unofficial mirror of emacs-devel@gnu.org 
 help / color / mirror / code / Atom feed
blob 0b751071d1ca24927b14910b0ce494efbf7c795b 37116 bytes (raw)
name: lisp/icomplete.el 	 # note: path name is non-authoritative(*)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 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
 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
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
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
139
140
141
142
143
144
145
146
147
148
149
150
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
179
180
181
182
183
184
185
186
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
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
330
331
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
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
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
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
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
530
531
532
533
534
535
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
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
 
;;; icomplete.el --- minibuffer completion incremental feedback -*- lexical-binding: t -*-

;; Copyright (C) 1992-1994, 1997, 1999, 2001-2021 Free Software
;; Foundation, Inc.

;; Author: Ken Manheimer <ken dot manheimer at gmail...>
;; Created: Mar 1993 Ken Manheimer, klm@nist.gov - first release to usenet
;; Keywords: help, abbrev

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; Enabling this package implements a more fine-grained minibuffer
;; completion feedback scheme.  Prospective completions are concisely
;; indicated within the minibuffer itself, with each successive
;; keystroke.

;; See `icomplete-completions' docstring for a description of the
;; icomplete display format.

;; See the `icomplete-minibuffer-setup-hook' docstring for a means to
;; customize icomplete setup for interoperation with other
;; minibuffer-oriented packages.

;; To enable/disable icomplete mode, use the `icomplete-mode' function.

;; Thanks to everyone for their suggestions for refinements of this
;; package.  I particularly have to credit Michael Cook, who
;; implemented an incremental completion style in his 'iswitch'
;; functions that served as a model for icomplete.  Some other
;; contributors: Noah Friedman (restructuring as minor mode), Colin
;; Rafferty (lemacs reconciliation), Lars Lindberg, RMS, and others.

;; klm.

;;; Code:

(require 'rfn-eshadow) ; rfn-eshadow-overlay

(defgroup icomplete nil
  "Show completions dynamically in minibuffer."
  :prefix "icomplete-"
  :link '(info-link "(emacs)Icomplete")
  :group 'minibuffer)

(defcustom icomplete-separator " | "
  "String used by Icomplete to separate alternatives in the minibuffer."
  :type 'string
  :version "24.4")

(defcustom icomplete-hide-common-prefix t
  "When non-nil, hide common prefix from completion candidates.
When nil, show candidates in full."
  :type 'boolean
  :version "24.4")

(defvar icomplete-tidy-shadowed-file-names nil
  "If non-nil, automatically delete superfluous parts of file names.
For example, if the user types ~/ after a long path name,
everything preceding the ~/ is discarded so the interactive
selection process starts again from the user's $HOME.")

(defcustom icomplete-show-matches-on-no-input nil
  "When non-nil, show completions when first prompting for input.
This means to show completions even when the current minibuffer contents
is the same as was the initial input after minibuffer activation.
This also means that if you traverse the list of completions with
commands like `C-.' and just hit RET without typing any
characters, the match under point will be chosen instead of the
default."
  :type 'boolean
  :version "24.4")

(defcustom icomplete-with-completion-tables t
  "Specialized completion tables with which Icomplete should operate.
If this is t, Icomplete operates on all tables.
Otherwise this should be a list of the completion tables (e.g.,
`internal-complete-buffer') on which Icomplete should operate."
  ;; Prior to 24.4, not a user-option, default '(internal-complete-buffer).
  :version "24.4"
  :type '(choice (const :tag "All" t)
		 (repeat function)))

(defface icomplete-first-match '((t :weight bold))
  "Face used by Icomplete for highlighting first match."
  :version "24.4")

;;;_* User Customization variables
(defcustom icomplete-prospects-height 2
  ;; We used to compute how many lines 100 characters would take in
  ;; the current window width, but the return value of `window-width'
  ;; is unreliable on startup (e.g., if we're in daemon mode), so now
  ;; we simply base the default value on an 80 column window.
  "Maximum number of lines to use in the minibuffer."
  :type 'integer
  :version "26.1")

(defcustom icomplete-compute-delay .3
  "Completions-computation stall, used only with large-number completions.
See `icomplete-delay-completions-threshold'."
  :type 'number)

(defcustom icomplete-delay-completions-threshold 400
  "Pending-completions number over which to apply `icomplete-compute-delay'."
  :type 'integer)

(defcustom icomplete-max-delay-chars 3
  "Maximum number of initial chars to apply `icomplete-compute-delay'."
  :type 'integer)

(defvar icomplete-in-buffer nil
  "If non-nil, also use Icomplete when completing in non-mini buffers.")

