init: function()

in plugin/markdown/plugin.js [425:480]
30 lines of code
6 McCabe index (conditional complexity)

		init: function( reveal ) {

			deck = reveal;

			let { renderer, animateLists, ...markedOptions } = deck.getConfig().markdown || {};

			if( !renderer ) {
				renderer = new marked.Renderer();

				renderer.code = ( code, language ) => {

					// Off by default
					let lineNumberOffset = '';
					let lineNumbers = '';

					// Users can opt in to show line numbers and highlight
					// specific lines.
					// ```javascript []        show line numbers
					// ```javascript [1,4-8]   highlights lines 1 and 4-8
					// optional line number offset:
					// ```javascript [25: 1,4-8]   start line numbering at 25,
					//                             highlights lines 1 (numbered as 25) and 4-8 (numbered as 28-32)
					if( CODE_LINE_NUMBER_REGEX.test( language ) ) {
						let lineNumberOffsetMatch =  language.match( CODE_LINE_NUMBER_REGEX )[2];
						if (lineNumberOffsetMatch){
							lineNumberOffset =  `data-ln-start-from="${lineNumberOffsetMatch.trim()}"`;
						}

						lineNumbers = language.match( CODE_LINE_NUMBER_REGEX )[3].trim();
						lineNumbers = `data-line-numbers="${lineNumbers}"`;
						language = language.replace( CODE_LINE_NUMBER_REGEX, '' ).trim();
					}

					// Escape before this gets injected into the DOM to
					// avoid having the HTML parser alter our code before
					// highlight.js is able to read it
					code = escapeForHTML( code );

					// return `<pre><code ${lineNumbers} class="${language}">${code}</code></pre>`;

					return `<pre><code ${lineNumbers} ${lineNumberOffset} class="${language}">${code}</code></pre>`;
				};
			}

			if( animateLists === true ) {
				renderer.listitem = text => `<li class="fragment">${text}</li>`;
			}

			marked.setOptions( {
				renderer,
				...markedOptions
			} );

			return processSlides( deck.getRevealElement() ).then( convertSlides );

		},