41         old_revision: revision to compare against
58     def validate_revision(revision):  argument
60                                           revision + "^{commit}"], shell=False)
63     def _create_git_worktree(self, revision):  argument
64         """Make a separate worktree for revision.
67         if revision == "current":
71             print("Creating git worktree for", revision)
72             git_worktree_path = os.path.join(self.repo_path, "temp-" + revision)
75                  git_worktree_path, revision], cwd=self.repo_path,
89     def _gen_code_size_csv(self, revision, git_worktree_path):  argument
92         csv_fname = revision + ".csv"
93         if revision == "current":
96             print("Measuring code size for", revision)
116     def _get_code_size_for_rev(self, revision):  argument
117         """Generate code size csv file for the specified git revision."""
120         csv_fname = revision + ".csv"
121         if (revision != "current") and \
123             print("Code size csv file for", revision, "already exists.")
125             git_worktree_path = self._create_git_worktree(revision)
127             self._gen_code_size_csv(revision, git_worktree_path)
194         "-o", "--old-rev", type=str, help="old revision for comparison.",
199         help="new revision for comparison, default is the current work \