summaryrefslogtreecommitdiff
path: root/lisp/dabbrev.el
blob: b5ae7ac3b71b66caee8202d27252c95dcb9fdb77 (plain)
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
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
;;; dabbrev.el --- dynamic abbreviation package

;; Copyright (C) 1985, 1986, 1992, 1994, 1996, 1997, 2000, 2001, 2002,
;;   2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.

;; Author: Don Morrison
;; Maintainer: Lars Lindberg <Lars.Lindberg@sypro.cap.se>
;; Created: 16 Mars 1992
;; Lindberg's last update version: 5.7
;; Keywords: abbrev expand completion convenience

;; 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, 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; The purpose with this package is to let you write just a few
;; characters of words you've written earlier to be able to expand
;; them.
;;
;; To expand a word, just put the point right after the word and press
;; M-/ (dabbrev-expand) or M-C-/ (dabbrev-completion).
;;
;; Check out the customizable variables below to learn about all the
;; features of this package.

;;; Hints and tips for major modes writers:

;; Recommended values		C/Lisp etc	text
;; dabbrev-case-fold-search	nil		t
;; dabbrev-case-replace		nil		t
;;
;; Set the variables you want special for your mode like this:
;; (set (make-local-variable 'dabbrev-case-replace) nil)
;; Then you don't interfere with other modes.
;;
;; If your mode handles buffers that refers to other buffers
;; (i.e. compilation-mode, gud-mode), then try to set
;; `dabbrev-select-buffers-function' or `dabbrev-friend-buffer-function'
;; to a function that point out those buffers.

;; Same goes for major-modes that are connected to other modes.  There
;; are for instance a number of mail-modes.  One for reading, one for
;; creating a new mail etc.  Maybe those should be connected.

;; Example for GNUS (when we write a reply, we want dabbrev to look in
;; the article for expansion):
;; (set (make-local-variable 'dabbrev-friend-buffer-function)
;;      (lambda (buffer)
;;         (save-excursion
;;           (set-buffer buffer)
;;           (memq major-mode '(news-reply-mode gnus-article-mode)))))


;; Known bugs and limitations.
;; - Possible to do several levels of `dabbrev-completion' in the
;;   minibuffer.
;; - dabbrev-completion doesn't handle resetting the globals variables
;;   right.  It resets them after finding the abbrev.

;; Future enhancements
;;  - Check the tags-files? Like tags-complete?
;;  - Add the possibility of searching both forward and backward to
;;    the nearest expansion.
;;  - Check the kill-ring when everything else fails.  (Maybe something
;;  for hippie-expand?).  [Bng] <boris@cs.rochester.edu>

;;; These people gave suggestions:
;;  [hymie]	Hyman Rosen <marks!hymie@jyacc.jyacc.com>
;;  [burgett]	Steve Burgett <burgett@bizet.eecs.berkeley.edu>
;;  [jules]	Julian Gosnell <jules@x.co.uk>
;;  [kifer]	Michael Kifer <kifer@sbcs.sunysb.edu>
;;  [ake]	Ake Stenhoff <extaksf@aom.ericsson.se>
;;  [alon]	Alon Albert <al%imercury@uunet.uu.net>
;;  [tromey]	Tom Tromey <tromey@busco.lanl.gov>
;;  [Rolf]	Rolf Schreiber <rolf@mathematik.uni-stuttgart.de>
;;  [Petri]	Petri Raitio <per@tekla.fi>
;;  [ejb]	Jay Berkenbilt <ejb@ql.org>
;;  [hawley]	Bob Hawley <rth1@quartet.mt.att.com>
;;  ... and to all the people who have participated in the beta tests.

;;; Code:

;;----------------------------------------------------------------
;; Customization variables
;;----------------------------------------------------------------

(defgroup dabbrev nil
  "Dynamic Abbreviations."
  :tag "Dynamic Abbreviations"
  :group 'abbrev
  :group 'convenience)

(defcustom dabbrev-backward-only nil
  "*If non-nil, `dabbrev-expand' only looks backwards."
  :type 'boolean
  :group 'dabbrev)

(defcustom dabbrev-limit nil
  "*Limits region searched by `dabbrev-expand' to this many chars away."
  :type '(choice (const :tag "off" nil)
		 integer)
  :group 'dabbrev)

(defcustom dabbrev-abbrev-skip-leading-regexp nil
  "*Regexp for skipping leading characters of an abbreviation.

Example: Set this to \"\\\\$\" for programming languages
in which variable names may appear with or without a leading `$'.
\(For example, in Makefiles.\)

Set this to nil if no characters should be skipped."
  :type '(choice regexp
		 (const :tag "off" nil))
  :group 'dabbrev)

(defcustom dabbrev-eliminate-newlines t
  "*Non-nil means dabbrev should not insert newlines.
Instead it converts them to spaces."
  :type 'boolean
  :group 'dabbrev)

(defcustom dabbrev-case-fold-search 'case-fold-search
  "*Control whether dabbrev searches should ignore case.
A value of nil means case is significant.
A value of `case-fold-search' means case is significant
 if `case-fold-search' is nil.
Any other non-nil version means case is not significant."
  :type '(choice (const :tag "off" nil)
		 (const :tag "like search" case-fold-search)
		 (other :tag "on" t))
  :group 'dabbrev)

(defcustom dabbrev-upcase-means-case-search nil
  "*The significance of an uppercase character in an abbreviation.
A nil value means case fold search when searching for possible expansions;
non-nil means case sensitive search.

