text: # Copyright 2018 The Bazel Authors. All rights reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #    http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  r"""Command line diffing tool that compares two bazel aquery invocations.
  
  This script compares the proto output of two bazel aquery invocations. For
  each set of output files of an action, it compares the command lines that
  generated the files.
  
  Example usage:
  bazel aquery //path/to:target_one --output=textproto > \
      /path/to/output_one.textproto
  bazel aquery //path/to:target_two --output=textproto > \
      /path/to/output_two.textproto
  
  From a bazel repo:
  bazel run //tools/aquery_differ:aquery_differ -- \
  --before=/path/to/output_one.textproto \
  --after=/path/to/output_two.textproto \
  --input_type=textproto \
  --attrs=cmdline \
  --attrs=inputs
  """
  
  from __future__ import print_function
  import difflib
  import os
  import sys
  from absl import app
  from absl import flags
  from google.protobuf import text_format
  from src.main.protobuf import analysis_pb2
  from tools.aquery_differ.resolvers.dep_set_resolver import DepSetResolver
  
  flags.DEFINE_string("before", None, "Aquery output before the change")
  flags.DEFINE_string("after", None, "Aquery output after the change")
  flags.DEFINE_enum(
      "input_type", "proto", ["proto", "textproto"],
      "The format of the aquery proto input. One of 'proto' and 'textproto.")
  flags.DEFINE_multi_enum("attrs", ["cmdline"], ["inputs", "cmdline"],
                          "Attributes of the actions to be compared.")
  flags.mark_flag_as_required("before")
  flags.mark_flag_as_required("after")
  
  WHITE = "\033[37m%s\033[0m"
  CYAN = "\033[36m%s\033[0m"
  RED = "\033[31m%s\033[0m"
  GREEN = "\033[32m%s\033[0m"
  
  
  def _colorize(line):
    """Add color to the input string."""
    if not sys.stdout.isatty():
      return line
  
    if line.startswith("+++") or line.startswith("---"):
      return WHITE % line
  
    if line.startswith("@@"):
      return CYAN % line
  
    if line.startswith("+"):
      return GREEN % line
  
    if line.startswith("-"):
      return RED % line
  
    return line
  
  
  def _print_diff(output_files, before_val, after_val, attr, before_file,
                  after_file):
    diff = "\n".join(
        map(_colorize, [
            s.strip("\n") for s in difflib.unified_diff(before_val, after_val,
                                                        before_file, after_file)
        ]))
    print(("[%s]\n"
           "Difference in the action that generates the following output(s):"
           "\n\t%s\n%s\n") % (attr, "\n\t".join(output_files.split()), diff))
  
  
  def _map_artifact_id_to_path(artifacts):
    return {artifact.id: artifact.exec_path for artifact in artifacts}
  
  
  def _map_action_index_to_output_files(actions, artifacts):
    """Constructs a map from action index to output files.
  
    Args:
      actions: a list of actions from the action graph container
      artifacts: a map {artifact_id: artifact path}
  
    Returns:
      A map from action index (in action graph container) to a string of
      concatenated output artifacts paths.
    """
    action_index_to_output_files = {}
    for i, action in enumerate(actions):
      output_files = " ".join(
          sorted([artifacts[output_id] for output_id in action.output_ids]))
      action_index_to_output_files[i] = output_files
    return action_index_to_output_files
  
  
  # output files -> input artifacts
  def _map_output_files_to_input_artifacts(
      action_graph_container, artifact_id_to_path, action_index_to_output_files):
    """Constructs a map from output files to input artifacts.
  
    Args:
      action_graph_container: the full action graph container object
      artifact_id_to_path: a map {artifact_id: artifact path}
      action_index_to_output_files: a map from action index (in action graph
        container) to a string of concatenated output artifacts paths.
  
    Returns:
      A map from output files (string of concatenated output artifacts paths) to a
      list of input artifacts.
    """
    actions = action_graph_container.actions
    dep_set_of_files = action_graph_container.dep_set_of_files
    id_to_dep_set = {dep_set.id: dep_set for dep_set in dep_set_of_files}
    dep_set_resolver = DepSetResolver(dep_set_of_files, artifact_id_to_path)
  
    output_files_to_input_artifacts = {}
    for i, action in enumerate(actions):
      input_artifacts = []
  
      for dep_set_id in action.input_dep_set_ids:
        input_artifacts.extend(
            dep_set_resolver.resolve(id_to_dep_set[dep_set_id]))
  
      output_files_to_input_artifacts[action_index_to_output_files[i]] = list(
          sorted(input_artifacts))
  
    return output_files_to_input_artifacts
  
  
  # output files -> command line
  def _map_output_files_to_command_line(actions, action_index_to_output_files):
    """Constructs a map from output files to command line.
  
