View source for Module:columns/auto

local export = {}

function export.decide_number_of_columns(lang, number_of_items)
	if number_of_items <= 3 then
		return 1
	elseif number_of_items <= 9 then
		return 2
	elseif number_of_items <= 27 then
		return 3
	elseif number_of_items <= 81 then
		return 4
	else
		return 5
	end
end

function export.display_from(column_args, list_args)
	if not column_args["columns"] then
		local m_table = require("Module:table")
		column_args = m_table.shallowcopy(column_args)
		local lang = require("Module:languages").getByCode(mw.text.trim(list_args[1]), 1)
		column_args["columns"] = export.decide_number_of_columns(lang, m_table.length(list_args))
	end
	return require("Module:columns").display_from(column_args, list_args)
end

function export.display(frame)
	return export.display_from(frame.args, frame:getParent().args)
end

return export