This variable has an effect only when the value of
`dabbrev-case-fold-search' says to ignore case."
  :type 'boolean
  :group 'dabbrev)

(defcustom dabbrev-case-distinction 'case-replace
  "*Whether dabbrev treats expansions as the same if they differ in case.

A value of nil means treat them as different.
A value of `case-replace' means distinguish them if `case-replace' is nil.
Any other non-nil value means to treat them as the same.

This variable has an effect only when the value of
`dabbrev-case-fold-search' specifies to ignore case."
  :type '(choice (const :tag "off" nil)
		 (const :tag "based on `case-replace'" case-replace)
		 (other :tag "on" t))
  :group 'dabbrev
  :version "22.1")

(defcustom dabbrev-case-replace 'case-replace
  "*Whether dabbrev applies the abbreviations's case pattern to the expansion.

A value of nil means preserve the expansion's case pattern.
A value of `case-replace' means preserve it if `case-replace' is nil.
Any other non-nil value means modify the expansion
by applying the abbreviation's case pattern to it.

This variable has an effect only when the value of
`dabbrev-case-fold-search' specifies to ignore case."
  :type '(choice (const :tag "off" nil)
		 (const :tag "based on `case-replace'" case-replace)
		 (other :tag "on" t))
  :group 'dabbrev)

(defcustom dabbrev-abbrev-char-regexp nil
  "*Regexp to recognize a character in an abbreviation or expansion.
This regexp will be surrounded with \\\\( ... \\\\) when actually used.

Set this variable to \"\\\\sw\" if you want ordinary words or
\"\\\\sw\\\\|\\\\s_\" if you want symbols (including characters whose
syntax is \"symbol\" as well as those whose syntax is \"word\".

The value nil has a special meaning: the abbreviation is from point to
previous word-start, but the search is for symbols.

For instance, if you are programming in Lisp, `yes-or-no-p' is a symbol,
while `yes', `or', `no' and `p' are considered words.  If this
variable is nil, then expanding `yes-or-no-' looks for a symbol
starting with or containing `no-'.  If you set this variable to
\"\\\\sw\\\\|\\\\s_\", that expansion looks for a symbol starting with
`yes-or-no-'.  Finally, if you set this variable to \"\\\\sw\", then
expanding `yes-or-no-' signals an error because `-' is not part of a word;
but expanding `yes-or-no' looks for a word starting with `no'.

The recommended value is \"\\\\sw\\\\|\\\\s_\"."
  :type '(choice (const nil)
		 regexp)
  :group 'dabbrev)

(defcustom dabbrev-check-all-buffers t
  "*Non-nil means dabbrev package should search *all* buffers.

Dabbrev always searches the current buffer first.  Then, if
`dabbrev-check-other-buffers' says so, it searches the buffers
designated by `dabbrev-select-buffers-function'.

Then, if `dabbrev-check-all-buffers' is non-nil, dabbrev searches
all the other buffers, except those named in `dabbrev-ignored-buffer-names',
or matched by `dabbrev-ignored-regexps'."
  :type 'boolean
  :group 'dabbrev)

(defcustom dabbrev-ignored-buffer-names '("*Messages*" "*Buffer List*")
  "*List of buffer names that dabbrev should not check.
See also `dabbrev-ignored-buffer-regexps'."
  :type '(repeat (string :tag "Buffer name"))
  :group 'dabbrev
  :version "20.3")

(defcustom dabbrev-ignored-buffer-regexps nil
  "*List of regexps matching names of buffers that dabbrev should not check.
See also `dabbrev-ignored-buffer-names'."
  :type '(repeat regexp)
  :group 'dabbrev
  :version "21.1")

(defcustom dabbrev-check-other-buffers t
  "*Should \\[dabbrev-expand] look in other buffers?\

nil: Don't look in other buffers.
t: Also look for expansions in the buffers pointed out by
   `dabbrev-select-buffers-function'.
Anything else: When we can't find any more expansions in
the current buffer, then ask the user whether to look in other
buffers too.

The default value is t."
  :type '(choice (const :tag "off" nil)
		 (const :tag "on" t)
		 (other :tag "ask" other))
  :group 'dabbrev)

;; I guess setting this to a function that selects all C- or C++-
;; mode buffers would be a good choice for a debugging buffer,
;; when debugging C- or C++-code.
(defvar dabbrev-select-buffers-function 'dabbrev--select-buffers
  "A function that selects buffers that should be searched by dabbrev.
The function should take no arguments and return a list of buffers to
search for expansions.  See the source of `dabbrev--select-buffers'
for an example.

A mode setting this variable should make it buffer local.")

