vlog-rs

Macros to do stdout / stderr logs based on verbosity level, which take in the same arguments as println! macro.

Useful for CLI applications. The default verbosity level is 0, and the supported max verbosity level is 3, which is equivalent to -vvv flags as seen in most Linux CLI applications.

Example

#[macro_use]
extern crate vlog;

use vlog::{get_verbosity_level, set_verbosity_level};

fn main() {
    // default verbosity level is 0
    assert_eq!(0, get_verbosity_level());

    v0!("v0 stdout prints");
    v1!("v1 stdout won't print");
    v2!("v2 stdout won't print");
    v3!("v3 stdout won't print");

    ve0!("ve0 stderr prints");
    ve1!("ve1 stderr won't print");
    ve2!("ve2 stderr won't print");
    ve3!("ve3 stderr won't print");

    // set custom verbosity level
    set_verbosity_level(1);
    assert_eq!(1, get_verbosity_level());

    v0!("{} stdout prints", "v0");
    v1!("{} stdout prints", "v1");
    v2!("{} stdout won't print", "v2");
    v3!("{} stdout won't print", "v3");

    ve0!("{} stderr prints", "ve0");
    ve1!("{} stderr prints", "ve1");
    ve2!("{} stderr won't print", "ve2");
    ve3!("{} stderr won't print", "ve3");

    // set custom max verbosity level
    set_verbosity_level(3);
    assert_eq!(3, get_verbosity_level());

    v0!("{} stdout prints", "v0");
    v1!("{} stdout prints", "v1");
    v2!("{} stdout prints", "v2");
    v3!("{} stdout prints", "v3");

    ve0!("{} stderr prints", "ve0");
    ve1!("{} stderr prints", "ve1");
    ve2!("{} stderr prints", "ve2");
    ve3!("{} stderr prints", "ve3");
}