waitize

Install

npm install --save waitize

Examples

A working example:

var waitize = require('waitize'),
    wait = waitize.wait,
    spawn = require('child_process').spawn;

var proc = spawn('ls', [], {stdio: 'inherit'});


var waiting = wait(proc, 'close', 'error');

waiting.then(function(){
    console.log('ok')
}).catch(function(err){
    console.log('not ok ' + err)
});

bla is not a shell command so the next example will fail:

var failing_proc = spawn('bla');

var waiting = wait(failing_proc, 'close', 'error');

waiting.then(function(){
    console.log('ok')
}).catch(function(err){
    console.log('not ok '+err)
});

A funkier example that actually works:

var waitize = require('waitize'),
    wait = waitize.wait,
    spawn = require('child_process').spawn;

var proc = spawn('npm', ['init'], {stdio: 'inherit'});


var waiting = wait(proc, 'close', 'error');

waiting.then(function(){
    console.log('ok. You now have a new npm module with a package.json file.')
}).catch(function(err){
    console.log('not ok' + err)
});

API

Objects passed to the first argument of waitize.wait should have one of these methods:

• one
• once
• on
• addEventListener

These methods are checked for in the order of the list.

waitize.wait(object, event|array, event)

Use one, or two events to start a promise on an event object.

The second event is optional.

The returned promise will resolve on the first event, and reject with the second event.

You can pass an array of events to the second argument instead.

Events passed to waitize.wait are used only once. When there's no one, or once method the listener is automatically removed.

waitize(object, event|array|object, event)

This is similar to waitize.wait, but instead sets a wait method to the input object.

waitize(myObject, 'done', 'error');
myObject.wait().then(function(){
    //called on done
}).catch(function()){
    //called on error
});

//On the prototype
waitize(MyClass.prototype, 'done', 'error');
var myObject = new MyClass();
myObject.wait().then(function(){
    //called on done
}).catch(function()){
    //called on error
});

You can also pass an object to waitize to control the method name.

waitize(myObject, {
    events: ['done', 'error'],
    method: 'createPromise'
});

myObject.createPromise().then(function(){
    //called on done
}).catch(function()){
    //called on error
});

About

There are a lot of situations where this will help. :)