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use std::error;
use std::fmt;
use std::fs;
use std::io;
fn arg_expand(arg: String) -> Result<Vec<String>, Error> {
if let Some(path) = arg.strip_prefix('@') {
let file = match fs::read_to_string(path) {
Ok(file) => file,
Err(ref err) if err.kind() == io::ErrorKind::InvalidData => {
return Err(Error::Utf8Error(Some(path.to_string())));
}
Err(err) => return Err(Error::IOError(path.to_string(), err)),
};
Ok(file.lines().map(ToString::to_string).collect())
} else {
Ok(vec![arg])
}
}
pub fn arg_expand_all(at_args: &[String]) -> Vec<String> {
let mut args = Vec::new();
for arg in at_args {
match arg_expand(arg.clone()) {
Ok(arg) => args.extend(arg),
Err(err) => rustc_session::early_error(
rustc_session::config::ErrorOutputType::default(),
&format!("Failed to load argument file: {err}"),
),
}
}
args
}
#[derive(Debug)]
pub enum Error {
Utf8Error(Option<String>),
IOError(String, io::Error),
}
impl fmt::Display for Error {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Error::Utf8Error(None) => write!(fmt, "Utf8 error"),
Error::Utf8Error(Some(path)) => write!(fmt, "Utf8 error in {path}"),
Error::IOError(path, err) => write!(fmt, "IO Error: {path}: {err}"),
}
}
}
impl error::Error for Error {}
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