minibuffer.el 104 KB
Newer Older
1 2
;;; minibuffer.el --- Minibuffer completion functions

Glenn Morris's avatar
Glenn Morris committed
3
;; Copyright (C) 2008, 2009, 2010  Free Software Foundation, Inc.
4 5 6 7 8

;; Author: Stefan Monnier <monnier@iro.umontreal.ca>

;; This file is part of GNU Emacs.

9
;; GNU Emacs is free software: you can redistribute it and/or modify
10 11 12 13
;; 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.

14
;; GNU Emacs is distributed in the hope that it will be useful,
15 16 17 18 19
;; 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
20
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
21 22 23

;;; Commentary:

24 25 26 27 28
;; Names with "--" are for functions and variables that are meant to be for
;; internal use only.

;; Functional completion tables have an extended calling conventions:
;; - The `action' can be (additionally to nil, t, and lambda) of the form
29 30
;;   (boundaries . SUFFIX) in which case it should return
;;   (boundaries START . END).  See `completion-boundaries'.
31 32 33 34 35
;;   Any other return value should be ignored (so we ignore values returned
;;   from completion tables that don't know about this new `action' form).

;;; Bugs:

36 37 38
;; - completion-all-sorted-completions list all the completions, whereas
;;   it should only lists the ones that `try-completion' would consider.
;;   E.g.  it should honor completion-ignored-extensions.
39
;; - choose-completion can't automatically figure out the boundaries
40 41 42
;;   corresponding to the displayed completions because we only
;;   provide the start info but not the end info in
;;   completion-base-position.
43 44 45
;; - quoting is problematic.  E.g. the double-dollar quoting used in
;;   substitie-in-file-name (and hence read-file-name-internal) bumps
;;   into various bugs:
46 47 48
;; - choose-completion doesn't know how to quote the text it inserts.
;;   E.g. it fails to double the dollars in file-name completion, or
;;   to backslash-escape spaces and other chars in comint completion.
49 50 51 52 53
;;   - when completing ~/tmp/fo$$o, the highligting in *Completions*
;;     is off by one position.
;;   - all code like PCM which relies on all-completions to match
;;     its argument gets confused because all-completions returns unquoted
;;     texts (as desired for *Completions* output).
54 55 56
;; - C-x C-f ~/*/sr ? should not list "~/./src".
;; - minibuffer-force-complete completes ~/src/emacs/t<!>/lisp/minibuffer.el
;;   to ~/src/emacs/trunk/ and throws away lisp/minibuffer.el.
57

58 59
;;; Todo:

60 61
;; - extend `boundaries' to provide various other meta-data about the
;;   output of `all-completions':
62 63
;;   - preferred sorting order when displayed in *Completions*.
;;   - annotations/text-properties to add when displayed in *Completions*.
64 65 66 67 68 69 70 71 72 73 74 75 76 77 78
;;   - quoting/unquoting (so we can complete files names with envvars
;;     and backslashes, and all-completion can list names without
;;     quoting backslashes and dollars).
;;   - indicate how to turn all-completion's output into
;;     try-completion's output: e.g. completion-ignored-extensions.
;;     maybe that could be merged with the "quote" operation above.
;;   - completion hook to run when the completion is
;;     selected/inserted (maybe this should be provided some other
;;     way, e.g. as text-property, so `try-completion can also return it?)
;;     both for when it's inserted via TAB or via choose-completion.
;;   - indicate that `all-completions' doesn't do prefix-completion
;;     but just returns some list that relates in some other way to
;;     the provided string (as is the case in filecache.el), in which
;;     case partial-completion (for example) doesn't make any sense
;;     and neither does the completions-first-difference highlight.
79 80 81
;;   - indicate how to display the completions in *Completions* (turn
;;     \n into something else, add special boundaries between
;;     completions).  E.g. when completing from the kill-ring.
82 83

;; - make partial-completion-mode obsolete:
84
;;   - (?) <foo.h> style completion for file names.
85 86 87 88 89 90 91 92 93 94 95
;;     This can't be done identically just by tweaking completion,
;;     because partial-completion-mode's behavior is to expand <string.h>
;;     to /usr/include/string.h only when exiting the minibuffer, at which
;;     point the completion code is actually not involved normally.
;;     Partial-completion-mode does it via a find-file-not-found-function.
;;   - special code for C-x C-f <> to visit the file ref'd at point
;;     via (require 'foo) or #include "foo".  ffap seems like a better
;;     place for this feature (supplemented with major-mode-provided
;;     functions to find the file ref'd at point).

;; - case-sensitivity currently confuses two issues:
96
;;   - whether or not a particular completion table should be case-sensitive
97
;;     (i.e. whether strings that differ only by case are semantically
98 99 100 101 102
;;     equivalent)
;;   - whether the user wants completion to pay attention to case.
;;   e.g. we may want to make it possible for the user to say "first try
;;   completion case-sensitively, and if that fails, try to ignore case".

103
;; - add support for ** to pcm.
104 105
;; - Add vc-file-name-completion-table to read-file-name-internal.
;; - A feature like completing-help.el.
106 107 108 109 110

;;; Code:

(eval-when-compile (require 'cl))

111 112
;;; Completion table manipulation

113
;; New completion-table operation.
114 115
(defun completion-boundaries (string table pred suffix)
  "Return the boundaries of the completions returned by TABLE for STRING.
116
STRING is the string on which completion will be performed.
117 118 119 120 121 122
SUFFIX is the string after point.
The result is of the form (START . END) where START is the position
in STRING of the beginning of the completion field and END is the position
in SUFFIX of the end of the completion field.
E.g. for simple completion tables, the result is always (0 . (length SUFFIX))
and for file names the result is the positions delimited by
123 124
the closest directory separators."
  (let ((boundaries (if (functionp table)
125
                        (funcall table string pred (cons 'boundaries suffix)))))
126 127 128
    (if (not (eq (car-safe boundaries) 'boundaries))
        (setq boundaries nil))
    (cons (or (cadr boundaries) 0)
129
          (or (cddr boundaries) (length suffix)))))
130

