Function looks_like_pathspec

setup.c:232–260

* Check for arguments that don't resolve as actual files, * but which look sufficiently like pathspecs that we'll consider * them such for the purposes of rev/pathspec DWIM parsing. */

 * them such for the purposes of rev/pathspec DWIM parsing.
 */
static int looks_like_pathspec(const char *arg)
{
	const char *p;
	int escaped = 0;

	/*
	 * Wildcard characters imply the user is looking to match pathspecs
	 * that aren't in the filesystem. Note that this doesn't include
	 * backslash even though it's a glob special; by itself it doesn't
	 * cause any increase in the match. Likewise ignore backslash-escaped
	 * wildcard characters.
	 */
	for (p = arg; *p; p++) {
		if (escaped) {
			escaped = 0;
		} else if (is_glob_special(*p)) {
			if (*p == '\\')
				escaped = 1;
			else
				return 1;
		}
	}

	/* long-form pathspec magic */
	if (starts_with(arg, ":("))
		return 1;

	return 0;
}

/*
 * Verify a filename that we got as an argument for a pathspec