Class: KV::Screen

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

Defined Under Namespace

Classes: RenderStatus

Constant Summary collapse

LINE_ATTR = 
Curses::A_DIM
ANIMATION = 
['[O     ]',
'[o.    ]',
'[...   ]',
'[ ...  ]',
'[  ... ]',
'[   ...]',
'[    .o]',
'[     O]',
'[    .o]',
'[   ...]',
'[  ... ]',
'[  ... ]',
'[ ...  ]',
'[...   ]',
'[o.    ]',
]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input, lines: [], name: nil, search: nil, first_line: 0, following_mode: false, line_mode: false, separation_mode: false, time_stamp: nil, ext_input: nil, fifo_file: nil, watch: false, filter_command: nil) ⇒ Screen

Returns a new instance of Screen.



32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
 
# File 'lib/kv.rb', line 32

def initialize input, lines: [],
               name: nil,
               search: nil,
               first_line: 0,
               following_mode: false,
               line_mode: false,
               separation_mode: false,
               time_stamp: nil,
               ext_input: nil,
               fifo_file: nil,
               watch: false,
               filter_command: nil

  @rs = RenderStatus.new
  @last_rs = nil
  @rs.y = first_line
  @rs.goto = first_line if first_line > 0
  @rs.x = 0
  @rs.last_lineno = 0
  @rs.line_mode = line_mode
  @rs.search = search
  @rs.wrapping = false
  @rs.ts_mode = false
  @rs.separation_mode = separation_mode

  @name = name
  @filename = @name if @name && File.exist?(@name)
  @filter_command = @filename && filter_command

  @time_stamp = time_stamp
  @ext_input = ext_input
  @fifo_file = fifo_file

  @lines = lines
  @mode = :screen

  @watch_mode = watch

  @following = following_mode
  @apos = 0

  @mouse = false
  @search_ignore_case = false
  @search_regexp = true
  @loading = false
  @buffer_lines = 10_000
  @yq = Queue.new
  if @filename
    @load_unlimited = true
  else
    @load_unlimited = false
  end

  @prev_render = {}
  input = open_file if @filename
  @meta = input.respond_to?(:meta) ? input.meta : nil
  read_async input if input
end

Instance Attribute Details

#x ⇒ Object

Returns the value of attribute x.



176
177
178
 
# File 'lib/kv.rb', line 176

def x
  @x
end

Instance Method Details

#cattr(attr) ⇒ Object 



217
218
219
220
221
222
223
224
 
# File 'lib/kv.rb', line 217

def cattr attr
  Curses.attron attr
  begin
    yield
  ensure
    Curses.attroff attr
  end
end

#check_update ⇒ Object 



390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
 
# File 'lib/kv.rb', line 390

def check_update
  if @loading == false
    if @filename && File.mtime(@filename) > @file_mtime
      screen_status "#{@filename} is updated."

      if @watch_mode
        @lines = []
        input = open_file
        read_async input
      else
        input = open(@filename)

        if input.size < @file_lastpos
          screen_status "#{@filename} is truncated. Rewinded."
          pause
          @lineno = 0
        else
          input.seek @file_lastpos
        end
        read_async input
      end
    end
  end
end

#control ⇒ Object 



756
757
758
759
760
761
762
763
764
765
 
# File 'lib/kv.rb', line 756

def control
  case @mode
  when :screen
    control_screen
  when :terminal
    control_terminal
  else
    raise
  end
end

