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Class: Reline::ANSI

Relationships & Source Files
Inherits: Object
Defined in: lib/reline/ansi.rb

Constant Summary

  • RAW_KEYSTROKE_CONFIG =
    # File 'lib/reline/ansi.rb', line 12 
    {
  # Console (80x25)
  [27, 91, 49, 126] => :ed_move_to_beg, # Home
  [27, 91, 52, 126] => :ed_move_to_end, # End
  [27, 91, 51, 126] => :key_delete,     # Del
  [27, 91, 65] => :ed_prev_history,     # ↑
  [27, 91, 66] => :ed_next_history,     # ↓
  [27, 91, 67] => :ed_next_char,        # →
  [27, 91, 68] => :ed_prev_char,        # ←

  # KDE
  [27, 91, 72] => :ed_move_to_beg,      # Home
  [27, 91, 70] => :ed_move_to_end,      # End
  # Del is 0x08
  [27, 71, 65] => :ed_prev_history,     # ↑
  [27, 71, 66] => :ed_next_history,     # ↓
  [27, 71, 67] => :ed_next_char,        # →
  [27, 71, 68] => :ed_prev_char,        # ←

  # urxvt / exoterm
  [27, 91, 55, 126] => :ed_move_to_beg, # Home
  [27, 91, 56, 126] => :ed_move_to_end, # End

  # GNOME
  [27, 79, 72] => :ed_move_to_beg,      # Home
  [27, 79, 70] => :ed_move_to_end,      # End
  # Del is 0x08
  # Arrow keys are the same of KDE

  # iTerm2
  [27, 27, 91, 67] => :em_next_word,    # Option+→
  [27, 27, 91, 68] => :ed_prev_word,    # Option+←
  [195, 166] => :em_next_word,          # Option+f
  [195, 162] => :ed_prev_word,          # Option+b

  # others
  [27, 32] => :em_set_mark,             # M-<space>
  [24, 24] => :em_exchange_mark,        # C-x C-x TODO also add Windows
  [27, 91, 49, 59, 53, 67] => :em_next_word, # Ctrl+→
  [27, 91, 49, 59, 53, 68] => :ed_prev_word, # Ctrl+←

  [27, 79, 65] => :ed_prev_history,     # ↑
  [27, 79, 66] => :ed_next_history,     # ↓
  [27, 79, 67] => :ed_next_char,        # →
  [27, 79, 68] => :ed_prev_char,        # ←
}

Class Attribute Summary

Class Method Summary

Class Attribute Details

.input=(val) (writeonly)

[ GitHub ] 

  


# File 'lib/reline/ansi.rb', line 60



def self.input=(val)
  @@input = val
end


  








  

    .output=(val)   (writeonly)
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 65



def self.output=(val)
  @@output = val
end


  








  

    .win?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 8



def self.win?
  false
end


  







Class Method Details



  

    .clear_screen  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 180



def self.clear_screen
  @@output.write "\e[2J"
  @@output.write "\e[1;1H"
end


  








  

    .cursor_pos  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 116



def self.cursor_pos
  begin
    res = ''
    m = nil
    @@input.raw do |stdin|
      @@output << "\e[6n"
      @@output.flush
      loop do
        c = stdin.getc
        next if c.nil?
        res << c
        m = res.match(/\e\[(?<row>\d);(?<column>\d)R/)
        break if m
      end
      (m.pre_match + m.post_match).chars.reverse_each do |ch|
        stdin.ungetc ch
      end
    end
    column = m[:column].to_i - 1
    row = m[:row].to_i - 1
  rescue Errno::ENOTTY
    begin
      buf = @@output.pread(@@output.pos, 0)
      row = buf.count("\n")
      column = buf.rindex("\n") ? (buf.size - buf.rindex("\n")) - 1 : 0
    rescue Errno::ESPIPE
      # Just returns column 1 for ambiguous width because this I/O is not
      # tty and can't seek.
      row = 0
      column = 1
    end
  end
  Reline::CursorPos.new(column, row)
end


  








  

    .deprep(otio)  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 197



def self.deprep(otio)
  int_handle = Signal.trap('INT', 'IGNORE')
  Signal.trap('INT', int_handle)
  Signal.trap('WINCH', @@old_winch_handler) if @@old_winch_handler
end


  








  

    .encoding  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 4



def self.encoding
  Encoding.default_external
end


  








  

    .erase_after_cursor  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 171



def self.erase_after_cursor
  @@output.write "\e[K"
end


  








  

    .get_screen_size  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 99



def self.get_screen_size
  s = @@input.winsize
  return s if s[0] > 0 && s[1] > 0
  s = [ENV["LINES"].to_i, ENV["COLUMNS"].to_i]
  return s if s[0] > 0 && s[1] > 0
  [24, 80]
rescue Errno::ENOTTY
  [24, 80]
end


  








  

    .getc  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 70



def self.getc
  unless @@buf.empty?
    return @@buf.shift
  end
  until c = @@input.raw(intr: true, &:getbyte)
    sleep 0.1
  end
  (c == 0x16 && @@input.raw(min: 0, tim: 0, &:getbyte)) || c
rescue Errno::EIO
  # Maybe the I/O has been closed.
  nil
end


  








  

    .move_cursor_column(x)  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 151



def self.move_cursor_column(x)
  @@output.write "\e[#{x + 1}G"
end


  








  

    .move_cursor_down(x)  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 163



def self.move_cursor_down(x)
  if x > 0
    @@output.write "\e[#{x}B" if x > 0
  elsif x < 0
    move_cursor_up(-x)
  end
end


  








  

    .move_cursor_up(x)  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 155



def self.move_cursor_up(x)
  if x > 0
    @@output.write "\e[#{x}A" if x > 0
  elsif x < 0
    move_cursor_down(-x)
  end
end


  








  

    .prep  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 190



def self.prep
  retrieve_keybuffer
  int_handle = Signal.trap('INT', 'IGNORE')
  Signal.trap('INT', int_handle)
  nil
end


  








  

    .retrieve_keybuffer  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 87



def self.retrieve_keybuffer
  begin
    result = select([@@input], [], [], 0.001)
    return if result.nil?
    str = @@input.read_nonblock(1024)
    str.bytes.each do |c|
      @@buf.push(c)
    end
  rescue EOFError
  end
end


  








  

    .scroll_down(x)  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 175



def self.scroll_down(x)
  return if x.zero?
  @@output.write "\e[#{x}S"
end


  








  

    .set_screen_size(rows, columns)  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 109



def self.set_screen_size(rows, columns)
  @@input.winsize = [rows, columns]
  self
rescue Errno::ENOTTY
  self
end


  








  

    .set_winch_handler(&handler)  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 186



def self.set_winch_handler(&handler)
  @@old_winch_handler = Signal.trap('WINCH', &handler)
end


  








  

    .ungetc(c)  
  

  [ GitHub ]


  

  


# File 'lib/reline/ansi.rb', line 83



def self.ungetc(c)
  @@buf.unshift(c)
end