diff-package-json.js

/**
 * Simple script that compares our npm manifest against Oscar's manifest
 * and list all results that don't match versions.
 *
 * Usage:
 *
 * node tools/diff-package-json.js path/to/oscar/package.json
 **/

const current = require('../package');
const target = require(process.argv[2]);

function getDependencies(source) {
  return Object.assign(source.dependencies, source.devDependencies);
}

function diff(mine, theirs) {
  const myKeys = Object.keys(mine);
  const theirKeys = Object.keys(theirs);
  const changes = theirKeys
    .filter(dependency => {
      return myKeys.includes(dependency);
    })
    .filter(dependency => {
      const myVersion = mine[dependency];
      const theirVersion = theirs[dependency];

      return myVersion !== theirVersion;
    });

  const size = changes.reduce((previous, next) => {
    return next.length > previous.length ? next : previous;
  }, 'Dependency').length;

  const format = (content, size) => {
    const difference = (size - content.length) + 1;
    const pad = new Array(difference).join(' ');

    return `${content}${pad}`;
  };

  console.log(`${format('Dependency', size)} | Mine\t| Theirs`);

  changes.forEach(change => {
    const myVersion = mine[change];
    const theirVersion = theirs[change];

    console.log(`${format(change, size)} | ${myVersion}\t| ${theirVersion}`);
  });
}

const mine = getDependencies(current);
const theirs = getDependencies(target);

console.log(diff(mine, theirs));