Put subprojects and milestones back into the Project UI

Summary: Ref T10010. Restores subprojects and milestones to the UI with a more modern style and more warnings.

Test Plan:
{F1085207}

{F1085208}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10010

Differential Revision: https://secure.phabricator.com/D15152

src/__phutil_library_map__.php

@@ -2913,7 +2913,6 @@ phutil_register_library_map(array(
     'PhabricatorProjectMembersProfilePanel' => 'applications/project/profilepanel/PhabricatorProjectMembersProfilePanel.php',
     'PhabricatorProjectMembersRemoveController' => 'applications/project/controller/PhabricatorProjectMembersRemoveController.php',
     'PhabricatorProjectMembersViewController' => 'applications/project/controller/PhabricatorProjectMembersViewController.php',
-    'PhabricatorProjectMilestonesController' => 'applications/project/controller/PhabricatorProjectMilestonesController.php',
     'PhabricatorProjectMoveController' => 'applications/project/controller/PhabricatorProjectMoveController.php',
     'PhabricatorProjectNameContextFreeGrammar' => 'applications/project/lipsum/PhabricatorProjectNameContextFreeGrammar.php',
     'PhabricatorProjectNoProjectsDatasource' => 'applications/project/typeahead/PhabricatorProjectNoProjectsDatasource.php',
@@ -2937,7 +2936,9 @@ phutil_register_library_map(array(
     'PhabricatorProjectSlug' => 'applications/project/storage/PhabricatorProjectSlug.php',
     'PhabricatorProjectStandardCustomField' => 'applications/project/customfield/PhabricatorProjectStandardCustomField.php',
     'PhabricatorProjectStatus' => 'applications/project/constants/PhabricatorProjectStatus.php',
+    'PhabricatorProjectSubprojectWarningController' => 'applications/project/controller/PhabricatorProjectSubprojectWarningController.php',
     'PhabricatorProjectSubprojectsController' => 'applications/project/controller/PhabricatorProjectSubprojectsController.php',
+    'PhabricatorProjectSubprojectsProfilePanel' => 'applications/project/profilepanel/PhabricatorProjectSubprojectsProfilePanel.php',
     'PhabricatorProjectTestDataGenerator' => 'applications/project/lipsum/PhabricatorProjectTestDataGenerator.php',
     'PhabricatorProjectTransaction' => 'applications/project/storage/PhabricatorProjectTransaction.php',
     'PhabricatorProjectTransactionEditor' => 'applications/project/editor/PhabricatorProjectTransactionEditor.php',
@@ -7330,7 +7331,6 @@ phutil_register_library_map(array(
     'PhabricatorProjectMembersProfilePanel' => 'PhabricatorProfilePanel',
     'PhabricatorProjectMembersRemoveController' => 'PhabricatorProjectController',
     'PhabricatorProjectMembersViewController' => 'PhabricatorProjectController',
-    'PhabricatorProjectMilestonesController' => 'PhabricatorProjectController',
     'PhabricatorProjectMoveController' => 'PhabricatorProjectController',
     'PhabricatorProjectNameContextFreeGrammar' => 'PhutilContextFreeGrammar',
     'PhabricatorProjectNoProjectsDatasource' => 'PhabricatorTypeaheadDatasource',
@@ -7357,7 +7357,9 @@ phutil_register_library_map(array(
       'PhabricatorStandardCustomFieldInterface',
     ),
     'PhabricatorProjectStatus' => 'Phobject',
+    'PhabricatorProjectSubprojectWarningController' => 'PhabricatorProjectController',
     'PhabricatorProjectSubprojectsController' => 'PhabricatorProjectController',
+    'PhabricatorProjectSubprojectsProfilePanel' => 'PhabricatorProfilePanel',
     'PhabricatorProjectTestDataGenerator' => 'PhabricatorTestDataGenerator',
     'PhabricatorProjectTransaction' => 'PhabricatorApplicationTransaction',
     'PhabricatorProjectTransactionEditor' => 'PhabricatorApplicationTransactionEditor',

src/applications/project/application/PhabricatorProjectApplication.php

@@ -91,6 +91,8 @@ final class PhabricatorProjectApplication extends PhabricatorApplication {
           => 'PhabricatorProjectWatchController',
         'silence/(?P<id>[1-9]\d*)/'
           => 'PhabricatorProjectSilenceController',
+        'warning/(?P<id>[1-9]\d*)/'
+          => 'PhabricatorProjectSubprojectWarningController',
       ),
       '/tag/' => array(
         '(?P<slug>[^/]+)/' => 'PhabricatorProjectViewController',

