Allow Phabricator to parse bare revision IDs from "Differential Revision:" fields

Summary: Fixes T8087. Depends on D12748.

Test Plan: See D12748.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: cburroughs, epriestley

Maniphest Tasks: T8087

Differential Revision: https://secure.phabricator.com/D12749

src/applications/differential/customfield/DifferentialRevisionIDField.php

@@ -32,6 +32,14 @@ final class DifferentialRevisionIDField
   }
 
   public function parseValueFromCommitMessage($value) {
+    // If the value is just "D123" or similar, parse the ID from it directly.
+    $value = trim($value);
+    $matches = null;
+    if (preg_match('/^[dD]([1-9]\d*)\z/', $value, $matches)) {
+      return (int)$matches[1];
+    }
+
+    // Otherwise, try to extract a URI value.
     return self::parseRevisionIDFromURI($value);
   }