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1 | // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | //! Error handling utilities. WIP. | |
12 | ||
c34b1796 | 13 | use std::error::Error; |
1a4d82fc | 14 | use std::fmt; |
1a4d82fc JJ |
15 | |
16 | pub type CliError = Box<Error + 'static>; | |
17 | pub type CliResult<T> = Result<T, CliError>; | |
18 | ||
19 | pub type CommandError = Box<Error + 'static>; | |
20 | pub type CommandResult<T> = Result<T, CommandError>; | |
21 | ||
c34b1796 AL |
22 | pub fn err(s: &str) -> CliError { |
23 | #[derive(Debug)] | |
24 | struct E(String); | |
1a4d82fc | 25 | |
c34b1796 AL |
26 | impl Error for E { |
27 | fn description(&self) -> &str { &self.0 } | |
1a4d82fc | 28 | } |
c34b1796 AL |
29 | impl fmt::Display for E { |
30 | fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { | |
31 | self.0.fmt(f) | |
32 | } | |
1a4d82fc | 33 | } |
1a4d82fc | 34 | |
c34b1796 | 35 | Box::new(E(s.to_string())) |
1a4d82fc | 36 | } |