src/applications/project/controller/PhabricatorProjectEditController.php

@@ -42,6 +42,7 @@ final class PhabricatorProjectEditController
       if ($parent_id) {
         $query = id(new PhabricatorProjectQuery())
           ->setViewer($viewer)
+          ->needImages(true)
           ->requireCapabilities(
             array(
               PhabricatorPolicyCapability::CAN_VIEW,
@@ -58,7 +59,7 @@ final class PhabricatorProjectEditController
 
         if ($is_milestone) {
           if (!$parent->supportsMilestones()) {
-            $cancel_uri = "/project/milestones/{$parent_id}/";
+            $cancel_uri = "/project/subprojects/{$parent_id}/";
             return $this->newDialog()
               ->setTitle(pht('No Milestones'))
               ->appendParagraph(
@@ -91,20 +92,13 @@ final class PhabricatorProjectEditController
     $engine = $this->getEngine();
     if ($engine) {
       $parent = $engine->getParentProject();
-      if ($parent) {
-        $id = $parent->getID();
+      $milestone = $engine->getMilestoneProject();
+      if ($parent || $milestone) {
+        $id = nonempty($parent, $milestone)->getID();
         $crumbs->addTextCrumb(
           pht('Subprojects'),
           $this->getApplicationURI("subprojects/{$id}/"));
       }
-
-      $milestone = $engine->getMilestoneProject();
-      if ($milestone) {
-        $id = $milestone->getID();
-        $crumbs->addTextCrumb(
-          pht('Milestones'),
-          $this->getApplicationURI("milestones/{$id}/"));
-      }
     }
 
     return $crumbs;

src/applications/project/controller/PhabricatorProjectMilestonesController.php

@@ -1,92 +0,0 @@
-<?php
-
-final class PhabricatorProjectMilestonesController
-  extends PhabricatorProjectController {
-
-  public function shouldAllowPublic() {
-    return true;
-  }
-
-  public function handleRequest(AphrontRequest $request) {
-    $viewer = $request->getViewer();
-
-    $response = $this->loadProject();
-    if ($response) {
-      return $response;
-    }
-
-    $project = $this->getProject();
-    $id = $project->getID();
-
-    $can_edit = PhabricatorPolicyFilter::hasCapability(
-      $viewer,
-      $project,
-      PhabricatorPolicyCapability::CAN_EDIT);
-
-    $has_support = $project->supportsMilestones();
-    if ($has_support) {
-      $milestones = id(new PhabricatorProjectQuery())
-        ->setViewer($viewer)
-        ->withParentProjectPHIDs(array($project->getPHID()))
-        ->needImages(true)
-        ->withIsMilestone(true)
-        ->setOrder('newest')
-        ->execute();
-    } else {
-      $milestones = array();
-    }
-
-    $can_create = $can_edit && $has_support;
-
-    if ($project->getHasMilestones()) {
-      $button_text = pht('Create Next Milestone');
-    } else {
-      $button_text = pht('Add Milestones');
-    }
-
-    $header = id(new PHUIHeaderView())
-      ->setHeader(pht('Milestones'))
-      ->addActionLink(
-        id(new PHUIButtonView())
-          ->setTag('a')
-          ->setHref("/project/edit/?milestone={$id}")
-          ->setIcon('fa-plus')
-          ->setDisabled(!$can_create)
-          ->setWorkflow(!$can_create)
-          ->setText($button_text));
-
-    $box = id(new PHUIObjectBoxView())
-      ->setHeader($header);
-
-    if (!$has_support) {
-      $no_support = pht(
-        'This project is a milestone. Milestones can not have their own '.
-        'milestones.');
-
-      $info_view = id(new PHUIInfoView())
-        ->setErrors(array($no_support))
-        ->setSeverity(PHUIInfoView::SEVERITY_WARNING);
-
-      $box->setInfoView($info_view);
-    }
-
-    $box->setObjectList(
-      id(new PhabricatorProjectListView())
-        ->setUser($viewer)
-        ->setProjects($milestones)
-        ->renderList());
-
-    $nav = $this->getProfileMenu();
-    $nav->selectFilter(PhabricatorProject::PANEL_MILESTONES);
-
-    $crumbs = $this->buildApplicationCrumbs();
-    $crumbs->addTextCrumb(pht('Milestones'));
-
-    return $this->newPage()
-      ->setNavigation($nav)
-      ->setCrumbs($crumbs)
-      ->setTitle(array($project->getName(), pht('Milestones')))
-      ->appendChild($box);
-  }
-
-}

src/applications/project/controller/PhabricatorProjectProfileController.php

@@ -45,6 +45,9 @@ final class PhabricatorProjectProfileController
     $watch_action = $this->renderWatchAction($project);
     $header->addActionLink($watch_action);
 