(defcustom dabbrev-friend-buffer-function 'dabbrev--same-major-mode-p
  "*A function to decide whether dabbrev should search OTHER-BUFFER.
The function should take one argument, OTHER-BUFFER, and return
non-nil if that buffer should be searched.  Have a look at
`dabbrev--same-major-mode-p' for an example.

The value of `dabbrev-friend-buffer-function' has an effect only if
the value of `dabbrev-select-buffers-function' uses it.  The function
`dabbrev--select-buffers' is one function you can use here.

A mode setting this variable should make it buffer local."
  :type 'function
  :group 'dabbrev)

(defcustom dabbrev-search-these-buffers-only nil
  "If non-nil, a list of buffers which dabbrev should search.
If this variable is non-nil, dabbrev will only look in these buffers.
It will not even look in the current buffer if it is not a member of
this list."
  :group 'dabbrev)

;;----------------------------------------------------------------
;; Internal variables
;;----------------------------------------------------------------

;; Last obarray of completions in `dabbrev-completion'
(defvar dabbrev--last-obarray nil)

;; Table of expansions seen so far
(defvar dabbrev--last-table nil)

;; Last string we tried to expand.
(defvar dabbrev--last-abbreviation nil)

;; Location last abbreviation began
(defvar dabbrev--last-abbrev-location nil)

;; Direction of last dabbrevs search
(defvar dabbrev--last-direction 0)

;; Last expansion of an abbreviation.
(defvar dabbrev--last-expansion nil)

;; Location the last expansion was found.
(defvar dabbrev--last-expansion-location nil)

;; The list of remaining buffers with the same mode as current buffer.
(defvar dabbrev--friend-buffer-list nil)

;; The buffer we looked in last, not counting the current buffer.
(defvar dabbrev--last-buffer nil)

;; The buffer we found the expansion last time.
(defvar dabbrev--last-buffer-found nil)

;; The buffer we last did a completion in.
(defvar dabbrev--last-completion-buffer nil)

;; If non-nil, a function to use when copying successive words.
;; It should be `upcase' or `downcase'.
(defvar dabbrev--last-case-pattern nil)

;; Same as dabbrev-check-other-buffers, but is set for every expand.
(defvar dabbrev--check-other-buffers dabbrev-check-other-buffers)

;; The regexp for recognizing a character in an abbreviation.
(defvar dabbrev--abbrev-char-regexp nil)

;; The progress reporter for buffer-scanning progress.
(defvar dabbrev--progress-reporter nil)

;;----------------------------------------------------------------
;; Macros
;;----------------------------------------------------------------

;;; Get the buffer that mini-buffer was activated from
(defsubst dabbrev--minibuffer-origin ()
  (car (cdr (buffer-list))))

;; Make a list of some of the elements of LIST.
;; Check each element of LIST, storing it temporarily in the
;; variable ELEMENT, and include it in the result
;; if CONDITION evaluates non-nil.
(defmacro dabbrev-filter-elements (element list condition)
  `(let (dabbrev-result dabbrev-tail ,element)
    (setq dabbrev-tail ,list)
    (while dabbrev-tail
      (setq ,element (car dabbrev-tail))
      (if ,condition
          (setq dabbrev-result (cons ,element dabbrev-result)))
      (setq dabbrev-tail (cdr dabbrev-tail)))
    (nreverse dabbrev-result)))

;;----------------------------------------------------------------
;; Exported functions
;;----------------------------------------------------------------

;;;###autoload (define-key esc-map "/" 'dabbrev-expand)
;;;??? Do we want this?
;;;###autoload (define-key esc-map [?\C-/] 'dabbrev-completion)

;;;###autoload
(defun dabbrev-completion (&optional arg)
  "Completion on current word.
Like \\[dabbrev-expand] but finds all expansions in the current buffer
and presents suggestions for completion.

With a prefix argument, it searches all buffers accepted by the
function pointed out by `dabbrev-friend-buffer-function' to find the
completions.

