--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/s6/js/jquery.slideshow.js	Fri Jun 21 14:14:31 2019 +0900
@@ -0,0 +1,535 @@
+
+var Slideshow = {
+
+  settings: {
+    debug: true
+  },
+
+  isProjection: false,   // are we in projection (slideshow) mode (in contrast to screen (outline) mode)?     
+  snum:   1,             // current slide # (non-zero based index e.g. starting with 1)
+  smax:   1,             // max number of slides 
+  incpos: 0,             // current step in slide  
+  steps:   null,
+
+  $slides: null,
+  $stylesProjection: null,
+  $stylesScreen: null,
+
+  slideClasses: [ 'far-past', 'past', 'current', 'next', 'far-next' ]
+};
+
+
+/************************************
+ * lets you define your own "global" transition function
+ *   passes in a reference to from and to slide wrapped in jQuery wrapper
+ *
+ *  see jquery.slideshow.transition.js for more examples
+ */
+
+Slideshow.transition = function( $from, $to ) {
+  // do nothing here; by default lets use css3 for transition effects
+}
+
+
+Slideshow.debug = function( msg ) {
+  if( this.settings.debug && window.console && window.console.log  )
+       window.console.log( '[debug] ' + msg );
+}
+
+
+Slideshow.init = function( options ) {
+
+  this.settings = $.extend({
+    mode              : 'slideshow', // slideshow | outline | autoplay
+    titleSelector     : 'h1',      
+    slideSelector     : '.slide',   // dummy (not yet working)
+    stepSelector      : '.step',    // dummy (not yet working)
+    debug             :  false,
+    normalize         :  true       // normalize selectors (that is, allow aliases
+                                    //  e.g. build,action,etc. for step and so on)
+  }, options || {});
+
+  this.isProjection = false; // are we in projection (slideshow) mode (in contrast to screen (outline) mode)?     
+  this.snum = 1;      // current slide # (non-zero based index e.g. starting with 1)
+  this.smax = 1;      // max number of slides 
+  this.incpos = 0;    // current step in slide  
+  this.steps  = null;
+
+  if( this.settings.normalize == true )
+    this.normalize();     
+
+  this.$slides = $( '.slide' );
+      
+  this.smax = this.$slides.length;
+  
+  this.addSlideIds();
+  this.steps = this.collectSteps();
+  this.updateSlides(); // mark slides w/ far-past,past,current,next,far-next
+
+  // $stylesProjection  holds all styles (<link rel="stylesheet"> or <style> w/ media type projection)
+  // $stylesScreen      holds all styles (<link rel="stylesheet"> or <style> w/ media type screen)
+
+  // add workaround for chrome
+  //  use screen,projection instead of projection
+  //  (without projection inline style tag gets not parsed into a styleSheet accesible via JavaScript)
+
+  this.$stylesProjection = $( 'link[media*=projection], style[media*=projection]' ).not('[rel*=less]').not('[type*=less]');
+  this.$stylesScreen     = $( 'link[media*=screen], style[media*=screen]' ).not('[media*=projection]').not('[rel*=less]').not('[type*=less]') ;
+   
+  $( document ).trigger( 'slideshow.init' );  // fire init for addons
+ 
+  this.addClicker();
+  
+       
+  // opera is the only browser currently supporting css projection mode 
+  this.notOperaFix();
+
+  // store possible slidenumber from hash */
+  // todo: use regex to extract number
+  //    might be #slide1 or just #1
+ 
+  var gotoSlideNum = parseInt( window.location.hash.substring(1) );
+  this.debug( "gotoSlideNum=" + gotoSlideNum );
+
+  if( !isNaN( gotoSlideNum ))
+  {
+    this.debug( "restoring slide on (re)load #: " + gotoSlideNum );
+    this.goTo( gotoSlideNum );
+  }
+
+  if( this.settings.mode == 'outline' ) 
+    this.toggle();
+
+  $( document ).trigger( 'slideshow.start' );  // fire start for addons
+      
+  $( document ).on( 'keyup', $.proxy( Slideshow.keys, this ));
+} // end init() 
+ 
+ 
+Slideshow.normalize = function() {
+
+  // check for .presentation aliases, that is, .deck, .slides
+  $( '.deck, .slides' ).addClass( 'presentation' );
+
+  // add slide class to immediate children
+  // todo: use autoslide option that lets you turn on/off option?
