rewrote initialization code for clarity and brevity (#105)

2 files changed, 145 insertions, 84 deletions

diff --git a/js/reveal.js b/js/reveal.js
index 1e942f2..3980416 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -1,5 +1,5 @@
 /*!
- * reveal.js 2.0 r17
+ * reveal.js 2.0 r18
  * http://lab.hakim.se/reveal-js
  * MIT licensed
  * 
@@ -40,7 +40,10 @@ var Reveal = (function(){
 			rollingLinks: true,
 
 			// Transition style
-			transition: 'default' // default/cube/page/concave/linear(2d)
+			transition: 'default', // default/cube/page/concave/linear(2d),
+
+			// Script dependencies to load
+			dependencies: []
 		},
 
 		// The horizontal and verical index of the currently active slide
@@ -71,9 +74,6 @@ var Reveal = (function(){
                         		'msTransform' in document.body.style ||
                         		'OTransform' in document.body.style ||
                         		'transform' in document.body.style,
-
-        // Detect support for elem.classList
-        supportsClassList = !!document.body.classList;
 		
 		// Throttles mouse wheel navigation
 		mouseWheelTimeout = 0,
@@ -96,12 +96,10 @@ var Reveal = (function(){
 	
 	
 	/**
-	 * Starts up the slideshow by applying configuration
-	 * options and binding various events.
+	 * Starts up the presentation if the client is capable.
 	 */
 	function initialize( options ) {
-		
-		if( ( !supports2DTransforms && !supports3DTransforms ) || !supportsClassList ) {
+		if( ( !supports2DTransforms && !supports3DTransforms ) ) {
 			document.body.setAttribute( 'class', 'no-transforms' );
 
 			// If the browser doesn't support core features we won't be 
@@ -109,11 +107,14 @@ var Reveal = (function(){
 			return;
 		}
 
+		// Copy options over to our config object
+		extend( config, options );
+
 		// Cache references to DOM elements
 		dom.wrapper = document.querySelector( '.reveal' );
 		dom.progress = document.querySelector( '.reveal .progress' );
 		dom.progressbar = document.querySelector( '.reveal .progress span' );
-		
+
 		if ( config.controls ) {
 			dom.controls = document.querySelector( '.reveal .controls' );
 			dom.controlsLeft = document.querySelector( '.reveal .controls .left' );
@@ -121,21 +122,9 @@ var Reveal = (function(){
 			dom.controlsUp = document.querySelector( '.reveal .controls .up' );
 			dom.controlsDown = document.querySelector( '.reveal .controls .down' );
 		}
-		
-		// Copy options over to our config object
-		extend( config, options );
-		
-		// Subscribe to input
-		addEventListeners();
-
-		// Updates the presentation to match the current configuration values
-		configure();
-
-		// Read the initial hash
-		readURL();
 
-		// Start auto-sliding if it's enabled
-		cueAutoSlide();
+		// Loads the dependencies and continues to #start() once done
+		load();
 
 		// Set up hiding of the browser address bar
 		if( navigator.userAgent.match( /(iphone|ipod|android)/i ) ) {
@@ -150,6 +139,76 @@ var Reveal = (function(){
 		