#control_screen ⇒ Object 



536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
 
# File 'lib/kv.rb', line 536

def control_screen
  ev = render_screen

  case ev
  when 'q'
    raise PopScreen

  when Curses::KEY_UP, 'k'
    self.y -= 1
  when Curses::KEY_DOWN, 'j'
    self.y += 1
  when Curses::KEY_LEFT, 'h'
    self.x -= 1
  when Curses::KEY_RIGHT, 'l'
    self.x += 1
  when 'g'
    self.y = 0
    self.x = 0
  when 'G'
    self.y = self.y_max
    self.x = 0
  when ' ', Curses::KEY_NPAGE, Curses::KEY_CTRL_D
    self.y += Curses.lines-1
  when Curses::KEY_PPAGE, Curses::KEY_CTRL_U
    self.y -= Curses.lines-1

  when /[0-9]/
    screen_status "Goto:", ev
    ystr = input_str(/\d/, ev)
    if ystr && !ystr.empty?
      @rs.goto = ystr.to_i - 1
      self.y = @rs.goto
    end

  when 'F'
    @following = true
    set_load_unlimited true

  when 'L'
    set_load_unlimited !@load_unlimited

  when '/'
    search_str = ''.dup

    update_search_status = -> do
      regexp = @search_regexp ? 'regexp' : 'string'
      ignore = @search_ignore_case ? '/ignore' : ''
      screen_status "Search[#{regexp}#{ignore}]:", search_str
    end

    update_search_status[]
    input_str(/./, search_str, other_actions: {
      Curses::KEY_CTRL_I => -> ev do
        @search_ignore_case = !@search_ignore_case
        update_search_status[]
      end,
      Curses::KEY_CTRL_R => -> ev do
        @search_regexp = !@search_regexp
        update_search_status[]
      end,
    })

    if search_str && !search_str.empty?
      ic = @search_ignore_case ? [Regexp::IGNORECASE] : []
      if @search_regexp
        begin
          @rs.search = Regexp.compile(search_str, *ic)
        rescue RegexpError => e
          @rs.search = nil
          screen_status "regexp compile error: #{e.message}"
          pause
        end
      else
        @rs.search = Regexp.compile(Regexp.escape(search_str), *ic)
      end
    else
      @rs.search = nil
    end
    if @rs.search
      @rs.search.instance_variable_set(:@search_str, search_str)
      search_next self.y
    end
  when 'n'
    search_next self.y+1 if @rs.search
  when 'p'
    search_prev self.y-1 if @rs.search
  when 'f'
    if @rs.search
      filter_mode_title = "*filter mode [#{self.search_str}]*"
      if @name != filter_mode_title
        lines = @lines.grep(@rs.search)
        fscr = Screen.new nil, lines: lines, search: @rs.search, name: filter_mode_title
        raise PushScreen.new(fscr)
      end
    end

  when 's'
    screen_status "Save file:"
    file = input_str /./
    begin
      if file && !file.empty?
        if File.exist? file
          screen_status "#{file.dump} exists. Override? [y/n] "
          yn = input_str(/[yn]/)
          if yn == 'y'
            File.write(file, @lines.join("\n"))
          else
            # do nothing
            end
          else
            File.write(file, @lines.join("\n"))
          end
        end
      rescue SystemCallError
        # TODO: status line
      end

  when 'v'
    if @filename
      syste m("vi #{@filename} +#{self.y + 1}")
      @last_rs = nil
    end

  when 'P'
    begin
      if v = `gist -v` and /^gist v\d/ =~ v
        screen_status "gist-ing..."

        url = IO.popen('gist -p', 'a+'){|rw|
          @lines.each{|line| rw.puts line}
          rw.close_write
          rw.read
        }
        msg = "gist URL: #{url}"
        at_exit{
          puts msg
        }
        screen_status msg
        pause
      else
        raise v.inspect
      end
    rescue Errno::ENOENT
      screen_status 'gist command is not found'
      pause
    end

  when 'm'
    @mouse = !@mouse
    Curses.close_screen
    init_screen
  when Curses::KEY_MOUSE
    m = Curses.getmouse
    log m, "mouse ->"
    # log [m.bstate, m.x, m.y, m.z, m.eid]
    log @lines[self.y + m.y]