If the prefix argument is 16 (which comes from C-u C-u),
then it searches *all* buffers."
  (interactive "*P")
  (dabbrev--reset-global-variables)
  (let* ((dabbrev-check-other-buffers (and arg t))
	 (dabbrev-check-all-buffers
	  (and arg (= (prefix-numeric-value arg) 16)))
	 (abbrev (dabbrev--abbrev-at-point))
	 (ignore-case-p (and (if (eq dabbrev-case-fold-search 'case-fold-search)
				 case-fold-search
			       dabbrev-case-fold-search)
			     (or (not dabbrev-upcase-means-case-search)
				 (string= abbrev (downcase abbrev)))))
	 (my-obarray dabbrev--last-obarray)
	 init)
    (save-excursion
      ;;--------------------------------
      ;; New abbreviation to expand.
      ;;--------------------------------
      (setq dabbrev--last-abbreviation abbrev)
      ;; Find all expansion
      (let ((completion-list
	     (dabbrev--find-all-expansions abbrev ignore-case-p))
	    (completion-ignore-case ignore-case-p))
	;; Make an obarray with all expansions
	(setq my-obarray (make-vector (length completion-list) 0))
	(or (> (length my-obarray) 0)
	    (error "No dynamic expansion for \"%s\" found%s"
		   abbrev
		   (if dabbrev--check-other-buffers "" " in this-buffer")))
	(cond
	 ((or (not ignore-case-p)
	      (not dabbrev-case-replace))
	  (mapc (function (lambda (string)
			    (intern string my-obarray)))
		completion-list))
	 ((string= abbrev (upcase abbrev))
	  (mapc (function (lambda (string)
			    (intern (upcase string) my-obarray)))
		completion-list))
	 ((string= (substring abbrev 0 1)
		   (upcase (substring abbrev 0 1)))
	  (mapc (function (lambda (string)
			    (intern (capitalize string) my-obarray)))
		completion-list))
	 (t
	  (mapc (function (lambda (string)
			    (intern (downcase string) my-obarray)))
		completion-list)))
	(setq dabbrev--last-obarray my-obarray)
	(setq dabbrev--last-completion-buffer (current-buffer))
	;; Find the longest common string.
	(setq init (try-completion abbrev my-obarray))))
    ;;--------------------------------
    ;; Let the user choose between the expansions
    ;;--------------------------------
    (or (stringp init)
	(setq init abbrev))
    (cond
     ;; * Replace string fragment with matched common substring completion.
     ((and (not (string-equal init ""))
	   (not (string-equal (downcase init) (downcase abbrev))))
      (if (> (length (all-completions init my-obarray)) 1)
	  (message "Repeat `%s' to see all completions"
		   (key-description (this-command-keys)))
	(message "The only possible completion"))
      (dabbrev--substitute-expansion nil abbrev init nil))
     (t
      ;; * String is a common substring completion already.  Make list.
      (message "Making completion list...")
      (with-output-to-temp-buffer "*Completions*"
	(display-completion-list (all-completions init my-obarray)
				 init))
      (message "Making completion list...done")))
    (and (window-minibuffer-p (selected-window))
	 (message nil))))

;;;###autoload
(defun dabbrev-expand (arg)
  "Expand previous word \"dynamically\".

Expands to the most recent, preceding word for which this is a prefix.
If no suitable preceding word is found, words following point are
considered.  If still no suitable word is found, then look in the
buffers accepted by the function pointed out by variable
`dabbrev-friend-buffer-function'.

A positive prefix argument, N, says to take the Nth backward *distinct*
possibility.  A negative argument says search forward.

If the cursor has not moved from the end of the previous expansion and
no argument is given, replace the previously-made expansion
with the next possible expansion not yet tried.

The variable `dabbrev-backward-only' may be used to limit the
direction of search to backward if set non-nil.

See also `dabbrev-abbrev-char-regexp' and \\[dabbrev-completion]."
  (interactive "*P")
  (let (abbrev record-case-pattern
	       expansion old direction (orig-point (point)))
    ;; abbrev -- the abbrev to expand
    ;; expansion -- the expansion found (eventually) or nil until then
    ;; old -- the text currently in the buffer
    ;;    (the abbrev, or the previously-made expansion)
    (save-excursion
      (if (and (null arg)
	       (markerp dabbrev--last-abbrev-location)
	       (marker-position dabbrev--last-abbrev-location)
	       (or (eq last-command this-command)
		   (and (window-minibuffer-p (selected-window))
			(= dabbrev--last-abbrev-location
			   (point)))))
	  ;; Find a different expansion for the same abbrev as last time.
	  (progn
	    (setq abbrev dabbrev--last-abbreviation)
	    (setq old dabbrev--last-expansion)
	    (setq direction dabbrev--last-direction))
	;; If the user inserts a space after expanding
	;; and then asks to expand again, always fetch the next word.
	(if (and (eq (preceding-char) ?\s)
		 (markerp dabbrev--last-abbrev-location)
		 (marker-position dabbrev--last-abbrev-location)
		 (= (point) (1+ dabbrev--last-abbrev-location)))
	    (progn
	      ;; The "abbrev" to expand is just the space.
	      (setq abbrev " ")
	      (save-excursion
		(save-restriction
		  (widen)
		  (if dabbrev--last-buffer
		      (set-buffer dabbrev--last-buffer))
		  ;; Find the end of the last "expansion" word.
		  (if (or (eq dabbrev--last-direction 1)
			  (and (eq dabbrev--last-direction 0)
			       (< dabbrev--last-expansion-location (point))))
		      (setq dabbrev--last-expansion-location
			    (+ dabbrev--last-expansion-location
			       (length dabbrev--last-expansion))))
		  (goto-char dabbrev--last-expansion-location)
		  ;; Take the following word, with intermediate separators,
		  ;; as our expansion this time.
		  (re-search-forward
		   (concat "\\(?:" dabbrev--abbrev-char-regexp "\\)+"))
		  (setq expansion (buffer-substring-no-properties
				   dabbrev--last-expansion-location (point)))

		  ;; Record the end of this expansion, in case we repeat this.
		  (setq dabbrev--last-expansion-location (point))))
	      ;; Indicate that dabbrev--last-expansion-location is
	      ;; at the end of the expansion.
	      (setq dabbrev--last-direction -1))

