Class: Foruiman::TUI::InputLine

Inherits:
Object
  • Object
show all
Defined in:
lib/foruiman/tui/input_line.rb

Constant Summary collapse

MAX_BYTES =

Leave room for the newline in the child's canonical terminal buffer.

4095
HISTORY_SIZE = 
100
SEQUENCES = 
{
  "\e[A" => :history_previous, "\e[B" => :history_next,
  "\e[C" => :right, "\e[D" => :left,
  "\e[H" => :home, "\e[F" => :end,
  "\e[1~" => :home, "\e[4~" => :end, "\e[3~" => :delete
}.freeze
CONTROLS = 
{
  1 => :home, 3 => :interrupt, 4 => :eof, 5 => :end, 8 => :backspace,
  10 => :submit, 13 => :submit, 18 => :history_previous, 21 => :clear, 23 => :delete_word,
  24 => :detach, 127 => :backspace
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ InputLine

Returns a new instance of InputLine.



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# File 'lib/foruiman/tui/input_line.rb', line 22

def initialize
  @text = +""
  @cursor = 0
  @bytes = +"".b
  @history = []
  @history_index = nil
  @draft = nil
end

Instance Attribute Details

#cursor ⇒ Object (readonly)

Returns the value of attribute cursor.



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# File 'lib/foruiman/tui/input_line.rb', line 20

def cursor
  @cursor
end

#text ⇒ Object (readonly)

Returns the value of attribute text.



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# File 'lib/foruiman/tui/input_line.rb', line 20

def text
  @text
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/foruiman/tui/input_line.rb', line 82

def clear
  replace("")
  @history_index = nil
  @draft = nil
end

#feed(bytes) ⇒ Object 



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# File 'lib/foruiman/tui/input_line.rb', line 31

def feed(bytes)
  bytes, detach, = bytes.b.partition("\x18")
  @bytes << bytes
  events = []
  until @bytes.empty?
    if @bytes.start_with?("\e")
      if @bytes.bytesize > 64 && incomplete_escape?
        @bytes.clear
        break
      end
      break if incomplete_escape?

      sequence = SEQUENCES.keys.find { |candidate| @bytes.start_with?(candidate) }
      if sequence
        edit(SEQUENCES.fetch(sequence))
        @bytes.slice!(0, sequence.bytesize)
      else
        match = @bytes.match(%r{\A\e(?:\[[0-?]*[ -/]*[@-~]|O.|.)}m)
        @bytes.slice!(0, match ? match[0].bytesize : 1)
      end
      next
    end

    byte = @bytes.getbyte(0)
    if @after_cr && byte == 10
      @bytes.slice!(0, 1)
      @after_cr = false
      next
    end
    @after_cr = byte == 13
    if CONTROLS.key?(byte)
      @bytes.slice!(0, 1)
      event = edit(CONTROLS.fetch(byte))
      events << event if event
    elsif byte < 32
      @bytes.slice!(0, 1)
    else
      character = next_character
      break unless character

      insert(character)
    end
  end
  unless detach.empty?
    @bytes.clear
    clear
    events << :detach
  end
  events
end