 	}
 
+	/**
+	 * Loads the dependencies of reveal.js. Dependencies are 
+	 * defined via the configuration option 'dependencies' 
+	 * and will be loaded prior to starting/binding reveal.js. 
+	 * Some dependencies may have an 'async' flag, if so they 
+	 * will load after reveal.js has been started up.
+	 */
+	function load() {
+		var scripts = [],
+			scriptsAsync = [];
+
+		for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
+			var s = config.dependencies[i];
+
+			// Load if there's no condition or the condition is truthy
+			if( !s.condition || s.condition() ) {
+				if( s.async ) {
+					scriptsAsync.push( s.src );
+				}
+				else {
+					scripts.push( s.src );
+				}
+
+				// Extension may contain callback functions
+				if( typeof s.callback === 'function' ) {
+					head.ready( s.src.match( /([\w\d_-]*)\.?[^\\\/]*$/i )[0], s.callback );
+				}
+			}
+		}
+
+		// Called once synchronous scritps finish loading
+		function proceed() {
+			// Load asynchronous scripts
+			head.js.apply( null, scriptsAsync );
+			
+			start();
+		}
+
+		if( scripts.length ) {
+			head.ready( proceed );
+
+			// Load synchronous scripts
+			head.js.apply( null, scripts );
+		}
+		else {
+			proceed();
+		}
+	}
+
+	/**
+	 * Starts up reveal.js by binding input events and navigating 
+	 * to the current URL deeplink if there is one.
+	 */
+	function start() {
+		// Subscribe to input
+		addEventListeners();
+
+		// Updates the presentation to match the current configuration values
+		configure();
+
+		// Read the initial hash
+		readURL();
+
+		// Start auto-sliding if it's enabled
+		cueAutoSlide();
+	}
+
+	/**
+	 * Applies the configuration settings from the config object.
+	 */
 	function configure() {
 		if( supports3DTransforms === false ) {
 			config.transition = 'linear';
diff --git a/js/reveal.min.js b/js/reveal.min.js
index 64cb86e..b7ed0fb 100644
--- a/js/reveal.min.js
+++ b/js/reveal.min.js
@@ -1,66 +1,68 @@
 /*!
- * reveal.js 2.0 r17
+ * reveal.js 2.0 r18
  * http://lab.hakim.se/reveal-js
  * MIT licensed
  * 
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
  */
-var Reveal=(function(){var j=".reveal .slides>section",a=".reveal .slides>section.present>section",e=!!("ontouchstart" in window),K={controls:true,progress:true,history:false,keyboard:true,loop:false,autoSlide:0,mouseWheel:true,rollingLinks:true,transition:"default"},k=0,c=0,v,C,W=[],d={},M="WebkitPerspective" in document.body.style||"MozPerspective" in document.body.style||"msPerspective" in document.body.style||"OPerspective" in document.body.style||"perspective" in document.body.style,l="WebkitTransform" in document.body.style||"MozTransform" in document.body.style||"msTransform" in document.body.style||"OTransform" in document.body.style||"transform" in document.body.style,y=!!document.body.classList;
-mouseWheelTimeout=0,autoSlideTimeout=0,writeURLTimeout=0,touch={startX:0,startY:0,startSpan:0,startCount:0,handled:false,threshold:40};function h(Y){if((!l&&!M)||!y){document.body.setAttribute("class","no-transforms");
-return;}d.wrapper=document.querySelector(".reveal");d.progress=document.querySelector(".reveal .progress");d.progressbar=document.querySelector(".reveal .progress span");
-if(K.controls){d.controls=document.querySelector(".reveal .controls");d.controlsLeft=document.querySelector(".reveal .controls .left");d.controlsRight=document.querySelector(".reveal .controls .right");
-d.controlsUp=document.querySelector(".reveal .controls .up");d.controlsDown=document.querySelector(".reveal .controls .down");}q(K,Y);A();F();E();H();if(navigator.userAgent.match(/(iphone|ipod|android)/i)){document.documentElement.style.overflow="scroll";
-document.body.style.height="120%";window.addEventListener("load",S,false);window.addEventListener("orientationchange",S,false);}}function F(){if(M===false){K.transition="linear";
-}if(K.controls&&d.controls){d.controls.style.display="block";}if(K.progress&&d.progress){d.progress.style.display="block";}if(K.transition!=="default"){d.wrapper.classList.add(K.transition);
-}if(K.mouseWheel){document.addEventListener("DOMMouseScroll",m,false);document.addEventListener("mousewheel",m,false);}if(K.rollingLinks){G();}}function A(){document.addEventListener("touchstart",w,false);
-document.addEventListener("touchmove",U,false);document.addEventListener("touchend",O,false);window.addEventListener("hashchange",t,false);if(K.keyboard){document.addEventListener("keydown",V,false);
-}if(K.controls&&d.controls){d.controlsLeft.addEventListener("click",n(x),false);d.controlsRight.addEventListener("click",n(i),false);d.controlsUp.addEventListener("click",n(r),false);
-d.controlsDown.addEventListener("click",n(B),false);}}function N(){document.removeEventListener("keydown",V,false);document.removeEventListener("touchstart",w,false);
