1/**2 * Copyright (c) Meta Platforms, Inc. and affiliates.3 *4 * This source code is licensed under the MIT license found in the5 * LICENSE file in the root directory of this source tree.6 *7 * INSTALLATION:8 *   - `$ npm install octokit9 *   - Get a token from https://github.com/settings/tokens for use in the command below,10 *     set the token value as the GITHUB_AUTH_TOKEN environment variable11 *12 *  USAGE:13 *   - $ GITHUB_AUTH_TOKEN="..." git filter-branch -f --msg-filter "node update-commit-message.js" 2364096862b72cf4d801ef2008c54252335a2df9..HEAD14 */1516const {Octokit, App} = require('octokit');17const fs = require('fs');1819const OWNER = 'facebook';20const REPO = 'react-forget';21const octokit = new Octokit({auth: process.env.GITHUB_AUTH_TOKEN});2223const fetchPullRequest = async pullNumber => {24  const response = await octokit.request(25    'GET /repos/{owner}/{repo}/pulls/{pull_number}',26    {27      owner: OWNER,28      repo: REPO,29      pull_number: pullNumber,30      headers: {31        'X-GitHub-Api-Version': '2022-11-28',32      },33    }34  );35  return {body: response.data.body, title: response.data.title};36};3738function formatCommitMessage(str) {39  let formattedStr = '';40  let line = '';4142  const trim = str.replace(/(\r\n|\n|\r)/gm, ' ').trim();43  if (!trim) {44    return '';45  }4647  // Split the string into words48  const words = trim.split(' ');49  // Iterate over each word50  for (let i = 0; i < words.length; i++) {51    // If adding the next word doesn't exceed the line length limit, add it to the line52    if ((line + words[i]).length <= 80) {53      line += words[i] + ' ';54    } else {55      // Otherwise, add the line to the formatted string and start a new line56      formattedStr += line + '\n';57      line = words[i] + ' ';58    }59  }60  // Add the last line to the formatted string61  formattedStr += line;62  return formattedStr;63}6465function filterMsg(response) {66  const {body, title} = response;6768  const msgs = body.split('\n\n').flatMap(x => x.split('\r\n'));6970  const newMessage = [];7172  // Add title73  msgs.unshift(title);7475  for (const msg of msgs) {76    // remove "Stack from [ghstack] blurb"77    if (msg.startsWith('Stack from ')) {78      continue;79    }8081    // remove "* #1234"82    if (msg.startsWith('* #')) {83      continue;84    }8586    // remove "* __->__ #1234"87    if (msg.startsWith('* __')) {88      continue;89    }9091    const formattedStr = formatCommitMessage(msg);92    if (!formattedStr) {93      continue;94    }95    newMessage.push(formattedStr);96  }9798  const updatedMsg = newMessage.join('\n\n');99  return updatedMsg;100}101102function parsePullRequestNumber(text) {103  if (!text) {104    return null;105  }106  const ghstackUrlRegex =107    /https:\/\/github\.com\/[\w.-]+\/[\w.-]+\/pull\/(\d+)/;108  const ghstackMatch = text.match(ghstackUrlRegex);109  if (ghstackMatch) {110    return ghstackMatch[1];111  }112  const firstLine = text.split('\n').filter(text => text.trim().length > 0)[0];113  if (firstLine == null) {114    return null;115  }116  const prNumberRegex = /\(#(\d{3,})\)\s*$/;117  const prNumberMatch = firstLine.match(prNumberRegex);118  if (prNumberMatch) {119    return prNumberMatch[1];120  }121  return null;122}123124async function main() {125  const data = fs.readFileSync(0, 'utf-8');126  const pr = parsePullRequestNumber(data);127128  if (pr) {129    try {130      const response = await fetchPullRequest(pr);131      if (!response.body) {132        console.log(data);133        return;134      }135      const newMessage = filterMsg(response);136      console.log(newMessage);137      return;138    } catch (e) {139      console.log(data);140      return;141    }142  }143144  console.log(data);145}146147main();