Class: Fatty::Renderer::Curses

Inherits:
Fatty::Renderer show all
Includes:
Curses::WindowStyling
Defined in:
lib/fatty/renderer/curses.rb

Constant Summary

Constants included from Curses::WindowStyling

Curses::WindowStyling::ATTR_FLAGS

Constants inherited from Fatty::Renderer

CORNER_STYLES, FRAME_STYLES, POPUP_SELECTED_GUTTER, POPUP_UNSELECTED_GUTTER

Instance Attribute Summary

Attributes inherited from Fatty::Renderer

#context, #palette, #screen, #theme_version

Instance Method Summary collapse

Methods included from Curses::WindowStyling

#attr_flag, #pair_attr

Methods inherited from Fatty::Renderer

#apply_theme!, #invalidate!

Constructor Details

#initialize ⇒ Curses

Returns a new instance of Curses.



10
11
12
 
# File 'lib/fatty/renderer/curses.rb', line 10

def initialize(...)
  super
end

Instance Method Details

#begin_frame ⇒ Object 



349
350
 
# File 'lib/fatty/renderer/curses.rb', line 349

def begin_frame
end

#clear_input_field ⇒ Object 



88
89
90
91
92
93
94
95
96
97
98
99
 
# File 'lib/fatty/renderer/curses.rb', line 88

def clear_input_field
  @last_input_state = nil

  win = context.input_win
  return unless win

  attr = pair_attr(:input, fallback: ::Curses::A_NORMAL)
  win.bkgdset(attr) if win.respond_to?(:bkgdset)
  win.erase
  win.attrset(attr)
  stage_window(win)
end

#finish_frame ⇒ Object 



352
353
354
 
# File 'lib/fatty/renderer/curses.rb', line 352

def finish_frame
  ::Curses.doupdate
end

#hide_cursor ⇒ Object 



382
383
384
385
 
# File 'lib/fatty/renderer/curses.rb', line 382

def hide_cursor
  ::Curses.curs_set(0)
  self
end

#render_alert(alert_session) ⇒ Object 



101
102
103
104
105
106
107
108
109
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
 
# File 'lib/fatty/renderer/curses.rb', line 101

def render_alert(alert_session)
  state = alert_state(alert_session)
  return if state == @last_alert_state

  @last_alert_state = state

  win = context.alert_win
  return unless win

  alert = alert_session.current
  text = alert ? alert.format : ""
  role = alert ? alert_role(alert.role) : :alert_info
  base_attr = pair_attr(role, fallback: pair_attr(:alert, fallback: ::Curses::A_REVERSE))
  cols = win.respond_to?(:maxx) ? win.maxx : screen.alert_rect.cols

  win.bkgdset(base_attr) if win.respond_to?(:bkgdset)
  win.erase
  win.attrset(base_attr)
  win.setpos(0, 0)

  segments = Fatty::Ansi.segment(text).map do |segment_text, style|
    {
      text: segment_text,
      role: role,
      style: style,
    }
  end

  draw_status_row(
    win,
    row: 0,
    cols: cols,
    segments: segments,
    base_attr: base_attr,
  )

  stage_window(win)
end

#render_input_field(field, role: :input) ⇒ Object 



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
 
# File 'lib/fatty/renderer/curses.rb', line 55

def render_input_field(field, role: :input)
  state = input_field_state(field)
  return if state == @last_input_state

  @last_input_state = state

  win = context.input_win
  return unless win

  width = win.respond_to?(:maxx) ? win.maxx : screen.cols
  base_attr = pair_attr(role, fallback: ::Curses::A_NORMAL)
  region_attr = pair_attr(:region, fallback: ::Curses::A_REVERSE)
  suggestion_attr = pair_attr(:input_suggestion, fallback: base_attr)

  win.bkgdset(base_attr) if win.respond_to?(:bkgdset)
  win.erase
  win.attrset(base_attr)

  render_field_into(
    win: win,
    field: field,
    row: 0,
    width: width,
    base_role: role,
    base_attr: base_attr,
    region_attr: region_attr,
    suggestion_attr: suggestion_attr,
  )
  cursor_x = field.cursor_x.to_i.clamp(0, [width - 1, 0].max)
  win.setpos(0, cursor_x)
  stage_window(win)
end

