veil 0.3.0

Rust derive macro for redacting sensitive data in `std::fmt::Debug`
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

/// HACK! This function is used to generate a struct that gives us quick access
/// to a `&mut std::fmt::Formatter` which is used extensively throughout the `private` module.
///
/// This allows us to design & expose an API that can return `String` directly, but reuses the same
/// code we've already written that writes to a `&mut std::fmt::Formatter` internally, thereby
/// avoiding code duplication from generics.
pub fn give_me_a_formatter<F>(op: F) -> impl std::fmt::Display
where
    F: Fn(&mut std::fmt::Formatter<'_>) -> std::fmt::Result,
{
    struct GiveMeAFormatter<F>(F)
    where
        F: Fn(&mut std::fmt::Formatter<'_>) -> std::fmt::Result;

    impl<F> std::fmt::Display for GiveMeAFormatter<F>
    where
        F: Fn(&mut std::fmt::Formatter<'_>) -> std::fmt::Result,
    {
        #[inline(always)]
        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
            (self.0)(f)
        }
    }

    GiveMeAFormatter(op)
}