Add maniphest.subtypes for configuring task subtypes

Summary:
Ref T12314. Builds toward letting you define "animal" and "plant" tasks.

This just adds some configuration. I'll probably add some more quality-of-life options (like "icon") later but these are the only bits I'm sure I'll need.

Test Plan:
  - Configured sensible subtypes.
  - Tried to configure bad subtypes: bad key, missing "default", duplicate keys. Got sensible error messages.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12314

Differential Revision: https://secure.phabricator.com/D17440

src/__phutil_library_map__.php

@@ -1471,6 +1471,7 @@ phutil_register_library_map(array(
     'ManiphestStatusConfigOptionType' => 'applications/maniphest/config/ManiphestStatusConfigOptionType.php',
     'ManiphestStatusEmailCommand' => 'applications/maniphest/command/ManiphestStatusEmailCommand.php',
     'ManiphestSubpriorityController' => 'applications/maniphest/controller/ManiphestSubpriorityController.php',
+    'ManiphestSubtypesConfigOptionsType' => 'applications/maniphest/config/ManiphestSubtypesConfigOptionsType.php',
     'ManiphestTask' => 'applications/maniphest/storage/ManiphestTask.php',
     'ManiphestTaskAssignHeraldAction' => 'applications/maniphest/herald/ManiphestTaskAssignHeraldAction.php',
     'ManiphestTaskAssignOtherHeraldAction' => 'applications/maniphest/herald/ManiphestTaskAssignOtherHeraldAction.php',
@@ -6348,6 +6349,7 @@ phutil_register_library_map(array(
     'ManiphestStatusConfigOptionType' => 'PhabricatorConfigJSONOptionType',
     'ManiphestStatusEmailCommand' => 'ManiphestEmailCommand',
     'ManiphestSubpriorityController' => 'ManiphestController',
+    'ManiphestSubtypesConfigOptionsType' => 'PhabricatorConfigJSONOptionType',
     'ManiphestTask' => array(
       'ManiphestDAO',
       'PhabricatorSubscribableInterface',

src/applications/maniphest/config/ManiphestSubtypesConfigOptionsType.php

@@ -0,0 +1,10 @@
+<?php
+
+final class ManiphestSubtypesConfigOptionsType
+  extends PhabricatorConfigJSONOptionType {
+
+  public function validateOption(PhabricatorConfigOption $option, $value) {
+    PhabricatorEditEngineSubtype::validateConfiguration($value);
+  }
+
+}

src/applications/maniphest/config/PhabricatorManiphestConfigOptions.php

@@ -297,6 +297,50 @@ See the example below for a starting point.
 EOTEXT
 ));
 
+    $subtype_type = 'custom:ManiphestSubtypesConfigOptionsType';
+    $subtype_default_key = PhabricatorEditEngineSubtype::SUBTYPE_DEFAULT;
+    $subtype_example = array(
+      array(
+        'key' => $subtype_default_key,
+        'name' => pht('Task'),
+      ),
+      array(
+        'key' => 'bug',
+        'name' => pht('Bug'),
+      ),
+      array(
+        'key' => 'feature',
+        'name' => pht('Feature Request'),
+      ),
+    );
+    $subtype_example = id(new PhutilJSON())->encodeAsList($subtype_example);
+
+    $subtype_default = array(
+      array(
+        'key' => $subtype_default_key,
+        'name' => pht('Task'),
+      ),
+    );
+
+    $subtype_description = $this->deformat(pht(<<<EOTEXT
+Allows you to define task subtypes. Subtypes let you hide fields you don't
+need to simplify the workflows for editing tasks.
+
+To define subtypes, provide a list of subtypes. Each subtype should be a
+dictionary with these keys:
+
+  - `key` //Required string.// Internal identifier for the subtype, like
+    "task", "feature", or "bug".
+  - `name` //Required string.// Human-readable name for this subtype, like
+    "Task", "Feature Request" or "Bug Report".
+
+Each subtype must have a unique key, and you must define a subtype with
+the key "%s", which is used as a default subtype.
+EOTEXT
+      ,
+      $subtype_default_key));
+
+
     return array(
       $this->newOption('maniphest.custom-field-definitions', 'wild', array())
         ->setSummary(pht('Custom Maniphest fields.'))
@@ -361,6 +405,10 @@ EOTEXT
         ->setDescription($points_description)
         ->addExample($points_json_1, pht('Points Config'))
         ->addExample($points_json_2, pht('Hours Config')),
+      $this->newOption('maniphest.subtypes', $subtype_type, $subtype_default)
+        ->setSummary(pht('Define task subtypes.'))
+        ->setDescription($subtype_description)
+        ->addExample($subtype_example, pht('Simple Subtypes')),
     );
   }
 

src/applications/transactions/editengine/PhabricatorEditEngineSubtype.php

@@ -32,5 +32,53 @@ final class PhabricatorEditEngineSubtype
     }
   }
 
+  public static function validateConfiguration($config) {
+    if (!is_array($config)) {
+      throw new Exception(
+        pht(
+          'Subtype configuration is invalid: it must be a list of subtype '.
+          'specifications.'));
+    }
+
+    $map = array();
+    foreach ($config as $value) {
+      PhutilTypeSpec::checkMap(
+        $value,
+        array(
+          'key' => 'string',
+          'name' => 'string',
+        ));
+
+      $key = $value['key'];
+      self::validateSubtypeKey($key);
+
+      if (isset($map[$key])) {
+        throw new Exception(
+          pht(
+            'Subtype configuration is invalid: two subtypes use the same '.
+            'key ("%s"). Each subtype must have a unique key.',
+            $key));
+      }
+
+      $map[$key] = true;
+
+      $name = $value['name'];
+      if (!strlen($name)) {
+        throw new Exception(
+          pht(
+            'Subtype configuration is invalid: subtype with key "%s" has '.
+            'no name. Subtypes must have a name.',
+            $key));
+      }
+    }
+
+    if (!isset($map[self::SUBTYPE_DEFAULT])) {
+      throw new Exception(
+        pht(
+          'Subtype configuration is invalid: there is no subtype defined '.
+          'with key "%s". This subtype is required and must be defined.',
+          self::SUBTYPE_DEFAULT));
+    }
+  }
 
 }