7 pub fn arg_expand(arg: String) -> Result<Vec<String>, Error> {
8 if arg.starts_with("@") {
10 let file = match fs::read_to_string(path) {
12 Err(ref err) if err.kind() == io::ErrorKind::InvalidData => {
13 return Err(Error::Utf8Error(Some(path.to_string())));
15 Err(err) => return Err(Error::IOError(path.to_string(), err)),
17 Ok(file.lines().map(ToString::to_string).collect())
25 Utf8Error(Option<String>),
26 IOError(String, io::Error),
29 impl fmt::Display for Error {
30 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
32 Error::Utf8Error(None) => write!(fmt, "Utf8 error"),
33 Error::Utf8Error(Some(path)) => write!(fmt, "Utf8 error in {}", path),
34 Error::IOError(path, err) => write!(fmt, "IO Error: {}: {}", path, err),
39 impl error::Error for Error {
40 fn description(&self) -> &'static str {