/**
 * Selectionner de preference la feuille .less (en la compilant)
 * et sinon garder la .css classiquement
 *
 * @param string $css_file
 * @return string
 */
function lesscss_select_css($css_file){
	if (function_exists('less_css')
	  AND substr($css_file,-4)==".css"){
		$less_file = substr($css_file,0,-4).".less";
		$less_or_css = lesscss_find_less_or_css_in_path($less_file, $css_file);
		if (substr($less_or_css,-5)==".less")
			return less_css($less_or_css);
		else
			return $less_or_css;
	}
	return find_in_path($css_file);
}