diff highlight

public/dist/code-styling.css

@@ -1 +1,2 @@
 .hljs{display:block;background:#fff;padding:.5em;color:#333;overflow-x:auto}.hljs-comment,.hljs-meta{color:#969896}.hljs-emphasis,.hljs-quote,.hljs-string,.hljs-strong,.hljs-template-variable,.hljs-variable{color:#df5000}.hljs-keyword,.hljs-selector-tag,.hljs-type{color:#a71d5d}.hljs-attribute,.hljs-bullet,.hljs-literal,.hljs-symbol{color:#0086b3}.hljs-name,.hljs-section{color:#63a35c}.hljs-tag{color:#333}.hljs-attr,.hljs-selector-attr,.hljs-selector-class,.hljs-selector-id,.hljs-selector-pseudo,.hljs-title{color:#795da3}.hljs-addition{color:#55a532;background-color:#eaffea}.hljs-deletion{color:#bd2c00;background-color:#ffecec}.hljs-link{text-decoration:underline}
+.diff{width:100%;display:inline-block}.diff-plus{color:green!important;background-color:rgba(0,128,0,.21)}.diff-minus{color:red!important;background-color:rgba(255,0,0,.21)}

src/frontend/js/classes/codeStyler.js

@@ -4,6 +4,7 @@ import xml from 'highlight.js/lib/languages/xml';
 import json from 'highlight.js/lib/languages/json';
 import css from 'highlight.js/lib/languages/css';
 import style from 'highlight.js/styles/github-gist.css'; // eslint-disable-line no-unused-vars
+import diffStyles from '../../styles/diff.pcss'; // eslint-disable-line no-unused-vars
 
 /**
  * @class CodeStyles
@@ -14,7 +15,7 @@ export default class CodeStyler {
    * @param {string} selector - CSS selector for code blocks
    * @param {string[]} languages - list of languages to highlight, see hljs.listLanguages()
    */
-  constructor({ selector, languages = ['javascript', 'xml', 'json', 'css'] }) {
+  constructor({selector, languages = ['javascript', 'xml', 'json', 'css']}) {
     this.codeBlocksSelector = selector;
     this.languages = languages;
     this.langsAvailable = {
@@ -47,6 +48,30 @@ export default class CodeStyler {
 
     Array.from(codeBlocks).forEach(block => {
       hljs.highlightBlock(block);
+      this.enumNodes(block.firstElementChild)
     });
   }
+
+  /**
+   * kjn
+   * @param node
+   */
+  enumNodes(node) {
+    while (node) {
+      const diffPlusRegEx = /\n([+].*)/ig;
+
+      if (diffPlusRegEx.test(node.innerHTML)) {
+        node.innerHTML = node.innerHTML.replace(diffPlusRegEx, '\n<span class="diff diff-plus">$1</span>');
+      }
+
+      const diffMinusRegEx = /\n([-].*)/ig;
+
+      if (diffMinusRegEx.test(node.innerHTML)) {
+        node.innerHTML = node.innerHTML.replace(diffMinusRegEx, '\n<span class="diff diff-minus">$1</span>');
+      }
+
+      this.enumNodes(node.firstElementChild);
+      node = node.nextSibling;
+    }
+  }
 }

src/frontend/styles/diff.pcss

@@ -0,0 +1,13 @@
+.diff {
+  width: 100%;
+  display: inline-block;
+  &-plus {
+    color: green !important;
+    background-color: rgba(0, 128, 0, 0.21);
+  }
+
+  &-minus {
+    color: red !important;
+    background-color: rgba(255, 0, 0, 0.21);
+  }
+}