ci: scripts to review PRs locally (#24623)

PR Close #24623

scripts/github/utils/git_util.js

@@ -0,0 +1,95 @@
+/**
+ * @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
+ */
+
+const https = require('https');
+const shell = require('shelljs');
+
+function httpGet(server, path, headers) {
+  return new Promise((resolve, reject) => {
+    const options = {
+      hostname: server,
+      port: 443,
+      path: path,
+      method: 'GET',
+      headers: {'User-Agent': 'script', ...headers}
+    };
+    https
+        .get(
+            options,
+            (res) => {
+              let json = '';
+              res.on('data', (chunk) => json += chunk.toString());
+              res.on('end', () => resolve(json));
+            })
+        .on('error', (e) => reject(e));
+  });
+};
+
+let warnNoToken = true;
+
+async function githubGet(path) {
+  const token = process.env['TOKEN'];
+  const headers = {};
+  if (token) {
+    headers.Authorization = 'token ' + token;
+  } else if (warnNoToken) {
+    warnNoToken = false;
+    console.warn('############################################################');
+    console.warn('############################################################');
+    console.warn('WARNING: you should set the TOKEN variable to a github token');
+    console.warn('############################################################');
+    console.warn('############################################################');
+  }
+
+  return JSON.parse(await httpGet('api.github.com', '/repos/angular/angular/' + path, headers));
+};
+
+async function githubPrInfo(prNumber) {
+  const pr = (await githubGet('pulls/' + prNumber));
+  const label = pr.head.label.split(':');
+  const user = label[0];
+  const branch = label[1];
+  return {
+    commits: pr.commits,
+    repository: {
+      user: user,
+      gitUrl: `git@github.com:${user}/angular.git`,
+    },
+    branch: branch
+  };
+};  // trailing ; so that clang-format is not confused on async function
+
+function gitHasLocalModifications() {
+  return execNoFatal('git diff-index --quiet HEAD --').code != 0;
+}
+
+function execNoFatal(cmd, options) {
+  const fatal = shell.config.fatal;
+  try {
+    shell.config.fatal = false;
+    return shell.exec(cmd, options);
+  } finally {
+    shell.config.fatal = fatal;
+  }
+}
+
+function getCurrentBranch() {
+  return shell.exec('git branch', {silent: true})
+      .stdout.toString()
+      .split('\n')                      // Break into lines
+      .map((v) => v.trim())             // trim
+      .filter((b) => b[0] == '*')       // select current branch
+      .map((b) => b.split(' ')[1])[0];  // remove leading `*`
+}
+
+exports.httpGet = httpGet;
+exports.githubGet = githubGet;
+exports.githubPrInfo = githubPrInfo;
+exports.gitHasLocalModifications = gitHasLocalModifications;
+exports.execNoFatal = execNoFatal;
+exports.getCurrentBranch = getCurrentBranch;