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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
use once_cell::sync::Lazy;
use std::fmt;
use std::fmt::Write as _;
use std::io::IsTerminal;
use termcolor::Ansi;
use termcolor::Color::Ansi256;
use termcolor::Color::Black;
use termcolor::Color::Blue;
use termcolor::Color::Cyan;
use termcolor::Color::Green;
use termcolor::Color::Magenta;
use termcolor::Color::Red;
use termcolor::Color::White;
use termcolor::Color::Yellow;
use termcolor::ColorSpec;
use termcolor::WriteColor;
#[cfg(windows)]
use termcolor::BufferWriter;
#[cfg(windows)]
use termcolor::ColorChoice;
static NO_COLOR: Lazy<bool> = Lazy::new(|| {
std::env::var_os("NO_COLOR")
.map(|v| !v.is_empty())
.unwrap_or(false)
});
static IS_TTY: Lazy<bool> = Lazy::new(|| std::io::stdout().is_terminal());
pub fn is_tty() -> bool {
*IS_TTY
}
pub fn use_color() -> bool {
!(*NO_COLOR)
}
#[cfg(windows)]
pub fn enable_ansi() {
BufferWriter::stdout(ColorChoice::AlwaysAnsi);
}
/// A struct that can adapt a `fmt::Write` to a `std::io::Write`. If anything
/// that can not be represented as UTF-8 is written to this writer, it will
/// return an error.
struct StdFmtStdIoWriter<'a>(&'a mut dyn fmt::Write);
impl std::io::Write for StdFmtStdIoWriter<'_> {
fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
let str = std::str::from_utf8(buf).map_err(|_| {
std::io::Error::new(
std::io::ErrorKind::Other,
"failed to convert bytes to str",
)
})?;
match self.0.write_str(str) {
Ok(_) => Ok(buf.len()),
Err(_) => Err(std::io::Error::new(
std::io::ErrorKind::Other,
"failed to write to fmt::Write",
)),
}
}
fn flush(&mut self) -> std::io::Result<()> {
Ok(())
}
}
/// A struct that can adapt a `std::io::Write` to a `fmt::Write`.
struct StdIoStdFmtWriter<'a>(&'a mut dyn std::io::Write);
impl fmt::Write for StdIoStdFmtWriter<'_> {
fn write_str(&mut self, s: &str) -> fmt::Result {
self.0.write_all(s.as_bytes()).map_err(|_| fmt::Error)?;
Ok(())
}
}
struct Style<I: fmt::Display> {
colorspec: ColorSpec,
inner: I,
}
impl<I: fmt::Display> fmt::Display for Style<I> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if !use_color() {
return fmt::Display::fmt(&self.inner, f);
}
let mut ansi_writer = Ansi::new(StdFmtStdIoWriter(f));
ansi_writer
.set_color(&self.colorspec)
.map_err(|_| fmt::Error)?;
write!(StdIoStdFmtWriter(&mut ansi_writer), "{}", self.inner)?;
ansi_writer.reset().map_err(|_| fmt::Error)?;
Ok(())
}
}
#[inline]
fn style<'a>(
s: impl fmt::Display + 'a,
colorspec: ColorSpec,
) -> impl fmt::Display + 'a {
Style {
colorspec,
inner: s,
}
}
pub fn red_bold<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_fg(Some(Red)).set_bold(true);
style(s, style_spec)
}
pub fn green_bold<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_fg(Some(Green)).set_bold(true);
style(s, style_spec)
}
pub fn italic<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_italic(true);
style(s, style_spec)
}
pub fn italic_gray<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_fg(Some(Ansi256(8))).set_italic(true);
style(s, style_spec)
}
pub fn italic_bold<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_bold(true).set_italic(true);
style(s, style_spec)
}
pub fn white_on_red<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
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<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_bg(Some(Green)).set_fg(Some(Black));
style(s, style_spec)
}
pub fn yellow<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_fg(Some(Yellow));
style(s, style_spec)
}
pub fn cyan<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_fg(Some(Cyan));
style(s, style_spec)
}
pub fn cyan_with_underline<'a>(
s: impl fmt::Display + 'a,
) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_fg(Some(Cyan)).set_underline(true);
style(s, style_spec)
}
pub fn cyan_bold<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_fg(Some(Cyan)).set_bold(true);
style(s, style_spec)
}
pub fn magenta<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_fg(Some(Magenta));
style(s, style_spec)
}
pub fn red<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_fg(Some(Red));
style(s, style_spec)
}
pub fn green<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_fg(Some(Green));
style(s, style_spec)
}
pub fn bold<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_bold(true);
style(s, style_spec)
}
pub fn gray<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec.set_fg(Some(Ansi256(245)));
style(s, style_spec)
}
pub fn intense_blue<'a>(s: impl fmt::Display + 'a) -> impl fmt::Display + 'a {
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<'a>(
s: impl fmt::Display + 'a,
) -> impl fmt::Display + 'a {
let mut style_spec = ColorSpec::new();
style_spec
.set_bold(true)
.set_bg(Some(Red))
.set_fg(Some(White));
style(s, style_spec)
}
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