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use std::char::ParseCharError;
use std::fmt;
use std::process::exit;
pub trait WithOrExit<T> {
fn or_exit_with(self, exit_code: i32) -> T;
}
impl<T, E: fmt::Debug> WithOrExit<T> for Result<T, E> {
fn or_exit_with(self, exit_code: i32) -> T {
match self {
Ok(v) => v,
Err(e) => {
eprintln!("{:?}", e);
exit(exit_code);
}
}
}
}
impl<T> WithOrExit<T> for Option<T> {
fn or_exit_with(self, exit_code: i32) -> T {
match self {
Some(v) => v,
None => {
eprintln!("Empty option");
exit(exit_code);
}
}
}
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct ParseError(pub String);
impl ParseError {
#[deprecated(since = "0.6.1", note = "Please use the parse_error! macro instead.")]
pub fn of(s: &str) -> ParseError {
ParseError(s.to_string())
}
}
impl fmt::Display for ParseError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.0)
}
}
impl From<std::io::Error> for ParseError {
fn from(err: std::io::Error) -> Self {
ParseError(format!("{:?}", err))
}
}
impl From<std::num::ParseIntError> for ParseError {
fn from(err: std::num::ParseIntError) -> Self {
ParseError(format!("{:?}", err))
}
}
impl From<std::char::ParseCharError> for ParseError {
fn from(err: ParseCharError) -> Self {
ParseError(format!("{:?}", err))
}
}
#[macro_export]
macro_rules! parse_error {
($err:expr) => {{
$crate::error::ParseError($err.to_string())
}};
($err:expr, $($args:tt)*) => {{
$crate::error::ParseError(format!($err, $($args)*))
}};
}
#[macro_export]
macro_rules! err_parse_error {
($err:expr) => {{
Err($crate::parse_error!($err))
}};
($err:expr, $($args:tt)*) => {{
Err($crate::parse_error!($err, $($args)*))
}};
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_macro_parse_error_simple() {
let err = parse_error!["This is a simple error."];
assert_eq!(err, ParseError("This is a simple error.".to_string()));
}
#[test]
fn test_macro_parse_error_with_formatting() {
let err = parse_error!["This is an error with {}.", "formatting"];
assert_eq!(
err,
ParseError("This is an error with formatting.".to_string())
);
}
#[test]
fn test_macro_err_parse_error_simple() {
let err: Result<(), ParseError> = err_parse_error!["This is a simple error."];
assert_eq!(err, Err(ParseError("This is a simple error.".to_string())));
}
#[test]
fn test_macro_err_parse_error_with_formatting() {
let err: Result<(), ParseError> =
err_parse_error!["This is an error with {}.", "formatting"];
assert_eq!(
err,
Err(ParseError("This is an error with formatting.".to_string()))
);
}
}