basalt_cli.rs
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use std::fmt::{ self };
use std::io::{ self };
use std::process::{ ExitCode };
// -------------------------------------------------------------------------------------------------
// Error handling
// -------------------------------------------------------------------------------------------------
type Result<T> = ::std::result::Result<T, Error>;
#[derive(Debug)]
enum Error {
FromBasalt(basalt::Error),
FromStdIo(io::Error),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use Error::*;
match *self {
FromBasalt(ref e) => write!(f, "Basalt error: {}", e),
FromStdIo(ref e) => write!(f, "IO error: {}", e),
}
}
}
impl From<io::Error> for Error {
fn from(e: io::Error) -> Error {
Error::FromStdIo(e)
}
}
impl From<basalt::Error> for Error {
fn from(e: basalt::Error) -> Error {
Error::FromBasalt(e)
}
}
fn main() -> ExitCode {
let result = repl();
match result {
Ok(_) => ExitCode::SUCCESS,
Err(e) => {
eprintln!("{}", e);
ExitCode::FAILURE
}
}
}
fn repl() -> Result<()> {
Ok(())
}