Small node script to generate a markdown file with every character mentioned in a .fountain script file

characters.js

#!/usr/local/bin/node
/* eslint-env node, es6 */
const fs = require('fs');
const file = process.argv[2];
const path = require('path');
const lineReader = require('readline').createInterface({
  input: fs.createReadStream(file)
});
let characters = new Map();

function isUpperCase(str) {
  return str === str.toUpperCase();
}

function stripExtraTags(str) {
  let newStr = str.replace('(O.S.)', '');
  newStr = newStr.replace('^', '');
  newStr = newStr.replace('(PHONE)', '');
  newStr = newStr.replace('\*', '');
  return newStr.trim();
}

function isACharacter(str) {
  if (!str) return false;
  if (str.startsWith('INT.')) return false;
  if (str.startsWith('EXT.')) return false;
  if (str.startsWith('>')) return false;
  if (str.startsWith('=')) return false;
  if (str.indexOf('.') !== -1) return false;
  if (str.indexOf('!') !== -1) return false;
  if (str.indexOf('THEME') !== -1) return false;
  if (str.indexOf('CREDITS') !== -1) return false;
  return true;
}

lineReader.on('line', function readLine(line) {
  if (isUpperCase(line) && isACharacter(line)) {
    characters.set(stripExtraTags(line), stripExtraTags(line));
  }
});

lineReader.on('close', function close() {
  const fileDirectory = path.dirname(file);
  let contents = '# Characters\n\n';
  let i = 1;
  characters.forEach(item => {
    contents += i + '. ' + item + '\n';
    i++;
  });
  fs.writeFile(fileDirectory + '/Characters.md', contents, function writeFile(err) {
    if (err) {
      return console.error(err);
    }
  });
});