_parsecondition = function(cond, L, eeprom)
 		i = i + 1
 	end
 
-	local i = 2
+	i = 2
-	local l = string.len(cond)
+	l = string.len(cond)
 	while i<=l do
 		local s = cond:sub(i,i)
 		local b = tonumber(cond:sub(i-1, i-1))
@@ -659,7 +655,7 @@ yc.set_portstate = function(port, state, L)
 	return L
 end
 
-yc.update_real_portstates = function(pos, node, rulename, newstate)
+yc.update_real_portstates = function(pos, _, rulename, newstate)
 	local meta = minetest.get_meta(pos)
 	if rulename == nil then
 		meta:set_int("real_portstates", 1)
@@ -696,7 +692,7 @@ end
 
 yc.get_virtual_portstates = function(pos) -- portstates according to the name
 	local name = minetest.get_node(pos).name
-	local b, a = string.find(name, ":microcontroller")
+	local _, a = string.find(name, ":microcontroller")
 	if a == nil then return nil end
 	a = a + 1
 

mesecons_movestones/init.lua

@@ -71,7 +71,7 @@ function mesecon.register_movestone(name, def, is_sticky, is_vertical)
 		-- ### Step 3: If sticky, pull stack behind ###
 		if is_sticky then
 			local backpos = vector.subtract(pos, direction)
-			success, stack, oldstack = mesecon.mvps_pull_all(backpos, direction, max_pull, owner)
+			local success, _, oldstack = mesecon.mvps_pull_all(backpos, direction, max_pull, owner)
 			if success then
 				mesecon.mvps_move_objects(backpos, vector.multiply(direction, -1), oldstack, -1)
 			end
@@ -94,7 +94,7 @@ function mesecon.register_movestone(name, def, is_sticky, is_vertical)
 
 	def.after_place_node = mesecon.mvps_set_owner
 
-	def.on_punch = function(pos, node, player)
+	def.on_punch = function(pos, _, player)
 		local player_name = player and player.get_player_name and player:get_player_name()
 		if mesecon.mvps_claim(pos, player_name) then
 			minetest.get_node_timer(pos):start(timer_interval)
@@ -102,7 +102,7 @@ function mesecon.register_movestone(name, def, is_sticky, is_vertical)
 		end
 	end
 
-	def.on_timer = function(pos, elapsed)
+	def.on_timer = function(pos)
 		local sourcepos = mesecon.is_powered(pos)
 		if not sourcepos then
 			return

mesecons_mvps/init.lua

@@ -271,7 +271,6 @@ function mesecon.mvps_push_or_pull(pos, stackdir, movedir, maximum, all_pull_sti
 end
 
 function mesecon.mvps_move_objects(pos, dir, nodestack, movefactor)
-	local objects_to_move = {}
 	local dir_k
 	local dir_l
 	for k, v in pairs(dir) do

mesecons_pistons/init.lua

@@ -107,7 +107,7 @@ local function piston_off(pos, node)
 	local dir = minetest.facedir_to_dir(node.param2)
 	local pullpos = vector.add(pos, vector.multiply(dir, -2))
 	local meta = minetest.get_meta(pos)
-	local success, stack, oldstack = mesecon.mvps_pull_single(pullpos, dir, max_pull, meta:get_string("owner"))
+	local success, _, oldstack = mesecon.mvps_pull_single(pullpos, dir, max_pull, meta:get_string("owner"))
 	if success then
 		mesecon.mvps_move_objects(pullpos, vector.multiply(dir, -1), oldstack, -1)
 	end
@@ -234,7 +234,7 @@ local function piston_rotate_pusher(pos, node, player, mode)
 	return piston_rotate_on(piston_pos, piston_node, player, mode)
 end
 
-local function piston_punch(pos, node, player)
+local function piston_punch(pos, _, player)
 	local player_name = player and player.get_player_name and player:get_player_name()
 	if mesecon.mvps_claim(pos, player_name) then
 		minetest.chat_send_player(player_name, "Reclaimed piston")
@@ -422,7 +422,7 @@ minetest.register_node("mesecons_pistons:piston_pusher_sticky", {
 
 
 -- Register pushers as stoppers if they would be seperated from the piston
-local function piston_pusher_get_stopper(node, dir, stack, stackid)
+local function piston_pusher_get_stopper(node, _, stack, stackid)
 	if (stack[stackid + 1]
 	and stack[stackid + 1].node.name   == get_pistonspec(node.name, "pusher").onname
 	and stack[stackid + 1].node.param2 == node.param2)
@@ -434,32 +434,12 @@ local function piston_pusher_get_stopper(node, dir, stack, stackid)
 	return true
 end
 
-local function piston_pusher_up_down_get_stopper(node, dir, stack, stackid)
-	if (stack[stackid + 1]
-	and stack[stackid + 1].node.name   == get_pistonspec(node.name, "pusher").onname)
-	or (stack[stackid - 1]
-	and stack[stackid - 1].node.name   == get_pistonspec(node.name, "pusher").onname) then
-		return false
-	end
-	return true
-end
-
 mesecon.register_mvps_stopper("mesecons_pistons:piston_pusher_normal", piston_pusher_get_stopper)
 mesecon.register_mvps_stopper("mesecons_pistons:piston_pusher_sticky", piston_pusher_get_stopper)
 
