class Reline::LineEditor

# File lib/reline/line_editor.rb, line 692
def add_dialog_proc(name, p, context = nil)
  dialog = Dialog.new(name, @config, DialogProcScope.new(self, @config, p, context))
  if index = @dialogs.find_index { |d| d.name == name }
    @dialogs[index] = dialog
  else
    @dialogs << dialog
  end
end

# File lib/reline/line_editor.rb, line 1282
def byte_pointer=(val)
  @byte_pointer = val
end

# File lib/reline/line_editor.rb, line 398
def calculate_overlay_levels(overlay_levels)
  levels = []
  overlay_levels.each do |x, w, l|
    levels.fill(l, x, w)
  end
  levels
end

# File lib/reline/line_editor.rb, line 1122
def call_completion_proc(pre, target, post, quote)
  Reline.core.instance_variable_set(:@completion_quote_character, quote)
  result = call_completion_proc_with_checking_args(pre, target, post)
  Reline.core.instance_variable_set(:@completion_quote_character, nil)
  result
end

# File lib/reline/line_editor.rb, line 84
def encoding
  io_gate.encoding
end

# File lib/reline/line_editor.rb, line 220
def eof?
  @eof
end

# File lib/reline/line_editor.rb, line 216
def finalize
  Signal.trap('INT', @old_trap)
end

# File lib/reline/line_editor.rb, line 1302
def finish
  @finished = true
  @config.reset
end

# File lib/reline/line_editor.rb, line 1298
def finished?
  @finished
end

# File lib/reline/line_editor.rb, line 168
def handle_signal
  handle_interrupted
  handle_resized
end

# File lib/reline/line_editor.rb, line 1043
def input_key(key)
  save_old_buffer
  @config.reset_oneshot_key_bindings
  if key.char.nil?
    process_insert(force: true)
    @eof = buffer_empty?
    finish
    return
  end
  @dialogs.each do |dialog|
    if key.method_symbol == dialog.name
      return
    end
  end
  @completion_occurs = false

  process_key(key.char, key.method_symbol)
  if @config.editing_mode_is?(:vi_command) and @byte_pointer > 0 and @byte_pointer == current_line.bytesize
    byte_size = Reline::Unicode.get_prev_mbchar_size(@buffer_of_lines[@line_index], @byte_pointer)
    @byte_pointer -= byte_size
  end

  @prev_action_state, @next_action_state = @next_action_state, NullActionState

  unless @completion_occurs
    @completion_state = CompletionState::NORMAL
    @completion_journey_state = nil
  end

  push_input_lines unless @restoring
  @restoring = false

  if @in_pasting
    clear_dialogs
    return
  end

  modified = @old_buffer_of_lines != @buffer_of_lines
  if !@completion_occurs && modified && !@config.disable_completion && @config.autocompletion
    # Auto complete starts only when edited
    process_insert(force: true)
    @completion_journey_state = retrieve_completion_journey_state
  end
  modified
end

# File lib/reline/line_editor.rb, line 1228
def insert_multiline_text(text)
  pre = @buffer_of_lines[@line_index].byteslice(0, @byte_pointer)
  post = @buffer_of_lines[@line_index].byteslice(@byte_pointer..)
  lines = (pre + Reline::Unicode.safe_encode(text, encoding).gsub(/\r\n?/, "\n") + post).split("\n", -1)
  lines << '' if lines.empty?
  @buffer_of_lines[@line_index, 1] = lines
  @line_index += lines.size - 1
  @byte_pointer = @buffer_of_lines[@line_index].bytesize - post.bytesize
end

# File lib/reline/line_editor.rb, line 1238
def insert_text(text)
  if @buffer_of_lines[@line_index].bytesize == @byte_pointer
    @buffer_of_lines[@line_index] += text
  else
    @buffer_of_lines[@line_index] = byteinsert(@buffer_of_lines[@line_index], @byte_pointer, text)
  end
  @byte_pointer += text.bytesize
  process_auto_indent
end

# File lib/reline/line_editor.rb, line 80
def io_gate
  Reline::IOGate
end

# File lib/reline/line_editor.rb, line 1168
def line()
  @buffer_of_lines.join("\n") unless eof?
end

# File lib/reline/line_editor.rb, line 351
def modified_lines
  with_cache(__method__, whole_lines, finished?) do |whole, complete|
    modify_lines(whole, complete)
  end
end

# File lib/reline/line_editor.rb, line 273
def multiline_off
  @is_multiline = false
end

# File lib/reline/line_editor.rb, line 269
def multiline_on
  @is_multiline = true
end

# File lib/reline/line_editor.rb, line 473
def print_nomultiline_prompt
  Reline::IOGate.disable_auto_linewrap(true) if Reline::IOGate.win?
  # Readline's test `TestRelineAsReadline#test_readline` requires first output to be prompt, not cursor reset escape sequence.
  Reline::IOGate.write Reline::Unicode.strip_non_printing_start_end(@prompt) if @prompt && !@is_multiline
ensure
  Reline::IOGate.disable_auto_linewrap(false) if Reline::IOGate.win?
end

# File lib/reline/line_editor.rb, line 357
def prompt_list
  with_cache(__method__, whole_lines, check_mode_string, @vi_arg, @searching_prompt) do |lines, mode_string|
    check_multiline_prompt(lines, mode_string)
  end
end

# File lib/reline/line_editor.rb, line 1093
def push_input_lines
  if @old_buffer_of_lines == @buffer_of_lines
    @input_lines[@input_lines_position] = [@buffer_of_lines.dup, @byte_pointer, @line_index]
  else
    @input_lines = @input_lines[0..@input_lines_position]
    @input_lines_position += 1
    @input_lines.push([@buffer_of_lines.dup, @byte_pointer, @line_index])
  end
  trim_input_lines
end

# File lib/reline/line_editor.rb, line 481
def render
  wrapped_cursor_x, wrapped_cursor_y = wrapped_cursor_position
  new_lines = wrapped_prompt_and_input_lines.flatten(1)[screen_scroll_top, screen_height].map do |prompt, line|
    prompt_width = Reline::Unicode.calculate_width(prompt, true)
    [[0, prompt_width, prompt], [prompt_width, Reline::Unicode.calculate_width(line, true), line]]
  end
  if @menu_info
    @menu_info.lines(screen_width).each do |item|
      new_lines << [[0, Reline::Unicode.calculate_width(item), item]]
    end
    @menu_info = nil # TODO: do not change state here
  end

  @dialogs.each_with_index do |dialog, index|
    next unless dialog.contents

    x_range, y_range = dialog_range dialog, wrapped_cursor_y - screen_scroll_top
    y_range.each do |row|
      next if row < 0 || row >= screen_height

      dialog_rows = new_lines[row] ||= []
      # index 0 is for prompt, index 1 is for line, index 2.. is for dialog
      dialog_rows[index + 2] = [x_range.begin, dialog.width, dialog.contents[row - y_range.begin]]
    end
  end

  Reline::IOGate.buffered_output do
    render_differential new_lines, wrapped_cursor_x, wrapped_cursor_y - screen_scroll_top
  end
end

# File lib/reline/line_editor.rb, line 461
def render_finished
  Reline::IOGate.buffered_output do
    render_differential([], 0, 0)
    lines = @buffer_of_lines.size.times.map do |i|
      line = Reline::Unicode.strip_non_printing_start_end(prompt_list[i]) + modified_lines[i]
      wrapped_lines = split_line_by_width(line, screen_width)
      wrapped_lines.last.empty? ? "#{line} " : line
    end
    Reline::IOGate.write lines.map { |l| "#{l}\r\n" }.join
  end
end