	  ;; We have a different abbrev to expand.
	  (dabbrev--reset-global-variables)
	  (setq direction (if (null arg)
			      (if dabbrev-backward-only 1 0)
			    (prefix-numeric-value arg)))
	  (setq abbrev (dabbrev--abbrev-at-point))
	  (setq record-case-pattern t)
	  (setq old nil)))

      ;;--------------------------------
      ;; Find the expansion
      ;;--------------------------------
      (or expansion
	  (setq expansion
		(dabbrev--find-expansion abbrev direction
					 (and (if (eq dabbrev-case-fold-search 'case-fold-search)
						  case-fold-search
						dabbrev-case-fold-search)
					      (or (not dabbrev-upcase-means-case-search)
						  (string= abbrev (downcase abbrev))))))))
    (cond
     ((not expansion)
      (dabbrev--reset-global-variables)
      (if old
	  (save-excursion
	    (setq buffer-undo-list (cons orig-point buffer-undo-list))
	    ;; Put back the original abbrev with its original case pattern.
	    (search-backward old)
	    (insert abbrev)
	    (delete-region (point) (+ (point) (length old)))))
      (error "No%s dynamic expansion for `%s' found"
	     (if old " further" "") abbrev))
     (t
      (if (not (or (eq dabbrev--last-buffer dabbrev--last-buffer-found)
		   (minibuffer-window-active-p (selected-window))))
	  (progn
	    (message "Expansion found in '%s'"
		     (buffer-name dabbrev--last-buffer))
	    (setq dabbrev--last-buffer-found dabbrev--last-buffer))
	(message nil))
      (if (and (or (eq (current-buffer) dabbrev--last-buffer)
		   (null dabbrev--last-buffer))
	       (numberp dabbrev--last-expansion-location)
	       (and (> dabbrev--last-expansion-location (point))))
	  (setq dabbrev--last-expansion-location
		(copy-marker dabbrev--last-expansion-location)))
      ;; Success: stick it in and return.
      (setq buffer-undo-list (cons orig-point buffer-undo-list))
      (dabbrev--substitute-expansion old abbrev expansion
				     record-case-pattern)

      ;; Save state for re-expand.
      (setq dabbrev--last-expansion expansion)
      (setq dabbrev--last-abbreviation abbrev)
      (setq dabbrev--last-abbrev-location (point-marker))))))

;;----------------------------------------------------------------
;; Local functions
;;----------------------------------------------------------------

;;; Checks if OTHER-BUFFER has the same major mode as current buffer.
(defun dabbrev--same-major-mode-p (other-buffer)
  (eq major-mode
      (save-excursion
	(set-buffer other-buffer)
	major-mode)))

;;; Back over all abbrev type characters and then moves forward over
;;; all skip characters.
(defun dabbrev--goto-start-of-abbrev ()
  ;; Move backwards over abbrev chars
  (save-match-data
    (when (> (point) (minibuffer-prompt-end))
      (forward-char -1)
      (while (and (looking-at dabbrev--abbrev-char-regexp)
		  (> (point) (minibuffer-prompt-end))
		  (not (= (point) (field-beginning (point) nil
						   (1- (point))))))
	(forward-char -1))
      (or (looking-at dabbrev--abbrev-char-regexp)
	  (forward-char 1)))
    (and dabbrev-abbrev-skip-leading-regexp
	 (while (looking-at dabbrev-abbrev-skip-leading-regexp)
	   (forward-char 1)))))

;;; Extract the symbol at point to serve as abbreviation.
(defun dabbrev--abbrev-at-point ()
  ;; Check for error
  (if (bobp)
      (error "No possible abbreviation preceding point"))
  ;; Return abbrev at point
  (save-excursion
    ;; Record the end of the abbreviation.
    (setq dabbrev--last-abbrev-location (point))
    ;; If we aren't right after an abbreviation,
    ;; move point back to just after one.
    ;; This is so the user can get successive words
    ;; by typing the punctuation followed by M-/.
    (save-match-data
      (if (save-excursion
	    (forward-char -1)
	    (not (looking-at (concat "\\("
				     (or dabbrev-abbrev-char-regexp
					 "\\sw\\|\\s_")
				     "\\)+"))))
	  (if (re-search-backward (or dabbrev-abbrev-char-regexp
				      "\\sw\\|\\s_")
				  nil t)
	      (forward-char 1)
	    (error "No possible abbreviation preceding point"))))
    ;; Now find the beginning of that one.
    (dabbrev--goto-start-of-abbrev)
    (buffer-substring-no-properties
     dabbrev--last-abbrev-location (point))))

;;; Initializes all global variables
(defun dabbrev--reset-global-variables ()
  ;; dabbrev--last-obarray and dabbrev--last-completion-buffer
  ;; must not be reset here.
  (setq dabbrev--last-table nil
	dabbrev--last-abbreviation nil
	dabbrev--last-abbrev-location nil
	dabbrev--last-direction nil
	dabbrev--last-expansion nil
	dabbrev--last-expansion-location nil
	dabbrev--friend-buffer-list nil
	dabbrev--last-buffer nil
	dabbrev--last-buffer-found nil
	dabbrev--abbrev-char-regexp (or dabbrev-abbrev-char-regexp
					"\\sw\\|\\s_")
	dabbrev--check-other-buffers dabbrev-check-other-buffers))

(defun dabbrev--select-buffers ()
  "Return a list of other buffers to search for a possible abbrev.
The current buffer is not included in the list.

