Buildstamp banner

banner.html

<div id="build-banner">
    <small>This buildstamp was generated on <time id="buildstamp-time">{{ buildstampTime }}</time></small>
    
    <section id="github-data">
    <h2>GitHub</h2>
    <dl id="latest-commit-data"> 
      <dt>Commit hash:</dt> 
      <dd><a href="https://github.com//{{ORG}}/{{REPO}}/commit/{{ commitHash }}"><data id="git-commit_hash">{{ commitHash }}</data></a></dd>
      
      <dt>Commit message:</dt> 
      <dd id="git-commit_message"><a href="https://github.com/{{ORG}}/{{REPO}}/commit/{{ commitHash }}">{{ commitMessage }}</a></dd>
      
      <dt>Commit time:</dt>
      <dd><time id="git-commit_time">{{ commitTime }}</time></dd>
      
      <dt>Commit author:</dt>
      <dd id="git-commit_author">{{ commitAuthor }}</dd>

      <dt>Status:</dt> 
      <dd id="git-branch_status">{{ commitStatus }}</dd>
    
      <dt>Tag:</dt> 
      <dd><data id="git-tag">{{ commitTag }}</data></dd>
    </dl>
  </section>

  <section id="circle-data">
      <h2>Circle</h2>

      <dl id="latest-build-data">
        <dt>Branch</dt> 
        <dd><data id="circle-branch">{{ circleBranch }}</data></dd>

        <dt>Build</dt> 
        <dd><a href="https://circleci.com/gh//{{ORG}}/{{REPO}}/{{circleBuildNumber}}"><data id="circle-build-number">{{ circleBuildNumber }}</data></a></dd>      

      </dl>
  </section>

</div>

buildstamp.js

const git = require('git-rev-sync');
const pkg = require('../package.json');
const moment = require('moment');
const tz = require('moment-timezone');
const timeFormat = 'MMMM Do YYYY, h:mm:ss a';
const timeStamp = moment().tz('America/New_York').format(timeFormat);
const childProcess = require('child_process');
const fs = require('fs');
const jsonTemplate = './src/assets/data/buildstamp.json';

const trackingBranch = 'origin/develop';
const workingBranch = process.env.CIRCLE_BRANCH || git.branch();

const gitRevList =
childProcess
  .execSync(`git rev-list origin/develop...HEAD --left-right --count`)
  .toString();

const aheadNumOfCommits = parseInt(gitRevList.slice(2, -1));
let aheadMessage;

const behindNumOfCommits = parseInt(gitRevList.slice(0, 1));
let behindMessage;

let relativeBranchStatus;

const getCommitsBehind = () => {
  switch (behindNumOfCommits) {
    case 0:
      break;
    case 1:
      behindMessage = '1 commit behind';
      break;
    default:
      behindMessage = `${behindNumOfCommits} commits behind`;
      break;
  }
  return behindMessage;
}

function getCommitsAhead() {
  switch (aheadNumOfCommits) {
    case 0:
      break;
    case 1:
      aheadMessage = '1 commit ahead';
      break;
    default:
      aheadMessage = `${aheadNumOfCommits} commits ahead`;
      break;
  }
  return aheadMessage;
}

function assembleStatusSentence() {
  if (behindNumOfCommits === 0 && aheadNumOfCommits === 0) {
    relativeBranchStatus = `The branch ${workingBranch} is up to date with ${trackingBranch}`;
    console.log(`up to date`);
  } else if (behindNumOfCommits === 0 && aheadNumOfCommits !== 0) {
    relativeBranchStatus = `The branch ${workingBranch} is ${getCommitsAhead()} of ${trackingBranch}`;
    console.log(`ahead`);
  } else if (behindNumOfCommits !== 0 && aheadNumOfCommits === 0) {
    relativeBranchStatus = `The branch ${workingBranch} is ${getCommitsBehind()} ${trackingBranch}`;
    console.log(`behind`);
  } else if (behindNumOfCommits !== 0 && aheadNumOfCommits !== 0) {
    relativeBranchStatus = `The branch ${workingBranch} is ${getCommitsBehind()} and ${getCommitsAhead()} of ${trackingBranch}`;
    console.log(`both off`);
  } else {
    relativeBranchStatus = 'No branch tracking information available';
    console.log(`wtf`);
  }

  return relativeBranchStatus;
}

const getCommitMessageTitle = function() {
  return childProcess
    .execSync(`git --no-pager show -s --format=%s ${git.long()}`)
    .toString()
    .trim();
};

const getCommitAuthor = function() {
  return childProcess
    .execSync(`git --no-pager show -s --format='%an'`)
    .toString()
    .trim();
};

const banner = `
[{
  "buildstampTime": "${timeStamp} (EST)",
  "hash": "${git.long()}",
  "message": "${getCommitMessageTitle()}",
  "time": "${moment(git.date()).tz('America/New_York').format(timeFormat)} (EST)",
  "author": "${getCommitAuthor()}",
  "branch": "${workingBranch}",
  "tag": "${git.tag()}",
  "status": "${assembleStatusSentence()}",
  "package": "${pkg.name}",
  "version": "${pkg.version}",
  "circleBranch": "${workingBranch}",
  "circleBuildNumber": "${process.env.CIRCLE_BUILD_NUM}",
  "circleBuildUrl": "${process.env.CIRCLE_BUILD_URL}"
}]
`;

const existingJSON = fs.readFileSync(jsonTemplate);
const fileWriter = fs.openSync(jsonTemplate, 'w+');
const buffer = new Buffer(banner);

childProcess.execSync('git update-index --skip-worktree ./src/assets/data/buildstamp.json');
fs.writeSync(fileWriter, buffer, 0, buffer.length, 0);
fs.close(fileWriter);

// tslint:disable-next-line: no-console
console.info(`File written to ${jsonTemplate}`);