# File lib/reline/line_editor.rb, line 406
def render_line_differential(old_items, new_items)
  old_levels = calculate_overlay_levels(old_items.zip(new_items).each_with_index.map {|((x, w, c), (nx, _nw, nc)), i| [x, w, c == nc && x == nx ? i : -1] if x }.compact)
  new_levels = calculate_overlay_levels(new_items.each_with_index.map { |(x, w), i| [x, w, i] if x }.compact).take(screen_width)
  base_x = 0
  new_levels.zip(old_levels).chunk { |n, o| n == o ? :skip : n || :blank }.each do |level, chunk|
    width = chunk.size
    if level == :skip
      # do nothing
    elsif level == :blank
      Reline::IOGate.move_cursor_column base_x
      Reline::IOGate.write "#{Reline::IOGate.reset_color_sequence}#{' ' * width}"
    else
      x, w, content = new_items[level]
      cover_begin = base_x != 0 && new_levels[base_x - 1] == level
      cover_end = new_levels[base_x + width] == level
      pos = 0
      unless x == base_x && w == width
        content, pos = Reline::Unicode.take_mbchar_range(content, base_x - x, width, cover_begin: cover_begin, cover_end: cover_end, padding: true)
      end
      Reline::IOGate.move_cursor_column x + pos
      Reline::IOGate.write "#{Reline::IOGate.reset_color_sequence}#{content}#{Reline::IOGate.reset_color_sequence}"
    end
    base_x += width
  end
  if old_levels.size > new_levels.size
    Reline::IOGate.move_cursor_column new_levels.size
    Reline::IOGate.erase_after_cursor
  end
end

# File lib/reline/line_editor.rb, line 564
def rerender
  render unless @in_pasting
end

# File lib/reline/line_editor.rb, line 141
def reset(prompt = '')
  @screen_size = Reline::IOGate.get_screen_size
  reset_variables(prompt)
  @rendered_screen.base_y = Reline::IOGate.cursor_pos.y
  if ENV.key?('RELINE_ALT_SCROLLBAR')
    @full_block = '::'
    @upper_half_block = "''"
    @lower_half_block = '..'
    @block_elem_width = 2
  elsif Reline::IOGate.win?
    @full_block = '█'
    @upper_half_block = '▀'
    @lower_half_block = '▄'
    @block_elem_width = 1
  elsif encoding == Encoding::UTF_8
    @full_block = '█'
    @upper_half_block = '▀'
    @lower_half_block = '▄'
    @block_elem_width = Reline::Unicode.calculate_width('█')
  else
    @full_block = '::'
    @upper_half_block = "''"
    @lower_half_block = '..'
    @block_elem_width = 2
  end
end

# File lib/reline/line_editor.rb, line 261
def reset_line
  @byte_pointer = 0
  @buffer_of_lines = [String.new(encoding: encoding)]
  @line_index = 0
  @cache.clear
  @line_backup_in_history = nil
end

# File lib/reline/line_editor.rb, line 224
def reset_variables(prompt = '')
  @prompt = prompt.gsub("\n", "\\n")
  @mark_pointer = nil
  @is_multiline = false
  @finished = false
  @history_pointer = nil
  @kill_ring ||= Reline::KillRing.new
  @vi_clipboard = ''
  @vi_arg = nil
  @waiting_proc = nil
  @vi_waiting_operator = nil
  @vi_waiting_operator_arg = nil
  @completion_journey_state = nil
  @completion_state = CompletionState::NORMAL
  @perfect_matched = nil
  @menu_info = nil
  @searching_prompt = nil
  @just_cursor_moving = false
  @eof = false
  @continuous_insertion_buffer = String.new(encoding: encoding)
  @scroll_partial_screen = 0
  @drop_terminate_spaces = false
  @in_pasting = false
  @auto_indent_proc = nil
  @dialogs = []
  @interrupted = false
  @resized = false
  @cache = {}
  @rendered_screen = RenderedScreen.new(base_y: 0, lines: [], cursor_y: 0)
  @input_lines = [[[""], 0, 0]]
  @input_lines_position = 0
  @restoring = false
  @prev_action_state = NullActionState
  @next_action_state = NullActionState
  reset_line
end

# File lib/reline/line_editor.rb, line 560
def rest_height(wrapped_cursor_y)
  screen_height - wrapped_cursor_y + screen_scroll_top - @rendered_screen.base_y - 1
end

# File lib/reline/line_editor.rb, line 1187
def retrieve_completion_block
  quote_characters = Reline.completer_quote_characters
  before = current_line.byteslice(0, @byte_pointer).grapheme_clusters
  quote = nil
  # Calcualte closing quote when cursor is at the end of the line
  if current_line.bytesize == @byte_pointer && !quote_characters.empty?
    escaped = false
    before.each do |c|
      if escaped
        escaped = false
        next
      elsif c == '\\'
        escaped = true
      elsif quote
        quote = nil if c == quote
      elsif quote_characters.include?(c)
        quote = c
      end
    end
  end

  word_break_characters = quote_characters + Reline.completer_word_break_characters
  break_index = before.rindex { |c| word_break_characters.include?(c) || quote_characters.include?(c) } || -1
  preposing = before.take(break_index + 1).join
  target = before.drop(break_index + 1).join
  postposing = current_line.byteslice(@byte_pointer, current_line.bytesize - @byte_pointer)
  lines = whole_lines
  if @line_index > 0
    preposing = lines[0..(@line_index - 1)].join("\n") + "\n" + preposing
  end
  if (lines.size - 1) > @line_index
    postposing = postposing + "\n" + lines[(@line_index + 1)..-1].join("\n")
  end
  [preposing.encode(encoding), target.encode(encoding), postposing.encode(encoding), quote&.encode(encoding)]
end

# File lib/reline/line_editor.rb, line 1089
def save_old_buffer
  @old_buffer_of_lines = @buffer_of_lines.dup
end

# File lib/reline/line_editor.rb, line 363
def screen_height
  @screen_size.first
end

# File lib/reline/line_editor.rb, line 371
def screen_scroll_top
  @scroll_partial_screen
end

# File lib/reline/line_editor.rb, line 367
def screen_width
  @screen_size.last
end

# File lib/reline/line_editor.rb, line 1112
def scroll_into_view
  _wrapped_cursor_x, wrapped_cursor_y = wrapped_cursor_position
  if wrapped_cursor_y < screen_scroll_top
    @scroll_partial_screen = wrapped_cursor_y
  end
  if wrapped_cursor_y >= screen_scroll_top + screen_height
    @scroll_partial_screen = wrapped_cursor_y - screen_height + 1
  end
end

# File lib/reline/line_editor.rb, line 1176
def set_current_line(line, byte_pointer = nil)
  cursor = current_byte_pointer_cursor
  @buffer_of_lines[@line_index] = line
  if byte_pointer
    @byte_pointer = byte_pointer
  else
    calculate_nearest_cursor(cursor)
  end
  process_auto_indent
end

# File lib/reline/line_editor.rb, line 88
def set_pasting_state(in_pasting)
  # While pasting, text to be inserted is stored to @continuous_insertion_buffer.
  # After pasting, this buffer should be force inserted.
  process_insert(force: true) if @in_pasting && !in_pasting
  @in_pasting = in_pasting
end

# File lib/reline/line_editor.rb, line 207
def set_signal_handlers
  Reline::IOGate.set_winch_handler do
    @resized = true
  end
  @old_trap = Signal.trap('INT') do
    @interrupted = true
  end
end

# File lib/reline/line_editor.rb, line 1105
def trim_input_lines
  if @input_lines.size > MAX_INPUT_LINES
    @input_lines.shift
    @input_lines_position -= 1
  end
end

# File lib/reline/line_editor.rb, line 1033
def update(key)
  modified = input_key(key)
  unless @in_pasting
    scroll_into_view
    @just_cursor_moving = !modified
    update_dialogs(key)
    @just_cursor_moving = false
  end
end

# File lib/reline/line_editor.rb, line 453
def update_dialogs(key = nil)
  wrapped_cursor_x, wrapped_cursor_y = wrapped_cursor_position
  @dialogs.each do |dialog|
    dialog.trap_key = nil
    update_each_dialog(dialog, wrapped_cursor_x, wrapped_cursor_y - screen_scroll_top, key)
  end
end

# File lib/reline/line_editor.rb, line 556
def upper_space_height(wrapped_cursor_y)
  wrapped_cursor_y - screen_scroll_top
end

