From 5461066521e9d92c9802e65d3f1d48c37abcb51c Mon Sep 17 00:00:00 2001
From: Anders Grendstadbakk <anders.2205@gmail.com>
Date: Thu, 6 Jun 2019 12:13:39 +0200
Subject: [PATCH 1/2] Add line number function

---
 src/LineNumbers.js             | 15 +++++++++++++++
 src/markdownSyntaxHighlight.js | 13 ++++++++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 src/LineNumbers.js

diff --git a/src/LineNumbers.js b/src/LineNumbers.js
new file mode 100644
index 0000000..bc8dd54
--- /dev/null
+++ b/src/LineNumbers.js
@@ -0,0 +1,15 @@
+function LineNumbers(lineCount) {
+  let lineNumbersWrapper = "";
+  if (!lineCount) {
+    return "";
+  }
+
+  const linesNum = lineCount;
+
+  const lines = new Array(linesNum + 1).join("<span></span>");
+  lineNumbersWrapper = `<span aria-hidden="true" class="line-numbers-rows">${lines}</span>`;
+
+  return lineNumbersWrapper;
+}
+
+module.exports = LineNumbers;
diff --git a/src/markdownSyntaxHighlight.js b/src/markdownSyntaxHighlight.js
index 531928d..1f9bdcf 100644
--- a/src/markdownSyntaxHighlight.js
+++ b/src/markdownSyntaxHighlight.js
@@ -1,6 +1,7 @@
 const Prism = require("prismjs");
 const PrismLoader = require("prismjs/components/index.js");
 const HighlightLinesGroup = require("./HighlightLinesGroup");
+const LineNumbers = require("./LineNumbers");
 
 module.exports = function(str, language) {
   if(!language) {
@@ -31,5 +32,15 @@ module.exports = function(str, language) {
     return highlights.getLineMarkup(j, line);
   });
 
-  return `<pre class="language-${language}"><code class="language-${language}">${highlightedLines.join("<br>")}</code></pre>`;
+
+  // Not sure how to configure this on/off
+  const numberLines = LineNumbers(highlightedLines.length);
+  const preClasses = [
+    `language-${language}`,
+  ];
+  if (numberLines !== "") {
+    preClasses.push("line-numbers");
+  }
+
+  return `<pre class="${preClasses.join(" ")}"><code class="language-${language}">${highlightedLines.join("<br>")}${numberLines}</code></pre>`;
 };

From f377959da9b51b2d49eeb00b8addd991a80ba7d0 Mon Sep 17 00:00:00 2001
From: Anders Grendstadbakk <anders.2205@gmail.com>
Date: Thu, 6 Jun 2019 12:27:28 +0200
Subject: [PATCH 2/2] Return empty variable

---
 src/LineNumbers.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/LineNumbers.js b/src/LineNumbers.js
index bc8dd54..6ca86a7 100644
--- a/src/LineNumbers.js
+++ b/src/LineNumbers.js
@@ -1,7 +1,7 @@
 function LineNumbers(lineCount) {
   let lineNumbersWrapper = "";
   if (!lineCount) {
-    return "";
+    return lineNumbersWrapper;
   }
 
   const linesNum = lineCount;