Move exportable_commits_since to webkitpy/w3c/common.py.

third_party/WebKit/Tools/Scripts/webkitpy/w3c/common.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/w3c/common.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/common.py b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/common.py
new file mode 100644
index 0000000000000000000000000000000000000000..9edd8dc441f1328c1a33b9916612b26459ccd5a2
--- /dev/null
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/common.py
@@ -0,0 +1,55 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Utility functions used both when importing and exporting."""
+
+import logging
+
+from webkitpy.w3c.chromium_commit import ChromiumCommit
+
+
+WPT_DEST_NAME = 'wpt'
+CSS_DEST_NAME = 'csswg-test'
+
+# TODO(qyearsley): This directory should be able to be constructed with
+# WebKitFinder and WPT_DEST_NAME, plus the string "external".
+CHROMIUM_WPT_DIR = 'third_party/WebKit/LayoutTests/external/wpt/'
+
+# Our mirrors of the official w3c repos, which we pull from.
+WPT_REPO_URL = 'https://chromium.googlesource.com/external/w3c/web-platform-tests.git'
+CSS_REPO_URL = 'https://chromium.googlesource.com/external/w3c/csswg-test.git'
+
+_log = logging.getLogger(__name__)
+
+
+def exportable_commits_since(commit, host, local_wpt):
+    """Lists exportable commits after a certain point.
+
+    Args:
+        commit: The SHA of the Chromium commit from which this method will look.
+        host: A Host object.
+        local_wpt: A LocalWPT instance, used to see whether a Chromium commit
+            can be applied cleanly in the upstream repo.
+
+    Returns:
+        A list of ChromiumCommit objects for commits that are exportable since
+        the given commit, in chronological order.
+    """
+    chromium_repo_root = host.executive.run_command(['git', 'rev-parse', '--show-toplevel']).strip()
+
+    wpt_path = chromium_repo_root + '/' + CHROMIUM_WPT_DIR
+    commit_hashes = host.executive.run_command(
+        ['git', 'rev-list', '{}..HEAD'.format(commit), '--reverse', '--', wpt_path]).splitlines()
+
+    chromium_commits = [ChromiumCommit(host, sha=sha) for sha in commit_hashes]
+    return [c for c in chromium_commits if is_exportable(c, local_wpt)]
+
+
+def is_exportable(chromium_commit, local_wpt):
+    """Checks whether a given patch is exportable and can be applied."""
+    patch = chromium_commit.format_patch()
+    return (patch and
+            local_wpt.test_patch(patch) and
+            'NOEXPORT=true' not in chromium_commit.message() and
+            not chromium_commit.message().startswith('Import '))