Fall back to local style store

And convert tabs to spaces in process

src/apistore.js

@@ -1,14 +1,13 @@
 import request from 'request'
 import style from './style.js'
 
-// Empty style is always used if no style could be restored or fetched
-export const emptyStyle = style.ensureMetadataExists(style.fromJSON({
-		version: 8,
-		sources: {},
-		layers: [],
-}))
-
 export class ApiStyleStore {
+  supported(cb) {
+    request('http://localhost:8000/styles', (error, response, body) => {
+      cb(error === undefined)
+    })
+  }
+
   latestStyle(cb) {
     if(this.latestStyleId) {
       request('http://localhost:8000/styles/' + this.latestStyleId, (error, response, body) => {

src/app.jsx

@@ -9,8 +9,8 @@ import Fixed from 'rebass/dist/Fixed'
 import { Map } from './map.jsx'
 import {Toolbar} from './toolbar.jsx'
 import style from './style.js'
-import { loadDefaultStyle, SettingsStore } from './stylestore.js'
+import { loadDefaultStyle, SettingsStore, StyleStore } from './stylestore.js'
-import { emptyStyle, ApiStyleStore } from './apistore.js'
+import { ApiStyleStore } from './apistore.js'
 import { WorkspaceDrawer } from './workspace.jsx'
 
 import theme from './theme.js'
@@ -24,22 +24,22 @@ export default class App extends React.Component {
 
   constructor(props) {
     super(props)
+
     this.styleStore = new ApiStyleStore()
+    this.styleStore.supported(isSupported => {
+      if(!isSupported) {
+        console.log('Falling back to local storage for storing styles')
+        this.styleStore = new StyleStore()
+      }
+      this.styleStore.latestStyle(mapStyle => this.onStyleUpload(mapStyle))
+    })
+
     this.settingsStore = new SettingsStore()
     this.state = {
       accessToken: this.settingsStore.accessToken,
       workContext: "layers",
-      currentStyle: emptyStyle
+      currentStyle: style.emptyStyle
     }
-
-    this.styleStore.latestStyle(mapStyle => {
-      this.onStyleUpload(mapStyle)
-    })
-    /*
-		if(this.state.currentStyle.get('layers').size === 0) {
-			loadDefaultStyle(mapStyle => this.onStyleUpload(mapStyle))
-		}
-    */
   }
 
   onReset() {

src/style.js

@@ -25,6 +25,13 @@ function fromJSON(jsonStyle) {
   }))
 }
 
+// Empty style is always used if no style could be restored or fetched
+const emptyStyle = ensureMetadataExists(fromJSON({
+  version: 8,
+  sources: {},
+  layers: [],
+}))
+
 function ensureHasId(style) {
   if(style.has('id')) return style
   return style.set('id', Math.random().toString(36).substr(2, 9))
@@ -81,4 +88,5 @@ export default {
   fromJSON,
   diffStyles,
   ensureMetadataExists,
+  emptyStyle,
 }

src/stylestore.js

@@ -9,13 +9,6 @@ const storageKeys = {
   accessToken: [storagePrefix, 'access_token'].join(':')
 }
 
-// Empty style is always used if no style could be restored or fetched
-const emptyStyle = style.ensureMetadataExists(style.fromJSON({
-		version: 8,
-		sources: {},
-		layers: [],
-}))
-
 const defaultStyleUrl = "https://raw.githubusercontent.com/osm2vectortiles/mapbox-gl-styles/master/styles/basic-v9-cdn.json"
 // Fetch a default style via URL and return it or a fallback style via callback
 export function loadDefaultStyle(cb) {
@@ -27,13 +20,13 @@ export function loadDefaultStyle(cb) {
     if (request.status >= 200 && request.status < 400) {
       cb(style.ensureMetadataExists(style.fromJSON(request.responseText)))
     } else {
-			cb(emptyStyle)
+      cb(style.emptyStyle)
     }
   }
 
   request.onerror = function() {
       console.log('Could not fetch default style')
-			cb(emptyStyle)
+      cb(style.emptyStyle)
   }
 
   request.send()
@@ -91,6 +84,10 @@ export class StyleStore {
     this.mapStyles = loadStoredStyles()
   }
 
+  supported(cb) {
+    cb(window.localStorage !== undefined)
+  }
+
   // Delete entire style history
   purge() {
     for (let i = 0; i < window.localStorage.length; i++) {
@@ -102,13 +99,13 @@ export class StyleStore {
   }
 
   // Find the last edited style
-	latestStyle() {
+  latestStyle(cb) {
-		if(this.mapStyles.length === 0) return emptyStyle
+    if(this.mapStyles.length === 0) return cb(style.emptyStyle)
     const styleId = window.localStorage.getItem(storageKeys.latest)
     const styleItem = window.localStorage.getItem(styleKey(styleId))
 
-		if(styleItem) return style.fromJSON(styleItem)
+    if(styleItem) return cb(style.fromJSON(styleItem))
-		return emptyStyle
+    cb(style.emptyStyle)
   }
 
   // Save current style replacing previous version