1 ;;; minibuf.el --- Minibuffer functions for XEmacs
3 ;; Copyright (C) 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
4 ;; Copyright (C) 1995 Tinker Systems
5 ;; Copyright (C) 1995, 1996 Ben Wing
7 ;; Author: Richard Mlynarik
9 ;; Maintainer: XEmacs Development Team
10 ;; Keywords: internal, dumped
12 ;; This file is part of XEmacs.
14 ;; XEmacs is free software; you can redistribute it and/or modify it
15 ;; under the terms of the GNU General Public License as published by
16 ;; the Free Software Foundation; either version 2, or (at your option)
19 ;; XEmacs is distributed in the hope that it will be useful, but
20 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 ;; General Public License for more details.
24 ;; You should have received a copy of the GNU General Public License
25 ;; along with XEmacs; see the file COPYING. If not, write to the
26 ;; Free Software Foundation, 59 Temple Place - Suite 330,
27 ;; Boston, MA 02111-1307, USA.
29 ;;; Synched up with: all the minibuffer history stuff is synched with
30 ;;; 19.30. Not sure about the rest.
34 ;; This file is dumped with XEmacs.
36 ;; Written by Richard Mlynarik 2-Oct-92
38 ;; 06/11/1997 - Use char-(after|before) instead of
39 ;; (following|preceding)-char. -slb
43 (defgroup minibuffer nil
44 "Controling the behavior of the minibuffer."
48 (defcustom insert-default-directory t
49 "*Non-nil means when reading a filename start with default dir in minibuffer."
53 (defcustom minibuffer-history-uniquify t
54 "*Non-nil means when adding an item to a minibuffer history, remove
55 previous occurances of the same item from the history list first,
56 rather than just consing the new element onto the front of the list."
60 (defvar minibuffer-completion-table nil
61 "Alist or obarray used for completion in the minibuffer.
62 This becomes the ALIST argument to `try-completion' and `all-completions'.
64 The value may alternatively be a function, which is given three arguments:
65 STRING, the current buffer contents;
66 PREDICATE, the predicate for filtering possible matches;
67 CODE, which says what kind of things to do.
68 CODE can be nil, t or `lambda'.
69 nil means to return the best completion of STRING, nil if there is none,
70 or t if it is already a unique completion.
71 t means to return a list of all possible completions of STRING.
72 `lambda' means to return t if STRING is a valid completion as it stands.")
74 (defvar minibuffer-completion-predicate nil
75 "Within call to `completing-read', this holds the PREDICATE argument.")
77 (defvar minibuffer-completion-confirm nil
78 "Non-nil => demand confirmation of completion before exiting minibuffer.")
80 (defvar minibuffer-confirm-incomplete nil
81 "If true, then in contexts where completing-read allows answers which
82 are not valid completions, an extra RET must be typed to confirm the
83 response. This is helpful for catching typos, etc.")
85 (defcustom completion-auto-help t
86 "*Non-nil means automatically provide help for invalid completion input."
90 (defcustom enable-recursive-minibuffers nil
91 "*Non-nil means to allow minibuffer commands while in the minibuffer.
92 More precisely, this variable makes a difference when the minibuffer window
93 is the selected window. If you are in some other window, minibuffer commands
94 are allowed even if a minibuffer is active."
98 (defcustom minibuffer-max-depth 1
99 ;; See comment in #'minibuffer-max-depth-exceeded
100 "*Global maximum number of minibuffers allowed;
101 compare to enable-recursive-minibuffers, which is only consulted when the
102 minibuffer is reinvoked while it is the selected window."
103 :type '(choice integer
104 (const :tag "Indefinite" nil))
107 ;; Moved to C. The minibuffer prompt must be setup before this is run
108 ;; and that can only be done from the C side.
109 ;(defvar minibuffer-setup-hook nil
110 ; "Normal hook run just after entry to minibuffer.")
112 (defvar minibuffer-exit-hook nil
113 "Normal hook run just after exit from minibuffer.")
115 (defvar minibuffer-help-form nil
116 "Value that `help-form' takes on inside the minibuffer.")
118 (defvar minibuffer-default nil
119 "Default value for minibuffer input.")
121 (defvar minibuffer-local-map
122 (let ((map (make-sparse-keymap 'minibuffer-local-map)))
124 "Default keymap to use when reading from the minibuffer.")
126 (defvar minibuffer-local-completion-map
127 (let ((map (make-sparse-keymap 'minibuffer-local-completion-map)))
128 (set-keymap-parents map (list minibuffer-local-map))
130 "Local keymap for minibuffer input with completion.")
