Added basic impl

Author: wcoder

.gitignore

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+node_modules/

dist/highlightjs-lang.min.js

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+var gulp = require('gulp');
+var uglify = require('gulp-uglify');
+var rename = require("gulp-rename");
+
+gulp.task('build', function() {
+	return gulp.src('src/*.js')
+		.pipe(uglify())
+		.pipe(rename({
+			extname: '.min.js'
+		}))
+		.pipe(gulp.dest('dist'));
+});

gulpfile.js

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+{
+  "name": "highlightjs-lang.js",
+  "version": "1.0.0",
+  "description": "Highlight.js plugin for show of used syntax language.",
+  "main": "gulpfile.js",
+  "dependencies": {},
+  "devDependencies": {
+    "gulp": "^3.8.11",
+    "gulp-rename": "^1.2.2",
+    "gulp-uglify": "^1.2.0"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/wcoder/highlightjs-lang.js.git"
+  },
+  "author": "Yauheni Pakala <[email protected]>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/wcoder/highlightjs-lang.js.git/issues"
+  },
+  "homepage": "https://github.com/wcoder/highlightjs-lang.js.git"
+}

package.json

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+(function (w) {
+	'use strict';
+
+	if (typeof w.hljs === 'undefined') {
+		console.error('highlight.js not detected!');
+	} else {
+		w.hljs.initLineNumbersOnLoad = initLineNumbersOnLoad;
+		w.hljs.lineNumbersBlock = lineNumbersBlock;
+	}
+
+	function initLineNumbersOnLoad () {
+		w.addEventListener('load', function () {
+			try {
+				var blocks = document.querySelectorAll('code.hljs');
+
+				for (var i in blocks) {
+					if (blocks.hasOwnProperty(i)) {
+						lineNumbersBlock(blocks[i]);
+					}
+				}
+			} catch (e) {
+				console.error('highlight-lang error: ', e);
+			}
+		});
+	}
+
+	function lineNumbersBlock (element) {
+		if (typeof element !== 'object') return;
+
+		var classes = element.className.split(' ');
+		var lang = getLangNameFromClasses(classes);
+
+		if (lang !== '') {
+			var langPanel = document.createElement('div');
+			langPanel.className = 'hljs-lang';
+			langPanel.textContent = convertLangName(lang);
+			element.parentNode.insertBefore(langPanel, element);
+		}
+	}
+
+	function getLangNameFromClasses(classes) {
+		// TODO: define lang for auto-syntax
+		if (!!classes && classes.length > 1 && classes[1] === 'hljs') {
+			return classes[0];
+		}
+		return '';
+	}
+
+	function convertLangName(lang)
+	{
+		// TODO: add more
+		var map = [
+			['C#', ['cs', 'csharp']],
+			['F#', ['fsharp']],
+			['Objective-C', ['objectivec']]
+		];
+
+		map.forEach(function (e) {
+			if (e[1].indexOf(lang) !== -1) {
+				lang = e[0];
+				return;
+			}
+		});
+		return lang;
+	}
+
+}(window));