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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use std::io::Write;
struct CliLogger(env_logger::Logger);
impl CliLogger {  pub fn new(logger: env_logger::Logger) -> Self {    Self(logger)  }
  pub fn filter(&self) -> log::LevelFilter {    self.0.filter()  }}
impl log::Log for CliLogger {  fn enabled(&self, metadata: &log::Metadata) -> bool {    self.0.enabled(metadata)  }
  fn log(&self, record: &log::Record) {    if self.enabled(record.metadata()) {      self.0.log(record);    }  }
  fn flush(&self) {    self.0.flush();  }}
pub fn init(maybe_level: Option<log::Level>) {  let log_level = maybe_level.unwrap_or(log::Level::Info);  let logger = env_logger::Builder::from_env(    env_logger::Env::default()      .default_filter_or(log_level.to_level_filter().to_string()),  )  // https://github.com/denoland/deno/issues/6641  .filter_module("rustyline", log::LevelFilter::Off)  // wgpu crates (gfx_backend), have a lot of useless INFO and WARN logs  .filter_module("wgpu", log::LevelFilter::Error)  .filter_module("gfx", log::LevelFilter::Error)  // used to make available the lsp_debug which is then filtered out at runtime  // in the cli logger  .filter_module("deno::lsp::performance", log::LevelFilter::Debug)  .format(|buf, record| {    let mut target = record.target().to_string();    if let Some(line_no) = record.line() {      target.push(':');      target.push_str(&line_no.to_string());    }    if record.level() <= log::Level::Info      || (record.target() == "deno::lsp::performance"        && record.level() == log::Level::Debug)    {      // Print ERROR, WARN, INFO and lsp_debug logs as they are      writeln!(buf, "{}", record.args())    } else {      // Add prefix to DEBUG or TRACE logs      writeln!(        buf,        "{} RS - {} - {}",        record.level(),        target,        record.args()      )    }  })  .build();
  let cli_logger = CliLogger::new(logger);  let max_level = cli_logger.filter();  let r = log::set_boxed_logger(Box::new(cli_logger));  if r.is_ok() {    log::set_max_level(max_level);  }  r.expect("Could not install logger.");}