Class: Muxr::Application

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

Overview

The Application is the muxr server. It owns the Session, panes, Renderer, and InputHandler, and listens on a Unix socket at ~/.muxr/sockets/<name>.sock for a Client to attach. Shells and other PTY processes survive client detach/reattach — only the listening socket and the one currently-attached client come and go.

The Renderer’s output sink is a small adapter that frames its bytes into OUTPUT messages on the attached client; when no client is attached the bytes are silently dropped (we also skip the render entirely in that case). PTY data still gets drained even with no client, so the in-memory Terminal grids stay up to date and are repainted in full on the next attach via Renderer#reset_frame!.

Defined Under Namespace

Classes: FramedOutput

Constant Summary collapse

SELECT_TIMEOUT = 
0.05
MIN_FRAME_INTERVAL =

~60 Hz cap on full repaints. Keystrokes in fzf or vim navigation can trigger PTY bursts faster than the terminal can usefully display them; the cap collapses those bursts and stops intermediate frames from showing through.

1.0 / 60
SOCKETS_DIR = 
File.join(Dir.home, ".muxr", "sockets").freeze
DEFAULT_WIDTH = 
80
DEFAULT_HEIGHT = 
24

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(argv = []) ⇒ Application

Returns a new instance of Application.



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# File 'lib/muxr/application.rb', line 55

def initialize(argv = [])
  @argv = argv
  @session_name = parse_session_name(argv)
  @running = false
  @needs_render = true
  @message = nil
  @message_expires = nil
  @help_visible = false
  @next_pane_id = 0
  @current_client = nil
  @client_write_buffer = +"".b
  @listening_socket = nil
  @socket_path = self.class.socket_path_for(@session_name)
  @paste_buffer = +""
  @last_render_at = nil
end

Instance Attribute Details

#input ⇒ Object (readonly)

Returns the value of attribute input.



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# File 'lib/muxr/application.rb', line 28

def input
  @input
end

#paste_buffer ⇒ Object (readonly)

Returns the value of attribute paste_buffer.



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# File 'lib/muxr/application.rb', line 72

def paste_buffer
  @paste_buffer
end

#renderer ⇒ Object (readonly)

Returns the value of attribute renderer.



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# File 'lib/muxr/application.rb', line 28

def renderer
  @renderer
end

#session ⇒ Object (readonly)

Returns the value of attribute session.



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# File 'lib/muxr/application.rb', line 28

def session
  @session
end

#session_name ⇒ Object (readonly)

Returns the value of attribute session_name.



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# File 'lib/muxr/application.rb', line 28

def session_name
  @session_name
end

Class Method Details

.alive_socket?(path) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/muxr/application.rb', line 47

def self.alive_socket?(path)
  return false unless File.exist?(path)
  UNIXSocket.new(path).close
  true
rescue SystemCallError
  false
end

.list_active ⇒ Object

Names of sessions whose server socket is currently accepting connections. Stale sockets (file exists, no listener) are skipped but left in place; cleanup happens on the next attach attempt.



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# File 'lib/muxr/application.rb', line 37

def self.list_active
  return [] unless File.directory?(SOCKETS_DIR)
  Dir.children(SOCKETS_DIR).filter_map do |entry|
    next unless entry.end_with?(".sock")
    path = File.join(SOCKETS_DIR, entry)
    next unless alive_socket?(path)
    File.basename(entry, ".sock")
  end.sort
end

.socket_path_for(name) ⇒ Object 



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# File 'lib/muxr/application.rb', line 30

def self.socket_path_for(name)
  File.join(SOCKETS_DIR, "#{name}.sock")
end

Instance Method Details

#cancel_quit ⇒ Object 



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# File 'lib/muxr/application.rb', line 223

def cancel_quit
  @message = nil
  @message_expires = nil
  flash("cancelled")
  invalidate
end

#close_focused ⇒ Object 



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# File 'lib/muxr/application.rb', line 137

def close_focused
  if @session.focus_drawer && @session.drawer&.visible?
    hide_drawer
    return
  end
  pane = focused_pane
  return unless pane
  @session.window.remove_pane(pane)
  invalidate
end

