Add "releases" data file

.gitignore

@@ -3,15 +3,12 @@
 /.bundle
 bundle
 /.cache
-/data/version.yml
+/source/_data/versionCache.json
 .DS_Store
 .DS_Store?
 /Icon
 "Icon\r"
 .ruby-version
-/.dart-sass
-/.libsass
-/.language
 /.sass-cache
 *.scssc
 Thumbs.db

docker-compose.yml

@@ -10,3 +10,4 @@ services:
       - /app/node_modules
     ports:
       - '8080:8080'
+    tty: true

package.json

@@ -68,6 +68,7 @@
     "prettier": "^2.8.3",
     "rollup": "^3.12.0",
     "sass": "^1.57.1",
+    "semver-parser": "^4.0.1",
     "stylelint": "^14.16.1",
     "stylelint-config-prettier": "^9.0.4",
     "stylelint-config-standard-scss": "^6.1.0",

source/_data/releases.cjs

@@ -0,0 +1,90 @@
+const { spawn: nodeSpawn } = require('node:child_process');
+const fs = require('node:fs/promises');
+
+const VERSION_CACHE_PATH = './source/_data/versionCache.json';
+
+// Promise version of `spawn` to avoid blocking the main thread while waiting
+// for the child processes
+function spawn(cmd, args, options) {
+  return new Promise((resolve, reject) => {
+    const child = nodeSpawn(cmd, args, options);
+    const stderr = [];
+    const stdout = [];
+    child.stdout.on('data', (data) => {
+      stdout.push(data.toString());
+    });
+    child.on('error', (e) => {
+      stderr.push(e.toString());
+    });
+    child.on('close', () => {
+      if (stderr.length) reject(stderr.join(''));
+      else resolve(stdout.join(''));
+    });
+  });
+}
+
+// Retrieve the highest stable version of `repo`, based on its git tags
+// Store results in `VERSION_CACHE_PATH` for faster future runs
+async function getLatestVersion(repo) {
+  let versionCache;
+  try {
+    versionCache = JSON.parse(await fs.readFile(VERSION_CACHE_PATH));
+  } catch (err) {
+    if (err.code === 'ENOENT') {
+      versionCache = {}; // Cache is missing and needs to be created
+    } else {
+      throw err;
+    }
+  }
+  let latestVersion = versionCache[repo];
+  if (latestVersion !== undefined) return latestVersion;
+
+  console.log(`Fetching version information for ${repo}`);
+  const { parseSemVer, compareSemVer } = await import('semver-parser');
+  let stdout;
+  try {
+    stdout = await spawn(
+      'git',
+      ['ls-remote', '--tags', '--refs', `https://github.com/${repo}`],
+      { env: { ...process.env, GIT_TERMINAL_PROMPT: 0 } },
+    );
+  } catch (err) {
+    console.error(`Failed to fetch git tags for ${repo}`);
+    throw err;
+  }
+  const isNotPreRelease = (version) => {
+    const parsed = parseSemVer(version);
+    return parsed.matches && !parsed.pre;
+  };
+  latestVersion = stdout
+    .split('\n')
+    .map((line) => line.split('refs/tags/').slice(-1).at(0))
+    .filter(isNotPreRelease)
+    .sort(compareSemVer)
+    .slice(-1)
+    .at(0);
+
+  versionCache[repo] = latestVersion;
+  await fs.writeFile(VERSION_CACHE_PATH, JSON.stringify(versionCache));
+  return latestVersion;
+}
+
+function getReleaseUrl(repo, version = null) {
+  if (repo === 'ruby/sass') {
+    return 'https://github.com/sass/ruby-sass/blob/stable/doc-src/SASS_CHANGELOG.md';
+  }
+  return `https://github.com/${repo}/releases${
+    version ? `/tag/${version}` : ''
+  }`;
+}
+
+module.exports = async () => {
+  const data = {};
+  const repos = ['sass/libsass', 'sass/dart-sass', 'sass/migrator'];
+  for await (const repo of repos) {
+    const version = await getLatestVersion(repo);
+    const url = getReleaseUrl(repo, version);
+    data[repo.replace('sass/', '')] = { version, url };
+  }
+  return data;
+};

source/_layouts/base.liquid

@@ -73,8 +73,8 @@
         <div class="sl-l-container sl-c-list-horizontal-wrapper" aria-labelledby="release-nav">
           <ul class="sl-l-grid--justify-center">
             <li id="release-nav">Current Releases:</li>
-            <li><span class="release-name"><a href="/dart-sass">Dart Sass</a> <a href="https://github.com/sass/dart-sass/releases/tag/1.57.1">1.57.1</a></span></li>
+            <li><span class="release-name"><a href="/dart-sass">Dart Sass</a> <a href="{{ releases['dart-sass'].url }}">{{ releases['dart-sass'].version }}</a></span></li>
-            <li><span class="release-name"><a href="/libsass">LibSass</a> <a href="https://github.com/sass/libsass/releases/tag/3.6.5">3.6.5</a></span></li>
+            <li><span class="release-name"><a href="/libsass">LibSass</a> <a href="{{ releases['libsass'].url }}">{{ releases['libsass'].version }}</a></span></li>
             <li><span class="release-name"><a href="/ruby-sass">Ruby Sass</a> <span aria-label="coffin" role="presentation">⚰</span></span></li>
             <li class="sl-l-grid__column sl-l-large-grid__column--auto-size"><a href="/implementation">Implementation Guide</a></li>
           </ul>

yarn.lock

@@ -6176,6 +6176,7 @@ __metadata:
     prettier: ^2.8.3
     rollup: ^3.12.0
     sass: ^1.57.1
+    semver-parser: ^4.0.1
     stylelint: ^14.16.1
     stylelint-config-prettier: ^9.0.4
     stylelint-config-standard-scss: ^6.1.0
@@ -6215,6 +6216,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"semver-parser@npm:^4.0.1":
+  version: 4.0.1
+  resolution: "semver-parser@npm:4.0.1"
+  checksum: a737d33882124b64936e1ae3ea8f39c9c78077e8eecfcbee2958f3062debd6410be511a59cb089b93e62f7c1546ee2a252a38b8721f00ab80f916e25ff3eda7e
+  languageName: node
+  linkType: hard
+
 "semver@npm:2 || 3 || 4 || 5, semver@npm:^5.5.0":
   version: 5.7.1
   resolution: "semver@npm:5.7.1"