131 132 133 134
(defun completion--some (fun xs)
  "Apply FUN to each element of XS in turn.
Return the first non-nil returned value.
Like CL's `some'."
135 136
  (let ((firsterror nil)
        res)
137
    (while (and (not res) xs)
138 139 140 141 142
      (condition-case err
          (setq res (funcall fun (pop xs)))
        (error (unless firsterror (setq firsterror err)) nil)))
    (or res
        (if firsterror (signal (car firsterror) (cdr firsterror))))))
143

144 145 146 147 148 149
(defun complete-with-action (action table string pred)
  "Perform completion ACTION.
STRING is the string to complete.
TABLE is the completion table, which should not be a function.
PRED is a completion predicate.
ACTION can be one of nil, t or `lambda'."
150 151 152 153 154 155 156 157 158 159 160
  (cond
   ((functionp table) (funcall table string pred action))
   ((eq (car-safe action) 'boundaries)
    (cons 'boundaries (completion-boundaries string table pred (cdr action))))
   (t
    (funcall
     (cond
      ((null action) 'try-completion)
      ((eq action t) 'all-completions)
      (t 'test-completion))
     string table pred))))
161 162 163 164

(defun completion-table-dynamic (fun)
  "Use function FUN as a dynamic completion table.
FUN is called with one argument, the string for which completion is required,
165 166 167 168
and it should return an alist containing all the intended possible completions.
This alist may be a full list of possible completions so that FUN can ignore
the value of its argument.  If completion is performed in the minibuffer,
FUN will be called in the buffer from which the minibuffer was entered.
169

170
The result of the `completion-table-dynamic' form is a function
171
that can be used as the COLLECTION argument to `try-completion' and
172
`all-completions'.  See Info node `(elisp)Programmed Completion'."
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189
  (lexical-let ((fun fun))
    (lambda (string pred action)
      (with-current-buffer (let ((win (minibuffer-selected-window)))
                             (if (window-live-p win) (window-buffer win)
                               (current-buffer)))
        (complete-with-action action (funcall fun string) string pred)))))

(defmacro lazy-completion-table (var fun)
  "Initialize variable VAR as a lazy completion table.
If the completion table VAR is used for the first time (e.g., by passing VAR
as an argument to `try-completion'), the function FUN is called with no
arguments.  FUN must return the completion table that will be stored in VAR.
If completion is requested in the minibuffer, FUN will be called in the buffer
from which the minibuffer was entered.  The return value of
`lazy-completion-table' must be used to initialize the value of VAR.

You should give VAR a non-nil `risky-local-variable' property."
190
  (declare (debug (symbolp lambda-expr)))
191 192 193 194 195 196 197 198
  (let ((str (make-symbol "string")))
    `(completion-table-dynamic
      (lambda (,str)
        (when (functionp ,var)
          (setq ,var (,fun)))
        ,var))))

(defun completion-table-with-context (prefix table string pred action)
199
  ;; TODO: add `suffix' maybe?
200
  ;; Notice that `pred' may not be a function in some abusive cases.
201 202 203 204 205 206 207 208 209 210 211 212 213 214 215
  (when (functionp pred)
    (setq pred
          (lexical-let ((pred pred))
            ;; Predicates are called differently depending on the nature of
            ;; the completion table :-(
            (cond
             ((vectorp table)           ;Obarray.
              (lambda (sym) (funcall pred (concat prefix (symbol-name sym)))))
             ((hash-table-p table)
              (lambda (s v) (funcall pred (concat prefix s))))
             ((functionp table)
              (lambda (s) (funcall pred (concat prefix s))))
             (t                         ;Lists and alists.
              (lambda (s)
                (funcall pred (concat prefix (if (consp s) (car s) s)))))))))
216 217
  (if (eq (car-safe action) 'boundaries)
      (let* ((len (length prefix))
218 219
             (bound (completion-boundaries string table pred (cdr action))))
        (list* 'boundaries (+ (car bound) len) (cdr bound)))
220 221 222 223 224
    (let ((comp (complete-with-action action table string pred)))
      (cond
       ;; In case of try-completion, add the prefix.
       ((stringp comp) (concat prefix comp))
       (t comp)))))
225 226

(defun completion-table-with-terminator (terminator table string pred action)
227 228 229 230 231
  "Construct a completion table like TABLE but with an extra TERMINATOR.
This is meant to be called in a curried way by first passing TERMINATOR
and TABLE only (via `apply-partially').
TABLE is a completion table, and TERMINATOR is a string appended to TABLE's
completion if it is complete.  TERMINATOR is also used to determine the
232 233 234 235 236 237
completion suffix's boundary.
TERMINATOR can also be a cons cell (TERMINATOR . TERMINATOR-REGEXP)
in which case TERMINATOR-REGEXP is a regular expression whose submatch
number 1 should match TERMINATOR.  This is used when there is a need to
distinguish occurrences of the TERMINATOR strings which are really terminators
from others (e.g. escaped)."
238
  (cond
239 240 241
   ((eq (car-safe action) 'boundaries)
    (let* ((suffix (cdr action))
           (bounds (completion-boundaries string table pred suffix))
242 243 244
           (terminator-regexp (if (consp terminator)
                                  (cdr terminator) (regexp-quote terminator)))
           (max (string-match terminator-regexp suffix)))
245 246
      (list* 'boundaries (car bounds)
             (min (cdr bounds) (or max (length suffix))))))
247 248
   ((eq action nil)
    (let ((comp (try-completion string table pred)))
249
      (if (consp terminator) (setq terminator (car terminator)))
250 251 252
      (if (eq comp t)
          (concat string terminator)
        (if (and (stringp comp)
253 254 255 256 257
                 ;; FIXME: Try to avoid this second call, especially since
                 ;; it may be very inefficient (because `comp' made us
                 ;; jump to a new boundary, so we complete in that
                 ;; boundary with an empty start string).
                 ;; completion-boundaries might help.
258
                 (eq (try-completion comp table pred) t))
259
            (concat comp terminator)
260
          comp))))
261 262 263 264 265
   ((eq action t)
    ;; FIXME: We generally want the `try' and `all' behaviors to be
    ;; consistent so pcm can merge the `all' output to get the `try' output,
    ;; but that sometimes clashes with the need for `all' output to look
    ;; good in *Completions*.
266 267
    ;; (mapcar (lambda (s) (concat s terminator))
    ;;         (all-completions string table pred))))
268
    (all-completions string table pred))
269 270 271 272 273 274 275
   ;; completion-table-with-terminator is always used for
   ;; "sub-completions" so it's only called if the terminator is missing,
   ;; in which case `test-completion' should return nil.
   ((eq action 'lambda) nil)))

