Improve image macros

Summary:
Couple of small improvements:

- Delete `randomon` macro.
- Make name unique (deleting current conflicts randomly).
- Image macro must be alone on the line.
- Filter by name.

Test Plan:
Run SQL.
/file/macro/
/file/macro/?name=imagemacro
Try to create conflicting name.
Write this comment:

  Test imagemacro.
  imagemacro

Reviewers: aran, epriestley

Reviewed By: epriestley

CC: epriestley, Koolvin

Differential Revision: https://secure.phabricator.com/D2230

resources/sql/patches/133.imagemacro.sql

@@ -0,0 +1,2 @@
+ALTER IGNORE TABLE `phabricator_file`.`file_imagemacro`
+  ADD UNIQUE `name` (`name`);

src/applications/files/controller/macrolist/PhabricatorFileMacroListController.php

@@ -23,10 +23,15 @@ final class PhabricatorFileMacroListController
 
     $request = $this->getRequest();
 
+    $macro_table = new PhabricatorFileImageMacro();
+    if ($request->getStr('name') !== null) {
+      $macros = $macro_table->loadAllWhere(
+        'name LIKE %~',
+        $request->getStr('name'));
+    } else {
       $pager = new AphrontPagerView();
       $pager->setOffset($request->getInt('page'));
 
-    $macro_table = new PhabricatorFileImageMacro();
       $macros = $macro_table->loadAllWhere(
         '1 = 1 ORDER BY id DESC LIMIT %d, %d',
         $pager->getOffset(),
@@ -42,6 +47,7 @@ final class PhabricatorFileMacroListController
 
       $pager->setCount($count);
       $pager->setURI($request->getRequestURI(), 'page');
+    }
 
     $file_phids = mpull($macros, 'getFilePHID');
 
@@ -111,15 +117,40 @@ final class PhabricatorFileMacroListController
         'action',
       ));
 
+    $filter_form = id(new AphrontFormView())
+      ->setMethod('GET')
+      ->setAction('/file/macro/')
+      ->setUser($request->getUser())
+      ->appendChild(
+        id(new AphrontFormTextControl())
+          ->setName('name')
+          ->setLabel('Name')
+          ->setValue($request->getStr('name')))
+      ->appendChild(
+        id(new AphrontFormSubmitControl())
+          ->setValue('Filter Image Macros'));
+
+    $filter_view = new AphrontListFilterView();
+    $filter_view->appendChild($filter_form);
+    $filter_view->addButton(
+      phutil_render_tag(
+        'a',
+        array(
+          'href'  => '/file/macro/edit/',
+          'class' => 'green button',
+        ),
+        'New Image Macro'));
+
     $panel = new AphrontPanelView();
     $panel->appendChild($table);
-
     $panel->setHeader('Image Macros');
-    $panel->setCreateButton('New Image Macro', '/file/macro/edit/');
+    if ($request->getStr('name') === null) {
       $panel->appendChild($pager);
+    }
 
     $side_nav = new PhabricatorFileSideNavView();
     $side_nav->setSelectedFilter('all_macros');
+    $side_nav->appendChild($filter_view);
     $side_nav->appendChild($panel);
 
     return $this->buildStandardPageResponse(

src/applications/files/controller/macrolist/__init__.php

@@ -15,6 +15,10 @@ phutil_require_module('phabricator', 'infrastructure/javelin/markup');
 phutil_require_module('phabricator', 'storage/queryfx');
 phutil_require_module('phabricator', 'view/control/pager');
 phutil_require_module('phabricator', 'view/control/table');
+phutil_require_module('phabricator', 'view/form/base');
+phutil_require_module('phabricator', 'view/form/control/submit');
+phutil_require_module('phabricator', 'view/form/control/text');
+phutil_require_module('phabricator', 'view/layout/listfilter');
 phutil_require_module('phabricator', 'view/layout/panel');
 
 phutil_require_module('phutil', 'markup');

src/infrastructure/markup/remarkup/markuprule/imagemacro/PhabricatorRemarkupRuleImageMacro.php

@@ -22,52 +22,25 @@
 final class PhabricatorRemarkupRuleImageMacro
   extends PhutilRemarkupRule {
 
-  const RANDOM_IMAGE_NAME = 'randomon';
   private $images = array();
-  private $hash = 0;
 
   public function __construct() {
     $rows = id(new PhabricatorFileImageMacro())->loadAll();
     foreach ($rows as $row) {
       $this->images[$row->getName()] = $row->getFilePHID();
     }
-    $this->images[self::RANDOM_IMAGE_NAME] = '';
-    $this->hash = 0;
   }
 
   public function apply($text) {
     return preg_replace_callback(
-      '@\b([a-zA-Z0-9_\-]+)\b@',
+      '@^([a-zA-Z0-9_\-]+)$@m',
       array($this, 'markupImageMacro'),
       $text);
   }
 
-  /**
-   * Silly function for generating some 'randomness' based on the
-   * words in the text
-   */
-  private function updateHash($word) {
-    // Simple Jenkins hash
-    for ($ii = 0; $ii < strlen($word); $ii++) {
-      $this->hash += ord($word[$ii]);
-      $this->hash += ($this->hash << 10);
-      $this->hash ^= ($this->hash >> 6);
-    }
-  }
-
   public function markupImageMacro($matches) {
-    // Update the hash that is used for defining each 'randomon' image. This way
-    // each 'randomon' image will be different, but they won't change when the
-    // text is updated.
-    $this->updateHash($matches[1]);
-
     if (array_key_exists($matches[1], $this->images)) {
-      if ($matches[1] === self::RANDOM_IMAGE_NAME) {
-        $keys = array_keys($this->images);
-        $phid = $this->images[$keys[$this->hash % count($this->images)]];
-      } else {
       $phid = $this->images[$matches[1]];
-      }
 
       $file = id(new PhabricatorFile())->loadOneWhere('phid = %s', $phid);
       if ($file) {