(defcustom icomplete-minibuffer-setup-hook nil
  "Icomplete-specific customization of minibuffer setup.

This hook is run during minibuffer setup if Icomplete is active.
It is intended for use in customizing Icomplete for interoperation
with other features and packages.  For instance:

  (add-hook \\='icomplete-minibuffer-setup-hook
	     (lambda () (setq-local max-mini-window-height 3)))

will constrain Emacs to a maximum minibuffer height of 3 lines when
icompletion is occurring."
  :type 'hook
  :group 'icomplete)


;;;_* Initialization

;;;_ + Internal Variables
;;;_  = icomplete-eoinput nil
(defvar icomplete-overlay (make-overlay (point-min) (point-min) nil t t)
  "Overlay used to display the list of completions.")

(defvar icomplete--initial-input nil
  "Initial input in the minibuffer when icomplete-mode was activated.
Used to implement the option `icomplete-show-matches-on-no-input'.")

(defun icomplete-pre-command-hook ()
 (let ((non-essential t))
   (icomplete-tidy)))

(defun icomplete-post-command-hook ()
  (let ((non-essential t)) ;E.g. don't prompt for password!
    (icomplete-exhibit)))

(defvar icomplete-minibuffer-map
  (let ((map (make-sparse-keymap)))
    (define-key map [?\M-\t] 'icomplete-force-complete)
    (define-key map [remap minibuffer-complete-and-exit] 'icomplete-ret)
    (define-key map [?\C-j]  'icomplete-force-complete-and-exit)
    (define-key map [?\C-.]  'icomplete-forward-completions)
    (define-key map [?\C-,]  'icomplete-backward-completions)
    map)
  "Keymap used by `icomplete-mode' in the minibuffer.")

(defun icomplete-ret ()
  "Exit minibuffer for icomplete."
  (interactive)
  (if (and icomplete-show-matches-on-no-input
           (car completion-all-sorted-completions)
           (equal (icomplete--field-string) icomplete--initial-input))
      (icomplete-force-complete-and-exit)
    (minibuffer-complete-and-exit)))

(defun icomplete-force-complete-and-exit ()
  "Complete the minibuffer with the longest possible match and exit.
Use the first of the matches if there are any displayed, and use
the default otherwise."
  (interactive)
  ;; This function is tricky.  The mandate is to "force", meaning we
  ;; should take the first possible valid completion for the input.
  ;; However, if there is no input and we can prove that that
  ;; coincides with the default, it is much faster to just call
  ;; `minibuffer-complete-and-exit'.  Otherwise, we have to call
  ;; `minibuffer-force-complete-and-exit', which needs the full
  ;; completion set and is potentially slow and blocking.  Do the
  ;; latter if:
  (if (or
       ;; there's some input, meaning the default in off the table by
       ;; definition; OR
       (not (equal (icomplete--field-string) icomplete--initial-input))
       ;; there's no input, but there's also no minibuffer default
       ;; (and the user really wants to see completions on no input,
       ;; meaning he expects a "force" to be at least attempted); OR
       (and (not minibuffer-default)
            icomplete-show-matches-on-no-input)
       ;; there's no input but the full completion set has been
       ;; calculated, This causes the first cached completion to
       ;; be taken (i.e. the one that the user sees highlighted)
       completion-all-sorted-completions)
      (minibuffer-force-complete-and-exit)
    ;; Otherwise take the faster route...
    (minibuffer-complete-and-exit)))

(defun icomplete-force-complete ()
  "Complete the icomplete minibuffer."
  (interactive)
  ;; We're not at all interested in cycling here (bug#34077).
  (minibuffer-force-complete nil nil 'dont-cycle))

(defun icomplete-forward-completions ()
  "Step forward completions by one entry.
Second entry becomes the first and can be selected with
`icomplete-force-complete-and-exit'."
  (interactive)
  (let* ((beg (icomplete--field-beg))
         (end (icomplete--field-end))
         (comps (completion-all-sorted-completions beg end))
	 (last (last comps)))
    (when comps
      (setcdr last (cons (car comps) (cdr last)))
      (completion--cache-all-sorted-completions beg end (cdr comps)))))

