[release] src/goMain: Add a command to copy to gopls output channel to an editor window

Intended to be used to make looking through the gopls output channel
easier than when it is just in a panel.

There doesn't seem to be a straightforward way to give it a sensible name.

It would be nice to make the Error popup go away after some period of
time.

Change-Id: I954d6bae13b7dcefd715fac23f41a0f28a0a6a28
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/263526
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Trust: Hyang-Ah Hana Kim <hyangah@gmail.com>
Trust: Peter Weinberger <pjw@google.com>
(cherry picked from commit 6f8699c)
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/266578
Reviewed-by: Peter Weinberger <pjw@google.com>
Run-TryBot: Peter Weinberger <pjw@google.com>

Author: pjweinbgo

docs/commands.md

@@ -91,6 +91,10 @@ Generates unit tests for the selected function in the current file
 
 Generates method stub for implementing the provided interface and inserts at the cursor.
 
+### `Go: extract server output channel to editor`
+
+Show the gopls (server) output channel in the editor.
+
 ### `Go: Toggle gc details`
 
 Toggle the display of compiler optimization choices

package.json

@@ -242,6 +242,11 @@
         "title": "Go: Generate Interface Stubs",
         "description": "Generates method stub for implementing the provided interface and inserts at the cursor."
       },
+      {
+        "command": "go.extractServerChannel",
+        "title": "Go: extract server output channel to editor",
+        "description": "Show the gopls (server) output channel in the editor."
+      },
       {
         "command": "go.toggle.gc_details",
         "title": "Go: Toggle gc details",

src/goLanguageServer.ts

@@ -1147,7 +1147,7 @@ function daysBetween(a: Date, b: Date): number {
 	return msBetween(a, b) / timeDay;
 }
 
-// minutesBetween returns the number of days between a and b.
+// minutesBetween returns the number of minutes between a and b.
 function minutesBetween(a: Date, b: Date): number {
 	return msBetween(a, b) / timeMinute;
 }
@@ -1156,6 +1156,34 @@ function msBetween(a: Date, b: Date): number {
 	return Math.abs(a.getTime() - b.getTime());
 }
 
+export function showServerOutputChannel() {
+	if (!languageServerIsRunning) {
+		vscode.window.showInformationMessage(`gopls is not running`);
+		return;
+	}
+	// likely show() is asynchronous, despite the documentation
+	serverOutputChannel.show();
+	let found: vscode.TextDocument;
+	for (const doc of vscode.workspace.textDocuments) {
+		if (doc.fileName.indexOf('extension-output-') !== -1) {
+			// despite show() above, this might not get the output we want, so check
+			const contents = doc.getText();
+			if (contents.indexOf('[Info  - ') === -1) {
+				continue;
+			}
+			if (found !== undefined) {
+				vscode.window.showInformationMessage('multiple docs named extension-output-...');
+			}
+			found = doc;
+			// .log, as some decoration is better than none
+			vscode.workspace.openTextDocument({language: 'log', content: contents});
+		}
+	}
+	if (found === undefined) {
+		vscode.window.showErrorMessage('make sure "gopls (server)" output is showing');
+	}
+}
+
 function collectGoplsLog(): string {
 	serverOutputChannel.show();
 	// Find the logs in the output channel. There is no way to read

src/goMain.ts

@@ -33,10 +33,9 @@ import {
 } from './goInstallTools';
 import {
 	languageServerIsRunning,
-	promptForLanguageServerDefaultChange,
-	resetSurveyConfig,
-	showSurveyConfig,
-	startLanguageServerWithFallback, watchLanguageServerConfiguration
+	promptForLanguageServerDefaultChange, resetSurveyConfig, showServerOutputChannel,
+	showSurveyConfig, startLanguageServerWithFallback,
+	watchLanguageServerConfiguration
 } from './goLanguageServer';
 import { lintCode } from './goLint';
 import { logVerbose, setLogConfig } from './goLogging';
@@ -452,6 +451,10 @@ export function activate(ctx: vscode.ExtensionContext) {
 
 	ctx.subscriptions.push(vscode.commands.registerCommand('go.install.package', installCurrentPackage));
 
+	ctx.subscriptions.push(vscode.commands.registerCommand('go.extractServerChannel', () => {
+		showServerOutputChannel();
+	}));
+
 	ctx.subscriptions.push(vscode.commands.registerCommand('go.toggle.gc_details', () => {
 		if (!languageServerIsRunning) {
 			vscode.window.showErrorMessage('"Go: Toggle gc details" command is available only when the language server is running');