# File lib/reline/line_editor.rb, line 1290
def whole_buffer
  whole_lines.join("\n")
end

# File lib/reline/line_editor.rb, line 1286
def whole_lines
  @buffer_of_lines.dup
end

# File lib/reline/line_editor.rb, line 343
def with_cache(key, *deps)
  cached_deps, value = @cache[key]
  if cached_deps != deps
    @cache[key] = [deps, value = yield(*deps, cached_deps, value)]
  end
  value
end

# File lib/reline/line_editor.rb, line 948
def wrap_method_call(method_symbol, method_obj, key, with_operator = false)
  if @config.editing_mode_is?(:emacs, :vi_insert) and @vi_waiting_operator.nil?
    not_insertion = method_symbol != :ed_insert
    process_insert(force: not_insertion)
  end
  if @vi_arg and argumentable?(method_obj)
    if with_operator and inclusive?(method_obj)
      method_obj.(key, arg: @vi_arg, inclusive: true)
    else
      method_obj.(key, arg: @vi_arg)
    end
  else
    if with_operator and inclusive?(method_obj)
      method_obj.(key, inclusive: true)
    else
      method_obj.(key)
    end
  end
end

# File lib/reline/line_editor.rb, line 437
def wrapped_cursor_position
  prompt_width = calculate_width(prompt_list[@line_index], true)
  line_before_cursor = Reline::Unicode.escape_for_print(whole_lines[@line_index].byteslice(0, @byte_pointer))
  wrapped_line_before_cursor = split_line_by_width(' ' * prompt_width + line_before_cursor, screen_width)
  wrapped_cursor_y = wrapped_prompt_and_input_lines[0...@line_index].sum(&:size) + wrapped_line_before_cursor.size - 1
  wrapped_cursor_x = calculate_width(wrapped_line_before_cursor.last)
  [wrapped_cursor_x, wrapped_cursor_y]
end

# File lib/reline/line_editor.rb, line 375
def wrapped_prompt_and_input_lines
  with_cache(__method__, @buffer_of_lines.size, modified_lines, prompt_list, screen_width) do |n, lines, prompts, width, prev_cache_key, cached_value|
    prev_n, prev_lines, prev_prompts, prev_width = prev_cache_key
    cached_wraps = {}
    if prev_width == width
      prev_n.times do |i|
        cached_wraps[[prev_prompts[i], prev_lines[i]]] = cached_value[i]
      end
    end

    n.times.map do |i|
      prompt = prompts[i] || ''
      line = lines[i] || ''
      if (cached = cached_wraps[[prompt, line]])
        next cached
      end
      *wrapped_prompts, code_line_prompt = split_line_by_width(prompt, width)
      wrapped_lines = split_line_by_width(line, width, offset: calculate_width(code_line_prompt, true))
      wrapped_prompts.map { |p| [p, ''] } + [[code_line_prompt, wrapped_lines.first]] + wrapped_lines.drop(1).map { |c| ['', c] }
    end
  end
end

# File lib/reline/line_editor.rb, line 938
        def argumentable?(method_obj)
  method_obj and method_obj.parameters.any? { |param| param[0] == :key and param[1] == :arg }
end

# File lib/reline/line_editor.rb, line 1294
        def buffer_empty?
  current_line.empty? and @buffer_of_lines.size == 1
end

# File lib/reline/line_editor.rb, line 1313
        def byteinsert(str, byte_pointer, other)
  new_str = str.byteslice(0, byte_pointer)
  new_str << other
  new_str << str.byteslice(byte_pointer, str.bytesize)
  new_str
end

# File lib/reline/line_editor.rb, line 1307
        def byteslice!(str, byte_pointer, size)
  new_str = str.byteslice(0, byte_pointer)
  new_str << str.byteslice(byte_pointer + size, str.bytesize)
  [new_str, str.byteslice(byte_pointer, size)]
end

# File lib/reline/line_editor.rb, line 308
        def calculate_nearest_cursor(cursor)
  line_to_calc = current_line
  new_cursor_max = calculate_width(line_to_calc)
  new_cursor = 0
  new_byte_pointer = 0
  height = 1
  max_width = screen_width
  if @config.editing_mode_is?(:vi_command)
    last_byte_size = Reline::Unicode.get_prev_mbchar_size(line_to_calc, line_to_calc.bytesize)
    if last_byte_size > 0
      last_mbchar = line_to_calc.byteslice(line_to_calc.bytesize - last_byte_size, last_byte_size)
      last_width = Reline::Unicode.get_mbchar_width(last_mbchar)
      end_of_line_cursor = new_cursor_max - last_width
    else
    end_of_line_cursor = new_cursor_max
    end
  else
  end_of_line_cursor = new_cursor_max
  end
  line_to_calc.grapheme_clusters.each do |gc|
    mbchar = gc.encode(Encoding::UTF_8)
    mbchar_width = Reline::Unicode.get_mbchar_width(mbchar)
    now = new_cursor + mbchar_width
    if now > end_of_line_cursor or now > cursor
      break
    end
    new_cursor += mbchar_width
    if new_cursor > max_width * height
      height += 1
    end
    new_byte_pointer += gc.bytesize
  end
  @byte_pointer = new_byte_pointer
end

# File lib/reline/line_editor.rb, line 1320
        def calculate_width(str, allow_escape_code = false)
  Reline::Unicode.calculate_width(str, allow_escape_code)
end

# File lib/reline/line_editor.rb, line 95
        def check_mode_string
  if @config.show_mode_in_prompt
    if @config.editing_mode_is?(:vi_command)
      @config.vi_cmd_mode_string
    elsif @config.editing_mode_is?(:vi_insert)
      @config.vi_ins_mode_string
    elsif @config.editing_mode_is?(:emacs)
      @config.emacs_mode_string
    else
      '?'
    end
  end
end

# File lib/reline/line_editor.rb, line 109
        def check_multiline_prompt(buffer, mode_string)
  if @vi_arg
    prompt = "(arg: #{@vi_arg}) "
  elsif @searching_prompt
    prompt = @searching_prompt
  else
    prompt = @prompt
  end
  if !@is_multiline
    mode_string = check_mode_string
    prompt = mode_string + prompt if mode_string
    [prompt] + [''] * (buffer.size - 1)
  elsif @prompt_proc
    prompt_list = @prompt_proc.(buffer).map { |pr| pr.gsub("\n", "\\n") }
    prompt_list.map!{ prompt } if @vi_arg or @searching_prompt
    prompt_list = [prompt] if prompt_list.empty?
    prompt_list = prompt_list.map{ |pr| mode_string + pr } if mode_string
    prompt = prompt_list[@line_index]
    prompt = prompt_list[0] if prompt.nil?
    prompt = prompt_list.last if prompt.nil?
    if buffer.size > prompt_list.size
      (buffer.size - prompt_list.size).times do
        prompt_list << prompt_list.last
      end
    end
    prompt_list
  else
    prompt = mode_string + prompt if mode_string
    [prompt] * buffer.size
  end
end

# File lib/reline/line_editor.rb, line 968
        def cleanup_waiting
  @waiting_proc = nil
  @vi_waiting_operator = nil
  @vi_waiting_operator_arg = nil
  @searching_prompt = nil
  @drop_terminate_spaces = false
end

# File lib/reline/line_editor.rb, line 551
        def clear_rendered_screen_cache
  @rendered_screen.lines = []
  @rendered_screen.cursor_y = 0
end

# File lib/reline/line_editor.rb, line 1340
        def complete(_key)
  return if @config.disable_completion

  process_insert(force: true)
  if @config.autocompletion
    @completion_state = CompletionState::NORMAL
    @completion_occurs = move_completed_list(:down)
  else
    @completion_journey_state = nil
    pre, target, post, quote = retrieve_completion_block
    result = call_completion_proc(pre, target, post, quote)
    if result.is_a?(Array)
      @completion_occurs = true
      perform_completion(pre, target, post, quote, result)
    end
  end
end

# File lib/reline/line_editor.rb, line 1358
        def completion_journey_move(direction)
  return if @config.disable_completion

  process_insert(force: true)
  @completion_state = CompletionState::NORMAL
  @completion_occurs = move_completed_list(direction)
end

