Class: Muxr::InputHandler

Inherits:
Object
  • Object
show all
Defined in:
lib/muxr/input_handler.rb

Overview

Translates raw keystrokes into either commands (when the Ctrl-a prefix is active) or passthrough bytes to the focused pane. The handler is a small state machine: :idle → :prefix → :idle, with a separate :command branch for the “:”-driven mini-command line.

Constant Summary collapse

PREFIX =

Ctrl-a

"\x01".freeze
PREFIX_BINDINGS = 
{
  "c"    => :new_pane,
  "n"    => :focus_next,
  "p"    => :focus_prev,
  "a"    => :focus_last,
  "k"    => :close_focused,
  "\t"   => :cycle_layout,
  "\r"   => :promote_master,
  "\n"   => :promote_master,
  "~"    => :toggle_drawer,
  "d"    => :detach,
  "?"    => :show_help,
  "q"    => :quit_immediate,
  "["    => :enter_scrollback,
  "]"    => :paste_from_buffer
}.freeze
SCROLLBACK_BINDINGS = 
{
  "j"    => :line_forward,
  "k"    => :line_back,
  "\x04" => :half_forward, # Ctrl-d
  "\x15" => :half_back,    # Ctrl-u
  "d"    => :half_forward,
  "u"    => :half_back,
  "\x06" => :full_forward, # Ctrl-f
  "\x02" => :full_back,    # Ctrl-b
  "f"    => :full_forward,
  "b"    => :full_back,
  " "    => :full_forward,
  "g"    => :top,
  "G"    => :bottom
}.freeze
SCROLLBACK_EXITS =

q, Esc, Ctrl-c

["q", "\e", "\x03"].freeze
SELECTION_BINDINGS = 
{
  "h"    => :left,
  "l"    => :right,
  "j"    => :down,
  "k"    => :up,
  "0"    => :line_start,
  "$"    => :line_end,
  "^"    => :line_first_nonblank,
  "g"    => :top,
  "G"    => :bottom,
  "H"    => :screen_top,
  "M"    => :screen_middle,
  "L"    => :screen_bottom,
  "w"    => :word_forward,
  "W"    => :word_forward_big,
  "e"    => :word_end,
  "E"    => :word_end_big,
  # `b` is vim word-back here; the tmux-style page-back alias lives on Ctrl-b.
  "b"    => :word_backward,
  "B"    => :word_backward_big,
  "\x04" => :half_down, # Ctrl-d
  "\x15" => :half_up,   # Ctrl-u
  "d"    => :half_down,
  "u"    => :half_up,
  "\x06" => :full_down, # Ctrl-f
  "\x02" => :full_up,   # Ctrl-b
  "f"    => :full_down,
  " "    => :full_down
}.freeze
SELECTION_YANK = 
["\r", "\n", "y"].freeze
SELECTION_CANCEL =

q, Esc, Ctrl-c

["q", "\e", "\x03"].freeze
DIGIT_RE = 
/\A[1-9]\z/.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ InputHandler

Returns a new instance of InputHandler.



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# File 'lib/muxr/input_handler.rb', line 81

def initialize(app)
  @app = app
  @state = :idle
  @command_buffer = +""
end

Instance Attribute Details

#command_buffer ⇒ Object (readonly)

Returns the value of attribute command_buffer.



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# File 'lib/muxr/input_handler.rb', line 79

def command_buffer
  @command_buffer
end

#state ⇒ Object (readonly)

Returns the value of attribute state.



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# File 'lib/muxr/input_handler.rb', line 79

def state
  @state
end

Instance Method Details

#cancel ⇒ Object 



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# File 'lib/muxr/input_handler.rb', line 146

def cancel
  @state = :idle
  @command_buffer = +""
end

#enter_confirm_quit ⇒ Object 



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# File 'lib/muxr/input_handler.rb', line 130

def enter_confirm_quit
  @state = :confirm_quit
end

#enter_help_mode ⇒ Object 



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# File 'lib/muxr/input_handler.rb', line 126

def enter_help_mode
  @state = :help
end

#enter_idle_mode ⇒ Object 



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# File 'lib/muxr/input_handler.rb', line 142

def enter_idle_mode
  @state = :idle
end

#enter_scrollback_mode ⇒ Object 



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# File 'lib/muxr/input_handler.rb', line 134

def enter_scrollback_mode
  @state = :scrollback
end

#enter_selection_mode ⇒ Object 



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# File 'lib/muxr/input_handler.rb', line 138

def enter_selection_mode
  @state = :selection
end

#feed(data) ⇒ Object 



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# File 'lib/muxr/input_handler.rb', line 87

def feed(data)
  remaining = data
  until remaining.empty?
    if @state == :idle
      # Fast path for pass-through: forward everything up to the next
      # Ctrl-a as a single chunk so a large paste doesn't turn into one
      # PTY write per byte. PREFIX is single-byte ASCII (\x01) and never
      # appears mid-UTF-8, so byte/char index match.
      idx = remaining.index(PREFIX)
      if idx.nil?
        @app.send_to_focused(remaining)
        return
      end
      @app.send_to_focused(remaining[0...idx]) if idx > 0
      @state = :prefix
      remaining = remaining[(idx + 1)..] || ""
      next
    end

    ch = remaining[0]
    remaining = remaining[1..] || ""
    case @state
    when :help
      @app.dismiss_help
      @state = :idle
    when :confirm_quit
      handle_confirm_quit(ch)
    when :prefix
      handle_prefix(ch)
    when :command
      handle_command_input(ch)
    when :scrollback
      handle_scrollback_input(ch)
    when :selection
      handle_selection_input(ch)
    end
  end
end