Extend UserSyntax to allow font_style and font_weight to be specified

Co-Authored-By: Marshall Bowers <1486634+maxdeviant@users.noreply.github.com>

crates/theme2/src/user_theme.rs

@@ -1,4 +1,4 @@
-use gpui::Hsla;
+use gpui::{FontWeight, Hsla};
 use refineable::Refineable;
 use serde::Deserialize;
 
@@ -36,6 +36,39 @@ pub struct UserSyntaxTheme {
 #[derive(Clone, Default, Deserialize)]
 pub struct UserHighlightStyle {
     pub color: Option<Hsla>,
+    pub font_style: Option<UserFontStyle>,
+    pub font_weight: Option<UserFontWeight>,
+}
+
+#[derive(Clone, Default, Deserialize)]
+pub struct UserFontWeight(pub f32);
+
+impl UserFontWeight {
+    /// Thin weight (100), the thinnest value.
+    pub const THIN: Self = Self(FontWeight::THIN.0);
+    /// Extra light weight (200).
+    pub const EXTRA_LIGHT: Self = Self(FontWeight::EXTRA_LIGHT.0);
+    /// Light weight (300).
+    pub const LIGHT: Self = Self(FontWeight::LIGHT.0);
+    /// Normal (400).
+    pub const NORMAL: Self = Self(FontWeight::NORMAL.0);
+    /// Medium weight (500, higher than normal).
+    pub const MEDIUM: Self = Self(FontWeight::MEDIUM.0);
+    /// Semibold weight (600).
+    pub const SEMIBOLD: Self = Self(FontWeight::SEMIBOLD.0);
+    /// Bold weight (700).
+    pub const BOLD: Self = Self(FontWeight::BOLD.0);
+    /// Extra-bold weight (800).
+    pub const EXTRA_BOLD: Self = Self(FontWeight::EXTRA_BOLD.0);
+    /// Black weight (900), the thickest value.
+    pub const BLACK: Self = Self(FontWeight::BLACK.0);
+}
+
+#[derive(Debug, Clone, Copy, Deserialize)]
+pub enum UserFontStyle {
+    Normal,
+    Italic,
+    Oblique,
 }
 
 impl UserHighlightStyle {