radicle_std_ext/
result.rs

1pub trait ResultExt<T, E> {
2    /// Calls `f` if the result is [`Err`], **and** the predicate `pred` on the
3    /// error value returns true. Otherwise returns the [`Ok`] value of
4    /// `self`. Note that `f` may change the error type, so as long as the
5    /// target type can be converted from the original one.
6    ///
7    /// # Examples
8    ///
9    /// ```
10    /// use std::io;
11    /// use radicle_std_ext::result::ResultExt as _;
12    ///
13    /// let res = Err(io::Error::new(io::ErrorKind::Other, "crashbug"))
14    ///     .or_matches::<io::Error, _, _>(|e| matches!(e.kind(), io::ErrorKind::Other), || Ok(()))
15    ///     .unwrap();
16    ///
17    /// assert_eq!((), res)
18    /// ```
19    fn or_matches<E2, P, F>(self, pred: P, f: F) -> Result<T, E2>
20    where
21        E2: From<E>,
22        P: FnOnce(&E) -> bool,
23        F: FnOnce() -> Result<T, E2>;
24}
25
26impl<T, E> ResultExt<T, E> for Result<T, E> {
27    fn or_matches<E2, P, F>(self, pred: P, f: F) -> Result<T, E2>
28    where
29        E2: From<E>,
30        P: FnOnce(&E) -> bool,
31        F: FnOnce() -> Result<T, E2>,
32    {
33        self.or_else(|e| if pred(&e) { f() } else { Err(e.into()) })
34    }
35}
radicle_std_ext/result.rs

radicle_std_ext/
result.rs