+    $milestone_list = $this->buildMilestoneList($project);
+    $subproject_list = $this->buildSubprojectList($project);
+
     $member_list = id(new PhabricatorProjectMemberListView())
       ->setUser($viewer)
       ->setProject($project)
@@ -82,6 +85,8 @@ final class PhabricatorProjectProfileController
         ))
       ->setSideColumn(
         array(
+          $milestone_list,
+          $subproject_list,
           $member_list,
           $watcher_list,
         ));
@@ -176,5 +181,90 @@ final class PhabricatorProjectProfileController
       ->setHref($watch_href);
   }
 
+  private function buildMilestoneList(PhabricatorProject $project) {
+    if (!$project->getHasMilestones()) {
+      return null;
+    }
+
+    $viewer = $this->getViewer();
+    $id = $project->getID();
+
+    $milestones = id(new PhabricatorProjectQuery())
+      ->setViewer($viewer)
+      ->withParentProjectPHIDs(array($project->getPHID()))
+      ->needImages(true)
+      ->withIsMilestone(true)
+      ->setOrder('newest')
+      ->execute();
+    if (!$milestones) {
+      return null;
+    }
+
+    $milestone_list = id(new PhabricatorProjectListView())
+      ->setUser($viewer)
+      ->setProjects($milestones)
+      ->renderList();
+
+    $view_all = id(new PHUIButtonView())
+      ->setTag('a')
+      ->setIcon(
+        id(new PHUIIconView())
+          ->setIcon('fa-list-ul'))
+      ->setText(pht('View All'))
+      ->setHref("/project/subprojects/{$id}/");
+
+    $header = id(new PHUIHeaderView())
+      ->setHeader(pht('Milestones'))
+      ->addActionLink($view_all);
+
+    return id(new PHUIObjectBoxView())
+      ->setHeader($header)
+      ->setBackground(PHUIBoxView::GREY)
+      ->setObjectList($milestone_list);
+  }
+
+  private function buildSubprojectList(PhabricatorProject $project) {
+    if (!$project->getHasSubprojects()) {
+      return null;
+    }
+
+    $viewer = $this->getViewer();
+    $id = $project->getID();
+
+    $limit = 25;
+
+    $subprojects = id(new PhabricatorProjectQuery())
+      ->setViewer($viewer)
+      ->withParentProjectPHIDs(array($project->getPHID()))
+      ->needImages(true)
+      ->withIsMilestone(false)
+      ->setLimit($limit)
+      ->execute();
+    if (!$subprojects) {
+      return null;
+    }
+
+    $subproject_list = id(new PhabricatorProjectListView())
+      ->setUser($viewer)
+      ->setProjects($subprojects)
+      ->renderList();
+
+    $view_all = id(new PHUIButtonView())
+      ->setTag('a')
+      ->setIcon(
+        id(new PHUIIconView())
+          ->setIcon('fa-list-ul'))
+      ->setText(pht('View All'))
+      ->setHref("/project/subprojects/{$id}/");
+
+    $header = id(new PHUIHeaderView())
+      ->setHeader(pht('Subprojects'))
+      ->addActionLink($view_all);
+
+    return id(new PHUIObjectBoxView())
+      ->setHeader($header)
+      ->setBackground(PHUIBoxView::GREY)
+      ->setObjectList($subproject_list);
+  }
 
 }

src/applications/project/controller/PhabricatorProjectSubprojectWarningController.php

