Conpherence - add support for users with no conpherences in durable column view

Summary: Ref T7014. This just makes it so there's almost no UI and a simple "You have no messages. <button>Send a message.</button>" UI

Test Plan: hacked the code such that should_404 and conpherence were false and null respectively. verified i got the right ui in the durable column. verified send a message button worked, ending up with me in main conpherence view on the right message

Reviewers: chad, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7014

Differential Revision: https://secure.phabricator.com/D12042

src/applications/conpherence/controller/ConpherenceColumnViewController.php

@@ -25,6 +25,7 @@ final class ConpherenceColumnViewController extends
     }
 
     $conpherence = null;
+    $should_404 = false;
     if ($request->getInt('id')) {
       $conpherence = id(new ConpherenceThreadQuery())
         ->setViewer($user)
@@ -32,6 +33,7 @@ final class ConpherenceColumnViewController extends
         ->needTransactions(true)
         ->setTransactionLimit(ConpherenceThreadQuery::TRANSACTION_LIMIT)
         ->executeOne();
+      $should_404 = true;
     } else if ($latest_participant) {
       $participant = head($latest_participant);
       $conpherence = id(new ConpherenceThreadQuery())
@@ -40,31 +42,44 @@ final class ConpherenceColumnViewController extends
         ->needTransactions(true)
         ->setTransactionLimit(ConpherenceThreadQuery::TRANSACTION_LIMIT)
         ->executeOne();
+      $should_404 = true;
     }
 
-    if (!$conpherence) {
-      return new Aphront404Response();
-    }
-    $this->setConpherence($conpherence);
-
-    $participant = $conpherence->getParticipant($user->getPHID());
-    $transactions = $conpherence->getTransactions();
-    $latest_transaction = head($transactions);
-    $write_guard = AphrontWriteGuard::beginScopedUnguardedWrites();
-    $participant->markUpToDate($conpherence, $latest_transaction);
-    unset($write_guard);
-
     $durable_column = id(new ConpherenceDurableColumnView())
       ->setUser($user)
-      ->setSelectedConpherence($conpherence)
-      ->setConpherences($latest_conpherences)
-      ->setStyle(null);
+      ->setVisible(true);
+    if (!$conpherence) {
+      if ($should_404) {
+        return new Aphront404Response();
+      }
+
+      $conpherence_id = null;
+      $conpherence_phid = null;
+      $latest_transaction_id = null;
+
+    } else {
+      $this->setConpherence($conpherence);
+
+      $participant = $conpherence->getParticipant($user->getPHID());
+      $transactions = $conpherence->getTransactions();
+      $latest_transaction = head($transactions);
+      $write_guard = AphrontWriteGuard::beginScopedUnguardedWrites();
+      $participant->markUpToDate($conpherence, $latest_transaction);
+      unset($write_guard);
+
+      $durable_column
+        ->setSelectedConpherence($conpherence)
+        ->setConpherences($latest_conpherences);
+      $conpherence_id = $conpherence->getID();
+      $conpherence_phid = $conpherence->getPHID();
+      $latest_transaction_id = $latest_transaction->getID();
+    }
 
     $response = array(
       'content' => hsprintf('%s', $durable_column),
-      'threadID' => $conpherence->getID(),
-      'threadPHID' => $conpherence->getPHID(),
-      'latestTransactionID' => $latest_transaction->getID(),);
+      'threadID' => $conpherence_id,
+      'threadPHID' => $conpherence_phid,
+      'latestTransactionID' => $latest_transaction_id,);
 
     return id(new AphrontAjaxResponse())->setContent($response);
   }

src/applications/conpherence/view/ConpherenceDurableColumnView.php

@@ -193,7 +193,7 @@ final class ConpherenceDurableColumnView extends AphrontTagView {
 
     if (!$conpherence) {
 
-      $title = pht('Loading...');
+      $title = null;
       $settings_button = null;
       $settings_menu = null;
 
@@ -306,7 +306,24 @@ final class ConpherenceDurableColumnView extends AphrontTagView {
   private function buildTransactions() {
     $conpherence = $this->getSelectedConpherence();
     if (!$conpherence) {
-      return pht('Loading...');
+      if (!$this->getVisible()) {
+        return pht('Loading...');
+      }
+      return array(
+        phutil_tag(
+          'div',
+          array(
+            'class' => 'mmb',
+          ),
+          pht('You do not have any messages yet.')),
+        javelin_tag(
+          'a',
+          array(
+            'href' => '/conpherence/new/',
+            'class' => 'button grey',
+            'sigil' => 'workflow',
+          ),
+          pht('Send a Message')),);
     }
 
     $data = ConpherenceTransactionView::renderTransactions(
@@ -322,6 +339,10 @@ final class ConpherenceDurableColumnView extends AphrontTagView {
 
   private function buildTextInput() {
     $conpherence = $this->getSelectedConpherence();
+    if (!$conpherence) {
+      return null;
+    }
+
     $textarea = javelin_tag(
       'textarea',
       array(
@@ -330,10 +351,6 @@ final class ConpherenceDurableColumnView extends AphrontTagView {
         'sigil' => 'conpherence-durable-column-textarea',
         'placeholder' => pht('Send a message...'),
       ));
-    if (!$conpherence) {
-      return $textarea;
-    }
-
     $id = $conpherence->getID();
     return phabricator_form(
       $this->getUser(),
@@ -358,6 +375,11 @@ final class ConpherenceDurableColumnView extends AphrontTagView {
   }
 
   private function buildSendButton() {
+    $conpherence = $this->getSelectedConpherence();
+    if (!$conpherence) {
+      return null;
+    }
+
     return javelin_tag(
       'button',
       array(