Run and Debug zig program and tests

README.md

@@ -13,6 +13,8 @@
 - syntax highlighting
 - basic compiler linting
 - automatic formatting
+- Run/Debug zig program
+- Run/Debug tests
 - optional [Zig Language Server](https://github.com/zigtools/zls) features
   - completions
   - goto definition/declaration

package.json

@@ -312,6 +312,18 @@
       }
     },
     "commands": [
+      {
+        "command": "zig.run",
+        "title": "Run Zig",
+        "category": "Zig",
+        "description": "Run the current Zig project / file"
+      },
+      {
+        "command": "zig.debug",
+        "title": "Debug Zig",
+        "category": "Zig",
+        "description": "Debug the current Zig project / file"
+      },
       {
         "command": "zig.build.workspace",
         "title": "Build Workspace",

src/extension.ts

@@ -2,6 +2,8 @@ import vscode from "vscode";
 
 import { activate as activateZls, deactivate as deactivateZls } from "./zls";
 import ZigCompilerProvider from "./zigCompilerProvider";
+import ZigMainCodeLensProvider from "./zigMainCodeLens";
+import ZigTestRunnerProvider from "./zigTestRunnerProvider";
 import { registerDocumentFormatting } from "./zigFormat";
 import { setupZig } from "./zigSetup";
 
@@ -12,6 +14,17 @@ export async function activate(context: vscode.ExtensionContext) {
 
         context.subscriptions.push(registerDocumentFormatting());
 
+        const testRunner = new ZigTestRunnerProvider();
+        testRunner.activate(context.subscriptions);
+
+        ZigMainCodeLensProvider.registerCommands(context);
+        context.subscriptions.push(
+            vscode.languages.registerCodeLensProvider(
+                { language: "zig", scheme: "file" },
+                new ZigMainCodeLensProvider(),
+            ),
+        );
+
         void activateZls(context);
     });
 }

