Start adding homebrew generation

Author: durran

package-lock.json

@@ -62,6 +62,7 @@
     "@typescript-eslint/parser": "^2.16.0",
     "adm-zip": "^0.4.14",
     "aws-sdk": "^2.674.0",
+    "axios": "^0.19.2",
     "browserify": "^16.5.0",
     "bson": "^4.0.4",
     "chai": "^4.2.0",

package.json

@@ -0,0 +1,78 @@
+import crypto from 'crypto';
+import axios from 'axios';
+import handlebars from 'handlebars';
+
+/**
+ * The main package url.
+ */
+const URL = 'https://registry.npmjs.org/@mongosh/cli-repl';
+
+/**
+ * The homebrew formula template.
+ */
+const TEMPLATE = `
+require "language/node"
+
+class Mongosh < Formula
+  desc "The MongoDB Shell"
+  homepage "https://github.com/mongodb-js/mongosh#readme"
+  url "{{tarball}}"
+  version "{{version}}"
+  sha256 "{{sha}}"
+
+  depends_on "node"
+
+  def install
+    system "npm", "install", *Language::Node.std_npm_install_args(libexec)
+    bin.install_symlink Dir["#{libexec}/bin/*"]
+  end
+
+  test do
+    system "#{bin}/mongosh --version"
+  end
+end`;
+
+const getNpmMetadata = async() => {
+  const { data } = await axios.get(URL);
+  return data;
+};
+
+const getSha256 = async(sha: string, tarball: string) => {
+  return new Promise(async(resolve, reject) => {
+    if (sha.length === 64) {
+      resolve(sha);
+    } else {
+      const hash = crypto.createHash('sha256');
+      const { data } = await axios.get(tarball);
+      console.log(data);
+
+      data.on('readable', () => {
+        const input = data.read();
+        if (input) {
+          hash.update(input);
+        }
+      });
+
+      data.on('end', () => {
+        resolve(hash.digest('hex'));
+      });
+
+      data.on('error', reject);
+    }
+  });
+};
+
+const generateFormula = async() => {
+  const data = await getNpmMetadata();
+  const template = handlebars.compile(TEMPLATE);
+  const version = data['dist-tags'].latest;
+  const tarball = data.versions[version].dist.tarball;
+  const sha = data.versions[version].dist.shasum;
+  const rendered = template({
+    tarball: tarball,
+    version: version,
+    sha: await getSha256(sha, tarball)
+  });
+  console.log('mongosh: created homebrew template:', rendered);
+  return rendered;
+};

packages/build/src/homebrew.ts

@@ -13,6 +13,7 @@ try {
     const driverOptions = mapCliToDriver(options);
     const driverUri = generateUri(options);
     const appname = `${process.title} ${version}`;
+    /* eslint no-new:0 */
     new CliRepl(driverUri, { appname, ...driverOptions }, options);
   }
 } catch (e) {