Macro glib::g_log

macro_rules! g_log {
    ($log_level:expr, $format:literal, $($arg:expr),* $(,)?) => { ... };
    ($log_level:expr, $format:literal $(,)?) => { ... };
    ($log_domain:expr, $log_level:expr, $format:literal, $($arg:expr),* $(,)?) => { ... };
    ($log_domain:expr, $log_level:expr, $format:literal $(,)?) => { ... };
}

Macro used to log using GLib logging system. It uses g_log.

Example:

use glib::{LogLevel, g_log};

g_log!("test", LogLevel::Debug, "test");
g_log!("test", LogLevel::Message, "test");
// trailing commas work as well:
g_log!("test", LogLevel::Message, "test",);

// You can also pass arguments like in format! or println!:
let x = 12;
g_log!("test", LogLevel::Error, "test: {}", x);
g_log!("test", LogLevel::Critical, "test: {}", x);
g_log!("test", LogLevel::Warning, "test: {} {}", x, "a");
// trailing commas work as well:
g_log!("test", LogLevel::Warning, "test: {} {}", x, "a",);

To be noted that the log domain is optional:

use glib::{LogLevel, g_log};

// As you can see: no log domain:
g_log!(LogLevel::Message, "test");
// For the rest, it's just like when you have the log domain:
// trailing commas:
g_log!(LogLevel::Message, "test",);

// formatting:
let x = 12;
g_log!(LogLevel::Warning, "test: {} {}", x, "a");
g_log!(LogLevel::Warning, "test: {} {}", x, "a",);