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core: add as_str() for Level (#1413) (#1416)

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## Motivation

Get the string representation of the `Level` is quite a common usecase.
Without this method, I normally need to implement it by myself, which
is fairly noisy.

```rust
#[inline]
fn level_to_str(level: &tracing::Level) -> &'static str {
    match *level {
        tracing::Level::TRACE => "TRACE",
        tracing::Level::DEBUG => "DEBUG",
        tracing::Level::INFO => "INFO",
        tracing::Level::WARN => "WARN",
        tracing::Level::ERROR => "ERROR"
    }
}
```

## Solution

Add an `as_str()` method for `Level`. Similar to [log::Level::as_str()][1].

[1]: https://docs.rs/log/0.4.14/log/enum.Level.html#method.as_str
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Folyd 2021-05-28 00:36:58 +08:00 committed by GitHub
parent 2920a89aa5
commit 9702bf50fc
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13
tracing-core/src/metadata.rs
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@ -283,6 +283,19 @@ impl Level {
///
/// Designates very low priority, often extremely verbose, information.
pub const TRACE: Level = Level(LevelInner::Trace);
/// Returns the string representation of the `Level`.
///
/// This returns the same string as the `fmt::Display` implementation.
pub fn as_str(&self) -> &'static str {
match *self {
Level::TRACE => "TRACE",
Level::DEBUG => "DEBUG",
Level::INFO => "INFO",
Level::WARN => "WARN",
Level::ERROR => "ERROR",
}
}
}
impl fmt::Display for Level {