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use crate::builder::StyledStr;
use crate::util::color::ColorChoice;
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub(crate) enum Stream {
Stdout,
Stderr,
}
#[derive(Clone, Debug)]
pub(crate) struct Colorizer {
stream: Stream,
#[allow(unused)]
color_when: ColorChoice,
content: StyledStr,
}
impl Colorizer {
pub(crate) fn new(stream: Stream, color_when: ColorChoice) -> Self {
Colorizer {
stream,
color_when,
content: Default::default(),
}
}
pub(crate) fn with_content(mut self, content: StyledStr) -> Self {
self.content = content;
self
}
}
/// Printing methods.
impl Colorizer {
#[cfg(feature = "color")]
pub(crate) fn print(&self) -> std::io::Result<()> {
use termcolor::{BufferWriter, ColorChoice as DepColorChoice};
let color_when = match self.color_when {
ColorChoice::Always => DepColorChoice::Always,
ColorChoice::Auto if is_a_tty(self.stream) => DepColorChoice::Auto,
_ => DepColorChoice::Never,
};
let writer = match self.stream {
Stream::Stderr => BufferWriter::stderr(color_when),
Stream::Stdout => BufferWriter::stdout(color_when),
};
let mut buffer = writer.buffer();
ok!(self.content.write_colored(&mut buffer));
writer.print(&buffer)
}
#[cfg(not(feature = "color"))]
pub(crate) fn print(&self) -> std::io::Result<()> {
use std::io::Write;
// [e]println can't be used here because it panics
// if something went wrong. We don't want that.
match self.stream {
Stream::Stdout => {
let stdout = std::io::stdout();
let mut stdout = stdout.lock();
write!(stdout, "{}", self)
}
Stream::Stderr => {
let stderr = std::io::stderr();
let mut stderr = stderr.lock();
write!(stderr, "{}", self)
}
}
}
}
/// Color-unaware printing. Never uses coloring.
impl std::fmt::Display for Colorizer {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
self.content.fmt(f)
}
}
#[cfg(feature = "color")]
fn is_a_tty(stream: Stream) -> bool {
use is_terminal::IsTerminal;
match stream {
Stream::Stdout => std::io::stdout().is_terminal(),
Stream::Stderr => std::io::stderr().is_terminal(),
}
}
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