From 49e8e0d205dad7ad60d3eb060787a67b197ba1d1 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Sat, 11 Aug 2012 20:25:55 -0400
Subject: [PATCH] rewrote initialization code for clarity and brevity (#105)

---
 index.html       |  80 +++++++++----------------------
 js/reveal.js     | 107 +++++++++++++++++++++++++++++++----------
 js/reveal.min.js | 122 ++++++++++++++++++++++++-----------------------
 3 files changed, 168 insertions(+), 141 deletions(-)
diff --git a/index.html b/index.html
index 079bc73..e1c81e2 100644
--- a/index.html
+++ b/index.html
@@ -4,7 +4,7 @@
 	<head>
 		<meta charset="utf-8">
 		
-		<title>reveal.js - HTML5 Presentations</title>
+		<title>reveal.js - The HTML Presentation Framework</title>
 
 		<meta name="description" content="A framework for easily creating beautiful presentations using HTML">
 		<meta name="author" content="Hakim El Hattab">
@@ -21,9 +21,8 @@
 		<link rel="stylesheet" href="lib/css/zenburn.css">
 
 		<script>
-			// If the query includes print-pdf we'll use the PDF print sheet
-			var printStyle = window.location.search.match( /print-pdf/gi ) ? 'pdf' : 'paper';
-			document.write( '<link rel="stylesheet" href="css/print/' + printStyle + '.css" type="text/css" media="print">' );
+			// If the query includes 'print-pdf' we'll use the PDF print sheet
+			document.write( '<link rel="stylesheet" href="css/print/' + ( window.location.search.match( /print-pdf/gi ) ? 'pdf' : 'paper' ) + '.css" type="text/css" media="print">' );
 		</script>
 
 		<!--[if lt IE 9]>
@@ -283,62 +282,29 @@ function linkify( selector ) {
 		</div>
 
 		<script src="lib/js/head.min.js"></script>
+		<script src="js/reveal.min.js"></script>
 
 		<script>
-			head.ready( function() {
+			
+			// Full list of configuration options available here:
+			// https://github.com/hakimel/reveal.js#configuration
+			Reveal.initialize({
+				controls: true,
+				progress: true,
+				history: true,
+				
+				transition: Reveal.getQueryHash().transition || 'default', // default/cube/page/concave/linear(2d)
 
-				// Fires when a slide with data-state=customevent is activated
-				Reveal.addEventListener( 'customevent', function() {
-					console.log( '"customevent" has fired' );
-				} );
-
-				// Fires each time a new slide is activated
-				Reveal.addEventListener( 'slidechanged', function( event ) {
-					// event.previousSlide, event.currentSlide, event.indexh, event.indexv
-				} );
-
-				// Full list of configuration options available here:
-				// https://github.com/hakimel/reveal.js#configuration
-				Reveal.initialize({
-					controls: true,
-					progress: true,
-					history: true,
-					
-					transition: Reveal.getQueryHash().transition || 'default' // default/cube/page/concave/linear(2d)
-				});
-
-				// Load highlight.js for syntax highlighting of code samples
-				head.js( 'lib/js/highlight.js', function() { 
-					hljs.initHighlightingOnLoad(); 
-				} );
-
-			} );
-
-			// Scripts that should be loaded before initializing
-			var scripts = [];
-
-			// If the browser doesn't support classList, load a polyfill
-			if( !document.body.classList ) {
-				head.js( 'lib/js/classList.js' );
-			}
-
-			// Load markdown parser if there are slides defined using markdown
-			if( document.querySelector( '[data-markdown]' ) ) {
-				scripts.push( 'lib/js/showdown.js' );
-				scripts.push( 'lib/js/data-markdown.js' );
-			}
-
-			scripts.push( 'js/reveal.min.js' );
-
-			// If we're runnning the notes server we need to include some additional JS
-			// TODO Is there a better way to determine if we're running the notes server?
-			if( window.location.host === 'localhost:1947' ) {
-				scripts.push( 'socket.io/socket.io.js' );
-				scripts.push( 'plugin/speakernotes/client.js' );
-			}
-
-			// Load the scripts and, when completed, initialize reveal.js
-			head.js.apply( null, scripts );
+				// Optional libraries used to extend on reveal.js
+				dependencies: [
+					{ src: 'lib/js/highlight.js', async: true, callback: function() { window.hljs.initHighlightingOnLoad(); } },
+					{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
+					{ src: 'lib/js/showdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
+					{ src: 'lib/js/data-markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
+					{ src: 'socket.io/socket.io.js', async: true, condition: function() { return window.location.host === 'localhost:1947'; } },
+					{ src: 'plugin/speakernotes/client.js', async: true, condition: function() { return window.location.host === 'localhost:1947'; } },
+				]
+			});
 			
