Module:Category series navigation/navyear/sandbox

local p = {}

function p.navyear(frame)
	--Expects a PAGENAME of the form "Some sequential 2015 example cat", where {{{1}}}=Some sequential, {{{2}}}=2015, {{{3}}}=example cat, 
	--TODO: and an optional 'minumum year' parameter {{{4}}}=1758
	local arg1 = frame.args[1]
	local arg2 = tonumber(frame.args[2])
	local arg3 = frame.args[3]
	local navyear = '{| class="toccolours hlist" style="text-align: center; margin: auto;"\n' .. '|\n'

	local i = -5
	while i <= 5 do
		local year = arg2 + i
		if i ~= 0 then
			navyear = navyear..'*'..frame:expandTemplate{ title = 'LinkCatIfExists2', args = { arg1..' '..year..' '..arg3, year } }..'\n'
		else
			navyear = navyear..'*<b>'..arg2..'</b>\n'
		end
		i = i + 1
	end
	return navyear..'|}'
end

return p