[POC] Creating a dynamic generator with dynamic options using node's yargs package

gen.json

{
  "requiredArgs": [
    "where",
    "command"
  ],
  "optionalArgs": [
    "mutation-name"
  ],
  "templates": [
    {
      "templatePath": "modules/core/public/generators/command/command.liquid",
      "destinationPath": "%(where)/%(command).liquid"
    },
    {
      "templatePath": "modules/core/public/generators/command/build.liquid",
      "destinationPath": "%(where)/%(command)/build.liquid"
    },
    {
      "templatePath": "modules/core/public/generators/command/check.liquid",
      "destinationPath": "%(where)/%(command)/check.liquid"
    }
  ]
}

generator.js

const fs = require('fs');
const { exit } = require('process');

const yargs = require('yargs/yargs')
const { hideBin } = require('yargs/helpers')

String.prototype.mapReplace = function(map) {
  var regex = [];
  for(var key in map)
      regex.push(key.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&"));
  return this.replace(new RegExp(regex.join('|'),"g"),function(word){
      return map[word];
  });
};

yargs(hideBin(process.argv))
  .command('generate <jsonPath>', 'Generate files based on the given json argument', (yargs) => {
    return yargs
      .positional('jsonPath', {
        describe: 'path of the generator file'
      })
  }, (argv) => {
    let generatorRawData = fs.readFileSync(argv.jsonPath);
    const generatorData = JSON.parse(generatorRawData);
    // magicStrings will contains %(varName): varValue pairs.
    let magicStrings = {};
    generatorData.requiredArgs.forEach(argumentName => {
      // Check that all required options are set.
      if (typeof argv[argumentName] === 'undefined') {
        console.error(`Missing required option. Please set --${argumentName} VALUE in the command line`);
        exit(1);
      }
      magicStrings[`%(${argumentName})`]= argv[argumentName];
    });
    generatorData.optionalArgs.forEach(argumentName => {
      magicStrings[`%(${argumentName})`]= argv[argumentName];
    });

    generatorData.templates.forEach(templateObj => {
      console.log(`here we can generate file form ${templateObj.templatePath} to ${templateObj.destinationPath.mapReplace(magicStrings)} using yeoman`)
    });
  })
  .parse()

output.txt

$ node generator.js generate gen.json --command delete --where modules/user/public/views/partials/lib/commands/user
here we can generate file form modules/core/public/generators/command/command.liquid to modules/user/public/views/partials/lib/commands/user/delete.liquid using yeoman
here we can generate file form modules/core/public/generators/command/build.liquid to modules/user/public/views/partials/lib/commands/user/delete/build.liquid using yeoman
here we can generate file form modules/core/public/generators/command/check.liquid to modules/user/public/views/partials/lib/commands/user/delete/check.liquid using yeoman