text: import os
  import threading
  import queue
  from typing import List, Tuple, Union
  import dataclasses
  from ..utils.providers import Provider
  from ..utils import datanodes as dn
  from ..utils import config as cfg
  from ..utils import markups as mu
  from ..utils import commands as cmd
  from ..devices import engines
  from . import beatwidgets
  from . import beatinputs
  
  
  # widgets
  @dataclasses.dataclass
  class PatternsWidgetSettings:
      r"""
      Fields
      ------
      patterns : list of str
          The patterns to loop.
      """
      patterns: List[str] = dataclasses.field(
          default_factory=lambda: [
              "[color=cyan]⠶⠦⣚⠀⠶[/]",
              "[color=cyan]⢎⣀⡛⠀⠶[/]",
              "[color=cyan]⢖⣄⠻⠀⠶[/]",
              "[color=cyan]⠖⠐⡩⠂⠶[/]",
              "[color=cyan]⠶⠀⡭⠲⠶[/]",
              "[color=cyan]⠶⠀⣬⠉⡱[/]",
              "[color=cyan]⠶⠀⣦⠙⠵[/]",
              "[color=cyan]⠶⠠⣊⠄⠴[/]",
          ]
      )
  
  
  class PatternsWidget:
      def __init__(self, settings):
          self.settings = settings
  
      def load(self, provider):
          rich = provider.get(mu.RichParser)
          metronome = provider.get(engines.Metronome)
  
          patterns = self.settings.patterns
  
          markuped_patterns = [rich.parse(pattern) for pattern in patterns]
  
          def patterns_func(arg):
              time, ran = arg
              beat = metronome.beat(time)
              ind = int(beat * len(markuped_patterns) // 1) % len(markuped_patterns)
              res = markuped_patterns[ind]
              return [(0, res)]
  
          return patterns_func
  
  
  @dataclasses.dataclass
  class MarkerWidgetSettings:
      r"""
      Fields
      ------
      normal_appearance : str
          The appearance of normal-style markers.
      blinking_appearance : str
          The appearance of blinking-style markers.
      blink_ratio : float
          The ratio to blink.
      """
      normal_appearance: str = "❯ "
      blinking_appearance: str = "[weight=bold]❯ [/]"
      blink_ratio: float = 0.3
  
  
  class MarkerWidget:
      def __init__(self, settings):
          self.settings = settings
  
      def load(self, provider):
          rich = provider.get(mu.RichParser)
          metronome = provider.get(engines.Metronome)
  
          blink_ratio = self.settings.blink_ratio
          normal = [(0, rich.parse(self.settings.normal_appearance))]
          blinking = [(0, rich.parse(self.settings.blinking_appearance))]
  
          def marker_func(arg):
              time, ran = arg
              beat = metronome.beat(time)
              if beat % 4 < min(1.0, blink_ratio):
                  return blinking
              else:
                  return normal
  
          return marker_func
  
  
  class BeatshellWidgetFactory:
      monitor = beatwidgets.MonitorWidgetSettings
      patterns = PatternsWidgetSettings
      marker = MarkerWidgetSettings
  
      def __init__(self, rich, renderer, metronome):
          self.provider = Provider()
          self.provider.set(rich)
          self.provider.set(renderer)
          self.provider.set(metronome)
  
      def create(self, widget_settings):
          if isinstance(widget_settings, BeatshellWidgetFactory.monitor):
              return beatwidgets.MonitorWidget(widget_settings).load(self.provider)
          elif isinstance(widget_settings, BeatshellWidgetFactory.patterns):
              return PatternsWidget(widget_settings).load(self.provider)
          elif isinstance(widget_settings, BeatshellWidgetFactory.marker):
              return MarkerWidget(widget_settings).load(self.provider)
          else:
              raise TypeError
  
  
  BeatshellIconWidgetSettings = Union[
      PatternsWidgetSettings, beatwidgets.MonitorWidgetSettings,
  ]
  