@@ -0,0 +1,51 @@
+<?php
+
+final class PhabricatorProjectSubprojectWarningController
+  extends PhabricatorProjectController {
+
+  public function handleRequest(AphrontRequest $request) {
+    $viewer = $request->getViewer();
+
+    $response = $this->loadProject();
+    if ($response) {
+      return $response;
+    }
+
+    $project = $this->getProject();
+
+    $can_edit = PhabricatorPolicyFilter::hasCapability(
+      $viewer,
+      $project,
+      PhabricatorPolicyCapability::CAN_EDIT);
+
+    if (!$can_edit) {
+      return new Aphront404Response();
+    }
+
+    $id = $project->getID();
+    $cancel_uri = "/project/subprojects/{$id}/";
+    $done_uri = "/project/edit/?parent={$id}";
+
+    if ($request->isFormPost()) {
+      return id(new AphrontRedirectResponse())
+        ->setURI($done_uri);
+    }
+
+    $doc_href = PhabricatorEnv::getDoclink('Projects User Guide');
+
+    $conversion_help = pht(
+      "Creating a project's first subproject **moves all ".
+      "members** and **destroys all workboard columns**.".
+      "\n\n".
+      "See [[ %s | Projects User Guide ]] in the documentation for details. ".
+      "This process can not be undone.",
+      $doc_href);
+
+    return $this->newDialog()
+      ->setTitle(pht('Convert to Parent Project'))
+      ->appendChild(new PHUIRemarkupView($viewer, $conversion_help))
+      ->addCancelButton($cancel_uri)
+      ->addSubmitButton(pht('Convert Project'));
+  }
+
+}

src/applications/project/controller/PhabricatorProjectSubprojectsController.php

@@ -23,9 +23,10 @@ final class PhabricatorProjectSubprojectsController
       $project,
       PhabricatorPolicyCapability::CAN_EDIT);
 
-    $has_support = $project->supportsSubprojects();
+    $allows_subprojects = $project->supportsSubprojects();
+    $allows_milestones = $project->supportsMilestones();
 
-    if ($has_support) {
+    if ($allows_subprojects) {
       $subprojects = id(new PhabricatorProjectQuery())
         ->setViewer($viewer)
         ->withParentProjectPHIDs(array($project->getPHID()))
@@ -36,44 +37,57 @@ final class PhabricatorProjectSubprojectsController
       $subprojects = array();
     }
 
-    $can_create = $can_edit && $has_support;
-
-    if ($project->getHasSubprojects()) {
-      $button_text = pht('Create Subproject');
+    if ($allows_milestones) {
+      $milestones = id(new PhabricatorProjectQuery())
+        ->setViewer($viewer)
+        ->withParentProjectPHIDs(array($project->getPHID()))
+        ->needImages(true)
+        ->withIsMilestone(true)
+        ->setOrder('newest')
+        ->execute();
     } else {
-      $button_text = pht('Add Subprojects');
+      $milestones = array();
     }
 
-    $header = id(new PHUIHeaderView())
-      ->setHeader(pht('Subprojects'))
-      ->addActionLink(
-        id(new PHUIButtonView())
-          ->setTag('a')
-          ->setHref("/project/edit/?parent={$id}")
-          ->setIcon('fa-plus')
-          ->setDisabled(!$can_create)
-          ->setWorkflow(!$can_create)
-          ->setText($button_text));
-
-    $box = id(new PHUIObjectBoxView())
-      ->setHeader($header);
-
-    if (!$has_support) {
-      $no_support = pht(
-        'This project is a milestone. Milestones can not have subprojects.');
-
-      $info_view = id(new PHUIInfoView())
-        ->setErrors(array($no_support))
-        ->setSeverity(PHUIInfoView::SEVERITY_WARNING);
-
-      $box->setInfoView($info_view);
+    if ($milestones) {
+      $milestone_list = id(new PHUIObjectBoxView())
+        ->setHeaderText(pht('Milestones'))
+        ->setObjectList(
+          id(new PhabricatorProjectListView())
+            ->setUser($viewer)
+            ->setProjects($milestones)
+            ->renderList());
+    } else {
+      $milestone_list = null;
     }
 
-    $box->setObjectList(
+    if ($subprojects) {
+      $subproject_list = id(new PHUIObjectBoxView())
+        ->setHeaderText(pht('Subprojects'))
+        ->setObjectList(
           id(new PhabricatorProjectListView())
             ->setUser($viewer)
             ->setProjects($subprojects)
             ->renderList());
+    } else {
+      $subproject_list = null;
+    }
+
+    $property_list = $this->buildPropertyList(
+      $project,
+      $milestones,
+      $subprojects);
+
+    $action_list = $this->buildActionList(
+      $project,
+      $milestones,
+      $subprojects);
+
+    $property_list->setActionList($action_list);
+
+    $header_box = id(new PHUIObjectBoxView())
+      ->setHeaderText(pht('Subprojects and Milestones'))
+      ->addPropertyList($property_list);
 
