Class: Textbringer::Window

Inherits:
Object
  • Object
show all
Defined in:
lib/textbringer/window.rb,
lib/textbringer/window/fallback_characters.rb

Direct Known Subclasses

EchoArea

Defined Under Namespace

Classes: Cursor

Constant Summary collapse

KEY_NAMES = 
{}
HAVE_GET_KEY_MODIFIERS = 
defined?(Curses.get_key_modifiers)
ALT_NUMBER_BASE = 
Curses::ALT_0 - ?0.ord
ALT_ALPHA_BASE = 
Curses::ALT_A - ?a.ord
FALLBACK_CHARACTERS = 
{
  # Diacritical marks
  ## https://www.unicode.org/charts/PDF/U0300.pdf
  ## characters combinable with alphabet:
  ## ("\u{0300}".."\u{036f}").filter { |c|
  ##   ("a".."z").any? { |c2|
  ##     "#{c2}#{c}".unicode_normalize(:nfc).size == 1
  ##   }
  ## }
  "̀" => "`",
  "́" => "´",
  "̂" => "ˆ",
  "̃" => "˜",
  "̄" => "¯",
  "̆" => "˘",
  "̇" => "˙",
  "̈" => "¨",
  "̉" => "ˀ",
  "̊" => "˚",
  "̋" => "˝",
  "̌" => "ˇ",
  "̏" => '"',
  "̑" => nil, # combining character only
  "̛" => nil, # combining character only
  "̣" => nil, # combining character only
  "̤" => nil, # combining character only
  "̥" => "˳",
  "̦" => ",",
  "̧" => "¸",
  "̨" => "˛",
  "̭" => nil, # combining character only
  "̮" => nil, # combining character only
  "̰" => nil, # combining character only
  "̱" => "ˍ",
  "̀" => nil, # combining character only
  "́" => nil, # combining character only
  "̈́" => nil, # combining character only

  # Hiragana
  "゙" => "゛",
  "゚" => "゜",

  # Hangul jamo
  ## initial
  "ᄀ" => "ㄱ",
  "ᄁ" => "ㄲ",
  "ᄂ" => "ㄴ",
  "ᄃ" => "ㄷ",
  "ᄄ" => "ㄸ",
  "ᄅ" => "ㄹ",
  "ᄆ" => "ㅁ",
  "ᄇ" => "ㅂ",
  "ᄈ" => "ㅃ",
  "ᄉ" => "ㅅ",
  "ᄊ" => "ㅆ",
  "ᄋ" => "ㅇ",
  "ᄌ" => "ㅈ",
  "ᄍ" => "ㅉ",
  "ᄎ" => "ㅊ",
  "ᄏ" => "ㅋ",
  "ᄐ" => "ㅌ",
  "ᄑ" => "ㅍ",
  "ᄒ" => "ㅎ",
  ## medial
  "ᅡ" => "ㅏ",
  "ᅢ" => "ㅐ",
  "ᅣ" => "ㅑ",
  "ᅤ" => "ㅒ",
  "ᅥ" => "ㅓ",
  "ᅦ" => "ㅔ",
  "ᅧ" => "ㅕ",
  "ᅨ" => "ㅖ",
  "ᅩ" => "ㅗ",
  "ᅪ" => "ㅘ",
  "ᅫ" => "ㅙ",
  "ᅬ" => "ㅚ",
  "ᅭ" => "ㅛ",
  "ᅮ" => "ㅜ",
  "ᅯ" => "ㅝ",
  "ᅰ" => "ㅞ",
  "ᅱ" => "ㅟ",
  "ᅲ" => "ㅠ",
  "ᅳ" => "ㅡ",
  "ᅴ" => "ㅢ",
  "ᅵ" => "ㅣ",
  ## final
  "ᆨ" => "ㄱ",
  "ᆩ" => "ㄲ",
  "ᆪ" => "ㄳ",
  "ᆫ" => "ㄴ",
  "ᆬ" => "ㄵ",
  "ᆭ" => "ㄶ",
  "ᆮ" => "ㄷ",
  "ᆯ" => "ㄹ",
  "ᆰ" => "ㄺ",
  "ᆱ" => "ㄻ",
  "ᆲ" => "ㄼ",
  "ᆳ" => "ㄽ",
  "ᆴ" => "ㄾ",
  "ᆵ" => "ㄿ",
  "ᆶ" => "ㅀ",
  "ᆷ" => "ㅁ",
  "ᆸ" => "ㅂ",
  "ᆹ" => "ㅄ",
  "ᆺ" => "ㅅ",
  "ᆻ" => "ㅆ",
  "ᆼ" => "ㅇ",
  "ᆽ" => "ㅈ",
  "ᆾ" => "ㅊ",
  "ᆿ" => "ㅋ",
  "ᇀ" => "ㅌ",
  "ᇁ" => "ㅍ",
  "ᇂ" => "ㅎ"
}
@@started = 
false
@@list = 
[]
@@current = 
nil
@@echo_area = 
nil
@@has_colors = 
false

