package.json: add gopls.start_debugging

This command invokes the gopls command that starts its
internal debugging web server (and requests that the
client open the web page).

I used the terms "language server" instead of gopls,
and "maintainer interface" instead of debug server
since "debug" has a different conntation in the VS Code UI.

Tested manually.

Change-Id: I9fe5d90f095ef3eed4ea2c1a7ba42117ceb002a2
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/506516
Run-TryBot: Alan Donovan <adonovan@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Auto-Submit: Alan Donovan <adonovan@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>

docs/commands.md

@@ -159,6 +159,10 @@ Toggles between file in current active editor and the corresponding test file.
 
 Toggle the display of vulnerability analysis in dependencies.
 
+### `Go: Start language server's maintainer interface`
+
+Start the Go language server's maintainer interface (a web server).
+
 ### `Go: Add Tags To Struct Fields`
 
 Add tags configured in go.addTags setting to selected struct using gomodifytags

package.json

@@ -397,6 +397,11 @@
         "title": "Go: Toggle Vulncheck",
         "description": "Toggle the display of vulnerability analysis in dependencies."
       },
+      {
+        "command": "go.languageserver.maintain",
+        "title": "Go: Start language server's maintainer interface",
+        "description": "Start the Go language server's maintainer interface (a web server)."
+      },
       {
         "command": "go.add.tags",
         "title": "Go: Add Tags To Struct Fields",

src/commands/index.ts

@@ -21,6 +21,7 @@ export { runBuilds } from './runBuilds';
 export { showCommands } from './showCommands';
 export { startDebugSession } from './startDebugSession';
 export { startLanguageServer } from './startLanguageServer';
+export { startGoplsMaintainerInterface } from './startLanguageServer';
 export { toggleGCDetails } from './toggleGCDetails';
 
 type CommandCallback<T extends unknown[]> = (...args: T) => Promise<unknown> | unknown;

src/commands/startLanguageServer.ts

@@ -138,3 +138,19 @@ function shouldActivateLanguageFeatures() {
 	}
 	return true;
 }
+
+export const startGoplsMaintainerInterface: CommandFactory = (ctx, goCtx) => {
+	return () => {
+		if (!goCtx.languageServerIsRunning) {
+			vscode.window.showErrorMessage(
+				'"Go: Start language server\'s maintainer interface" command is available only when the language server is running'
+			);
+			return;
+		}
+		vscode.commands.executeCommand('gopls.start_debugging', {}).then(undefined, (reason) => {
+			vscode.window.showErrorMessage(
+				`"Go: Start language server's maintainer interface" command failed: ${reason}`
+			);
+		});
+	};
+};

src/goMain.ts

@@ -103,6 +103,7 @@ export async function activate(ctx: vscode.ExtensionContext): Promise<ExtensionA
 
 	const registerCommand = commands.createRegisterCommand(ctx, goCtx);
 	registerCommand('go.languageserver.restart', commands.startLanguageServer);
+	registerCommand('go.languageserver.maintain', commands.startGoplsMaintainerInterface);
 
 	await commands.startLanguageServer(ctx, goCtx)(RestartReason.ACTIVATION);