     $nav = $this->getProfileMenu();
     $nav->selectFilter(PhabricatorProject::PANEL_SUBPROJECTS);
@@ -85,7 +99,151 @@ final class PhabricatorProjectSubprojectsController
       ->setNavigation($nav)
       ->setCrumbs($crumbs)
       ->setTitle(array($project->getName(), pht('Subprojects')))
-      ->appendChild($box);
+      ->appendChild(
+        array(
+          $header_box,
+          $milestone_list,
+          $subproject_list,
+        ));
   }
 
+  private function buildPropertyList(
+    PhabricatorProject $project,
+    array $milestones,
+    array $subprojects) {
+    $viewer = $this->getViewer();
+
+    $view = id(new PHUIPropertyListView())
+      ->setUser($viewer);
+
+    $view->addProperty(
+      pht('Prototype'),
+      $this->renderStatus(
+        'fa-exclamation-triangle red',
+        pht('Warning'),
+        pht('Subprojects and milestones are only partially implemented.')));
+
+    if (!$project->supportsMilestones()) {
+      $milestone_status = $this->renderStatus(
+        'fa-times grey',
+        pht('Already Milestone'),
+        pht(
+          'This project is already a milestone, and milestones may not '.
+          'have their own milestones.'));
+    } else {
+      if (!$milestones) {
+        $milestone_status = $this->renderStatus(
+          'fa-check grey',
+          pht('None Created'),
+          pht(
+            'You can create milestones for this project.'));
+      } else {
+        $milestone_status = $this->renderStatus(
+          'fa-check green',
+          pht('Has Milestones'),
+          pht('This project has milestones.'));
+      }
+    }
+
+    $view->addProperty(pht('Milestones'), $milestone_status);
+
+    if (!$project->supportsSubprojects()) {
+      $subproject_status = $this->renderStatus(
+        'fa-times grey',
+        pht('Milestone'),
+        pht(
+          'This project is a milestone, and milestones may not have '.
+          'subprojects.'));
+    } else {
+      if (!$subprojects) {
+        $subproject_status = $this->renderStatus(
+          'fa-check grey',
+          pht('None Created'),
+          pht('You can create subprojects for this project.'));
+      } else {
+        $subproject_status = $this->renderStatus(
+          'fa-check green',
+          pht('Has Subprojects'),
+          pht(
+            'This project has subprojects.'));
+      }
+    }
+
+    $view->addProperty(pht('Subprojects'), $subproject_status);
+
+    return $view;
+  }
+
+  private function buildActionList(
+    PhabricatorProject $project,
+    array $milestones,
+    array $subprojects) {
+    $viewer = $this->getViewer();
+    $id = $project->getID();
+
+    $can_edit = PhabricatorPolicyFilter::hasCapability(
+      $viewer,
+      $project,
+      PhabricatorPolicyCapability::CAN_EDIT);
+
+    $allows_milestones = $project->supportsMilestones();
+    $allows_subprojects = $project->supportsSubprojects();
+
+    $view = id(new PhabricatorActionListView())
+      ->setUser($viewer);
+
+    if ($allows_milestones && $milestones) {
+      $milestone_text = pht('Create Next Milestone');
+    } else {
+      $milestone_text = pht('Create Milestone');
+    }
+
+    $can_milestone = ($can_edit && $allows_milestones);
+    $milestone_href = "/project/edit/?milestone={$id}";
+
+    $view->addAction(
+      id(new PhabricatorActionView())
+        ->setName($milestone_text)
+        ->setIcon('fa-plus')
+        ->setHref($milestone_href)
+        ->setDisabled(!$can_milestone)
+        ->setWorkflow(!$can_milestone));
+
+    $can_subproject = ($can_edit && $allows_subprojects);
+
+    // If we're offering to create the first subproject, we're going to warn
+    // the user about the effects before moving forward.
+    if ($can_subproject && !$subprojects) {
+      $subproject_href = "/project/warning/{$id}/";
+      $subproject_disabled = false;
+      $subproject_workflow = true;
+    } else {
+      $subproject_href = "/project/edit/?parent={$id}";
+      $subproject_disabled = !$can_subproject;
+      $subproject_workflow = !$can_subproject;
+    }
+
+    $view->addAction(
+      id(new PhabricatorActionView())
+        ->setName(pht('Create Subproject'))
+        ->setIcon('fa-plus')
+        ->setHref($subproject_href)
+        ->setDisabled($subproject_disabled)
+        ->setWorkflow($subproject_workflow));
+
+    return $view;
+  }
+
+  private function renderStatus($icon, $target, $note) {
+    $item = id(new PHUIStatusItemView())
+      ->setIcon($icon)
+      ->setTarget(phutil_tag('strong', array(), $target))
+      ->setNote($note);
+
+    return id(new PHUIStatusListView())
+      ->addItem($item);
+  }
+
+
+
 }