+  $( '.presentation' ).children().addClass( 'slide' );
+
+  // todo: scope with .slide?? e.g  .slide .incremental
+  // todo: make removing "old" class an option??
+
+  // check for .step aliases, that is, .incremental, .delayed, .action, .build
+  $( '.incremental, .delayed, .action, .build' ).addClass( 'step' );
+
+  // check for .notes aliases, that is, .note, .handout
+  $( '.note, .handout' ).addClass( 'notes' );
+
+}
+
+Slideshow.notOperaFix = function() {
+   // 1) switch media type from projection to screen
+
+   var self = this;   // NOTE: jquery binds this in .each to element
+
+   this.$stylesProjection.each( function(i) {
+     var styleProjection = this;
+     // note: no longer used; workaround for chrome needs screen,projection to make it work (thus, no need to switch to screen)
+     // styleProjection.media = 'screen';
+     styleProjection.disabled = true;
+     
+     self.debug( "notOperaFix - stylesProjection["+i+"] switching media type from projection to screen" );
+   } );
+   
+   this.isProjection = false;
+   
+   // 2) disable screen styles and enable projection styles (thus, switch into projection mode)
+   this.toggle();
+   
+   // now we should be in project mode
+} // end notOperatFix()
+
+
+Slideshow.toggle = function() {
+  // todo: use settings.isProjection for state tracking
+  //  and change disable accordingly (plus assert that all styles are in the state as expected)
+
+  // toggle between projection (slide show) mode
+  //   and screen (outline) mode
+
+  var self = this;   // NOTE: jquery binds this in .each to element
+
+  this.$stylesProjection.each( function(i) {          
+     var styleProjection = this;
+     
+     styleProjection.disabled = !styleProjection.disabled;
+       
+     self.debug( "toggle - stylesProjection["+i+"] disabled? " + styleProjection.disabled );
+   });
+  
+  this.$stylesScreen.each( function(i) {          
+     var styleScreen = this;
+
+     styleScreen.disabled = !styleScreen.disabled;
+       
+     self.debug( "toggle - stylesScreen["+i+"] disabled? " + styleScreen.disabled );
+     
+     // update isProjection flag 
+     self.isProjection = styleScreen.disabled;
+   });
+  
+/*
+ * note: code no longer needed; using (adding/removing) css classes hide/show)
+ *
+
+  if( this.isProjection )
+  {
+    this.$slides.each( function(i) {
+      if( i == (self.snum-1) )
+        $(this).show();
+      else
+        $(this).hide();
+    });    
+  }
+  else
+  {
+    this.$slides.show();
+  }
+*/
+} // end toggle()
+
+  
+Slideshow.updatePermaLink = function()
+{
+  // todo: unify hash marks??; use #1 for div ids instead of #slide1? 
+  window.location.hash = '#'+ this.snum;
+}
+
+Slideshow.goTo = function( target )
+{
+ if( target > this.smax || target == this.snum )
+   return;
+
+ this.go( target - this.snum );
+}
+ 
+Slideshow.go = function( dir )
+{
+  this.debug( 'go: ' + dir );
+  
+  if( dir == 0 ) return;  /* same slide; nothing to do */
+
+  var cid = '#slide' + this.snum;   /* current slide (selector) id */
+  var csteps = this.steps[ this.snum-1 ];  /* current slide steps array */
+
+  /* remove all step and stepcurrent classes from current slide */
+  if( csteps.length > 0) {
+     $( csteps ).each( function() {
+       $(this).removeClass( 'step' ).removeClass( 'stepcurrent' );
+     } );
+   }
+
+  /* set snum to next slide */
+  this.snum += dir;
+  if( this.snum > this.smax ) this.snum = this.smax;
+  if( this.snum < 1 ) this.snum = 1;
+  
+  var nid = '#slide' + this.snum;  /* next slide (selector) id */
+  var nsteps = this.steps[this.snum-1]; /* next slide steps array */
+  
+	if( dir < 0 ) /* go backwards? */
+	{
+		this.incpos = nsteps.length;
+		/* mark last step as current step */
+		if( nsteps.length > 0 ) 
+			$( nsteps[this.incpos-1] ).addClass( 'stepcurrent' );		
+	}
+	else /* go forwards? */
+	{
