feat(dev-infra): standard CLI commands using yargs (#36326)

Creates a standard model for CLI commands provided by ng-dev.
Allows for us to have any of the tools/scripts extend to be
included in the ng-dev command, or be standalone using the same
yargs parser.

PR Close #36326

dev-infra/commit-message/BUILD.bazel

@@ -4,15 +4,19 @@ load("@npm_bazel_typescript//:index.bzl", "ts_library")
 ts_library(
     name = "commit-message",
     srcs = [
+        "cli.ts",
         "config.ts",
         "validate.ts",
+        "validate-file.ts",
     ],
     module_name = "@angular/dev-infra-private/commit-message",
     visibility = ["//dev-infra:__subpackages__"],
     deps = [
         "//dev-infra/utils:config",
         "@npm//@types/node",
+        "@npm//@types/yargs",
         "@npm//tslib",
+        "@npm//yargs",
     ],
 )
 

dev-infra/commit-message/cli.ts

@@ -0,0 +1,20 @@
+/**
+ * @license
+ * Copyright Google Inc. 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 * as yargs from 'yargs';
+import {validateFile} from './validate-file';
+
+/** Build the parser for the commit-message commands. */
+export function buildCommitMessageParser(localYargs: yargs.Argv) {
+  return localYargs.help().strict().command(
+      'pre-commit-validate', 'Validate the most recent commit message', {},
+      () => { validateFile('.git/COMMIT_EDITMSG'); });
+}
+
+if (require.main == module) {
+  buildCommitMessageParser(yargs).parse();
+}

dev-infra/commit-message/validate-file.ts

@@ -0,0 +1,21 @@
+/**
+ * @license
+ * Copyright Google Inc. 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 {readFileSync} from 'fs';
+import {join} from 'path';
+
+import {getRepoBaseDir} from '../utils/config';
+
+import {validateCommitMessage} from './validate';
+
+/** Validate commit message at the provided file path. */
+export function validateFile(filePath: string) {
+  const commitMessage = readFileSync(join(getRepoBaseDir(), filePath), 'utf8');
+  if (validateCommitMessage(commitMessage)) {
+    console.info('√  Valid commit message');
+  }
+}