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//! Debug error logging.
use std::ffi::OsStr;
use ansi_term::{Colour, ANSIString};
/// Sets the internal logger, changing the log level based on the value of an
/// environment variable.
pub fn configure<T: AsRef<OsStr>>(ev: Option<T>) {
let ev = match ev {
Some(v) => v,
None => return,
};
let env_var = ev.as_ref();
if env_var.is_empty() {
return;
}
if env_var == "trace" {
log::set_max_level(log::LevelFilter::Trace);
}
else {
log::set_max_level(log::LevelFilter::Debug);
}
let result = log::set_logger(GLOBAL_LOGGER);
if let Err(e) = result {
eprintln!("Failed to initialise logger: {}", e);
}
}
#[derive(Debug)]
struct Logger;
const GLOBAL_LOGGER: &Logger = &Logger;
impl log::Log for Logger {
fn enabled(&self, _: &log::Metadata<'_>) -> bool {
true // no need to filter after using ‘set_max_level’.
}
fn log(&self, record: &log::Record<'_>) {
let open = Colour::Fixed(243).paint("[");
let level = level(record.level());
let close = Colour::Fixed(243).paint("]");
eprintln!("{}{} {}{} {}", open, level, record.target(), close, record.args());
}
fn flush(&self) {
// no need to flush with ‘eprintln!’.
}
}
fn level(level: log::Level) -> ANSIString<'static> {
match level {
log::Level::Error => Colour::Red.paint("ERROR"),
log::Level::Warn => Colour::Yellow.paint("WARN"),
log::Level::Info => Colour::Cyan.paint("INFO"),
log::Level::Debug => Colour::Blue.paint("DEBUG"),
log::Level::Trace => Colour::Fixed(245).paint("TRACE"),
}
}
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