# File lib/reline/line_editor.rb, line 1374
        def completion_journey_up(_key)
  completion_journey_move(:up) if @config.autocompletion
end

# File lib/reline/line_editor.rb, line 1942
        def copy_for_vi(text)
  if @config.editing_mode_is?(:vi_insert) or @config.editing_mode_is?(:vi_command)
    @vi_clipboard = text
  end
end

# File lib/reline/line_editor.rb, line 703
        def dialog_range(dialog, dialog_y)
  x_range = dialog.column...dialog.column + dialog.width
  y_range = dialog_y + dialog.vertical_offset...dialog_y + dialog.vertical_offset + dialog.contents.size
  [x_range, y_range]
end

# File lib/reline/line_editor.rb, line 2195
        def ed_argument_digit(key)
  # key is expected to be `ESC digit` or `digit`
  num = key[/\d/].to_i
  @vi_arg = (@vi_arg || 0) * 10 + num
end

# File lib/reline/line_editor.rb, line 1822
        def ed_clear_screen(key)
  Reline::IOGate.clear_screen
  @screen_size = Reline::IOGate.get_screen_size
  @rendered_screen.base_y = 0
  clear_rendered_screen_cache
end

# File lib/reline/line_editor.rb, line 2141
        def ed_delete_next_char(key, arg: 1)
  byte_size = Reline::Unicode.get_next_mbchar_size(current_line, @byte_pointer)
  unless current_line.empty? || byte_size == 0
    line, mbchar = byteslice!(current_line, @byte_pointer, byte_size)
    copy_for_vi(mbchar)
    if @byte_pointer > 0 && current_line.bytesize == @byte_pointer + byte_size
      byte_size = Reline::Unicode.get_prev_mbchar_size(line, @byte_pointer)
      set_current_line(line, @byte_pointer - byte_size)
    else
      set_current_line(line, @byte_pointer)
    end
  end
  arg -= 1
  ed_delete_next_char(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 2053
        def ed_delete_prev_char(key, arg: 1)
  deleted = +''
  arg.times do
    if @byte_pointer > 0
      byte_size = Reline::Unicode.get_prev_mbchar_size(current_line, @byte_pointer)
      @byte_pointer -= byte_size
      line, mbchar = byteslice!(current_line, @byte_pointer, byte_size)
      set_current_line(line)
      deleted.prepend(mbchar)
    end
  end
  copy_for_vi(deleted)
end

# File lib/reline/line_editor.rb, line 1856
        def ed_delete_prev_word(key)
  if @byte_pointer > 0
    byte_size = Reline::Unicode.em_backward_word(current_line, @byte_pointer)
    line, word = byteslice!(current_line, @byte_pointer - byte_size, byte_size)
    set_current_line(line, @byte_pointer - byte_size)
    @kill_ring.append(word, true)
  end
end

# File lib/reline/line_editor.rb, line 1401
        def ed_insert(str)
  begin
    str.encode(Encoding::UTF_8)
  rescue Encoding::UndefinedConversionError
    return
  end
  if @in_pasting
    @continuous_insertion_buffer << str
    return
  elsif not @continuous_insertion_buffer.empty?
    process_insert
  end

  insert_text(str)
end

# File lib/reline/line_editor.rb, line 1733
        def ed_kill_line(key)
  if current_line.bytesize > @byte_pointer
    line, deleted = byteslice!(current_line, @byte_pointer, current_line.bytesize - @byte_pointer)
    set_current_line(line, line.bytesize)
    @kill_ring.append(deleted)
  elsif @byte_pointer == current_line.bytesize and @buffer_of_lines.size > @line_index + 1
    set_current_line(current_line + @buffer_of_lines.delete_at(@line_index + 1), current_line.bytesize)
  end
end

# File lib/reline/line_editor.rb, line 1460
        def ed_move_to_beg(key)
  @byte_pointer = 0
end

# File lib/reline/line_editor.rb, line 1466
        def ed_move_to_end(key)
  @byte_pointer = current_line.bytesize
end

# File lib/reline/line_editor.rb, line 1683
        def ed_newline(key)
  process_insert(force: true)
  if @is_multiline
    if @config.editing_mode_is?(:vi_command)
      if @line_index < (@buffer_of_lines.size - 1)
        ed_next_history(key) # means cursor down
      else
        # should check confirm_multiline_termination to finish?
        finish
      end
    else
      if @line_index == (@buffer_of_lines.size - 1)
        if confirm_multiline_termination
          finish
        else
          key_newline(key)
        end
      else
        # should check confirm_multiline_termination to finish?
        @line_index = @buffer_of_lines.size - 1
        @byte_pointer = current_line.bytesize
        finish
      end
    end
  else
    finish
  end
end

# File lib/reline/line_editor.rb, line 1430
        def ed_next_char(key, arg: 1)
  byte_size = Reline::Unicode.get_next_mbchar_size(current_line, @byte_pointer)
  if (@byte_pointer < current_line.bytesize)
    @byte_pointer += byte_size
  elsif @config.editing_mode_is?(:emacs) and @byte_pointer == current_line.bytesize and @line_index < @buffer_of_lines.size - 1
    @byte_pointer = 0
    @line_index += 1
  end
  arg -= 1
  ed_next_char(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 1896
        def em_capitol_case(key)
  if current_line.bytesize > @byte_pointer
    byte_size, new_str = Reline::Unicode.em_forward_word_with_capitalization(current_line, @byte_pointer)
    before = current_line.byteslice(0, @byte_pointer)
    after = current_line.byteslice((@byte_pointer + byte_size)..-1)
    set_current_line(before + new_str + after, @byte_pointer + new_str.bytesize)
  end
end

# File lib/reline/line_editor.rb, line 1777
        def em_delete(key)
  if buffer_empty? and key == "\C-d"
    @eof = true
    finish
  elsif @byte_pointer < current_line.bytesize
    splitted_last = current_line.byteslice(@byte_pointer, current_line.bytesize)
    mbchar = splitted_last.grapheme_clusters.first
    line, = byteslice!(current_line, @byte_pointer, mbchar.bytesize)
    set_current_line(line)
  elsif @byte_pointer == current_line.bytesize and @buffer_of_lines.size > @line_index + 1
    set_current_line(current_line + @buffer_of_lines.delete_at(@line_index + 1), current_line.bytesize)
  end
end

# File lib/reline/line_editor.rb, line 1846
        def em_delete_next_word(key)
  if current_line.bytesize > @byte_pointer
    byte_size = Reline::Unicode.em_forward_word(current_line, @byte_pointer)
    line, word = byteslice!(current_line, @byte_pointer, byte_size)
    set_current_line(line)
    @kill_ring.append(word)
  end
end

# File lib/reline/line_editor.rb, line 1792
        def em_delete_or_list(key)
  if current_line.empty? or @byte_pointer < current_line.bytesize
    em_delete(key)
  elsif !@config.autocompletion # show completed list
    pre, target, post, quote = retrieve_completion_block
    result = call_completion_proc(pre, target, post, quote)
    if result.is_a?(Array)
      candidates = filter_normalize_candidates(target, result)
      menu(candidates)
    end
  end
end

# File lib/reline/line_editor.rb, line 1712
        def em_delete_prev_char(key, arg: 1)
  arg.times do
    if @byte_pointer == 0 and @line_index > 0
      @byte_pointer = @buffer_of_lines[@line_index - 1].bytesize
      @buffer_of_lines[@line_index - 1] += @buffer_of_lines.delete_at(@line_index)
      @line_index -= 1
    elsif @byte_pointer > 0
      byte_size = Reline::Unicode.get_prev_mbchar_size(current_line, @byte_pointer)
      line, = byteslice!(current_line, @byte_pointer - byte_size, byte_size)
      set_current_line(line, @byte_pointer - byte_size)
    end
  end
  process_auto_indent
end

# File lib/reline/line_editor.rb, line 2336
        def em_exchange_mark(key)
  return unless @mark_pointer
  new_pointer = [@byte_pointer, @line_index]
  @byte_pointer, @line_index = @mark_pointer
  @mark_pointer = new_pointer
end

