Provide transaction-based edits of repository encoding

Summary: Adds support for the "encoding" field to the new transactional interface.

Test Plan:
{F44189}

{F44190}

Some of the encodings in the second screen are from testing, and can no longer be set.

Reviewers: btrahan, chad

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6035

src/applications/diffusion/controller/DiffusionRepositoryEditEncodingController.php

@@ -0,0 +1,120 @@
+<?php
+
+final class DiffusionRepositoryEditEncodingController
+  extends DiffusionController {
+
+  public function processRequest() {
+    $request = $this->getRequest();
+    $user = $request->getUser();
+    $drequest = $this->diffusionRequest;
+    $repository = $drequest->getRepository();
+
+    $repository = id(new PhabricatorRepositoryQuery())
+      ->setViewer($user)
+      ->requireCapabilities(
+        array(
+          PhabricatorPolicyCapability::CAN_VIEW,
+          PhabricatorPolicyCapability::CAN_EDIT,
+        ))
+      ->withIDs(array($repository->getID()))
+      ->executeOne();
+
+    if (!$repository) {
+      return new Aphront404Response();
+    }
+
+    $edit_uri = $this->getRepositoryControllerURI($repository, 'edit/');
+
+    $v_encoding = $repository->getDetail('encoding');
+    $e_encoding = null;
+    $errors = array();
+
+    if ($request->isFormPost()) {
+      $v_encoding = $request->getStr('encoding');
+
+      if (!$errors) {
+        $xactions = array();
+        $template = id(new PhabricatorRepositoryTransaction());
+
+        $type_encoding = PhabricatorRepositoryTransaction::TYPE_ENCODING;
+
+        $xactions[] = id(clone $template)
+          ->setTransactionType($type_encoding)
+          ->setNewValue($v_encoding);
+
+        try {
+          id(new PhabricatorRepositoryEditor())
+            ->setContinueOnNoEffect(true)
+            ->setContentSourceFromRequest($request)
+            ->setActor($user)
+            ->applyTransactions($repository, $xactions);
+
+          return id(new AphrontRedirectResponse())->setURI($edit_uri);
+        } catch (Exception $ex) {
+          $errors[] = $ex->getMessage();
+        }
+      }
+    }
+
+    $content = array();
+
+    $crumbs = $this->buildCrumbs();
+    $crumbs->addCrumb(
+      id(new PhabricatorCrumbView())
+        ->setName(pht('Edit Encoding')));
+    $content[] = $crumbs;
+
+    $title = pht('Edit %s', $repository->getName());
+
+    if ($errors) {
+      $content[] = id(new AphrontErrorView())
+        ->setTitle(pht('Form Errors'))
+        ->setErrors($errors);
+    }
+
+    $form = id(new AphrontFormView())
+      ->setUser($user)
+      ->setFlexible(true)
+      ->appendRemarkupInstructions($this->getEncodingInstructions())
+      ->appendChild(
+        id(new AphrontFormTextControl())
+          ->setName('encoding')
+          ->setLabel(pht('Text Encoding'))
+          ->setValue($v_encoding)
+          ->setError($e_encoding))
+      ->appendChild(
+        id(new AphrontFormSubmitControl())
+          ->setValue(pht('Save Encoding'))
+          ->addCancelButton($edit_uri));
+
+    $content[] = $form;
+
+    return $this->buildApplicationPage(
+      $content,
+      array(
+        'title' => $title,
+        'dust' => true,
+        'device' => true,
+      ));
+  }
+
+  private function getEncodingInstructions() {
+    return pht(<<<EOT
+If source code in this repository uses a character encoding other than UTF-8
+(for example, `ISO-8859-1`), specify it here.
+
+**Normally, you can leave this field blank.** If your source code is written in
+ASCII or UTF-8, everything will work correctly.
+
+Source files will be translated from the specified encoding to UTF-8 when they
+are read from the repository, before they are displayed in Diffusion.
+
+See [[%s | UTF-8 and Character Encoding]] for more information on how
+Phabricator handles text encodings.
+EOT
+    ,
+    PhabricatorEnv::getDoclink(
+      'article/User_Guide_UTF-8_and_Character_Encoding.html'));
+  }
+
+}