Struct fern::colors::ColoredLevelConfig

pub struct ColoredLevelConfig {
    pub error: Color,
    pub warn: Color,
    pub info: Color,
    pub debug: Color,
    pub trace: Color,
}

Configuration specifying colors a log level can be colored as.

Example usage setting custom ‘info’ and ‘debug’ colors:

use fern::colors::{Color, ColoredLevelConfig};

let colors = ColoredLevelConfig::new()
    .info(Color::Green)
    .debug(Color::Magenta);

fern::Dispatch::new()
    .format(move |out, message, record| {
        out.finish(format_args!(
            "[{}] {}",
            colors.color(record.level()),
            message
        ))
    })
    .chain(std::io::stdout())
    .apply()?;

Fields

error: Color

The color to color logs with the Error level.

warn: Color

The color to color logs with the Warn level.

info: Color

The color to color logs with the Info level.

debug: Color

The color to color logs with the Debug level.

trace: Color

The color to color logs with the Trace level.

Implementations

impl ColoredLevelConfig

pub fn new() -> Self

Creates a new ColoredLevelConfig with the default colors.

This matches the behavior of ColoredLevelConfig::default.

pub fn error(self, error: Color) -> Self

Overrides the Error level color with the given color.

The default color is Color::Red.

pub fn warn(self, warn: Color) -> Self

Overrides the Warn level color with the given color.

The default color is Color::Yellow.

pub fn info(self, info: Color) -> Self

Overrides the Info level color with the given color.

The default color is Color::White.

pub fn debug(self, debug: Color) -> Self

Overrides the Debug level color with the given color.

The default color is Color::White.

pub fn trace(self, trace: Color) -> Self

Overrides the Trace level color with the given color.

The default color is Color::White.

pub fn color(&self, level: Level) -> WithFgColor<Level>

Colors the given log level with the color in this configuration corresponding to it’s level.

The structure returned is opaque, but will print the Level surrounded by ANSI color codes when displayed. This will work correctly for UNIX terminals, but due to a lack of support from the colored crate, this will not function in Windows.

pub fn get_color(&self, level: &Level) -> Color

Retrieves the color that a log level should be colored as.

Trait Implementations

impl Clone for ColoredLevelConfig

fn clone(&self) -> ColoredLevelConfig

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for ColoredLevelConfig

fn default() -> Self

Retrieves the default configuration. This has:

• Error as Color::Red
• Warn as Color::Yellow
• Info as Color::White
• Debug as Color::White
• Trace as Color::White

impl Copy for ColoredLevelConfig