text: import argparse
  from pathlib import Path
  
  from dvc.command import completion
  from dvc.command.base import CmdBase, fix_subparsers
  from dvc.render.utils import match_renderers
  from dvc.ui import ui
  
  
  class CmdLive(CmdBase):
      UNINITIALIZED = True
  
      def _run(self, target, revs=None):
          metrics, plots = self.repo.live.show(target=target, revs=revs)
  
          if plots:
              html_path = Path.cwd() / (self.args.target + "_html")
              from dvc.render.utils import render
  
              renderers = match_renderers(plots, self.repo.plots.templates)
              index_path = render(self.repo, renderers, metrics, html_path)
              ui.write(index_path.as_uri())
              return 0
          return 1
  
  
  class CmdLiveShow(CmdLive):
      def run(self):
          return self._run(self.args.target)
  
  
  class CmdLiveDiff(CmdLive):
      def run(self):
          return self._run(self.args.target, self.args.revs)
  
  
  def shared_parent_parser():
      parent_parser = argparse.ArgumentParser(add_help=False)
      parent_parser.add_argument(
          "target", help="Logs dir to produce summary from"
      ).complete = completion.DIR
      parent_parser.add_argument(
          "-o",
          "--out",
          default=None,
          help="Destination path to save plots to",
          metavar="<path>",
      ).complete = completion.DIR
      return parent_parser
  
  
  def add_parser(subparsers, parent_parser):
      LIVE_DESCRIPTION = (
          "Commands to visualize and compare dvclive-produced logs."
      )
      live_parser = subparsers.add_parser(
          "live",
          parents=[parent_parser],
          formatter_class=argparse.RawDescriptionHelpFormatter,
          description=LIVE_DESCRIPTION,
      )
      live_subparsers = live_parser.add_subparsers(
          dest="cmd",
          help="Use `dvc live CMD --help` to display command-specific help.",
      )
  
      fix_subparsers(live_subparsers)
  
      SHOW_HELP = "Visualize dvclive directory content."
      live_show_parser = live_subparsers.add_parser(
          "show",
          parents=[parent_parser, shared_parent_parser()],
          help=SHOW_HELP,
          formatter_class=argparse.RawDescriptionHelpFormatter,
      )
      live_show_parser.set_defaults(func=CmdLiveShow)
  
      DIFF_HELP = (
          "Show multiple versions of dvclive data, "
          "by plotting it in single view."
      )
      live_diff_parser = live_subparsers.add_parser(
          "diff",
          parents=[parent_parser, shared_parent_parser()],
          help=DIFF_HELP,
          formatter_class=argparse.RawDescriptionHelpFormatter,
      )
      live_diff_parser.add_argument(
          "--revs",
          nargs="*",
          default=None,
          help="Git revision (e.g. SHA, branch, tag)",
          metavar="<commit>",
      )
      live_diff_parser.set_defaults(func=CmdLiveDiff)
  