Module:IfEmpty

This module implements the functionality of Template:IfEmpty. It returns the first template argument that's not empty or whitespace-only.

---

local getArgs = require('Module:Arguments').getArgs
local p = {}

function p.main(frame)
	-- Important to use removeBlanks = false here, because otherwise a blank
	-- positional arg will be turned into nil, and Lua's ipairs() stops when a 
	-- value is nil, so you won't be able to iterate over the rest of the 
	-- positional args.
	local args = getArgs(frame, { 
		wrappers = 'Template:IfEmpty',
		removeBlanks = false,
	})
	for i, v in ipairs(args) do
		if v ~= '' then
			return v
		end
	end
end

return p