(defun completion-table-with-predicate (table pred1 strict string pred2 action)
  "Make a completion table equivalent to TABLE but filtered through PRED1.
276
PRED1 is a function of one argument which returns non-nil if and only if the
277 278 279
argument is an element of TABLE which should be considered for completion.
STRING, PRED2, and ACTION are the usual arguments to completion tables,
as described in `try-completion', `all-completions', and `test-completion'.
280 281
If STRICT is t, the predicate always applies; if nil it only applies if
it does not reduce the set of possible completions to nothing.
282 283 284 285
Note: TABLE needs to be a proper completion table which obeys predicates."
  (cond
   ((and (not strict) (eq action 'lambda))
    ;; Ignore pred1 since it doesn't really have to apply anyway.
286
    (test-completion string table pred2))
287 288 289 290 291 292 293 294 295 296 297 298
   (t
    (or (complete-with-action action table string
                              (if (null pred2) pred1
                                (lexical-let ((pred1 pred2) (pred2 pred2))
                                  (lambda (x)
                                    ;; Call `pred1' first, so that `pred2'
                                    ;; really can't tell that `x' is in table.
                                    (if (funcall pred1 x) (funcall pred2 x))))))
        ;; If completion failed and we're not applying pred1 strictly, try
        ;; again without pred1.
        (and (not strict)
             (complete-with-action action table string pred2))))))
299

300 301
(defun completion-table-in-turn (&rest tables)
  "Create a completion table that tries each table in TABLES in turn."
302 303
  ;; FIXME: the boundaries may come from TABLE1 even when the completion list
  ;; is returned by TABLE2 (because TABLE1 returned an empty list).
304
  (lexical-let ((tables tables))
305
    (lambda (string pred action)
306 307 308 309
      (completion--some (lambda (table)
                          (complete-with-action action table string pred))
                        tables))))

310 311
;; (defmacro complete-in-turn (a b) `(completion-table-in-turn ,a ,b))
;; (defmacro dynamic-completion-table (fun) `(completion-table-dynamic ,fun))
312 313
(define-obsolete-function-alias
  'complete-in-turn 'completion-table-in-turn "23.1")
314 315
(define-obsolete-function-alias
  'dynamic-completion-table 'completion-table-dynamic "23.1")
316 317 318

;;; Minibuffer completion

319 320 321 322 323
(defgroup minibuffer nil
  "Controlling the behavior of the minibuffer."
  :link '(custom-manual "(emacs)Minibuffer")
  :group 'environment)

324 325 326 327 328 329
(defun minibuffer-message (message &rest args)
  "Temporarily display MESSAGE at the end of the minibuffer.
The text is displayed for `minibuffer-message-timeout' seconds,
or until the next input event arrives, whichever comes first.
Enclose MESSAGE in [...] if this is not yet the case.
If ARGS are provided, then pass MESSAGE through `format'."
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
  (if (not (minibufferp (current-buffer)))
      (progn
        (if args
            (apply 'message message args)
          (message "%s" message))
        (prog1 (sit-for (or minibuffer-message-timeout 1000000))
          (message nil)))
    ;; Clear out any old echo-area message to make way for our new thing.
    (message nil)
    (setq message (if (and (null args) (string-match-p "\\` *\\[.+\\]\\'" message))
                      ;; Make sure we can put-text-property.
                      (copy-sequence message)
                    (concat " [" message "]")))
    (when args (setq message (apply 'format message args)))
    (let ((ol (make-overlay (point-max) (point-max) nil t t))
          ;; A quit during sit-for normally only interrupts the sit-for,
          ;; but since minibuffer-message is used at the end of a command,
          ;; at a time when the command has virtually finished already, a C-g
          ;; should really cause an abort-recursive-edit instead (i.e. as if
          ;; the C-g had been typed at top-level).  Binding inhibit-quit here
          ;; is an attempt to get that behavior.
          (inhibit-quit t))
      (unwind-protect
          (progn
            (unless (zerop (length message))
              ;; 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 message))
            (overlay-put ol 'after-string message)
            (sit-for (or minibuffer-message-timeout 1000000)))
        (delete-overlay ol)))))
362 363 364 365 366 367 368 369 370

(defun minibuffer-completion-contents ()
  "Return the user input in a minibuffer before point as a string.
That is what completion commands operate on."
  (buffer-substring (field-beginning) (point)))

(defun delete-minibuffer-contents ()
  "Delete all user input in a minibuffer.
If the current buffer is not a minibuffer, erase its entire contents."
371 372 373
  ;; We used to do `delete-field' here, but when file name shadowing
  ;; is on, the field doesn't cover the entire minibuffer contents.
  (delete-region (minibuffer-prompt-end) (point-max)))
374

375 376 377 378 379 380
(defcustom completion-auto-help t
  "Non-nil means automatically provide help for invalid completion input.
If the value is t the *Completion* buffer is displayed whenever completion
is requested but cannot be done.
If the value is `lazy', the *Completions* buffer is only displayed after
the second failed attempt to complete."
381
  :type '(choice (const nil) (const t) (const lazy))
382 383
  :group 'minibuffer)