(defun icomplete-backward-completions ()
  "Step backward completions by one entry.
Last entry becomes the first and can be selected with
`icomplete-force-complete-and-exit'."
  (interactive)
  (let* ((beg (icomplete--field-beg))
         (end (icomplete--field-end))
         (comps (completion-all-sorted-completions beg end))
	 (last-but-one (last comps 2))
	 (last (cdr last-but-one)))
    (when (consp last)		      ; At least two elements in comps
      (setcdr last-but-one (cdr last))
      (push (car last) comps)
      (completion--cache-all-sorted-completions beg end comps))))

;;; Helpers for `fido-mode' (or `ido-mode' emulation)
;;;
(defun icomplete-fido-kill ()
  "Kill line or current completion, like `ido-mode'.
If killing to the end of line make sense, call `kill-line',
otherwise kill the currently selected completion candidate.
Exactly what killing entails is dependent on the things being
completed.  If completing files, it means delete the file.  If
completing buffers it means kill the buffer.  Both actions
require user confirmation."
  (interactive)
  (let ((end (icomplete--field-end)))
    (if (< (point) end)
        (call-interactively 'kill-line)
      (let* ((all (completion-all-sorted-completions))
             (thing (car all))
             (action
              (pcase (icomplete--category)
                (`buffer
                 (lambda ()
                   (when (yes-or-no-p (concat "Kill buffer " thing "? "))
                     (kill-buffer thing))))
                (`file
                 (lambda ()
                   (let* ((dir (file-name-directory (icomplete--field-string)))
                          (path (expand-file-name thing dir)))
                     (when (yes-or-no-p (concat "Delete file " path "? "))
                       (delete-file path) t)))))))
        (when (let (;; Allow `yes-or-no-p' to work and don't let it
                    ;; `icomplete-exhibit' anything.
                    (enable-recursive-minibuffers t)
                    (icomplete-mode nil))
                (funcall action))
          (completion--cache-all-sorted-completions
           (icomplete--field-beg)
           (icomplete--field-end)
           (cdr all)))
        (message nil)))))

(defun icomplete-fido-delete-char ()
  "Delete char or maybe call `dired', like `ido-mode'."
  (interactive)
  (let ((end (icomplete--field-end)))
    (if (or (< (point) end) (not (eq (icomplete--category) 'file)))
        (call-interactively 'delete-char)
      (dired (file-name-directory (icomplete--field-string)))
      (exit-minibuffer))))

(defun icomplete-fido-ret ()
  "Exit minibuffer or enter directory, like `ido-mode'."
  (interactive)
  (let* ((dir (and (eq (icomplete--category) 'file)
                   (file-name-directory (icomplete--field-string))))
         (current (car completion-all-sorted-completions))
         (probe (and dir current
                     (expand-file-name (directory-file-name current) dir))))
    (cond ((and probe (file-directory-p probe) (not (string= current "./")))
           (icomplete-force-complete))
          (t
           (icomplete-force-complete-and-exit)))))

(defun icomplete-fido-exit (force)
  "Attempt to exit minibuffer immediately with current input.
Unless FORCE is non-nil (interactively with a prefix argument),
honour a non-nil REQUIRE-MATCH argument to `completing-read' by
trying to complete as much as possible and disallowing the exit
if that doesn't produce a completion match."
  (interactive "P")
  (if (and (not force) minibuffer--require-match)
      (minibuffer-complete-and-exit)
    (exit-minibuffer)))

(defun icomplete-fido-backward-updir ()
  "Delete char before or go up directory, like `ido-mode'."
  (interactive)
  (if (and (eq (char-before) ?/)
           (eq (icomplete--category) 'file))
      (save-excursion
        (goto-char (1- (point)))
        (when (search-backward "/" (point-min) t)
          (delete-region (1+ (point)) (point-max))))
    (call-interactively 'backward-delete-char)))

(defvar icomplete-fido-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map (kbd "C-k") 'icomplete-fido-kill)
    (define-key map (kbd "C-d") 'icomplete-fido-delete-char)
    (define-key map (kbd "RET") 'icomplete-fido-ret)
    (define-key map (kbd "C-m") 'icomplete-fido-ret)
    (define-key map (kbd "DEL") 'icomplete-fido-backward-updir)
    (define-key map (kbd "M-j") 'icomplete-fido-exit)
    (define-key map (kbd "C-s") 'icomplete-forward-completions)
    (define-key map (kbd "C-r") 'icomplete-backward-completions)
    (define-key map (kbd "<right>") 'icomplete-forward-completions)
    (define-key map (kbd "<left>") 'icomplete-backward-completions)
    (define-key map (kbd "C-.") 'icomplete-forward-completions)
    (define-key map (kbd "C-,") 'icomplete-backward-completions)
    map)
  "Keymap used by `fido-mode' in the minibuffer.")

