[Findit] Factoring the gitiles (etc) stuff out into its own directory

appengine/findit/common/change_log.py

-# 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.
-
-class FileChangeInfo(object):
-  """Represents a file change (add/delete/modify/rename/copy/etc)."""
-  def __init__(self, change_type, old_path, new_path):
-    self.change_type = change_type
-    self.old_path = old_path
-    self.new_path = new_path
-
-  def ToDict(self):
-    return {
-        'change_type': self.change_type,
-        'old_path': self.old_path,
-        'new_path': self.new_path
-    }
-
-  @staticmethod
-  def FromDict(info):
-    return FileChangeInfo(
-        info['change_type'], info['old_path'], info['new_path'])
-
-
-class ChangeLog(object):
-  """Represents the change log of a revision."""
-
-  def __init__(self, author_name, author_email, author_time, committer_name,
-               committer_email, committer_time, revision, commit_position,
-               message, touched_files, commit_url, code_review_url=None,
-               reverted_revision=None):
-    self.author_name = author_name
-    self.author_email = author_email
-    self.author_time = author_time
-    self.committer_name = committer_name
-    self.committer_email = committer_email
-    self.committer_time = committer_time
-    self.revision = revision
-    self.commit_position = commit_position
-    self.touched_files = touched_files
-    self.message = message
-    self.commit_url = commit_url
-    self.code_review_url = code_review_url
-    self.reverted_revision = reverted_revision
-
-  def ToDict(self):
-    """Returns the change log as a JSON object."""
-    json_data = {
-      'author_name': self.author_name,
-      'author_email': self.author_email,
-      'author_time': self.author_time,
-      'committer_name': self.committer_name,
-      'committer_email': self.committer_email,
-      'committer_time': self.committer_time,
-      'revision': self.revision,
-      'commit_position': self.commit_position,
-      'touched_files': [],
-      'message': self.message,
-      'commit_url': self.commit_url,
-      'code_review_url': self.code_review_url,
-      'reverted_revision': self.reverted_revision,
-    }
-    for touched_file in self.touched_files:
-      json_data['touched_files'].append(touched_file.ToDict())
-    return json_data
-
-  @staticmethod
-  def FromDict(info):
-    """Returns a ChangeLog instance represented by the given JSON info."""
-    touched_files = []
-    for touched_file_info in info['touched_files']:
-      touched_files.append(FileChangeInfo.FromDict(touched_file_info))
-
-    return ChangeLog(
-        info['author_name'], info['author_email'], info['author_time'],
-        info['committer_name'], info['committer_email'], info['committer_time'],
-        info['revision'], info['commit_position'], info['message'],
-        touched_files, info['commit_url'], info['code_review_url'],
-        info['reverted_revision']
-    )