add es2015 & optimize banner

.babelrc

@@ -0,0 +1,3 @@
+{
+	"presets": ["es2015"]
+}

debug/simplemde.css

@@ -94,8 +94,14 @@
 
 .cm-tab { display: inline-block; text-decoration: inherit; }
 
+.CodeMirror-rulers {
+  position: absolute;
+  left: 0; right: 0; top: -50px; bottom: -20px;
+  overflow: hidden;
+}
 .CodeMirror-ruler {
   border-left: 1px solid #ccc;
+  top: 0; bottom: 0;
   position: absolute;
 }
 
@@ -206,9 +212,6 @@ div.CodeMirror span.CodeMirror-nonmatchingbracket {color: #f22;}
   display: inline-block;
   vertical-align: top;
   margin-bottom: -30px;
-  /* Hack to make IE7 behave */
-  *zoom:1;
-  *display:inline;
 }
 .CodeMirror-gutter-wrapper {
   position: absolute;
@@ -252,8 +255,8 @@ div.CodeMirror span.CodeMirror-nonmatchingbracket {color: #f22;}
   position: relative;
   overflow: visible;
   -webkit-tap-highlight-color: transparent;
-  -webkit-font-variant-ligatures: none;
-  font-variant-ligatures: none;
+  -webkit-font-variant-ligatures: contextual;
+  font-variant-ligatures: contextual;
 }
 .CodeMirror-wrap pre {
   word-wrap: break-word;
@@ -297,7 +300,10 @@ div.CodeMirror span.CodeMirror-nonmatchingbracket {color: #f22;}
   visibility: hidden;
 }
 
-.CodeMirror-cursor { position: absolute; }
+.CodeMirror-cursor {
+  position: absolute;
+  pointer-events: none;
+}
 .CodeMirror-measure pre { position: static; }
 
 div.CodeMirror-cursors {
@@ -324,9 +330,6 @@ div.CodeMirror-dragcursors {
   background: rgba(255, 255, 0, .4);
 }
 
-/* IE7 hack to prevent it from returning funny offsetTops on the spans */
-.CodeMirror span { *vertical-align: text-bottom; }
-
 /* Used to force a border model for a node */
 .cm-force-border { padding-right: .1px; }
 

gulpfile.babel.js

@@ -1,26 +1,25 @@
 "use strict";
+import babelify from 'babelify'
+import gulp from 'gulp'
+import minifycss from 'gulp-clean-css'
+import uglify from 'gulp-uglify'
+import concat from 'gulp-concat'
+import header from 'gulp-header'
+import buffer from 'vinyl-buffer'
+import pkg from './package.json'
+import debug from 'gulp-debug'
+import eslint from 'gulp-eslint'
+import prettify from 'gulp-jsbeautifier'
+import browserify from 'browserify'
+import source from 'vinyl-source-stream'
+import rename from 'gulp-rename'
 
-var gulp = require("gulp"),
-	minifycss = require("gulp-clean-css"),
-	uglify = require("gulp-uglify"),
-	concat = require("gulp-concat"),
-	header = require("gulp-header"),
-	buffer = require("vinyl-buffer"),
-	pkg = require("./package.json"),
-	debug = require("gulp-debug"),
-	eslint = require("gulp-eslint"),
-	prettify = require("gulp-jsbeautifier"),
-	browserify = require("browserify"),
-	source = require("vinyl-source-stream"),
-	rename = require("gulp-rename");
-
-var banner = ["/**",
-	" * <%= pkg.name %> v<%= pkg.version %>",
-	" * Copyright <%= pkg.company %>",
-	" * @link <%= pkg.homepage %>",
-	" * @license <%= pkg.license %>",
-	" */",
-	""].join("\n");
+const banner = `/**
+ * <%= pkg.name %> v<%= pkg.version %>
+ * Copyright <%= pkg.company %>
+ * @link <%= pkg.homepage %>
+ * @license <%= pkg.license %>
+ */\n`
 
 gulp.task("prettify-js", [], function() {
 	return gulp.src("./src/js/simplemde.js")
@@ -44,6 +43,7 @@ gulp.task("lint", ["prettify-js"], function() {
 
 function taskBrowserify(opts) {
 	return browserify("./src/js/simplemde.js", opts)
+		.transform("babelify", {presets: ['es2015', 'stage-3']})
 		.bundle();
 }
 

package.json

@@ -26,20 +26,24 @@
     "marked": "*"
   },
   "devDependencies": {
+    "babel-core": "^6.21.0",
+    "babel-preset-es2015": "^6.18.0",
+    "babel-preset-stage-3": "^6.17.0",
+    "babelify": "^7.3.0",
     "browserify": "*",
     "debug": "*",
     "eslint": "*",
     "gulp": "*",
+    "gulp-clean-css": "*",
     "gulp-concat": "*",
     "gulp-debug": "*",
     "gulp-eslint": "*",
     "gulp-header": "*",
     "gulp-jsbeautifier": "*",
-    "gulp-clean-css": "*",
     "gulp-rename": "*",
     "gulp-uglify": "*",
-    "vinyl-source-stream": "*",
-    "vinyl-buffer": "*"
+    "vinyl-buffer": "*",
+    "vinyl-source-stream": "*"
   },
   "repository": {
     "type": "git",