Implement stop and start server commands

Author: Veykril

editors/code/package.json

@@ -60,6 +60,7 @@
         "onCommand:rust-analyzer.analyzerStatus",
         "onCommand:rust-analyzer.memoryUsage",
         "onCommand:rust-analyzer.reloadWorkspace",
+        "onCommand:rust-analyzer.startServer",
         "workspaceContains:*/Cargo.toml",
         "workspaceContains:*/rust-project.json"
     ],
@@ -191,6 +192,16 @@
                 "title": "Restart server",
                 "category": "rust-analyzer"
             },
+            {
+                "command": "rust-analyzer.startServer",
+                "title": "Start server",
+                "category": "rust-analyzer"
+            },
+            {
+                "command": "rust-analyzer.stopServer",
+                "title": "Stop server",
+                "category": "rust-analyzer"
+            },
             {
                 "command": "rust-analyzer.onEnter",
                 "title": "Enhanced enter key",

editors/code/src/client.ts

@@ -76,6 +76,14 @@ export async function createClient(
         outputChannel,
         middleware: {
             workspace: {
+                // HACK: This is a workaround, when the client has been disposed, VSCode
+                // continues to emit events to the client and the default one for this event
+                // attempt to restart the client for no reason
+                async didChangeWatchedFile(event, next) {
+                    if (client.isRunning()) {
+                        await next(event);
+                    }
+                },
                 async configuration(
                     params: lc.ConfigurationParams,
                     token: vscode.CancellationToken,

editors/code/src/ctx.ts

@@ -68,8 +68,6 @@ export class Ctx {
         }
 
         if (!this.client) {
-            log.info("Creating language client");
-
             this._serverPath = await bootstrap(this.extCtx, this.config, this.state).catch(
                 (err) => {
                     let message = "bootstrap error. ";

editors/code/src/main.ts

@@ -126,6 +126,13 @@ async function initCommonContext(ctx: Ctx) {
         await ctx.activate();
     });
 
+    ctx.registerCommand("startServer", (_) => async () => {
+        await ctx.activate();
+    });
+    ctx.registerCommand("stopServer", (_) => async () => {
+        // FIXME: We should re-use the client, that is ctx.deactivate() if none of the configs have changed
+        await ctx.disposeClient();
+    });
     ctx.registerCommand("analyzerStatus", commands.analyzerStatus);
     ctx.registerCommand("memoryUsage", commands.memoryUsage);
     ctx.registerCommand("shuffleCrateGraph", commands.shuffleCrateGraph);