384
(defconst completion-styles-alist
385 386
  '((emacs21
     completion-emacs21-try-completion completion-emacs21-all-completions
387 388 389 390
     "Simple prefix-based completion.
I.e. when completing \"foo_bar\" (where _ is the position of point),
it will consider all completions candidates matching the glob
pattern \"foobar*\".")
391 392
    (emacs22
     completion-emacs22-try-completion completion-emacs22-all-completions
393 394 395 396
     "Prefix completion that only operates on the text before point.
I.e. when completing \"foo_bar\" (where _ is the position of point),
it will consider all completions candidates matching the glob
pattern \"foo*\" and will add back \"bar\" to the end of it.")
397 398
    (basic
     completion-basic-try-completion completion-basic-all-completions
399 400 401 402
     "Completion of the prefix before point and the suffix after point.
I.e. when completing \"foo_bar\" (where _ is the position of point),
it will consider all completions candidates matching the glob
pattern \"foo*bar*\".")
403
    (partial-completion
404 405
     completion-pcm-try-completion completion-pcm-all-completions
     "Completion of multiple words, each one taken as a prefix.
406 407 408 409 410 411 412
I.e. when completing \"l-co_h\" (where _ is the position of point),
it will consider all completions candidates matching the glob
pattern \"l*-co*h*\".
Furthermore, for completions that are done step by step in subfields,
the method is applied to all the preceding fields that do not yet match.
E.g. C-x C-f /u/mo/s TAB could complete to /usr/monnier/src.
Additionally the user can use the char \"*\" as a glob pattern.")
413 414 415 416 417 418
    (substring
     completion-substring-try-completion completion-substring-all-completions
     "Completion of the string taken as a substring.
I.e. when completing \"foo_bar\" (where _ is the position of point),
it will consider all completions candidates matching the glob
pattern \"*foo*bar*\".")
419 420 421 422 423
    (initials
     completion-initials-try-completion completion-initials-all-completions
     "Completion of acronyms and initialisms.
E.g. can complete M-x lch to list-command-history
and C-x C-f ~/sew to ~/src/emacs/work."))
424
  "List of available completion styles.
425
Each element has the form (NAME TRY-COMPLETION ALL-COMPLETIONS DOC):
426
where NAME is the name that should be used in `completion-styles',
427 428 429 430 431
TRY-COMPLETION is the function that does the completion (it should
follow the same calling convention as `completion-try-completion'),
ALL-COMPLETIONS is the function that lists the completions (it should
follow the calling convention of `completion-all-completions'),
and DOC describes the way this style of completion works.")
432

433 434 435 436 437 438 439 440 441 442 443 444 445
(defcustom completion-styles
  ;; First, use `basic' because prefix completion has been the standard
  ;; for "ever" and works well in most cases, so using it first
  ;; ensures that we obey previous behavior in most cases.
  '(basic
    ;; Then use `partial-completion' because it has proven to
    ;; be a very convenient extension.
    partial-completion
    ;; Finally use `emacs22' so as to maintain (in many/most cases)
    ;; the previous behavior that when completing "foobar" with point
    ;; between "foo" and "bar" the completion try to complete "foo"
    ;; and simply add "bar" to the end of the result.
    emacs22)
446 447
  "List of completion styles to use.
The available styles are listed in `completion-styles-alist'."
448 449 450 451 452
  :type `(repeat (choice ,@(mapcar (lambda (x) (list 'const (car x)))
                                   completion-styles-alist)))
  :group 'minibuffer
  :version "23.1")

453 454 455 456 457 458 459 460
(defun completion-try-completion (string table pred point)
  "Try to complete STRING using completion table TABLE.
Only the elements of table that satisfy predicate PRED are considered.
POINT is the position of point within STRING.
The return value can be either nil to indicate that there is no completion,
t to indicate that STRING is the only possible completion,
or a pair (STRING . NEWPOINT) of the completed result string together with
a new position for point."
461 462 463 464
  (completion--some (lambda (style)
                      (funcall (nth 1 (assq style completion-styles-alist))
                               string table pred point))
                    completion-styles))
465

466 467 468 469
(defun completion-all-completions (string table pred point)
  "List the possible completions of STRING in completion table TABLE.
Only the elements of table that satisfy predicate PRED are considered.
POINT is the position of point within STRING.
470
The return value is a list of completions and may contain the base-size
471
in the last `cdr'."
472 473
  ;; FIXME: We need to additionally return the info needed for the
  ;; second part of completion-base-position.
474 475 476 477
  (completion--some (lambda (style)
                      (funcall (nth 2 (assq style completion-styles-alist))
                               string table pred point))
                    completion-styles))
478

479 480 481 482 483
(defun minibuffer--bitset (modified completions exact)
  (logior (if modified    4 0)
          (if completions 2 0)
          (if exact       1 0)))

484 485 486 487 488 489 490 491 492 493 494
(defun completion--replace (beg end newtext)
  "Replace the buffer text between BEG and END with NEWTEXT.
Moves point to the end of the new text."
  ;; This should be in subr.el.
  ;; You'd think this is trivial to do, but details matter if you want
  ;; to keep markers "at the right place" and be robust in the face of
  ;; after-change-functions that may themselves modify the buffer.
  (goto-char beg)
  (insert newtext)
  (delete-region (point) (+ (point) (- end beg))))

495 496 497 498 499 500 501 502 503 504 505 506
(defcustom completion-cycle-threshold nil
  "Number of completion candidates below which cycling is used.
Depending on this setting `minibuffer-complete' may use cycling,
like `minibuffer-force-complete'.
If nil, cycling is never used.
If t, cycling is always used.
If an integer, cycling is used as soon as there are fewer completion
candidates than this number."
  :type '(choice (const :tag "No cycling" nil)
          (const :tag "Always cycle" t)
          (integer :tag "Threshold")))

507
(defun completion--do-completion (&optional try-completion-function)
508
  "Do the completion and return a summary of what happened.
509 510 511 512 513 514 515 516 517 518 519 520 521 522
M = completion was performed, the text was Modified.
C = there were available Completions.
E = after completion we now have an Exact match.

 MCE
 000  0 no possible completion
 001  1 was already an exact and unique completion
 010  2 no completion happened
 011  3 was already an exact completion
 100  4 ??? impossible
 101  5 ??? impossible
 110  6 some completion happened
 111  7 completed to an exact completion"
  (let* ((beg (field-beginning))
523
         (end (field-end))
524
         (string (buffer-substring beg end))
525 526 527 528 529 530
         (comp (funcall (or try-completion-function
			    'completion-try-completion)
			string
			minibuffer-completion-table
			minibuffer-completion-predicate
			(- (point) beg))))
531
    (cond
532
     ((null comp)
533
      (minibuffer-hide-completions)
534
      (ding) (minibuffer-message "No match") (minibuffer--bitset nil nil nil))
535
     ((eq t comp)
536
      (minibuffer-hide-completions)
537 538
      (goto-char (field-end))
      (minibuffer--bitset nil nil t)) ;Exact and unique match.
539 540 541 542
     (t
      ;; `completed' should be t if some completion was done, which doesn't
      ;; include simply changing the case of the entered string.  However,
      ;; for appearance, the string is rewritten if the case changes.
543 544 545 546
      (let* ((comp-pos (cdr comp))
	     (completion (car comp))
	     (completed (not (eq t (compare-strings completion nil nil
						    string nil nil t))))
547 548
	     (unchanged (eq t (compare-strings completion nil nil
					       string nil nil nil))))
549
        (if unchanged
550
          (goto-char end)
551 552 553 554
          ;; Insert in minibuffer the chars we got.
          (completion--replace beg end completion))
	;; Move point to its completion-mandated destination.
	(forward-char (- comp-pos (length completion)))
555

