# Copyright 2012 the V8 project authors. All rights reserved.
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# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
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#       copyright notice, this list of conditions and the following
#       disclaimer in the documentation and/or other materials provided
#       with the distribution.
#     * Neither the name of Google Inc. nor the names of its
#       contributors may be used to endorse or promote products derived
#       from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"""Top-level presubmit script for V8.

See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
for more details about the presubmit API built into gcl.
"""

def _V8PresubmitChecks(input_api, output_api):
  """Runs the V8 presubmit checks."""
  import sys
  sys.path.append(input_api.os_path.join(
        input_api.PresubmitLocalPath(), 'tools'))
  from presubmit import CppLintProcessor
  from presubmit import SourceProcessor

  results = []
  if not CppLintProcessor().Run(input_api.PresubmitLocalPath()):
    results.append(output_api.PresubmitError("C++ lint check failed"))
  if not SourceProcessor().Run(input_api.PresubmitLocalPath()):
    results.append(output_api.PresubmitError(
        "Copyright header, trailing whitespaces and two empty lines " \
        "between declarations check failed"))
  return results


def _CommonChecks(input_api, output_api):
  """Checks common to both upload and commit."""
  results = []
  results.extend(input_api.canned_checks.CheckOwners(
      input_api, output_api, source_file_filter=None))
  results.extend(_V8PresubmitChecks(input_api, output_api))
  return results


def _SkipTreeCheck(input_api, output_api):
  """Check the env var whether we want to skip tree check.
     Only skip if src/version.cc has been updated."""
  src_version = 'src/version.cc'
  FilterFile = lambda file: file.LocalPath() == src_version
  if not input_api.AffectedSourceFiles(
      lambda file: file.LocalPath() == src_version):
    return False
  return input_api.environ.get('PRESUBMIT_TREE_CHECK') == 'skip'


def _CheckChangeLogFlag(input_api, output_api):
  """Checks usage of LOG= flag in the commit message."""
  results = []
  if input_api.change.BUG and not 'LOG' in input_api.change.tags:
    results.append(output_api.PresubmitError(
        'An issue reference (BUG=) requires a change log flag (LOG=). '
        'Use LOG=Y for including this commit message in the change log. '
        'Use LOG=N or leave blank otherwise.'))
  return results


def CheckChangeOnUpload(input_api, output_api):
  results = []
  results.extend(_CommonChecks(input_api, output_api))
  results.extend(_CheckChangeLogFlag(input_api, output_api))
  return results


def CheckChangeOnCommit(input_api, output_api):
  results = []
  results.extend(_CommonChecks(input_api, output_api))
  results.extend(_CheckChangeLogFlag(input_api, output_api))
  results.extend(input_api.canned_checks.CheckChangeHasDescription(
      input_api, output_api))
  if not _SkipTreeCheck(input_api, output_api):
    results.extend(input_api.canned_checks.CheckTreeIsOpen(
        input_api, output_api,
        json_url='http://v8-status.appspot.com/current?format=json'))
  return results