Basic @mentions support

Summary:
Provides basic Remarkup support for @mentions. No application integration yet so
these aren't terribly useful until that happens.

Test Plan:
https://secure.phabricator.com/file/view/PHID-FILE-83d68e7af6085ae928df/

Reviewers: tomo, mroch, jsp
Commenters: tomo
CC: aran, tomo, epriestley
Differential Revision: 517

src/__celerity_resource_map__.php

@@ -1057,7 +1057,7 @@ celerity_register_resource_map(array(
   ),
   'phabricator-remarkup-css' =>
   array(
-    'uri' => '/res/774d4078/rsrc/css/core/remarkup.css',
+    'uri' => '/res/d7e98209/rsrc/css/core/remarkup.css',
     'type' => 'css',
     'requires' =>
     array(
@@ -1132,7 +1132,7 @@ celerity_register_resource_map(array(
       'uri' => '/res/pkg/2892314d/typeahead.pkg.js',
       'type' => 'js',
     ),
-    'c2d123fd' =>
+    'd752b5da' =>
     array (
       'name' => 'core.pkg.css',
       'symbols' =>
@@ -1153,7 +1153,7 @@ celerity_register_resource_map(array(
         13 => 'phabricator-remarkup-css',
         14 => 'syntax-highlighting-css',
       ),
-      'uri' => '/res/pkg/c2d123fd/core.pkg.css',
+      'uri' => '/res/pkg/d752b5da/core.pkg.css',
       'type' => 'css',
     ),
     'da416e1c' =>
@@ -1225,15 +1225,15 @@ celerity_register_resource_map(array(
   ),
   'reverse' =>
   array (
-    'aphront-crumbs-view-css' => 'c2d123fd',
-    'aphront-dialog-view-css' => 'c2d123fd',
-    'aphront-form-view-css' => 'c2d123fd',
-    'aphront-list-filter-view-css' => 'c2d123fd',
-    'aphront-panel-view-css' => 'c2d123fd',
-    'aphront-side-nav-view-css' => 'c2d123fd',
-    'aphront-table-view-css' => 'c2d123fd',
-    'aphront-tokenizer-control-css' => 'c2d123fd',
-    'aphront-typeahead-control-css' => 'c2d123fd',
+    'aphront-crumbs-view-css' => 'd752b5da',
+    'aphront-dialog-view-css' => 'd752b5da',
+    'aphront-form-view-css' => 'd752b5da',
+    'aphront-list-filter-view-css' => 'd752b5da',
+    'aphront-panel-view-css' => 'd752b5da',
+    'aphront-side-nav-view-css' => 'd752b5da',
+    'aphront-table-view-css' => 'd752b5da',
+    'aphront-tokenizer-control-css' => 'd752b5da',
+    'aphront-typeahead-control-css' => 'd752b5da',
     'differential-changeset-view-css' => '55967526',
     'differential-core-view-css' => '55967526',
     'differential-revision-add-comment-css' => '55967526',
@@ -1270,13 +1270,13 @@ celerity_register_resource_map(array(
     'javelin-util' => 'db95a6d0',
     'javelin-vector' => 'db95a6d0',
     'javelin-workflow' => 'f1d27e2a',
-    'phabricator-core-buttons-css' => 'c2d123fd',
-    'phabricator-core-css' => 'c2d123fd',
-    'phabricator-directory-css' => 'c2d123fd',
+    'phabricator-core-buttons-css' => 'd752b5da',
+    'phabricator-core-css' => 'd752b5da',
+    'phabricator-directory-css' => 'd752b5da',
     'phabricator-keyboard-shortcut' => 'f1d27e2a',
     'phabricator-keyboard-shortcut-manager' => 'f1d27e2a',
-    'phabricator-remarkup-css' => 'c2d123fd',
-    'phabricator-standard-page-view' => 'c2d123fd',
-    'syntax-highlighting-css' => 'c2d123fd',
+    'phabricator-remarkup-css' => 'd752b5da',
+    'phabricator-standard-page-view' => 'd752b5da',
+    'syntax-highlighting-css' => 'd752b5da',
   ),
 ));

