Inform about disabled and away users in Differential fields

Summary:
I've tried colors, italics, strike-through and this is a compromise between me and @leebyron.

NOTE: I don't want to disturb @epriestley from playing Diablo 3.

Test Plan: {F11439, size=full}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran, epriestley, leebyron

Differential Revision: https://secure.phabricator.com/D2481

src/applications/differential/field/specification/author/DifferentialAuthorFieldSpecification.php

@@ -32,10 +32,7 @@ final class DifferentialAuthorFieldSpecification
   }
 
   public function renderValueForRevisionView() {
-    $author_phid = $this->getAuthorPHID();
-    $handle = $this->getHandle($author_phid);
-
-    return $handle->renderLink();
+    return $this->renderUserList(array($this->getAuthorPHID()));
   }
 
   private function getAuthorPHID() {

src/applications/differential/field/specification/base/DifferentialFieldSpecification.php

@@ -265,6 +265,45 @@ abstract class DifferentialFieldSpecification {
   }
 
 
+  /**
+   * Load users, their current statuses and return a markup with links to the
+   * user profiles and information about their current status.
+   *
+   * @return string Display markup.
+   * @task view
+   */
+  public function renderUserList(array $user_phids) {
+    if (!$user_phids) {
+      return '<em>None</em>';
+    }
+
+    $statuses = id(new PhabricatorUserStatus())->loadAllWhere(
+      'userPHID IN (%Ls) AND UNIX_TIMESTAMP() BETWEEN dateFrom AND dateTo',
+      $user_phids);
+    $statuses = mpull($statuses, null, 'getUserPHID');
+
+    $links = array();
+    foreach ($user_phids as $user_phid) {
+      $handle = $this->getHandle($user_phid);
+      $extra = null;
+      $status = idx($statuses, $handle->getPHID());
+      if ($handle->isDisabled()) {
+        $extra = ' <strong>(disabled)</strong>';
+      } else if ($status) {
+        $until = phabricator_date($status->getDateTo(), $this->getUser());
+        if ($status->getStatus() == PhabricatorUserStatus::STATUS_SPORADIC) {
+          $extra = ' <strong title="until '.$until.'">(sporadic)</strong>';
+        } else {
+          $extra = ' <strong title="until '.$until.'">(away)</strong>';
+        }
+      }
+      $links[] = $handle->renderLink().$extra;
+    }
+
+    return implode(', ', $links);
+  }
+
+
   /**
    * Return a markup block representing a warning to display with the comment
    * box when preparing to accept a diff. A return value of null indicates no

src/applications/differential/field/specification/base/__init__.php

@@ -11,6 +11,8 @@ phutil_require_module('phabricator', 'applications/differential/field/exception/
 phutil_require_module('phabricator', 'applications/differential/field/exception/parse');
 phutil_require_module('phabricator', 'applications/metamta/storage/mailinglist');
 phutil_require_module('phabricator', 'applications/people/storage/user');
+phutil_require_module('phabricator', 'applications/people/storage/userstatus');
+phutil_require_module('phabricator', 'view/utils');
 
 phutil_require_module('phutil', 'utils');
 

src/applications/differential/field/specification/ccs/DifferentialCCsFieldSpecification.php

@@ -34,17 +34,7 @@ final class DifferentialCCsFieldSpecification
   }
 
   public function renderValueForRevisionView() {
-    $cc_phids = $this->getCCPHIDs();
-    if (!$cc_phids) {
-      return '<em>None</em>';
-    }
-
-    $links = array();
-    foreach ($cc_phids as $cc_phid) {
-      $links[] = $this->getHandle($cc_phid)->renderLink();
-    }
-
-    return implode(', ', $links);
+    return $this->renderUserList($this->getCCPHIDs());
   }
 
   private function getCCPHIDs() {

src/applications/differential/field/specification/reviewers/DifferentialReviewersFieldSpecification.php

@@ -35,17 +35,7 @@ final class DifferentialReviewersFieldSpecification
   }
 
   public function renderValueForRevisionView() {
-    $reviewer_phids = $this->getReviewerPHIDs();
-    if (!$reviewer_phids) {
-      return '<em>None</em>';
-    }
-
-    $links = array();
-    foreach ($reviewer_phids as $reviewer_phid) {
-      $links[] = $this->getHandle($reviewer_phid)->renderLink();
-    }
-
-    return implode(', ', $links);
+    return $this->renderUserList($this->getReviewerPHIDs());
   }
 
   private function getReviewerPHIDs() {