app.js

#!/usr/bin/env node

const keypress = require('keypress');
const fs = require('fs');
const clc = require('cli-color');

// make `process.stdin` begin emitting "keypress" events
keypress(process.stdin);

// import code outputs
let codeBlock;
let codeBlockPlaceBefore = 0;
let codeBlockPlaceAfter = 2;

// if code choice is made, use that
if (process.argv.slice(2).length !== 0) {
  let fileName = process.argv.slice(2)[0];
  fileName = fileName.replace(/-/g, '');
  fs.readFile(`${__dirname}/code/${fileName}.txt`, (err, data) => {
    if (err) {
      throw err;
    }
    codeBlock = data.toString();
  });
} else {
  fs.readFile(`${__dirname}/code/code.txt`, (err, data) => {
    if (err) {
      throw err;
    }
    codeBlock = data.toString();
  });
}

// set out colors
let msg = clc.xterm(47).bgXterm(0);

process.stdout.write(msg('\u001B[2J\u001B[0;0f'));

// listen for inputs
process.stdin.on('keypress', (ch, key) => {
  if (key && key.ctrl && key.name === 'c') {
    msg = clc.xterm(0).bgXterm(231);
    process.stdout.write(msg('\u001B[2J\u001B[0;0f'));
    process.stdin.pause();
  }
  process.stdout.write(msg(codeBlock.substring(codeBlockPlaceBefore, codeBlockPlaceAfter)));
  codeBlockPlaceBefore += 2;
  codeBlockPlaceAfter += 2;
  if (codeBlock.substring(codeBlockPlaceBefore, codeBlockPlaceAfter).indexOf('};') !== -1) {
    codeBlockPlaceBefore = 0;
    codeBlockPlaceAfter = 2;
  }
});

process.stdin.setRawMode(true);
process.stdin.resume();