Add support for Serenity LibJS (#33)

README.md

@@ -40,6 +40,7 @@ installing engines to make eshost automatically find the installed engines.
 | [engine262][]      | `engine262`                      | ✅           | ✅             | ✅           | ✅          | ✅           | ✅          |
 | [GraalJS][]        | `graaljs`                        | ✅           |                |              | ✅          |              | ✅          |
 | [Hermes][]         | `hermes`                         | ✅           |                |              |             |              | ✅          |
+| [LibJS][]          | `serenity-js`                    |              |                |              | ✅          |              |             |
 | [JavaScriptCore][] | `jsc`, `javascriptcore`          | ✅           | ✅             |              | ✅          |              | ✅          |
 | [QuickJS][]        | `quickjs`, `quickjs-run-test262` | ✅           |                | ✅           | ✅          | ✅           | ✅          |
 | [SpiderMonkey][]   | `sm`, `spidermonkey`             | ✅           | ✅             | ✅           | ✅          | ✅           | ✅          |
@@ -54,6 +55,7 @@ Some binaries may be exposed as batch/shell scripts to properly handling shared
 [engine262]: https://engine262.js.org
 [GraalJS]: https://github.com/graalvm/graaljs
 [Hermes]: https://hermesengine.dev
+[LibJS]: https://github.com/serenityos/serenity
 [JavaScriptCore]: https://developer.apple.com/documentation/javascriptcore
 [QuickJS]: https://bellard.org/quickjs/
 [SpiderMonkey]: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey

src/engines/libjs.js

@@ -0,0 +1,85 @@
+'use strict';
+
+const assert = require('assert');
+const execa = require('execa');
+const fetch = require('node-fetch');
+const path = require('path');
+const Installer = require('../installer');
+const { platform, unzip, untar } = require('../common');
+
+function checkPlatform() {
+  switch (platform) {
+    case 'linux-x64':
+      return;
+    default:
+      throw new Error(`LibJS does not have binary builds for ${platform}`);
+  }
+}
+
+class LibJSInstaller extends Installer {
+  constructor(...args) {
+    super(...args);
+
+    this.binPath = undefined;
+  }
+
+  static async resolveVersion(version) {
+    checkPlatform();
+    if (version !== 'latest') {
+      throw new Error('LibJS only provides binary builds for \'latest\'');
+    }
+
+    const artifactId = await fetch('https://api.github.com/repos/serenityos/serenity/actions/artifacts')
+      .then((x) => x.json())
+      .then((x) => x.artifacts.filter((a) => a.name === 'serenity-js'))
+      .then((x) => x[0].id)
+      .catch(() => {
+        throw new Error('Failed to find any releases for serenity-js on SerenityOS/serenity');
+      });
+    const runId = await fetch('https://api.github.com/repos/serenityos/serenity/actions/runs?event=push&branch=master&status=success')
+      .then((x) => x.json())
+      .then((x) => x.workflow_runs.filter((a) => a.name === 'Run test262 with LibJS and push results to the website repo'))
+      .then((x) => x.sort((a, b) => a.check_suite_id > b.check_suite_id))
+      .then((x) => x[0].check_suite_id)
+      .catch(() => {
+        throw new Error('Failed to find any recent serenity-js build run');
+      });
+    return `${runId}/${artifactId}`;
+  }
+
+  getDownloadURL(version) {
+    const ids = version.split('/');
+    return `https://nightly.link/serenityos/serenity/suites/${ids[0]}/artifacts/${ids[1]}`;
+  }
+
+  async extract() {
+    await unzip(this.downloadPath, `${this.extractedPath}zip`);
+    await untar(path.join(`${this.extractedPath}zip`, 'serenity-js.tar.gz'), this.extractedPath);
+  }
+
+  async install() {
+    await this.registerAssets('serenity-js/lib/*.so*');
+    const js = await this.registerAsset('serenity-js/bin/js');
+    this.binPath = await this.registerScript('serenity-js', `"${js}"`);
+  }
+
+  async test() {
+    const program = 'console.log("42")';
+    const output = '42';
+
+    assert.strictEqual(
+      (await execa(this.binPath, ['-c', program])).stdout,
+      output,
+    );
+  }
+}
+
+LibJSInstaller.config = {
+  name: 'LibJS',
+  id: 'libjs',
+  supported: [
+    'linux-x64',
+  ],
+};
+
+module.exports = LibJSInstaller;