The snake_case to camelCase converter CLI app

SnakeToCamelCaseConverter.js

// Import the file system module
const fs = require('fs');

// Import the process module
const process = require('process');

// Define a function to convert snake_case to camelCase
function snakeToCamel(str) {
  // Split the string by underscore
  let words = str.split('_');
  // Capitalize the first letter of each word except the first one
  let camelWords = words.map((word, index) => {
    if (index === 0) {
      return word;
    } else {
      return word[0].toUpperCase() + word.slice(1);
    }
  });
  // Join the words by empty string
  return camelWords.join('');
}

// Define a function to check if a string is all capital letters
function isAllCaps(str) {
  // Compare the string with its uppercase version
  return str === str.toUpperCase();
}

// Define a function to process a JavaScript file
function processFile(fileName) {
  // Read the file content as a string
  fs.readFile(fileName, 'utf8', (err, data) => {
    if (err) {
      console.error(err);
      return;
    }
    // Split the string by whitespace and punctuation
    let tokens = data.split(/(\s+|[.,;(){}[\]])/);
    // Loop through the tokens and convert snake_case to camelCase if not all caps
    let newTokens = tokens.map((token) => {
      if (token.includes('_') && !isAllCaps(token)) {
        return snakeToCamel(token);
      } else {
        return token;
      }
    });
    // Join the tokens by empty string
    let newData = newTokens.join('');
    // Write the new data to a new file
    fs.writeFile(fileName + '.camel', newData, 'utf8', (err) => {
      if (err) {
        console.error(err);
        return;
      }
      console.log('File processed successfully!');
    });
  });
}

// Get the arguments array from the process object
let args = process.argv;
let argv = args.splice(2);

if (argv.length > 0) {
  if (['-h', '--help'].indexOf(argv[0]) >= 0) {
    console.log(`Usage:
  snake2camel [options] <filename>

Options:
  -h --help    show help
    `);
  } else {
    // Call the function with a file name as an argument
    processFile(argv[0]);
  }
}