Add VSCode extension for BSP server log streaming (#113)

* Add VSCode extension for SourceKit Bazel BSP

Introduces a TypeScript-based VSCode extension that integrates with
the SourceKit Bazel BSP server. Includes basic extension scaffolding,
logger utility, and build configuration.

* Remove extension logger setup

Author: joshua-arnold

.github/workflows/ci.yaml

@@ -39,6 +39,11 @@ jobs:
         run: |
           cd Example
           bazelisk test //HelloWorld:HelloWorldTests
+      - name: Build VSCode extension
+        run: |
+          cd vscode-extension
+          npm install
+          npm run compile
       - name: Build release source archive
         run: make release_source_archive
       - uses: actions/upload-artifact@v4

vscode-extension/.gitignore

@@ -0,0 +1,4 @@
+node_modules/
+out/
+*.vsix
+

vscode-extension/.vscode/launch.json

@@ -0,0 +1,13 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Run Extension",
+            "type": "extensionHost",
+            "request": "launch",
+            "args": ["--extensionDevelopmentPath=${workspaceFolder}"],
+            "outFiles": ["${workspaceFolder}/out/**/*.js"],
+            "preLaunchTask": "npm: compile"
+        }
+    ]
+}

vscode-extension/.vscode/tasks.json

@@ -0,0 +1,22 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "type": "npm",
+            "script": "compile",
+            "problemMatcher": "$tsc",
+            "label": "npm: compile",
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
+        },
+        {
+            "type": "npm",
+            "script": "watch",
+            "problemMatcher": "$tsc-watch",
+            "label": "npm: watch",
+            "isBackground": true
+        }
+    ]
+}

vscode-extension/.vscodeignore

@@ -0,0 +1,7 @@
+.vscode/**
+src/**
+tsconfig.json
+**/*.ts
+**/*.map
+node_modules/**
+

vscode-extension/README.md

@@ -0,0 +1,11 @@
+# VSCode Extension
+
+This is an early WIP VSCode extension. It has the goal of enabling support for functionality such as:
+
+-   [ ] (Cursor / VSCode): Automatic generation of build, launch, and debug tasks
+
+-   [ ] (Cursor / VSCode): Test explorer & ability to run tests from within the IDE by clicking the tests individually, similarly to Xcode
+
+-   [ ] Automatic index and build graph updates when adding / deleting files and targets (in other words, allowing the user to make heavy changes to the project without needing to restart the IDE)
+
+The extension is in active development and is not yet ready for use.

vscode-extension/package-lock.json

@@ -0,0 +1,32 @@
+{
+    "name": "sourcekit-bazel-bsp",
+    "displayName": "SourceKit Bazel BSP",
+    "description": "Companion extension for sourcekit-bazel-bsp",
+    "version": "0.0.1",
+    "publisher": "spotify",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/spotify/sourcekit-bazel-bsp"
+    },
+    "engines": {
+        "vscode": "^1.85.0"
+    },
+    "categories": [
+        "Programming Languages"
+    ],
+    "activationEvents": [
+        "onStartupFinished"
+    ],
+    "main": "./out/extension.js",
+    "contributes": {},
+    "scripts": {
+        "vscode:prepublish": "npm run compile",
+        "compile": "tsc -p ./",
+        "watch": "tsc -watch -p ./"
+    },
+    "devDependencies": {
+        "@types/vscode": "^1.85.0",
+        "@types/node": "^20.0.0",
+        "typescript": "^5.3.0"
+    }
+}

vscode-extension/package.json

@@ -0,0 +1,28 @@
+// Copyright (c) 2025 Spotify AB.
+//
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+import { log } from "./logger";
+
+export function activate() {
+    log("Extension activated ✅");
+}
+
+export function deactivate() {
+    log("Extension deactivated ❌");
+}

vscode-extension/src/extension.ts

@@ -0,0 +1,26 @@
+// Copyright (c) 2025 Spotify AB.
+//
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+import * as vscode from "vscode";
+
+const outputChannel = vscode.window.createOutputChannel("SourceKit Bazel BSP");
+
+export function log(message: string) {
+    outputChannel.appendLine(message);
+}