Mòideal:Log globals

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This module is rated as beta, and is ready for widespread use. It is still new and should be used with some caution to ensure the results are as expected.

This module finds nil globals and adds the to the lua log along with where they were read/written. This module is different from [[Mòideal::No globals]] as you can see all nil global variables that are being read/written to rather then only getting an error for the first problematic global variable. The arg variable is excluded.

Faic cuideachd - Also see

[[Mòideal::No globals]] - Creates error message for first encountered nil global read/write

local mt = getmetatable(_G) or {}

local function print(val)
	if type(val) == "table" then
		local printout = {}
		local i = 1
		for k, v in pairs(val) do
			table.insert(printout, ("[%s] = %s"):format(tostring(k), tostring(v)) )
			i = i + 1
			if i > 5 then
				table.insert(printout, "...")
				break
			end
		end
		printout = { table.concat(printout, ", ") }
		table.insert(printout, 1, "{")
		table.insert(printout, "}")
		return table.concat(printout)
	elseif type(val) == "string" then
		return '"' .. val .. '"'
	else
		return tostring(val)
	end
end
		

mt.__newindex = function (self, key, value)
	if key ~= "arg" then
		mw.log("Global variable " .. print(key) .. " was set to "
			.. print(value) .. " somewhere:",
			debug.traceback("", 2))
	end
	return rawset(self, key, value)
end

mt.__index = function (self, key)
	if key ~= "arg" then
		mw.log("Nil global variable " .. print(key) .. " was read somewhere:",
			debug.traceback("", 2))
	end
	return rawget(self, key)
end

setmetatable(_G, mt)