556 557 558 559 560
        (if (not (or unchanged completed))
	   ;; The case of the string changed, but that's all.  We're not sure
	   ;; whether this is a unique completion or not, so try again using
	   ;; the real case (this shouldn't recurse again, because the next
	   ;; time try-completion will return either t or the exact string).
561
           (completion--do-completion try-completion-function)
562 563

          ;; It did find a match.  Do we match some possibility exactly now?
564
          (let ((exact (test-completion completion
565
					minibuffer-completion-table
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
					minibuffer-completion-predicate))
                (comps
                 ;; Check to see if we want to do cycling.  We do it
                 ;; here, after having performed the normal completion,
                 ;; so as to take advantage of the difference between
                 ;; try-completion and all-completions, for things
                 ;; like completion-ignored-extensions.
                 (when (and completion-cycle-threshold
                            ;; Check that the completion didn't make
                            ;; us jump to a different boundary.
                            (or (not completed)
                                (< (car (completion-boundaries
                                         (substring completion 0 comp-pos)
                                         minibuffer-completion-table
                                         minibuffer-completion-predicate
                                         ""))
                                   comp-pos)))
                   (completion-all-sorted-completions))))
            (setq completion-all-sorted-completions nil)
            (cond
             ((and (not (ignore-errors
                          ;; This signal an (intended) error if comps is too
                          ;; short or if completion-cycle-threshold is t.
                          (consp (nthcdr completion-cycle-threshold comps))))
                   ;; More than 1, so there's something to cycle.
                   (consp (cdr comps)))
              ;; Fewer than completion-cycle-threshold remaining
              ;; completions: let's cycle.
              (setq completed t exact t)
              (setq completion-all-sorted-completions comps)
              (minibuffer-force-complete))
             (completed
598 599 600
                ;; We could also decide to refresh the completions,
                ;; if they're displayed (and assuming there are
                ;; completions left).
601
              (minibuffer-hide-completions))
602 603 604 605 606 607 608
              ;; Show the completion table, if requested.
               ((not exact)
                (if (case completion-auto-help
                      (lazy (eq this-command last-command))
                      (t completion-auto-help))
                    (minibuffer-completion-help)
                  (minibuffer-message "Next char not unique")))
609 610 611
               ;; If the last exact completion and this one were the same, it
               ;; means we've already given a "Next char not unique" message
               ;; and the user's hit TAB again, so now we give him help.
612
               ((eq this-command last-command)
613
              (if completion-auto-help (minibuffer-completion-help))))
614 615

            (minibuffer--bitset completed t exact))))))))
616 617 618 619 620 621 622 623 624 625 626

(defun minibuffer-complete ()
  "Complete the minibuffer contents as far as possible.
Return nil if there is no valid completion, else t.
If no characters can be completed, display a list of possible completions.
If you repeat this command after it displayed such a list,
scroll the window of possible completions."
  (interactive)
  ;; If the previous command was not this,
  ;; mark the completion buffer obsolete.
  (unless (eq this-command last-command)
627
    (setq completion-all-sorted-completions nil)
628 629
    (setq minibuffer-scroll-window nil))

630
  (cond
631 632
    ;; If there's a fresh completion window with a live buffer,
    ;; and this command is repeated, scroll that window.
633 634
   ((window-live-p minibuffer-scroll-window)
    (let ((window minibuffer-scroll-window))
635 636 637 638 639 640
        (with-current-buffer (window-buffer window)
          (if (pos-visible-in-window-p (point-max) window)
	      ;; If end is in view, scroll up to the beginning.
	      (set-window-start window (point-min) nil)
	    ;; Else scroll down one screen.
	    (scroll-other-window))
641 642 643 644 645 646
        nil)))
   ;; If we're cycling, keep on cycling.
   (completion-all-sorted-completions
    (minibuffer-force-complete)
    t)
   (t (case (completion--do-completion)
647
        (#b000 nil)
648
        (#b001 (minibuffer-message "Sole completion")
649
               t)
650
        (#b011 (minibuffer-message "Complete, but not unique")
651 652
               t)
        (t     t)))))
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
(defvar completion-all-sorted-completions nil)
(make-variable-buffer-local 'completion-all-sorted-completions)

(defun completion--flush-all-sorted-completions (&rest ignore)
  (setq completion-all-sorted-completions nil))

(defun completion-all-sorted-completions ()
  (or completion-all-sorted-completions
      (let* ((start (field-beginning))
             (end (field-end))
             (all (completion-all-completions (buffer-substring start end)
                                              minibuffer-completion-table
                                              minibuffer-completion-predicate
                                              (- (point) start)))
             (last (last all))
             (base-size (or (cdr last) 0)))
        (when last
          (setcdr last nil)
          ;; Prefer shorter completions.
          (setq all (sort all (lambda (c1 c2) (< (length c1) (length c2)))))
          ;; Prefer recently used completions.
          (let ((hist (symbol-value minibuffer-history-variable)))
            (setq all (sort all (lambda (c1 c2)
                                  (> (length (member c1 hist))
                                     (length (member c2 hist)))))))
          ;; Cache the result.  This is not just for speed, but also so that
          ;; repeated calls to minibuffer-force-complete can cycle through
          ;; all possibilities.
          (add-hook 'after-change-functions
                    'completion--flush-all-sorted-completions nil t)
          (setq completion-all-sorted-completions
                (nconc all base-size))))))

