ansi_term/ansi.rs
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use style::{Colour, Style};
use std::fmt;
use write::AnyWrite;
// ---- generating ANSI codes ----
impl Style {
/// Write any bytes that go *before* a piece of text to the given writer.
fn write_prefix<W: AnyWrite + ?Sized>(&self, f: &mut W) -> Result<(), W::Error> {
// If there are actually no styles here, then don’t write *any* codes
// as the prefix. An empty ANSI code may not affect the terminal
// output at all, but a user may just want a code-free string.
if self.is_plain() {
return Ok(());
}
// Write the codes’ prefix, then write numbers, separated by
// semicolons, for each text style we want to apply.
write!(f, "\x1B[")?;
let mut written_anything = false;
{
let mut write_char = |c| {
if written_anything { write!(f, ";")?; }
written_anything = true;
write!(f, "{}", c)?;
Ok(())
};
if self.is_bold { write_char('1')? }
if self.is_dimmed { write_char('2')? }
if self.is_italic { write_char('3')? }
if self.is_underline { write_char('4')? }
if self.is_blink { write_char('5')? }
if self.is_reverse { write_char('7')? }
if self.is_hidden { write_char('8')? }
if self.is_strikethrough { write_char('9')? }
}
// The foreground and background colours, if specified, need to be
// handled specially because the number codes are more complicated.
// (see `write_background_code` and `write_foreground_code`)
if let Some(bg) = self.background {
if written_anything { write!(f, ";")?; }
written_anything = true;
bg.write_background_code(f)?;
}
if let Some(fg) = self.foreground {
if written_anything { write!(f, ";")?; }
fg.write_foreground_code(f)?;
}
// All the codes end with an `m`, because reasons.
write!(f, "m")?;
Ok(())
}
/// Write any bytes that go *after* a piece of text to the given writer.
fn write_suffix<W: AnyWrite + ?Sized>(&self, f: &mut W) -> Result<(), W::Error> {
if self.is_plain() {
Ok(())
}
else {
write!(f, "{}", RESET)
}
}
}
/// The code to send to reset all styles and return to `Style::default()`.
pub static RESET: &str = "\x1B[0m";
impl Colour {
fn write_foreground_code<W: AnyWrite + ?Sized>(&self, f: &mut W) -> Result<(), W::Error> {
match *self {
Colour::Black => write!(f, "30"),
Colour::Red => write!(f, "31"),
Colour::Green => write!(f, "32"),
Colour::Yellow => write!(f, "33"),
Colour::Blue => write!(f, "34"),
Colour::Purple => write!(f, "35"),
Colour::Cyan => write!(f, "36"),
Colour::White => write!(f, "37"),
Colour::Fixed(num) => write!(f, "38;5;{}", &num),
Colour::RGB(r,g,b) => write!(f, "38;2;{};{};{}", &r, &g, &b),
}
}
fn write_background_code<W: AnyWrite + ?Sized>(&self, f: &mut W) -> Result<(), W::Error> {
match *self {
Colour::Black => write!(f, "40"),
Colour::Red => write!(f, "41"),
Colour::Green => write!(f, "42"),
Colour::Yellow => write!(f, "43"),
Colour::Blue => write!(f, "44"),
Colour::Purple => write!(f, "45"),
Colour::Cyan => write!(f, "46"),
Colour::White => write!(f, "47"),
Colour::Fixed(num) => write!(f, "48;5;{}", &num),
Colour::RGB(r,g,b) => write!(f, "48;2;{};{};{}", &r, &g, &b),
}
}
}
/// Like `ANSIString`, but only displays the style prefix.
///
/// This type implements the `Display` trait, meaning it can be written to a
/// `std::fmt` formatting without doing any extra allocation, and written to a
/// string with the `.to_string()` method. For examples, see
/// [`Style::prefix`](struct.Style.html#method.prefix).
#[derive(Clone, Copy, Debug)]
pub struct Prefix(Style);
/// Like `ANSIString`, but only displays the difference between two
/// styles.
///
/// This type implements the `Display` trait, meaning it can be written to a
/// `std::fmt` formatting without doing any extra allocation, and written to a
/// string with the `.to_string()` method. For examples, see
/// [`Style::infix`](struct.Style.html#method.infix).
#[derive(Clone, Copy, Debug)]
pub struct Infix(Style, Style);
/// Like `ANSIString`, but only displays the style suffix.
///
/// This type implements the `Display` trait, meaning it can be written to a
/// `std::fmt` formatting without doing any extra allocation, and written to a
/// string with the `.to_string()` method. For examples, see
/// [`Style::suffix`](struct.Style.html#method.suffix).