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(lines, columns, y, x) ⇒ Window

Returns a new instance of Window.



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# File 'lib/textbringer/window.rb', line 222

def initialize(lines, columns, y, x)
  @lines = lines
  @columns = columns
  @y = y
  @x = x
  initialize_window(lines, columns, y, x)
  @window.keypad = true
  @window.scrollok(false)
  @window.idlok(true)
  @buffer = nil
  @top_of_window = nil
  @bottom_of_window = nil
  @point_mark = nil
  @deleted = false
  @raw_key_buffer = []
  @key_buffer = []
  @cursor = Cursor.new(0, 0)
  @in_region = false
  @in_isearch = false
  @current_highlight_attrs = 0
end

Instance Attribute Details

#bottom_of_window ⇒ Object (readonly)

Returns the value of attribute bottom_of_window.



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# File 'lib/textbringer/window.rb', line 220

def bottom_of_window
  @bottom_of_window
end

#buffer ⇒ Object

Returns the value of attribute buffer.



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# File 'lib/textbringer/window.rb', line 219

def buffer
  @buffer
end

#columns ⇒ Object (readonly)

Returns the value of attribute columns.



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# File 'lib/textbringer/window.rb', line 219

def columns
  @columns
end

#lines ⇒ Object (readonly)

Returns the value of attribute lines.



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# File 'lib/textbringer/window.rb', line 219

def lines
  @lines
end

#mode_line ⇒ Object (readonly)

Returns the value of attribute mode_line.



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# File 'lib/textbringer/window.rb', line 219

def mode_line
  @mode_line
end

#top_of_window ⇒ Object (readonly)

Returns the value of attribute top_of_window.



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# File 'lib/textbringer/window.rb', line 220

def top_of_window
  @top_of_window
end

#window ⇒ Object (readonly)

Returns the value of attribute window.



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# File 'lib/textbringer/window.rb', line 219

def window
  @window
end

#x ⇒ Object (readonly)

Returns the value of attribute x.



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# File 'lib/textbringer/window.rb', line 219

def x
  @x
end

#y ⇒ Object (readonly)

Returns the value of attribute y.



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# File 'lib/textbringer/window.rb', line 219

def y
  @y
end

Class Method Details

.beep ⇒ Object 



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# File 'lib/textbringer/window.rb', line 215

def self.beep
  Curses.beep
end

.colors ⇒ Object 



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# File 'lib/textbringer/window.rb', line 108

def self.colors
  Curses.colors
end

.columns ⇒ Object 



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# File 'lib/textbringer/window.rb', line 188

def self.columns
  Curses.cols
end

.current ⇒ Object 



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# File 'lib/textbringer/window.rb', line 34

def self.current
  @@current
end

.current=(window) ⇒ Object 



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# File 'lib/textbringer/window.rb', line 38

def self.current=(window)
  if window.deleted?
    window = @@list.first
  end
  @@current.save_point if @@current && !@@current.deleted?
  @@current = window
  @@current.restore_point
  Buffer.current = window.buffer
end

.delete_other_windows ⇒ Object 



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# File 'lib/textbringer/window.rb', line 71

def self.delete_other_windows
  if @@current.echo_area?
    raise EditorError, "Can't expand the echo area to full screen"
  end
  @@list.delete_if do |window|
    if window.current? || window.echo_area?
      false
    else
      window.delete
      true
    end
  end
  @@current.move(0, 0)
  @@current.resize(Window.lines - 1, @@current.columns)
end

