6 pub fn arg_expand(arg: String) -> Result<Vec<String>, Error> {
7 if let Some(path) = arg.strip_prefix('@') {
8 let file = match fs::read_to_string(path) {
10 Err(ref err) if err.kind() == io::ErrorKind::InvalidData => {
11 return Err(Error::Utf8Error(Some(path.to_string())));
13 Err(err) => return Err(Error::IOError(path.to_string(), err)),
15 Ok(file.lines().map(ToString::to_string).collect())
23 Utf8Error(Option<String>),
24 IOError(String, io::Error),
27 impl fmt::Display for Error {
28 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
30 Error::Utf8Error(None) => write!(fmt, "Utf8 error"),
31 Error::Utf8Error(Some(path)) => write!(fmt, "Utf8 error in {}", path),
32 Error::IOError(path, err) => write!(fmt, "IO Error: {}: {}", path, err),
37 impl error::Error for Error {}