cl-diff-tool/src/index.js

command line diff tool

import fs from 'fs';
import path from 'path';
import yamlParser from 'js-yaml';
import iniParser from 'ini';
import { standart, plain, json } from './formats';
import buildAst from './buildAst';

const parsers = {
  json: JSON.parse,
  yaml: yamlParser.safeLoad,
  yml: yamlParser.safeLoad,
  ini: iniParser.parse,
};

const formatters = {
  standart,
  plain,
  json,
};
const isFilesExtEqual = (firstPath, secondPath) =>
  path.extname(firstPath) === path.extname(secondPath);

export default (firstPath, secondPath, format = 'standart') => {
  if (!isFilesExtEqual(firstPath, secondPath)) {
    throw new Error('File types should be equal');
  }

  const configType = path.extname(secondPath).split('.').join('');
  const beforeConfig = fs.readFileSync(firstPath, 'utf-8');
  const afterConfig = fs.readFileSync(secondPath, 'utf-8');

  const parseConfig = parsers[configType];
  const beforeObject = parseConfig(beforeConfig);
  const afterObject = parseConfig(afterConfig);
  const ast = buildAst(beforeObject, afterObject, format);
  return formatters[format](ast);
};