(defun minibuffer-force-complete ()
  "Complete the minibuffer to an exact match.
Repeated uses step through the possible completions."
  (interactive)
  ;; FIXME: Need to deal with the extra-size issue here as well.
692 693
  ;; FIXME: ~/src/emacs/t<M-TAB>/lisp/minibuffer.el completes to
  ;; ~/src/emacs/trunk/ and throws away lisp/minibuffer.el.
694 695 696 697 698 699 700 701 702 703 704 705 706
  (let* ((start (field-beginning))
         (end (field-end))
         (all (completion-all-sorted-completions)))
    (if (not (consp all))
        (minibuffer-message (if all "No more completions" "No completions"))
      (goto-char end)
      (insert (car all))
      (delete-region (+ start (cdr (last all))) end)
      ;; If completing file names, (car all) may be a directory, so we'd now
      ;; have a new set of possible completions and might want to reset
      ;; completion-all-sorted-completions to nil, but we prefer not to,
      ;; so that repeated calls minibuffer-force-complete still cycle
      ;; through the previous possible completions.
707 708 709
      (let ((last (last all)))
        (setcdr last (cons (car all) (cdr last)))
        (setq completion-all-sorted-completions (cdr all))))))
710

711
(defvar minibuffer-confirm-exit-commands
712
  '(minibuffer-complete minibuffer-complete-word PC-complete PC-complete-word)
713 714 715
  "A list of commands which cause an immediately following
`minibuffer-complete-and-exit' to ask for extra confirmation.")

716
(defun minibuffer-complete-and-exit ()
717 718 719 720 721 722 723 724 725 726
  "Exit if the minibuffer contains a valid completion.
Otherwise, try to complete the minibuffer contents.  If
completion leads to a valid completion, a repetition of this
command will exit.

If `minibuffer-completion-confirm' is `confirm', do not try to
 complete; instead, ask for confirmation and accept any input if
 confirmed.
If `minibuffer-completion-confirm' is `confirm-after-completion',
 do not try to complete; instead, ask for confirmation if the
727 728 729
 preceding minibuffer command was a member of
 `minibuffer-confirm-exit-commands', and accept the input
 otherwise."
730
  (interactive)
731 732 733 734 735 736 737 738
  (let ((beg (field-beginning))
        (end (field-end)))
    (cond
     ;; Allow user to specify null string
     ((= beg end) (exit-minibuffer))
     ((test-completion (buffer-substring beg end)
                       minibuffer-completion-table
                       minibuffer-completion-predicate)
739 740 741 742 743 744
      ;; FIXME: completion-ignore-case has various slightly
      ;; incompatible meanings.  E.g. it can reflect whether the user
      ;; wants completion to pay attention to case, or whether the
      ;; string will be used in a context where case is significant.
      ;; E.g. usually try-completion should obey the first, whereas
      ;; test-completion should obey the second.
745 746
      (when completion-ignore-case
        ;; Fixup case of the field, if necessary.
747
        (let* ((string (buffer-substring beg end))
748 749 750 751
               (compl (try-completion
                       string
                       minibuffer-completion-table
                       minibuffer-completion-predicate)))
752
          (when (and (stringp compl) (not (equal string compl))
753 754
                     ;; If it weren't for this piece of paranoia, I'd replace
                     ;; the whole thing with a call to do-completion.
755 756 757 758
                     ;; This is important, e.g. when the current minibuffer's
                     ;; content is a directory which only contains a single
                     ;; file, so `try-completion' actually completes to
                     ;; that file.
759
                     (= (length string) (length compl)))
760 761
            (goto-char end)
            (insert compl)
762 763
            (delete-region beg end))))
      (exit-minibuffer))
764

765
     ((memq minibuffer-completion-confirm '(confirm confirm-after-completion))
766
      ;; The user is permitted to exit with an input that's rejected
767
      ;; by test-completion, after confirming her choice.
768 769 770 771 772 773
      (if (or (eq last-command this-command)
              ;; For `confirm-after-completion' we only ask for confirmation
              ;; if trying to exit immediately after typing TAB (this
              ;; catches most minibuffer typos).
              (and (eq minibuffer-completion-confirm 'confirm-after-completion)
                   (not (memq last-command minibuffer-confirm-exit-commands))))
774 775 776
          (exit-minibuffer)
        (minibuffer-message "Confirm")
        nil))
777

778 779 780 781 782
     (t
      ;; Call do-completion, but ignore errors.
      (case (condition-case nil
                (completion--do-completion)
              (error 1))
783 784 785 786 787
        ((#b001 #b011) (exit-minibuffer))
        (#b111 (if (not minibuffer-completion-confirm)
                   (exit-minibuffer)
                 (minibuffer-message "Confirm")
                 nil))
788 789
        (t nil))))))

790 791 792 793
(defun completion--try-word-completion (string table predicate point)
  (let ((comp (completion-try-completion string table predicate point)))
    (if (not (consp comp))
        comp
794

795 796
      ;; If completion finds next char not unique,
      ;; consider adding a space or a hyphen.
797
      (when (= (length string) (length (car comp)))
798 799 800 801 802 803 804 805 806
        ;; Mark the added char with the `completion-word' property, so it
        ;; can be handled specially by completion styles such as
        ;; partial-completion.
        ;; We used to remove `partial-completion' from completion-styles
        ;; instead, but it was too blunt, leading to situations where SPC
        ;; was the only insertable char at point but minibuffer-complete-word
        ;; refused inserting it.
        (let ((exts (mapcar (lambda (str) (propertize str 'completion-try-word t))
                            '(" " "-")))
807 808 809 810
              (before (substring string 0 point))
              (after (substring string point))
	      tem)
	  (while (and exts (not (consp tem)))
811
            (setq tem (completion-try-completion
812 813 814
		       (concat before (pop exts) after)
		       table predicate (1+ point))))
	  (if (consp tem) (setq comp tem))))
815

