Struct RuntimePattern

pub struct RuntimePattern(/* private fields */);

Available on crate feature runtime-pattern only.

Runtime pattern built via runtime_pattern! macro.

Basic Usage

use spdlog::info;

let formatter = PatternFormatter::new(runtime_pattern!("[{level}] {payload}{eol}")?);

info!(logger: doctest, "Interesting log message");
/* Output */ "[info] Interesting log message\n"

With Custom Patterns

use std::fmt::Write;

use spdlog::{
    formatter::{pattern, Pattern, PatternContext, PatternFormatter, runtime_pattern, RuntimePattern},
    Record, StringBuf, info
};
 
#[derive(Default, Clone)]
struct MyPattern;
 
impl Pattern for MyPattern {
   fn format(&self, record: &Record, dest: &mut StringBuf, _: &mut PatternContext) -> spdlog::Result<()> {
       write!(dest, "My own pattern").map_err(spdlog::Error::FormatRecord)
   }
}

let template = "[{level}] {payload} - {$mypat1} {$mypat2}{eol}";
fn pat() -> impl Pattern { pattern!("[{level_short}-{level}]") }
let formatter = PatternFormatter::new(
    runtime_pattern!(
        template,
        {$mypat1} => MyPattern::default,
        {$mypat2} => pat
    )?
);

info!(logger: doctest, "Interesting log message");
/* Output */ "[info] Interesting log message - My own pattern [I-info]\n"

Trait Implementations

impl Clone for RuntimePattern

fn clone(&self) -> RuntimePattern

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Pattern for RuntimePattern

fn format( &self, record: &Record<'_>, dest: &mut StringBuf, ctx: &mut PatternContext<'_, '_>, ) -> Result<()>

Format this pattern against the given log record and write the formatted message into the output buffer.