  
  # prompt
  class BeatShellSettings(cfg.Configurable):
      r"""
      Fields
      ------
      debug_monitor : bool
          Whether to monitor renderer.
      """
  
      debug_monitor: bool = False
  
      input = cfg.subconfig(beatinputs.BeatInputSettings)
  
      @cfg.subconfig
      class prompt(cfg.Configurable):
          r"""
          Fields
          ------
          t0 : float
          tempo : float
  
          icon_width : int
              The text width of icon.
          marker_width : int
              The text width of marker.
  
          icons : BeatShellIconWidgetSettings
              The appearances of icon.
          marker : MarkerWidgetSettings
              The appearance of marker.
          """
          t0: float = 0.0
          tempo: float = 130.0
  
          icon_width: int = 5
          marker_width: int = 2
  
          icons: BeatshellIconWidgetSettings = PatternsWidgetSettings()
          marker: MarkerWidgetSettings = MarkerWidgetSettings()
  
          @cfg.subconfig
          class textbox(cfg.Configurable, beatwidgets.TextBoxWidgetSettings):
              __doc__ = beatwidgets.TextBoxWidgetSettings.__doc__
  
              def __init__(self):
                  pass
  
      @cfg.subconfig
      class banner(cfg.Configurable):
          r"""
          Fields
          ------
          banner : str
              The template of banner with slots: `user`, `profile`, `path`.
  
          user : str
              The template of user with slots: `user_name`.
          profile : tuple of str and str
              The templates of profile with slots: `profile_name`, the second is
              for changed profile.
          path : tuple of str and str
              The templates of path with slots: `current_path`, the second is for
              unknown path.
  
          unprintable_character : str
              The placeholder for unprintable character.
          """
  
          banner: str = (
              "[color=bright_black][[[/]"
              "[slot=user/]"
              "[color=bright_black]/[/]"
              "[slot=profile/]"
              "[color=bright_black]]][/]"
              " [slot=path/]"
          )
          user: str = "[color=magenta]♜ [weight=bold][slot=user_name/][/][/]"
          profile: Tuple[str, str] = (
              "[color=blue]⚙ [weight=bold][slot=profile_name/][/][/]",
              "[color=blue]⚙ [weight=bold][slot=profile_name/][/][/]*",
          )
          path: Tuple[str, str] = (
              "[color=cyan]⛩ [weight=bold][slot=current_path/][/][/]",
              "[color=cyan]⛩ [weight=dim][slot=current_path/][/][/]",
          )
  
          unprintable_character: str = "⍰"
  
      @cfg.subconfig
      class text(cfg.Configurable):
          r"""
          Fields
          ------
          typeahead : str
              The markup template for the type-ahead.
          highlight : str
              The markup template for the highlighted token.
  
          desc_message : str
              The markup template for the desc message.
          info_message : str
              The markup template for the info message.
          message_max_lines : int
              The maximum number of lines of the message.
          message_overflow_ellipsis : str
              Texts to display when overflowing.
  
          suggestions_lines : int
              The maximum number of lines of the suggestions.
          suggestion_items : tuple of str and str
              The markup templates for the unselected/selected suggestion.
          suggestion_overflow_ellipses : tuple of str and str
              Texts to display when overflowing top/bottom.
          """
          typeahead: str = "[weight=dim][slot/][/]"
          highlight: str = "[underline][slot/][/]"
  
          desc_message: str = "[weight=dim][slot/][/]"
          info_message: str = f"{'─'*80}\n[slot/]\n{'─'*80}"
          message_max_lines: int = 16
          message_overflow_ellipsis: str = "[weight=dim]…[/]"
  
          suggestions_lines: int = 8
          suggestion_items: Tuple[str, str] = ("• [slot/]", "• [invert][slot/][/]")
          suggestion_overflow_ellipses: Tuple[str, str] = ("[weight=dim]ⵗ[/]", "[weight=dim]ⵗ[/]")
  
  
  class PromptError(Exception):
      def __init__(self, cause):
          self.cause = cause
  
  
  class BeatPrompt:
      r"""Prompt renderer for beatshell."""
  
