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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use atty;use once_cell::sync::Lazy;use std::fmt;use std::io::Write;use termcolor::Color::{Ansi256, Black, Blue, Cyan, Green, Red, White, Yellow};use termcolor::{Ansi, ColorSpec, WriteColor};
#[cfg(windows)]use termcolor::{BufferWriter, ColorChoice};
static NO_COLOR: Lazy<bool> =  Lazy::new(|| std::env::var_os("NO_COLOR").is_some());
static IS_TTY: Lazy<bool> = Lazy::new(|| atty::is(atty::Stream::Stdout));
pub fn is_tty() -> bool {  *IS_TTY}
pub fn use_color() -> bool {  !(*NO_COLOR)}
#[cfg(windows)]pub fn enable_ansi() {  BufferWriter::stdout(ColorChoice::AlwaysAnsi);}
fn style<S: AsRef<str>>(s: S, colorspec: ColorSpec) -> impl fmt::Display {  if !use_color() {    return String::from(s.as_ref());  }  let mut v = Vec::new();  let mut ansi_writer = Ansi::new(&mut v);  ansi_writer.set_color(&colorspec).unwrap();  ansi_writer.write_all(s.as_ref().as_bytes()).unwrap();  ansi_writer.reset().unwrap();  String::from_utf8_lossy(&v).into_owned()}
pub fn red_bold<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Red)).set_bold(true);  style(s, style_spec)}
pub fn green_bold<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Green)).set_bold(true);  style(s, style_spec)}
pub fn italic<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_italic(true);  style(s, style_spec)}
pub fn italic_gray<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Ansi256(8))).set_italic(true);  style(s, style_spec)}
pub fn italic_bold<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_bold(true).set_italic(true);  style(s, style_spec)}
pub fn white_on_red<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_bg(Some(Red)).set_fg(Some(White));  style(s, style_spec)}
pub fn black_on_green<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_bg(Some(Green)).set_fg(Some(Black));  style(s, style_spec)}
pub fn yellow<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Yellow));  style(s, style_spec)}
pub fn cyan<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Cyan));  style(s, style_spec)}
pub fn red<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Red));  style(s, style_spec)}
pub fn green<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Green));  style(s, style_spec)}
pub fn bold<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_bold(true);  style(s, style_spec)}
pub fn gray<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Ansi256(245)));  style(s, style_spec)}
pub fn intense_blue<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Blue)).set_intense(true);  style(s, style_spec)}
pub fn white_bold_on_red<S: AsRef<str>>(s: S) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec    .set_bold(true)    .set_bg(Some(Red))    .set_fg(Some(White));  style(s, style_spec)}