Add settings to control when to open the build output

Signed-off-by: Sheng Chen <sheche@microsoft.com>

extension/package.json

@@ -837,6 +837,21 @@
           ],
           "markdownDescription": "[Experimental] Use build server to synchronize Gradle project when enabled. When set to `auto`, the build server will be enabled in Visual Studio Code - Insiders.",
           "default": "auto"
+        },
+        "java.gradle.buildServer.openBuildOutput": {
+          "type": "string",
+          "enum": [
+            "neverOpen",
+            "openOnBuildStart",
+            "openOnBuildFailure"
+          ],
+          "enumDescriptions": [
+            "Never automatically open build output.",
+            "Open the build output when the build starts.",
+            "Open the build output when the build fails."
+          ],
+          "default": "openOnBuildFailure",
+          "description": "Controls when the build output should open."
         }
       }
     },

extension/src/bs/BuildServerController.ts

@@ -1,6 +1,7 @@
 import { Disposable, ExtensionContext, OutputChannel, commands, languages, window } from "vscode";
 import { GradleBuildLinkProvider } from "./GradleBuildLinkProvider";
 import { sendInfo } from "vscode-extension-telemetry-wrapper";
+import { OpenBuildOutputValue, getOpenBuildOutput } from "../util/config";
 
 const APPEND_BUILD_LOG_CMD = "_java.gradle.buildServer.appendBuildLog";
 const LOG_CMD = "_java.gradle.buildServer.log";
@@ -23,7 +24,16 @@ export class BuildServerController implements Disposable {
             commands.registerCommand(APPEND_BUILD_LOG_CMD, (msg: string) => {
                 if (msg) {
                     this.buildOutputChannel.appendLine(msg);
-                    if (/^BUILD (SUCCESSFUL|FAILED)/m.test(msg)) {
+                    const openBehavior: OpenBuildOutputValue = getOpenBuildOutput();
+                    if (openBehavior === OpenBuildOutputValue.NEVER) {
+                        return;
+                    }
+
+                    const pattern =
+                        openBehavior === OpenBuildOutputValue.ON_BUILD_START
+                            ? /^> Build starts at /m
+                            : /^BUILD FAILED/m;
+                    if (pattern.test(msg)) {
                         this.buildOutputChannel.show(true);
                     }
                 }

extension/src/util/config.ts

@@ -114,6 +114,18 @@ export function getAllowParallelRun(): boolean {
     return vscode.workspace.getConfiguration("gradle").get<boolean>("allowParallelRun", false);
 }
 
+export function getOpenBuildOutput(): OpenBuildOutputValue {
+    return vscode.workspace
+        .getConfiguration("java.gradle.buildServer")
+        .get<OpenBuildOutputValue>("openBuildOutput", OpenBuildOutputValue.ON_BUILD_FAILURE);
+}
+
+export enum OpenBuildOutputValue {
+    NEVER = "neverOpen",
+    ON_BUILD_START = "openOnBuildStart",
+    ON_BUILD_FAILURE = "openOnBuildFailure",
+}
+
 export enum ProjectOpenBehaviourValue {
     INTERACTIVE = "Interactive",
     OPEN = "Open",