# File lib/reline/line_editor.rb, line 1769
        def em_kill_line(key)
  if current_line.size > 0
    @kill_ring.append(current_line.dup, true)
    set_current_line('', 0)
  end
end

# File lib/reline/line_editor.rb, line 1932
        def em_kill_region(key)
  if @byte_pointer > 0
    byte_size = Reline::Unicode.em_big_backward_word(current_line, @byte_pointer)
    line, deleted = byteslice!(current_line, @byte_pointer - byte_size, byte_size)
    set_current_line(line, @byte_pointer - byte_size)
    @kill_ring.append(deleted, true)
  end
end

# File lib/reline/line_editor.rb, line 1906
        def em_lower_case(key)
  if current_line.bytesize > @byte_pointer
    byte_size = Reline::Unicode.em_forward_word(current_line, @byte_pointer)
    part = current_line.byteslice(@byte_pointer, byte_size).grapheme_clusters.map { |mbchar|
      mbchar =~ /[A-Z]/ ? mbchar.downcase : mbchar
    }.join
    rest = current_line.byteslice((@byte_pointer + byte_size)..-1)
    line = current_line.byteslice(0, @byte_pointer) + part
    set_current_line(line + rest, line.bytesize)
  end
end

# File lib/reline/line_editor.rb, line 1830
        def em_next_word(key)
  if current_line.bytesize > @byte_pointer
    byte_size = Reline::Unicode.em_forward_word(current_line, @byte_pointer)
    @byte_pointer += byte_size
  end
end

# File lib/reline/line_editor.rb, line 2331
        def em_set_mark(key)
  @mark_pointer = [@byte_pointer, @line_index]
end

# File lib/reline/line_editor.rb, line 1919
        def em_upper_case(key)
  if current_line.bytesize > @byte_pointer
    byte_size = Reline::Unicode.em_forward_word(current_line, @byte_pointer)
    part = current_line.byteslice(@byte_pointer, byte_size).grapheme_clusters.map { |mbchar|
      mbchar =~ /[a-z]/ ? mbchar.upcase : mbchar
    }.join
    rest = current_line.byteslice((@byte_pointer + byte_size)..-1)
    line = current_line.byteslice(0, @byte_pointer) + part
    set_current_line(line + rest, line.bytesize)
  end
end

# File lib/reline/line_editor.rb, line 1806
        def em_yank(key)
  yanked = @kill_ring.yank
  insert_text(yanked) if yanked
end

# File lib/reline/line_editor.rb, line 1812
        def em_yank_pop(key)
  yanked, prev_yank = @kill_ring.yank_pop
  if yanked
    line, = byteslice!(current_line, @byte_pointer - prev_yank.bytesize, prev_yank.bytesize)
    set_current_line(line, @byte_pointer - prev_yank.bytesize)
    insert_text(yanked)
  end
end

# File lib/reline/line_editor.rb, line 2344
        def emacs_editing_mode(key)
  @config.editing_mode = :emacs
end

# File lib/reline/line_editor.rb, line 809
        def filter_normalize_candidates(target, list)
  target = target.downcase if @config.completion_ignore_case
  list.select do |item|
    next unless item
    unless Encoding.compatible?(target.encoding, item.encoding)
      # Workaround for Readline test
      if defined?(::Readline) && ::Readline == ::Reline
        raise Encoding::CompatibilityError, "incompatible character encodings: #{target.encoding} and #{item.encoding}"
      end
    end

    if @config.completion_ignore_case
      item.downcase.start_with?(target)
    else
      item.start_with?(target)
    end
  end.map do |item|
    item.unicode_normalize
  rescue Encoding::CompatibilityError
    item
  end.uniq
end

# File lib/reline/line_editor.rb, line 1471
        def generate_searcher(search_key)
  search_word = String.new(encoding: encoding)
  hit_pointer = nil
  lambda do |key|
    search_again = false
    case key
    when "\C-h", "\C-?"
      grapheme_clusters = search_word.grapheme_clusters
      if grapheme_clusters.size > 0
        grapheme_clusters.pop
        search_word = grapheme_clusters.join
      end
    when "\C-r", "\C-s"
      search_again = true if search_key == key
      search_key = key
    else
      search_word << key
    end
    hit = nil
    if not search_word.empty? and @line_backup_in_history&.include?(search_word)
      hit_pointer = Reline::HISTORY.size
      hit = @line_backup_in_history
    else
      if search_again
        if search_word.empty? and Reline.last_incremental_search
          search_word = Reline.last_incremental_search
        end
        if @history_pointer
          case search_key
          when "\C-r"
            history_pointer_base = 0
            history = Reline::HISTORY[0..(@history_pointer - 1)]
          when "\C-s"
            history_pointer_base = @history_pointer + 1
            history = Reline::HISTORY[(@history_pointer + 1)..-1]
          end
        else
          history_pointer_base = 0
          history = Reline::HISTORY
        end
      elsif @history_pointer
        case search_key
        when "\C-r"
          history_pointer_base = 0
          history = Reline::HISTORY[0..@history_pointer]
        when "\C-s"
          history_pointer_base = @history_pointer
          history = Reline::HISTORY[@history_pointer..-1]
        end
      else
        history_pointer_base = 0
        history = Reline::HISTORY
      end
      case search_key
      when "\C-r"
        hit_index = history.rindex { |item|
          item.include?(search_word)
        }
      when "\C-s"
        hit_index = history.index { |item|
          item.include?(search_word)
        }
      end
      if hit_index
        hit_pointer = history_pointer_base + hit_index
        hit = Reline::HISTORY[hit_pointer]
      end
    end
    case search_key
    when "\C-r"
      prompt_name = 'reverse-i-search'
    when "\C-s"
      prompt_name = 'i-search'
    end
    prompt_name = "failed #{prompt_name}" unless hit
    [search_word, prompt_name, hit_pointer]
  end
end

# File lib/reline/line_editor.rb, line 185
        def handle_interrupted
  return unless @interrupted

  @interrupted = false
  clear_dialogs
  render
  cursor_to_bottom_offset = @rendered_screen.lines.size - @rendered_screen.cursor_y
  Reline::IOGate.scroll_down cursor_to_bottom_offset
  Reline::IOGate.move_cursor_column 0
  clear_rendered_screen_cache
  case @old_trap
  when 'DEFAULT', 'SYSTEM_DEFAULT'
    raise Interrupt
  when 'IGNORE'
    # Do nothing
  when 'EXIT'
    exit
  else
    @old_trap.call if @old_trap.respond_to?(:call)
  end
end

# File lib/reline/line_editor.rb, line 173
        def handle_resized
  return unless @resized

  @screen_size = Reline::IOGate.get_screen_size
  @resized = false
  scroll_into_view
  Reline::IOGate.move_cursor_up @rendered_screen.cursor_y
  @rendered_screen.base_y = Reline::IOGate.cursor_pos.y
  clear_rendered_screen_cache
  render
end

# File lib/reline/line_editor.rb, line 942
        def inclusive?(method_obj)
  # If a motion method with the keyword argument "inclusive" follows the
  # operator, it must contain the character at the cursor position.
  method_obj and method_obj.parameters.any? { |param| param[0] == :key and param[1] == :inclusive }
end

# File lib/reline/line_editor.rb, line 1550
        def incremental_search_history(key)
  backup = @buffer_of_lines.dup, @line_index, @byte_pointer, @history_pointer, @line_backup_in_history
  searcher = generate_searcher(key)
  @searching_prompt = "(reverse-i-search)`': "
  termination_keys = ["\C-j"]
  termination_keys.concat(@config.isearch_terminators.chars) if @config.isearch_terminators
  @waiting_proc = ->(k) {
    if k == "\C-g"
      # cancel search and restore buffer
      @buffer_of_lines, @line_index, @byte_pointer, @history_pointer, @line_backup_in_history = backup
      @searching_prompt = nil
      @waiting_proc = nil
    elsif !termination_keys.include?(k) && (k.match?(/[[:print:]]/) || k == "\C-h" || k == "\C-?" || k == "\C-r" || k == "\C-s")
      search_word, prompt_name, hit_pointer = searcher.call(k)
      Reline.last_incremental_search = search_word
      @searching_prompt = "(%s)`%s'" % [prompt_name, search_word]
      @searching_prompt += ': ' unless @is_multiline
      move_history(hit_pointer, line: :end, cursor: :end) if hit_pointer
    else
      # terminaton_keys and other keys will terminalte
      move_history(@history_pointer, line: :end, cursor: :start)
      @searching_prompt = nil
      @waiting_proc = nil
    end
  }
end

