languages: Fix semantic tokens for Go (#51621)

Finn Eitreim created 3 weeks ago

Closes #51620

gopls requires more specific initialization for semantic tokens that
other language-servers for reasons that aren't entirely clear to me, it
is however a small fix to make it work. still trying to track down other
malfunctioning language servers in the semantic token realm, so if you
have suggestions let me know.

original behavior (on nightly v0.229):
<img width="1784" height="1123" alt="nightly_behavior"
src="https://github.com/user-attachments/assets/5d976b34-2720-425c-8617-800291862909"
/>

updated behavior:
<img width="1784" height="1124" alt="fix_applied"
src="https://github.com/user-attachments/assets/17c528b9-fea8-4309-9306-44673afc9fc3"
/>

Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- gopls: fixed semantic token support with gopls.

Change summary

crates/languages/src/go.rs | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)

Detailed changes

crates/languages/src/go.rs

@@ -5,7 +5,10 @@ use futures::StreamExt;
 use gpui::{App, AsyncApp, Task};
 use http_client::github::latest_github_release;
 pub use language::*;
-use language::{LanguageToolchainStore, LspAdapterDelegate, LspInstaller};
+use language::{
+    LanguageName, LanguageToolchainStore, LspAdapterDelegate, LspInstaller,
+    language_settings::language_settings,
+};
 use lsp::{LanguageServerBinary, LanguageServerName};
 
 use project::lsp_store::language_server_settings;
@@ -207,6 +210,12 @@ impl LspAdapter for GoLspAdapter {
         delegate: &Arc<dyn LspAdapterDelegate>,
         cx: &mut AsyncApp,
     ) -> Result<Option<serde_json::Value>> {
+        let semantic_tokens_enabled = cx.update(|cx| {
+            language_settings(Some(LanguageName::new("Go")), None, cx)
+                .semantic_tokens
+                .enabled()
+        });
+
         let mut default_config = json!({
             "usePlaceholders": false,
             "hints": {
@@ -217,7 +226,8 @@ impl LspAdapter for GoLspAdapter {
                 "functionTypeParameters": true,
                 "parameterNames": true,
                 "rangeVariableTypes": true
-            }
+            },
+            "semanticTokens": semantic_tokens_enabled
         });
 
         let project_initialization_options = cx.update(|cx| {