src/__phutil_library_map__.php

@@ -440,6 +440,7 @@ phutil_register_library_map(array(
     'PhabricatorRemarkupRuleDiffusion' => 'infrastructure/markup/remarkup/markuprule/diffusion',
     'PhabricatorRemarkupRuleImageMacro' => 'infrastructure/markup/remarkup/markuprule/imagemacro',
     'PhabricatorRemarkupRuleManiphest' => 'infrastructure/markup/remarkup/markuprule/maniphest',
+    'PhabricatorRemarkupRuleMention' => 'infrastructure/markup/remarkup/markuprule/mention',
     'PhabricatorRemarkupRuleObjectName' => 'infrastructure/markup/remarkup/markuprule/objectname',
     'PhabricatorRemarkupRuleProxyImage' => 'infrastructure/markup/remarkup/markuprule/proxyimage',
     'PhabricatorRemarkupRuleYoutube' => 'infrastructure/markup/remarkup/markuprule/youtube',
@@ -907,6 +908,7 @@ phutil_register_library_map(array(
     'PhabricatorRemarkupRuleDiffusion' => 'PhutilRemarkupRule',
     'PhabricatorRemarkupRuleImageMacro' => 'PhutilRemarkupRule',
     'PhabricatorRemarkupRuleManiphest' => 'PhabricatorRemarkupRuleObjectName',
+    'PhabricatorRemarkupRuleMention' => 'PhutilRemarkupRule',
     'PhabricatorRemarkupRuleObjectName' => 'PhutilRemarkupRule',
     'PhabricatorRemarkupRuleProxyImage' => 'PhutilRemarkupRule',
     'PhabricatorRemarkupRuleYoutube' => 'PhutilRemarkupRule',

src/applications/differential/parser/markup/DifferentialMarkupEngineFactory.php

@@ -42,6 +42,7 @@ class DifferentialMarkupEngineFactory {
     $rules[] = new PhabricatorRemarkupRuleDiffusion();
     $rules[] = new PhabricatorRemarkupRuleManiphest();
     $rules[] = new PhabricatorRemarkupRuleImageMacro();
+    $rules[] = new PhabricatorRemarkupRuleMention();
 
     $custom_rule_classes =
       PhabricatorEnv::getEnvConfig('differential.custom-remarkup-rules');

src/applications/differential/parser/markup/__init__.php

@@ -11,6 +11,7 @@ phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/
 phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/diffusion');
 phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/imagemacro');
 phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/maniphest');
+phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/mention');
 phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/proxyimage');
 phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/youtube');
 

src/infrastructure/markup/remarkup/markuprule/mention/PhabricatorRemarkupRuleMention.php

@@ -0,0 +1,93 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @group markup
+ */
+class PhabricatorRemarkupRuleMention
+  extends PhutilRemarkupRule {
+
+  private $actualUsers;
+
+  public function apply($text) {
+
+    // NOTE: Negative lookahead for period prevents us from picking up email
+    // addresses, while allowing constructs like "@tomo, lol".
+    $regexp = '/@([a-zA-Z0-9]+)\b(?![.])/';
+
+    $matches = null;
+    $ok = preg_match_all($regexp, $text, $matches);
+    if (!$ok) {
+      // No mentions in this text.
+      return $text;
+    }
+
+    $usernames = $matches[1];
+
+    // TODO: This is a little sketchy perf-wise. Once APC comes up, it is an
+    // ideal candidate to back with an APC cache.
+    $user_table = new PhabricatorUser();
+    $real_user_names = queryfx_all(
+      $user_table->establishConnection('r'),
+      'SELECT username, phid, realName FROM %T WHERE username IN (%Ls)',
+      $user_table->getTableName(),
+      $usernames);
+
+    foreach ($real_user_names as $row) {
+      $this->actualUsers[strtolower($row['username'])] = $row;
+    }
+
+    return preg_replace_callback(
+      $regexp,
+      array($this, 'markupMention'),
+      $text);
+  }
+
+  public function markupMention($matches) {
+    $username = strtolower($matches[1]);
+    $exists = isset($this->actualUsers[$username]);
+
+    $real = $this->actualUsers[$username]['realName'];
+
+    $class = $exists
+      ? 'phabricator-remarkup-mention-exists'
+      : 'phabricator-remarkup-mention-unknown';
+
+    if ($exists) {
+      $tag = phutil_render_tag(
+        'a',
+        array(
+          'class'   => $class,
+          'href'    => '/p/'.$username.'/',
+          'target'  => '_blank',
+          'title'   => $real,
+        ),
+        phutil_escape_html('@'.$username));
+    } else {
+      $tag = phutil_render_tag(
+        'span',
+        array(
+          'class' => $class,
+        ),
+        phutil_escape_html('@'.$username));
+    }
+
+    return $this->getEngine()->storeText($tag);
+  }
+
+}

src/infrastructure/markup/remarkup/markuprule/mention/__init__.php

@@ -0,0 +1,16 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phabricator', 'applications/people/storage/user');
+phutil_require_module('phabricator', 'storage/queryfx');
+
+phutil_require_module('phutil', 'markup');
+phutil_require_module('phutil', 'markup/engine/remarkup/markuprule/base');
+
+
+phutil_require_source('PhabricatorRemarkupRuleMention.php');

webroot/rsrc/css/core/remarkup.css

@@ -59,3 +59,15 @@
   max-width: 640px;
   max-height: 640px;
 }
+
+.phabricator-remarkup-mention-exists {
+  font-weight: bold;
+  padding: 0 .25em;
+  background: #aaffaa;
+}
+
+.aphront-panel-preview .phabricator-remarkup-mention-unknown {
+  font-weight: bold;
+  padding: 0 .25em;
+  background: #ffaaaa;
+}