Patatap Sequence Bookmarklet.js

(function($, undefined)
{
    if (window.patatapSequenceIntervals)
    {
        // Clear
        $.each(window.patatapSequenceIntervals, function(index, interval)
        {
            clearInterval(interval);
        });
    }

    window.patatapSequenceIntervals = [];

    var $window = $(window);

    var startTime;
    var keySequence;
    var sequenceWait;

    var recordKeys = function(event)
    {
        if ( ! startTime)
        {
            startTime = Date.now();
        }

        keySequence.push(
        {
            keyCode: event.keyCode,
            wait: Date.now() - startTime
        });
    };

    var startRecordingKeys = function()
    {
        keySequence = [];
        $window.on('keydown', recordKeys);
    };

    var stopRecordingKeys = function()
    {
        $window.off('keydown', recordKeys);
        sequenceWait = Date.now() - startTime;
        startTime = false;
    };

    var pressKey = function(keyCode)
    {
        var event = $.Event('keydown',
        {
            which: keyCode
        });

        $window.trigger(event);
    };

    var initSequence = function()
    {
        var keySequenceClone = keySequence,
            intervalFunction = function()
            {
                $.each(keySequenceClone, function(index, value)
                {
                    setTimeout(function()
                    {
                        pressKey(value.keyCode);
                    }, value.wait);
                });
            };

        var interval = setInterval(function()
        {
            intervalFunction();
        }, sequenceWait);

        intervalFunction();

        window.patatapSequenceIntervals.push(interval);
    };

    $window
        .on('keydown', function(event)
        {
            if (event.keyCode == 13)
            {
                startRecordingKeys();
            }
        })
        .on('keyup', function(event)
        {
            if (event.keyCode == 13)
            {
                stopRecordingKeys();
                initSequence();
            }
        })
        .on('blur', function()
        {
            $.each(window.patatapSequenceIntervals, function(index, interval)
            {
                clearInterval(interval);
            });
        });

    var defaultHint = $('#hint'),
        delay = defaultHint.is(':visible') ? 1000 : 0,
        hint = $('<div id="hint">'),
        message = $('<div class="message">');

    $('body').append(hint);
    hint.append(message);
    message.text('Hold enter key to queue; Let go to repeat');

    if (delay)
    {
        defaultHint.fadeOut('slow');
    }

    hint.hide().delay(delay).fadeIn('slow', function()
    {
        setTimeout(function()
        {
            hint.fadeOut('slow');
        }, 4000);
    });

}(window.jQuery));