.delete_window(target = @@current) ⇒ Object 



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# File 'lib/textbringer/window.rb', line 48

def self.delete_window(target = @@current)
  if target.echo_area?
    raise EditorError, "Can't delete the echo area"
  end
  if @@list.size == 2
    raise EditorError, "Can't delete the sole window"
  end
  i = @@list.index(target)
  return if i.nil?
  if i == 0
    window = @@list[1]
    window.move(0, 0)
  else
    window = @@list[i - 1]
  end
  window.resize(target.lines + window.lines, window.columns)
  target.delete
  @@list.delete_at(i)
  if target == @@current
    self.current = window
  end
end

.echo_area ⇒ Object 



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# File 'lib/textbringer/window.rb', line 96

def self.echo_area
  @@echo_area
end

.has_colors=(value) ⇒ Object 



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# File 'lib/textbringer/window.rb', line 100

def self.has_colors=(value)
  @@has_colors = value
end

.has_colors? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/window.rb', line 104

def self.has_colors?
  @@has_colors
end

.lines ⇒ Object 



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# File 'lib/textbringer/window.rb', line 184

def self.lines
  Curses.lines
end

.list(include_echo_area: false) ⇒ Object 



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# File 'lib/textbringer/window.rb', line 26

def self.list(include_echo_area: false)
  if include_echo_area
    @@list.dup
  else
    @@list.reject(&:echo_area?)
  end
end

.load_faces ⇒ Object 



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# File 'lib/textbringer/window.rb', line 117

def self.load_faces
  require_relative "faces/basic"
  require_relative "faces/programming"
end

.other_window ⇒ Object 



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# File 'lib/textbringer/window.rb', line 87

def self.other_window
  i = @@list.index(@@current)
  begin
    i += 1
    window = @@list[i % @@list.size]
  end while !window.active?
  self.current = window
end

.redisplay ⇒ Object 



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# File 'lib/textbringer/window.rb', line 162

def self.redisplay
  return if Controller.current.executing_keyboard_macro?
  return if Window.current.has_input?
  @@list.each do |window|
    window.redisplay unless window.current?
  end
  current.redisplay
  update
end

.redraw ⇒ Object 



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# File 'lib/textbringer/window.rb', line 172

def self.redraw
  @@list.each do |window|
    window.redraw unless window.current?
  end
  current.redraw
  update
end

.resize ⇒ Object 



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# File 'lib/textbringer/window.rb', line 192

def self.resize
  @@list.delete_if do |window|
    if !window.echo_area? &&
        window.y > Window.lines - CONFIG[:window_min_height]
      window.delete
      true
    else
      false
    end
  end
  @@list.each_with_index do |window, i|
    unless window.echo_area?
      if i < @@list.size - 2
        window.resize(window.lines, Window.columns)
      else
        window.resize(Window.lines - 1 - window.y, Window.columns)
      end
    end
  end
  @@echo_area.move(Window.lines - 1, 0)
  @@echo_area.resize(1, Window.columns)
end

.set_default_colors(fg, bg) ⇒ Object 



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# File 'lib/textbringer/window.rb', line 112

def self.set_default_colors(fg, bg)
  Curses.assume_default_colors(Color[fg], Color[bg])
  Window.redraw
end

.start ⇒ Object 



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# File 'lib/textbringer/window.rb', line 122

def self.start
  if @@started
    raise EditorError, "Already started"
  end
  Curses.init_screen
  Curses.noecho
  Curses.raw
  Curses.nonl
  self.has_colors = Curses.has_colors?
  if has_colors?
    Curses.start_color
    Curses.use_default_colors
    load_faces
  end
  begin
    window =
      Textbringer::Window.new(Window.lines - 1, Window.columns, 0, 0)
    window.buffer = Buffer.new_buffer("*scratch*")
    @@list.push(window)
    Window.current = window
    @@echo_area = Textbringer::EchoArea.new(1, Window.columns,
                                            Window.lines - 1, 0)
    Buffer.minibuffer.keymap = MINIBUFFER_LOCAL_MAP
    @@echo_area.buffer = Buffer.minibuffer
    @@list.push(@@echo_area)
    @@started = true
    yield
  ensure
    @@list.each do |win|
      win.close
    end
    @@list.clear
    Curses.echo
    Curses.noraw
    Curses.nl
    Curses.close_screen
    @@started = false
  end
end

