[chrome] Implement app-level lastPath

We have always tracked the lastPath for tabs on the page, which means that clicking from one to the other restores your previous state. Now we are tracking the lastUrls for each app and using them in the appSwitcher so that the appSwitcher properly links to the last state of each app.

src/ui/public/chrome/Tab.js

@@ -1,4 +1,5 @@
 var _ = require('lodash');
+var reEsc = require('lodash').escapeRegExp;
 var storage = window.sessionStorage;
 
 function Tab(spec) {
@@ -8,6 +9,7 @@ function Tab(spec) {
   this.resetWhenActive = !!spec.resetWhenActive;
   this.lastUrlStoreKey = spec.trackLastPath ? 'lastUrl:' + this.id : null;
   this.rootUrl = '/' + this.id;
+  this.rootRegExp = new RegExp(`^${reEsc(this.rootUrl)}(/|$|\\?)`);
   this.lastUrl = this.lastUrlStoreKey && storage.getItem(this.lastUrlStoreKey);
 
   this.activeIndicatorColor = spec.activeIndicatorColor || null;

src/ui/public/chrome/TabCollection.js

@@ -1,7 +1,10 @@
 var _ = require('lodash');
+var { startsWith } = require('lodash');
 var Tab = require('ui/chrome/Tab');
-var format = require('url').format;
-var parse = _.wrap(require('url').parse, function (parse, path) {
+var { format, parse } = require('url');
+var storage = window.sessionStorage;
+
+parse = _.wrap(parse, function (parse, path) {
   var parsed = parse(path, true);
   return {
     pathname: parsed.pathname,
@@ -42,19 +45,23 @@ function TabCollection() {
     return activeTab;
   };
 
-  this.consumeRouteUpdate = function ($location, persist) {
-    var url = parse($location.url(), true);
-    var id = $location.path().split('/')[1] || '';
+  this.consumeRouteUpdate = function (appId, href, path, persist) {
+    var url = parse(href, true);
 
     tabs.forEach(function (tab) {
-      var active = tab.active = (tab.id === id);
-      var lastUrl = active ? url : parse(tab.lastUrl || tab.rootUrl);
+      tab.active = tab.rootRegExp.test(path);
+
+      var lastUrl = tab.active ? url : parse(tab.lastUrl || tab.rootUrl);
       lastUrl.query._g = url.query._g;
 
       if (tab.active) activeTab = tab;
       if (persist) {
         tab.persistLastUrl(format(lastUrl));
       }
+
+      if (tab.active) {
+        storage.setItem(`appLastUrl:${appId}`, href);
+      }
     });
   };
 }

src/ui/public/chrome/api/angular.js

@@ -44,7 +44,15 @@ module.exports = function (chrome, internals) {
           chrome.setVisible(!Boolean($location.search().embed));
 
           // listen for route changes, propogate to tabs
-          var onRouteChange = _.bindKey(internals.tabs, 'consumeRouteUpdate', $location, chrome.getVisible());
+          var onRouteChange = function () {
+            internals.tabs.consumeRouteUpdate(
+              chrome.getAppId(),
+              window.location.href,
+              $location.url(),
+              chrome.getVisible()
+            );
+          };
+
           $rootScope.$on('$routeChangeSuccess', onRouteChange);
           $rootScope.$on('$routeUpdate', onRouteChange);
           onRouteChange();