Provide repository API method for getting all files

Test Plan:
  print_r(iterator_to_array($api->getAllFiles())); // Under Git.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2038

Differential Revision: https://secure.phabricator.com/D3940

src/repository/api/ArcanistGitAPI.php

@@ -527,6 +527,12 @@ final class ArcanistGitAPI extends ArcanistRepositoryAPI {
     return $files;
   }
 
+  public function getAllFiles() {
+    $future = $this->buildLocalFuture(array('ls-files -z'));
+    return id(new LinesOfALargeExecFuture($future))
+      ->setDelimiter("\0");
+  }
+
   public function getBlame($path) {
     // TODO: 'git blame' supports --porcelain and we should probably use it.
     list($stdout) = $this->execxLocal(

src/repository/api/ArcanistMercurialAPI.php

@@ -245,6 +245,12 @@ final class ArcanistMercurialAPI extends ArcanistRepositoryAPI {
     return $this->localCommitInfo;
   }
 
+  public function getAllFiles() {
+    // TODO: Handle paths with newlines.
+    $future = $this->buildLocalFuture(array('manifest'));
+    return new LinesOfALargeExecFuture($future);
+  }
+
   public function getBlame($path) {
     list($stdout) = $this->execxLocal(
       'annotate -u -v -c --rev %s -- %s',

src/repository/api/ArcanistRepositoryAPI.php

@@ -148,6 +148,11 @@ abstract class ArcanistRepositoryAPI {
     }
   }
 
+  /**
+   * @return Traversable
+   */
+  abstract public function getAllFiles();
+
   abstract public function getBlame($path);
   abstract public function getWorkingCopyStatus();
   abstract public function getRawDiffText($path);

src/repository/api/ArcanistSubversionAPI.php

@@ -465,6 +465,22 @@ Index: {$path}
 EODIFF;
   }
 
+  public function getAllFiles() {
+    // TODO: Handle paths with newlines.
+    $future = $this->buildLocalFuture(array('list -R'));
+    return new PhutilCallbackFilterIterator(
+      new LinesOfALargeExecFuture($future),
+      array($this, 'filterFiles'));
+  }
+
+  public function filterFiles($path) {
+    // NOTE: SVN uses '/' also on Windows.
+    if ($path == '' || substr($path, -1) == '/') {
+      return null;
+    }
+    return $path;
+  }
+
   public function getBlame($path) {
     $blame = array();