# File lib/reline/line_editor.rb, line 277
        def insert_new_line(cursor_line, next_line)
  @buffer_of_lines.insert(@line_index + 1, String.new(next_line, encoding: encoding))
  @buffer_of_lines[@line_index] = cursor_line
  @line_index += 1
  @byte_pointer = 0
  if @auto_indent_proc && !@in_pasting
    if next_line.empty?
      (
        # For compatibility, use this calculation instead of just `process_auto_indent @line_index - 1, cursor_dependent: false`
        indent1 = @auto_indent_proc.(@buffer_of_lines.take(@line_index - 1).push(''), @line_index - 1, 0, true)
        indent2 = @auto_indent_proc.(@buffer_of_lines.take(@line_index), @line_index - 1, @buffer_of_lines[@line_index - 1].bytesize, false)
        indent = indent2 || indent1
        @buffer_of_lines[@line_index - 1] = ' ' * indent + @buffer_of_lines[@line_index - 1].gsub(/\A\s*/, '')
      )
      process_auto_indent @line_index, add_newline: true
    else
      process_auto_indent @line_index - 1, cursor_dependent: false
      process_auto_indent @line_index, add_newline: true # Need for compatibility
      process_auto_indent @line_index, cursor_dependent: false
    end
  end
end

# File lib/reline/line_editor.rb, line 1419
        def insert_raw_char(str, arg: 1)
  arg.times do
    if str == "\C-j" or str == "\C-m"
      key_newline(str)
    elsif str != "\0"
      # Ignore NUL.
      ed_insert(str)
    end
  end
end

# File lib/reline/line_editor.rb, line 1324
        def key_delete(key)
  if @config.editing_mode_is?(:vi_insert)
    ed_delete_next_char(key)
  elsif @config.editing_mode_is?(:emacs)
    em_delete(key)
  end
end

# File lib/reline/line_editor.rb, line 1332
        def key_newline(key)
  if @is_multiline
    next_line = current_line.byteslice(@byte_pointer, current_line.bytesize - @byte_pointer)
    cursor_line = current_line.byteslice(0, @byte_pointer)
    insert_new_line(cursor_line, next_line)
  end
end

# File lib/reline/line_editor.rb, line 2379
        def re_read_init_file(_key)
  @config.reload
end

# File lib/reline/line_editor.rb, line 2367
        def redo(_key)
  move_undo_redo(+1)
end

# File lib/reline/line_editor.rb, line 515
        def render_differential(new_lines, new_cursor_x, new_cursor_y)
  Reline::IOGate.disable_auto_linewrap(true) if Reline::IOGate.win?
  rendered_lines = @rendered_screen.lines
  cursor_y = @rendered_screen.cursor_y
  if new_lines != rendered_lines
    # Hide cursor while rendering to avoid cursor flickering.
    Reline::IOGate.hide_cursor
    num_lines = [[new_lines.size, rendered_lines.size].max, screen_height].min
    if @rendered_screen.base_y + num_lines > screen_height
      Reline::IOGate.scroll_down(num_lines - cursor_y - 1)
      @rendered_screen.base_y = screen_height - num_lines
      cursor_y = num_lines - 1
    end
    num_lines.times do |i|
      rendered_line = rendered_lines[i] || []
      line_to_render = new_lines[i] || []
      next if rendered_line == line_to_render

      Reline::IOGate.move_cursor_down i - cursor_y
      cursor_y = i
      unless rendered_lines[i]
        Reline::IOGate.move_cursor_column 0
        Reline::IOGate.erase_after_cursor
      end
      render_line_differential(rendered_line, line_to_render)
    end
    @rendered_screen.lines = new_lines
    Reline::IOGate.show_cursor
  end
  Reline::IOGate.move_cursor_column new_cursor_x
  Reline::IOGate.move_cursor_down new_cursor_y - cursor_y
  @rendered_screen.cursor_y = new_cursor_y
ensure
  Reline::IOGate.disable_auto_linewrap(false) if Reline::IOGate.win?
end

# File lib/reline/line_editor.rb, line 899
        def retrieve_completion_journey_state
  preposing, target, postposing, quote = retrieve_completion_block
  list = call_completion_proc(preposing, target, postposing, quote)
  return unless list.is_a?(Array)

  candidates = list.select{ |item| item.start_with?(target) }
  return if candidates.empty?

  pre = preposing.split("\n", -1).last || ''
  post = postposing.split("\n", -1).first || ''
  CompletionJourneyState.new(
    @line_index, pre, target, post, [target] + candidates, 0
  )
end

# File lib/reline/line_editor.rb, line 914
        def run_for_operators(key, method_symbol, &block)
  if @vi_waiting_operator
    if VI_MOTIONS.include?(method_symbol)
      old_byte_pointer = @byte_pointer
      @vi_arg = (@vi_arg || 1) * @vi_waiting_operator_arg
      block.(true)
      unless @waiting_proc
        byte_pointer_diff = @byte_pointer - old_byte_pointer
        @byte_pointer = old_byte_pointer
        method_obj = method(@vi_waiting_operator)
        wrap_method_call(@vi_waiting_operator, method_obj, byte_pointer_diff)
        cleanup_waiting
      end
    else
      # Ignores operator when not motion is given.
      block.(false)
      cleanup_waiting
    end
    @vi_arg = nil
  else
    block.(false)
  end
end

# File lib/reline/line_editor.rb, line 1587
        def search_history(prefix, pointer_range)
  pointer_range.each do |pointer|
    lines = Reline::HISTORY[pointer].split("\n")
    lines.each_with_index do |line, index|
      return [pointer, index] if line.start_with?(prefix)
    end
  end
  nil
end

# File lib/reline/line_editor.rb, line 2242
        def search_next_char(key, arg, need_prev_char: false, inclusive: false)
  prev_total = nil
  total = nil
  found = false
  current_line.byteslice(@byte_pointer..-1).grapheme_clusters.each do |mbchar|
    # total has [byte_size, cursor]
    unless total
      # skip cursor point
      width = Reline::Unicode.get_mbchar_width(mbchar)
      total = [mbchar.bytesize, width]
    else
      if key == mbchar
        arg -= 1
        if arg.zero?
          found = true
          break
        end
      end
      width = Reline::Unicode.get_mbchar_width(mbchar)
      prev_total = total
      total = [total.first + mbchar.bytesize, total.last + width]
    end
  end
  if not need_prev_char and found and total
    byte_size, _ = total
    @byte_pointer += byte_size
  elsif need_prev_char and found and prev_total
    byte_size, _ = prev_total
    @byte_pointer += byte_size
  end
  if inclusive
    byte_size = Reline::Unicode.get_next_mbchar_size(current_line, @byte_pointer)
    if byte_size > 0
      @byte_pointer += byte_size
    end
  end
  @waiting_proc = nil
end

# File lib/reline/line_editor.rb, line 2289
        def search_prev_char(key, arg, need_next_char = false)
  prev_total = nil
  total = nil
  found = false
  current_line.byteslice(0..@byte_pointer).grapheme_clusters.reverse_each do |mbchar|
    # total has [byte_size, cursor]
    unless total
      # skip cursor point
      width = Reline::Unicode.get_mbchar_width(mbchar)
      total = [mbchar.bytesize, width]
    else
      if key == mbchar
        arg -= 1
        if arg.zero?
          found = true
          break
        end
      end
      width = Reline::Unicode.get_mbchar_width(mbchar)
      prev_total = total
      total = [total.first + mbchar.bytesize, total.last + width]
    end
  end
  if not need_next_char and found and total
    byte_size, _ = total
    @byte_pointer -= byte_size
  elsif need_next_char and found and prev_total
    byte_size, _ = prev_total
    @byte_pointer -= byte_size
  end
  @waiting_proc = nil
end