(defun icomplete--fido-mode-setup ()
  "Setup `fido-mode''s minibuffer."
  (when (and icomplete-mode (icomplete-simple-completing-p))
    (use-local-map (make-composed-keymap icomplete-fido-mode-map
                                         (current-local-map)))
    (setq-local icomplete-tidy-shadowed-file-names t
                icomplete-show-matches-on-no-input t
                icomplete-hide-common-prefix nil
                completion-styles '(flex)
                completion-flex-nospace nil
                completion-category-defaults nil
                completion-ignore-case t
                read-buffer-completion-ignore-case t
                read-file-name-completion-ignore-case t)))

;;;###autoload
(define-minor-mode fido-mode
  "An enhanced `icomplete-mode' that emulates `ido-mode'.

This global minor mode makes minibuffer completion behave
more like `ido-mode' than regular `icomplete-mode'."
  :global t :group 'icomplete
  (remove-hook 'minibuffer-setup-hook #'icomplete-minibuffer-setup)
  (remove-hook 'minibuffer-setup-hook #'icomplete--fido-mode-setup)
  (when fido-mode
    (icomplete-mode -1)
    (setq icomplete-mode t)
    (add-hook 'minibuffer-setup-hook #'icomplete-minibuffer-setup)
    (add-hook 'minibuffer-setup-hook #'icomplete--fido-mode-setup)))

;;;_ > icomplete-mode (&optional prefix)
;;;###autoload
(define-minor-mode icomplete-mode
  "Toggle incremental minibuffer completion (Icomplete mode).

When this global minor mode is enabled, typing in the minibuffer
continuously displays a list of possible completions that match
the string you have typed.  See `icomplete-completions' for a
description of how prospective completions are displayed.

For more information, see Info node `(emacs)Icomplete'.
For options you can set, `\\[customize-group] icomplete'.

You can use the following key bindings to navigate and select
completions:

\\{icomplete-minibuffer-map}"
  :global t :group 'icomplete
  (remove-hook 'minibuffer-setup-hook #'icomplete-minibuffer-setup)
  (remove-hook 'completion-in-region-mode-hook #'icomplete--in-region-setup)
  (when icomplete-mode
    (fido-mode -1)
    (when icomplete-in-buffer
      (add-hook 'completion-in-region-mode-hook #'icomplete--in-region-setup))
    (add-hook 'minibuffer-setup-hook #'icomplete-minibuffer-setup)))

(defun icomplete--completion-table ()
  (if (window-minibuffer-p) minibuffer-completion-table
    (or (nth 2 completion-in-region--data)
	(message "In %S (w=%S): %S"
		 (current-buffer) (selected-window) (window-minibuffer-p)))))
(defun icomplete--completion-predicate ()
  (if (window-minibuffer-p) minibuffer-completion-predicate
    (nth 3 completion-in-region--data)))
(defun icomplete--field-string ()
  (if (window-minibuffer-p) (minibuffer-contents)
    (buffer-substring-no-properties
     (nth 0 completion-in-region--data)
     (nth 1 completion-in-region--data))))
(defun icomplete--field-beg ()
  (if (window-minibuffer-p) (minibuffer-prompt-end)
    (nth 0 completion-in-region--data)))
(defun icomplete--field-end ()
  (if (window-minibuffer-p) (point-max)
    (nth 1 completion-in-region--data)))
(defun icomplete--category ()
  (let* ((beg (icomplete--field-beg))
         (md (completion--field-metadata beg)))
    (alist-get 'category (cdr md))))

;;;_ > icomplete-simple-completing-p ()
(defun icomplete-simple-completing-p ()
  "Non-nil if current window is a minibuffer that's doing simple completion.

Conditions are:
   the selected window is a minibuffer,
   and not in the middle of macro execution,
   and the completion table is not a function (which would
       indicate some non-standard, non-simple completion mechanism,
       like file-name and other custom-func completions),
   and `icomplete-with-completion-tables' doesn't restrict completion."

