Depot tools: use the clang-format binaries that are now included

clang_format.py

Index: clang_format.py
diff --git a/clang_format.py b/clang_format.py
new file mode 100755
index 0000000000000000000000000000000000000000..27539f86da08e0a37a2cde8e6638340797b6b608
--- /dev/null
+++ b/clang_format.py
@@ -0,0 +1,90 @@
+#!/usr/bin/env python
+# Copyright 2014 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.
+
+"""Redirects to the version of clang-format checked into the Chrome tree.
+
+clang-format binaries are pulled down from Google Cloud Storage whenever you
+sync Chrome, to platform-specific locations. This script knows how to locate
+those tools, assuming the script is invoked from inside a Chromium checkout."""
+
+import gclient_utils
+import os
+import subprocess
+import sys
+
+
+class NotFoundError(Exception):
+  """A file could not be found."""
+  def __init__(self, e):
+    Exception.__init__(self,
+        'Problem while looking for clang-format in Chromium source tree:\n'
+        '  %s' % e)
+
+
+def _FindChromiumTree():
+  """Return the root of the current chromium checkout, or die trying."""
+  source_root = gclient_utils.FindFileUpwards('.gclient')
+  if not source_root:
+    raise NotFoundError(
+        '.gclient file not found in any parent of the current path.')
+  return source_root
+
+
+def FindClangFormatToolInChromiumTree():
+  """Return a path to the clang-format executable, or die trying."""
+  # The binaries in platform-specific subdirectories in src/tools/gn/bin.
+  tool_path = os.path.join(_FindChromiumTree(), 'src', 'third_party',
+                           'clang_format', 'bin',
+                           gclient_utils.GetMacWinOrLinux(),
+                           'clang-format' + gclient_utils.GetExeSuffix())
+  if not os.path.exists(tool_path):
+    # TODO(nick): After March 2014, eliminate the following advisory.
+    error_text = '''\n  GIT CL FORMAT - WINTER WEATHER ADVISORY
+
+    clang-format binaries now come with every Chrome checkout!
+
+    Unfortunately, your depot_tools scripts tried to find clang-format binaries
+    in your Chrome checkout, but failed. This is expected if you haven't synced
+    since the binaries were added.
+
+    'git cl format' will probably not work until you sync your Chrome tree.
+    Sorry about that.
+
+    Contact nick@chromium.org if you have any additional questions.\n\n'''
+
+    error_text += 'File does not exist: %s' % tool_path
+
+    raise NotFoundError(error_text)
+  return tool_path
+
+
+def FindClangFormatScriptInChromiumTree(script_name):
+  """Return a path to a clang-format helper script, or die trying."""
+  # The binaries in platform-specific subdirectories in src/tools/gn/bin.
+  script_path = os.path.join(_FindChromiumTree(), 'src', 'third_party',
+                             'clang_format', 'scripts', script_name)
+  if not os.path.exists(script_path):
+    raise NotFoundError('File does not exist: %s' % script_path)
+  return script_path
+
+
+def main(args):
+  try:
+    tool = FindClangFormatToolInChromiumTree()
+  except NotFoundError, e:
+    print >> sys.stderr, e
+    sys.exit(1)
+
+  # Add some visibility to --help showing where the tool lives, since this
+  # redirection can be a little opaque.
+  help_syntax = ('-h', '--help', '-help', '-help-list', '--help-list')
+  if any(match in args for match in help_syntax):
+    print '\nDepot tools redirects you to the clang-format at:\n    %s\n' % tool
+
+  return subprocess.call([tool] + sys.argv[1:])
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))