256 colour support in ls_colors

This is more annoying than it should be because it has to work with Styles rather than with strings, which means parsing them, and parsing is always tricky business.

src/style/lsc.rs

@@ -1,6 +1,6 @@
 use std::ops::FnMut;
 
-use ansi_term::Style;
+use ansi_term::{Colour, Style};
 use ansi_term::Colour::*;
 
 
@@ -25,11 +25,30 @@ pub struct Pair<'var> {
     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 _5 = iter.next();
+            if let Some(byte) = iter.next() {
+                if let Ok(num) = byte.parse() {
+                    return Some(Fixed(num));
+                }
+            }
+        }
+        _ => {},
+    }
+
+    None
+}
+
 impl<'var> Pair<'var> {
     pub fn to_style(&self) -> Style {
         let mut style = Style::default();
+        let mut iter = self.value.split(";").peekable();
 
-        for num in self.value.split(";") {
+        while let Some(num) = iter.next() {
             match num {
 
                 // Bold and italic
@@ -45,6 +64,7 @@ impl<'var> Pair<'var> {
                 "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),
@@ -55,6 +75,8 @@ impl<'var> Pair<'var> {
                 "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 */},
             }
         }
@@ -93,6 +115,16 @@ mod ansi_test {
     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!(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());
 }