.update ⇒ Object 



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# File 'lib/textbringer/window.rb', line 180

def self.update
  Curses.doupdate
end

Instance Method Details

#active? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/window.rb', line 248

def active?
  true
end

#close ⇒ Object 



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# File 'lib/textbringer/window.rb', line 267

def close
  @window.close
end

#current? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/window.rb', line 297

def current?
  self == @@current
end

#delete ⇒ Object 



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# File 'lib/textbringer/window.rb', line 256

def delete
  unless @deleted
    if current?
      Window.current = @@list.first
    end
    delete_marks
    @window.close
    @deleted = true
  end
end

#deleted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/window.rb', line 252

def deleted?
  @deleted
end

#echo_area? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/window.rb', line 244

def echo_area?
  false
end

#enlarge(n) ⇒ Object 



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# File 'lib/textbringer/window.rb', line 596

def enlarge(n)
  if n > 0
    max_height = Window.lines -
      CONFIG[:window_min_height] * (@@list.size - 2) - 1
    new_lines = [lines + n, max_height].min
    needed_lines = new_lines - lines
    resize(new_lines, columns)
    i = @@list.index(self)
    indices = (i + 1).upto(@@list.size - 2).to_a +
      (i - 1).downto(0).to_a
    indices.each do |j|
      break if needed_lines == 0
      window = @@list[j]
      extended_lines = [
        window.lines - CONFIG[:window_min_height],
        needed_lines
      ].min
      window.resize(window.lines - extended_lines, window.columns)
      needed_lines -= extended_lines
    end
    y = 0
    @@list.each do |win|
      win.move(y, win.x)
      y += win.lines
    end
  elsif n < 0 && @@list.size > 2
    new_lines = [lines + n, CONFIG[:window_min_height]].max
    diff = lines - new_lines
    resize(new_lines, columns)
    i = @@list.index(self)
    if i < @@list.size - 2
      window = @@list[i + 1]
      window.move(window.y - diff, window.x)
    else
      window = @@list[i - 1]
      move(self.y + diff, self.x)
    end
    window.resize(window.lines + diff, window.columns)
  end
end

#has_input? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/window.rb', line 344

def has_input?
  if !@raw_key_buffer.empty? || !@key_buffer.empty?
    return true
  end
  @window.nodelay = true
  begin
    c = @window.get_char
    if c
      @raw_key_buffer.push(c)
    end
    !c.nil?
  ensure
    @window.nodelay = false
  end
end

#highlight ⇒ Object 



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# File 'lib/textbringer/window.rb', line 360

def highlight
  @highlight_on = {}
  @highlight_off = {}
  return if !@@has_colors || !CONFIG[:syntax_highlight] || @buffer.binary?
  syntax_table = @buffer.mode.syntax_table || DEFAULT_SYNTAX_TABLE
  if @buffer.bytesize < CONFIG[:highlight_buffer_size_limit]
    base_pos = @buffer.point_min
    s = @buffer.to_s
  else
    base_pos = @buffer.point
    len = columns * (lines - 1) / 2 * 3
    s = @buffer.substring(@buffer.point, @buffer.point + len).scrub("")
  end
  return if !s.valid_encoding?
  re_str = syntax_table.map { |name, re|
    "(?<#{name}>#{re})"
  }.join("|")
  re = Regexp.new(re_str)
  names = syntax_table.keys
  s.scan(re) do
    b = base_pos + $`.bytesize
    e = b + $&.bytesize
    if b < @buffer.point && @buffer.point < e
      b = @buffer.point
    end
    name = names.find { |n| $~[n] }
    attributes = Face[name]&.attributes
    if attributes
      @highlight_on[b] = attributes
      @highlight_off[e] = attributes
    end
  end
end

#move(y, x) ⇒ Object 



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# File 'lib/textbringer/window.rb', line 521

def move(y, x)
  @y = y
  @x = x
  @window.move(y, x)
  @mode_line.move(y + @window.maxy, x)
end

