Diffusion - move DiffQuery to Conduit

Summary: title does not say it all; also added conduit wrappers for rawdiffquery and lastmodifiedquery. These get the wrapper treatment since they are used in daemons. Ref T2784.

Test Plan: for each of the 3 VCS, did the following: 1) loaded up CALLSIGN and verified 'Modified' column data showed up correctly in Browse Repository box. 2) loaded up the "change" view for a specific file and verified content showed up correctly. 3) loaded up a specific commit and noted the changes ajax loaded A-OK

Reviewers: epriestley

Reviewed By: epriestley

CC: chad, aran, Korvin

Maniphest Tasks: T2784

Differential Revision: https://secure.phabricator.com/D5896

src/applications/diffusion/conduit/ConduitAPI_diffusion_rawdiffquery_Method.php

@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * @group conduit
+ */
+final class ConduitAPI_diffusion_rawdiffquery_Method
+  extends ConduitAPI_diffusion_abstractquery_Method {
+
+  public function getMethodDescription() {
+    return
+      'Get raw diff information from a repository for a specific commit at an '.
+      '(optional) path.';
+  }
+
+  public function defineReturnType() {
+    return 'string';
+  }
+
+  protected function defineCustomParamTypes() {
+    return array(
+      'commit' => 'required string',
+      'path' => 'optional string',
+      'timeout' => 'optional int',
+      'linesOfContext' => 'optional int',
+      'againstCommit' => 'optional string',
+    );
+  }
+
+  protected function getResult(ConduitAPIRequest $request) {
+    $drequest = $this->getDiffusionRequest();
+    $timeout = $request->getValue('timeout');
+    $lines_of_context = $request->getValue('linesOfContext');
+    $against_commit = $request->getValue('againstCommit');
+
+    $raw_query = DiffusionRawDiffQuery::newFromDiffusionRequest($drequest);
+    if ($timeout !== null) {
+      $raw_query->setTimeout($timeout);
+    }
+    if ($lines_of_context !== null) {
+      $raw_query->setLinesOfContext($lines_of_context);
+    }
+    if ($against_commit !== null) {
+      $raw_query->setAgainstCommit($against_commit);
+    }
+    return $raw_query->loadRawDiff();
+  }
+}