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
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.



50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
 
# File 'lib/muxr/application.rb', line 50

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 = +""
end

Instance Attribute Details

#input ⇒ Object (readonly)

Returns the value of attribute input.



23
24
25
 
# File 'lib/muxr/application.rb', line 23

def input
  @input
end

#paste_buffer ⇒ Object (readonly)

Returns the value of attribute paste_buffer.



66
67
68
 
# File 'lib/muxr/application.rb', line 66

def paste_buffer
  @paste_buffer
end

#renderer ⇒ Object (readonly)

Returns the value of attribute renderer.



23
24
25
 
# File 'lib/muxr/application.rb', line 23

def renderer
  @renderer
end

#session ⇒ Object (readonly)

Returns the value of attribute session.



23
24
25
 
# File 'lib/muxr/application.rb', line 23

def session
  @session
end

#session_name ⇒ Object (readonly)

Returns the value of attribute session_name.



23
24
25
 
# File 'lib/muxr/application.rb', line 23

def session_name
  @session_name
end

Class Method Details

.alive_socket?(path) ⇒ Boolean

Returns:

  • (Boolean) 


42
43
44
45
46
47
48
 
# File 'lib/muxr/application.rb', line 42

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.



32
33
34
35
36
37
38
39
40
 
# File 'lib/muxr/application.rb', line 32

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 



25
26
27
 
# File 'lib/muxr/application.rb', line 25

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

Instance Method Details

#cancel_quit ⇒ Object 



217
218
219
220
221
222
 
# File 'lib/muxr/application.rb', line 217

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

#close_focused ⇒ Object 



131
132
133
134
135
136
137
138
139
140
 
# File 'lib/muxr/application.rb', line 131

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 



213
214
215
 
# File 'lib/muxr/application.rb', line 213

def confirm_quit
  shutdown_server
end

#cycle_layout ⇒ Object 



142
143
144
145
146
 
# File 'lib/muxr/application.rb', line 142

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.



412
413
414
415
416
 
# File 'lib/muxr/application.rb', line 412

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

#detach ⇒ Object 



189
190
191
192
193
 
# File 'lib/muxr/application.rb', line 189

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

#dismiss_help ⇒ Object 



235
236
237
238
 
# File 'lib/muxr/application.rb', line 235

def dismiss_help
  @help_visible = false
  invalidate
end

#drain_client_writes ⇒ Object 



418
419
420
421
422
423
424
425
426
427
428
429
430
 
# File 'lib/muxr/application.rb', line 418

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 



240
241
242
243
244
245
246
 
# File 'lib/muxr/application.rb', line 240

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

#enter_selection ⇒ Object 



274
275
276
277
278
279
280
281
282
283
284
 
# File 'lib/muxr/application.rb', line 274

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 



248
249
250
251
252
253
254
 
# File 'lib/muxr/application.rb', line 248

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

#exit_selection(yank:) ⇒ Object 



303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
 
# File 'lib/muxr/application.rb', line 303

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 



371
372
373
374
375
 
# File 'lib/muxr/application.rb', line 371

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

#focus_last ⇒ Object 



112
113
114
115
116
117
118
119
120
 
# File 'lib/muxr/application.rb', line 112

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 



92
93
94
95
96
97
98
99
100
 
# File 'lib/muxr/application.rb', line 92

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 



122
123
124
125
126
127
128
129
 
# File 'lib/muxr/application.rb', line 122

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 



102
103
104
105
106
107
108
109
110
 
# File 'lib/muxr/application.rb', line 102

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 



170
171
172
173
174
175
176
 
# File 'lib/muxr/application.rb', line 170

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

#invalidate ⇒ Object 



377
378
379
 
# File 'lib/muxr/application.rb', line 377

def invalidate
  @needs_render = true
end

#list_sessions ⇒ Object 



395
396
397
398
399
400
401
402
403
 
# File 'lib/muxr/application.rb', line 395

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 



332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
 
# File 'lib/muxr/application.rb', line 332

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 



84
85
86
87
88
89
90
 
# File 'lib/muxr/application.rb', line 84

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 



365
366
367
368
369
 
# File 'lib/muxr/application.rb', line 365

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

#promote_master ⇒ Object 



148
149
150
151
 
# File 'lib/muxr/application.rb', line 148

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).



198
199
200
 
# File 'lib/muxr/application.rb', line 198

def quit
  request_quit
end

#quit_immediate ⇒ Object 



202
203
204
 
# File 'lib/muxr/application.rb', line 202

def quit_immediate
  request_quit
end

#request_quit ⇒ Object 



206
207
208
209
210
211
 
# File 'lib/muxr/application.rb', line 206

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

#reset_drawer ⇒ Object 



178
179
180
181
182
183
184
185
186
187
 
# File 'lib/muxr/application.rb', line 178

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 



386
387
388
389
390
391
392
393
 
# File 'lib/muxr/application.rb', line 386

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 



68
69
70
71
72
73
74
75
 
# File 'lib/muxr/application.rb', line 68

def run
  setup
  begin
    loop_forever
  ensure
    teardown
  end
end

#run_command(cmd_line) ⇒ Object 



224
225
226
227
 
# File 'lib/muxr/application.rb', line 224

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

#save_session ⇒ Object 



381
382
383
384
 
# File 'lib/muxr/application.rb', line 381

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

#scroll_focused(action) ⇒ Object 



256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
 
# File 'lib/muxr/application.rb', line 256

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) ———-



79
80
81
82
 
# File 'lib/muxr/application.rb', line 79

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

#show_drawer ⇒ Object 



162
163
164
165
166
167
168
 
# File 'lib/muxr/application.rb', line 162

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

#show_help ⇒ Object 



229
230
231
232
233
 
# File 'lib/muxr/application.rb', line 229

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

#toggle_drawer ⇒ Object 



153
154
155
156
157
158
159
160
 
# File 'lib/muxr/application.rb', line 153

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 



286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
 
# File 'lib/muxr/application.rb', line 286

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