This function makes a list of all the buffers returned by `buffer-list',
then discards buffers whose names match `dabbrev-ignored-buffer-names'
or `dabbrev-ignored-buffer-regexps'.  It also discards buffers for which
`dabbrev-friend-buffer-function', if it is bound, returns nil when called
with the buffer as argument.
It returns the list of the buffers that are not discarded."
  (dabbrev-filter-elements
   buffer (buffer-list)
   (and (not (eq (current-buffer) buffer))
	(not (dabbrev--ignore-buffer-p buffer))
	(boundp 'dabbrev-friend-buffer-function)
	(funcall dabbrev-friend-buffer-function buffer))))

(defun dabbrev--try-find (abbrev reverse n ignore-case)
  "Search for ABBREV, backwards if REVERSE, N times.
If IGNORE-CASE is non-nil, ignore case while searching.
Return the expansion found, and save the location of the start
of the expansion in `dabbrev--last-expansion-location'."
  (save-excursion
    (save-restriction
      (widen)
      (let ((expansion nil))
	(and dabbrev--last-expansion-location
	     (goto-char dabbrev--last-expansion-location))
	(let ((case-fold-search ignore-case)
	      (count n))
	  (while (and (> count 0)
		      (setq expansion (dabbrev--search abbrev
						       reverse
						       (and ignore-case
							    (if (eq dabbrev-case-distinction 'case-replace)
								case-replace
							      dabbrev-case-distinction))
						       )))
	    (setq count (1- count))))
	(and expansion
	     (setq dabbrev--last-expansion-location (point)))
	expansion))))

(defun dabbrev--find-all-expansions (abbrev ignore-case)
  "Return a list of all possible expansions of ABBREV.
If IGNORE-CASE is non-nil, accept matches which differ in case."
  (let ((all-expansions nil)
	expansion)
    (save-excursion
      (goto-char (point-min))
      (while (setq expansion (dabbrev--find-expansion abbrev -1 ignore-case))
	(setq all-expansions (cons expansion all-expansions))))
    all-expansions))

(defun dabbrev--ignore-buffer-p (buffer)
  "Return non-nil if BUFFER should be ignored by dabbrev."
  (let ((bn (buffer-name buffer)))
    (or (member bn dabbrev-ignored-buffer-names)
	(let ((tail dabbrev-ignored-buffer-regexps)
	      (match nil))
	  (while (and tail (not match))
	    (setq match (string-match (car tail) bn)
		  tail (cdr tail)))
	  match))))

(defun dabbrev--find-expansion (abbrev direction ignore-case)
  "Find one occurrence of ABBREV, and return the expansion.
DIRECTION > 0 means look that many times backwards.
DIRECTION < 0 means look that many times forward.
DIRECTION = 0 means try both backward and forward.
IGNORE-CASE non-nil means ignore case when searching.
This sets `dabbrev--last-direction' to 1 or -1 according
to the direction in which the occurrence was actually found.
It sets `dabbrev--last-expansion-location' to the location
of the start of the occurrence."
  (save-excursion
    ;; If we were scanning something other than the current buffer,
    ;; continue scanning there.
    (when dabbrev--last-buffer
      (set-buffer dabbrev--last-buffer))
    (or
     ;; ------------------------------------------
     ;; Look backward in current buffer.
     ;; ------------------------------------------
     (and (not dabbrev-search-these-buffers-only)
	  (>= direction 0)
	  (setq dabbrev--last-direction (min 1 direction))
	  (dabbrev--try-find abbrev t
			     (max 1 direction)
			     ignore-case))
     ;; ------------------------------------------
     ;; Look forward in current buffer
     ;; or whatever buffer we were last scanning.
     ;; ------------------------------------------
     (and (or (not dabbrev-search-these-buffers-only)
	      dabbrev--last-buffer)
	  (<= direction 0)
	  (setq dabbrev--last-direction -1)
	  (dabbrev--try-find abbrev nil
			     (max 1 (- direction))
			     ignore-case))
     ;; ------------------------------------------
     ;; Look in other buffers.
     ;; Always start at (point-min) and look forward.
     ;; ------------------------------------------
     (progn
       (setq dabbrev--last-direction -1)
       (unless dabbrev--last-buffer
	 ;; If we have just now begun to search other buffers,
	 ;; determine which other buffers we should check.
	 ;; Put that list in dabbrev--friend-buffer-list.
	 (unless dabbrev--friend-buffer-list
           (setq dabbrev--friend-buffer-list
                 (dabbrev--make-friend-buffer-list))
           (setq dabbrev--progress-reporter
                 (make-progress-reporter
                  "Scanning for dabbrevs..."
                  (- (length dabbrev--friend-buffer-list)) 0 0 1 1.5))))
       ;; Walk through the buffers till we find a match.
       (let (expansion)
	 (while (and (not expansion) dabbrev--friend-buffer-list)
	   (setq dabbrev--last-buffer (pop dabbrev--friend-buffer-list))
	   (set-buffer dabbrev--last-buffer)
           (progress-reporter-update dabbrev--progress-reporter
                                     (- (length dabbrev--friend-buffer-list)))
	   (setq dabbrev--last-expansion-location (point-min))
	   (setq expansion (dabbrev--try-find abbrev nil 1 ignore-case)))
	 expansion)))))

