add option to enable/disable lsp snippets

book/src/configuration.md

@@ -127,6 +127,7 @@ ### `[editor.lsp]` Section
 | `auto-signature-help` | Enable automatic popup of signature help (parameter hints)  | `true`  |
 | `display-inlay-hints` | Display inlay hints[^2]                                     | `false` |
 | `display-signature-help-docs` | Display docs under signature help popup             | `true`  |
+| `snippets`      | Enables snippet completions. Requires a server restart (`:lsp-restart`) to take effect after `:config-reload`/`:set`. | `true`  |
 
 [^1]: By default, a progress spinner is shown in the statusline beside the file path.
 [^2]: You may also have to activate them in the LSP config for them to appear, not just in Helix.

helix-lsp/src/client.rs

@@ -411,7 +411,7 @@ pub fn reply(
     // General messages
     // -------------------------------------------------------------------------------------------
 
-    pub(crate) async fn initialize(&self) -> Result<lsp::InitializeResult> {
+    pub(crate) async fn initialize(&self, enable_snippets: bool) -> Result<lsp::InitializeResult> {
         if let Some(config) = &self.config {
             log::info!("Using custom LSP config: {}", config);
         }
@@ -459,7 +459,7 @@ pub(crate) async fn initialize(&self) -> Result<lsp::InitializeResult> {
                 text_document: Some(lsp::TextDocumentClientCapabilities {
                     completion: Some(lsp::CompletionClientCapabilities {
                         completion_item: Some(lsp::CompletionItemCapability {
-                            snippet_support: Some(true),
+                            snippet_support: Some(enable_snippets),
                             resolve_support: Some(lsp::CompletionItemCapabilityResolveSupport {
                                 properties: vec![
                                     String::from("documentation"),

helix-lsp/src/lib.rs

@@ -647,6 +647,7 @@ pub fn restart(
         language_config: &LanguageConfiguration,
         doc_path: Option<&std::path::PathBuf>,
         root_dirs: &[PathBuf],
+        enable_snippets: bool,
     ) -> Result<Option<Arc<Client>>> {
         let config = match &language_config.language_server {
             Some(config) => config,
@@ -661,8 +662,14 @@ pub fn restart(
                 // initialize a new client
                 let id = self.counter.fetch_add(1, Ordering::Relaxed);
 
-                let NewClientResult(client, incoming) =
+                let NewClientResult(client, incoming) = start_client(
-                    start_client(id, language_config, config, doc_path, root_dirs)?;
+                    id,
+                    language_config,
+                    config,
+                    doc_path,
+                    root_dirs,
+                    enable_snippets,
+                )?;
                 self.incoming.push(UnboundedReceiverStream::new(incoming));
 
                 let old_clients = entry.insert(vec![(id, client.clone())]);
@@ -695,6 +702,7 @@ pub fn get(
         language_config: &LanguageConfiguration,
         doc_path: Option<&std::path::PathBuf>,
         root_dirs: &[PathBuf],
+        enable_snippets: bool,
     ) -> Result<Option<Arc<Client>>> {
         let config = match &language_config.language_server {
             Some(config) => config,
@@ -711,8 +719,14 @@ pub fn get(
         // initialize a new client
         let id = self.counter.fetch_add(1, Ordering::Relaxed);
 
-        let NewClientResult(client, incoming) =
+        let NewClientResult(client, incoming) = start_client(
-            start_client(id, language_config, config, doc_path, root_dirs)?;
+            id,
+            language_config,
+            config,
+            doc_path,
+            root_dirs,
+            enable_snippets,
+        )?;
         clients.push((id, client.clone()));
         self.incoming.push(UnboundedReceiverStream::new(incoming));
         Ok(Some(client))
@@ -811,6 +825,7 @@ fn start_client(
     ls_config: &LanguageServerConfiguration,
     doc_path: Option<&std::path::PathBuf>,
     root_dirs: &[PathBuf],
+    enable_snippets: bool,
 ) -> Result<NewClientResult> {
     let (client, incoming, initialize_notify) = Client::start(
         &ls_config.command,
@@ -834,7 +849,7 @@ fn start_client(
             .capabilities
             .get_or_try_init(|| {
                 _client
-                    .initialize()
+                    .initialize(enable_snippets)
                     .map_ok(|response| response.capabilities)
             })
             .await;

helix-term/src/commands/typed.rs

@@ -1378,9 +1378,12 @@ fn lsp_restart(
         .context("LSP not defined for the current document")?;
 
     let scope = config.scope.clone();
-    cx.editor
+    cx.editor.language_servers.restart(
-        .language_servers
+        config,
-        .restart(config, doc.path(), &editor_config.workspace_lsp_roots)?;
+        doc.path(),
+        &editor_config.workspace_lsp_roots,
+        editor_config.lsp.snippets,
+    )?;
 
     // This collect is needed because refresh_language_server would need to re-borrow editor.
     let document_ids_to_refresh: Vec<DocumentId> = cx

helix-view/src/editor.rs

@@ -352,6 +352,8 @@ pub struct LspConfig {
     pub display_signature_help_docs: bool,
     /// Display inlay hints
     pub display_inlay_hints: bool,
+    /// Whether to enable snippet support
+    pub snippets: bool,
 }
 
 impl Default for LspConfig {
@@ -362,6 +364,7 @@ fn default() -> Self {
             auto_signature_help: true,
             display_signature_help_docs: true,
             display_inlay_hints: false,
+            snippets: true,
         }
     }
 }
@@ -1092,12 +1095,13 @@ fn launch_language_server(&mut self, doc_id: DocumentId) -> Option<()> {
         // if doc doesn't have a URL it's a scratch buffer, ignore it
         let doc = self.document(doc_id)?;
         let (lang, path) = (doc.language.clone(), doc.path().cloned());
-        let root_dirs = &doc.config.load().workspace_lsp_roots;
+        let config = doc.config.load();
+        let root_dirs = &config.workspace_lsp_roots;
 
         // try to find a language server based on the language name
         let language_server = lang.as_ref().and_then(|language| {
             self.language_servers
-                .get(language, path.as_ref(), root_dirs)
+                .get(language, path.as_ref(), root_dirs, config.lsp.snippets)
                 .map_err(|e| {
                     log::error!(
                         "Failed to initialize the LSP for `{}` {{ {} }}",