#confirm_quit ⇒ Object 



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# File 'lib/muxr/application.rb', line 219

def confirm_quit
  shutdown_server
end

#cycle_layout ⇒ Object 



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# File 'lib/muxr/application.rb', line 148

def cycle_layout
  @session.window.cycle_layout
  flash("layout: #{@session.window.layout}")
  invalidate
end

#deliver_output(bytes) ⇒ Object

Called by the FramedOutput adapter; queues one OUTPUT frame to the currently attached client and tries to push as much as the socket will take without blocking. Anything left over stays in socket reports writable. This prevents a slow client (or slow terminal upstream of the client) from deadlocking the server when the server is also trying to read from that same client.



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# File 'lib/muxr/application.rb', line 418

def deliver_output(bytes)
  return unless @current_client
  @client_write_buffer << Protocol.frame(Protocol::OUTPUT, bytes)
  drain_client_writes
end

#detach ⇒ Object 



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# File 'lib/muxr/application.rb', line 195

def detach
  flash("detached")
  disconnect_client(reason: "detached")
  # Server keeps running. Next `bin/muxr <name>` invocation will re-attach.
end

#dismiss_help ⇒ Object 



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# File 'lib/muxr/application.rb', line 241

def dismiss_help
  @help_visible = false
  invalidate
end

#drain_client_writes ⇒ Object 



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# File 'lib/muxr/application.rb', line 424

def drain_client_writes
  return unless @current_client
  return if @client_write_buffer.empty?
  loop do
    n = @current_client.write_nonblock(@client_write_buffer)
    @client_write_buffer = @client_write_buffer.byteslice(n..-1) || +"".b
    break if @client_write_buffer.empty?
  end
rescue IO::WaitWritable
  # Socket send buffer is full; the rest stays queued.
rescue Errno::EPIPE, Errno::ECONNRESET, IOError
  drop_client_silently
end

#enter_scrollback ⇒ Object 



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# File 'lib/muxr/application.rb', line 246

def enter_scrollback
  target = focused_target
  return unless target
  @input.enter_scrollback_mode
  @renderer.reset_frame!
  invalidate
end

#enter_selection ⇒ Object 



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# File 'lib/muxr/application.rb', line 280

def enter_selection
  target = focused_target
  return unless target
  # Vim-style: drop the user at a movable cursor with NO selection yet.
  # They navigate with h/j/k/l, then press v (linear) or C-v (block) to
  # anchor.
  target.terminal.place_selection_cursor(0, 0)
  @input.enter_selection_mode
  @renderer.reset_frame!
  invalidate
end

#exit_scrollback ⇒ Object 



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# File 'lib/muxr/application.rb', line 254

def exit_scrollback
  target = focused_target
  target&.terminal&.clear_selection
  target&.terminal&.scroll_to_bottom
  @renderer.reset_frame!
  invalidate
end

#exit_selection(yank:) ⇒ Object 



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# File 'lib/muxr/application.rb', line 309

def exit_selection(yank:)
  target = focused_target
  term = target&.terminal
  yanked = false
  if yank
    # No anchor → no-op. User is still positioning; they can press v
    # first, then yank. Esc/q is the way to exit from navigation.
    return unless term&.selection_active?
    text = term.extract_selection_text
    unless text.empty?
      @paste_buffer = text
      spawn_pbcopy(text)
      flash("yanked #{text.bytesize} bytes")
      yanked = true
    end
  end
  term&.clear_selection
  if yanked
    # vim-style: yanking drops you straight back to "normal" (idle),
    # not back into scrollback navigation.
    term&.scroll_to_bottom
    @input.enter_idle_mode
  else
    @input.enter_scrollback_mode
  end
  @renderer.reset_frame!
  invalidate
end

#flash(msg) ⇒ Object 



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# File 'lib/muxr/application.rb', line 377

def flash(msg)
  @message = msg
  @message_expires = Time.now + 2.5
  invalidate
end

#focus_last ⇒ Object 



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# File 'lib/muxr/application.rb', line 118

def focus_last
  return if @session.window.panes.empty?
  if @session.focus_drawer && @session.drawer&.visible?
    @session.focus_drawer = false
  else
    @session.window.focus_last
  end
  invalidate
end

