Remove "custom" home page input

Also add an API to let extensions define additional default route
options.

Allowing default routes with parameters (e.g. /d/123) is very difficult
because of the way Mithril routing works, and it doesn't have a
convincing use-case to justify the trouble. So I've removed the custom
input altogether.

closes #427

js/admin/src/components/BasicsPage.js

@@ -4,6 +4,7 @@ import Select from 'flarum/components/Select';
 import Button from 'flarum/components/Button';
 import Alert from 'flarum/components/Alert';
 import saveConfig from 'flarum/utils/saveConfig';
+import ItemList from 'flarum/utils/ItemList';
 
 export default class BasicsPage extends Component {
   constructor(...args) {
@@ -72,18 +73,12 @@ export default class BasicsPage extends Component {
                 <div className="helpText">
                   Choose the page which users will first see when they visit your forum. If entering a custom value, use the path relative to the forum root.
                 </div>,
-                <label className="checkbox">
-                  <input type="radio" name="homePage" value="/all" checked={this.values.default_route() === '/all'} onclick={m.withAttr('value', this.values.default_route)}/>
-                  All Discussions
-                </label>,
-                <label className="checkbox">
-                  <input type="radio" name="homePage" value="custom" checked={this.values.default_route() !== '/all'} onclick={() => {
-                    this.values.default_route('');
-                    m.redraw(true);
-                    this.$('.BasicsPage-homePage input').select();
-                  }}/>
-                  Custom <input className="FormControl" value={this.values.default_route()} oninput={m.withAttr('value', this.values.default_route)} style={this.values.default_route() !== '/all' ? 'margin-top: 5px' : 'display:none'}/>
-                </label>
+                this.homePageItems().toArray().map(({path, label}) =>
+                  <label className="checkbox">
+                    <input type="radio" name="homePage" value={path} checked={this.values.default_route() === path} onclick={m.withAttr('value', this.values.default_route)}/>
+                    {label}
+                  </label>
+                )
               ]
             })}
 
@@ -120,6 +115,24 @@ export default class BasicsPage extends Component {
     return this.fields.some(key => this.values[key]() !== config[key]);
   }
 
+  /**
+   * Build a list of options for the default homepage. Each option must be an
+   * object with `path` and `label` properties.
+   *
+   * @return {ItemList}
+   * @public
+   */
+  homePageItems()  {
+    const items = new ItemList();
+
+    items.add('allDiscussions', {
+      path: '/all',
+      label: 'All Discussions'
+    });
+
+    return items;
+  }
+
   onsubmit(e) {
     e.preventDefault();
 

js/forum/src/initializers/boot.js

@@ -24,14 +24,15 @@ export default function boot(app) {
   // able to click on the 'back' button to go home, regardless of which page
   // they started on.
   const defaultRoute = app.forum.attribute('defaultRoute');
+  let defaultAction = 'index';
 
   for (const i in app.routes) {
-    if (app.routes[i].path === defaultRoute) {
-      app.routes[i].path = '/';
-      app.history.push(i, '/');
-    }
+    if (app.routes[i].path === defaultRoute) defaultAction = i;
   }
 
+  app.routes[defaultAction].path = '/';
+  app.history.push(defaultAction, '/');
+
   m.startComputation();
 
   m.mount(document.getElementById('app-navigation'), Navigation.component({className: 'App-backControl', drawer: true}));

src/Forum/ForumServiceProvider.php

@@ -63,7 +63,7 @@ class ForumServiceProvider extends ServiceProvider
         $routes->get(
             '/all',
             'flarum.forum.index',
-            $this->action('Flarum\Forum\Actions\IndexAction')
+            $defaultAction = $this->action('Flarum\Forum\Actions\IndexAction')
         );
 
         $routes->get(
@@ -129,11 +129,16 @@ class ForumServiceProvider extends ServiceProvider
         event(new RegisterForumRoutes($routes));
 
         $settings = $this->app->make('Flarum\Core\Settings\SettingsRepository');
+        $defaultRoute = $settings->get('default_route');
+
+        if (isset($routes->getRouteData()[0]['GET'][$defaultRoute])) {
+            $defaultAction = $routes->getRouteData()[0]['GET'][$defaultRoute];
+        }
 
         $routes->get(
             '/',
             'flarum.forum.default',
-            $routes->getRouteData()[0]['GET'][$settings->get('default_route')]
+            $defaultAction
         );
     }