if(window.jQuery){(function($){
    var scrollTo = function(pos, speed) {
        var speed = speed || 400, pos = pos || 0;
        $("html, body").animate({'scrollTop': pos}, speed);
        return false;
    }
    var bindVimKey = function(step, speed) {
        var keyMap = {27:"esc", 71:"g", 73:"i", 74:"j", 75:"k"};
        var step = step || 40, speed = speed || 50;
        var h = $(document).height();
        var b = $('body');
        $(this).keydown(function(e){
            var tagName = e.target.tagName.toLowerCase();
            if("input" == tagName || "textarea" == tagName){
                if("esc" == keyMap[e.keyCode]){
                    $(e.target).blur(); // leave text area
                    return true;
                }
                return true;
            }
            var t = $(document).scrollTop();
            if(!e.shiftKey && "g" == keyMap[e.keyCode]){
                // "gg" behavior
                var pressG = b.data('pressG') || 0;
                if(pressG){
                    // this means that you have pressed "g" before
                    b.removeData('pressG');
                    if(0==t){return false;} // already at top
                    scrollTo(0, speed);
                    return false;
                }else{
                    b.data('pressG', 1);
                    // another "g" pressing must be in one second
                    setTimeout("(function(){$('body').removeData('pressG')})()", 1000);
                    return false;
                }
            } else if(!e.shiftKey){
                b.removeData('pressG');
                if("j" == keyMap[e.keyCode]){
                    if(t > h-5){return false;}
                    scrollTo("+="+step, speed);
                    return false;
                }else if("k" == keyMap[e.keyCode]){
                    if(t<2){return false;}
                    scrollTo("-="+step, speed);
                    return false;
                }else if("i" == keyMap[e.keyCode]){
                    $('input:text,textarea').eq(0).focus();
                    return false;
                }
            }else if("g" == keyMap[e.keyCode]){
                // shift + g
                b.removeData('pressG');
                if(h==t){return false;}
                scrollTo(h, speed);
                return false;
            }
        });
    }
    $.extend($.fn, {
        scrollTo: scrollTo,
        bindVimKey: bindVimKey
    });
})(jQuery);}

if(window.jQuery){(function($){
    $(function(){
        $(window).bindVimKey();
    });
})(jQuery);}