Added implementation of relative links #7

Author: yauhenipakala

README.md

@@ -56,5 +56,26 @@ $(document).ready(function() {
 });
 ```
 
+## Additional features
+
+#### Links
+```js
+hljs.initLineNumbersOnLoad({
+	withLinks: true
+});
+```
+
+```css
+.hljs-line-numbers a {
+	text-decoration: none;
+	color: #999;
+}
+.hljs-line-numbers a:target {
+	color: #ff0000;
+	text-decoration: underline;
+	outline: none;
+}
+```
+
 ---
 © 2015 Yauheni Pakala | MIT License

dist/highlightjs-line-numbers.min.js

@@ -8,14 +8,23 @@
 		w.hljs.lineNumbersBlock = lineNumbersBlock;
 	}
 
-	function initLineNumbersOnLoad () {
+	var defaultOptions = {
+		withLinks: false
+	};
+
+	function initLineNumbersOnLoad (options) {
+		options = options || defaultOptions;
+
 		w.addEventListener('load', function () {
 			try {
 				var blocks = document.querySelectorAll('code.hljs');
 
 				for (var i in blocks) {
 					if (blocks.hasOwnProperty(i)) {
-						lineNumbersBlock(blocks[i]);
+						lineNumbersBlock(blocks[i], {
+							blockName: 'c' + i,
+							withLinks: options.withLinks
+						});
 					}
 				}
 			} catch (e) {
@@ -24,28 +33,37 @@
 		});
 	}
 
-	function lineNumbersBlock (element) {
+	function lineNumbersBlock (element, options) {
 		if (typeof element !== 'object') return;
+		if (!!options) {
+			options.withLinks = options.withLinks || false;
+			options.blockName = options.blockName || false;
+		} else {
+			options = defaultOptions;
+			options.blockName = '';
+		}
 
 		var parent = element.parentNode;
 		var lines = getCountLines(parent.textContent);
 
 		if (lines > 1) {
 			var l = '';
 			for (var i = 0; i < lines; i++) {
-				l += (i + 1) + '\n';
+				l +=  options.withLinks
+					? getLineWithLink(i + 1, options.blockName)
+					: (i + 1) + '\n';
 			}
 
 			var linesPanel = document.createElement('code');
 			linesPanel.className = 'hljs hljs-line-numbers';
 			linesPanel.style.float = 'left';
-			linesPanel.textContent = l;
+			linesPanel.innerHTML = l;
 
 			parent.insertBefore(linesPanel, element);
 		}
 	}
 
-	function getCountLines(text) {
+	function getCountLines (text) {
 		if (text.length === 0) return 0;
 
 		var regExp = /\r\n|\r|\n/g;
@@ -58,4 +76,9 @@
 
 		return lines;
 	}
+
+	function getLineWithLink (i, blockName) {
+		var id = blockName + '_l' + i;
+		return '<a href="#' + id + '" id="' + id + '">' + i + '</span>\n'
+	}
 }(window));