Specialize rendering of self-URIs in the form "/X123"

Summary:
Depends on D20510. Ref T5378. When remarkup includes a hyperlink to the current install in the form "/X123" (which is common), load the corresponding object and specialize the rendering.

This doesn't cover everything (notably, no handling for Diffusion paths yet), but does cover a lot of the most common cases.

The "uri" form preserves the URI as written, but adds an icon, tag, and hovercard.

The "{uri}" form is more similar to `{T123}` and shows the object name.

Test Plan: {F6440367}

Reviewers: amckinley, joshuaspence

Reviewed By: joshuaspence

Subscribers: joshuaspence

Maniphest Tasks: T5378

Differential Revision: https://secure.phabricator.com/D20512

src/__phutil_library_map__.php

@@ -4548,6 +4548,7 @@ phutil_register_library_map(array(
     'PhabricatorSecuritySetupCheck' => 'applications/config/check/PhabricatorSecuritySetupCheck.php',
     'PhabricatorSelectEditField' => 'applications/transactions/editfield/PhabricatorSelectEditField.php',
     'PhabricatorSelectSetting' => 'applications/settings/setting/PhabricatorSelectSetting.php',
+    'PhabricatorSelfHyperlinkEngineExtension' => 'applications/meta/engineextension/PhabricatorSelfHyperlinkEngineExtension.php',
     'PhabricatorSessionsSettingsPanel' => 'applications/settings/panel/PhabricatorSessionsSettingsPanel.php',
     'PhabricatorSetConfigType' => 'applications/config/type/PhabricatorSetConfigType.php',
     'PhabricatorSetting' => 'applications/settings/setting/PhabricatorSetting.php',
@@ -10858,6 +10859,7 @@ phutil_register_library_map(array(
     'PhabricatorSecuritySetupCheck' => 'PhabricatorSetupCheck',
     'PhabricatorSelectEditField' => 'PhabricatorEditField',
     'PhabricatorSelectSetting' => 'PhabricatorSetting',
+    'PhabricatorSelfHyperlinkEngineExtension' => 'PhutilRemarkupHyperlinkEngineExtension',
     'PhabricatorSessionsSettingsPanel' => 'PhabricatorSettingsPanel',
     'PhabricatorSetConfigType' => 'PhabricatorTextConfigType',
     'PhabricatorSetting' => 'Phobject',

src/applications/meta/engineextension/PhabricatorSelfHyperlinkEngineExtension.php

@@ -0,0 +1,88 @@
+<?php
+
+final class PhabricatorSelfHyperlinkEngineExtension
+  extends PhutilRemarkupHyperlinkEngineExtension {
+
+  const LINKENGINEKEY = 'phabricator-self';
+
+  public function processHyperlinks(array $hyperlinks) {
+    $engine = $this->getEngine();
+    $viewer = $engine->getConfig('viewer');
+
+    // If we don't have a valid viewer, just bail out. We aren't going to be
+    // able to do very much.
+    if (!$viewer) {
+      return;
+    }
+
+    // Find links which point to resources on the Phabricator install itself.
+    // We're going to try to enhance these.
+    $self_links = array();
+    foreach ($hyperlinks as $link) {
+      $uri = $link->getURI();
+      if (PhabricatorEnv::isSelfURI($uri)) {
+        $self_links[] = $link;
+      }
+    }
+
+    // For links in the form "/X123", we can reasonably guess that they are
+    // fairly likely to be object names. Try to look them up.
+    $object_names = array();
+    foreach ($self_links as $key => $link) {
+      $uri = new PhutilURI($link->getURI());
+
+      $matches = null;
+      $path = $uri->getPath();
+      if (!preg_match('(^/([^/]+)\z)', $path, $matches)) {
+        continue;
+      }
+
+      $object_names[$key] = $matches[1];
+    }
+
+    if ($object_names) {
+      $object_query = id(new PhabricatorObjectQuery())
+        ->setViewer($viewer)
+        ->withNames($object_names);
+
+      $object_query->execute();
+
+      $object_map = $object_query->getNamedResults();
+    } else {
+      $object_map = array();
+    }
+
+    if ($object_map) {
+      $handles = $viewer->loadHandles(mpull($object_map, 'getPHID'));
+    } else {
+      $handles = array();
+    }
+
+    foreach ($object_names as $key => $object_name) {
+      $object = idx($object_map, $object_name);
+      if (!$object) {
+        continue;
+      }
+
+      $phid = $object->getPHID();
+      $handle = $handles[$phid];
+
+      $link = $self_links[$key];
+      $raw_uri = $link->getURI();
+      $is_embed = $link->isEmbed();
+
+      $tag = $handle->renderTag()
+        ->setPHID($phid)
+        ->setHref($raw_uri);
+
+      if (!$is_embed) {
+        $tag->setName($raw_uri);
+      }
+
+      $link->setResult($tag);
+
+      unset($self_links[$key]);
+    }
+  }
+
+}