Fix incomplete language names list being used for JSON schema

For now, since initializing the languages themselves is still async,
create a parallel duplicated code path that is synchronous, and
just provided the language names.

crates/settings/src/settings.rs

@@ -248,7 +248,7 @@ impl Settings {
 
 pub fn settings_file_json_schema(
     theme_names: Vec<String>,
-    language_names: Vec<String>,
+    language_names: &[String],
 ) -> serde_json::Value {
     let settings = SchemaSettings::draft07().with(|settings| {
         settings.option_add_null_type = false;
@@ -275,8 +275,13 @@ pub fn settings_file_json_schema(
         instance_type: Some(SingleOrVec::Single(Box::new(InstanceType::Object))),
         object: Some(Box::new(ObjectValidation {
             properties: language_names
-                .into_iter()
-                .map(|name| (name, Schema::new_ref("#/definitions/EditorSettings".into())))
+                .iter()
+                .map(|name| {
+                    (
+                        name.clone(),
+                        Schema::new_ref("#/definitions/EditorSettings".into()),
+                    )
+                })
                 .collect(),
             ..Default::default()
         })),

crates/zed/src/languages.rs

@@ -1,5 +1,6 @@
 use gpui::executor::Background;
 pub use language::*;
+use lazy_static::lazy_static;
 use rust_embed::RustEmbed;
 use std::{borrow::Cow, str, sync::Arc};
 
@@ -17,6 +18,21 @@ mod typescript;
 #[exclude = "*.rs"]
 struct LanguageDir;
 
+// TODO - Remove this once the `init` function is synchronous again.
+lazy_static! {
+    pub static ref LANGUAGE_NAMES: Vec<String> = LanguageDir::iter()
+        .filter_map(|path| {
+            if path.ends_with("config.toml") {
+                let config = LanguageDir::get(&path)?;
+                let config = toml::from_slice::<LanguageConfig>(&config.data).ok()?;
+                Some(config.name.to_string())
+            } else {
+                None
+            }
+        })
+        .collect();
+}
+
 pub async fn init(languages: Arc<LanguageRegistry>, _executor: Arc<Background>) {
     for (name, grammar, lsp_adapter) in [
         (

crates/zed/src/zed.rs

@@ -209,7 +209,7 @@ pub fn initialize_workspace(
     cx.emit(workspace::Event::PaneAdded(workspace.active_pane().clone()));
 
     let theme_names = app_state.themes.list().collect();
-    let language_names = app_state.languages.language_names();
+    let language_names = &languages::LANGUAGE_NAMES;
 
     workspace.project().update(cx, |project, cx| {
         let action_names = cx.all_action_names().collect::<Vec<_>>();