  (unless executing-kbd-macro
    (let ((table (icomplete--completion-table)))
      (and table
           (or (not (functionp table))
               (eq icomplete-with-completion-tables t)
               (member table icomplete-with-completion-tables))))))

;;;_ > icomplete-minibuffer-setup ()
(defun icomplete-minibuffer-setup ()
  "Run in minibuffer on activation to establish incremental completion.
Usually run by inclusion in `minibuffer-setup-hook'."
  (when (and icomplete-mode (icomplete-simple-completing-p))
    (setq-local icomplete--initial-input (icomplete--field-string))
    (setq-local completion-show-inline-help nil)
    (use-local-map (make-composed-keymap icomplete-minibuffer-map
    					 (current-local-map)))
    (add-hook 'pre-command-hook  #'icomplete-pre-command-hook  nil t)
    (add-hook 'post-command-hook #'icomplete-post-command-hook nil t)
    (run-hooks 'icomplete-minibuffer-setup-hook)))

(defvar icomplete--in-region-buffer nil)

(defun icomplete--in-region-setup ()
  (when (or (not completion-in-region-mode)
	    (and icomplete--in-region-buffer
		 (not (eq icomplete--in-region-buffer (current-buffer)))))
    (with-current-buffer (or icomplete--in-region-buffer (current-buffer))
      (setq icomplete--in-region-buffer nil)
      (delete-overlay icomplete-overlay)
      (kill-local-variable 'completion-show-inline-help)
      (remove-hook 'pre-command-hook  'icomplete-pre-command-hook  t)
      (remove-hook 'post-command-hook 'icomplete-post-command-hook t)
      (message nil)))
  (when (and completion-in-region-mode
	     icomplete-mode (icomplete-simple-completing-p))
    (setq icomplete--in-region-buffer (current-buffer))
    (setq-local completion-show-inline-help nil)
    (let ((tem (assq 'completion-in-region-mode
		     minor-mode-overriding-map-alist)))
      (unless (memq icomplete-minibuffer-map (cdr tem))
	(setcdr tem (make-composed-keymap icomplete-minibuffer-map
					  (cdr tem)))))
    (add-hook 'pre-command-hook  'icomplete-pre-command-hook  nil t)
    (add-hook 'post-command-hook 'icomplete-post-command-hook nil t)))

(defun icomplete--sorted-completions ()
  (or completion-all-sorted-completions
      (cl-loop
       with beg = (icomplete--field-beg)
       with end = (icomplete--field-end)
       with all = (completion-all-sorted-completions beg end)
       ;; Icomplete mode re-sorts candidates, bubbling the default to
       ;; top if it's found somewhere down the list.  This loop's
       ;; iteration variable, `fn' iterates through these "bubble up
       ;; predicates" which may vary depending on specific
       ;; `completing-read' invocations, described below:
       for fn in (cond ((and minibuffer-default
                             (stringp minibuffer-default) ; bug#38992
                             (equal (icomplete--field-string) icomplete--initial-input))
                        ;; Here, we have a non-nil string default and
                        ;; no input whatsoever.  We want to make sure
                        ;; that the default is bubbled to the top so
                        ;; that `icomplete-force-complete-and-exit'
                        ;; will select it.  We want to do that even if
                        ;; the match doesn't match the completion
                        ;; perfectly.
                        ;;
                        `(;; The first predicate ensures that:
                          ;;
                          ;; (completing-read "thing? " '("foo" "bar")
                          ;;                  nil nil nil nil "bar")
                          ;;
                          ;; Has "bar" at the top, so RET will select
                          ;; it, as desired.
                          ,(lambda (comp)
                             (equal minibuffer-default comp))
                          ;; Why do we need this second predicate?
                          ;; Because that'll make things like M-x man
                          ;; RET RET, when invoked with point on the
                          ;; "bar" word, behave correctly.  There, the
                          ;; default doesn't quite match any
                          ;; candidate. So:
                          ;;
                          ;; (completing-read "Man entry? " '("foo(1)" "bar(1)")
                          ;;                  nil nil nil nil "bar")
                          ;;
                          ;; Will place "bar(1)" on top, and RET will
                          ;; select it -- again, as desired.
                          ;;
                          ;; FIXME: it's arguable that this second
                          ;; behaviour should be a property of the
                          ;; completion table and not the completion
                          ;; frontend such as we have done
                          ;; here. However, it seems generically
                          ;; useful for a very broad spectrum of
                          ;; cases.
                          ,(lambda (comp)
                             (string-prefix-p minibuffer-default comp))))
                       ((and fido-mode
                             (not minibuffer-default)
                             (eq (icomplete--category) 'file))
                        ;; When there isn't a default, `fido-mode'
                        ;; specifically also has some extra
                        ;; file-sorting semantics inherited from Ido.
                        ;; Those make the directory "./" bubble to the
                        ;; top (if it exists).  This makes M-x dired
                        ;; RET RET go to the directory of current
                        ;; file, which is non-Icomplete vanilla Emacs
                        ;; and `ido-mode' both do.
                        `(,(lambda (comp)
                             (string= "./" comp)))))
       ;; After we have setup the predicates, look for a completion
       ;; matching one of them and bubble up it, destructively on
       ;; `completion-all-sorted-completions' (unless that completion
       ;; happens to be already on top).
       thereis (or
                (and (funcall fn (car all)) all)
                (cl-loop
                 for l on all
                 while (consp (cdr l))
                 for comp = (cadr l)
                 when (funcall fn comp)
                 do (setf (cdr l) (cddr l))
                 and return
                 (completion--cache-all-sorted-completions beg end (cons comp all))))
       finally return all)))

