presentazione-papero/plugin/highlight/highlight.js

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// START CUSTOM REVEAL.JS INTEGRATION
var RevealHighlight = (function() {
	// Function to perform a better "data-trim" on code snippets
	// Will slice an indentation amount on each line of the snippet (amount based on the line having the lowest indentation length)
	function betterTrim(snippetEl) {
		// Helper functions
		function trimLeft(val) {
			// Adapted from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/Trim#Polyfill
			return val.replace(/^[\s\uFEFF\xA0]+/g, '');
		}
		function trimLineBreaks(input) {
			var lines = input.split('\n');

			// Trim line-breaks from the beginning
			for (var i = 0; i < lines.length; i++) {
				if (lines[i].trim() === '') {
					lines.splice(i--, 1);
				} else break;
			}

			// Trim line-breaks from the end
			for (var i = lines.length-1; i >= 0; i--) {
				if (lines[i].trim() === '') {
					lines.splice(i, 1);
				} else break;
			}

			return lines.join('\n');
		}

		// Main function for betterTrim()
		return (function(snippetEl) {
			var content = trimLineBreaks(snippetEl.innerHTML);
			var lines = content.split('\n');
			// Calculate the minimum amount to remove on each line start of the snippet (can be 0)
			var pad = lines.reduce(function(acc, line) {
				if (line.length > 0 && trimLeft(line).length > 0 && acc > line.length - trimLeft(line).length) {
					return line.length - trimLeft(line).length;
				}
				return acc;
			}, Number.POSITIVE_INFINITY);
			// Slice each line with this amount
			return lines.map(function(line, index) {
				return line.slice(pad);
			})
			.join('\n');
		})(snippetEl);
	}

	return {
		init: function() {

			var hljs_nodes = document.querySelectorAll( 'pre code' );

			for( var i = 0, len = hljs_nodes.length; i < len; i++ ) {
				var element = hljs_nodes[i];

				// trim whitespace if data-trim attribute is present
				if( element.hasAttribute( 'data-trim' ) && typeof element.innerHTML.trim === 'function' ) {
					element.innerHTML = betterTrim(element);
				}

				// Now escape html unless prevented by author
				if( ! element.hasAttribute( 'data-noescape' )) {
					element.innerHTML = element.innerHTML.replace(/</g,"&lt;").replace(/>/g,"&gt;");
				}

				// re-highlight when focus is lost (for edited code)
				element.addEventListener( 'focusout', function( event ) {
					hljs.highlightBlock( event.currentTarget );
				}, false );
			}

			hljs.initHighlightingOnLoad();

			// lofi xbrowser Promise.resolve()
			return { then: function( resolve ) { resolve(); }};

		}
	}
})();

Reveal.registerPlugin( 'highlight', RevealHighlight );
// END CUSTOM REVEAL.JS INTEGRATION