;; Compute the list of buffers to scan.
;; If dabbrev-search-these-buffers-only, then the current buffer
;; is included in this list if it should be searched.
;; Otherwise, the current buffer is searched first specially.,
;; and it is not included in this list.
(defun dabbrev--make-friend-buffer-list ()
  (let ((list (mapcar (function get-buffer)
		      dabbrev-search-these-buffers-only)))
    (when (and (null dabbrev-search-these-buffers-only)
	       dabbrev--check-other-buffers
	       (or (eq dabbrev--check-other-buffers t)
		   (setq dabbrev--check-other-buffers
			 (y-or-n-p "Scan other buffers also? "))))
      (setq list (funcall dabbrev-select-buffers-function))
      ;; If dabbrev-check-all-buffers, tack on all the other
      ;; buffers at the end of the list, except those which are
      ;; specifically to be ignored.
      (if dabbrev-check-all-buffers
	  (setq list
		(append list
			(dabbrev-filter-elements
			 buffer (buffer-list)
			 (and (not (memq buffer list))
			      (not (dabbrev--ignore-buffer-p buffer)))))))
      ;; Remove the current buffer.
      (setq list (delq (current-buffer) list)))
    ;; Move buffers in the list that are visible on the screen
    ;; to the front of the list, but don't add anything to the list.
    (if list
	(walk-windows (lambda (w)
			(unless (eq w (selected-window))
			  (if (memq (window-buffer w) list)
			      (setq list
				    (cons (window-buffer w)
					  (delq (window-buffer w)
						list))))))))
    ;; In a minibuffer, search the buffer it was activated from,
    ;; first after the minibuffer itself.  Unless we aren't supposed
    ;; to search the current buffer either.
    (if (and (window-minibuffer-p (selected-window))
	     (not dabbrev-search-these-buffers-only))
	(setq list
	      (cons (dabbrev--minibuffer-origin)
		    (delq (dabbrev--minibuffer-origin) list))))
    list))

(defun dabbrev--safe-replace-match (string &optional fixedcase literal)
  (if (eq major-mode 'picture-mode)
      (with-no-warnings
       (picture-replace-match string fixedcase literal))
    (replace-match string fixedcase literal)))

;;;----------------------------------------------------------------
(defun dabbrev--substitute-expansion (old abbrev expansion record-case-pattern)
  "Replace OLD with EXPANSION in the buffer.
OLD is text currently in the buffer, perhaps the abbreviation
or perhaps another expansion that was tried previously.
ABBREV is the abbreviation we are expanding.
It is \" \" if we are copying subsequent words.
EXPANSION is the expansion substring to be used this time.
RECORD-CASE-PATTERN, if non-nil, means set `dabbrev--last-case-pattern'
to record whether we upcased the expansion, downcased it, or did neither."
  ;;(undo-boundary)
  (let ((use-case-replace (and (if (eq dabbrev-case-fold-search 'case-fold-search)
				   case-fold-search
				 dabbrev-case-fold-search)
			       (or (not dabbrev-upcase-means-case-search)
				   (string= abbrev (downcase abbrev)))
			       (if (eq dabbrev-case-replace 'case-replace)
				   case-replace
				 dabbrev-case-replace))))

    ;; If we upcased or downcased the original expansion,
    ;; do likewise for the subsequent words when we copy them.
    ;; Don't do any of the usual case processing, though.
    (when (equal abbrev " ")
      (if dabbrev--last-case-pattern
	  (setq expansion
		(funcall dabbrev--last-case-pattern expansion)))
      (setq use-case-replace nil))

    ;; If the expansion has mixed case
    ;; and it is not simply a capitalized word,
    ;; or if the abbrev has mixed case,
    ;; and if the given abbrev's case pattern
    ;; matches the start of the expansion,
    ;; copy the expansion's case
    ;; instead of downcasing all the rest.
    ;;
    ;; Treat a one-capital-letter (possibly with preceding non-letter
    ;; characters) abbrev as "not all upper case", so as to force
    ;; preservation of the expansion's pattern if the expansion starts
    ;; with a capital letter.
    (let ((expansion-rest (substring expansion 1))
	  (first-letter-position (string-match "[[:alpha:]]" abbrev)))
      (if (or (null first-letter-position)
	      (and (not (and (or (string= expansion-rest (downcase expansion-rest))
				 (string= expansion-rest (upcase expansion-rest)))
			     (or (string= abbrev (downcase abbrev))
				 (and (string= abbrev (upcase abbrev))
				      (> (- (length abbrev) first-letter-position)
					 1)))))
		   (string= abbrev
			    (substring expansion 0 (length abbrev)))))
	  (setq use-case-replace nil)))