(defun icomplete-vertical-reformat-completions (completions)
  "Reformat the completion candidates returned by `icomplete-completions'."
  (save-match-data
    (if (string-match "^\\((.*)\\|\\[.*\\]\\)?{\\(\\(?:.\\|\n\\)+\\)}"
                      completions)
        (format "%s \n%s"
                (or (match-string 1 completions) "")
                (match-string 2 completions))
      completions)))

(defun icomplete-vertical-minibuffer-setup ()
  "Setup the minibuffer for vertical display of completion candidates."
  (setq-local redisplay-adhoc-scroll-in-resize-mini-windows nil))

;;;###autoload
(define-minor-mode icomplete-vertical-mode
  "Toggle incremental minibuffer completion with vertical display.

This global minor mode is identical to `icomplete-mode' (which see),
except that it displays the list of completions candidates vertically.

As many completion candidates as possible are displayed, depending on
the value of `max-mini-window-height'."
  :global t :group 'icomplete
  (remove-hook 'icomplete-minibuffer-setup-hook
               #'icomplete-vertical-minibuffer-setup)
  (advice-remove 'icomplete-completions
                 #'icomplete-vertical-reformat-completions)
  (icomplete-mode -1)
  (when icomplete-vertical-mode
    (icomplete-mode 1)
    (setq icomplete-separator "\n")
    (setq icomplete-hide-common-prefix nil)
    ;; ask `icomplete-completions' to return enough completions candidates
    (setq icomplete-prospects-height 25)
    (add-hook 'icomplete-minibuffer-setup-hook
              #'icomplete-vertical-minibuffer-setup)
    (advice-add 'icomplete-completions
                :filter-return #'icomplete-vertical-reformat-completions)))

\f


;;;_* Completion

;;;_ > icomplete-tidy ()
(defun icomplete-tidy ()
  "Remove completions display (if any) prior to new user input.
Should be run in on the minibuffer `pre-command-hook'.
See `icomplete-mode' and `minibuffer-setup-hook'."
  (delete-overlay icomplete-overlay))

;;;_ > icomplete-exhibit ()
(defun icomplete-exhibit ()
  "Insert Icomplete completions display.
Should be run via minibuffer `post-command-hook'.
See `icomplete-mode' and `minibuffer-setup-hook'."
  (when (and icomplete-mode
             (icomplete-simple-completing-p)) ;Shouldn't be necessary.
    (let ((saved-point (point)))
      (save-excursion
        (goto-char (point-max))
                                        ; Insert the match-status information:
        (when (and (or icomplete-show-matches-on-no-input
                       (not (equal (icomplete--field-string)
                                   icomplete--initial-input)))
                   (or
                    ;; Don't bother with delay after certain number of chars:
                    (> (- (point) (icomplete--field-beg))
                       icomplete-max-delay-chars)
                    ;; Don't delay if the completions are known.
                    completion-all-sorted-completions
                    ;; Don't delay if alternatives number is small enough:
                    (and (sequencep (icomplete--completion-table))
                         (< (length (icomplete--completion-table))
                            icomplete-delay-completions-threshold))
                    ;; Delay - give some grace time for next keystroke, before
                    ;; embarking on computing completions:
                    (sit-for icomplete-compute-delay)))
          (when (and
                 icomplete-tidy-shadowed-file-names
                 (eq (icomplete--category) 'file)
                 rfn-eshadow-overlay (overlay-buffer rfn-eshadow-overlay)
                 (eq this-command 'self-insert-command)
                 (= saved-point (icomplete--field-end))
                 (or (>= (- (point) (overlay-end rfn-eshadow-overlay)) 2)
                     (eq ?/ (char-before (- (point) 2)))))
            (delete-region (overlay-start rfn-eshadow-overlay)
                           (overlay-end rfn-eshadow-overlay)))
          (let* ((field-string (icomplete--field-string))
                 ;; Not sure why, but such requests seem to come
                 ;; every once in a while.  It's not fully
                 ;; deterministic but `C-x C-f M-DEL M-DEL ...'
                 ;; seems to trigger it fairly often!
                 (while-no-input-ignore-events '(selection-request))
                 (text (while-no-input
                         (icomplete-completions
                          field-string
                          (icomplete--completion-table)
                          (icomplete--completion-predicate)
                          (if (window-minibuffer-p)
                              (eq minibuffer--require-match t)))))
                 (buffer-undo-list t)
                 deactivate-mark)
            ;; Do nothing if while-no-input was aborted.
            (when (stringp text)
              (move-overlay icomplete-overlay (point) (point) (current-buffer))
              ;; The current C cursor code doesn't know to use the overlay's
              ;; marker's stickiness to figure out whether to place the cursor
              ;; before or after the string, so let's spoon-feed it the pos.
              (put-text-property 0 1 'cursor t text)
              (overlay-put icomplete-overlay 'after-string text))))))))

