use env_logger::{Builder, Env, Target}; use std::io::Write; pub fn init_log_system() { let env = Env::new().filter_or(crate::LOG_LEVEL_ENV_VAR, "warn"); let mut builder = Builder::from_env(env); builder.format(|buf, record| { writeln!( buf, "{}: {}", record.level().to_string().to_lowercase(), record.args() ) }); builder.target(Target::Stderr); builder.init(); }