Mooring

Born from a desire to have an API / hooks system that:

• Has a small API surfice
• Is easy to understand
• Has a data flow that is immutable
• Lets pre hooks manipulate the data going into a hooked method
• Lets post hooks manipulate the data coming out from a hooked method
• Not have the hooks stored on the prototype but rather in a seperate object

Credit to the kareem & grappling-hook projects for their insight and the inspiration they provided (also some code ;).)

API Spec

before hooks

Before hooks are called before a given function executes. They receve in their method sig all the params the hooked method receves and can augment them.

It runs before hooks with a synchronous API

    
        // Here, false marks the hook as synchronous
        hooks.before('cook', false, function(food) {
            // food == 'burger'
            assert.equal('burger', food);
 
            // your code here
            // synchronous hooks can NOT augment params passed to hooked methods
        });
 
        var cook = hooks.createHook('cook', function(food) {
            // This is the method you want to hook
            done();
        });
 
        // When you call the now-hooked method, the hooks will be called
        cook('burger');
    

It also runs before hooks with an asynchronous API

Asynchronous is the default

    
        hooks.before('cook', function(food, next) {
 
            assert.equal('burger', food);
            // food = burger
            food = 'hotdog';
            // your code here
 
            next(food);
        });
 
        var cook = hooks.createHook('cook', function(food) {
            // food = hotdog
            assert.equal('hotdog', food);
            done();
            // This is the method you want to hook
        });
 
        // When you call the now-hooked method, the hooks will be called
        cook('burger');
    

It can run multipe before hooks

    
        var count1 = 0;
        var count2 = 0;
 
        hooks.before('cook', function(next) {
            ++count1;
            next();
        });
 
        hooks.before('cook', function(next) {
            ++count2;
 
            next();
        });
        var cook = hooks.createHook('cook', function() {
            assert.equal(1, count1);
            assert.equal(1, count2);
            done();
        });
        cook();
    

after hooks

It runs after hooks with a synchronous API

    
        // Here, false marks the hook as synchronous
        hooks.after('cook', false, function(feelings) {
            // feelings == 'I LOVE BURGERS'
            assert.equal('I LOVE BURGERS', feelings);
            done();
        });
 
        var cook = hooks.createHook('cook', function(food) {
 
            return 'I LOVE BURGERS';
        });
 
        // When you call the now-hooked method, the hooks will be called
        cook('burger');
    

It also runs after hooks with an asynchronous API

Asynchronous is the default

    
        hooks.after('cook', function(feelings, feelings2, next) {
            // feelings == 'I LOVE BURGERS'
            // feelings2 == 'I hate fries'
            assert.equal('I LOVE BURGERS', feelings);
            assert.equal('I hate fries', feelings2);
 
            next('Burgers are OK');
        });
 
        var cook = hooks.createHook('cook', function(food, callback) {
            callback('I LOVE BURGERS', 'I hate fries');
        });
 
        // When you call the now-hooked method, the hooks will be called
        cook('burger', function(feelings, feelings2) {
            // feelings == 'Burgers are OK'
            // feelings2 == 'I hate fries'
            assert.equal('Burgers are OK', feelings);
            assert.equal('I hate fries', feelings2);
            done();
        });
    

It can run multipe after hooks

    
        var count1 = 0;
        var count2 = 0;
 
        hooks.after('cook', function(next) {
            ++count1;
            next();
        });
 
        hooks.after('cook', function(next) {
            ++count2;
 
            next();
        });
        var cook = hooks.createHook('cook', function(cb) {
            cb();
        });
        cook(function() {
            assert.equal(1, count1);
            assert.equal(1, count2);
            done();
 
        });
    

call hooks

It lets you call a hook without first defining it

    
        // Here, false marks the hook as synchronous
        hooks.after('cook', false, function(feelings) {
            // feelings == 'I LOVE BURGERS'
            assert.equal('I LOVE BURGERS', feelings);
            done();
        });
 
        // first param is the hook name, next is an array of arguments, next is a flag for is the call immutable and lastly is your hooked method/code
        hooks.callHook('cook', ['burger'], true, function(food) {
 
            return 'I LOVE BURGERS';
        });