#focus_next ⇒ Object 



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# File 'lib/muxr/application.rb', line 98

def focus_next
  return if @session.window.panes.empty?
  if @session.focus_drawer && @session.drawer&.visible?
    @session.focus_drawer = false
  else
    @session.window.focus_next
  end
  invalidate
end

#focus_pane_number(n) ⇒ Object 



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# File 'lib/muxr/application.rb', line 128

def focus_pane_number(n)
  return if @session.window.panes.empty?
  idx = n - 1
  return unless idx >= 0 && idx < @session.window.panes.length
  @session.focus_drawer = false
  @session.window.focus_index(idx)
  invalidate
end

#focus_prev ⇒ Object 



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# File 'lib/muxr/application.rb', line 108

def focus_prev
  return if @session.window.panes.empty?
  if @session.focus_drawer && @session.drawer&.visible?
    @session.focus_drawer = false
  else
    @session.window.focus_prev
  end
  invalidate
end

#hide_drawer ⇒ Object 



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# File 'lib/muxr/application.rb', line 176

def hide_drawer
  return unless @session.drawer&.visible?
  @session.drawer.hide!
  @session.focus_drawer = false
  renderer.reset_frame!
  invalidate
end

#invalidate ⇒ Object 



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# File 'lib/muxr/application.rb', line 383

def invalidate
  @needs_render = true
end

#list_sessions ⇒ Object 



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# File 'lib/muxr/application.rb', line 401

def list_sessions
  names = Session.list
  if names.empty?
    flash("no saved sessions")
  else
    marker = ->(n) { n == @session_name ? "*#{n}" : n }
    flash("sessions: #{names.map(&marker).join(", ")}")
  end
end

#move_selection(action) ⇒ Object 



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# File 'lib/muxr/application.rb', line 338

def move_selection(action)
  target = focused_target
  return unless target
  term = target.terminal
  rows = term.rows
  cols = term.cols
  case action
  when :left       then term.move_selection_cursor_by(0, -1)
  when :right      then term.move_selection_cursor_by(0, 1)
  when :up         then term.move_selection_cursor_by(-1, 0)
  when :down       then term.move_selection_cursor_by(1, 0)
  when :half_up    then term.move_selection_cursor_by(-[rows / 2, 1].max, 0)
  when :half_down  then term.move_selection_cursor_by([rows / 2, 1].max, 0)
  when :full_up    then term.move_selection_cursor_by(-[rows - 1, 1].max, 0)
  when :full_down  then term.move_selection_cursor_by([rows - 1, 1].max, 0)
  when :line_start then term.selection_cursor_to_line_start
  when :line_end   then term.selection_cursor_to_line_end
  when :line_first_nonblank then term.selection_cursor_to_first_non_blank
  when :top              then term.selection_cursor_to_top
  when :bottom           then term.selection_cursor_to_bottom
  when :screen_top       then term.selection_cursor_to_viewport(:top)
  when :screen_middle    then term.selection_cursor_to_viewport(:middle)
  when :screen_bottom    then term.selection_cursor_to_viewport(:bottom)
  when :word_forward      then term.selection_cursor_word_forward(big: false)
  when :word_forward_big  then term.selection_cursor_word_forward(big: true)
  when :word_end          then term.selection_cursor_word_end(big: false)
  when :word_end_big      then term.selection_cursor_word_end(big: true)
  when :word_backward     then term.selection_cursor_word_backward(big: false)
  when :word_backward_big then term.selection_cursor_word_backward(big: true)
  end
  invalidate
end

#new_pane ⇒ Object 



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# File 'lib/muxr/application.rb', line 90

def new_pane
  cwd = focused_pane&.cwd
  @session.window.add_pane(make_pane(cwd: cwd))
  @session.focus_drawer = false
  @session.window.focused_index = @session.window.panes.length - 1
  invalidate
end

#paste_from_buffer ⇒ Object 



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# File 'lib/muxr/application.rb', line 371

def paste_from_buffer
  return if @paste_buffer.nil? || @paste_buffer.empty?
  target = focused_target
  target&.write(@paste_buffer)
end

#promote_master ⇒ Object 



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# File 'lib/muxr/application.rb', line 154

def promote_master
  @session.window.promote_to_master
  invalidate
end

#quit ⇒ Object

Both Ctrl-a q and :quit funnel through here. We don’t kill the server immediately — InputHandler enters a confirmation state and the user has to press ‘y’ to actually shut down (see :request_quit_confirmed).