src/zigMainCodeLens.ts

@@ -0,0 +1,107 @@
+import vscode from "vscode";
+
+import childProcess from "child_process";
+import fs from "fs";
+import path from "path";
+import util from "util";
+
+import { getWorkspaceFolder, getZigPath, isWorkspaceFile } from "./zigUtil";
+
+const execFile = util.promisify(childProcess.execFile);
+
+export default class ZigMainCodeLensProvider implements vscode.CodeLensProvider {
+    public provideCodeLenses(document: vscode.TextDocument): vscode.ProviderResult<vscode.CodeLens[]> {
+        const codeLenses: vscode.CodeLens[] = [];
+        const text = document.getText();
+
+        const mainRegex = /pub\s+fn\s+main\s*\(/g;
+        let match;
+        while ((match = mainRegex.exec(text))) {
+            const position = document.positionAt(match.index);
+            const range = new vscode.Range(position, position);
+            codeLenses.push(
+                new vscode.CodeLens(range, { title: "Run", command: "zig.run", arguments: [document.uri.fsPath] }),
+            );
+            codeLenses.push(
+                new vscode.CodeLens(range, { title: "Debug", command: "zig.debug", arguments: [document.uri.fsPath] }),
+            );
+        }
+        return codeLenses;
+    }
+
+    public static registerCommands(context: vscode.ExtensionContext) {
+        context.subscriptions.push(
+            vscode.commands.registerCommand("zig.run", zigRun),
+            vscode.commands.registerCommand("zig.debug", zigDebug),
+        );
+    }
+}
+
+function zigRun() {
+    if (!vscode.window.activeTextEditor) return;
+    const filePath = vscode.window.activeTextEditor.document.uri.fsPath;
+    const terminal = vscode.window.createTerminal("Run Zig Program");
+    terminal.show();
+    const wsFolder = getWorkspaceFolder(filePath);
+    if (wsFolder && isWorkspaceFile(filePath) && hasBuildFile(wsFolder.uri.fsPath)) {
+        terminal.sendText(`${getZigPath()} build run`);
+        return;
+    }
+    terminal.sendText(`${getZigPath()} run "${filePath}"`);
+}
+
+function hasBuildFile(workspaceFspath: string): boolean {
+    const buildZigPath = path.join(workspaceFspath, "build.zig");
+    return fs.existsSync(buildZigPath);
+}
+
+async function zigDebug() {
+    if (!vscode.window.activeTextEditor) return;
+    const filePath = vscode.window.activeTextEditor.document.uri.fsPath;
+    try {
+        const workspaceFolder = getWorkspaceFolder(filePath);
+        let binaryPath = "";
+        if (workspaceFolder && isWorkspaceFile(filePath) && hasBuildFile(workspaceFolder.uri.fsPath)) {
+            binaryPath = await buildDebugBinaryWithBuildFile(workspaceFolder.uri.fsPath);
+        } else {
+            binaryPath = await buildDebugBinary(filePath);
+        }
+
+        const debugConfig: vscode.DebugConfiguration = {
+            type: "lldb",
+            name: `Debug Zig`,
+            request: "launch",
+            program: binaryPath,
+            cwd: path.dirname(workspaceFolder?.uri.fsPath ?? path.dirname(filePath)),
+            stopAtEntry: false,
+        };
+        await vscode.debug.startDebugging(undefined, debugConfig);
+    } catch (e) {
+        void vscode.window.showErrorMessage(`Failed to build debug binary: ${(e as Error).message}`);
+    }
+}
+
+async function buildDebugBinaryWithBuildFile(workspacePath: string): Promise<string> {
+    // Workaround because zig build doesn't support specifying the output binary name
+    // `zig run` does support -femit-bin, but preferring `zig build` if possible
+    const outputDir = path.join(workspacePath, "zig-out", "tmp-debug-build");
+    const zigPath = getZigPath();
+    await execFile(zigPath, ["build", "--prefix", outputDir], { cwd: workspacePath });
+    const dirFiles = await vscode.workspace.fs.readDirectory(vscode.Uri.file(path.join(outputDir, "bin")));
+    const files = dirFiles.find(([, type]) => type === vscode.FileType.File);
+    if (!files) {
+        throw new Error("Unable to build debug binary");
+    }
+    return path.join(outputDir, "bin", files[0]);
+}
+
+async function buildDebugBinary(filePath: string): Promise<string> {
+    const zigPath = getZigPath();
+    const fileDirectory = path.dirname(filePath);
+    const binaryName = `debug-${path.basename(filePath, ".zig")}`;
+    const binaryPath = path.join(fileDirectory, "zig-out", "bin", binaryName);
+    void vscode.workspace.fs.createDirectory(vscode.Uri.file(path.dirname(binaryPath)));
+
+    await execFile(zigPath, ["run", filePath, `-femit-bin=${binaryPath}`], { cwd: fileDirectory });
+    return binaryPath;
+}