 
 -- Register pistons as stoppers if they would be seperated from the stopper
-local piston_up_down_get_stopper = function (node, dir, stack, stackid)
+local function piston_get_stopper(node, _, stack, stackid)
-	if (stack[stackid + 1]
-	and stack[stackid + 1].node.name   == get_pistonspec(node.name, "onname").pusher)
-	or (stack[stackid - 1]
-	and stack[stackid - 1].node.name   == get_pistonspec(node.name, "onname").pusher) then
-		return false
-	end
-	return true
-end
-
-local function piston_get_stopper(node, dir, stack, stackid)
 	local pistonspec = get_pistonspec(node.name, "onname")
 	local dir = vector.multiply(minetest.facedir_to_dir(node.param2), -1)
 	local pusherpos = vector.add(stack[stackid].pos, dir)
@@ -499,4 +479,4 @@ minetest.register_craft({
 
 
 -- load legacy code
-dofile(minetest.get_modpath("mesecons_pistons")..DIR_DELIM.."legacy.lua")
+dofile(minetest.get_modpath("mesecons_pistons").."/legacy.lua")

mesecons_powerplant/init.lua

@@ -11,7 +11,7 @@ minetest.register_node("mesecons_powerplant:power_plant", {
 	walkable = false,
 	groups = {dig_immediate=3, mesecon = 2},
 	light_source = minetest.LIGHT_MAX-9,
-    	description="Power Plant",
+	description="Power Plant",
 	selection_box = {
 		type = "fixed",
 		fixed = {-0.3, -0.5, -0.3, 0.3, -0.5+0.7, 0.3},

mesecons_pressureplates/init.lua

@@ -8,7 +8,7 @@ local pp_box_on = {
 	fixed = { -7/16, -8/16, -7/16, 7/16, -7.5/16, 7/16 },
 }
 
-local function pp_on_timer(pos, elapsed)
+local function pp_on_timer(pos)
 	local node = minetest.get_node(pos)
 	local basename = minetest.registered_nodes[node.name].pressureplate_basename
 
@@ -17,7 +17,6 @@ local function pp_on_timer(pos, elapsed)
 	if not basename then return end
 
 	local objs   = minetest.get_objects_inside_radius(pos, 1)
-	local two_below = vector.add(pos, vector.new(0, -2, 0))
 
 	if objs[1] == nil and node.name == basename .. "_on" then
 		minetest.set_node(pos, {name = basename .. "_off"})
@@ -46,7 +45,6 @@ end
 -- sounds:	sound table
 
 function mesecon.register_pressure_plate(basename, description, textures_off, textures_on, image_w, image_i, recipe, groups, sounds)
-	local groups_off, groups_on
 	if not groups then
 		groups = {}
 	end

mesecons_random/init.lua

@@ -59,7 +59,7 @@ minetest.register_node("mesecons_random:ghoststone_active", {
 	}},
 	on_construct = function(pos)
 		-- remove shadow
-		shadowpos = vector.add(pos, vector.new(0, 1, 0))
+		local shadowpos = vector.add(pos, vector.new(0, 1, 0))
 		if (minetest.get_node(shadowpos).name == "air") then
 			minetest.dig_node(shadowpos)
 		end

mesecons_receiver/init.lua

@@ -47,7 +47,7 @@ mesecon.register_node("mesecons_receiver:receiver", {
 	walkable = false,
 	on_rotate = false,
 	selection_box = {
-             	type = "fixed",
+		type = "fixed",
 		fixed = { -3/16, -8/16, -8/16, 3/16, 3/16, 8/16 }
 	},
 	node_box = {
@@ -96,7 +96,7 @@ mesecon.register_node("mesecons_receiver:receiver_up", {
 	walkable = false,
 	on_rotate = false,
 	selection_box = {
-             	type = "fixed",
+		type = "fixed",
 		fixed = up_rcvboxes
 	},
 	node_box = {
@@ -141,7 +141,7 @@ mesecon.register_node("mesecons_receiver:receiver_down", {
 	walkable = false,
 	on_rotate = false,
 	selection_box = {
-             	type = "fixed",
+		type = "fixed",
 		fixed = down_rcvboxes
 	},
 	node_box = {

mesecons_stickyblocks/init.lua

@@ -8,7 +8,7 @@ minetest.register_node("mesecons_stickyblocks:sticky_block_all", {
 	tiles = {"mesecons_stickyblocks_sticky.png"},
 	is_ground_content = false,
 	groups = {choppy=3, oddly_breakable_by_hand=2},
-	mvps_sticky = function (pos, node)
+	mvps_sticky = function (pos)
 		local connected = {}
 		for _, r in ipairs(mesecon.rules.alldirs) do
 			table.insert(connected, vector.add(pos, r))

mesecons_wires/init.lua

@@ -14,7 +14,7 @@ local wire_getconnect = function (from_pos, self_pos)
 	if minetest.registered_nodes[node.name]
 	and minetest.registered_nodes[node.name].mesecons then
 		-- rules of node to possibly connect to
-		local rules = {}
+		local rules
 		if (minetest.registered_nodes[node.name].mesecon_wire) then
 			rules = mesecon.rules.default
 		else
@@ -73,7 +73,7 @@ local update_on_place_dig = function (pos, node)
 	end
 
 	-- Update nodes around it
-	local rules = {}
+	local rules
 	if minetest.registered_nodes[node.name]
 	and minetest.registered_nodes[node.name].mesecon_wire then
 		rules = mesecon.rules.default