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# File 'lib/muxr/application.rb', line 204

def quit
  request_quit
end

#quit_immediate ⇒ Object 



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# File 'lib/muxr/application.rb', line 208

def quit_immediate
  request_quit
end

#request_quit ⇒ Object 



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# File 'lib/muxr/application.rb', line 212

def request_quit
  return if @input.state == :confirm_quit
  @input.enter_confirm_quit
  flash("kill session? (y/n)")
  invalidate
end

#reset_drawer ⇒ Object 



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# File 'lib/muxr/application.rb', line 184

def reset_drawer
  if @session.drawer
    @session.drawer.close
    @session.drawer = nil
  end
  @session.focus_drawer = false
  renderer.reset_frame!
  flash("drawer reset")
  invalidate
end

#restore_session ⇒ Object 



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# File 'lib/muxr/application.rb', line 392

def restore_session
  data = Session.load(@session_name)
  if data
    flash("session file: #{Session.save_path_for(@session_name)}")
  else
    flash("no saved session")
  end
end

#run ⇒ Object 



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# File 'lib/muxr/application.rb', line 74

def run
  setup
  begin
    loop_forever
  ensure
    teardown
  end
end

#run_command(cmd_line) ⇒ Object 



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# File 'lib/muxr/application.rb', line 230

def run_command(cmd_line)
  CommandDispatcher.new(self).dispatch(cmd_line)
  invalidate
end

#save_session ⇒ Object 



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# File 'lib/muxr/application.rb', line 387

def save_session
  path = @session.save
  flash("saved: #{path}")
end

#scroll_focused(action) ⇒ Object 



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# File 'lib/muxr/application.rb', line 262

def scroll_focused(action)
  target = focused_target
  return unless target
  term = target.terminal
  rows = term.rows
  case action
  when :line_back     then term.scroll_back(1)
  when :line_forward  then term.scroll_forward(1)
  when :half_back     then term.scroll_back([rows / 2, 1].max)
  when :half_forward  then term.scroll_forward([rows / 2, 1].max)
  when :full_back     then term.scroll_back([rows - 1, 1].max)
  when :full_forward  then term.scroll_forward([rows - 1, 1].max)
  when :top           then term.scroll_to_top
  when :bottom        then term.scroll_to_bottom
  end
  invalidate
end

#send_to_focused(data) ⇒ Object

———- public action API (called from InputHandler / CommandDispatcher) ———-



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# File 'lib/muxr/application.rb', line 85

def send_to_focused(data)
  target = focused_target
  target&.write(data)
end

#show_drawer ⇒ Object 



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# File 'lib/muxr/application.rb', line 168

def show_drawer
  ensure_drawer
  @session.drawer.show!
  @session.focus_drawer = true
  renderer.reset_frame!
  invalidate
end

#show_help ⇒ Object 



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# File 'lib/muxr/application.rb', line 235

def show_help
  @help_visible = true
  @input.enter_help_mode
  invalidate
end

#toggle_drawer ⇒ Object 



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# File 'lib/muxr/application.rb', line 159

def toggle_drawer
  ensure_drawer
  @session.drawer.toggle!
  @session.focus_drawer = @session.drawer.visible?
  @session.focus_drawer = false unless @session.drawer.visible?
  renderer.reset_frame!
  invalidate
end

#toggle_selection(mode) ⇒ Object 



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# File 'lib/muxr/application.rb', line 292

def toggle_selection(mode)
  target = focused_target
  return unless target
  term = target.terminal
  if term.selection_active? && term.selection_mode == mode
    # Same mode pressed again — drop the anchor, return to navigation.
    term.clear_anchor!
  else
    # No anchor, or switching between linear/block — anchor at the
    # current cursor in the requested mode (vim keeps the visual range
    # when switching shapes, and we mirror that by not moving the
    # cursor).
    term.anchor_selection!(mode: mode)
  end
  invalidate
end