# File lib/reline/line_editor.rb, line 2375
        def set_next_action_state(type, value)
  @next_action_state = [type, value]
end

# File lib/reline/line_editor.rb, line 300
        def split_line_by_width(str, max_width, offset: 0)
  Reline::Unicode.split_line_by_width(str, max_width, encoding, offset: offset)
end

# File lib/reline/line_editor.rb, line 2363
        def undo(_key)
  move_undo_redo(-1)
end

# File lib/reline/line_editor.rb, line 709
        def update_each_dialog(dialog, cursor_column, cursor_row, key = nil)
  dialog.set_cursor_pos(cursor_column, cursor_row)
  dialog_render_info = dialog.call(key)
  if dialog_render_info.nil? or dialog_render_info.contents.nil? or dialog_render_info.contents.empty?
    dialog.contents = nil
    dialog.trap_key = nil
    return
  end
  contents = dialog_render_info.contents
  pointer = dialog.pointer
  if dialog_render_info.width
    dialog.width = dialog_render_info.width
  else
    dialog.width = contents.map { |l| calculate_width(l, true) }.max
  end
  height = dialog_render_info.height || DIALOG_DEFAULT_HEIGHT
  height = contents.size if contents.size < height
  if contents.size > height
    if dialog.pointer
      if dialog.pointer < 0
        dialog.scroll_top = 0
      elsif (dialog.pointer - dialog.scroll_top) >= (height - 1)
        dialog.scroll_top = dialog.pointer - (height - 1)
      elsif (dialog.pointer - dialog.scroll_top) < 0
        dialog.scroll_top = dialog.pointer
      end
      pointer = dialog.pointer - dialog.scroll_top
    else
      dialog.scroll_top = 0
    end
    contents = contents[dialog.scroll_top, height]
  end
  if dialog_render_info.scrollbar and dialog_render_info.contents.size > height
    bar_max_height = height * 2
    moving_distance = (dialog_render_info.contents.size - height) * 2
    position_ratio = dialog.scroll_top.zero? ? 0.0 : ((dialog.scroll_top * 2).to_f / moving_distance)
    bar_height = (bar_max_height * ((contents.size * 2).to_f / (dialog_render_info.contents.size * 2))).floor.to_i
    bar_height = MINIMUM_SCROLLBAR_HEIGHT if bar_height < MINIMUM_SCROLLBAR_HEIGHT
    scrollbar_pos = ((bar_max_height - bar_height) * position_ratio).floor.to_i
  else
    scrollbar_pos = nil
  end
  dialog.column = dialog_render_info.pos.x
  dialog.width += @block_elem_width if scrollbar_pos
  diff = (dialog.column + dialog.width) - screen_width
  if diff > 0
    dialog.column -= diff
  end
  if rest_height(screen_scroll_top + cursor_row) - dialog_render_info.pos.y >= height
    dialog.vertical_offset = dialog_render_info.pos.y + 1
  elsif cursor_row >= height
    dialog.vertical_offset = dialog_render_info.pos.y - height
  else
    dialog.vertical_offset = dialog_render_info.pos.y + 1
  end
  if dialog.column < 0
    dialog.column = 0
    dialog.width = screen_width
  end
  face = Reline::Face[dialog_render_info.face || :default]
  scrollbar_sgr = face[:scrollbar]
  default_sgr = face[:default]
  enhanced_sgr = face[:enhanced]
  dialog.contents = contents.map.with_index do |item, i|
    line_sgr = i == pointer ? enhanced_sgr : default_sgr
    str_width = dialog.width - (scrollbar_pos.nil? ? 0 : @block_elem_width)
    str, = Reline::Unicode.take_mbchar_range(item, 0, str_width, padding: true)
    colored_content = "#{line_sgr}#{str}"
    if scrollbar_pos
      if scrollbar_pos <= (i * 2) and (i * 2 + 1) < (scrollbar_pos + bar_height)
        colored_content + scrollbar_sgr + @full_block
      elsif scrollbar_pos <= (i * 2) and (i * 2) < (scrollbar_pos + bar_height)
        colored_content + scrollbar_sgr + @upper_half_block
      elsif scrollbar_pos <= (i * 2 + 1) and (i * 2) < (scrollbar_pos + bar_height)
        colored_content + scrollbar_sgr + @lower_half_block
      else
        colored_content + scrollbar_sgr + ' ' * @block_elem_width
      end
    else
      colored_content
    end
  end
end

# File lib/reline/line_editor.rb, line 1952
        def vi_add(key)
  @config.editing_mode = :vi_insert
  ed_next_char(key)
end

# File lib/reline/line_editor.rb, line 2048
        def vi_add_at_eol(key)
  ed_move_to_end(key)
  @config.editing_mode = :vi_insert
end

# File lib/reline/line_editor.rb, line 2067
        def vi_change_meta(key, arg: nil)
  if @vi_waiting_operator
    set_current_line('', 0) if @vi_waiting_operator == :vi_change_meta_confirm && arg.nil?
    @vi_waiting_operator = nil
    @vi_waiting_operator_arg = nil
  else
    @drop_terminate_spaces = true
    @vi_waiting_operator = :vi_change_meta_confirm
    @vi_waiting_operator_arg = arg || 1
  end
end

# File lib/reline/line_editor.rb, line 2079
        def vi_change_meta_confirm(byte_pointer_diff)
  vi_delete_meta_confirm(byte_pointer_diff)
  @config.editing_mode = :vi_insert
  @drop_terminate_spaces = false
end

# File lib/reline/line_editor.rb, line 1745
        def vi_change_to_eol(key)
  ed_kill_line(key)

  @config.editing_mode = :vi_insert
end

# File lib/reline/line_editor.rb, line 1957
        def vi_command_mode(key)
  ed_prev_char(key)
  @config.editing_mode = :vi_command
end

# File lib/reline/line_editor.rb, line 2085
        def vi_delete_meta(key, arg: nil)
  if @vi_waiting_operator
    set_current_line('', 0) if @vi_waiting_operator == :vi_delete_meta_confirm && arg.nil?
    @vi_waiting_operator = nil
    @vi_waiting_operator_arg = nil
  else
    @vi_waiting_operator = :vi_delete_meta_confirm
    @vi_waiting_operator_arg = arg || 1
  end
end

# File lib/reline/line_editor.rb, line 2096
        def vi_delete_meta_confirm(byte_pointer_diff)
  if byte_pointer_diff > 0
    line, cut = byteslice!(current_line, @byte_pointer, byte_pointer_diff)
  elsif byte_pointer_diff < 0
    line, cut = byteslice!(current_line, @byte_pointer + byte_pointer_diff, -byte_pointer_diff)
  else
    return
  end
  copy_for_vi(cut)
  set_current_line(line, @byte_pointer + (byte_pointer_diff < 0 ? byte_pointer_diff : 0))
end

# File lib/reline/line_editor.rb, line 2029
        def vi_delete_prev_char(key)
  if @byte_pointer == 0 and @line_index > 0
    @byte_pointer = @buffer_of_lines[@line_index - 1].bytesize
    @buffer_of_lines[@line_index - 1] += @buffer_of_lines.delete_at(@line_index)
    @line_index -= 1
    process_auto_indent cursor_dependent: false
  elsif @byte_pointer > 0
    byte_size = Reline::Unicode.get_prev_mbchar_size(current_line, @byte_pointer)
    @byte_pointer -= byte_size
    line, _ = byteslice!(current_line, @byte_pointer, byte_size)
    set_current_line(line)
  end
end

