# NODE SCRIPTING

notes on creating simple command-line tools with node.

## CREATING THE BASIC FRAMEWORK
* create a new repository on your github
* clone it to your dev folder
* now let's initiate the npm package
* npm init
* then add this to the package.json file:

        "bin": {
            "runitbro": "cli.js"
          },

* then create `cli.js` and add the node shebang at the top: `#!/usr/bin/env node`.
* then add some code to execute when you run the script, we can start with just `console.log("firing the script")`
* then we type `npm link` into terminal (making sure that we are in the root of the project folder)
* once we do that, we should be able to just enter `runitbro` in terminal (anywhere--not just in the project folder) and it should run.

## GETTING ARGUMENTS AND STYLING TEXT

* let's add some packages that are helpful in command-line scripting.
* first, let's add the ability to use different colors and sizes of text
* `npm i figlet`
* `npm i chalk`
* `npm i clear`
* or all with `npm i figlet chalk clear`
* now let's require those in and use them

var figlet = require('figlet');
var clear = require('clear');
var chalk = require('chalk');

clear();
console.log(figlet.textSync('title'));
console.log(chalk.magenta('colored text'))

* for getting arguments, we'll use `yargs`, so `npm i yargs` to install, then the basic idea is

var yargs = require('yargs').argv;
console.log(JSON.stringify(yargs, null, 4))

## RUNNING CHILD PROCESSES

[article on exec vs spawn](https://stackabuse.com/executing-shell-commands-with-node-js/)

## EXAMPLES OF COOL THINGS TO DO

## PUBLISHING ON NPM

1. let's get set up on NPM so that we can publish this thing later.

### youtube-dl concept

see if you can convert this to a node script!!

#! /usr/bin/env zsh

echo "rocking the party"
VIDEO_TITLE=$(youtube-dl -e --get-title  "$1")
echo "we are about to rock the party by downloading $VIDEO_TITLE"
youtube-dl -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best' -o "~/Desktop/_rtp/%(title)s-%(id)s.%(ext)s" "$1"
echo "all done downloading. we are now ready to rock the party"

### ffmpeg compressing

var transcodeFile = async function(file, proxyPath, options){
  await cp.spawnSync('ffmpeg', [
    '-i', file,
    '-c:v', 'libx264',
    '-pix_fmt', 'yuv420p',
    // '-vf', ('scale='+ outputWidth +':'+outputHeight ),
    '-preset', 'slow',
    '-crf', (options && options.crfVal) ? options.crfVal : '23',
    '-ac', '2',
    '-c:a', 'aac',
    '-b:a', '128k',
    proxyPath
  ], {
    stdio: [
      0, // Use parent's stdin for child
      'pipe', // Pipe child's stdout to parent
      2 // Direct child's stderr to a file
    ]
  });
}

### accessing data from APIs