;;;_ > icomplete-completions (name candidates predicate require-match)
(defun icomplete-completions (name candidates predicate require-match)
  "Identify prospective candidates for minibuffer completion.

The display is updated with each minibuffer keystroke during
minibuffer completion.

Prospective completion suffixes (if any) are displayed, bracketed by
one of (), [], or {} pairs.  The choice of brackets is as follows:

  (...) - a single prospect is identified and matching is enforced,
  [...] - a single prospect is identified but matching is optional, or
  {...} - multiple prospects, separated by commas, are indicated, and
          further input is required to distinguish a single one.

If there are multiple possibilities, `icomplete-separator' separates them.

The displays for unambiguous matches have ` [Matched]' appended
\(whether complete or not), or ` [No matches]', if no eligible
matches exist."
  (let* ((ignored-extension-re
          (and minibuffer-completing-file-name
               icomplete-with-completion-tables
               completion-ignored-extensions
               (concat "\\(?:\\`\\.\\./\\|"
                       (regexp-opt completion-ignored-extensions)
                       "\\)\\'")))
         (minibuffer-completion-table candidates)
	 (minibuffer-completion-predicate
          (if ignored-extension-re
              (lambda (cand)
                (and (not (string-match ignored-extension-re cand))
                     (or (null predicate)
                         (funcall predicate cand))))
            predicate))
	 (md (completion--field-metadata (icomplete--field-beg)))
	 (comps (icomplete--sorted-completions))
         (last (if (consp comps) (last comps)))
         (base-size (cdr last))
         (open-bracket (if require-match "(" "["))
         (close-bracket (if require-match ")" "]")))
    ;; `concat'/`mapconcat' is the slow part.
    (if (not (consp comps))
	(progn ;;(debug (format "Candidates=%S field=%S" candidates name))
	  (format " %sNo matches%s" open-bracket close-bracket))
      (if last (setcdr last nil))
      (let* ((most-try
              (if (and base-size (> base-size 0))
                  (completion-try-completion
                   name candidates predicate (length name) md)
                ;; If the `comps' are 0-based, the result should be
                ;; the same with `comps'.
                (completion-try-completion
                 name comps nil (length name) md)))
	     (most (if (consp most-try) (car most-try)
                     (if most-try (car comps) "")))
             ;; Compare name and most, so we can determine if name is
             ;; a prefix of most, or something else.
	     (compare (compare-strings name nil nil
				       most nil nil completion-ignore-case))
	     (ellipsis (if (char-displayable-p ?…) "…" "..."))
	     (determ (unless (or (eq t compare) (eq t most-try)
				 (= (setq compare (1- (abs compare)))
				    (length most)))
		       (concat open-bracket
			       (cond
				((= compare (length name))
                                 ;; Typical case: name is a prefix.
				 (substring most compare))
                                ;; Don't bother truncating if it doesn't gain
                                ;; us at least 2 columns.
				((< compare (+ 2 (string-width ellipsis))) most)
				(t (concat ellipsis (substring most compare))))
			       close-bracket)))
	     ;;"-prospects" - more than one candidate
	     (prospects-len (+ (string-width
				(or determ (concat open-bracket close-bracket)))
			       (string-width icomplete-separator)
			       (+ 2 (string-width ellipsis)) ;; take {…} into account
			       (string-width (buffer-string))))
             (prospects-max
              ;; Max total length to use, including the minibuffer content.
              (* (+ icomplete-prospects-height
                    ;; If the minibuffer content already uses up more than
                    ;; one line, increase the allowable space accordingly.
                    (/ prospects-len (window-width)))
                 (window-width)))
