Introduce style strings to replace color options

https://git-scm.com/docs/git-config#Documentation/git-config.txt-color

- Support "syntax" pseudo foreground color
- Delete the --syntax-highlight CLI option
  This was never released.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/style.rs b/src/style.rs
index 80256805..339e3f02 100644
--- a/src/style.rs
+++ b/src/style.rs
@@ -170,6 +170,18 @@ const DARK_THEME_PLUS_EMPH_COLOR_256: Color = Color {
 /// A special color to specify that no color escape codes should be emitted.
 pub const NO_COLOR: Color = Color::BLACK;
 
+/// A special color value to signify that the foreground color of a style should be derived from
+/// syntax highlighting.
+// alpha is 0, which is how the 256-palette colors are encoded (see bat::terminal::to_ansi_color).
+// So if painted, this would be black. However, the presence of a non-zero bit in the blue channel
+// distinguishes this from any 256-palette color.
+pub const SYNTAX_HIGHLIGHTING_COLOR: Color = Color {
+    r: 0x00,
+    g: 0x00,
+    b: 0x01,
+    a: 0x00,
+};
+
 pub fn get_no_style() -> Style {
     Style {
         foreground: NO_COLOR,