Rank whatsapp group contacts sorting by messages count

whatsapp_group_flooders.js

/**
 * Requirements:
 * - NodeJS 12+
 *
 * Instructions:
 * - To get whatsapp group messages file, first go to the group in whatsapp, then select "export chat" option.
 * Retrieve the file from your phone and put it somewhere in your computer.
 */

const fs = require('fs');
const readline = require('readline');
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

const keysrt = (key) => (a, b) => (a[key] < b[key]) ? 1 : ((a[key] > b[key]) ? -1 : 0);
const escaper = (c) => c.split('').map(c => c.match(/\W/) ? `\\${c}` : c).join('');

(() => {
  rl.question('Whatsapp group messages backup file name, without extension: ', (filePath) => {
    const data = fs.readFile((filePath || '_chat.txt').trim(), 'utf8', (err, data) => {
      if (err || !data) {
        console.error('File not found');
        process.exit();
      }

      const contactsRegex = /\[.{18,20}\s(.*?):/g;
      const contacts = [...new Set([...data.matchAll(contactsRegex)].map((c) => c[1]))];
      const contactsMessages = contacts.map((contact) => ({
        contact,
        times: [...data.matchAll(RegExp('\\[.{18,20}\\s' + escaper(contact) + ':', 'g'))].length
      })).sort(keysrt('times'));

      console.log(contactsMessages.map((contactInfo) => `${contactInfo.contact}: ${contactInfo.times}`).join('\n'));

      process.exit();
    });
  });
})();