      monitor_file_path = "monitor/prompt.csv"
  
      def __init__(
          self,
          rich,
          cache_dir,
          command_parser_getter,
          settings_getter,
          preview_handler,
      ):
          self.rich = rich
          self._settings_getter = settings_getter
          self.cache_dir = cache_dir
  
          self.input = beatinputs.BeatInput(
              command_parser_getter,
              preview_handler,
              rich,
              cache_dir,
              lambda: self.settings.input,
          )
  
      @property
      def settings(self):
          return self._settings_getter()
  
      def register(self, renderer, fin_event):
          # widgets
          settings = self.settings
          t0 = settings.prompt.t0
          tempo = settings.prompt.tempo
          metronome = engines.Metronome(t0, tempo)
  
          widget_factory = BeatshellWidgetFactory(self.rich, renderer, metronome)
  
          icon = widget_factory.create(settings.prompt.icons)
          marker = widget_factory.create(settings.prompt.marker)
  
          state = InputView(self.input)
          text_renderer = TextRenderer(self.rich, settings.text)
          msg_renderer = MsgRenderer(self.rich, settings.text)
  
          textbox = beatwidgets.TextBox(
              lambda: text_renderer.render_text(state),
              settings.prompt.textbox,
          ).load(widget_factory.provider)
  
          # layout
          icon_width = settings.prompt.icon_width
          marker_width = settings.prompt.marker_width
  
          [
              icon_mask,
              marker_mask,
              input_mask,
          ] = beatwidgets.layout([icon_width, marker_width, -1])
  
          # register
          renderer.add_drawer(state.load(fin_event), zindex=())
          renderer.add_texts(icon, icon_mask, zindex=(2,))
          renderer.add_texts(marker, marker_mask, zindex=(3,))
          renderer.add_texts(textbox, input_mask, zindex=(0,))
          renderer.add_drawer(msg_renderer.render_msg(state), zindex=(1,))
  
      @dn.datanode
      def prompt(self, devices_settings):
          fin_event = threading.Event()
  
          # engines
          settings = self.settings
          debug_monitor = settings.debug_monitor
          renderer_monitor = (
              engines.Monitor(self.cache_dir / self.monitor_file_path)
              if debug_monitor
              else None
          )
          input_task, controller = engines.Controller.create(
              devices_settings.controller, devices_settings.terminal
          )
          display_task, renderer = engines.Renderer.create(
              devices_settings.renderer,
              devices_settings.terminal,
              monitor=renderer_monitor,
          )
  
          # handlers
          self.register(renderer, fin_event)
          self.input._register(controller)
  
          @dn.datanode
          def stop_when(event):
              yield
              yield
              while not event.is_set():
                  yield
  
          yield from dn.pipe(stop_when(fin_event), display_task, input_task).join()
  
          result = self.input.result
          if isinstance(result, beatinputs.ErrorResult):
              raise PromptError(result.error)
          elif isinstance(result, beatinputs.CompleteResult):
              return result.command
          else:
              raise TypeError
  
      def new_session(self, clear=True):
          return self.input.new_session(clear=clear)
  
      def record_command(self):
          return self.input._record_command()
  
      def make_banner(self, file_manager, profile_manager):
          banner_settings = self.settings.banner
  
          username = file_manager.username
          current_name = profile_manager.current_name
          path = str(file_manager.current)
          if path == ".":
              path = ""
          path = os.path.join("$" + file_manager.ROOT_ENVVAR, path, "")
          profile_is_changed = profile_manager.is_changed()
          path_is_known = file_manager.glob(file_manager.root / file_manager.current)[2] is not None
  
          unpr = banner_settings.unprintable_character
          username = mu.Text("".join(ch if ch.isprintable() else unpr for ch in username))
          profile = mu.Text("".join(ch if ch.isprintable() else unpr for ch in current_name))
          path = mu.Text("".join(ch if ch.isprintable() else unpr for ch in path))
  
          user_markup = banner_settings.user
          user_markup = self.rich.parse(user_markup, slotted=True)
          user_markup = user_markup(user_name=username)
  