+		this.incpos = 0;
+	  if( nsteps.length > 0 ) {
+		  $( nsteps ).each( function() {
+				$(this).addClass( 'step' ).removeClass( 'stepcurrent' );
+			} );
+		}
+	}	
+	
+  if( !(cid == nid) ) {
+    this.updateSlides();
+
+    this.debug( "transition from " + cid + " to " + nid );
+    this.transition( $( cid ), $( nid ) );
+
+    // only fire change event if slide changes
+    $( document ).trigger( 'slideshow.change', [$( cid ), $( nid )]);
+  }
+  
+  this.updatePermaLink();
+} // end go()
+
+
+Slideshow.updateSlideClass = function( $slide, className )
+{
+  if( className )
+    $slide.addClass( className );
+  
+  for( var i in this.slideClasses )
+  {
+    if( className != this.slideClasses[i] )
+      $slide.removeClass( this.slideClasses[i] );
+  }
+}
+
+Slideshow.updateSlides = function()
+{
+  var self = this;
+  this.$slides.each( function( i ) {
+    switch( i ) {
+      case (self.snum-1)-2:
+        self.updateSlideClass( $(this), 'far-past' );
+        break;
+      case (self.snum-1)-1:
+        self.updateSlideClass( $(this), 'past' );
+        break;
+      case (self.snum-1):
+        self.updateSlideClass( $(this), 'current' );
+        break;
+      case (self.snum-1)+1:
+        self.updateSlideClass( $(this), 'next' );
+        break;
+      case (self.snum-1)+2:
+        self.updateSlideClass( $(this), 'far-next' );
+        break;
+      default:
+        self.updateSlideClass( $(this) );
+        break;
+     }
+  });
+}
+
+
+
+Slideshow.subgo = function( dir )
+{
+   this.debug( 'subgo: ' + dir + ', incpos before: ' + this.incpos + ', after: ' + (this.incpos+dir) );
+	
+	var csteps = this.steps[this.snum-1]; /* current slide steps array */
+	
+	if( dir > 0)
+  {  /* go forward? */
+		if( this.incpos > 0 )
+      $( csteps[this.incpos-1] ).removeClass( 'stepcurrent' );
+		$( csteps[this.incpos] ).removeClass( 'step').addClass( 'stepcurrent' ); 
+		this.incpos++;
+	}
+  else
+  { /* go backwards? */
+		this.incpos--;
+		$( csteps[this.incpos] ).removeClass( 'stepcurrent' ).addClass( 'step' );
+		if( this.incpos > 0 )
+      $( csteps[this.incpos-1] ).addClass( 'stepcurrent' );
+	}
+} // end subgo()
+
+
+Slideshow.keys = function( key )
+{  
+  this.debug( "enter keys()" );
+  
+  if( !key ) {
+    key = event;
+    key.which = key.keyCode;
+  }
+  if( key.which == 84 ) {
+    this.toggle();  // toggle between project and screen css media mode 
+    return;
+  }
+  if( this.isProjection ) {
+    switch( key.which ) {
+      case 32: // spacebar
+      case 34: // page down
+      case 39: // rightkey
+      case 40: // downkey
+
+      var csteps = this.steps[this.snum-1]; /* current slide steps array */
+        
+      if( !csteps || this.incpos >= csteps.length ) {
+					this.go(1);
+				} else {
+					this.subgo(1);
+				}
+				break;
+			case 33: // page up
+			case 37: // leftkey
+			case 38: // upkey
+					
+					if( !this.steps[this.snum-1] || this.incpos <= 0 ) {
+					  this.go(-1);
+				  } else {
+					  this.subgo(-1);
+					}
+				  break;
+      case 36: // home
+				this.goTo(1);
+				break;
+			case 35: // end
+				this.goTo( this.smax );
+				break;   
+      case 68: // d
+        this.toggleDebug();
+        break;
+		}
+		$( document ).trigger( 'slideshow.keys', key );
+	}
+} // end keys()
+
+
+Slideshow.toggleDebug = function()
+{
+   this.settings.debug = !this.settings.debug;
+   this.doDebug();
+}
+
+Slideshow.doDebug = function()
+{
+   if( this.settings.debug == true )
+   {
+      $( document ).trigger( 'slideshow.debug.on' );
+   }
+   else
+   {
+      $( document ).trigger( 'slideshow.debug.off' );
+   }
+}
+
+Slideshow.collectStepsWorker = function(obj)
+{
+  var self = this;   // NOTE: jquery binds this in .each,.click, etc to element
+  
+  var steps = []; 
+  if( !obj ) 
+    return steps;
+	
+  $(obj).children().each( function() {
