Fix Selecting a language and then going back to auto

- Closes #37

lib/constants.js

@@ -1,4 +1,4 @@
-import { toHash } from './util'
+import toHash from 'tohash'
 
 export const THEMES_ARRAY = [
   {
@@ -73,7 +73,8 @@ export const THEMES = toHash(THEMES_ARRAY)
 
 export const LANGUAGES = [
   {
-    name: 'Auto'
+    name: 'Auto',
+    module: 'auto'
   },
   {
     name: 'Plain Text'
@@ -291,7 +292,9 @@ const unfold = (f, seed) => {
 }`
 
 if (typeof window !== 'undefined' && typeof window.navigator !== 'undefined') {
-  LANGUAGES.forEach((language) => {
+  LANGUAGES
+    .filter(language => language.module !== 'auto')
+    .forEach((language) => {
     if (language.module) {
       !language.custom
         ? require(`codemirror/mode/${language.module}/${language.module}`)

lib/util.js

@@ -1,10 +0,0 @@
-export const toHash = (array) => {
-  return array.reduce((hash, item) => {
-    const id = item.id
-    if (hash[id]) {
-      throw new Error('ID already exists')
-    }
-    hash[id] = item
-    return hash
-  }, {})
-}