open mdx presentation from list

index.js

// by default it will look for `.mdx` files into the `./presentations` folder
const testFolder = './presentations';

const fs = require('fs');
const path = require('path');
const prompts = require('prompts');
const cmd = require('node-cmd');

if (!fs.existsSync(testFolder)) {
  // testFolder does not exist
  console.log('no "presentations" file found.');
} else {
  fs.readdir(testFolder, async (err, files) => {

    // filter files in testFolder that its extension is `.mdx`
    const selectedFiles = files.reduce((acc, file) => {
      const extension = path.extname(file);
      const filename = file.split(extension)[0];
      if (extension === '.mdx') {
        acc.push({ title: filename, value: file });
      }

      return acc;
    }, []);
    
    // prompt a list of all presentations so you can select one of them.
    const response = await prompts({
      type: 'select',
      name: 'name',
      message: 'What presentation you want to load?',
      choices: selectedFiles
    });

    // run `mdx-deck` command.
    cmd.run(`mdx-deck ./presentations/${response.name}`);
    console.log(`Loading ${response.name} presentation....`);
  });
}

/*
TODO:
- accepts options (folder...)
- use case when you want only to select from firs-child directory files. maybe you import another .mdx file from the source...
- pack this as an npm package so you can call this as another package and also to manage versions.
- what else?? let me know!
*/