  when 'N'
    @rs.line_mode = !@rs.line_mode
  when 'T'
    @rs.ts_mode = !@rs.ts_mode if @time_stamp
  when 'S'
    @rs.separation_mode = !@rs.separation_mode
    @max_cols = []
  when 't'
    Curses.close_screen
    @mode = :terminal
  when 'x'
    while @ext_input && !@ext_input.closed?
      update_ext_status = -> str do
        screen_status "input for ext:", str
      end
      update_ext_status['']
      actions = {
        update: -> str do
          self.y = self.y_max
          render_data
          update_ext_status[str]
        end
      }
      str = input_str(/./, other_actions: actions)
      if str && !str.empty?
        @ext_input.puts str unless @ext_input.closed?
      else
        break
      end
    end

  when 'H'
    if @meta
      lines = @meta.map{|k, v| "#{k}: #{v}"}
      raise PushScreen.new(Screen.new nil, lines: lines, name: "Response header [#{@name}]")
    end

  when Curses::KEY_CTRL_G
    # do nothing

  when '?'
    raise PushScreen.new(Screen.new help_io)

  when nil
    # ignore

  when Curses::KEY_RESIZE
    # ignore

  else
    screen_status "unknown: #{key_name(ev)}"
    pause
  end
end

#control_terminal ⇒ Object 



748
749
750
751
752
753
754
 
# File 'lib/kv.rb', line 748

def control_terminal
  @rs.instance_eval('binding').irb

  @mode = :screen
  init_screen
  @last_rs = nil
end

#ctimeout(ms) ⇒ Object 



226
227
228
229
230
231
232
233
 
# File 'lib/kv.rb', line 226

def ctimeout ms
  Curses.timeout = ms
  begin
    yield
  ensure
    Curses.timeout = -1
  end
end

#init_screen ⇒ Object 



192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
 
# File 'lib/kv.rb', line 192

def init_screen
  Curses.init_screen
  Curses.stdscr.keypad(true)

  if @mouse
    Curses.mousemask(Curses::BUTTON1_CLICKED | Curses::BUTTON2_CLICKED |
                     Curses::BUTTON3_CLICKED | Curses::BUTTON4_CLICKED)
  else
    Curses.mousemask(0)
  end

  if @loading && self.y_max < @rs.y
    log [:going, self.y_max, @rs.y]
    @following = :going
  end
  self.y = @rs.y
end

#input_str(pattern, str = ''.dup, other_actions: {}) ⇒ Object 



503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
 
# File 'lib/kv.rb', line 503

def input_str pattern, str = ''.dup, other_actions: {}
  update_action = other_actions[:update]

  ctimeout update_action ? 200 : -1 do
    loop do
      ev = Curses.getch

      case ev
      when 10
        return str
      when Curses::KEY_BACKSPACE
        str.chop!
      when pattern
        str << ev
      when nil # timeout
        update_action[str]
      else
        if action = other_actions[ev]
          action.call(ev)
        else
          log "failure: #{key_name ev}"
          return nil
        end
      end
    end
  end
end

#key_name(ev) ⇒ Object 



496
497
498
499
500
501
 
# File 'lib/kv.rb', line 496

def key_name ev
  Curses.constants.grep(/KEY/){|c|
    return c if Curses.const_get(c) == ev
  }
  ev
end

#open_file ⇒ Object 



91
92
93
94
95
96
97
98
99
100
101
 
# File 'lib/kv.rb', line 91

def open_file
  input = open(@filename)
  @rs.last_lineno = 0

  if @filter_command
    io = IO.popen("#{@filter_command} #{@filename}", err: '/dev/null')
    # io.close_write
    input = io
  end
  input
end

#pause ⇒ Object 



531
532
533
534
 
# File 'lib/kv.rb', line 531

def pause
  ev = Curses.getch
  Curses.ungetch ev if ev
end

#read_async(input) ⇒ Object 



110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
 
# File 'lib/kv.rb', line 110

def read_async input
  @loading = true
  begin
    data = input.read_nonblock(800_000)
  rescue IO::EAGAINWaitReadable, EOFError
    data = ''
  end

  last_line = nil
  data.each_line{|line|
    if line[-1] != "\n"
      last_line = line
      break
    end
    @lines << setup_line(line)
  }

