feat(dev-infra): create a wizard for building commit messages (#38457)

Creates a wizard to walk through creating a commit message in the correct
template for commit messages in Angular repositories.

PR Close #38457

dev-infra/commit-message/wizard.ts

@@ -0,0 +1,43 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import {writeFileSync} from 'fs';
+
+import {info} from '../utils/console';
+
+import {buildCommitMessage} from './builder';
+
+/**
+ * The source triggering the git commit message creation.
+ * As described in: https://git-scm.com/docs/githooks#_prepare_commit_msg
+ */
+export type PrepareCommitMsgHookSource = 'message'|'template'|'merge'|'squash'|'commit';
+
+/** The default commit message used if the wizard does not procude a commit message. */
+const defaultCommitMessage = `<type>(<scope>): <summary>
+
+# <Describe the motivation behind this change - explain WHY you are making this change. Wrap all
+#  lines at 100 characters.>\n\n`;
+
+export async function runWizard(
+    args: {filePath: string, source?: PrepareCommitMsgHookSource, commitSha?: string}) {
+  // TODO(josephperrott): Add support for skipping wizard with local untracked config file
+
+  if (args.source !== undefined) {
+    info(`Skipping commit message wizard due because the commit was created via '${
+        args.source}' source`);
+    process.exitCode = 0;
+    return;
+  }
+
+  // Set the default commit message to be updated if the user cancels out of the wizard in progress
+  writeFileSync(args.filePath, defaultCommitMessage);
+
+  /** The generated commit message. */
+  const commitMessage = await buildCommitMessage();
+  writeFileSync(args.filePath, commitMessage);
+}