132 (defvar minibuffer-local-must-match-map
133 (let ((map (make-sparse-keymap 'minibuffer-must-match-map)))
134 (set-keymap-parents map (list minibuffer-local-completion-map))
136 "Local keymap for minibuffer input with completion, for exact match.")
138 ;; (define-key minibuffer-local-map "\C-g" 'abort-recursive-edit)
139 (define-key minibuffer-local-map "\C-g" 'minibuffer-keyboard-quit) ;; moved here from pending-del.el
140 (define-key minibuffer-local-map "\r" 'exit-minibuffer)
141 (define-key minibuffer-local-map "\n" 'exit-minibuffer)
143 ;; Historical crock. Unused by anything but user code, if even that
144 ;(defvar minibuffer-local-ns-map
145 ; (let ((map (make-sparse-keymap 'minibuffer-local-ns-map)))
146 ; (set-keymap-parents map (list minibuffer-local-map))
148 ; "Local keymap for the minibuffer when spaces are not allowed.")
149 ;(define-key minibuffer-local-ns-map [space] 'exit-minibuffer)
150 ;(define-key minibuffer-local-ns-map [tab] 'exit-minibuffer)
151 ;(define-key minibuffer-local-ns-map [?\?] 'self-insert-and-exit)
153 (define-key minibuffer-local-completion-map "\t" 'minibuffer-complete)
154 (define-key minibuffer-local-completion-map " " 'minibuffer-complete-word)
155 (define-key minibuffer-local-completion-map "?" 'minibuffer-completion-help)
156 (define-key minibuffer-local-must-match-map "\r" 'minibuffer-complete-and-exit)
157 (define-key minibuffer-local-must-match-map "\n" 'minibuffer-complete-and-exit)
159 (define-key minibuffer-local-map "\M-n" 'next-history-element)
160 (define-key minibuffer-local-map "\M-p" 'previous-history-element)
161 (define-key minibuffer-local-map '[next] "\M-n")
162 (define-key minibuffer-local-map '[prior] "\M-p")
163 (define-key minibuffer-local-map "\M-r" 'previous-matching-history-element)
164 (define-key minibuffer-local-map "\M-s" 'next-matching-history-element)
165 (define-key minibuffer-local-must-match-map [next]
166 'next-complete-history-element)
167 (define-key minibuffer-local-must-match-map [prior]
168 'previous-complete-history-element)
170 ;; This is an experiment--make up and down arrows do history.
171 (define-key minibuffer-local-map [up] 'previous-history-element)
172 (define-key minibuffer-local-map [down] 'next-history-element)
173 (define-key minibuffer-local-completion-map [up] 'previous-history-element)
174 (define-key minibuffer-local-completion-map [down] 'next-history-element)
175 (define-key minibuffer-local-must-match-map [up] 'previous-history-element)
176 (define-key minibuffer-local-must-match-map [down] 'next-history-element)
178 (defvar read-expression-map (let ((map (make-sparse-keymap
179 'read-expression-map)))
180 (set-keymap-parents map
181 (list minibuffer-local-map))
182 (define-key map "\M-\t" 'lisp-complete-symbol)
184 "Minibuffer keymap used for reading Lisp expressions.")
186 (defvar read-shell-command-map
187 (let ((map (make-sparse-keymap 'read-shell-command-map)))
188 (set-keymap-parents map (list minibuffer-local-map))
189 (define-key map "\t" 'comint-dynamic-complete)
190 (define-key map "\M-\t" 'comint-dynamic-complete)
191 (define-key map "\M-?" 'comint-dynamic-list-completions)
193 "Minibuffer keymap used by shell-command and related commands.")
195 (defcustom use-dialog-box t
196 "*Variable controlling usage of the dialog box.
197 If nil, the dialog box will never be used, even in response to mouse events."
201 (defcustom minibuffer-electric-file-name-behavior t
202 "*If non-nil, slash and tilde in certain places cause immediate deletion.
203 These are the same places where this behavior would occur later on anyway,
204 in `substitute-in-file-name'."
