p5.sound --> p5.js documentation watch script

docwatch.js

/*
Documentation Watcher

This assumes a directory structure like...
./docwatch.js
./p5.js/ <repo>
./p5.js-sound/ <repo>

Usage:
- Run `node docwatch.js` in the root directory.
*/
 
const fs = require('fs');
const path = require('path');
const { spawn } = require('child_process');

// repo locations
const p5 = path.join(__dirname, './p5.js');
const p5Sound = path.join(__dirname, './p5.js-sound');

watchP5Sound();
watchDocs();

// watch p5.sound for changes...
fs.watchFile(`${p5Sound}/lib/p5.sound.js`, function() {
  // once the compiled p5.js-sound has been moved to p5.js `addons`, generate documentation
  copyFile(`${p5Sound}/lib/p5.sound.js`, `${p5}/lib/addons/p5.sound.js`)
    .then(copyFile(`${p5Sound}/lib/p5.sound.js`, `${p5}/docs/reference/assets/js/p5.sound.js`))
    .then(generateDocs)
    .then(function() {
      console.log('copied p5.sound and generated docs!');
    })
    .catch(function(err) {
      console.error(err);
    });
});

fs.watchFile(`${p5Sound}/lib/p5.sound.min.js`, function() {
  copyFile(`${p5Sound}/lib/p5.sound.min.js`, `${p5}/lib/addons/p5.sound.min.js`)
  .then(copyFile(`${p5Sound}/lib/p5.sound.min.js`, `${p5}/docs/reference/assets/js/p5.sound.min.js`))
  .then(function() {
    console.log('copied p5.min!');
  })
  .catch(function(err) {
    console.error(err);
  })
});

function generateDocs() {
  return new Promise(function(resolve, reject) {
    console.log('running grunt yui:docs');

    const gruntTask = spawn('grunt', ['yui:docs'], {
      cwd: p5
    });
    gruntTask.stdout.on('data', function(data) {
      console.log(`Generate Docs: ${data}`)
    });
    gruntTask.stderr.on('data', function(err) {
      console.error(`Generate Docs: ${err}`);
    });
    gruntTask.stdout.on('finish', function(code, signal) {
      if (!signal) {
        return resolve(code);
      } else {
        console.error('child process exited with ' +
          `code ${code} and signal ${signal}`);
        return reject(code);
      }
    });
  });
}

function copyFile(oldLocation, newLocation) {
  const read = fs.createReadStream(oldLocation);
  const write = fs.createWriteStream(newLocation);
 
  return new Promise( function(resolve, reject) {
    read.on('error', reject);
    write.on('error', reject);
    write.on('finish', resolve);
    read.pipe(write);
  }).catch(function(err) {
    read.destroy();
    write.end();
    throw err;
  });
}

function watchP5Sound() {
  console.log('p5Sound: watching src for changes');

  const gruntTask = spawn('grunt', ['dev'], {
    cwd: p5Sound
  });
  gruntTask.stdout.on('data', function(data) {
    console.log(`p5Sound: ${data}`)
  });
  gruntTask.stderr.on('data', function(err) {
    console.error(`p5Sound: ${err}`);
  });
}

function watchDocs() {
  const gruntTask = spawn('grunt', ['yui:dev'], {
    cwd: p5
  });
  gruntTask.stdout.on('data', function(data) {
    console.log(`p5 yui:dev: ${data}`)
  });
  gruntTask.stderr.on('data', function(err) {
    console.error(`p5 yui:dev: ${err}`);
  });
}

console.log('watching files for changes');