Regex / grep generator

getSpecFiles.js

// getSpecFiles.js
const glob = require('glob');
const { readFileSync } = require('fs-extra');

function getFilteredSpecFiles(specs, opts = {}) {
  const { glob, grep } = getRegularExpression(opts);
  const fileNames = getGlobMatches(specs);

  const includedSpecFiles = [];

  for (const path of fileNames) {
    const file = readFileSync(path, 'utf-8');

    if (file.match(glob)) {
      includedSpecFiles.push(path);
    }
  }

  return includedSpecFiles;
}

function getGlobMatches(specs) {
  return specs.reduce((accumulator, spec) => {
    return [...accumulator, ...glob.sync(spec)];
  }, []);
}

function getRegularExpression({ happyFlow, target }) {
  if (!happyFlow && target === 'desktop') {
    // ❌ #happy-flow and ❌ #mobile
    return {
      glob: /^.*(describe|it)\((?!.*(#happy-flow|#mobile)).*/gm,
      grep: /^(?!.*(#happy-flow|#mobile)).*/,
    };
  } else if (happyFlow && target === 'desktop') {
    // ✅ #happy-flow, ❌ #mobile
    return {
      glob: /^.*(describe|it)\((?!.*(#mobile)).*(#happy-flow).*/gm,
      grep: /^(?!.*(#mobile)).*(#happy-flow).*/,
    };
  } else if (!happyFlow && target === 'mobile') {
    // ❌ #happy-flow, ❌ #desktop, ✅ #mobile
    return {
      glob: /^.*(describe|it)\((?!.*(#happy-flow|#desktop)).*(#mobile).*/gm,
      grep: /^(?!.*(#happy-flow|#desktop)).*(#mobile).*/
    };
  } else if (happyFlow && target === 'mobile') {
    // ✅ #happy-flow, ❌ #desktop, ✅ #mobile
    return {
      glob: /^.*(describe|it)\((?!.*(#desktop)).*(#happy-flow).*/gm,
      grep: /^(?!.*(#desktop)).*(#happy-flow).*/
    };
  } else {
    throw new Error('unforeseen case');
  }
}

exports.getFilteredSpecFiles = getFilteredSpecFiles;
exports.getRegularExpression = getRegularExpression;