mastodon-thread.mjs

#!/usr/bin/env node

import { watch } from 'node:fs/promises';
import * as fs from 'node:fs';
import * as path from 'node:path';

async function main() {
  const args = process.argv.slice(2);
  if (args.length === 0) {
    const bin = path.basename(process.argv[1]);
    console.log('Usage:');
    console.log(`${bin} thread.txt`);
    console.log();
    console.log('• The text file contains posts, separated by lines with “---”.');
    console.log('• This command displays the remaining characters for each post.');
    return;
  }
  const fileName = args[0];
  showThread(fileName);
  const watcher = watch(fileName);
  for await (const _event of watcher) {
    showThread(fileName);
  }
}

function showThread(fileName) {
  const text = fs.readFileSync(fileName, 'utf-8');
  console.clear();
  const chunks = text.split(/^---$/m)
    .map(ch => ch.trim());
  for (const chunk of chunks) {
    console.log(chunk);
    console.log('--- ' + (500 - countGraphemes(chunk)))
  }
}

function countGraphemes(text) {
  const segmenter = new Intl.Segmenter('en-US', { granularity: 'grapheme' });
  return Array.from(segmenter.segment(text)).length;
}

await main();