+    if( $(this).hasClass( 'step' ) ) {
+		
+      self.debug( 'step found for ' + this.tagName );
+      $(this).removeClass( 'step' );
+
+      /* don't add enclosing list; instead add step class to all list items/children */
+      if( $(this).is( 'ol,ul' ) ) {
+	self.debug( '  ol or ul found; adding auto steps' );
+	$(this).children().addClass( 'step' );
+      }
+      else
+      {
+	steps.push( this )
+      }
+    }
+    steps = steps.concat( self.collectStepsWorker( this ) );
+  });
+	
+  return steps;
+} // end collectStepWorkers
+
+Slideshow.collectSteps = function()
+{
+  var self = this;   // NOTE: jquery binds this in .each,.click, etc to element
+	
+  var steps = [];
+
+  this.$slides.each( function(i) {
+    self.debug ( 'collectSteps for ' + this.id + ':' );
+    steps[i] = self.collectStepsWorker( this );
+  });
+	
+  $( steps ).each( function(i) {
+    self.debug( 'slide ' + (i+1) + ': found ' + this.length + ' steps' );	
+  });
+       
+  return steps;
+} // end collectSteps()
+
+
+Slideshow.addClicker = function()
+{
+  var self = this;   // NOTE: jquery binds this in .each,.click, etc to element
+
+  // if you click on heading of slide -> go to next slide (or next step)
+   
+  $( this.settings.titleSelector, this.$slides ).click( function( ev ) {
+    if(ev.which != 1) return;  // only process left clicks (e.g 1; middle and rightclick use 2 and 3)
+
+    if( !self.isProjection )  // suspend clicker in outline view (just slideshow view)
+      return;
+     
+    var csteps = self.steps[self.snum-1]; // current slide steps array 
+    if ( !csteps || self.incpos >= csteps.length ) 
+      self.go(1);
+    else 
+      self.subgo(1);
+  });
+   
+   
+   $( this.settings.titleSelector, this.$slides ).on('contextmenu', function() { 
+      if( !self.isProjection )  // suspend clicker in outline view (just slideshow view)
+        return;
+
+      var csteps = self.steps[self.snum-1]; // current slide steps array 
+      if ( !csteps || self.incpos >= csteps.length ) 
+         self.go(-1);
+      else 
+         self.subgo(-1);
+
+      return false;
+   } );       
+} // end addClicker()
+
+
+Slideshow.addSlideIds = function() {
+  this.$slides.each( function(i) {
+    this.id = 'slide'+(i+1);
+  });
+}
+
+
+Slideshow.addStyles = function() {
+  this.debug( 'add builtin css via inline style elements' );
+  
+   var styleProjection =
+"<style media='screen,projection'>           \n"+
+" .slide  { display: block;  }               \n"+
+" .notes  { display: none;   }               \n"+
+" .layout { display: block;  }               \n"+
+"</style>";
+
+   var styleScreen =
+"<style media='screen'>                      \n"+
+"/****                                           \n"+
+" * hide layout stuff (header, footer, navLinks, navList etc.) \n"+
+" */                                             \n"+
+"                                                \n"+
+" .layout * { display: none; }                   \n"+
+"</style>";
+
+   var stylePrint =
+"<style media='print'>                              \n"+
+"                                                   \n"+
+" .slide { display: block !important; }             \n"+
+" .layout, .layout * { display: none !important; }  \n"+
+"                                                   \n"+
+"/******                                            \n"+
+" * Turn on print-specific stuff/classes            \n"+
+" */                                                \n"+
+"                                                   \n"+
+" .extra { display: block !important; }             \n"+
+"</style>";
+
+   // note: use prepend (not append) to make sure this
+   // styles come first (and do not overrule user supplied styles)
+
+    $( 'head' ).prepend( styleProjection );
+    $( 'head' ).prepend( styleScreen );
+    $( 'head' ).prepend( stylePrint );
+}
+
+Slideshow.addStyles();