src/zigTestRunnerProvider.ts

@@ -0,0 +1,206 @@
+import vscode from "vscode";
+
+import childProcess from "child_process";
+import path from "path";
+import util from "util";
+
+import { DebouncedFunc, throttle } from "lodash-es";
+
+import { getWorkspaceFolder, getZigPath, isWorkspaceFile } from "./zigUtil";
+
+const execFile = util.promisify(childProcess.execFile);
+
+export default class ZigTestRunnerProvider {
+    private testController: vscode.TestController;
+    private updateTestItems: DebouncedFunc<(document: vscode.TextDocument) => void>;
+
+    constructor() {
+        this.updateTestItems = throttle(
+            (document: vscode.TextDocument) => {
+                this._updateTestItems(document);
+            },
+            500,
+            { trailing: true },
+        );
+
+        this.testController = vscode.tests.createTestController("zigTestController", "Zig Tests");
+        this.testController.createRunProfile("Run", vscode.TestRunProfileKind.Run, this.runTests.bind(this), true);
+        this.testController.createRunProfile(
+            "Debug",
+            vscode.TestRunProfileKind.Debug,
+            this.debugTests.bind(this),
+            false,
+        );
+        void this.findAndRegisterTests();
+    }
+
+    public activate(subscriptions: vscode.Disposable[]) {
+        subscriptions.push(
+            vscode.workspace.onDidOpenTextDocument((document) => {
+                this.updateTestItems(document);
+            }),
+            vscode.workspace.onDidCloseTextDocument((document) => {
+                !isWorkspaceFile(document.uri.fsPath) && this.deleteTestForAFile(document.uri);
+            }),
+            vscode.workspace.onDidChangeTextDocument((change) => {
+                this.updateTestItems(change.document);
+            }),
+            vscode.workspace.onDidDeleteFiles((event) => {
+                event.files.forEach((file) => {
+                    this.deleteTestForAFile(file);
+                });
+            }),
+            vscode.workspace.onDidRenameFiles((event) => {
+                event.files.forEach((file) => {
+                    this.deleteTestForAFile(file.oldUri);
+                });
+            }),
+        );
+    }
+
+    private deleteTestForAFile(uri: vscode.Uri) {
+        this.testController.items.forEach((item) => {
+            if (!item.uri) return;
+            if (item.uri.fsPath === uri.fsPath) {
+                this.testController.items.delete(item.id);
+            }
+        });
+    }
+
+    private async findAndRegisterTests() {
+        const files = await vscode.workspace.findFiles("**/*.zig");
+        for (const file of files) {
+            try {
+                const doc = await vscode.workspace.openTextDocument(file);
+                this._updateTestItems(doc);
+            } catch {}
+        }
+    }
+
+    private _updateTestItems(textDocument: vscode.TextDocument) {
+        if (textDocument.languageId !== "zig") return;
+
+        const regex = /\btest\s+(?:"([^"]+)"|([^\s{]+))\s*\{/g;
+        const matches = Array.from(textDocument.getText().matchAll(regex));
+        this.deleteTestForAFile(textDocument.uri);
+
+        for (const match of matches) {
+            const testDesc = match[1] || match[2];
+            const isDocTest = !!match[2];
+            const position = textDocument.positionAt(match.index);
+            const range = new vscode.Range(position, position.translate(0, match[0].length));
+            const fileName = path.basename(textDocument.uri.fsPath);
+
+            // Add doctest prefix to handle scenario where test name matches one with non doctest. E.g `test foo` and `test "foo"`
+            const testItem = this.testController.createTestItem(
+                `${fileName}.test.${isDocTest ? "doctest." : ""}${testDesc}`, // Test id needs to be unique, so adding file name prefix
+                `${fileName} - ${testDesc}`,
+                textDocument.uri,
+            );
+            testItem.range = range;
+            this.testController.items.add(testItem);
+        }
+    }
+
+    private async runTests(request: vscode.TestRunRequest, token: vscode.CancellationToken) {
+        const run = this.testController.createTestRun(request);
+        // request.include will have individual test when we run test from gutter icon
+        // if test is run from test explorer, request.include will be undefined and we run all tests that are active
+        for (const item of request.include ?? this.testController.items) {
+            if (token.isCancellationRequested) break;
+            const testItem = Array.isArray(item) ? item[1] : item;
+