          profile_markup = banner_settings.profile
          profile_markup = profile_markup[0] if not profile_is_changed else profile_markup[1]
          profile_markup = self.rich.parse(profile_markup, slotted=True)
          profile_markup = profile_markup(profile_name=profile)
  
          path_markup = banner_settings.path
          path_markup = path_markup[0] if path_is_known else path_markup[1]
          path_markup = self.rich.parse(path_markup, slotted=True)
          path_markup = path_markup(current_path=path)
  
          banner_markup = banner_settings.banner
          banner_markup = self.rich.parse(banner_markup, slotted=True)
          banner_markup = banner_markup(
              user=user_markup,
              profile=profile_markup,
              path=path_markup,
          )
  
          return banner_markup
  
  
  class InputView:
      def __init__(self, input):
          r"""Constructor.
  
          Parameters
          ----------
          input : BeatInput
          """
          self.input = input
  
          self.key_pressed = False
          self.buffer = []
          self.tokens = []
          self.pos = 0
          self.highlighted = None
          self.typeahead = ""
          self.clean = False
          self.hint = None
          self.popup = []
          self.suggestions = None
          self.state = "EDIT"
  
      @dn.datanode
      def load(self, fin_event):
          buffer_modified_counter = None
          key_pressed_counter = None
  
          res, time, width = yield
  
          while True:
              with self.input.edit_ctxt.lock:
                  if self.input.buffer_modified_counter != buffer_modified_counter:
                      buffer_modified_counter = self.input.buffer_modified_counter
                      self.buffer = list(self.input.text_buffer.buffer)
                      self.tokens = list(self.input.semantic_analyzer.tokens)
                  self.pos = self.input.text_buffer.pos
  
                  self.typeahead = self.input.typeahead
                  self.clean = self.input.result is not None
                  self.hint = self.input.hint_manager.get_hint()
                  self.suggestions = (
                      self.input.autocomplete_manager.get_suggestions_list(),
                      self.input.autocomplete_manager.get_suggestions_index(),
                  )
  
                  self.popup = []
                  while True:
                      try:
                          hint = self.input.hint_manager.popup_queue.get(False)
                      except queue.Empty:
                          break
                      self.popup.append(hint)
  
                  if isinstance(self.input.result, beatinputs.ErrorResult):
                      self.highlighted = self.input.result.index
                  else:
                      self.highlighted = self.input.hint_manager.get_hint_location()
  
                  self.state = self.input.state
  
                  self.key_pressed = self.input.key_pressed_counter != key_pressed_counter
                  key_pressed_counter = self.input.key_pressed_counter
  
              res, time, width = yield res
  
              # fin
              if self.state == "FIN" and not fin_event.is_set():
                  fin_event.set()
  
  
  @dataclasses.dataclass(frozen=True)
  class ByAddress:
      value: object
  
      def __eq__(self, other):
          if not isinstance(other, ByAddress):
              return False
          return self.value is other.value
  
  
  class TextRenderer:
      def __init__(self, rich, settings):
          self.rich = rich
          self.settings = settings
  
      @staticmethod
      def _render_grammar_key(buffer, tokens, typeahead, pos, highlighted, clean):
          return (
              ByAddress(buffer),
              typeahead,
              pos,
              highlighted,
              clean,
          )
  
      def render_grammar(
          self,
          buffer,
          tokens,
          typeahead,
          pos,
          highlighted,
          clean,
          caret_markup,
          typeahead_template,
          highlight_template,
      ):
          length = len(buffer)
          buffer = list(buffer)
  
          for token in tokens:
              # markup whitespace
              for index in range(token.mask.start, token.mask.stop):
                  if buffer[index] == " ":
                      buffer[index] = self.rich.tags["ws"]()
  
              # markup escape
              for index in token.quotes:
                  if buffer[index] == "'":
                      buffer[index] = self.rich.tags["qt"]()
                  elif buffer[index] == "\\":
                      buffer[index] = self.rich.tags["bs"]()
                  else:
                      assert False
  
