1 files changed, 61 insertions, 0 deletions
diff --git a/includes/specials/SpecialDiff.php b/includes/specials/SpecialDiff.php
new file mode 100644
index 00000000..77d23173
--- /dev/null
+++ b/includes/specials/SpecialDiff.php
@@ -0,0 +1,61 @@
+<?php
+/**
+ * Redirect from Special:Diff/### to index.php?diff=### and
+ * from Special:Diff/###/### to index.php?oldid=###&diff=###.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup SpecialPage
+ */
+
+/**
+ * Redirect from Special:Diff/### to index.php?diff=### and
+ * from Special:Diff/###/### to index.php?oldid=###&diff=###.
+ *
+ * All of the following are valid usages:
+ * - [[Special:Diff/12345]] (diff of a revision with the previous one)
+ * - [[Special:Diff/12345/prev]] (diff of a revision with the previous one as well)
+ * - [[Special:Diff/12345/next]] (diff of a revision with the next one)
+ * - [[Special:Diff/12345/cur]] (diff of a revision with the latest one of that page)
+ * - [[Special:Diff/12345/98765]] (diff between arbitrary two revisions)
+ *
+ * @ingroup SpecialPage
+ * @since 1.23
+ */
+class SpecialDiff extends RedirectSpecialPage {
+	function __construct() {
+		parent::__construct( 'Diff' );
+		$this->mAllowedRedirectParams = array();
+	}
+
+	function getRedirect( $subpage ) {
+		$parts = explode( '/', $subpage );
+
+		// Try to parse the values given, generating somewhat pretty URLs if possible
+		if ( count( $parts ) === 1 && $parts[0] !== '' ) {
+			$this->mAddedRedirectParams['diff'] = $parts[0];
+		} elseif ( count( $parts ) === 2 ) {
+			$this->mAddedRedirectParams['oldid'] = $parts[0];
+			$this->mAddedRedirectParams['diff'] = $parts[1];
+		} else {
+			// Wrong number of parameters, bail out
+			throw new ErrorPageError( 'nopagetitle', 'nopagetext' );
+		}
+
+		return true;
+	}
+}