Module:Main page image

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

function p.width(frame)
	local args = getArgs(frame)
	return p._width(args)
end

function p._width(args)
	local new_width = 140
	local page = mw.title.makeTitle('File', args[1] or '')
	if not page or not page.fileExists then
		return new_width
	end

	new_width = math.floor(140 * math.sqrt(page.file.width / page.file.height) + 0.5)

	return new_width
end

return p
Usage
