std-pour

std-pour

Promise-based subprocess execution that writes output in real-time. Go ahead, pour yourself a command 🍺.

Usage

This library is great for chaining commands using promises, but seeing the output in real-time.

const { pour } = require('std-pour');
pour('ping', ['8.8.8.8', '-c', '4']).then(code => console.log(`Error Code: ${code}`));

This module wraps child_process.spawn so should be drop-in replacement (function signature-compatable) for any code that is using it.

const { spawn } = require('child_process');
const { pour } = require('std-pour');
const options = {
    cwd: '/usr',
    env: process.env
};
const ls1 = spawn('ls', ['-al'], options);
const ls2 = pour('ls', ['-al'], options);

API

pour/pourConsole

pour is an alias for pourConsole.

function pour (cmd, args, opts, stdout = process.stdout, stderr = process.stderr)

function pourConsole (cmd, args, opts, stdout = process.stdout, stderr = process.stderr)

The command, without any of the optional arguments supplied, will default to writing the cmd's stdout/stderr to process.stdout/process.stderr.

pourFile

function pourFile (cmd, args, opts, stdoutFile, stderrFile = stdoutFile)

pourFile is useful for writing command output to a file. stdoutFile should be a path to a file that will be created for you. Likewise, if you want stdout written to a seperate file, you can supply the path to a file which will be created for logging stdout.

Windows Users

If you're on Windows Node.js does some funny business when handling quotes that may result in you issuing a command that you know works from the console, but does not when run in Node. For example the following should work:

pour('ping', ['"8.8.8.8"'], {});

but fails with the following:

Ping request could not find host "8.8.8.8". Please check the name and try again.

There's a fantastically undocumented option windowsVerbatimArguments for handling quotes/similar that seems to do the trick, just be sure to add the following to your opts object:

const opts = {
    windowsVerbatimArguments: true
}

and your command should be back in business.

 pour('ping', ['"8.8.8.8"'], { windowsVerbatimArguments: true });

Honorable-Mentions

This library is inspired by (but in no way affiliated with or endorsed by) the great folks and food at The Standard Pour.