  Thread.abort_on_exception = true
  @reader_thread = Thread.new do
    while line = input.gets
      if last_line
        line = last_line + line
        last_line = nil
      end

      @lines << setup_line(line)

      while !@load_unlimited && @lines.size > self.y + @buffer_lines
        @yq.pop; @yq.clear
      end
      @yq.clear
    end
  ensure
    if @filename
      @file_mtime = File.mtime(@filename)
      @file_lastpos = input.tell unless @filter_command
    elsif @fifo_file
      input = open(@fifo_file)
      log(input)
      redo
    end
    input.close
    @loading = false
  end
end

#redraw! ⇒ Object 



767
768
769
 
# File 'lib/kv.rb', line 767

def redraw!
  @last_rs = nil
end

#render_data ⇒ Object 



237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
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
 
# File 'lib/kv.rb', line 237

def render_data
  # check update
  c_lines = @rs.c_lines = Curses.lines
  c_cols = @rs.c_cols  = Curses.cols

  if @rs != @last_rs
    @last_rs = @rs.dup
  else
    return
  end

  Curses.clear

  if @rs.separation_mode && (lines = @lines[self.y ... (self.y + c_lines - 1)])
    @max_cols = [] unless defined? @max_cols
    lines.each.with_index{|line, ln|
      line.split("\t").each_with_index{|w, i|
        @max_cols[i] = @max_cols[i] ? [@max_cols[i], w.size].max : w.size
      }
    }
  end

  (c_lines-1).times{|i|
    lno = i + self.y
    line = @lines[lno]
    cols = c_cols

    unless line
      if lno == @lines.size
        Curses.setpos i, 0
        cattr LINE_ATTR do
          Curses.addstr '(END)'
        end
      end

      break
    end

    Curses.setpos i, 0

    if @rs.line_mode
      cattr LINE_ATTR do
        lineno = line.instance_variable_get(:@lineno)
        ln_str = '%5d |' % lineno
        if @rs.goto == lineno - 1 || (@rs.search && (@rs.search === line))
          standout do
            Curses.addstr(ln_str)
          end
        else
          Curses.addstr(ln_str)
        end
        cols -= ln_str.size
      end
    end

    if @rs.ts_mode && ts = line.instance_variable_get(:@time_stamp)
      cattr LINE_ATTR do
        ts = line.instance_variable_get(:@time_stamp)
        Curses.addstr("#{ts} |")
      end
    end

    line = line[self.x, cols] || ''

    if @rs.separation_mode
      line = line.split(/\t/).tap{|e|
        if (max = @max_cols.size) > 0
          # fill empty columns
          e[max - 1] ||= nil
        end
      }.map.with_index{|w, i|
        "%-#{@max_cols[i]}s" % w
      }.join(' | ')
    end

    if !@rs.search || !(Regexp === @rs.search) ||
       (parts = search_partition(line, @rs.search)).is_a?(String)
      Curses.addstr line
    else
      cattr Curses::A_UNDERLINE do
        parts.each{|(matched, str)|
          if matched == :match
            standout{
              Curses.addstr str
            }
          else
            Curses.addstr str
          end
        }
      end
    end
  }
end

#render_screen ⇒ Object 



415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
 
# File 'lib/kv.rb', line 415

def render_screen
  ev = nil

  ms = @following ? 100 : 500

  ctimeout ms do
    while ev == nil
      render_data
      render_status
      ev = Curses.getch
      check_update
      y_max = self.y_max

      if @following
        case @following
        when :searching
          break if search_next_move
        when :going
          if @rs.goto <= y_max
            self.y = @rs.goto
            break
          end
        when true
          # ok
        else
          raise "unknown following mode: #{@following}"
        end

        self.y = y_max
      end
    end

    @following = false
    set_load_unlimited false

    return ev
  end
end

#render_status ⇒ Object 



343
344
345
346
347
348
349
350
 
# File 'lib/kv.rb', line 343

def render_status
  name = @name ? "<#{@name}>" : ''
  mouse  = @mouse ? ' [MOUSE]' : ''
  search = @rs.search ? " search[#{search_str}]" : ''
  loading = @loading ? " (loading...#{@load_unlimited ? '!' : nil}#{@following ? ' following' : ''}) " : ''
  x = self.x > 0 ? " x:#{self.x}" : ''
  screen_status "#{name} lines:#{self.y+1}/#{@lines.size}#{x}#{loading}#{search}#{mouse}"
end

