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-rw-r--r--plugin/highlight/highlight.js49
1 files changed, 48 insertions, 1 deletions
diff --git a/plugin/highlight/highlight.js b/plugin/highlight/highlight.js
index 8be8c98..6aae081 100644
--- a/plugin/highlight/highlight.js
+++ b/plugin/highlight/highlight.js
@@ -1,5 +1,52 @@
// START CUSTOM REVEAL.JS INTEGRATION
(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);
+ }
+
if( typeof window.addEventListener === 'function' ) {
var hljs_nodes = document.querySelectorAll( 'pre code' );
@@ -8,7 +55,7 @@
// trim whitespace if data-trim attribute is present
if( element.hasAttribute( 'data-trim' ) && typeof element.innerHTML.trim === 'function' ) {
- element.innerHTML = element.innerHTML.trim();
+ element.innerHTML = betterTrim(element);
}
// Now escape html unless prevented by author