816 817 818 819 820 821 822
      ;; Completing a single word is actually more difficult than completing
      ;; as much as possible, because we first have to find the "current
      ;; position" in `completion' in order to find the end of the word
      ;; we're completing.  Normally, `string' is a prefix of `completion',
      ;; which makes it trivial to find the position, but with fancier
      ;; completion (plus env-var expansion, ...) `completion' might not
      ;; look anything like `string' at all.
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
      (let* ((comppoint (cdr comp))
	     (completion (car comp))
	     (before (substring string 0 point))
	     (combined (concat before "\n" completion)))
        ;; Find in completion the longest text that was right before point.
        (when (string-match "\\(.+\\)\n.*?\\1" combined)
          (let* ((prefix (match-string 1 before))
                 ;; We used non-greedy match to make `rem' as long as possible.
                 (rem (substring combined (match-end 0)))
                 ;; Find in the remainder of completion the longest text
                 ;; that was right after point.
                 (after (substring string point))
                 (suffix (if (string-match "\\`\\(.+\\).*\n.*\\1"
                                           (concat after "\n" rem))
                             (match-string 1 after))))
            ;; The general idea is to try and guess what text was inserted
            ;; at point by the completion.  Problem is: if we guess wrong,
            ;; we may end up treating as "added by completion" text that was
            ;; actually painfully typed by the user.  So if we then cut
            ;; after the first word, we may throw away things the
            ;; user wrote.  So let's try to be as conservative as possible:
            ;; only cut after the first word, if we're reasonably sure that
            ;; our guess is correct.
            ;; Note: a quick survey on emacs-devel seemed to indicate that
            ;; nobody actually cares about the "word-at-a-time" feature of
            ;; minibuffer-complete-word, whose real raison-d'être is that it
            ;; tries to add "-" or " ".  One more reason to only cut after
            ;; the first word, if we're really sure we're right.
            (when (and (or suffix (zerop (length after)))
                       (string-match (concat
                                      ;; Make submatch 1 as small as possible
                                      ;; to reduce the risk of cutting
                                      ;; valuable text.
                                      ".*" (regexp-quote prefix) "\\(.*?\\)"
                                      (if suffix (regexp-quote suffix) "\\'"))
                                     completion)
                       ;; The new point in `completion' should also be just
                       ;; before the suffix, otherwise something more complex
                       ;; is going on, and we're not sure where we are.
                       (eq (match-end 1) comppoint)
                       ;; (match-beginning 1)..comppoint is now the stretch
                       ;; of text in `completion' that was completed at point.
		       (string-match "\\W" completion (match-beginning 1))
		       ;; Is there really something to cut?
		       (> comppoint (match-end 0)))
              ;; Cut after the first word.
              (let ((cutpos (match-end 0)))
                (setq completion (concat (substring completion 0 cutpos)
                                         (substring completion comppoint)))
                (setq comppoint cutpos)))))

	(cons completion comppoint)))))
875 876 877 878 879 880 881 882


(defun minibuffer-complete-word ()
  "Complete the minibuffer contents at most a single word.
After one word is completed as much as possible, a space or hyphen
is added, provided that matches some possible completion.
Return nil if there is no valid completion, else t."
  (interactive)
883
  (case (completion--do-completion 'completion--try-word-completion)
884
    (#b000 nil)
885
    (#b001 (minibuffer-message "Sole completion")
886
           t)
887
    (#b011 (minibuffer-message "Complete, but not unique")
888 889
           t)
    (t     t)))
890

891 892 893
(defface completions-annotations '((t :inherit italic))
  "Face to use for annotations in the *Completions* buffer.")

894
(defcustom completions-format 'horizontal
895 896 897
  "Define the appearance and sorting of completions.
If the value is `vertical', display completions sorted vertically
in columns in the *Completions* buffer.
898
If the value is `horizontal', display completions sorted
899
horizontally in alphabetical order, rather than down the screen."
900
  :type '(choice (const horizontal) (const vertical))
901 902 903
  :group 'minibuffer
  :version "23.2")

904
(defun completion--insert-strings (strings)
905 906 907 908 909 910 911
  "Insert a list of STRINGS into the current buffer.
Uses columns to keep the listing readable but compact.
It also eliminates runs of equal strings."
  (when (consp strings)
    (let* ((length (apply 'max
			  (mapcar (lambda (s)
				    (if (consp s)
912 913 914
					(+ (string-width (car s))
                                           (string-width (cadr s)))
				      (string-width s)))
915 916 917 918 919 920 921 922 923 924 925
				  strings)))
	   (window (get-buffer-window (current-buffer) 0))
	   (wwidth (if window (1- (window-width window)) 79))
	   (columns (min
		     ;; At least 2 columns; at least 2 spaces between columns.
		     (max 2 (/ wwidth (+ 2 length)))
		     ;; Don't allocate more columns than we can fill.
		     ;; Windows can't show less than 3 lines anyway.
		     (max 1 (/ (length strings) 2))))
	   (colwidth (/ wwidth columns))
           (column 0)
926 927
	   (rows (/ (length strings) columns))
	   (row 0)
928 929 930 931
	   (laststring nil))
      ;; The insertion should be "sensible" no matter what choices were made
      ;; for the parameters above.
      (dolist (str strings)
932
	(unless (equal laststring str) ; Remove (consecutive) duplicates.
933
	  (setq laststring str)
934 935 936 937
          (let ((length (if (consp str)
                            (+ (string-width (car str))
                               (string-width (cadr str)))
                          (string-width str))))
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
            (cond
	     ((eq completions-format 'vertical)
	      ;; Vertical format
	      (when (> row rows)
		(forward-line (- -1 rows))
		(setq row 0 column (+ column colwidth)))
	      (when (> column 0)
		(end-of-line)
		(while (> (current-column) column)
		  (if (eobp)
		      (insert "\n")
		    (forward-line 1)
		    (end-of-line)))
		(insert " \t")
		(set-text-properties (- (point) 1) (point)
				     `(display (space :align-to ,column)))))
	     (t
	      ;; Horizontal format
	      (unless (bolp)
		(if (< wwidth (+ (max colwidth length) column))
		    ;; No space for `str' at point, move to next line.
		    (progn (insert "\n") (setq column 0))
		  (insert " \t")
		  ;; Leave the space unpropertized so that in the case we're
		  ;; already past the goal column, there is still
		  ;; a space displayed.
		  (set-text-properties (- (point) 1) (point)
				       ;; We can't just set tab-width, because
				       ;; completion-setup-function will kill all
				       ;; local variables :-(
				       `(display (space :align-to ,column)))
		  nil))))
970 971 972 973 974
            (if (not (consp str))
                (put-text-property (point) (progn (insert str) (point))
                                   'mouse-face 'highlight)
              (put-text-property (point) (progn (insert (car str)) (point))
                                 'mouse-face 'highlight)
975 976
              (add-text-properties (point) (progn (insert (cadr str)) (point))
                                   '(mouse-face nil
977 978 979 980 981 982 983 984 985 986 987 988 989 990
						face completions-annotations)))
	    (cond
	     ((eq completions-format 'vertical)
	      ;; Vertical format
	      (if (> column 0)
		  (forward-line)
		(insert "\n"))
	      (setq row (1+ row)))
	     (t
	      ;; Horizontal format
	      ;; Next column to align to.
	      (setq column (+ column
			      ;; Round up to a whole number of columns.
			      (* colwidth (ceiling length colwidth))))))))))))
991

992 993
(defvar completion-common-substring nil)
(make-obsolete-variable 'completion-common-substring nil "23.1")
994

995 996 997 998 999
(defvar completion-setup-hook nil
  "Normal hook run at the end of setting up a completion list buffer.
When this hook is run, the current buffer is the one in which the
command to display the completion list buffer was run.
The completion list buffer is available as the value of `standard-output'.
1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
See also `display-completion-list'.")