#read_event ⇒ Object 



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# File 'lib/textbringer/window.rb', line 301

def read_event
  key = get_char
  if key.is_a?(Integer)
    if HAVE_GET_KEY_MODIFIERS
      if Curses::ALT_0 <= key && key <= Curses::ALT_9
        @key_buffer.push((key - ALT_NUMBER_BASE).chr)
        return "\e"
      elsif Curses::ALT_A <= key && key <= Curses::ALT_Z
        @key_buffer.push((key - ALT_ALPHA_BASE).chr)
        return "\e"
      end
    end
    KEY_NAMES[key] || key
  else
    key&.encode(Encoding::UTF_8)
  end
end

#read_event_nonblock ⇒ Object 



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# File 'lib/textbringer/window.rb', line 319

def read_event_nonblock
  @window.nodelay = true
  begin
    read_event
  ensure
    @window.nodelay = false
  end
end

#recenter ⇒ Object 



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# File 'lib/textbringer/window.rb', line 536

def recenter
  @buffer.save_point do |saved|
    max = (lines - 1) / 2
    count = beginning_of_line_and_count(max)
    while count < max
      break if @buffer.point == 0
      @buffer.backward_char
      count += beginning_of_line_and_count(max - count - 1) + 1
    end
    @buffer.mark_to_point(@top_of_window)
  end
end

#recenter_if_needed ⇒ Object 



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# File 'lib/textbringer/window.rb', line 549

def recenter_if_needed
  if @buffer.point_before_mark?(@top_of_window) ||
     @buffer.point_after_mark?(@bottom_of_window)
    recenter
  end
end

#redisplay ⇒ Object 



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# File 'lib/textbringer/window.rb', line 394

def redisplay
  return if @buffer.nil?
  redisplay_mode_line
  @buffer.save_point do |saved|
    if current?
      point = saved
    else
      point = @point_mark
      @buffer.point_to_mark(@point_mark)
    end
    framer
    @cursor.y = @cursor.x = 0
    @buffer.point_to_mark(@top_of_window)
    highlight
    @window.erase
    @window.setpos(0, 0)
    @window.attrset(0)
    @in_region = false
    @in_isearch = false
    @current_highlight_attrs = 0
    if current? && @buffer.visible_mark &&
       @buffer.point_after_mark?(@buffer.visible_mark)
      @window.attron(region_attr)
      @in_region = true
    end
    if current? && @buffer.isearch_mark &&
       @buffer.point_after_mark?(@buffer.isearch_mark)
      # If already in region, switch to isearch (priority)
      if @in_region
        @window.attroff(region_attr)
      end
      @window.attron(isearch_attr)
      @in_isearch = true
    end
    while !@buffer.end_of_buffer?
      cury = @window.cury
      curx = @window.curx
      update_cursor_and_attr(point, cury, curx)
      if attrs = @highlight_off[@buffer.point]
        if @in_region || @in_isearch
          # In region: only turn off non-color attributes (bold, underline, etc.)
          @window.attroff(attrs & ~Curses::A_COLOR)
        else
          @window.attroff(attrs)
        end
        @current_highlight_attrs = 0
      end
      if attrs = @highlight_on[@buffer.point]
        if @in_region || @in_isearch
          # In region: only turn on non-color attributes (preserve region background)
          @window.attron(attrs & ~Curses::A_COLOR)
        else
          @window.attron(attrs)
        end
        @current_highlight_attrs = attrs
      end
      c = @buffer.char_after
      if c == "\n"
        # Fill to end of line with region background if in region
        if @in_region
          remaining = columns - curx
          @window.addstr(" " * remaining) if remaining > 0
        else
          @window.clrtoeol
        end
        break if cury == lines - 2   # lines include mode line
        @window.setpos(cury + 1, 0)
        @buffer.forward_char
        next
      elsif c == "\t"
        n = calc_tab_width(curx)
        c = " " * n
      else
        c = compose_character(point, cury, curx, c)
      end
      s = escape(c)
      if curx < columns - 4
        newx = nil
      else
        newx = curx + Buffer.display_width(s)
        if newx > columns
          if cury == lines - 2
            break
          else
            # Fill to end of line with region background if in region
            if @in_region
              remaining = columns - curx
              @window.addstr(" " * remaining) if remaining > 0
            else
              @window.clrtoeol
            end
            @window.setpos(cury + 1, 0)
          end
        end
      end
      @window.addstr(s)
      break if newx == columns && cury == lines - 2
      @buffer.forward_char
    end
    if current? && @buffer.isearch_mark
      @window.attroff(isearch_attr)
    end
    if current? && @buffer.visible_mark
      @window.attroff(region_attr)
    end
    @buffer.mark_to_point(@bottom_of_window)
    if @buffer.point_at_mark?(point)
      @cursor.y = @window.cury
      @cursor.x = @window.curx
    end
    if @cursor.x == columns - 1
      c = @buffer.char_after(point.location)
      if c && Buffer.display_width(c) > 1
        @cursor.y += 1
        @cursor.x = 0
      end
    end
    @window.setpos(@cursor.y, @cursor.x)
    @window.noutrefresh
  end
end

