Add script to find unused WPT results.

etc/unused_wpt_results.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+
+# Copyright 2019 The Servo Project Developers. See the COPYRIGHT
+# file at the top-level directory of this distribution.
+#
+# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+# option. This file may not be copied, modified, or distributed
+# except according to those terms.
+
+# For all directories and ini files under the WPT metadata directory,
+# check whether there is a match directory/test file in the vendored WPT
+# test collection. If there is not, the test result file is leftover since
+# the original test was moved/renamed/deleted and no longer serves any
+# purpose.
+
+import os
+
+test_root = os.path.join('tests', 'wpt', 'web-platform-tests')
+meta_root = os.path.join('tests', 'wpt', 'metadata')
+
+missing_dirs = []
+
+for base_dir, dir_names, files in os.walk(meta_root):
+    # Skip recursing into any directories that were previously found to be missing.
+    if base_dir in missing_dirs:
+        # Skip processing any subdirectories of known missing directories.
+        missing_dirs += map(lambda x: os.path.join(base_dir, x), dir_names)
+        continue
+
+    for dir_name in dir_names:
+        meta_dir = os.path.join(base_dir, dir_name)
+
+        # Skip any known directories that are meta-metadata.
+        if dir_name == '.cache':
+            missing_dirs += [meta_dir]
+            continue
+
+        # Turn tests/wpt/metadata/foo into tests/wpt/web-platform-tests/foo.
+        test_dir = os.path.join(test_root, os.path.relpath(meta_dir, meta_root))
+        if not os.path.exists(test_dir):
+            missing_dirs += [meta_dir]
+            print(meta_dir)
+
+    for fname in files:
+        # Skip any known files that are meta-metadata.
+        if fname in ['__dir__.ini', 'MANIFEST.json', 'mozilla-sync']:
+            continue
+
+        # Turn tests/wpt/metadata/foo/bar.html.ini into tests/wpt/web-platform-tests/foo/bar.html.
+        test_dir = os.path.join(test_root, os.path.relpath(base_dir, meta_root))
+        test_file = os.path.join(test_dir, fname)
+        if not os.path.exists(os.path.splitext(test_file)[0]):
+            print(os.path.join(base_dir, fname))