208 ;; originally by Stig@hackvan.com
209 (defun minibuffer-electric-separator ()
211 (let ((c last-command-char))
212 (and minibuffer-electric-file-name-behavior
213 (eq c directory-sep-char)
214 (eq c (char-before (point)))
216 (goto-char (point-min))
217 (and (looking-at "/.+:~?[^/]*/.+")
218 (re-search-forward "^/.+:~?[^/]*" nil t)
220 (delete-region (point) (point-max))
223 (goto-char (point-min))
224 (and (looking-at ".+://[^/]*/.+")
225 (re-search-forward "^.+:/" nil t)
227 (delete-region (point) (point-max))
229 ;; permit `//hostname/path/to/file'
230 (not (eq (point) (1+ (point-min))))
231 ;; permit `http://url/goes/here'
232 (or (not (eq ?: (char-after (- (point) 2))))
233 (eq ?/ (char-after (point-min))))
234 (delete-region (point-min) (point)))
237 (defun minibuffer-electric-tilde ()
239 (and minibuffer-electric-file-name-behavior
240 (eq directory-sep-char (char-before (point)))
241 ;; permit URL's with //, for e.g. http://hostname/~user
242 (not (save-excursion (search-backward "//" nil t)))
243 (delete-region (point-min) (point)))
247 (defvar read-file-name-map
248 (let ((map (make-sparse-keymap 'read-file-name-map)))
249 (set-keymap-parents map (list minibuffer-local-completion-map))
250 (define-key map (vector directory-sep-char) 'minibuffer-electric-separator)
251 (define-key map "~" 'minibuffer-electric-tilde)
255 (defvar read-file-name-must-match-map
256 (let ((map (make-sparse-keymap 'read-file-name-map)))
257 (set-keymap-parents map (list minibuffer-local-must-match-map))
258 (define-key map (vector directory-sep-char) 'minibuffer-electric-separator)
259 (define-key map "~" 'minibuffer-electric-tilde)
263 (defun minibuffer-keyboard-quit ()
264 "Abort recursive edit.
265 If `zmacs-regions' is true, and the zmacs region is active in this buffer,
266 then this key deactivates the region without beeping."
268 (if (and (region-active-p)
269 (eq (current-buffer) (zmacs-region-buffer)))
270 ;; pseudo-zmacs compatibility: don't beep if this ^G is simply
271 ;; deactivating the region. If it is inactive, beep.
273 (abort-recursive-edit)))
275 ;;;; Guts of minibuffer invocation
277 ;;#### The only things remaining in C are
278 ;; "Vminibuf_prompt" and the display junk
279 ;; "minibuf_prompt_width" and "minibuf_prompt_pix_width"
280 ;; Also "active_frame", though I suspect I could already
281 ;; hack that in Lisp if I could make any sense of the
282 ;; complete mess of frame/frame code in XEmacs.
283 ;; Vminibuf_prompt could easily be made Lisp-bindable.
284 ;; I suspect that minibuf_prompt*_width are actually recomputed
285 ;; by redisplay as needed -- or could be arranged to be so --
286 ;; and that there could be need for read-minibuffer-internal to
287 ;; save and restore them.
288 ;;#### The only other thing which read-from-minibuffer-internal does
289 ;; which we can't presently do in Lisp is move the frame cursor
290 ;; to the start of the minibuffer line as it returns. This is
291 ;; a rather nice touch and should be preserved -- probably by
292 ;; providing some Lisp-level mechanism (extension to cursor-in-echo-area ?)
296 ;; Like reset_buffer in FSF's buffer.c
297 ;; (Except that kill-all-local-variables doesn't nuke 'permanent-local
298 ;; variables -- we preserve them, reset_buffer doesn't.)
299 (defun reset-buffer (buffer)
300 (with-current-buffer buffer
301 ;(if (fboundp 'unlock-buffer) (unlock-buffer))
302 (kill-all-local-variables)
303 (setq buffer-read-only nil)
304 ;; don't let read only text yanked into the minibuffer
305 ;; permanently wedge it.
306 (make-local-variable 'inhibit-read-only)
307 (setq inhibit-read-only t)
309 ;(setq default-directory nil)
310 (setq buffer-file-name nil)
311 (setq buffer-file-truename nil)
312 (set-buffer-modified-p nil)
313 (setq buffer-backed-up nil)
314 (setq buffer-auto-save-file-name nil)
315 (set-buffer-dedicated-frame buffer nil)
318 (defvar minibuffer-history-variable 'minibuffer-history
319 "History list symbol to add minibuffer values to.
320 Each minibuffer output is added with
321 (set minibuffer-history-variable
322 (cons STRING (symbol-value minibuffer-history-variable)))")
323 (defvar minibuffer-history-position)
326 (defvar initial-minibuffer-history-position)
327 (defvar current-minibuffer-contents)
328 (defvar current-minibuffer-point)
330 (defcustom minibuffer-history-minimum-string-length nil
331 "*If this variable is non-nil, a string will not be added to the
332 minibuffer history if its length is less than that value."
