custom_debug

Derive Debug with a custom format per field.

Example usage

Here is a showcase of custom_debugs features:

use custom_debug::Debug;use std::fmt;#[derive(Debug)]structFoo{#[debug(format = "{} things")]x:i32,#[debug(skip)]y:i32,#[debug(with = hex_fmt)]z:i32,#[debug(skip_if = Option::is_none)]label:Option<String>,}fnhex_fmt<T: fmt::Debug>(n:&T,f:&mut fmt::Formatter) -> fmt::Result{write!(f,"0x{:02X?}", n)}

The resulting debug output would look something like this:

Foo {
x: 42 things,
z: 0xAB
}

Field attributes reference

Attributes within a section below are considered mutually exclusive.

Skip attributes

skip	Unconditionally skips a field.
skip_if = path::to::function	Skips a field if path::to::function(&field) returns true.

Format attributes

format = "format string {}"	Formats a field using a format string. Must contain a placeholder ({}) with modifiers of your choice.
with = path::to::formatter	Formats a field using path::to::formatter. The required signature is fn(&T, &mut std::fmt::Formatter) -> std::fmt::Result where T is a type compatible with the field's type (i.e. the function can be generic and coercions apply).