Figure out the exact version of microformats-parser installed

Author: Zegnat

index.js

@@ -6,6 +6,17 @@ const pkg = require("./package.json");
 const app = express();
 const port = process.env.PORT || 9000;
 
+function getDependencyVersion(dependencyName) {
+  const fs = require('fs');
+  const lockfile = require('@yarnpkg/lockfile');
+  const parsed = lockfile.parse(fs.readFileSync("./yarn.lock", "utf-8"));
+  if (parsed.type !== "success") return "unknown";
+  const dependency = parsed.object[`${dependencyName}@${pkg.dependencies[dependencyName]}`];
+  if (dependency === undefined) return "unknown";
+  return dependency.version;
+}
+const mf2version = getDependencyVersion("microformats-parser");
+
 function htmlToMf2(url, html, res) {
   const body = mf2(html, { baseUrl: url });
   res
@@ -29,7 +40,7 @@ app.get("/", async (req, res) => {
     htmlToMf2(url, text, res);
   } else {
     res.render("index.html.ejs", {
-      version: `${pkg.version} (lib: ${mf2.version})`,
+      version: `${pkg.version} (lib: ${mf2version})`,
     });
   }
 });

package.json

@@ -10,6 +10,7 @@
     "start": "node index.js"
   },
   "dependencies": {
+    "@yarnpkg/lockfile": "^1.1.0",
     "ejs": "^3.1.8",
     "express": "^4.18.1",
     "microformats-parser": "^1.4.1",

yarn.lock

@@ -2,6 +2,11 @@
 # yarn lockfile v1
 
 
+"@yarnpkg/lockfile@^1.1.0":
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/@yarnpkg/lockfile/-/lockfile-1.1.0.tgz#e77a97fbd345b76d83245edcd17d393b1b41fb31"
+  integrity sha512-GpSwvyXOcOOlV70vbnzjj4fW5xW/FdUF6nQEt1ENy7m4ZCczi1+/buVUPAqmGfqznsORNFzUMjctTIp8a9tuCQ==
+
 accepts@~1.3.8:
   version "1.3.8"
   resolved "https://registry.yarnpkg.com/accepts/-/accepts-1.3.8.tgz#0bf0be125b67014adcb0b0921e62db7bffe16b2e"