 		</script>
 
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();
-Y.call();};}function S(){setTimeout(function(){window.scrollTo(0,1);},0);}function V(Z){if(Z.target.contentEditable!="inherit"||Z.shiftKey||Z.altKey||Z.ctrlKey||Z.metaKey){return;
-}var Y=false;switch(Z.keyCode){case 80:case 33:Q();Y=true;break;case 78:case 34:u();Y=true;break;case 72:case 37:x();Y=true;break;case 76:case 39:i();Y=true;
-break;case 75:case 38:r();Y=true;break;case 74:case 40:B();Y=true;break;case 36:I(0);Y=true;break;case 35:I(Number.MAX_VALUE);Y=true;break;case 32:R()?T():u();
-Y=true;break;case 13:if(R()){T();Y=true;}break;}if(Y){Z.preventDefault();}else{if(Z.keyCode===27&&M){P();Z.preventDefault();}}H();}function w(Y){touch.startX=Y.touches[0].clientX;
-touch.startY=Y.touches[0].clientY;touch.startCount=Y.touches.length;if(Y.touches.length===2){touch.startSpan=L({x:Y.touches[1].clientX,y:Y.touches[1].clientY},{x:touch.startX,y:touch.startY});
-}}function U(ad){if(!touch.handled){var ab=ad.touches[0].clientX;var aa=ad.touches[0].clientY;if(ad.touches.length===2&&touch.startCount===2){var ac=L({x:ad.touches[1].clientX,y:ad.touches[1].clientY},{x:touch.startX,y:touch.startY});
-if(Math.abs(touch.startSpan-ac)>touch.threshold){touch.handled=true;if(ac<touch.startSpan){D();}else{T();}}}else{if(ad.touches.length===1){var Z=ab-touch.startX,Y=aa-touch.startY;
-if(Z>touch.threshold&&Math.abs(Z)>Math.abs(Y)){touch.handled=true;x();}else{if(Z<-touch.threshold&&Math.abs(Z)>Math.abs(Y)){touch.handled=true;i();}else{if(Y>touch.threshold){touch.handled=true;
-r();}else{if(Y<-touch.threshold){touch.handled=true;B();}}}}}}ad.preventDefault();}}function O(Y){touch.handled=false;}function m(Y){clearTimeout(mouseWheelTimeout);
-mouseWheelTimeout=setTimeout(function(){var Z=Y.detail||-Y.wheelDelta;if(Z>0){u();}else{Q();}},100);}function t(Y){E();}function G(){if(M&&!("msPerspective" in document.body.style)){var Z=document.querySelectorAll(".reveal .slides section a:not(.image)");
-for(var aa=0,Y=Z.length;aa<Y;aa++){var ab=Z[aa];if(ab.textContent&&!ab.querySelector("img")&&(!ab.className||!ab.classList.contains(ab,"roll"))){ab.classList.add("roll");
-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";
-aa.style.WebkitTransform=ah;aa.style.MozTransform=ah;aa.style.msTransform=ah;aa.style.OTransform=ah;aa.style.transform=ah;if(!aa.classList.contains("stack")){aa.addEventListener("click",z,true);
-}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)+"%)";
-af.setAttribute("data-index-h",ad);af.setAttribute("data-index-v",ac);af.style.display="block";af.style.WebkitTransform=ae;af.style.MozTransform=ae;af.style.msTransform=ae;
-af.style.OTransform=ae;af.style.transform=ae;af.addEventListener("click",z,true);}}}function T(){d.wrapper.classList.remove("overview");var ab=Array.prototype.slice.call(document.querySelectorAll(".reveal .slides section"));
-for(var aa=0,Y=ab.length;aa<Y;aa++){var Z=ab[aa];Z.style.WebkitTransform="";Z.style.MozTransform="";Z.style.msTransform="";Z.style.OTransform="";Z.style.transform="";
-Z.removeEventListener("click",z);}b();}function R(){return d.wrapper.classList.contains("overview");}function z(Y){if(R()){Y.preventDefault();T();k=this.getAttribute("data-index-h");
-c=this.getAttribute("data-index-v");b();}}function X(Z,ab){var ad=Array.prototype.slice.call(document.querySelectorAll(Z)),ae=ad.length;if(ae){if(K.loop){ab%=ae;
-if(ab<0){ab=ae+ab;}}ab=Math.max(Math.min(ab,ae-1),0);for(var ac=0;ac<ae;ac++){var Y=ad[ac];if(R()===false){var af=Math.abs((ab-ac)%(ae-3))||0;Y.style.display=af>3?"none":"block";
-}ad[ac].classList.remove("past");ad[ac].classList.remove("present");ad[ac].classList.remove("future");if(ac<ab){ad[ac].classList.add("past");}else{if(ac>ab){ad[ac].classList.add("future");