    ;; If the abbrev and the expansion are both all-lower-case
    ;; then don't do any conversion.  The conversion would be a no-op
    ;; for this replacement, but it would carry forward to subsequent words.
    ;; The goal of this is to prevent that carrying forward.
    (if (and (string= expansion (downcase expansion))
	     (string= abbrev (downcase abbrev)))
	(setq use-case-replace nil))

    (if use-case-replace
	(setq expansion (downcase expansion)))

    ;; In case we insert subsequent words,
    ;; record if we upcased or downcased the first word,
    ;; in order to do likewise for subsequent words.
    (and record-case-pattern
	 (setq dabbrev--last-case-pattern
	       (and use-case-replace
		    (cond ((equal abbrev (upcase abbrev)) 'upcase)
			  ((equal abbrev (downcase abbrev)) 'downcase)))))

    ;; Convert whitespace to single spaces.
    (if dabbrev-eliminate-newlines
	(let ((pos
	       (if (equal abbrev " ") 0 (length abbrev))))
	  ;; If ABBREV is real, search after the end of it.
	  ;; If ABBREV is space and we are copying successive words,
	  ;; search starting at the front.
	  (while (string-match "[\n \t]+" expansion pos)
	    (setq pos (1+ (match-beginning 0)))
	    (setq expansion (replace-match " " nil nil expansion)))))

    (if old
	(save-excursion
	  (search-backward old))
      ;;(set-match-data (list (point-marker) (point-marker)))
      (search-backward abbrev)
      (search-forward abbrev))

    ;; Make case of replacement conform to case of abbreviation
    ;; provided (1) that kind of thing is enabled in this buffer
    ;; and (2) the replacement itself is all lower case.
    (dabbrev--safe-replace-match expansion
				 (not use-case-replace)
				 t)))


;;;----------------------------------------------------------------
;;; Search function used by dabbrevs library.


(defun dabbrev--search (abbrev reverse ignore-case)
  "Search for something that could be used to expand ABBREV.

Second arg, REVERSE, is t for reverse search, nil for forward.
The variable `dabbrev-limit' controls the maximum search region size.
Third argument IGNORE-CASE non-nil means treat case as insignificant while
looking for a match and when comparing with previous matches.  Also if
that's non-nil and the match is found at the beginning of a sentence
and is in lower case except for the initial then it is converted to
all lower case for return.

Table of expansions already seen is examined in buffer
`dabbrev--last-table' so that only distinct possibilities are found
by dabbrev-re-expand.

Returns the expansion found, or nil if not found.
Leaves point at the location of the start of the expansion."
  (save-match-data
    (let ((pattern1 (concat (regexp-quote abbrev)
			    "\\(" dabbrev--abbrev-char-regexp "\\)"))
	  (pattern2 (concat (regexp-quote abbrev)
			   "\\(\\(" dabbrev--abbrev-char-regexp "\\)+\\)"))
	  ;; This makes it possible to find matches in minibuffer prompts
	  ;; even when they are "inviolable".
	  (inhibit-point-motion-hooks t)
	  found-string result)
      ;; Limited search.
      (save-restriction
	(and dabbrev-limit
	     (narrow-to-region dabbrev--last-expansion-location
			       (+ (point)
				  (if reverse (- dabbrev-limit) dabbrev-limit))))
	;;--------------------------------
	;; Look for a distinct expansion, using dabbrev--last-table.
	;;--------------------------------
	(while (and (not found-string)
		    (if reverse
			(re-search-backward pattern1 nil t)
		      (re-search-forward pattern1 nil t)))
	  (goto-char (match-beginning 0))
	  ;; In case we matched in the middle of a word,
	  ;; back up to start of word and verify we still match.
	  (dabbrev--goto-start-of-abbrev)

	  (if (not (looking-at pattern1))
	      nil
	    ;; We have a truly valid match.  Find the end.
	    (re-search-forward pattern2)
	    (setq found-string (match-string-no-properties 0))
	    (setq result found-string)
	    (and ignore-case (setq found-string (downcase found-string)))
	    ;; Ignore this match if it's already in the table.
	    (if (dabbrev-filter-elements
		 table-string dabbrev--last-table
		 (string= found-string table-string))
		(setq found-string nil)))
	  ;; Prepare to continue searching.
	  (goto-char (if reverse (match-beginning 0) (match-end 0))))
	;; If we found something, use it.
	(when found-string
	  ;; Put it into `dabbrev--last-table'
	  ;; and return it (either downcased, or as is).
	  (setq dabbrev--last-table
		(cons found-string dabbrev--last-table))
	  result)))))

(dolist (mess '("^No dynamic expansion for .* found$"
		"^No further dynamic expansion for .* found$"
		"^No possible abbreviation preceding point$"))
  (add-to-list 'debug-ignored-errors mess))

(provide 'dabbrev)

;;; arch-tag: 29e58596-f080-4306-a409-70296cf9d46f
;;; dabbrev.el ends here