Convert handlebars to nunjucks

recursive-regex-replace.js

const fs = require('fs');
const path = require('path');

const walk = dir => {
  try {
    let results = [];
    const list = fs.readdirSync(dir);
    list.forEach(file => {
      file = path.join(dir, file);
      const stat = fs.statSync(file);
      if (stat && stat.isDirectory()) {
        // Recurse into subdir
        results = [...results, ...walk(file)];
      } else {
        // Is a file
        results.push(file);
      }
    });
    return results;
  } catch (error) {
    console.error(`Error when walking dir ${dir}`, error);
  }
};

const edit = filePath => {
  if (filePath.endsWith('hbs')) {
    var oldContent = fs.readFileSync(filePath, {encoding: 'utf8'});

    // REPLACE {{#if class}} with {% if class %}
    var regex = /\{\{#if\s+([a-zA-Z0-9-_\.]+)?\}\}/gi;
    var replaceVal = '{% if $1 %}';
    var newContent = oldContent.replace(regex, replaceVal);

    // REPLACE {{/if}} with {% endif %}
    oldContent = newContent;
    regex = /\{\{\/if\}\}/gi;
    replaceVal = '{% endif %}';
    newContent = oldContent.replace(regex, replaceVal);

    /* REPLACE 
    {{> social-list 
        dark="true" 
        centered="true"}} 
    with
    {% set dark="true" %}
    {% set centered="true" %}
    {% include social-list.njk %} */

    function replacer(match, p1, p2, offset, string) {
      var variablesArray = p2.split(/"\s+/gi);
      variablesArray = variablesArray.filter(n => n);
      var statements = variablesArray.map(function (statement) {
        return `{% set ${statement}" %}`;
      });
      statements = statements.join("\n") + "\n" + `{% include "${p1}.njk" %}`;
      return statements;
    }

    oldContent = newContent;
    regex = /\{\{>\s*([a-zA-Z0-9-_/]+)?\s*([a-zA-Z0-9-_/\.=:"'\s]+)\s*\}\}/gi;
    newContent = oldContent.replace(regex, replacer);

    fs.writeFileSync(filePath, newContent, {encoding: 'utf-8'});
    console.log(`Edited file: ${filePath}`);
  }
};

const main = () => {
  const dir = 'temp'; // folder name containing files
  const filePaths = walk(dir);
  filePaths.forEach(filePath => edit(filePath));
};

main();