src/applications/project/engine/PhabricatorProjectProfilePanelEngine.php

@@ -28,6 +28,10 @@ final class PhabricatorProjectProfilePanelEngine
       ->setBuiltinKey(PhabricatorProject::PANEL_MEMBERS)
       ->setPanelKey(PhabricatorProjectMembersProfilePanel::PANELKEY);
 
+    $panels[] = $this->newPanel()
+      ->setBuiltinKey(PhabricatorProject::PANEL_SUBPROJECTS)
+      ->setPanelKey(PhabricatorProjectSubprojectsProfilePanel::PANELKEY);
+
     $panels[] = $this->newPanel()
       ->setBuiltinKey(PhabricatorProject::PANEL_MANAGE)
       ->setPanelKey(PhabricatorProjectManageProfilePanel::PANELKEY);

src/applications/project/engineextension/PhabricatorProjectsMembershipIndexEngineExtension.php

@@ -61,6 +61,15 @@ final class PhabricatorProjectsMembershipIndexEngineExtension
 
     $conn_w = $project->establishConnection('w');
 
+    $any_milestone = queryfx_one(
+      $conn_w,
+      'SELECT id FROM %T
+        WHERE parentProjectPHID = %s AND milestoneNumber IS NOT NULL
+        LIMIT 1',
+      $project->getTableName(),
+      $project_phid);
+    $has_milestones = (bool)$any_milestone;
+
     $project->openTransaction();
 
       // Delete any existing materialized member edges.
@@ -92,6 +101,14 @@ final class PhabricatorProjectsMembershipIndexEngineExtension
         (int)$has_subprojects,
         $project->getID());
 
+      // Update the hasMilestones flag.
+      queryfx(
+        $conn_w,
+        'UPDATE %T SET hasMilestones = %d WHERE id = %d',
+        $project->getTableName(),
+        (int)$has_milestones,
+        $project->getID());
+
     $project->saveTransaction();
   }
 

src/applications/project/profilepanel/PhabricatorProjectSubprojectsProfilePanel.php

@@ -0,0 +1,63 @@
+<?php
+
+final class PhabricatorProjectSubprojectsProfilePanel
+  extends PhabricatorProfilePanel {
+
+  const PANELKEY = 'project.subprojects';
+
+  public function getPanelTypeName() {
+    return pht('Project Subprojects');
+  }
+
+  private function getDefaultName() {
+    return pht('Subprojects');
+  }
+
+  public function getDisplayName(
+    PhabricatorProfilePanelConfiguration $config) {
+    $name = $config->getPanelProperty('name');
+
+    if (strlen($name)) {
+      return $name;
+    }
+
+    return $this->getDefaultName();
+  }
+
+  public function buildEditEngineFields(
+    PhabricatorProfilePanelConfiguration $config) {
+    return array(
+      id(new PhabricatorTextEditField())
+        ->setKey('name')
+        ->setLabel(pht('Name'))
+        ->setPlaceholder($this->getDefaultName())
+        ->setValue($config->getPanelProperty('name')),
+    );
+  }
+
+  protected function newNavigationMenuItems(
+    PhabricatorProfilePanelConfiguration $config) {
+
+    $project = $config->getProfileObject();
+
+    $has_children = ($project->getHasSubprojects()) ||
+                    ($project->getHasMilestones());
+
+    $id = $project->getID();
+
+    $name = $this->getDisplayName($config);
+    $icon = 'fa-sitemap';
+    $href = "/project/subprojects/{$id}/";
+
+    $item = $this->newItem()
+      ->setHref($href)
+      ->setName($name)
+      ->setDisabled(!$has_children)
+      ->setIcon($icon);
+
+    return array(
+      $item,
+    );
+  }
+
+}

src/docs/user/userguide/projects.diviner

@@ -135,6 +135,118 @@ members or won't have a workboard, you can hide these items to streamline the
 menu.
 
