feat: syntax highlighting for diff view

src/theme.rs

@@ -1,7 +1,11 @@
 mod catppuccin;
+pub(crate) mod syntax;
 
 use gpui::Rgba;
 
+#[allow(unused_imports)]
+pub use syntax::{HIGHLIGHT_NAMES, ThemeSyntax, ThemeSyntaxHighlight};
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
 pub enum ThemeMode {
     Light,
@@ -15,6 +19,7 @@ pub struct Theme {
     pub name: &'static str,
     pub mode: ThemeMode,
     pub colors: ThemeColors,
+    pub syntax: ThemeSyntax,
 }
 
 impl Default for Theme {
@@ -103,7 +108,7 @@ impl ThemeFamily {
         }
     }
 
-    pub const fn theme(self, mode: ThemeMode) -> Theme {
+    pub fn theme(self, mode: ThemeMode) -> Theme {
         self.variant(mode).theme()
     }
 
@@ -144,7 +149,7 @@ impl ThemeVariant {
         }
     }
 
-    pub const fn theme(self) -> Theme {
+    pub fn theme(self) -> Theme {
         match self {
             | Self::CatppuccinLatte => catppuccin::latte(),
             | Self::CatppuccinMocha => catppuccin::mocha(),