-- Copyright 2011-2014, Gianluca Fiore © <forod.g@gmail.com>

--- Function equivalent to dirname in POSIX systems
--@param str the path string
function dirname(str)
	if str:match(".-/.-") then
		local name = string.gsub(str, "(.*/)(.*)", "%1")
		return name
	else
		return ''
	end
end