Rough skeleton of a "Query" dashboard panel

Summary: Ref T4986. This isn't pretty/usable yet (I need to move rendering out of ListController classes and into SearchEngine classes, I think) but does pull the correct results.

Test Plan: {F151537}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T4986

Differential Revision: https://secure.phabricator.com/D9007

src/__phutil_library_map__.php

@@ -1463,6 +1463,7 @@ phutil_register_library_map(array(
     'PhabricatorDashboardPanelTransactionEditor' => 'applications/dashboard/editor/PhabricatorDashboardPanelTransactionEditor.php',
     'PhabricatorDashboardPanelTransactionQuery' => 'applications/dashboard/query/PhabricatorDashboardPanelTransactionQuery.php',
     'PhabricatorDashboardPanelType' => 'applications/dashboard/paneltype/PhabricatorDashboardPanelType.php',
+    'PhabricatorDashboardPanelTypeQuery' => 'applications/dashboard/paneltype/PhabricatorDashboardPanelTypeQuery.php',
     'PhabricatorDashboardPanelTypeText' => 'applications/dashboard/paneltype/PhabricatorDashboardPanelTypeText.php',
     'PhabricatorDashboardPanelViewController' => 'applications/dashboard/controller/PhabricatorDashboardPanelViewController.php',
     'PhabricatorDashboardQuery' => 'applications/dashboard/query/PhabricatorDashboardQuery.php',
@@ -4306,6 +4307,7 @@ phutil_register_library_map(array(
     'PhabricatorDashboardPanelTransactionEditor' => 'PhabricatorApplicationTransactionEditor',
     'PhabricatorDashboardPanelTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
     'PhabricatorDashboardPanelType' => 'Phobject',
+    'PhabricatorDashboardPanelTypeQuery' => 'PhabricatorDashboardPanelType',
     'PhabricatorDashboardPanelTypeText' => 'PhabricatorDashboardPanelType',
     'PhabricatorDashboardPanelViewController' => 'PhabricatorDashboardController',
     'PhabricatorDashboardQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',

src/applications/dashboard/engine/PhabricatorDashboardPanelRenderingEngine.php

@@ -50,8 +50,16 @@ final class PhabricatorDashboardPanelRenderingEngine extends Phobject {
       }
     }
 
-
-    return $panel_type->renderPanel($viewer, $panel);
+    try {
+      return $panel_type->renderPanel($viewer, $panel);
+    } catch (Exception $ex) {
+      return $this->renderErrorPanel(
+        $panel->getName(),
+        pht(
+          '%s: %s',
+          phutil_tag('strong', array(), get_class($ex)),
+          $ex->getMessage()));
+    }
   }
 
   private function renderErrorPanel($title, $body) {

src/applications/dashboard/paneltype/PhabricatorDashboardPanelTypeQuery.php

@@ -0,0 +1,82 @@
+<?php
+
+final class PhabricatorDashboardPanelTypeQuery
+  extends PhabricatorDashboardPanelType {
+
+  public function getPanelTypeKey() {
+    return 'query';
+  }
+
+  public function getPanelTypeName() {
+    return pht('Query Panel');
+  }
+
+  public function getPanelTypeDescription() {
+    return pht(
+      'Show results of a search query, like the most recently filed tasks or '.
+      'revisions you need to review.');
+  }
+
+  public function getFieldSpecifications() {
+    return array(
+      'class' => array(
+        'name' => pht('ApplicationSearch Class'),
+        'type' => 'text',
+      ),
+      'key' => array(
+        'name' => pht('ApplicationSearch Key'),
+        'type' => 'text',
+      ),
+    );
+  }
+
+  protected function renderPanelContent(
+    PhabricatorUser $viewer,
+    PhabricatorDashboardPanel $panel) {
+
+    $class = $panel->getProperty('class');
+
+    $engine = PhabricatorApplicationSearchEngine::getEngineByClassName($class);
+    if (!$engine) {
+      throw new Exception(
+        pht(
+          'The application search engine "%s" is not known to Phabricator!',
+          $class));
+    }
+
+    $engine->setViewer($viewer);
+
+    $key = $panel->getProperty('key');
+    if ($engine->isBuiltinQuery($key)) {
+      $saved = $engine->buildSavedQueryFromBuiltin($key);
+    } else {
+      $saved = id(new PhabricatorSavedQueryQuery())
+        ->setViewer($viewer)
+        ->withEngineClassNames(array($class))
+        ->withQueryKeys(array($key))
+        ->executeOne();
+    }
+
+    if (!$saved) {
+      throw new Exception(
+        pht(
+          'Query "%s" is unknown to application search engine "%s"!',
+          $key,
+          $class));
+    }
+
+    $query = $engine->buildQueryFromSavedQuery($saved);
+
+    $results = $query
+      ->setViewer($viewer)
+      ->execute();
+
+    $out = array();
+    foreach ($results as $result) {
+      $out[] = phutil_tag('div', array(), $result->getPHID());
+    }
+
+    return $out;
+  }
+
+}

src/applications/search/engine/PhabricatorApplicationSearchEngine.php

@@ -4,10 +4,11 @@
  * Represents an abstract search engine for an application. It supports
  * creating and storing saved queries.
  *
- * @task builtin  Builtin Queries
- * @task uri      Query URIs
- * @task dates    Date Filters
- * @task read     Reading Utilities
+ * @task construct  Constructing Engines
+ * @task builtin    Builtin Queries
+ * @task uri        Query URIs
+ * @task dates      Date Filters
+ * @task read       Reading Utilities
  *
  * @group search
  */
@@ -174,6 +175,36 @@ abstract class PhabricatorApplicationSearchEngine {
   }
 
 
+/* -(  Constructing Engines  )----------------------------------------------- */
+
+
+  /**
+   * Load all available application search engines.
+   *
+   * @return list<PhabricatorApplicationSearchEngine> All available engines.
+   * @task construct
+   */
+  public static function getAllEngines() {
+    $engines = id(new PhutilSymbolLoader())
+      ->setAncestorClass(__CLASS__)
+      ->loadObjects();
+
+    return $engines;
+  }
+
+
+  /**
+   * Get an engine by class name, if it exists.
+   *
+   * @return PhabricatorApplicationSearchEngine|null Engine, or null if it does
+   *   not exist.
+   * @task construct
+   */
+  public static function getEngineByClassName($class_name) {
+    return idx(self::getAllEngines(), $class_name);
+  }
+
+
 /* -(  Builtin Queries  )---------------------------------------------------- */
 
 

src/applications/search/query/PhabricatorSavedQueryQuery.php

@@ -40,21 +40,21 @@ final class PhabricatorSavedQueryQuery
   private function buildWhereClause($conn_r) {
     $where = array();
 
-    if ($this->ids) {
+    if ($this->ids !== null) {
       $where[] = qsprintf(
         $conn_r,
         'id IN (%Ld)',
         $this->ids);
     }
 
-    if ($this->engineClassNames) {
+    if ($this->engineClassNames !== null) {
       $where[] = qsprintf(
         $conn_r,
         'engineClassName IN (%Ls)',
         $this->engineClassNames);
     }
 
-    if ($this->queryKeys) {
+    if ($this->queryKeys !== null) {
       $where[] = qsprintf(
         $conn_r,
         'queryKey IN (%Ls)',