Better version of data-trim on code snippets
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// START CUSTOM REVEAL.JS INTEGRATION
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(function() {
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// Function to perform a better "data-trim" on code snippets
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// Will slice an indentation amount on each line of the snippet (amount based on the line having the lowest indentation length)
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function betterTrim(snippetEl) {
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// Helper functions
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function trimLeft(val) {
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// Adapted from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/Trim#Polyfill
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return val.replace(/^[\s\uFEFF\xA0]+/g, '');
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}
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function trimLineBreaks(input) {
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var lines = input.split('\n');
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// Trim line-breaks from the beginning
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for (var i = 0; i < lines.length; i++) {
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if (lines[i].trim() === '') {
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lines.splice(i--, 1);
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} else break;
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}
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// Trim line-breaks from the end
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for (var i = lines.length-1; i >= 0; i--) {
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if (lines[i].trim() === '') {
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lines.splice(i, 1);
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} else break;
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}
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return lines.join('\n');
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}
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// Main function for betterTrim()
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return (function(snippetEl) {
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var content = trimLineBreaks(snippetEl.innerHTML);
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var lines = content.split('\n');
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// Calculate the minimum amount to remove on each line start of the snippet (can be 0)
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var pad = lines.reduce(function(acc, line) {
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if (line.length > 0 && trimLeft(line).length > 0 && acc > line.length - trimLeft(line).length) {
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return line.length - trimLeft(line).length;
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}
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return acc;
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}, Number.POSITIVE_INFINITY);
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// Slice each line with this amount
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return lines.map(function(line, index) {
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return line.slice(pad);
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})
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.join('\n');
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})(snippetEl);
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}
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if( typeof window.addEventListener === 'function' ) {
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var hljs_nodes = document.querySelectorAll( 'pre code' );
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@ -8,7 +55,7 @@
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// trim whitespace if data-trim attribute is present
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if( element.hasAttribute( 'data-trim' ) && typeof element.innerHTML.trim === 'function' ) {
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element.innerHTML = element.innerHTML.trim();
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element.innerHTML = betterTrim(element);
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}
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// Now escape html unless prevented by author
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