Crate tracing_print

tracing-print

A simple println-like format for tracing-subscriber.

Prints the message field of an event and no others. Formats the message according to log level:

• ERROR: red
• WARN: yellow
• INFO: no formatting
• DEBUG: blue
• TRACE: dim

Usage

let layer = tracing_subscriber::fmt::layer()
    .event_format(tracing_print::Print::default());

Example

Run this example: cargo run --example simple

tracing::error!("error");
tracing::warn!("warn");
tracing::info!("info");
tracing::debug!("debug");
tracing::trace!("trace");

// Functions as a newline
tracing::info!("");

// Other keys than message won't be displayed
tracing::info!(key = "unseen", "only message will be seen");

// Format macros work like normal
tracing::info!(
    "newlines and formatting work\nsee? display={}, debug={:#?}",
    1337,
    Dummy::default()
);

// Extra ANSI colors can also be applied
tracing::info!(
    "{} {} {}",
    "extra".bold(),
    "ansi".underline(),
    "formatting".italic()
);
tracing::error!("{}", "applies before level".underline())

Looks like this:

error
warn
info
debug
trace

only message will be seen
newlines and formatting work
see? display=1337, debug=Dummy {
    _field: (),
}
extra ansi formatting
applies before level

Structs

MessageVisitor

A visitor to capture only the message field.

Print

Simple println format for tracing-subscriber. Prints the message field of an event and no others.