Provide user option for disabling diffusion symbol cross-references

Summary: Some people don't like these, so they should be able to turn them off.

Test Plan:
Toggled the setting on and off; loaded a page in diffusion and differential
that should have symbol cross-references, and saw that they weren't linked
when I had the setting disabled. I also checked that the symbols are still
linked when the setting hasn't been touched.

Reviewers: epriestley, vrana

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3069

src/applications/differential/view/DifferentialChangesetListView.php

@@ -132,9 +132,14 @@ final class DifferentialChangesetListView extends AphrontView {
         $ref,
         $changeset);
 
+      $prefs = $this->user->loadPreferences();
+      $pref_symbols = $prefs->getPreference(
+        PhabricatorUserPreferences::PREFERENCE_DIFFUSION_SYMBOLS);
       $detail->setChangeset($changeset);
       $detail->addButton($view_options);
+      if ($pref_symbols != 'disabled') {
         $detail->setSymbolIndex(idx($this->symbolIndexes, $key));
+      }
       $detail->setVsChangesetID(idx($this->vsMap, $changeset->getID()));
       $detail->setEditable(true);
 

src/applications/diffusion/controller/DiffusionBrowseFileController.php

@@ -231,7 +231,10 @@ final class DiffusionBrowseFileController extends DiffusionController {
 
         $lang = last(explode('.', $drequest->getPath()));
 
-        if (isset($langs[$lang])) {
+        $prefs = $this->getRequest()->getUser()->loadPreferences();
+        $pref_symbols = $prefs->getPreference(
+          PhabricatorUserPreferences::PREFERENCE_DIFFUSION_SYMBOLS);
+        if (isset($langs[$lang]) && $pref_symbols != 'disabled') {
           Javelin::initBehavior(
             'repository-crossreference',
             array(

src/applications/people/controller/settings/panels/PhabricatorUserPreferenceSettingsPanelController.php

@@ -28,6 +28,7 @@ final class PhabricatorUserPreferenceSettingsPanelController
     $pref_monospaced = PhabricatorUserPreferences::PREFERENCE_MONOSPACED;
     $pref_editor     = PhabricatorUserPreferences::PREFERENCE_EDITOR;
     $pref_titles     = PhabricatorUserPreferences::PREFERENCE_TITLES;
+    $pref_symbols    = PhabricatorUserPreferences::PREFERENCE_DIFFUSION_SYMBOLS;
 
     if ($request->isFormPost()) {
       $monospaced = $request->getStr($pref_monospaced);
@@ -37,6 +38,8 @@ final class PhabricatorUserPreferenceSettingsPanelController
 
       $preferences->setPreference($pref_titles, $request->getStr($pref_titles));
       $preferences->setPreference($pref_editor, $request->getStr($pref_editor));
+      $preferences->setPreference($pref_symbols,
+        $request->getStr($pref_symbols));
       $preferences->setPreference($pref_monospaced, $monospaced);
 
       $preferences->save();
@@ -101,6 +104,15 @@ EXAMPLE;
           '<pre class="PhabricatorMonospaced">'.
           phutil_escape_html($example_string).
           '</pre>'))
+      ->appendChild(
+        id(new AphrontFormRadioButtonControl())
+        ->setLabel('Symbol Links')
+        ->setName($pref_symbols)
+        ->setValue($preferences->getPreference($pref_symbols) ?: 'enabled')
+        ->addButton('enabled', 'Enabled (default)',
+          'Use this setting to disable linking symbol names in Differential '.
+          'and Diffusion to their definitions. This is enabled by default.')
+        ->addButton('disabled', 'Disabled', null))
       ->appendChild(
         id(new AphrontFormSubmitControl())
           ->setValue('Save Preferences'));

src/applications/people/storage/PhabricatorUserPreferences.php

@@ -31,6 +31,7 @@ final class PhabricatorUserPreferences extends PhabricatorUserDAO {
   const PREFERENCE_SEARCH_SHORTCUT   = 'search-shortcut';
 
   const PREFERENCE_DIFFUSION_VIEW    = 'diffusion-view';
+  const PREFERENCE_DIFFUSION_SYMBOLS = 'diffusion-symbols';
 
   protected $userPHID;
   protected $preferences = array();