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|
use std::ops::FnMut;
use ansi_term::{Colour, Style};
use ansi_term::Colour::*;
// Parsing the LS_COLORS environment variable into a map of names to Style values.
//
// This is sitting around undocumented at the moment because it’s a feature
// that should really be unnecessary! exa highlights its output by creating a
// theme of one Style value per part of the interface that can be coloured,
// then reading styles from that theme. The LS_COLORS variable, on the other
// hand, can contain arbitrary characters that ls is supposed to add to the
// output, without needing to know what they actually do. This puts exa in the
// annoying position of having to parse the ANSI escape codes _back_ into
// Style values before it’s able to use them. Doing this has a lot of
// downsides: if a new terminal feature is added with its own code, exa won’t
// be able to use this without explicit support for parsing the feature, while
// ls would not even need to know it existed. And there are some edge cases in
// ANSI codes, where terminals would accept codes exa is strict about it. It’s
// just not worth doing, and there should really be a way to just use slices
// of the LS_COLORS string without having to parse them.
pub struct LSColors<'var>(pub &'var str);
impl<'var> LSColors<'var> {
pub fn each_pair<C>(&mut self, mut callback: C) where C: FnMut(Pair<'var>) -> () {
for next in self.0.split(':') {
let bits = next.split('=')
.take(3)
.collect::<Vec<_>>();
if bits.len() == 2 && !bits[0].is_empty() && !bits[1].is_empty() {
callback(Pair { key: bits[0], value: bits[1] });
}
}
}
}
pub struct Pair<'var> {
pub key: &'var str,
pub value: &'var str,
}
use std::iter::Peekable;
fn parse_into_high_colour<'a, I>(iter: &mut Peekable<I>) -> Option<Colour>
where I: Iterator<Item=&'a str> {
match iter.peek() {
Some(&"5") => {
let _ = iter.next();
if let Some(byte) = iter.next() {
if let Ok(num) = byte.parse() {
return Some(Fixed(num));
}
}
}
Some(&"2") => {
let _ = iter.next();
if let Some(hexes) = iter.next() {
// Some terminals support R:G:B instead of R;G;B
// but this clashes with splitting on ':' in each_pair above.
/*if hexes.contains(':') {
let rgb = hexes.splitn(3, ':').collect::<Vec<_>>();
if rgb.len() != 3 {
return None;
}
else if let (Ok(r), Ok(g), Ok(b)) = (rgb[0].parse(), rgb[1].parse(), rgb[2].parse()) {
return Some(RGB(r, g, b));
}
}*/
if let (Some(r), Some(g), Some(b)) = (hexes.parse().ok(),
iter.next().and_then(|s| s.parse().ok()),
iter.next().and_then(|s| s.parse().ok())) {
return Some(RGB(r, g, b));
}
}
}
_ => {},
}
None
}
impl<'var> Pair<'var> {
pub fn to_style(&self) -> Style {
let mut style = Style::default();
let mut iter = self.value.split(';').peekable();
while let Some(num) = iter.next() {
match num.trim_start_matches('0') {
// Bold and italic
"1" => style = style.bold(),
"2" => style = style.dimmed(),
"3" => style = style.italic(),
"4" => style = style.underline(),
"5" => style = style.blink(),
// 6 is supposedly a faster blink
"7" => style = style.reverse(),
"8" => style = style.hidden(),
"9" => style = style.strikethrough(),
// Foreground colours
"30" => style = style.fg(Black),
"31" => style = style.fg(Red),
"32" => style = style.fg(Green),
"33" => style = style.fg(Yellow),
"34" => style = style.fg(Blue),
"35" => style = style.fg(Purple),
"36" => style = style.fg(Cyan),
"37" => style = style.fg(White),
"38" => if let Some(c) = parse_into_high_colour(&mut iter) { style = style.fg(c) },
// Background colours
"40" => style = style.on(Black),
"41" => style = style.on(Red),
"42" => style = style.on(Green),
"43" => style = style.on(Yellow),
"44" => style = style.on(Blue),
"45" => style = style.on(Purple),
"46" => style = style.on(Cyan),
"47" => style = style.on(White),
"48" => if let Some(c) = parse_into_high_colour(&mut iter) { style = style.on(c) },
_ => {/* ignore the error and do nothing */},
}
}
style
}
}
#[cfg(test)]
mod ansi_test {
use super::*;
use ansi_term::Style;
macro_rules! test {
($name:ident: $input:expr => $result:expr) => {
#[test]
fn $name() {
assert_eq!(Pair { key: "", value: $input }.to_style(), $result);
}
};
}
// Styles
test!(bold: "1" => Style::default().bold());
test!(bold2: "01" => Style::default().bold());
test!(under: "4" => Style::default().underline());
test!(unde2: "04" => Style::default().underline());
test!(both: "1;4" => Style::default().bold().underline());
test!(both2: "01;04" => Style::default().bold().underline());
test!(fg: "31" => Red.normal());
test!(bg: "43" => Style::default().on(Yellow));
test!(bfg: "31;43" => Red.on(Yellow));
test!(bfg2: "0031;0043" => Red.on(Yellow));
test!(all: "43;31;1;4" => Red.on(Yellow).bold().underline());
test!(again: "1;1;1;1;1" => Style::default().bold());
// Failure cases
test!(empty: "" => Style::default());
test!(semis: ";;;;;;" => Style::default());
test!(nines: "99999999" => Style::default());
test!(word: "GREEN" => Style::default());
// Higher colours
test!(hifg: "38;5;149" => Fixed(149).normal());
test!(hibg: "48;5;1" => Style::default().on(Fixed(1)));
test!(hibo: "48;5;1;1" => Style::default().on(Fixed(1)).bold());
test!(hiund: "4;48;5;1" => Style::default().on(Fixed(1)).underline());
test!(rgb: "38;2;255;100;0" => Style::default().fg(RGB(255, 100, 0)));
test!(rgbi: "38;2;255;100;0;3" => Style::default().fg(RGB(255, 100, 0)).italic());
test!(rgbbg: "48;2;255;100;0" => Style::default().on(RGB(255, 100, 0)));
test!(rgbbi: "48;2;255;100;0;3" => Style::default().on(RGB(255, 100, 0)).italic());
test!(fgbg: "38;5;121;48;5;212" => Fixed(121).on(Fixed(212)));
test!(bgfg: "48;5;121;38;5;212" => Fixed(212).on(Fixed(121)));
test!(toohi: "48;5;999" => Style::default());
}
#[cfg(test)]
mod test {
use super::*;
macro_rules! test {
($name:ident: $input:expr => $result:expr) => {
#[test]
fn $name() {
let mut lscs = Vec::new();
LSColors($input).each_pair(|p| lscs.push( (p.key.clone(), p.to_style()) ));
assert_eq!(lscs, $result.to_vec());
}
};
}
// Bad parses
test!(empty: "" => []);
test!(jibber: "blah" => []);
test!(equals: "=" => []);
test!(starts: "=di" => []);
test!(ends: "id=" => []);
// Foreground colours
test!(green: "cb=32" => [ ("cb", Green.nor
|