          # markup caret, typeahead
          if clean:
              typeahead = ""
  
          if pos == length and not typeahead:
              buffer.append(" ")
  
          if not clean:
              if pos < len(buffer):
                  buffer[pos] = caret_markup(mu.join([buffer[pos]]).children)
              else:
                  typeahead = caret_markup(mu.join(typeahead[:1]).children), typeahead[1:]
  
          typeahead_markup = typeahead_template(mu.join(typeahead))
  
          res = []
          prev_index = 0
          for n, token in enumerate(tokens):
              # markup delimiter
              delimiter_markup = mu.join(buffer[prev_index : token.mask.start])
              res.append(delimiter_markup)
              prev_index = token.mask.stop
  
              # markup token
              token_markup = mu.join(buffer[token.mask])
              if token.type is None:
                  if clean or token.mask.stop != length:
                      token_markup = self.rich.tags["unk"](token_markup.children)
              elif token.type is cmd.TOKEN_TYPE.COMMAND:
                  token_markup = self.rich.tags["cmd"](token_markup.children)
              elif token.type is cmd.TOKEN_TYPE.KEYWORD:
                  token_markup = self.rich.tags["kw"](token_markup.children)
              elif token.type is cmd.TOKEN_TYPE.ARGUMENT:
                  token_markup = self.rich.tags["arg"](token_markup.children)
              else:
                  assert False
  
              # markup highlight
              if n == highlighted:
                  token_markup = highlight_template(token_markup)
  
              res.append(token_markup)
  
          else:
              delimiter_markup = mu.join(buffer[prev_index:])
              res.append(delimiter_markup)
  
          markup = mu.Group((*res, typeahead_markup))
          markup = markup.expand()
          return markup
  
      @dn.datanode
      def render_text(self, state):
          typeahead_template = self.rich.parse(self.settings.typeahead, slotted=True)
          highlight_template = self.rich.parse(self.settings.highlight, slotted=True)
  
          render_grammar = dn.starcachemap(
              self.render_grammar,
              key=self._render_grammar_key,
              caret_markup=beatwidgets.Caret,
              typeahead_template=typeahead_template,
              highlight_template=highlight_template,
          )
  
          with render_grammar:
              yield
              while True:
                  markup = render_grammar.send(
                      (
                          state.buffer,
                          state.tokens,
                          state.typeahead,
                          state.pos,
                          state.highlighted,
                          state.clean,
                      )
                  )
                  yield markup, state.key_pressed
  
  
  class MsgRenderer:
      def __init__(self, rich, settings):
          r"""Constructor.
  
          Parameters
          ----------
          rich : markups.RichParser
          settings : BeatShellSettings.text
          """
          self.rich = rich
          self.settings = settings
  
      @dn.datanode
      def render_msg(self, state):
          message_max_lines = self.settings.message_max_lines
          sugg_lines = self.settings.suggestions_lines
          sugg_items = self.settings.suggestion_items
  
          message_overflow_ellipsis = self.settings.message_overflow_ellipsis
          suggestion_overflow_ellipses = self.settings.suggestion_overflow_ellipses
  
          msg_ellipsis = self.rich.parse(message_overflow_ellipsis)
          msg_ellipsis_width = self.rich.widthof(msg_ellipsis)
  
          if msg_ellipsis_width == -1:
              raise ValueError(f"invalid ellipsis: {message_overflow_ellipsis!r}")
  
          sugg_top_ellipsis = self.rich.parse(suggestion_overflow_ellipses[0])
          sugg_top_ellipsis_width = self.rich.widthof(sugg_top_ellipsis)
          sugg_bottom_ellipsis = self.rich.parse(suggestion_overflow_ellipses[1])
          sugg_bottom_ellipsis_width = self.rich.widthof(sugg_bottom_ellipsis)
  
          if sugg_top_ellipsis_width == -1 or sugg_bottom_ellipsis_width == -1:
              raise ValueError(f"invalid ellipsis: {suggestion_overflow_ellipses!r}")
  
          sugg_items_templates = (
              self.rich.parse(sugg_items[0], slotted=True),
              self.rich.parse(sugg_items[1], slotted=True),
          )
  
