Basic feature flag implementation

crates/settings/src/settings.rs

@@ -20,6 +20,7 @@ pub use keymap_file::{keymap_file_json_schema, KeymapFileContent};
 
 #[derive(Clone)]
 pub struct Settings {
+    pub nightly: FeatureFlags,
     pub projects_online_by_default: bool,
     pub buffer_font_family: FamilyId,
     pub default_buffer_font_size: f32,
@@ -38,6 +39,11 @@ pub struct Settings {
     pub theme: Arc<Theme>,
 }
 
+#[derive(Copy, Clone, Debug, Default, Deserialize, JsonSchema)]
+pub struct FeatureFlags {
+    pub modal_terminal: bool,
+}
+
 #[derive(Clone, Debug, Default, Deserialize, JsonSchema)]
 pub struct EditorSettings {
     pub tab_size: Option<NonZeroU32>,
@@ -139,6 +145,8 @@ pub enum WorkingDirectory {
 
 #[derive(Clone, Debug, Default, Deserialize, JsonSchema)]
 pub struct SettingsFileContent {
+    #[serde(default)]
+    pub nightly: Option<FeatureFlags>,
     #[serde(default)]
     pub projects_online_by_default: Option<bool>,
     #[serde(default)]
@@ -189,6 +197,7 @@ impl Settings {
         .unwrap();
 
         Self {
+            nightly: FeatureFlags::default(),
             buffer_font_family: font_cache
                 .load_family(&[defaults.buffer_font_family.as_ref().unwrap()])
                 .unwrap(),
@@ -247,7 +256,7 @@ impl Settings {
         );
         merge(&mut self.vim_mode, data.vim_mode);
         merge(&mut self.autosave, data.autosave);
-
+        merge(&mut self.nightly, data.nightly);
         // Ensure terminal font is loaded, so we can request it in terminal_element layout
         if let Some(terminal_font) = &data.terminal.font_family {
             font_cache.load_family(&[terminal_font]).log_err();
@@ -308,6 +317,7 @@ impl Settings {
     #[cfg(any(test, feature = "test-support"))]
     pub fn test(cx: &gpui::AppContext) -> Settings {
         Settings {
+            nightly: FeatureFlags::default(),
             buffer_font_family: cx.font_cache().load_family(&["Monaco"]).unwrap(),
             buffer_font_size: 14.,
             default_buffer_font_size: 14.,