+            run.started(testItem);
+            const start = new Date();
+            run.appendOutput(`[${start.toISOString()}] Running test: ${testItem.label}\r\n`);
+            const { output, success } = await this.runTest(testItem);
+            run.appendOutput(output.replaceAll("\n", "\r\n"));
+            run.appendOutput("\r\n");
+            const elapsed = new Date().getMilliseconds() - start.getMilliseconds();
+
+            if (!success) {
+                run.failed(testItem, new vscode.TestMessage(output), elapsed);
+            } else {
+                run.passed(testItem, elapsed);
+            }
+        }
+        run.end();
+    }
+
+    private async runTest(test: vscode.TestItem): Promise<{ output: string; success: boolean }> {
+        const zigPath = getZigPath();
+        if (test.uri === undefined) {
+            return { output: "Unable to determine file location", success: false };
+        }
+        const parts = test.id.split(".");
+        const lastPart = parts[parts.length - 1];
+        const args = ["test", "--test-filter", lastPart, test.uri.fsPath];
+        try {
+            const { stderr: output } = await execFile(zigPath, args);
+            return { output: output.replaceAll("\n", "\r\n"), success: true };
+        } catch (e) {
+            return { output: (e as Error).message.replaceAll("\n", "\r\n"), success: false };
+        }
+    }
+
+    private async debugTests(req: vscode.TestRunRequest, token: vscode.CancellationToken) {
+        const run = this.testController.createTestRun(req);
+        for (const item of req.include ?? this.testController.items) {
+            if (token.isCancellationRequested) break;
+            const test = Array.isArray(item) ? item[1] : item;
+            run.started(test);
+            try {
+                await this.debugTest(run, test);
+                run.passed(test);
+            } catch (e) {
+                run.failed(test, new vscode.TestMessage((e as Error).message));
+            }
+        }
+        run.end();
+    }
+
+    private async debugTest(run: vscode.TestRun, testItem: vscode.TestItem) {
+        if (testItem.uri === undefined) {
+            throw new Error("Unable to determine file location");
+        }
+        const testBinaryPath = await this.buildTestBinary(run, testItem.uri.fsPath, getTestDesc(testItem));
+        const debugConfig: vscode.DebugConfiguration = {
+            type: "lldb",
+            name: `Debug ${testItem.label}`,
+            request: "launch",
+            program: testBinaryPath,
+            cwd: path.dirname(testItem.uri.fsPath),
+            stopAtEntry: false,
+        };
+        await vscode.debug.startDebugging(undefined, debugConfig);
+    }
+
+    private async buildTestBinary(run: vscode.TestRun, testFilePath: string, testDesc: string): Promise<string> {
+        const wsFolder = getWorkspaceFolder(testFilePath)?.uri.fsPath ?? path.dirname(testFilePath);
+        const outputDir = path.join(wsFolder, "zig-out", "tmp-debug-build", "bin");
+        const binaryName = `test-${path.basename(testFilePath, ".zig")}`;
+        const binaryPath = path.join(outputDir, binaryName);
+        await vscode.workspace.fs.createDirectory(vscode.Uri.file(outputDir));
+
+        const zigPath = getZigPath();
+        const { stdout, stderr } = await execFile(zigPath, [
+            "test",
+            testFilePath,
+            "--test-filter",
+            testDesc,
+            "--test-no-exec",
+            `-femit-bin=${binaryPath}`,
+        ]);
+        if (stderr) {
+            run.appendOutput(stderr.replaceAll("\n", "\r\n"));
+            throw new Error(`Failed to build test binary: ${stderr}`);
+        }
+        run.appendOutput(stdout.replaceAll("\n", "\r\n"));
+        return binaryPath;
+    }
+}
+
+function getTestDesc(testItem: vscode.TestItem): string {
+    const parts = testItem.id.split(".");
+    return parts[parts.length - 1];
+}

src/zigUtil.ts

@@ -217,3 +217,17 @@ export async function downloadAndExtractArtifact(
         },
     );
 }
+
+export function getWorkspaceFolder(filePath: string): vscode.WorkspaceFolder | undefined {
+    const workspaceFolder = vscode.workspace.getWorkspaceFolder(vscode.Uri.file(filePath));
+    if (!workspaceFolder && vscode.workspace.workspaceFolders && vscode.workspace.workspaceFolders.length > 0) {
+        return vscode.workspace.workspaceFolders[0];
+    }
+    return workspaceFolder;
+}
+
+export function isWorkspaceFile(filePath: string): boolean {
+    const wsFolder = getWorkspaceFolder(filePath);
+    if (!wsFolder) return false;
+    return filePath.startsWith(wsFolder.uri.fsPath);
+}