    Args:
      actions: a list of actions from the action graph container
      action_index_to_output_files: a map from action index (in action graph
        container) to a string of concatenated output artifacts paths.
  
    Returns:
      A map from output files (string of concatenated output artifacts paths)
      to the command line (a list of arguments).
    """
    output_files_to_command_line = {}
    for i, action in enumerate(actions):
      output_files_to_command_line[
          action_index_to_output_files[i]] = action.arguments
    return output_files_to_command_line
  
  
  def _aquery_diff(before_proto, after_proto, attrs, before_file, after_file):
    """Returns differences between command lines that generate same outputs."""
    found_difference = False
    artifacts_before = _map_artifact_id_to_path(before_proto.artifacts)
    artifacts_after = _map_artifact_id_to_path(after_proto.artifacts)
  
    action_to_output_files_before = _map_action_index_to_output_files(
        before_proto.actions, artifacts_before)
    action_to_output_files_after = _map_action_index_to_output_files(
        after_proto.actions, artifacts_after)
  
    # There's a 1-to-1 mapping between action and outputs
    output_files_before = set(action_to_output_files_before.values())
    output_files_after = set(action_to_output_files_after.values())
  
    before_after_diff = output_files_before - output_files_after
    after_before_diff = output_files_after - output_files_before
  
    if before_after_diff:
      print(("Aquery output 'before' change contains an action that generates "
             "the following outputs that aquery output 'after' change doesn't:"
             "\n%s\n") % "\n".join(before_after_diff))
      found_difference = True
    if after_before_diff:
      print(("Aquery output 'after' change contains an action that generates "
             "the following outputs that aquery output 'before' change doesn't:"
             "\n%s\n") % "\n".join(after_before_diff))
      found_difference = True
  
    if "cmdline" in attrs:
      output_to_command_line_before = _map_output_files_to_command_line(
          before_proto.actions, action_to_output_files_before)
      output_to_command_line_after = _map_output_files_to_command_line(
          after_proto.actions, action_to_output_files_after)
      for output_files in output_to_command_line_before:
        arguments = output_to_command_line_before[output_files]
        after_arguments = output_to_command_line_after.get(output_files, None)
        if after_arguments and arguments != after_arguments:
          _print_diff(output_files, arguments, after_arguments, "cmdline",
                      before_file, after_file)
          found_difference = True
  
    if "inputs" in attrs:
      output_to_input_files_before = _map_output_files_to_input_artifacts(
          before_proto, artifacts_before, action_to_output_files_before)
      output_to_input_files_after = _map_output_files_to_input_artifacts(
          after_proto, artifacts_after, action_to_output_files_after)
      for output_files in output_to_input_files_before:
        before_inputs = output_to_input_files_before[output_files]
        after_inputs = output_to_input_files_after.get(output_files, None)
        if after_inputs and before_inputs != after_inputs:
          _print_diff(output_files, before_inputs, after_inputs, "inputs",
                      before_file, after_file)
          found_difference = True
  
    if not found_difference:
      print("No difference")
  
  
  def to_absolute_path(path):
    path = os.path.expanduser(path)
    if os.path.isabs(path):
      return path
    else:
      if "BUILD_WORKING_DIRECTORY" in os.environ:
        return os.path.join(os.environ["BUILD_WORKING_DIRECTORY"], path)
      else:
        return path
  
  
  def main(unused_argv):
    before_file = to_absolute_path(flags.FLAGS.before)
    after_file = to_absolute_path(flags.FLAGS.after)
    input_type = flags.FLAGS.input_type
    attrs = flags.FLAGS.attrs
  
    before_proto = analysis_pb2.ActionGraphContainer()
    after_proto = analysis_pb2.ActionGraphContainer()
    if input_type == "proto":
      with open(before_file, "rb") as f:
        before_proto.ParseFromString(f.read())
      with open(after_file, "rb") as f:
        after_proto.ParseFromString(f.read())
    else:
      with open(before_file, "r") as f:
        before_text = f.read()
        text_format.Merge(before_text, before_proto)
      with open(after_file, "r") as f:
        after_text = f.read()
        text_format.Merge(after_text, after_proto)
  
    _aquery_diff(before_proto, after_proto, attrs, before_file, after_file)
  
  
  if __name__ == "__main__":
    app.run(main)
  