Merge #3543

3543: Parameter inlay hint separate from variable type inlay? #2876 r=matklad a=slyngbaek

Add setting to allow enabling either type inlay hints or parameter
inlay hints or both. Group the the max inlay hint length option
into the object.

- Add a new type for the inlayHint options.
- Add tests to ensure the inlays don't happen on the server side

Co-authored-by: Steffen Lyngbaek <steffenlyngbaek@gmail.com>

editors/code/src/client.ts

@@ -29,7 +29,7 @@ export async function createClient(config: Config, serverPath: string): Promise<
         initializationOptions: {
             publishDecorations: !config.highlightingSemanticTokens,
             lruCapacity: config.lruCapacity,
-            maxInlayHintLength: config.maxInlayHintLength,
+            inlayHints: config.inlayHints,
             cargoWatchEnable: cargoWatchOpts.enable,
             cargoWatchArgs: cargoWatchOpts.arguments,
             cargoWatchCommand: cargoWatchOpts.command,

editors/code/src/config.ts

@@ -5,6 +5,12 @@ import { log } from "./util";
 
 const RA_LSP_DEBUG = process.env.__RA_LSP_SERVER_DEBUG;
 
+export interface InlayHintOptions {
+    typeHints: boolean;
+    parameterHints: boolean;
+    maxLength: number | null;
+}
+
 export interface CargoWatchOptions {
     enable: boolean;
     arguments: string[];
@@ -22,7 +28,8 @@ export class Config {
     private static readonly requiresReloadOpts = [
         "cargoFeatures",
         "cargo-watch",
-        "highlighting.semanticTokens"
+        "highlighting.semanticTokens",
+        "inlayHints",
     ]
         .map(opt => `${Config.rootSection}.${opt}`);
 
@@ -149,8 +156,13 @@ export class Config {
     get highlightingOn() { return this.cfg.get("highlightingOn") as boolean; }
     get rainbowHighlightingOn() { return this.cfg.get("rainbowHighlightingOn") as boolean; }
     get lruCapacity() { return this.cfg.get("lruCapacity") as null | number; }
-    get displayInlayHints() { return this.cfg.get("displayInlayHints") as boolean; }
-    get maxInlayHintLength() { return this.cfg.get("maxInlayHintLength") as number; }
+    get inlayHints(): InlayHintOptions {
+        return {
+            typeHints: this.cfg.get("inlayHints.typeHints") as boolean,
+            parameterHints: this.cfg.get("inlayHints.parameterHints") as boolean,
+            maxLength: this.cfg.get("inlayHints.maxLength") as null | number,
+        };
+    }
     get excludeGlobs() { return this.cfg.get("excludeGlobs") as string[]; }
     get useClientWatching() { return this.cfg.get("useClientWatching") as boolean; }
     get featureFlags() { return this.cfg.get("featureFlags") as Record<string, boolean>; }

editors/code/src/inlay_hints.ts

@@ -10,7 +10,7 @@ export function activateInlayHints(ctx: Ctx) {
     const maybeUpdater = {
         updater: null as null | HintsUpdater,
         onConfigChange() {
-            if (!ctx.config.displayInlayHints) {
+            if (!ctx.config.inlayHints.typeHints && !ctx.config.inlayHints.parameterHints) {
                 return this.dispose();
             }
             if (!this.updater) this.updater = new HintsUpdater(ctx);