code: def run(self):
      from dvc.exceptions import DvcException
  
      try:
          diff = self.repo.diff(
              self.args.a_rev, self.args.b_rev, self.args.targets
          )
          show_hash = self.args.show_hash
          hide_missing = self.args.b_rev or self.args.hide_missing
          if hide_missing:
              diff.pop("not in cache", None)
  
          for key, entries in diff.items():
              entries = sorted(
                  entries,
                  key=lambda entry: (
                      entry["path"]["old"]
                      if isinstance(entry["path"], dict)
                      else entry["path"]
                  ),
              )
              if not show_hash:
                  for entry in entries:
                      del entry["hash"]
              diff[key] = entries
  
          if self.args.json:
              ui.write_json(diff)
          elif self.args.markdown:
              _show_markdown(diff, show_hash, hide_missing)
          elif diff:
              self._show_diff(diff, hide_missing)
  
      except DvcException:
          logger.exception("failed to get diff")
          return 1
      return 0
  
file_path: dvc/dvc/commands/diff.py
imports: import os
  from dvc.cli import completion, formatter
  from dvc.cli.command import CmdBase
  from dvc.cli.utils import append_doc_link
  from dvc.log import logger
  from dvc.ui import ui
label_desc: Use image node_id 2 for calling the CmdDiff obj's underlying member method code with example usage: obj.run() and returns: int, int