#render_output(output_session, viewport: output_session.viewport) ⇒ Object 



22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
 
# File 'lib/fatty/renderer/curses.rb', line 22

def render_output(output_session, viewport: output_session.viewport)
  lines = viewport.slice(output_session.visible_lines)
  normalized = normalized_highlights(output_session.highlights)
  line_number_width =
    if output_session.line_numbers?
      output_session.output.lines.length.to_s.length
    end

  curr = output_state(output_session, viewport: viewport)
  prev = @last_output_state

  if prev &&
     !output_session.line_numbers? &&
     !ansi_lines?(lines) &&
     output_session.incrementally_scrollable_from?(prev, curr)
    scroll_output_window_delta!(
      delta: output_session.scroll_delta_from(prev, curr),
      lines: lines,
      viewport: viewport,
      highlights: normalized,
    )
  else
    draw_output_lines(
      lines,
      viewport: viewport,
      highlights: normalized,
      line_number_width: line_number_width,
    )
  end
  @last_pager_field_state = nil
  @last_output_state = curr
end

#render_pager_field(field, row:, role: :pager_status) ⇒ Object

Render an InputField-like status line.

Used for pager mode ("--More--" etc.). It intentionally does not move the cursor; ShellSession decides whether to show a cursor in paging vs input mode.

Curses uses a derived one-line window to isolate the pager/search field from output_win scrolling/background effects.

Truecolor renders the same field as an ANSI overlay at absolute coordinates, so no derived window is needed there.



151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
 
# File 'lib/fatty/renderer/curses.rb', line 151

def render_pager_field(field, row:, role: :pager_status)
  win = context.output_win
  return unless win

  cols = win.respond_to?(:maxx) ? win.maxx : @screen.cols
  attr = pair_attr(role, fallback: ::Curses::A_REVERSE)

  field_win = win.derwin(1, cols, row, 0)
  field_win.bkgdset(attr) if field_win.respond_to?(:bkgdset)
  field_win.erase
  field_win.attrset(attr)

  render_field_into(
    win: field_win,
    field: field,
    row: 0,
    width: cols,
    base_attr: attr,
    region_attr: pair_attr(:region, fallback: ::Curses::A_REVERSE),
    suggestion_attr: pair_attr(:input_suggestion, fallback: attr),
    base_role: role,
  )

  field_win.noutrefresh
  stage_window(win)
ensure
  field_win&.close if field_win&.respond_to?(:close)
end

#render_popup(session:) ⇒ Object

Modal overlays, render_popup and render_prompt_popu are deliberately not state-cached.

They must be restaged on every frame because they are drawn on top of the focused session. Even when the overlay's own state has not changed, the underlying session may have redrawn the area beneath it. Skipping the overlay render would let the underlying frame erase or visually punch through it.



187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
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
 
# File 'lib/fatty/renderer/curses.rb', line 187

def render_popup(session:)
  win = session.win
  return unless win

  width = win.maxx
  height = win.maxy
  return if width < 2 || height < 2

  win.erase

  frame_attr = pair_attr(:popup_frame, fallback: ::Curses::A_NORMAL)
  popup_attr = pair_attr(:popup, fallback: ::Curses::A_NORMAL)
  input_attr = pair_attr(:popup_input, fallback: ::Curses::A_REVERSE)
  selected_attr = pair_attr(:popup_selection, fallback: ::Curses::A_REVERSE)
  counts_attr = pair_attr(:popup_counts, fallback: popup_attr)

  win.attrset(frame_attr)
  draw_popup_frame(win, width: width, height: height)
  render_popup_title(win, session: session, width: width)

  inner_h = height - 2
  inner_w = width - 2
  return if inner_h <= 0 || inner_w <= 0

  inner = win.derwin(inner_h, inner_w, 1, 1)
  inner.bkgdset(popup_attr) if inner.respond_to?(:bkgdset)
  inner.erase

  row = render_popup_message(inner, session: session, row: 0, width: inner_w, attr: popup_attr)

  counts_present = session.counts_present?
  filter_present = session.filter_present?