#screen_status(status, post = nil) ⇒ Object 



369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
 
# File 'lib/kv.rb', line 369

def screen_status status, post = nil
  cols = Curses.cols
  line = Curses.lines-1
  Curses.setpos line, 0
  Curses.addstr ' '.ljust(cols)
  len  = status.size
  len += post.size if post

  standout{
    Curses.setpos Curses.lines-1, 0
    Curses.addstr status
  }
  Curses.addstr post if post

  if !post && len < cols - ANIMATION.first.size
    Curses.setpos line, cols - ANIMATION.first.size - 1
    @apos = (@apos + 1) % ANIMATION.size
    Curses.addstr ANIMATION[@apos]
  end
end

#search_next(start) ⇒ Object 



469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
 
# File 'lib/kv.rb', line 469

def search_next start
  @searching = start
  if search_next_move
    # OK. self.y is updated.
  else
    if @loading
      set_load_unlimited true
      @following = :searching
    else
      screen_status "not found: [#{self.search_str}]"
      pause
      @searching = false
    end
  end
end

#search_next_move ⇒ Object 



454
455
456
457
458
459
460
461
462
463
464
465
466
467
 
# File 'lib/kv.rb', line 454

def search_next_move
  last_line = @lines.size
  # log (@searching..last_line)

  (@searching...last_line).each{|i|
    if @rs.search === @lines[i]
      self.y = i
      @searching = false
      return true
    end
  }
  @searching = last_line
  return false
end

#search_prev(start) ⇒ Object 



485
486
487
488
489
490
491
492
493
494
 
# File 'lib/kv.rb', line 485

def search_prev start
  start.downto(0){|i|
    if @rs.search === @lines[i]
      self.y = i
      return true
    end
  }
  screen_status "not found: [#{self.search_str}]"
  pause
end

#search_str ⇒ Object 



331
332
333
334
335
336
337
338
339
340
341
 
# File 'lib/kv.rb', line 331

def search_str
  if @rs.search
    if str = @rs.search.instance_variable_get(:@search_str)
      str
    else
      @rs.search.inspect
    end
  else
    nil
  end
end

#set_load_unlimited(b) ⇒ Object 



187
188
189
190
 
# File 'lib/kv.rb', line 187

def set_load_unlimited b
  @load_unlimited = b
  @yq << true
end

#setup_line(line) ⇒ Object 



103
104
105
106
107
108
 
# File 'lib/kv.rb', line 103

def setup_line line
  line = line.chomp
  line.instance_variable_set(:@time_stamp, Time.now.strftime('%H:%M:%S')) if @time_stamp
  line.instance_variable_set(:@lineno, @rs.last_lineno += 1)
  line
end

#standout ⇒ Object 



211
212
213
214
215
 
# File 'lib/kv.rb', line 211

def standout
  cattr Curses::A_STANDOUT do
    yield
  end
end

#y ⇒ Object 



161
162
163
 
# File 'lib/kv.rb', line 161

def y
  @rs.y
end

#y=(y) ⇒ Object 



165
166
167
168
169
170
171
172
173
174
 
# File 'lib/kv.rb', line 165

def y=(y)
  if y > (ym = self.y_max)
    @rs.y = ym
  else
    @rs.y = y
  end

  @rs.y = 0 if @rs.y < 0
  @yq << nil if @loading
end

#y_max ⇒ Object 



156
157
158
159
 
# File 'lib/kv.rb', line 156

def y_max
  max = @lines.size - Curses.lines + 2
  max < 0 ? 0 : max
end