#redraw ⇒ Object 



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# File 'lib/textbringer/window.rb', line 516

def redraw
  @window.redraw
  @mode_line.redraw
end

#resize(lines, columns) ⇒ Object 



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# File 'lib/textbringer/window.rb', line 528

def resize(lines, columns)
  @lines = lines
  @columns = columns
  @window.resize(lines - 1, columns)
  @mode_line.move(@y + lines - 1, @x)
  @mode_line.resize(1, columns)
end

#restore_point ⇒ Object 



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# File 'lib/textbringer/window.rb', line 293

def restore_point
  @buffer.point_to_mark(@point_mark)
end

#save_point ⇒ Object 



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# File 'lib/textbringer/window.rb', line 285

def save_point
  @buffer[:top_of_window] ||= @buffer.new_mark
  @buffer[:top_of_window].location = @top_of_window.location
  @buffer[:bottom_of_window] ||= @buffer.new_mark
  @buffer[:bottom_of_window].location = @bottom_of_window.location
  @buffer.mark_to_point(@point_mark)
end

#scroll_down ⇒ Object 



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# File 'lib/textbringer/window.rb', line 566

def scroll_down
  if @top_of_window.location == @buffer.point_min
    raise RangeError, "Beginning of buffer"
  end
  @buffer.point_to_mark(@top_of_window)
  @buffer.next_line
  @buffer.beginning_of_line
  @top_of_window.location = 0
end

#scroll_up ⇒ Object 



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# File 'lib/textbringer/window.rb', line 556

def scroll_up
  if @bottom_of_window.location == @buffer.point_max
    raise RangeError, "End of buffer"
  end
  @buffer.point_to_mark(@bottom_of_window)
  @buffer.previous_line
  @buffer.beginning_of_line
  @buffer.mark_to_point(@top_of_window)
end

#shrink(n) ⇒ Object 



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# File 'lib/textbringer/window.rb', line 637

def shrink(n)
  enlarge(-n)
end

#shrink_if_larger_than_buffer ⇒ Object 



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# File 'lib/textbringer/window.rb', line 641

def shrink_if_larger_than_buffer
  @buffer.save_point do
    @buffer.end_of_buffer
    @buffer.skip_re_backward(/\s/)
    count = beginning_of_line_and_count(Window.lines) + 1
    while !@buffer.beginning_of_buffer?
      @buffer.backward_char
      count += beginning_of_line_and_count(Window.lines) + 1
    end
    if lines - 1 > count
      shrink(lines - 1 - count)
    end
  end
end

#split(other_lines = nil) ⇒ Object 



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# File 'lib/textbringer/window.rb', line 576

def split(other_lines = nil)
  old_lines = lines
  if other_lines
    if other_lines < CONFIG[:window_min_height]
      raise EditorError, "Window too small"
    end
    new_lines = lines - other_lines
  else
    new_lines = (old_lines / 2.0).ceil
  end
  if new_lines < CONFIG[:window_min_height]
    raise EditorError, "Window too small"
  end
  resize(new_lines, columns)
  new_window = Window.new(old_lines - new_lines, columns, y + new_lines, x)
  new_window.buffer = buffer
  i = @@list.index(self)
  @@list.insert(i + 1, new_window)
end

#wait_input(msecs) ⇒ Object 



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# File 'lib/textbringer/window.rb', line 328

def wait_input(msecs)
  if !@raw_key_buffer.empty? || !@key_buffer.empty?
    return @raw_key_buffer.first || @key_buffer.first
  end
  @window.timeout = msecs
  begin
    c = @window.get_char
    if c
      @raw_key_buffer.push(c)
    end
    c
  ensure
    @window.timeout = -1
  end
end