-}}if(Y.querySelector("section")){ad[ac].classList.add("stack");}}ad[ab].classList.add("present");var aa=ad[ab].getAttribute("data-state");if(aa){W=W.concat(aa.split(" "));
-}}else{ab=0;}return ab;}function b(ae,ai){v=C;var ab=W.concat();W.length=0;var ah=k,Z=c;k=X(j,ae===undefined?k:ae);c=X(a,ai===undefined?c:ai);stateLoop:for(var ac=0,af=W.length;
-ac<af;ac++){for(var aa=0;aa<ab.length;aa++){if(ab[aa]===W[ac]){ab.splice(aa,1);continue stateLoop;}}document.documentElement.classList.add(W[ac]);o(W[ac]);
-}while(ab.length){document.documentElement.classList.remove(ab.pop());}if(K.progress&&d.progress){d.progressbar.style.width=(k/(document.querySelectorAll(j).length-1))*window.innerWidth+"px";
-}if(R()){D();}p();clearTimeout(writeURLTimeout);writeURLTimeout=setTimeout(g,1500);var Y=document.querySelectorAll(j);var ag=Y[k],ad=ag.querySelectorAll("section");
-C=ad[c]||ag;if(k!==ah||c!==Z){o("slidechanged",{indexh:k,indexv:c,previousSlide:v,currentSlide:C});}else{v=null;}if(v){v.classList.remove("present");}}function p(){if(!K.controls||!d.controls){return;
-}var Y=f();[d.controlsLeft,d.controlsRight,d.controlsUp,d.controlsDown].forEach(function(Z){Z.classList.remove("enabled");});if(Y.left){d.controlsLeft.classList.add("enabled");
-}if(Y.right){d.controlsRight.classList.add("enabled");}if(Y.up){d.controlsUp.classList.add("enabled");}if(Y.down){d.controlsDown.classList.add("enabled");
-}}function f(){var Y=document.querySelectorAll(j);var Z=document.querySelectorAll(a);return{left:k>0,right:k<Y.length-1,up:c>0,down:c<Z.length-1};}function E(){var aa=window.location.hash.slice(2).split("/");
-var Z=parseInt(aa[0])||0;var Y=parseInt(aa[1])||0;I(Z,Y);}function g(){if(K.history){var Y="/";if(k>0||c>0){Y+=k;}if(c>0){Y+="/"+c;}window.location.hash=Y;
-}}function o(Z,Y){var aa=document.createEvent("HTMLEvents",1,2);aa.initEvent(Z,true,true);q(aa,Y);d.wrapper.dispatchEvent(aa);}function s(){if(document.querySelector(a+".present")){var Z=document.querySelectorAll(a+".present .fragment:not(.visible)");
-if(Z.length){Z[0].classList.add("visible");o("fragmentshown",{fragment:Z[0]});return true;}}else{var Y=document.querySelectorAll(j+".present .fragment:not(.visible)");
-if(Y.length){Y[0].classList.add("visible");o("fragmentshown",{fragment:Y[0]});return true;}}return false;}function J(){if(document.querySelector(a+".present")){var Z=document.querySelectorAll(a+".present .fragment.visible");
-if(Z.length){Z[Z.length-1].classList.remove("visible");o("fragmenthidden",{fragment:Z[Z.length-1]});return true;}}else{var Y=document.querySelectorAll(j+".present .fragment.visible");
-if(Y.length){Y[Y.length-1].classList.remove("visible");o("fragmenthidden",{fragment:Y[Y.length-1]});return true;}}return false;}function H(){clearTimeout(autoSlideTimeout);
-if(K.autoSlide){autoSlideTimeout=setTimeout(u,K.autoSlide);}}function I(Z,Y){b(Z,Y);}function x(){if(R()||J()===false){b(k-1,0);}}function i(){if(R()||s()===false){b(k+1,0);
-}}function r(){if(R()||J()===false){b(k,c-1);}}function B(){if(R()||s()===false){b(k,c+1);}}function Q(){if(J()===false){if(f().up){r();}else{var Y=document.querySelector(".reveal .slides>section.past:nth-child("+k+")");
-if(Y){c=(Y.querySelectorAll("section").length+1)||0;k--;b();}}}}function u(){if(s()===false){f().down?B():i();}H();}function P(){if(R()){T();}else{D();
-}}return{initialize:h,navigateTo:I,navigateLeft:x,navigateRight:i,navigateUp:r,navigateDown:B,navigatePrev:Q,navigateNext:u,toggleOverview:P,addEventListeners:A,removeEventListeners:N,getIndices:function(){return{h:k,v:c};
-},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
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