In "External Accounts", replace hard-to-find tiny "link" icon with a nice button with text on it

Summary:
Ref T6703. Replaces the small "link" icon with a more obvious "Link External Account" button.

Moves us toward operating against `$config` objects instead of against `$provider` objects, which is more modern and will some day allow us to resolve T6703.

Test Plan: Viewed page, saw a more obvious button. Linked an external account.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T6703

Differential Revision: https://secure.phabricator.com/D20105

src/applications/auth/storage/PhabricatorAuthProviderConfig.php

@@ -95,6 +95,15 @@ final class PhabricatorAuthProviderConfig
     return $this->getProvider()->getProviderName();
   }
 
+  public function getSortVector() {
+    return id(new PhutilSortVector())
+      ->addString($this->getDisplayName());
+  }
+
+  public function newIconView() {
+    return $this->getProvider()->newIconView();
+  }
+
 
 /* -(  PhabricatorApplicationTransactionInterface  )------------------------- */
 

src/applications/settings/panel/PhabricatorExternalAccountsSettingsPanel.php

@@ -105,26 +105,39 @@ final class PhabricatorExternalAccountsSettingsPanel
 
     $accounts = mpull($accounts, null, 'getProviderKey');
 
-    $providers = PhabricatorAuthProvider::getAllEnabledProviders();
-    $providers = msort($providers, 'getProviderName');
-    foreach ($providers as $key => $provider) {
-      if (isset($accounts[$key])) {
-        continue;
-      }
+    $configs = id(new PhabricatorAuthProviderConfigQuery())
+      ->setViewer($viewer)
+      ->withIsEnabled(true)
+      ->execute();
+    $configs = msort($configs, 'getSortVector');
+
+    foreach ($configs as $config) {
+      $provider = $config->getProvider();
 
       if (!$provider->shouldAllowAccountLink()) {
         continue;
       }
 
+      // Don't show the user providers they already have linked.
+      $provider_key = $config->getProvider()->getProviderKey();
+      if (isset($accounts[$provider_key])) {
+        continue;
+      }
+
       $link_uri = '/auth/link/'.$provider->getProviderKey().'/';
 
-      $item = id(new PHUIObjectItemView())
-        ->setHeader($provider->getProviderName())
+      $link_button = id(new PHUIButtonView())
+        ->setTag('a')
+        ->setIcon('fa-link')
         ->setHref($link_uri)
-        ->addAction(
-          id(new PHUIListItemView())
-            ->setIcon('fa-link')
-            ->setHref($link_uri));
+        ->setColor(PHUIButtonView::GREY)
+        ->setText(pht('Link External Account'));
+
+      $item = id(new PHUIObjectItemView())
+        ->setHeader($config->getDisplayName())
+        ->setHref($link_uri)
+        ->setImageIcon($config->newIconView())
+        ->setSideColumn($link_button);
 
       $linkable->addItem($item);
     }