          desc_template = self.rich.parse(self.settings.desc_message, slotted=True)
          info_template = self.rich.parse(self.settings.info_message, slotted=True)
  
          render_hint = dn.starcachemap(
              self.render_hint,
              message_max_lines=message_max_lines,
              msg_ellipsis=msg_ellipsis,
              sugg_lines=sugg_lines,
              sugg_items_templates=sugg_items_templates,
              sugg_ellipses=(sugg_top_ellipsis, sugg_bottom_ellipsis),
              desc_template=desc_template,
              info_template=info_template,
          )
  
          with render_hint:
              (view, msgs, logs), time, width = yield
              while True:
                  msg = render_hint.send((state.hint, state.suggestions))
                  if msg is None:
                      if len(msgs) != 0:
                          msgs.clear()
                  else:
                      if len(msgs) != 1 or msgs[0] is not msg:
                          msgs.clear()
                          msgs.append(msg)
                  logs.extend(self.render_popup(state.popup, desc_template=desc_template, info_template=info_template))
                  (view, msgs, logs), time, width = yield (view, msgs, logs)
  
      def render_hint(
          self,
          hint,
          suggestions,
          *,
          message_max_lines,
          msg_ellipsis,
          sugg_lines,
          sugg_items_templates,
          sugg_ellipses,
          desc_template,
          info_template,
      ):
          msgs = []
  
          # draw hint
          msg = None
          if hint is not None and hint.message:
              msg = self.rich.parse(hint.message, root_tag=True)
              lines = 0
  
              def trim_lines(text):
                  nonlocal lines
                  if lines >= message_max_lines:
                      return mu.Text("")
  
                  if isinstance(text, mu.Newline):
                      lines += 1
                      if lines == message_max_lines:
                          return mu.Group((text, msg_ellipsis))
  
                  else:
                      for i, ch in enumerate(text.string):
                          if ch == "\n":
                              lines += 1
                          if lines == message_max_lines:
                              return mu.Group((mu.Text(text.string[:i+1]), msg_ellipsis))
  
                  return text
  
              msg = msg.traverse((mu.Text, mu.Newline), trim_lines)
  
              if isinstance(hint, beatinputs.DescHint):
                  msg = desc_template(msg)
              elif isinstance(hint, beatinputs.InfoHint):
                  msg = info_template(msg)
              else:
                  assert False
              msg = msg.expand()
  
          if suggestions[0] is not None:
              suggs_list, sugg_index = suggestions
              sugg_start = sugg_index // sugg_lines * sugg_lines
              sugg_end = sugg_start + sugg_lines
              suggs = suggs_list[sugg_start:sugg_end]
  
              res = []
              for i, sugg in enumerate(suggs):
                  sugg = mu.Text(sugg)
                  item_template = sugg_items_templates[1] if i == sugg_index - sugg_start else sugg_items_templates[0]
                  sugg = item_template(sugg)
                  res.append(sugg)
                  if i == sugg_index - sugg_start and msg is not None:
                      res.append(msg)
  
              if sugg_start > 0:
                  res.insert(0, sugg_ellipses[0])
              if sugg_end < len(suggs_list):
                  res.append(sugg_ellipses[1])
  
              nl = mu.Text("\n")
              is_fst = True
              for block in res:
                  if not is_fst:
                      msgs.append(nl)
                  msgs.append(block)
                  is_fst = False
  
          else:
              if msg is not None:
                  msgs.append(msg)
  
          return mu.Group(tuple(msgs)) if msgs else None
  
      def render_popup(self, popup, *, desc_template, info_template):
          logs = []
  
          # draw popup
          for hint in popup:
              msg = None
              if hint.message:
                  msg = self.rich.parse(hint.message, root_tag=True)
  
                  if isinstance(hint, beatinputs.DescHint):
                      msg = desc_template(msg)
                  elif isinstance(hint, beatinputs.InfoHint):
                      msg = info_template(msg)
                  else:
                      assert False
  
                  msg = mu.Group((msg, mu.Text("\n")))
                  msg = msg.expand()
  
              if msg is not None:
                  logs.append(msg)
  
          return logs
  
  