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/target/
**/*.rs.bk
.idea

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language: rust
matrix:
include:
- rust: stable
- rust: beta
- rust: nightly
script:
- cargo test
- rustdoc --test README.md -L target

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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "die"
version = "0.1.0"

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[package]
name = "die"
version = "0.1.0"
authors = ["moparisthebest <admin@moparisthebest.com>"]
description = "Handle errors and exit in command line programs easily."
repository = "https://code.moparisthebest.com/moparisthebest/die"
keywords = ["die", "stderr", "cmd", "cmdline", "exit"]
license = "MIT/Apache-2.0"
readme = "README.md"
include = [
"**/*.rs",
"Cargo.toml",
"LICENSE-*",
"*.md",
]

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Copyright (c) 2019 Travis Burtrum
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# die
[![Build Status](https://travis-ci.com/moparisthebest/die.svg?branch=master)](https://travis-ci.com/moparisthebest/die)
[![Latest Version](https://img.shields.io/crates/v/die.svg)](https://crates.io/crates/die)
[![Documentation](https://docs.rs/die/badge.svg)](https://docs.rs/die)
[die] is a simple Rust library to make it easy to handle errors and exit in command line programs.
[die]: https://code.moparisthebest.com/moparisthebest/die
```toml
# Cargo.toml
[dependencies]
die = "0.1"
```
# License
This project is licensed under either of
* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or
http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in die by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.

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// 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.
use std::process;
pub const DEFAULT_EXIT_CODE: i32 = 1;
/// Prints a message to stderr and terminates the current process with the specified exit code
/// or 1 if no exit code is specified, by calling eprintln!() on all arguments followed by
/// process::exit(exit_code)
///
/// # Examples
///
/// Basic usage:
///
/// ```{.should_panic}
/// use die::die;
/// die!("argument to -e must be numeric"); // prints message to stderr then exits with code 1
/// ```
/// With custom error code:
/// ```{.should_panic}
/// use die::die;
/// die!(2; "argument to -e must be numeric"); // prints message to stderr then exits with code 2
/// ```
/// error code can go at the beginning or end, just separate with colon:
/// ```{.should_panic}
/// use die::die;
/// die!("argument to -e must be numeric"; 3); // prints message to stderr then exits with code 3
/// ```
/// supports all the formatting eprintln! does:
/// ```{.should_panic}
/// use die::die;
/// die!("argument {} must be {}", "-e", 1; 4); // prints `argument -e must be 1` to stderr then exits with code 4
/// ```
/// supports all the formatting eprintln! does without exit code too:
/// ```{.should_panic}
/// use die::die;
/// die!("argument {} must be {}", "-e", 1); // prints `argument -e must be 1` to stderr then exits with code 1
/// ```
/// just exit with a code alone:
/// ```{.should_panic}
/// use die::die;
/// die!(2); // prints nothing, only exits with code 3
/// ```
/// just exit:
/// ```{.should_panic}
/// use die::die;
/// die!(); // prints nothing, only exits with code 1
/// ```
#[macro_export]
macro_rules! die {
() => (::std::process::exit(::die::DEFAULT_EXIT_CODE));
($x:expr) => (::die::PrintExit::process(&$x));
($x:expr; $y:expr) => (::die::PrintExit::process(&($x, $y)));
($x:expr; $($y:expr),+) => ({
eprintln!($($y),+);
::std::process::exit($x)
});
($($y:expr),+; $x:expr) => ({
eprintln!($($y),+);
::std::process::exit($x)
});
($($arg:tt)*) => ({
eprintln!($($arg)*);
::std::process::exit(::die::DEFAULT_EXIT_CODE)
});
}
pub trait Die<T> {
/// Unwraps a result/option, yielding the content of an [`Ok`] or [`Some`].
///
/// # Exits
///
/// Calls process::exit(1) if the value is an [`Err`]/[`None`], after printing the
/// passed message to stderr.
///
/// [`Ok`]: enum.Result.html#variant.Ok
/// [`Err`]: enum.Result.html#variant.Err
/// [`Some`]: enum.Option.html#variant.Some
/// [`None`]: enum.Option.html#variant.None
///
/// # Examples
///
/// Basic usage:
///
/// ```{.should_panic}
/// use die::Die;
/// let x: Result<u32, &str> = Err("emergency failure");
/// x.die("strange error"); // prints `strange error` to stderr then exits with code 1
/// ```
fn die(self, msg: &str) -> T;
/// Unwraps a result/option, yielding the content of an [`Ok`] or [`Some`].
///
/// # Exits
///
/// Calls process::exit(exit_code) if the value is an [`Err`]/[`None`], after printing the
/// passed message to stderr.
///
/// [`Ok`]: enum.Result.html#variant.Ok
/// [`Err`]: enum.Result.html#variant.Err
/// [`Some`]: enum.Option.html#variant.Some
/// [`None`]: enum.Option.html#variant.None
///
/// # Examples
///
/// Basic usage:
///
/// ```{.should_panic}
/// use die::Die;
/// let x: Result<u32, &str> = Err("emergency failure");
/// x.die_code("strange error", 3); // prints `strange error` to stderr then exits with code 3
/// ```
fn die_code(self, msg: &str, exit_code: i32) -> T;
}
impl<T, E> Die<T> for Result<T, E> {
#[inline]
fn die(self, msg: &str) -> T {
self.die_code(msg, DEFAULT_EXIT_CODE)
}
#[inline]
fn die_code(self, msg: &str, exit_code: i32) -> T {
match self {
Ok(t) => t,
Err(_) => PrintExit::process(&(exit_code, msg)),
}
}
}
impl<T> Die<T> for Option<T> {
#[inline]
fn die(self, msg: &str) -> T {
self.die_code(msg, DEFAULT_EXIT_CODE)
}
#[inline]
fn die_code(self, msg: &str, exit_code: i32) -> T {
match self {
Some(t) => t,
None => PrintExit::process(&(exit_code, msg)),
}
}
}
pub trait PrintExit {
#[inline]
fn process(&self) -> !;
}
impl PrintExit for i32 {
#[inline]
fn process(&self) -> ! {
process::exit(*self)
}
}
impl PrintExit for &str {
#[inline]
fn process(&self) -> ! {
eprintln!("{}", self);
process::exit(DEFAULT_EXIT_CODE)
}
}
impl PrintExit for String {
#[inline]
fn process(&self) -> ! {
eprintln!("{}", self);
process::exit(DEFAULT_EXIT_CODE)
}
}
impl PrintExit for (i32, &str) {
#[inline]
fn process(&self) -> ! {
eprintln!("{}", self.1);
process::exit(self.0)
}
}
impl PrintExit for (i32, String) {
#[inline]
fn process(&self) -> ! {
eprintln!("{}", self.1);
process::exit(self.0)
}
}
impl PrintExit for (&str, i32) {
#[inline]
fn process(&self) -> ! {
eprintln!("{}", self.0);
process::exit(self.1)
}
}
impl PrintExit for (String, i32) {
#[inline]
fn process(&self) -> ! {
eprintln!("{}", self.0);
process::exit(self.1)
}
}