Centralized logging with Levels/Verbosity

[mclang]

Problem

Using CLIARGS.Verbosity everywhere where needed is cumbersome, so centralized logging solution is needed.

Solution

Either start using crates like log and env_logger or cook up your own simple function/macro.

Starting point could be something like what ChatGPT suggested:

#[macro_export]
macro_rules! log_msg {
    ($fmt:expr $(, $($arg:tt)*)?) => {
        println!("[{}:{}] {}", file!(), line!(), $fmt $(, $($arg)*)?);
    };
}

fn main() {
    ...
    log_msg!("This is a log message");
    log_msg!("Log message with an argument: {}", 42);
    ...
}

fn log_msg<T: std::fmt::Display>(level: &str, fmt: &str, args: T) {
    let file = file!();
    let line = line!();
    let message = format!("{}", args);
    println!("[{}:{}] [{}] {}", file, line, level, fmt, message);
}

fn main() {
    ...
    log_msg("INFO", "This is an info message", "");
    log_msg("WARN", "This is a warning message with an argument: {}", 42);
    ...
}

I bet that neither of above will work right out of the box, but afterwards implementing log levels should be easy.