Function MatchesExtension

src/fileio.cpp:1051–1058

* Helper to see whether a given filename matches the extension. * @param extension The extension to look for. * @param filename The filename to look in for the extension. * @return True iff the extension is nullptr, or the filename ends with it. */

 * @return True iff the extension is nullptr, or the filename ends with it.
 */
static bool MatchesExtension(std::string_view extension, const std::string &filename)
{
	if (extension.empty()) return true;
	if (filename.length() < extension.length()) return false;

	std::string_view filename_sv = filename; // String view to avoid making another copy of the substring.
	return StrCompareIgnoreCase(extension, filename_sv.substr(filename_sv.length() - extension.length())) == 0;
}

/**
 * Scan a single directory (and recursively its children) and add