Module:TFA title

local p = {}

local data = mw.loadJsonData("Template:TFA title/data.json")

-- Internal, today's date as YYYY-MM-DD
local function today()
	return os.date("%Y-%m-%d")
end

-- Get the TFA title for the specified "YYYY-MM-DD" date. May be
-- a single title, an array of multiple titles, or nil, if no title is known
function p.title(date)
	return data.titles[date] or nil
end

-- Today's TFA, see title() for possible return values
function p.today_title()
	return p.title(today())
end

-- Is the specified title the TFA today?
-- Returns "yes" or "", for use with {{#if:}}
function p.is_todays_tfa(frame)
	return p.is_tfa_on(frame.args[1], today())
end

-- Is the specified title the TFA on the specified date?
-- Returns "yes" or "", for use with {{#if:}}
function p.is_tfa_on(title, date)
	local days_title = p.title(date)
	if days_title == nil then
		-- no clue
		return ""
	end
	if type(days_title) == "string" then
		if title == days_title then
			return "yes"
		else
			return ""
		end
	end

	-- table case, multiple titles
	for _, check in pairs( days_title ) do
		if check == title then
			return "yes"
		end
	end
	return ""
end

return p
Usage
