content: from __future__ import annotations
  
  import argparse
  import asyncio
  import os
  import sys
  from typing import Generator
  
  from .asyncio.client import ClientConnection, connect
  from .asyncio.messages import SimpleQueue
  from .exceptions import ConnectionClosed
  from .frames import Close
  from .streams import StreamReader
  from .version import version as websockets_version
  
  
  __all__ = ["main"]
  
  
  def print_during_input(string: str) -> None:
      sys.stdout.write(
          # Save cursor position
          "\N{ESC}7"
          # Add a new line
          "\N{LINE FEED}"
          # Move cursor up
          "\N{ESC}[A"
          # Insert blank line, scroll last line down
          "\N{ESC}[L"
          # Print string in the inserted blank line
          f"{string}\N{LINE FEED}"
          # Restore cursor position
          "\N{ESC}8"
          # Move cursor down
          "\N{ESC}[B"
      )
      sys.stdout.flush()
  
  
  def print_over_input(string: str) -> None:
      sys.stdout.write(
          # Move cursor to beginning of line
          "\N{CARRIAGE RETURN}"
          # Delete current line
          "\N{ESC}[K"
          # Print string
          f"{string}\N{LINE FEED}"
      )
      sys.stdout.flush()
  
  
  class ReadLines(asyncio.Protocol):
      def __init__(self) -> None:
          self.reader = StreamReader()
          self.messages: SimpleQueue[str] = SimpleQueue()
  
      def parse(self) -> Generator[None, None, None]:
          while True:
              sys.stdout.write("> ")
              sys.stdout.flush()
              line = yield from self.reader.read_line(sys.maxsize)
              self.messages.put(line.decode().rstrip("\r\n"))
  
      def connection_made(self, transport: asyncio.BaseTransport) -> None:
          self.parser = self.parse()
          next(self.parser)
  
      def data_received(self, data: bytes) -> None:
          self.reader.feed_data(data)
          next(self.parser)
  
      def eof_received(self) -> None:
          self.reader.feed_eof()
          # next(self.parser) isn't useful and would raise EOFError.
  
      def connection_lost(self, exc: Exception | None) -> None:
          self.reader.discard()
          self.messages.abort()
  
  
  async def print_incoming_messages(websocket: ClientConnection) -> None:
      async for message in websocket:
          if isinstance(message, str):
              print_during_input("< " + message)
          else:
              print_during_input("< (binary) " + message.hex())
  
  
  async def send_outgoing_messages(
      websocket: ClientConnection,
      messages: SimpleQueue[str],
  ) -> None:
      while True:
          try:
              message = await messages.get()
          except EOFError:
              break
          try:
              await websocket.send(message)
          except ConnectionClosed:  # pragma: no cover
              break
  
  
  async def interactive_client(uri: str) -> None:
      try:
          websocket = await connect(uri)
      except Exception as exc:
          print(f"Failed to connect to {uri}: {exc}.")
          sys.exit(1)
      else:
          print(f"Connected to {uri}.")
  
      loop = asyncio.get_running_loop()
      transport, protocol = await loop.connect_read_pipe(ReadLines, sys.stdin)
      incoming = asyncio.create_task(
          print_incoming_messages(websocket),
      )
      outgoing = asyncio.create_task(
          send_outgoing_messages(websocket, protocol.messages),
      )
      try:
          await asyncio.wait(
              [incoming, outgoing],
              # Clean up and exit when the server closes the connection
              # or the user enters EOT (^D), whichever happens first.
              return_when=asyncio.FIRST_COMPLETED,
          )
      # asyncio.run() cancels the main task when the user triggers SIGINT (^C).
      # https://docs.python.org/3/library/asyncio-runner.html#handling-keyboard-interruption
      # Clean up and exit without re-raising CancelledError to prevent Python
      # from raising KeyboardInterrupt and displaying a stack track.
      except asyncio.CancelledError:  # pragma: no cover
          pass
      finally:
          incoming.cancel()
          outgoing.cancel()
          transport.close()
  
      await websocket.close()
      assert websocket.close_code is not None and websocket.close_reason is not None
      close_status = Close(websocket.close_code, websocket.close_reason)
      print_over_input(f"Connection closed: {close_status}.")
  
  
  def main(argv: list[str] | None = None) -> None:
      parser = argparse.ArgumentParser(
          prog="websockets",
          description="Interactive WebSocket client.",
          add_help=False,
      )
      group = parser.add_mutually_exclusive_group()
      group.add_argument("--version", action="store_true")
      group.add_argument("uri", metavar="<uri>", nargs="?")
      args = parser.parse_args(argv)
  
      if args.version:
          print(f"websockets {websockets_version}")
          return
  
      if args.uri is None:
          parser.print_usage()
          sys.exit(2)
  
      # Enable VT100 to support ANSI escape codes in Command Prompt on Windows.
      # See https://github.com/python/cpython/issues/74261 for why this works.
      if sys.platform == "win32":
          os.system("")
  
      try:
          import readline  # noqa: F401
      except ImportError:  # readline isn't available on all platforms
          pass
  
      # Remove the try/except block when dropping Python < 3.11.
      try:
          asyncio.run(interactive_client(args.uri))
      except KeyboardInterrupt:  # pragma: no cover
          pass
  