(defface completions-first-difference
  '((t (:inherit bold)))
  "Face put on the first uncommon character in completions in *Completions* buffer."
  :group 'completion)

(defface completions-common-part
  '((t (:inherit default)))
  "Face put on the common prefix substring in completions in *Completions* buffer.
The idea of `completions-common-part' is that you can use it to
make the common parts less visible than normal, so that the rest
of the differing parts is, by contrast, slightly highlighted."
  :group 'completion)

1015
(defun completion-hilit-commonality (completions prefix-len base-size)
1016
  (when completions
1017
    (let ((com-str-len (- prefix-len (or base-size 0))))
1018 1019
      (nconc
       (mapcar
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
        (lambda (elem)
          (let ((str
                 ;; Don't modify the string itself, but a copy, since the
                 ;; the string may be read-only or used for other purposes.
                 ;; Furthermore, since `completions' may come from
                 ;; display-completion-list, `elem' may be a list.
                 (if (consp elem)
                     (car (setq elem (cons (copy-sequence (car elem))
                                           (cdr elem))))
                   (setq elem (copy-sequence elem)))))
1030 1031 1032 1033 1034
            (put-text-property 0
			       ;; If completion-boundaries returns incorrect
			       ;; values, all-completions may return strings
			       ;; that don't contain the prefix.
			       (min com-str-len (length str))
1035 1036 1037 1038 1039 1040 1041
                               'font-lock-face 'completions-common-part
                               str)
            (if (> (length str) com-str-len)
                (put-text-property com-str-len (1+ com-str-len)
                                   'font-lock-face 'completions-first-difference
                                   str)))
          elem)
1042 1043
        completions)
       base-size))))
1044

1045
(defun display-completion-list (completions &optional common-substring)
1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
  "Display the list of completions, COMPLETIONS, using `standard-output'.
Each element may be just a symbol or string
or may be a list of two strings to be printed as if concatenated.
If it is a list of two strings, the first is the actual completion
alternative, the second serves as annotation.
`standard-output' must be a buffer.
The actual completion alternatives, as inserted, are given `mouse-face'
properties of `highlight'.
At the end, this runs the normal hook `completion-setup-hook'.
It can find the completion buffer in `standard-output'.
1056

1057
The obsolete optional arg COMMON-SUBSTRING, if non-nil, should be a string
1058 1059
specifying a common substring for adding the faces
`completions-first-difference' and `completions-common-part' to
1060
the completions buffer."
1061 1062
  (if common-substring
      (setq completions (completion-hilit-commonality
1063 1064 1065
                         completions (length common-substring)
                         ;; We don't know the base-size.
                         nil)))
1066 1067 1068 1069 1070
  (if (not (bufferp standard-output))
      ;; This *never* (ever) happens, so there's no point trying to be clever.
      (with-temp-buffer
	(let ((standard-output (current-buffer))
	      (completion-setup-hook nil))
1071
	  (display-completion-list completions common-substring))
1072 1073
	(princ (buffer-string)))

1074 1075 1076 1077 1078 1079
    (with-current-buffer standard-output
      (goto-char (point-max))
      (if (null completions)
          (insert "There are no possible completions of what you have typed.")
        (insert "Possible completions are:\n")
        (completion--insert-strings completions))))
1080

1081 1082
  ;; The hilit used to be applied via completion-setup-hook, so there
  ;; may still be some code that uses completion-common-substring.
1083 1084 1085
  (with-no-warnings
    (let ((completion-common-substring common-substring))
      (run-hooks 'completion-setup-hook)))
1086 1087
  nil)

1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104
(defvar completion-annotate-function
  nil
  ;; Note: there's a lot of scope as for when to add annotations and
  ;; what annotations to add.  E.g. completing-help.el allowed adding
  ;; the first line of docstrings to M-x completion.  But there's
  ;; a tension, since such annotations, while useful at times, can
  ;; actually drown the useful information.
  ;; So completion-annotate-function should be used parsimoniously, or
  ;; else only used upon a user's request (e.g. we could add a command
  ;; to completion-list-mode to add annotations to the current
  ;; completions).
  "Function to add annotations in the *Completions* buffer.
The function takes a completion and should either return nil, or a string that
will be displayed next to the completion.  The function can access the
completion table and predicates via `minibuffer-completion-table' and related
variables.")

1105 1106 1107 1108
(defun minibuffer-completion-help ()
  "Display a list of possible completions of the current minibuffer contents."
  (interactive)
  (message "Making completion list...")
Michael Albinus's avatar
Michael Albinus committed
1109 1110
  (let* ((non-essential t)
	 (start (field-beginning))
1111
         (string (field-string))
1112
         (completions (completion-all-completions
1113 1114
                       string
                       minibuffer-completion-table
1115 1116
                       minibuffer-completion-predicate
                       (- (point) (field-beginning)))))
1117 1118
    (message nil)
    (if (and completions
1119 1120
             (or (consp (cdr completions))
                 (not (equal (car completions) string))))
1121 1122 1123 1124 1125 1126 1127 1128
        (let* ((last (last completions))
               (base-size (cdr last))
               ;; If the *Completions* buffer is shown in a new
               ;; window, mark it as softly-dedicated, so bury-buffer in
               ;; minibuffer-hide-completions will know whether to
               ;; delete the window or not.
               (display-buffer-mark-dedicated 'soft))
          (with-output-to-temp-buffer "*Completions*"
1129 1130 1131
            ;; Remove the base-size tail because `sort' requires a properly
            ;; nil-terminated list.
            (when last (setcdr last nil))