Module:Mourning

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local p = {}

local function parseDeathDate(raw)
	if not raw or raw == "" then
		return nil
	end

	local m, d = raw:match("{{%s*[Dd]eath date and age%s*|%s*%d+%s*|%s*(%d+)%s*|%s*(%d+)")
	if m and d then
		return tonumber(m), tonumber(d)
	end

	m, d = raw:match("{{%s*[Dd]eath date%s*|%s*%d+%s*|%s*(%d+)%s*|%s*(%d+)")
	if m and d then
		return tonumber(m), tonumber(d)
	end

	return nil
end

function p.main(frame)
	local rawDeathDate = frame.args.death_date

	local month, day = parseDeathDate(rawDeathDate)
	if not month or not day then
		return ""
	end

	local utcNow = os.date("!*t")

	if month == utcNow.month and day == utcNow.day then
		return frame:expandTemplate{
			title = 'Top icon',
			args = {
				imagename = 'Black Ribbon.svg',
				description = 'This person died on this day.',
				id = 'z'
			}
		}
	end

	return ""
end

return p