Tweak the Luacheck configuration file and fix many warnings

.luacheckrc

@@ -1,14 +1,35 @@
+std = "lua51+minetest"
 unused_args = false
 allow_defined_top = true
+max_line_length = 999
 
-read_globals = {
-	"DIR_DELIM",
-	"minetest", "core",
-	"dump",
-	"vector", "nodeupdate",
-	"VoxelManip", "VoxelArea",
-	"PseudoRandom", "ItemStack",
-	"intllib",
-	"default",
+stds.minetest = {
+	read_globals = {
+		"DIR_DELIM",
+		"minetest",
+		"core",
+		"dump",
+		"vector",
+		"nodeupdate",
+		"VoxelManip",
+		"VoxelArea",
+		"PseudoRandom",
+		"ItemStack",
+		"default",
+		table = {
+			fields = {
+				"copy",
+			},
+		},
+	}
 }
 
+read_globals = {
+	"intllib",
+	"protector",
+	"isprotect",
+	"IsPlayerNodeOwner",
+	"HasOwner",
+	"getLastOwner",
+	"GetNodeOwnerName",
+}

stairsplus/custom.lua

@@ -5,8 +5,6 @@ Copyright (c) 2011-2018 Hugo Locurcio and contributors.
 Licensed under the zlib license. See LICENSE.md for more information.
 --]]
 
-local S = moreblocks.intllib
-
 --[[
 Subset table should have the following format: (You can remove entries as needed.)
 
@@ -75,22 +73,22 @@ function register_custom_subset(subset, modname, subname, recipeitem, groups, im
 end
 
 function stairsplus:register_custom_subset_alias(subset, modname_old, subname_old, modname_new, subname_new)
-	local subset = table.copy(subset)
-	for k, v in pairs(subset) do
+	local subset_copy = table.copy(subset)
+	for k, v in pairs(subset_copy) do
 		minetest.register_alias(modname_old .. ":" .. v[1] .. "_" .. subname_old .. v[2], modname_new .. ":" .. v[1] .. "_" .. subname_new .. v[2])
 	end
 end
 
 function stairsplus:register_custom_subset_alias_force(subset, modname_old, subname_old, modname_new, subname_new)
-	local subset = table.copy(subset)
-	for k, v in pairs(subset) do
+	local subset_copy = table.copy(subset)
+	for k, v in pairs(subset_copy) do
 		minetest.register_alias_force(modname_old .. ":" .. v[1] .. "_" .. subname_old .. v[2], modname_new .. ":" .. v[1] .. "_" .. subname_new .. v[2])
 	end
 end
 
 function stairsplus:register_custom_subset(subset, modname, subname, recipeitem, fields)
-	local subset = table.copy(subset)
-	for k, v in pairs(subset) do
+	local subset_copy = table.copy(subset)
+	for k, v in pairs(subset_copy) do
 		stairsplus.register_single(v[1], v[2], stairsplus.defs[v[1]][v[2]], modname, subname, recipeitem, fields)
 	end
 

stairsplus/microblocks.lua

@@ -5,8 +5,6 @@ Copyright (c) 2011-2018 Hugo Locurcio and contributors.
 Licensed under the zlib license. See LICENSE.md for more information.
 --]]
 
-local S = moreblocks.intllib
-
 -- Node will be called <modname>:micro_<subname>
 
 function register_micro(modname, subname, recipeitem, groups, images, description, drop, light)

stairsplus/panels.lua

@@ -5,8 +5,6 @@ Copyright (c) 2011-2018 Hugo Locurcio and contributors.
 Licensed under the zlib license. See LICENSE.md for more information.
 --]]
 
-local S = moreblocks.intllib
-
 -- Node will be called <modname>:panel_<subname>
 
 function register_panel(modname, subname, recipeitem, groups, images, description, drop, light)

stairsplus/slopes.lua

@@ -5,8 +5,6 @@ Copyright (c) 2011-2018 Hugo Locurcio and contributors.
 Licensed under the zlib license. See LICENSE.md for more information.
 --]]
 
-local S = moreblocks.intllib
-
 -- Node will be called <modname>:slope_<subname>
 
 function register_slope(modname, subname, recipeitem, groups, images, description, drop, light)

stairsplus/stairs.lua

@@ -5,8 +5,6 @@ Copyright (c) 2011-2018 Hugo Locurcio and contributors.
 Licensed under the zlib license. See LICENSE.md for more information.
 --]]
 
-local S = moreblocks.intllib
-
 -- Node will be called <modname>:stair_<subname>
 
 function register_stair(modname, subname, recipeitem, groups, images, description, drop, light)