// Render KaTeX math typesetting, but only if the has the class // feature-math $( function() { if ( $( "body.feature-math:not(.feature-nomath)" ).length ) { renderMathInElement(document.body); } }); // Render abcjs sheet music, but only if the has the class // feature-music. Do this by removing the 

// and replacing it with a 
 which will be used to hold the
// generated sheet music. Remark's code syntax highlighting transforms the
//  block into a bunch of
//		
K: Emin

// one per line, so we have to reassemble those to get back linebreaks.
$( function() {
   if ( $( "body.feature-music:not(.feature-nomusic)" ).length ) {
      $( "code.language-abc, code.abc" ).each(function(i, e){
         var $this = $(this);
         var abc = $this.text();
			if ( $this.hasClass("remark-code") ) {
				abc = "";
				$this.children().each(function(i, e) {
					abc += "\n" + $(this).text();
				});
				abc = abc.trim();
			}
         var p = $this.parent().before('
');
         $this.parent().hide();
         ABCJS.renderAbc("music-" + (i+1), abc, {
            paddingtop: 0,
            paddingbottom: 0,
            paddingright: 0,
            paddingleft: 0,
            responsive: "resize"
         });
      });
   }
});

// Render tweet-styled blockquotes, if  has the class feature-tweetquote and the blockquote ends
// with a twitter permalink URL.
$( function() {
   if ( $( "body.feature-tweetquote:not(.feature-notweetquote)" ).length ) {
      $("blockquote p:first-child a[href*='twitter.com']").each(function(i, e){
         $(this.parentElement.parentElement).addClass("tweet sans-serif mw6");
         $(this).addClass("no-underline b");
         $(this).prepend('');
         var m = $(this).attr('href').match(/twitter.com\/([^\/]*)\//);
         if (m.length > 1) {
            $(this).append('
@' + m[1] + '');
         }
      });
   }
});

// Render perspective book images, if  has the class
// feature-3dbook-covers
$( function() {
   $( "body.feature-3dbook-covers article a" ).has( "img[src~='3dbook']" ).each(function(i, e) {
      $( this ).addClass("book");
      $( this ).parent().addClass("books");
   });
});

// Highlight code listings, if  has the class
// feature-highlight
$( function() {
   if ( $( "body.feature-highlight:not(.feature-nohighlight)" ).length ) {
		hljs.initHighlightingOnLoad();
   }
});

/* Turn images into figures with captions. Several scenarios are handled, in
 * order:
 * If the img is followed by an , then transform the  into a caption.
 * If the img has a title, use that as the caption.
 * If the img has an alt, use that.
 * The following features have to be enabled:
 * - feature-figcaption has to be enabled or the whole thing is disabled
 * - feature-figcaption-hidden makes the captions invisible till you hover
 * - feature-fignum adds figure numbering
 * - feature-figlink adds automatic links of text like "Figure 4"
 */
$( function() {
   $("body.feature-figcaption:not(.feature-nofigcaption) article img").each(function(i, e) {
      var $this = $(this);
      // Don't put captions on images that have URL fragment pseudo-classes.
      if ( $this.attr('src').match(/#/) ) return;
      var $txt = false;
      if ( $this.next().is("em") ) {
         $txt = $this.next().html();
         $this.next().remove();
      } else {
         $txt = $this.attr('title')   ? $this.attr('title')
              : $this.attr('alt')     ? $this.attr('alt')
              :                         false;
      }
      if ( $txt ) {
         var $fig = $this.wrap('
')
            .after('
' + $txt + '
')
            .parent();
      }
   });
   if ( $("body.feature-figlink").length ) {
      $("article p, article li").each(function(i, e) {
         var $old = $(this).html();
         var $new = $old.replace(/Figure\s+(\d+)/g, 'Figure $1');
         if ( $old !== $new ) {
            $(this).html($new);
         }
      });
   }
});

/* Add captions to tables.
 * If the table is followed by a 
, then transform the  into a caption.
 * The following features have to be enabled:
 * - feature-tablecaption has to be enabled or the whole thing is disabled
 * - feature-fignum adds table numbering
 * - feature-figlink adds automatic links of text like "Table 4"
 */
$( function() {
   $("body.feature-tablecaption article table").each(function(i, e) {
      var $this = $(this);
      var $txt = false;
      if ( $this.next().is("p") ) {
			if ( $this.next().children().first().is("em:only-child") ) {
				$txt = $this.next().children().first().html();
				$this.next().remove();
			}
      }
      if ( $txt ) {
         $this.prepend('' + $txt + '');
      }
   });
   if ( $("body.feature-figlink").length ) {
      $("article p, article li").each(function(i, e) {
         var $old = $(this).html();
         var $new = $old.replace(/Table\s+(\d+)/g, 'Table $1');
         if ( $old !== $new ) {
            $(this).html($new);
         }
      });
   }
});