#[derive(Clone, Copy, Debug)]
pub struct Suffix(Style);
impl Style {
/// The prefix bytes for this style. These are the bytes that tell the
/// terminal to use a different colour or font style.
///
/// # Examples
///
/// ```
/// use ansi_term::{Style, Colour::Blue};
///
/// let style = Style::default().bold();
/// assert_eq!("\x1b[1m",
/// style.prefix().to_string());
///
/// let style = Blue.bold();
/// assert_eq!("\x1b[1;34m",
/// style.prefix().to_string());
///
/// let style = Style::default();
/// assert_eq!("",
/// style.prefix().to_string());
/// ```
pub fn prefix(self) -> Prefix {
Prefix(self)
}
/// The infix bytes between this style and `next` style. These are the bytes
/// that tell the terminal to change the style to `next`. These may include
/// a reset followed by the next colour and style, depending on the two styles.
///
/// # Examples
///
/// ```
/// use ansi_term::{Style, Colour::Green};
///
/// let style = Style::default().bold();
/// assert_eq!("\x1b[32m",
/// style.infix(Green.bold()).to_string());
///
/// let style = Green.normal();
/// assert_eq!("\x1b[1m",
/// style.infix(Green.bold()).to_string());
///
/// let style = Style::default();
/// assert_eq!("",
/// style.infix(style).to_string());
/// ```
pub fn infix(self, next: Style) -> Infix {
Infix(self, next)
}
/// The suffix for this style. These are the bytes that tell the terminal
/// to reset back to its normal colour and font style.
///
/// # Examples
///
/// ```
/// use ansi_term::{Style, Colour::Green};
///
/// let style = Style::default().bold();
/// assert_eq!("\x1b[0m",
/// style.suffix().to_string());
///
/// let style = Green.normal().bold();
/// assert_eq!("\x1b[0m",
/// style.suffix().to_string());
///
/// let style = Style::default();
/// assert_eq!("",
/// style.suffix().to_string());
/// ```
pub fn suffix(self) -> Suffix {
Suffix(self)
}
}
impl Colour {
/// The prefix bytes for this colour as a `Style`. These are the bytes
/// that tell the terminal to use a different colour or font style.
///
/// See also [`Style::prefix`](struct.Style.html#method.prefix).
///
/// # Examples
///
/// ```
/// use ansi_term::Colour::Green;
///
/// assert_eq!("\x1b[0m",
/// Green.suffix().to_string());
/// ```
pub fn prefix(self) -> Prefix {
Prefix(self.normal())
}
/// The infix bytes between this colour and `next` colour. These are the bytes
/// that tell the terminal to use the `next` colour, or to do nothing if
/// the two colours are equal.
///
/// See also [`Style::infix`](struct.Style.html#method.infix).
///
/// # Examples
///
/// ```
/// use ansi_term::Colour::{Red, Yellow};
///
/// assert_eq!("\x1b[33m",
/// Red.infix(Yellow).to_string());
/// ```
pub fn infix(self, next: Colour) -> Infix {
Infix(self.normal(), next.normal())
}
/// The suffix for this colour as a `Style`. These are the bytes that
/// tell the terminal to reset back to its normal colour and font style.
///
/// See also [`Style::suffix`](struct.Style.html#method.suffix).
