[POC] Creating a dynamic generator with dynamic options using node's commander 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 { Command } = require('commander');
const program = new Command();

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];
  });
};

program
  .name('generator')
  .description('CLI to generate files based on the given json argument')
  .version('0.0.0');

program.command('generate')
  .description('Generate files based on the given json argument')
  .argument('<jsonPath>', 'path of the generator file')
  .action((jsonPath) => {
    let generatorRawData = fs.readFileSync(jsonPath);
    const generatorData = JSON.parse(generatorRawData);
    // Here is the tricky part, we need to collect the additional arguments
    // and make key-value pairs from them.
    let additionalOptions = {};
    for (i=2; i<program.args.length; i++) {
      const argument = Object.fromEntries([program.args[i].split("=")]) 
      additionalOptions = {
        ...additionalOptions,
        ...argument
      };
    }
    // magicStrings will contains %(varName): varValue pairs.
    let magicStrings = {};
    generatorData.requiredArgs.forEach(argumentName => {
      // Check that all required options are set.
      if (typeof additionalOptions[argumentName] === 'undefined') {
        console.error(`Missing required argument. Please set <${argumentName}>=VALUE after --`);
        exit(1);
      }
      magicStrings[`%(${argumentName})`]= additionalOptions[argumentName];
    });
    generatorData.optionalArgs.forEach(argumentName => {
      magicStrings[`%(${argumentName})`]= additionalOptions[argumentName];
    });

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

program.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