-document.removeEventListener("touchmove",U,false);document.removeEventListener("touchend",O,false);window.removeEventListener("hashchange",t,false);if(K.controls&&d.controls){d.controlsLeft.removeEventListener("click",n(x),false);
-d.controlsRight.removeEventListener("click",n(i),false);d.controlsUp.removeEventListener("click",n(r),false);d.controlsDown.removeEventListener("click",n(B),false);
-}}function q(Z,Y){for(var aa in Y){Z[aa]=Y[aa];}}function L(aa,Y){var ab=aa.x-Y.x,Z=aa.y-Y.y;return Math.sqrt(ab*ab+Z*Z);}function n(Y){return function(Z){Z.preventDefault();
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-ab.innerHTML='<span data-title="'+ab.text+'">'+ab.innerHTML+"</span>";}}}}function D(){d.wrapper.classList.add("overview");var Y=Array.prototype.slice.call(document.querySelectorAll(j));
-for(var ad=0,ab=Y.length;ad<ab;ad++){var aa=Y[ad],ah="translateZ(-2500px) translate("+((ad-k)*105)+"%, 0%)";aa.setAttribute("data-index-h",ad);aa.style.display="block";
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-}var ag=Array.prototype.slice.call(aa.querySelectorAll("section"));for(var ac=0,Z=ag.length;ac<Z;ac++){var af=ag[ac],ae="translate(0%, "+((ac-c)*105)+"%)";
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-},getPreviousSlide:function(){return v;},getCurrentSlide:function(){return C;},getQueryHash:function(){var Y={};location.search.replace(/[A-Z0-9]+?=(\w*)/gi,function(Z){Y[Z.split("=").shift()]=Z.split("=").pop();
-});return Y;},addEventListener:function(Z,aa,Y){if("addEventListener" in window){(d.wrapper||document.querySelector(".reveal")).addEventListener(Z,aa,Y);
-}},removeEventListener:function(Z,aa,Y){if("addEventListener" in window){(d.wrapper||document.querySelector(".reveal")).removeEventListener(Z,aa,Y);}}};
-})();
\ No newline at end of file
+var Reveal=(function(){var k=".reveal .slides>section",b=".reveal .slides>section.present>section",e=!!("ontouchstart" in window),N={controls:true,progress:true,history:false,keyboard:true,loop:false,autoSlide:0,mouseWheel:true,rollingLinks:true,transition:"default",dependencies:[]},l=0,c=0,w,E,ac=[],d={},P="WebkitPerspective" in document.body.style||"MozPerspective" in document.body.style||"msPerspective" in document.body.style||"OPerspective" in document.body.style||"perspective" in document.body.style,m="WebkitTransform" in document.body.style||"MozTransform" in document.body.style||"msTransform" in document.body.style||"OTransform" in document.body.style||"transform" in document.body.style,x=0,j=0,B=0,W={startX:0,startY:0,startSpan:0,startCount:0,handled:false,threshold:40};
+function h(ad){if((!m&&!P)){document.body.setAttribute("class","no-transforms");return;}r(N,ad);d.wrapper=document.querySelector(".reveal");d.progress=document.querySelector(".reveal .progress");
+d.progressbar=document.querySelector(".reveal .progress span");if(N.controls){d.controls=document.querySelector(".reveal .controls");d.controlsLeft=document.querySelector(".reveal .controls .left");
+d.controlsRight=document.querySelector(".reveal .controls .right");d.controlsUp=document.querySelector(".reveal .controls .up");d.controlsDown=document.querySelector(".reveal .controls .down");
+}R();if(navigator.userAgent.match(/(iphone|ipod|android)/i)){document.documentElement.style.overflow="scroll";document.body.style.height="120%";window.addEventListener("load",X,false);
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+}if(N.controls&&d.controls){d.controlsLeft.addEventListener("click",o(z),false);d.controlsRight.addEventListener("click",o(i),false);d.controlsUp.addEventListener("click",o(s),false);
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+d.controlsRight.removeEventListener("click",o(i),false);d.controlsUp.removeEventListener("click",o(s),false);d.controlsDown.removeEventListener("click",o(D),false);
+}}function r(ae,ad){for(var af in ad){ae[af]=ad[af];}}function O(af,ad){var ag=af.x-ad.x,ae=af.y-ad.y;return Math.sqrt(ag*ag+ae*ae);}function o(ad){return function(ae){ae.preventDefault();
+ad.call();};}function X(){setTimeout(function(){window.scrollTo(0,1);},0);}function aa(ae){if(ae.target.contentEditable!="inherit"||ae.shiftKey||ae.altKey||ae.ctrlKey||ae.metaKey){return;
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+ad=true;break;case 75:case 38:s();ad=true;break;case 74:case 40:D();ad=true;break;case 36:L(0);ad=true;break;case 35:L(Number.MAX_VALUE);ad=true;break;
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+}}function Z(ai){if(!W.handled){var ag=ai.touches[0].clientX;var af=ai.touches[0].clientY;if(ai.touches.length===2&&W.startCount===2){var ah=O({x:ai.touches[1].clientX,y:ai.touches[1].clientY},{x:W.startX,y:W.startY});
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