///
/// # Examples
///
/// ```
/// use ansi_term::Colour::Purple;
///
/// assert_eq!("\x1b[0m",
/// Purple.suffix().to_string());
/// ```
pub fn suffix(self) -> Suffix {
Suffix(self.normal())
}
}
impl fmt::Display for Prefix {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let f: &mut fmt::Write = f;
self.0.write_prefix(f)
}
}
impl fmt::Display for Infix {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use difference::Difference;
match Difference::between(&self.0, &self.1) {
Difference::ExtraStyles(style) => {
let f: &mut fmt::Write = f;
style.write_prefix(f)
},
Difference::Reset => {
let f: &mut fmt::Write = f;
write!(f, "{}{}", RESET, self.1.prefix())
},
Difference::NoDifference => {
Ok(()) // nothing to write
},
}
}
}
impl fmt::Display for Suffix {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let f: &mut fmt::Write = f;
self.0.write_suffix(f)
}
}
#[cfg(test)]
mod test {
use style::Style;
use style::Colour::*;
macro_rules! test {
($name: ident: $style: expr; $input: expr => $result: expr) => {
#[test]
fn $name() {
assert_eq!($style.paint($input).to_string(), $result.to_string());
let mut v = Vec::new();
$style.paint($input.as_bytes()).write_to(&mut v).unwrap();
assert_eq!(v.as_slice(), $result.as_bytes());
}
};
}
test!(plain: Style::default(); "text/plain" => "text/plain");
test!(red: Red; "hi" => "\x1B[31mhi\x1B[0m");
test!(black: Black.normal(); "hi" => "\x1B[30mhi\x1B[0m");
test!(yellow_bold: Yellow.bold(); "hi" => "\x1B[1;33mhi\x1B[0m");
test!(yellow_bold_2: Yellow.normal().bold(); "hi" => "\x1B[1;33mhi\x1B[0m");
test!(blue_underline: Blue.underline(); "hi" => "\x1B[4;34mhi\x1B[0m");
test!(green_bold_ul: Green.bold().underline(); "hi" => "\x1B[1;4;32mhi\x1B[0m");
test!(green_bold_ul_2: Green.underline().bold(); "hi" => "\x1B[1;4;32mhi\x1B[0m");
test!(purple_on_white: Purple.on(White); "hi" => "\x1B[47;35mhi\x1B[0m");
test!(purple_on_white_2: Purple.normal().on(White); "hi" => "\x1B[47;35mhi\x1B[0m");
test!(yellow_on_blue: Style::new().on(Blue).fg(Yellow); "hi" => "\x1B[44;33mhi\x1B[0m");
test!(yellow_on_blue_2: Cyan.on(Blue).fg(Yellow); "hi" => "\x1B[44;33mhi\x1B[0m");
test!(cyan_bold_on_white: Cyan.bold().on(White); "hi" => "\x1B[1;47;36mhi\x1B[0m");
test!(cyan_ul_on_white: Cyan.underline().on(White); "hi" => "\x1B[4;47;36mhi\x1B[0m");
test!(cyan_bold_ul_on_white: Cyan.bold().underline().on(White); "hi" => "\x1B[1;4;47;36mhi\x1B[0m");
test!(cyan_ul_bold_on_white: Cyan.underline().bold().on(White); "hi" => "\x1B[1;4;47;36mhi\x1B[0m");
test!(fixed: Fixed(100); "hi" => "\x1B[38;5;100mhi\x1B[0m");
test!(fixed_on_purple: Fixed(100).on(Purple); "hi" => "\x1B[45;38;5;100mhi\x1B[0m");
test!(fixed_on_fixed: Fixed(100).on(Fixed(200)); "hi" => "\x1B[48;5;200;38;5;100mhi\x1B[0m");
test!(rgb: RGB(70,130,180); "hi" => "\x1B[38;2;70;130;180mhi\x1B[0m");
test!(rgb_on_blue: RGB(70,130,180).on(Blue); "hi" => "\x1B[44;38;2;70;130;180mhi\x1B[0m");
test!(blue_on_rgb: Blue.on(RGB(70,130,180)); "hi" => "\x1B[48;2;70;130;180;34mhi\x1B[0m");
test!(rgb_on_rgb: RGB(70,130,180).on(RGB(5,10,15)); "hi" => "\x1B[48;2;5;10;15;38;2;70;130;180mhi\x1B[0m");
test!(bold: Style::new().bold(); "hi" => "\x1B[1mhi\x1B[0m");
test!(underline: Style::new().underline(); "hi" => "\x1B[4mhi\x1B[0m");
test!(bunderline: Style::new().bold().underline(); "hi" => "\x1B[1;4mhi\x1B[0m");
test!(dimmed: Style::new().dimmed(); "hi" => "\x1B[2mhi\x1B[0m");
test!(italic: Style::new().italic(); "hi" => "\x1B[3mhi\x1B[0m");
test!(blink: Style::new().blink(); "hi" => "\x1B[5mhi\x1B[0m");
test!(reverse: Style::new().reverse(); "hi" => "\x1B[7mhi\x1B[0m");
test!(hidden: Style::new().hidden(); "hi" => "\x1B[8mhi\x1B[0m");
test!(stricken: Style::new().strikethrough(); "hi" => "\x1B[9mhi\x1B[0m");
#[test]
fn test_infix() {
assert_eq!(Style::new().dimmed().infix(Style::new()).to_string(), "\x1B[0m");
assert_eq!(White.dimmed().infix(White.normal()).to_string(), "\x1B[0m\x1B[37m");
assert_eq!(White.normal().infix(White.bold()).to_string(), "\x1B[1m");
assert_eq!(White.normal().infix(Blue.normal()).to_string(), "\x1B[34m");
assert_eq!(Blue.bold().infix(Blue.bold()).to_string(), "");
}
}