fern::Dispatch::new()

.format(|out, message, record| {

let level_string = match record.level() {

Level::Error => record.level().to_string().red(),

Level::Warn => record.level().to_string().yellow(),

Level::Info => record.level().to_string().cyan(),

Level::Debug => record.level().to_string().purple(),

Level::Trace => record.level().to_string().normal(),

};

let target = if !record.target().is_empty() {

record.target()

} else {

record.module_path().unwrap_or_default()

};

let datetime: OffsetDateTime = match OffsetDateTime::now_local() {

Ok(x) => x,

Err(_) => OffsetDateTime::now_utc(),

};

out.finish(format_args!(

"{} {:<5} [{}] {}",

datetime

.format(format_description!(

"[year]-[month]-[day] [hour]:[minute]:[second],[subsecond digits:3]"

))

.unwrap(),

level_string,

target,

message,

));

})

.level(level)

// cranelift_codegen spams debug-level logs

.level_for("cranelift_codegen", LevelFilter::Info)

.level_for("regalloc", LevelFilter::Off)

.level_for("wasmer_wasi::syscalls", LevelFilter::Info)

.level_for("wasmer_compiler_cranelift::translator", LevelFilter::Warn)

.chain(std::io::stdout())

.apply()

.unwrap();