cli.js

#!/usr/bin/env node

const fs = require('fs');
const path = require('path');
const walk = require('walk');
const yargs = require('yargs');
const getOwnersForFile = require('./get-owners-for-file');

const argv = yargs.command('$0 [options] <path>', false, _yargs => {
  _yargs
    .option('owner', {
      alias: 'o',
      describe: 'Find by owner',
      type: 'string',
      demand: true
    })
    .positional('path', {
      describe: 'The path to the source repo',
      type: 'string'
    })
    .example('$0 -o @org/team /path/to/repo');
}).argv;

const { path: sourcePath, owner } = argv;

if (!fs.existsSync(sourcePath)) {
  console.error(`Path does not exist: ${sourcePath}`);
  process.exit(1);
}

const codeowners = fs.readFileSync(path.join(sourcePath, 'CODEOWNERS'), 'utf8');

const walker = walk.walk(sourcePath, {
  followLinks: false,
  filters: ['.git']
});

walker.on('file', (root, fileStats, next) => {
  const relativeRoot = path.relative(sourcePath, root);
  const filePath = path.join(relativeRoot, fileStats.name);
  const owners = getOwnersForFile(codeowners, filePath);
  if (owners.indexOf(owner) !== -1) {
    console.log(filePath);
  }
  next();
});

get-owners-for-file.js

const ignore = require('ignore');

const isLineComment = /^\s*#/;

const getOwnersForFile = (codeownersText, filePath) => {
  const reversedCodeowners = (codeownersText || '')
    .split('\n')
    .filter(line => line.trim() && !isLineComment.test(line))
    .reverse();

  const ownersLine = reversedCodeowners.find(line => {
    const ignorePattern = line.split(' ')[0];
    return ignore()
      .add(ignorePattern)
      .ignores(filePath);
  });

  const owners = (ownersLine || '')
    .split(' ')
    .slice(1) // remove ignore pattern
    .map(owner => owner.trim())
    .filter(owner => owner);

  return owners;
};

module.exports = getOwnersForFile;

package.json

{
  "name": "find-configs",
  "version": "1.0.0",
  "description": "Find files by owner in a source repo",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Quantum Squad <quantumsquad@skyscanner.net>",
  "license": "ISC",
  "bin": {
    "find-configs": "./cli.js"
  },
  "dependencies": {
    "ignore": "^5.0.4",
    "walk": "^2.3.14",
    "yargs": "^12.0.5"
  },
  "devDependencies": {
    "@zeit/eslint-config-node": "^0.3.0",
    "eslint": "^5.10.0",
    "eslint-config-prettier": "^3.3.0",
    "eslint-plugin-prettier": "^3.0.0",
    "prettier": "^1.15.3"
  },
  "eslintConfig": {
    "plugins": [
      "prettier"
    ],
    "rules": {
      "prettier/prettier": [
        "error",
        {
          "singleQuote": true
        }
      ]
    },
    "extends": [
      "@zeit/eslint-config-node",
      "prettier"
    ]
  }
}