  input_row = inner_h - 1 if filter_present
  counts_row =
    if counts_present
      filter_present ? input_row - 1 : inner_h - 1
    end

  list_row = row
  list_end =
    if counts_present
      counts_row
    elsif filter_present
      input_row
    else
      inner_h
    end

  list_h = [list_end - list_row, 0].max

  render_popup_items(
    inner,
    session: session,
    row: list_row,
    height: list_h,
    width: inner_w,
    popup_attr: popup_attr,
    selected_attr: selected_attr,
  )

  render_popup_counts(
    inner,
    session: session,
    row: counts_row,
    width: inner_w,
    attr: counts_attr,
  )

  if filter_present
    render_popup_filter(
      inner,
      session: session,
      row: input_row,
      width: inner_w,
      attr: input_attr,
    )
    cursor_x = session.field.cursor_x.to_i.clamp(0, [inner_w - 1, 0].max)
    win.setpos(1 + input_row, 1 + cursor_x)
  end

  stage_window(win)
rescue RuntimeError => e
  raise unless e.message.include?("closed window") ||
               e.message.include?("already closed window")

  nil
ensure
  inner&.close if inner&.respond_to?(:close)
end

#render_prompt_popup(session:) ⇒ Object 



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
330
331
332
333
334
335
336
337
 
# File 'lib/fatty/renderer/curses.rb', line 278

def render_prompt_popup(session:)
  win = session.win
  return unless win

  width = win.maxx
  height = win.maxy

  win.erase

  frame_attr = pair_attr(:popup_frame, fallback: ::Curses::A_NORMAL)
  popup_attr = pair_attr(:popup, fallback: ::Curses::A_NORMAL)
  input_attr = pair_attr(:popup_input, fallback: ::Curses::A_REVERSE)

  win.attrset(frame_attr)
  draw_popup_frame(win, width: width, height: height)

  if session.title && !session.title.empty?
    win.setpos(0, 2)
    win.addstr(" #{Fatty::Ansi.strip(session.title)} ")
  end

  inner_h = height - 2
  inner_w = width - 2
  return if inner_h <= 0 || inner_w <= 0

  inner = win.derwin(inner_h, inner_w, 1, 1)
  inner.bkgdset(popup_attr) if inner.respond_to?(:bkgdset)
  inner.erase
  inner.attrset(popup_attr)

  input_row = inner_h - 1

  if session.message && !session.message.empty?
    message = Fatty::Ansi.strip(session.message.to_s).tr("\r\n", " ")
    message = Fatty::Ansi.truncate_visible(message, inner_w)

    inner.setpos(0, 0)
    inner.addstr(message.ljust(inner_w))
  end

  render_field_into(
    win: inner,
    field: session.field,
    row: input_row,
    width: inner_w,
    base_role: :popup_input,
    base_attr: input_attr,
    region_attr: pair_attr(:region, fallback: ::Curses::A_REVERSE),
    suggestion_attr: pair_attr(:input_suggestion, fallback: input_attr),
  )

  cursor_x = session.field.cursor_x.to_i.clamp(0, [inner_w - 1, 0].max)
  show_cursor
  win.setpos(1 + input_row, 1 + cursor_x)

  stage_window(inner)
  stage_window(win)
ensure
  inner&.close if inner&.respond_to?(:close)
end

#render_status(status_session) ⇒ Object 



14
15
16
17
18
19
20
 
# File 'lib/fatty/renderer/curses.rb', line 14

def render_status(status_session)
  state = status_state(status_session)
  return if state == @last_status_state

  @last_status_state = state
  draw_status_lines(status_session)
end

#restore_cursor(field) ⇒ Object 



339
340
341
342
343
344
345
346
347
 
# File 'lib/fatty/renderer/curses.rb', line 339

def restore_cursor(field)
  win = context.input_win
  return unless win

  cols = win.respond_to?(:maxx) ? win.maxx : @screen.input_rect.cols
  x = field.cursor_x.to_i.clamp(0, [cols - 1, 0].max)
  win.setpos(0, x)
  stage_window(win)
end

#restore_output_cursor(field, row:) ⇒ Object

Restore cursor into the output window at a specific output-win row. row: is 0..(screen.output_rect.rows-1), NOT an absolute screen row.



358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
 
# File 'lib/fatty/renderer/curses.rb', line 358

def restore_output_cursor(field, row:)
  win = context.output_win
  cols = @screen.cols

  x = field.cursor_x.to_i
  x = x.clamp(0, [cols - 1, 0].max)

  if context.truecolor
    row0 = @screen.output_rect.row
    col0 = @screen.output_rect.col
    cols = @screen.output_rect.cols

    @pending_ansi_draws << {
      type: :cursor,
      row: row0 + row,
      col: col0 + x.clamp(0, [cols - 1, 0].max),
    }
    return
  end
  @frame_touched = true
  win.setpos(row, x)
  stage_window(win)
end

#show_cursor ⇒ Object 



387
388
389
390
 
# File 'lib/fatty/renderer/curses.rb', line 387

def show_cursor
  ::Curses.curs_set(1)
  self
end