Implement text mode for Phabricator Remarkup rules

Test Plan:
  lang=remarkup
  D1
  {D1}
  {C1}
  {F1}
  [[ Test ]]
  iiam
  {meme, src=iiam, above="I\'m not always", below="But I am"}
  @{function:pht}
  @vrana

Reviewers: epriestley, edward

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2617

Differential Revision: https://secure.phabricator.com/D5392

src/applications/macro/remarkup/PhabricatorRemarkupRuleImageMacro.php

@@ -35,6 +35,14 @@ final class PhabricatorRemarkupRuleImageMacro
       $phid = $this->images[$name];
 
       $file = id(new PhabricatorFile())->loadOneWhere('phid = %s', $phid);
+
+      if ($this->getEngine()->isTextMode()) {
+        if ($file) {
+          $name .= ' <'.$file->getBestURI().'>';
+        }
+        return $this->getEngine()->storeText($name);
+      }
+
       $style = null;
       $src_uri = null;
       if ($file) {

src/applications/macro/remarkup/PhabricatorRemarkupRuleMeme.php

@@ -30,11 +30,18 @@ final class PhabricatorRemarkupRuleMeme
       ->alter('uppertext', $options['above'])
       ->alter('lowertext', $options['below']);
 
-    $img = phutil_tag(
-      'img',
-      array(
-        'src' => (string)$uri,
-      ));
+    if ($this->getEngine()->isTextMode()) {
+      $img =
+        ($options['above'] != '' ? "\"{$options['above']}\"\n" : '').
+        $options['src'].' <'.PhabricatorEnv::getProductionURI($uri).'>'.
+        ($options['below'] != '' ? "\n\"{$options['below']}\"" : '');
+    } else {
+      $img = phutil_tag(
+        'img',
+        array(
+          'src' => (string)$uri,
+        ));
+    }
 
     return $this->getEngine()->storeText($img);
   }