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use std::io::{self, Write};
use log::{Level, LevelFilter, Log, Metadata, Record, SetLoggerError};
use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, WriteColor};
pub mod log_macros {
#[doc(no_inline)]
pub use log::{debug, error, info, trace, warn};
}
#[derive(Debug)]
pub enum ColorMode {
Auto,
Always,
Never,
}
impl ColorMode {
fn to_color_choice(&self) -> ColorChoice {
match self {
ColorMode::Auto => {
if atty::is(atty::Stream::Stderr) {
ColorChoice::Auto
} else {
ColorChoice::Never
}
}
ColorMode::Always => ColorChoice::Always,
ColorMode::Never => ColorChoice::Never,
}
}
}
impl Default for ColorMode {
fn default() -> Self {
Self::Auto
}
}
#[derive(Debug)]
struct LogColors {
error: ColorSpec,
warn: ColorSpec,
info: ColorSpec,
debug: ColorSpec,
trace: ColorSpec,
}
impl LogColors {
pub fn new() -> Self {
let error = ColorSpec::new().set_fg(Some(Color::Red)).set_bold(true).to_owned();
let warn = ColorSpec::new().set_fg(Some(Color::Yellow)).set_bold(true).to_owned();
let info = ColorSpec::new();
let debug = ColorSpec::new().set_fg(Some(Color::Cyan)).to_owned();
let trace = ColorSpec::new().set_fg(Some(Color::Blue)).to_owned();
Self { error, warn, info, debug, trace }
}
pub fn get(&self, l: Level) -> &ColorSpec {
match l {
Level::Error => &self.error,
Level::Warn => &self.warn,
Level::Info => &self.info,
Level::Debug => &self.debug,
Level::Trace => &self.trace,
}
}
}
#[derive(Debug)]
pub struct Logger {
level: LevelFilter,
color_choice: ColorChoice,
colors: LogColors,
}
impl Logger {
pub fn with_level(level: LevelFilter) -> Logger {
Self {
level,
color_choice: ColorMode::default().to_color_choice(),
colors: LogColors::new(),
}
}
pub fn with_verbosity(level: usize) -> Logger {
Self::with_level(match level {
0 => LevelFilter::Off,
1 => LevelFilter::Error,
2 => LevelFilter::Warn,
3 => LevelFilter::Info,
4 => LevelFilter::Debug,
_ => LevelFilter::Trace,
})
}
pub fn color(&mut self, c: ColorMode) -> &mut Logger {
self.color_choice = c.to_color_choice();
self
}
pub fn try_init(self) -> Result<(), SetLoggerError> {
log::set_max_level(self.level);
log::set_boxed_logger(Box::new(self))
}
pub fn init(self) {
self.try_init().expect("failed to initialize logger");
}
fn print_log(&self, out: &mut StandardStream, r: &Record) -> io::Result<()> {
let level = r.level();
out.set_color(self.colors.get(level))?;
match level {
Level::Error => writeln!(out, "[ERROR] {}", r.args()),
Level::Warn => writeln!(out, "[WARN] {}", r.args()),
Level::Info => writeln!(out, "{}", r.args()),
Level::Debug => writeln!(
out,
"[DEBUG][{}:{}] {}",
r.file().unwrap_or("?"),
r.line().unwrap_or(0),
r.args()
),
Level::Trace => writeln!(
out,
"[TRACE][{}:{}] {}",
r.file().unwrap_or("?"),
r.line().unwrap_or(0),
r.args()
),
}?;
out.reset()?;
Ok(())
}
}
impl Log for Logger {
fn enabled(&self, m: &Metadata) -> bool {
m.level() <= self.level
}
fn log(&self, r: &Record) {
if !self.enabled(r.metadata()) {
return;
}
let mut out = StandardStream::stderr(self.color_choice);
if let Err(e) = self.print_log(&mut out, r) {
eprintln!("LOGGING ERROR: failed to write log message because of '{}'", e);
eprintln!("Original message: {}: {}", r.level(), r.args());
}
}
fn flush(&self) {}
}