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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.use regex::Regex;use std::env;use std::fmt;use std::io::Write;use termcolor::Color::{Ansi256, Black, Magenta, Red, White};use termcolor::{Ansi, ColorSpec, WriteColor};
#[cfg(windows)]use termcolor::{BufferWriter, ColorChoice};
lazy_static! {        // STRIP_ANSI_RE and strip_ansi_codes are lifted from the "console" crate.        // Copyright 2017 Armin Ronacher <armin.ronacher@active-4.com>. MIT License.        static ref STRIP_ANSI_RE: Regex = Regex::new(                r"[\x1b\x9b][\[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-PRZcf-nqry=><]"        ).unwrap();        static ref NO_COLOR: bool = {                env::var_os("NO_COLOR").is_some()        };}
/// Helper function to strip ansi codes.pub fn strip_ansi_codes(s: &str) -> std::borrow::Cow<str> {  STRIP_ANSI_RE.replace_all(s, "")}
pub fn use_color() -> bool {  !(*NO_COLOR)}
#[cfg(windows)]pub fn enable_ansi() {  BufferWriter::stdout(ColorChoice::AlwaysAnsi);}
fn style(s: &str, colorspec: ColorSpec) -> impl fmt::Display {  if !use_color() {    return String::from(s);  }  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_bytes()).unwrap();  ansi_writer.reset().unwrap();  String::from_utf8_lossy(&v).into_owned()}
pub fn red_bold(s: String) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Red)).set_bold(true);  style(&s, style_spec)}
pub fn italic_bold(s: String) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_bold(true).set_italic(true);  style(&s, style_spec)}
pub fn black_on_white(s: String) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_bg(Some(White)).set_fg(Some(Black));  style(&s, style_spec)}
pub fn yellow(s: String) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Ansi256(11)));  style(&s, style_spec)}
pub fn cyan(s: String) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Ansi256(14)));  style(&s, style_spec)}
pub fn red(s: String) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Red));  style(&s, style_spec)}
pub fn green(s: String) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Ansi256(10)));  style(&s, style_spec)}
pub fn magenta(s: String) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Magenta));  style(&s, style_spec)}
pub fn bold(s: String) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_bold(true);  style(&s, style_spec)}
pub fn gray(s: String) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec.set_fg(Some(Ansi256(8)));  style(&s, style_spec)}
pub fn italic_bold_gray(s: String) -> impl fmt::Display {  let mut style_spec = ColorSpec::new();  style_spec    .set_fg(Some(Ansi256(8)))    .set_bold(true)    .set_italic(true);  style(&s, style_spec)}