From fff65968bfb30bda31321a832ef2cd67d474cc8f Mon Sep 17 00:00:00 2001
From: Kirill Bulatov <kirill@zed.dev>
Date: Thu, 6 Jul 2023 23:08:04 +0300
Subject: [PATCH] Restart LSP server on initialization options change

---
 crates/project/src/project.rs     | 27 ++++++++++++++++++++++-----
 crates/workspace/src/workspace.rs |  1 +
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/crates/project/src/project.rs b/crates/project/src/project.rs
index d69e5cf21e..81db0c7ed7 100644
--- a/crates/project/src/project.rs
+++ b/crates/project/src/project.rs
@@ -777,20 +777,32 @@ impl Project {
         }
 
         let mut language_servers_to_stop = Vec::new();
+        let mut language_servers_to_restart = Vec::new();
         let languages = self.languages.to_vec();
+        let project_settings = settings::get::<ProjectSettings>(cx).clone();
         for (worktree_id, started_lsp_name) in self.language_server_ids.keys() {
-            let language = languages.iter().find(|l| {
-                l.lsp_adapters()
+            let language = languages.iter().find_map(|l| {
+                let adapter = l
+                    .lsp_adapters()
                     .iter()
-                    .any(|adapter| &adapter.name == started_lsp_name)
+                    .find(|adapter| &adapter.name == started_lsp_name)?;
+                Some((l, adapter))
             });
-            if let Some(language) = language {
+            if let Some((language, adapter)) = language {
                 let worktree = self.worktree_for_id(*worktree_id, cx);
-                let file = worktree.and_then(|tree| {
+                let file = worktree.as_ref().and_then(|tree| {
                     tree.update(cx, |tree, cx| tree.root_file(cx).map(|f| f as _))
                 });
                 if !language_settings(Some(language), file.as_ref(), cx).enable_language_server {
                     language_servers_to_stop.push((*worktree_id, started_lsp_name.clone()));
+                } else if let Some(worktree) = worktree {
+                    let new_lsp_settings = project_settings
+                        .lsp
+                        .get(&adapter.name.0)
+                        .and_then(|s| s.initialization_options.as_ref());
+                    if adapter.initialization_options.as_ref() != new_lsp_settings {
+                        language_servers_to_restart.push((worktree, Arc::clone(language)));
+                    }
                 }
             }
         }
@@ -807,6 +819,11 @@ impl Project {
             self.start_language_servers(&worktree, worktree_path, language, cx);
         }
 
+        // Restart all language servers with changed initialization options.
+        for (worktree, language) in language_servers_to_restart {
+            self.restart_language_servers(worktree, language, cx);
+        }
+
         if !self.copilot_enabled && Copilot::global(cx).is_some() {
             self.copilot_enabled = true;
             for buffer in self.opened_buffers.values() {
diff --git a/crates/workspace/src/workspace.rs b/crates/workspace/src/workspace.rs
index 60aefe4213..01d80d141c 100644
--- a/crates/workspace/src/workspace.rs
+++ b/crates/workspace/src/workspace.rs
@@ -4809,6 +4809,7 @@ mod tests {
             theme::init((), cx);
             language::init(cx);
             crate::init_settings(cx);
+            Project::init_settings(cx);
         });
     }
 }