 
+Subprojects and Milestones
+==========================
+
+IMPORTANT: This feature is only partially implemented.
+
+After creating a project, you can use the
+{nav icon="sitemap", name="Subprojects"} menu item to add subprojects or
+milestones.
+
+**Subprojects** are projects that are contained inside the main project. You
+can use them to break large or complex groups, tags, lists, or undertakings
+apart into smaller pieces.
+
+**Milestones** are a special kind of subproject for organizing tasks into
+blocks of work. You can use them to implement sprints, iterations, milestones,
+versions, etc.
+
+Subprojects and milestones have some additional special behaviors and rules,
+particularly around policies and membership. See below for details.
+
+This is a brief summary of the major differences between normal projects,
+subprojects, parent projects, and milestones.
+
+| | Normal | Parent | Subproject | Milestone |
+|---|---|---|---|---|
+| //Members// | Yes | Union of Subprojects | Yes | Same as Parent |
+| //Policies// | Yes | Yes | Affected by Parent | Same as Parent |
+| //Workboard// | Yes | No Custom Columns | Yes | Yes |
+| //Hashtags// | Yes | Yes | Yes | Special |
+
+
+Subprojects
+===========
+
+Subprojects are full-power projects that are contained inside some parent
+project. You can use them to divide a large or complex project into smaller
+parts.
+
+Subprojects have normal members and normal policies, but note that the policies
+of the parent project affect the policies of the subproject (see "Parent
+Projects", below).
+
+Subprojects can have their own subprojects, milestones, or both. If a
+subproject has its own subprojects, it is both a subproject and a parent
+project. Thus, the parent project rules apply to it, and are stronger than the
+subproject rules.
+
+Subprojects can have normal workboards.
+
+
+Milestones
+==========
+
+Milestones are simple subprojects for tracking sprints, iterations, versions,
+or other similar blocks of work. Milestones make it easier to create and manage
+a large number of similar subprojects (for example: {nav Sprint 1},
+{nav Sprint 2}, {nav Sprint 3}, etc).
+
+Milestones can not have direct members or policies. Instead, the membership
+and policies of a milestones are always the same as the milestone's parent
+project. This makes large numbers of milestones more manageable when changes
+occur.
+
+Milestones can not have subprojects, and can not have their own milestones.
+
+By default, Milestones do not have their own hashtags.
+
+Milestones can have normal workboards.
+
+
+Parent Projects
+===============
+
+When you add the first subproject to an existing project, it is converted into
+a **parent project**. Parent projects have some special rules.
+
+**No Direct Members**: Parent projects can not have members of their own.
+Instead, all of the users who are members of any subproject count as members
+of the parent project. By joining (or leaving) a subproject, a user is
+implicitly added to (or removed from) all ancestors of that project.
+
+Consequently, when you add the first subproject to an existing project, all of
+the project's current members are moved to become members of the subproject
+instead. Implicitly, they will remain members of the parent project because the
+parent project is an ancestor of the new subproject.
+
+You can edit the project afterward to change or remove members if you want to
+split membership apart in a more granular way across multiple new subprojects.
+
+**No Workboard Columns**: Parent projects can not have their own workboard
+columns: instead, the workboard of a parent project shows columns representing
+the child projects.
+
+Thus, a project's workboard columns are destroyed when you add the first
+subproject. All objects on the workboard will be returned to the project's
+backlog. The new board will show columns for subprojects instead.
+
+**Searching**: When you search for a parent project, results for any subproject
+are returned. For example, if you search for {nav Engineering}, your query will
+match results in {nav Engineering} itself, but also subprojects like
+{nav Engineering > Warp Drive} and {nav Engineering > Shield Batteries}.
+
+**Policy Effects**: To view a subproject or milestone, you must be able to
+view the parent project. As a result, the parent project's view policy now
+affects child projects. If you restrict the visibility of the parent, you also
+restrict the visibility of the children.
+
+In contrast, permission to edit a parent project grants permission to edit
+any subproject. If a user can {nav Root Project}, they can also edit
+{nav Root Project > Child} and {nav Root Project > Child > Sprint 3}.
+
+
 Policies In Depth
 =================