             ;; Find the common prefix among `comps'.
             ;; We can't use the optimization below because its assumptions
             ;; aren't always true, e.g. when completion-cycling (bug#10850):
             ;; (if (eq t (compare-strings (car comps) nil (length most)
             ;; 			 most nil nil completion-ignore-case))
             ;;     ;; Common case.
             ;;     (length most)
             ;; Else, use try-completion.
	     (prefix (when icomplete-hide-common-prefix
		       (try-completion "" comps)))
             (prefix-len
	      (and (stringp prefix)
                   ;; Only hide the prefix if the corresponding info
                   ;; is already displayed via `most'.
                   (string-prefix-p prefix most t)
                   (length prefix))) ;;)
	     prospects comp limit)
	(if (or (eq most-try t) (not (consp (cdr comps))))
	    (setq prospects nil)
	  (when (member name comps)
	    ;; NAME is complete but not unique.  This scenario poses
	    ;; following UI issues:
	    ;;
	    ;; - When `icomplete-hide-common-prefix' is non-nil, NAME
	    ;;   is stripped empty.  This would make the entry
	    ;;   inconspicuous.
	    ;;
	    ;; - Due to sorting of completions, NAME may not be the
	    ;;   first of the prospects and could be hidden deep in
	    ;;   the displayed string.
	    ;;
	    ;; - Because of `icomplete-prospects-height' , NAME may
	    ;;   not even be displayed to the user.
	    ;;
	    ;; To circumvent all the above problems, provide a visual
	    ;; cue to the user via an "empty string" in the try
	    ;; completion field.
	    (setq determ (concat open-bracket "" close-bracket)))
	  ;; Compute prospects for display.
	  (while (and comps (not limit))
	    (setq comp
		  (if prefix-len (substring (car comps) prefix-len) (car comps))
		  comps (cdr comps))
	    (setq prospects-len
                  (+ (string-width comp)
		     (string-width icomplete-separator)
		     prospects-len))
	    (if (< prospects-len prospects-max)
		(push comp prospects)
	      (setq limit t))))
	(setq prospects (nreverse prospects))
	;; Decorate first of the prospects.
	(when prospects
	  (let ((first (copy-sequence (pop prospects))))
	    (put-text-property 0 (length first)
			       'face 'icomplete-first-match first)
	    (push first prospects)))
        ;; Restore the base-size info, since completion-all-sorted-completions
        ;; is cached.
        (if last (setcdr last base-size))
	(if prospects
	    (concat determ
		    "{"
		    (mapconcat 'identity prospects icomplete-separator)
		    (and limit (concat icomplete-separator ellipsis))
		    "}")
	  (concat determ " [Matched]"))))))

;;; Iswitchb compatibility

;; We moved Iswitchb to `obsolete' in 24.4, but autoloads in files in
;; `obsolete' aren't obeyed (since that would encourage people to keep using
;; those packages, oblivious to their obsolescence).  Given the fact that
;; Iswitchb was very popular, we decided to keep its autoload for a bit longer,
;; so we moved it here.

;;;###autoload(when (locate-library "obsolete/iswitchb")
;;;###autoload  (autoload 'iswitchb-mode "iswitchb" "Toggle Iswitchb mode." t)
;;;###autoload  (make-obsolete 'iswitchb-mode
;;;###autoload    "use `icomplete-mode' or `ido-mode' instead." "24.4"))

;;;_* Provide
(provide 'icomplete)

;;_* Local emacs vars.
;;Local variables:
;;allout-layout: (-2 :)
;;End:

;;; icomplete.el ends here

debug log:

solving 87b3431079 ...
found 87b3431079 in https://yhetil.org/emacs-devel/dff0cccf05b51da8e080@heytings.org/
found da589c0064 in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 da589c00649dc0e69cf25bf3bfca6f8ab3f72d88	lisp/icomplete.el

applying [1/1] https://yhetil.org/emacs-devel/dff0cccf05b51da8e080@heytings.org/
diff --git a/lisp/icomplete.el b/lisp/icomplete.el\r
index da589c0064..87b3431079 100644\r

Checking patch lisp/icomplete.el...
Applied patch lisp/icomplete.el cleanly.

index at:
100644 0b751071d1ca24927b14910b0ce494efbf7c795b	lisp/icomplete.el

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).