| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| //! Error handling utilities. WIP. |
| |
| use std::error::Error; |
| use std::fmt; |
| |
| pub type CliError = Box<Error + 'static>; |
| pub type CliResult<T> = Result<T, CliError>; |
| |
| pub type CommandError = Box<Error + 'static>; |
| pub type CommandResult<T> = Result<T, CommandError>; |
| |
| pub fn err(s: &str) -> CliError { |
| #[derive(Debug)] |
| struct E(String); |
| |
| impl Error for E { |
| fn description(&self) -> &str { &self.0 } |
| } |
| impl fmt::Display for E { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| self.0.fmt(f) |
| } |
| } |
| |
| Box::new(E(s.to_string())) |
| } |