Remove "PhabricatorEventType::TYPE_DIFFUSION_LOOKUPUSER" event

Summary: Ref T13444. This is an ancient event and part of the old event system. It is not likely to be in use anymore, and repository identities should generally replace it nowadays anyway.

Test Plan: Grepped for constant and related methods, no longer found any hits.

Maniphest Tasks: T13444

Differential Revision: https://secure.phabricator.com/D20909

src/applications/diffusion/query/DiffusionResolveUserQuery.php

···
 final class DiffusionResolveUserQuery extends Phobject {
 
   private $name;
-  private $commit;
 
   public function withName($name) {
     $this->name = $name;
     return $this;
   }
 
-  public function withCommit($commit) {
-    $this->commit = $commit;
-    return $this;
-  }
-
   public function execute() {
-    $user_name = $this->name;
-
-    $phid = $this->findUserPHID($this->name);
-    $phid = $this->fireLookupEvent($phid);
-
-    return $phid;
+    return $this->findUserPHID($this->name);
   }
 
   private function findUserPHID($user_name) {
···
   }
 
 
-  /**
-   * Emit an event so installs can do custom lookup of commit authors who may
-   * not be naturally resolvable.
-   */
-  private function fireLookupEvent($guess) {
-
-    $type = PhabricatorEventType::TYPE_DIFFUSION_LOOKUPUSER;
-    $data = array(
-      'commit'  => $this->commit,
-      'query'   => $this->name,
-      'result'  => $guess,
-    );
-
-    $event = new PhabricatorEvent($type, $data);
-    PhutilEventEngine::dispatchEvent($event);
-
-    return $event->getValue('result');
-  }
-
-
   private function findUserByUserName($user_name) {
     $by_username = id(new PhabricatorUser())->loadOneWhere(
       'userName = %s',
       $user_name);
+
     if ($by_username) {
       return $by_username->getPHID();
     }
+
     return null;
   }
 
···
     $by_realname = id(new PhabricatorUser())->loadAllWhere(
       'realName = %s',
       $real_name);
+
     if (count($by_realname) == 1) {
-      return reset($by_realname)->getPHID();
+      return head($by_realname)->getPHID();
     }
+
     return null;
   }
 
 
   private function findUserByEmailAddress($email_address) {
     $by_email = PhabricatorUser::loadOneWithEmailAddress($email_address);
+
     if ($by_email) {
       return $by_email->getPHID();
     }
+
     return null;
   }
 

src/applications/repository/management/PhabricatorRepositoryManagementLookupUsersWorkflow.php

···
 
   private function resolveUser(PhabricatorRepositoryCommit $commit, $name) {
     $phid = id(new DiffusionResolveUserQuery())
-      ->withCommit($commit)
       ->withName($name)
       ->execute();
 

src/applications/repository/management/PhabricatorRepositoryManagementRebuildIdentitiesWorkflow.php

···
     if (empty($seen[$identity_key])) {
       try {
         $user_phid = id(new DiffusionResolveUserQuery())
-          ->withCommit($commit)
           ->withName($identity_name)
           ->execute();
 

src/applications/repository/worker/commitmessageparser/PhabricatorRepositoryCommitMessageParserWorker.php

···
     $user_name) {
 
     return id(new DiffusionResolveUserQuery())
-      ->withCommit($commit)
       ->withName($user_name)
       ->execute();
   }

src/docs/user/userguide/events.diviner

···
   - `repository` The @{class:PhabricatorRepository} the commit was discovered
     in.
 
-== Diffusion: Lookup User ==
-
-The constant for this event is
-`PhabricatorEventType::TYPE_DIFFUSION_LOOKUPUSER`.
-
-This event is dispatched when the daemons are trying to link a commit to a
-Phabricator user account. You can listen for it to improve the accuracy of
-associating users with their commits.
-
-By default, Phabricator will try to find matches based on usernames, real names,
-or email addresses, but this can result in incorrect matches (e.g., if you have
-several employees with the same name) or failures to match (e.g., if someone
-changed their email address). Listening for this event allows you to intercept
-the lookup and supplement the results from another datasource.
-
-Data available on this event:
-
-  - `commit` The @{class:PhabricatorRepositoryCommit} that data is being looked
-    up for.
-  - `query` The author or committer string being looked up. This will usually
-    be something like "Abraham Lincoln <[e-mail]>", but
-    comes from the commit metadata so it may not be well-formatted.
-  - `result` The current result from the lookup (Phabricator's best guess at
-    the user PHID of the user named in the "query"). To substitute the result
-    with a different result, replace this with the correct PHID in your event
-    listener.
-
-Using @{class@libphutil:PhutilEmailAddress} may be helpful in parsing the query.
-
 == Test: Did Run Test ==
 
 The constant for this event is

src/infrastructure/events/constant/PhabricatorEventType.php

···
   const TYPE_DIFFERENTIAL_WILLMARKGENERATED = 'differential.willMarkGenerated';
 
   const TYPE_DIFFUSION_DIDDISCOVERCOMMIT    = 'diffusion.didDiscoverCommit';
-  const TYPE_DIFFUSION_LOOKUPUSER           = 'diffusion.lookupUser';
 
   const TYPE_TEST_DIDRUNTEST                = 'test.didRunTest';