# File lib/reline/line_editor.rb, line 2348
        def vi_editing_mode(key)
  @config.editing_mode = :vi_insert
end

# File lib/reline/line_editor.rb, line 2014
        def vi_end_big_word(key, arg: 1, inclusive: false)
  if current_line.bytesize > @byte_pointer
    byte_size = Reline::Unicode.vi_big_forward_end_word(current_line, @byte_pointer)
    @byte_pointer += byte_size
  end
  arg -= 1
  if inclusive and arg.zero?
    byte_size = Reline::Unicode.get_next_mbchar_size(current_line, @byte_pointer)
    if byte_size > 0
      @byte_pointer += byte_size
    end
  end
  vi_end_big_word(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 1981
        def vi_end_word(key, arg: 1, inclusive: false)
  if current_line.bytesize > @byte_pointer
    byte_size = Reline::Unicode.vi_forward_end_word(current_line, @byte_pointer)
    @byte_pointer += byte_size
  end
  arg -= 1
  if inclusive and arg.zero?
    byte_size = Reline::Unicode.get_next_mbchar_size(current_line, @byte_pointer)
    if byte_size > 0
      @byte_pointer += byte_size
    end
  end
  vi_end_word(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 1456
        def vi_first_print(key)
  @byte_pointer = Reline::Unicode.vi_first_print(current_line)
end

# File lib/reline/line_editor.rb, line 2164
        def vi_histedit(key)
  path = Tempfile.open { |fp|
    fp.write whole_lines.join("\n")
    fp.path
  }
  system("#{ENV['EDITOR']} #{path}")
  @buffer_of_lines = File.read(path).split("\n")
  @buffer_of_lines = [String.new(encoding: encoding)] if @buffer_of_lines.empty?
  @line_index = 0
  finish
end

# File lib/reline/line_editor.rb, line 1948
        def vi_insert(key)
  @config.editing_mode = :vi_insert
end

# File lib/reline/line_editor.rb, line 2043
        def vi_insert_at_bol(key)
  ed_move_to_beg(key)
  @config.editing_mode = :vi_insert
end

# File lib/reline/line_editor.rb, line 2322
        def vi_join_lines(key, arg: 1)
  if @buffer_of_lines.size > @line_index + 1
    next_line = @buffer_of_lines.delete_at(@line_index + 1).lstrip
    set_current_line(current_line + ' ' + next_line, current_line.bytesize)
  end
  arg -= 1
  vi_join_lines(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 1756
        def vi_kill_line_prev(key)
  if @byte_pointer > 0
    line, deleted = byteslice!(current_line, 0, @byte_pointer)
    set_current_line(line, 0)
    @kill_ring.append(deleted, true)
  end
end

# File lib/reline/line_editor.rb, line 2130
        def vi_list_or_eof(key)
  if buffer_empty?
    @eof = true
    finish
  else
    ed_newline(key)
  end
end

# File lib/reline/line_editor.rb, line 1996
        def vi_next_big_word(key, arg: 1)
  if current_line.bytesize > @byte_pointer
    byte_size = Reline::Unicode.vi_big_forward_word(current_line, @byte_pointer)
    @byte_pointer += byte_size
  end
  arg -= 1
  vi_next_big_word(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 2234
        def vi_next_char(key, arg: 1, inclusive: false)
  @waiting_proc = ->(key_for_proc) { search_next_char(key_for_proc, arg, inclusive: inclusive) }
end

# File lib/reline/line_editor.rb, line 1963
        def vi_next_word(key, arg: 1)
  if current_line.bytesize > @byte_pointer
    byte_size = Reline::Unicode.vi_forward_word(current_line, @byte_pointer, @drop_terminate_spaces)
    @byte_pointer += byte_size
  end
  arg -= 1
  vi_next_word(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 2185
        def vi_paste_next(key, arg: 1)
  if @vi_clipboard.size > 0
    byte_size = Reline::Unicode.get_next_mbchar_size(current_line, @byte_pointer)
    line = byteinsert(current_line, @byte_pointer + byte_size, @vi_clipboard)
    set_current_line(line, @byte_pointer + @vi_clipboard.bytesize)
  end
  arg -= 1
  vi_paste_next(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 2176
        def vi_paste_prev(key, arg: 1)
  if @vi_clipboard.size > 0
    cursor_point = @vi_clipboard.grapheme_clusters[0..-2].join
    set_current_line(byteinsert(current_line, @byte_pointer, @vi_clipboard), @byte_pointer + cursor_point.bytesize)
  end
  arg -= 1
  vi_paste_prev(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 2005
        def vi_prev_big_word(key, arg: 1)
  if @byte_pointer > 0
    byte_size = Reline::Unicode.vi_big_backward_word(current_line, @byte_pointer)
    @byte_pointer -= byte_size
  end
  arg -= 1
  vi_prev_big_word(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 2281
        def vi_prev_char(key, arg: 1)
  @waiting_proc = ->(key_for_proc) { search_prev_char(key_for_proc, arg) }
end

# File lib/reline/line_editor.rb, line 1972
        def vi_prev_word(key, arg: 1)
  if @byte_pointer > 0
    byte_size = Reline::Unicode.vi_backward_word(current_line, @byte_pointer)
    @byte_pointer -= byte_size
  end
  arg -= 1
  vi_prev_word(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 2210
        def vi_replace_char(key, arg: 1)
  @waiting_proc = ->(k) {
    if arg == 1
      byte_size = Reline::Unicode.get_next_mbchar_size(current_line, @byte_pointer)
      before = current_line.byteslice(0, @byte_pointer)
      remaining_point = @byte_pointer + byte_size
      after = current_line.byteslice(remaining_point, current_line.bytesize - remaining_point)
      set_current_line(before + k + after)
      @waiting_proc = nil
    elsif arg > 1
      byte_size = 0
      arg.times do
        byte_size += Reline::Unicode.get_next_mbchar_size(current_line, @byte_pointer + byte_size)
      end
      before = current_line.byteslice(0, @byte_pointer)
      remaining_point = @byte_pointer + byte_size
      after = current_line.byteslice(remaining_point, current_line.bytesize - remaining_point)
      replaced = k * arg
      set_current_line(before + replaced + after, @byte_pointer + replaced.bytesize)
      @waiting_proc = nil
    end
  }
end

# File lib/reline/line_editor.rb, line 1582
        def vi_search_next(key)
  incremental_search_history(key)
end

# File lib/reline/line_editor.rb, line 1577
        def vi_search_prev(key)
  incremental_search_history(key)
end

# File lib/reline/line_editor.rb, line 2201
        def vi_to_column(key, arg: 0)
  # Implementing behavior of vi, not Readline's vi-mode.
  @byte_pointer, = current_line.grapheme_clusters.inject([0, 0]) { |(total_byte_size, total_width), gc|
    mbchar_width = Reline::Unicode.get_mbchar_width(gc)
    break [total_byte_size, total_width] if (total_width + mbchar_width) >= arg
    [total_byte_size + gc.bytesize, total_width + mbchar_width]
  }
end

# File lib/reline/line_editor.rb, line 2157
        def vi_to_history_line(key)
  if Reline::HISTORY.empty?
    return
  end
  move_history(0, line: :start, cursor: :start)
end

# File lib/reline/line_editor.rb, line 2238
        def vi_to_next_char(key, arg: 1, inclusive: false)
  @waiting_proc = ->(key_for_proc) { search_next_char(key_for_proc, arg, need_prev_char: true, inclusive: inclusive) }
end

# File lib/reline/line_editor.rb, line 2285
        def vi_to_prev_char(key, arg: 1)
  @waiting_proc = ->(key_for_proc) { search_prev_char(key_for_proc, arg, true) }
end

# File lib/reline/line_editor.rb, line 2108
        def vi_yank(key, arg: nil)
  if @vi_waiting_operator
    copy_for_vi(current_line) if @vi_waiting_operator == :vi_yank_confirm && arg.nil?
    @vi_waiting_operator = nil
    @vi_waiting_operator_arg = nil
  else
    @vi_waiting_operator = :vi_yank_confirm
    @vi_waiting_operator_arg = arg || 1
  end
end

# File lib/reline/line_editor.rb, line 2119
        def vi_yank_confirm(byte_pointer_diff)
  if byte_pointer_diff > 0
    cut = current_line.byteslice(@byte_pointer, byte_pointer_diff)
  elsif byte_pointer_diff < 0
    cut = current_line.byteslice(@byte_pointer + byte_pointer_diff, -byte_pointer_diff)
  else
    return
  end
  copy_for_vi(cut)
end