settings.json: Suggest font names for buffer_font_family

crates/gpui/src/text_system.rs

@@ -65,6 +65,9 @@ impl TextSystem {
         }
     }
 
+    pub fn all_font_families(&self) -> Vec<String> {
+        self.platform_text_system.all_font_families()
+    }
     pub fn add_fonts(&self, fonts: &[Arc<Vec<u8>>]) -> Result<()> {
         self.platform_text_system.add_fonts(fonts)
     }

crates/theme/src/settings.rs

@@ -194,9 +194,21 @@ impl settings::Settings for ThemeSettings {
             ..Default::default()
         };
 
-        root_schema
+        let available_fonts = cx
-            .definitions
+            .text_system()
-            .extend([("ThemeName".into(), theme_name_schema.into())]);
+            .all_font_families()
+            .into_iter()
+            .map(Value::String)
+            .collect();
+        let fonts_schema = SchemaObject {
+            instance_type: Some(InstanceType::String.into()),
+            enum_values: Some(available_fonts),
+            ..Default::default()
+        };
+        root_schema.definitions.extend([
+            ("ThemeName".into(), theme_name_schema.into()),
+            ("FontFamilies".into(), fonts_schema.into()),
+        ]);
 
         root_schema
             .schema
@@ -204,10 +216,16 @@ impl settings::Settings for ThemeSettings {
             .as_mut()
             .unwrap()
             .properties
-            .extend([(
+            .extend([
+                (
                     "theme".to_owned(),
                     Schema::new_ref("#/definitions/ThemeName".into()),
-            )]);
+                ),
+                (
+                    "buffer_font_family".to_owned(),
+                    Schema::new_ref("#/definitions/FontFamilies".into()),
+                ),
+            ]);
 
         root_schema
     }