333 :type '(choice (const :tag "Any" nil)
337 (define-error 'input-error "Keyboard input error")
339 (put 'input-error 'display-error
340 #'(lambda (error-object stream)
341 (princ (cadr error-object) stream)))
343 (defun read-from-minibuffer (prompt &optional initial-contents
349 "Read a string from the minibuffer, prompting with string PROMPT.
350 If optional second arg INITIAL-CONTENTS is non-nil, it is a string
351 to be inserted into the minibuffer before reading input.
352 If INITIAL-CONTENTS is (STRING . POSITION), the initial input
353 is STRING, but point is placed POSITION characters into the string.
354 Third arg KEYMAP is a keymap to use while reading;
355 if omitted or nil, the default is `minibuffer-local-map'.
356 If fourth arg READ is non-nil, then interpret the result as a lisp object
357 and return that object:
358 in other words, do `(car (read-from-string INPUT-STRING))'
359 Fifth arg HISTORY, if non-nil, specifies a history list
360 and optionally the initial position in the list.
361 It can be a symbol, which is the history list variable to use,
362 or it can be a cons cell (HISTVAR . HISTPOS).
363 In that case, HISTVAR is the history list variable to use,
364 and HISTPOS is the initial position (the position in the list
365 which INITIAL-CONTENTS corresponds to).
366 If HISTORY is `t', no history will be recorded.
367 Positions are counted starting from 1 at the beginning of the list.
368 Sixth arg ABBREV-TABLE, if non-nil, becomes the value of `local-abbrev-table'
370 Seventh arg DEFAULT, if non-nil, will be returned when user enters
373 See also the variable completion-highlight-first-word-only for control over
375 (if (and (not enable-recursive-minibuffers)
376 (> (minibuffer-depth) 0)
377 (eq (selected-window) (minibuffer-window)))
378 (error "Command attempted to use minibuffer while in minibuffer"))
380 (if (and minibuffer-max-depth
381 (> minibuffer-max-depth 0)
382 (>= (minibuffer-depth) minibuffer-max-depth))
383 (minibuffer-max-depth-exceeded))
385 ;; catch this error before the poor user has typed something...
387 (if (symbolp history)
389 (error "History list %S is unbound" history))
390 (or (boundp (car history))
391 (error "History list %S is unbound" (car history)))))
395 ;; XEmacs in -batch mode calls minibuffer: print the prompt.
396 (message "%s" (gettext prompt))
399 ;;#### Should this even be falling though to the code below?
400 ;;#### How does this stuff work now, anyway?
402 (let* ((dir default-directory)
403 (owindow (selected-window))
404 (oframe (selected-frame))
405 (window (minibuffer-window))
406 (buffer (if (eq (minibuffer-depth) 0)
407 (window-buffer window)
408 (get-buffer-create (format " *Minibuf-%d"
409 (minibuffer-depth)))))
410 (frame (window-frame window))
411 (mconfig (if (eq frame (selected-frame))
412 nil (current-window-configuration frame)))
413 (oconfig (current-window-configuration))
414 ;; dynamic scope sucks sucks sucks sucks sucks sucks.
415 ;; `M-x doctor' makes history a local variable, and thus
416 ;; our binding above is buffer-local and doesn't apply
417 ;; once we switch buffers!!!! We demand better scope!
419 (minibuffer-default default))
422 (set-buffer (reset-buffer buffer))
423 (setq default-directory dir)
424 (make-local-variable 'print-escape-newlines)
425 (setq print-escape-newlines t)
426 (make-local-variable 'current-minibuffer-contents)
427 (make-local-variable 'current-minibuffer-point)
428 (make-local-variable 'initial-minibuffer-history-position)
429 (setq current-minibuffer-contents ""
430 current-minibuffer-point 1)
431 (if (not minibuffer-smart-completion-tracking-behavior)
433 (make-local-variable 'mode-motion-hook)
436 (setq mode-motion-hook 'minibuffer-smart-mouse-tracker))
437 (make-local-variable 'mouse-track-click-hook)
438 (add-hook 'mouse-track-click-hook
439 'minibuffer-smart-maybe-select-highlighted-completion))
440 (set-window-buffer window buffer)
441 (select-window window)
442 (set-window-hscroll window 0)
443 (buffer-enable-undo buffer)
446 (if (consp initial-contents)
448 (insert (car initial-contents))
449 (goto-char (1+ (cdr initial-contents)))
450 (setq current-minibuffer-contents (car initial-contents)
451 current-minibuffer-point (cdr initial-contents)))
452 (insert initial-contents)
453 (setq current-minibuffer-contents initial-contents
454 current-minibuffer-point (point))))
455 (use-local-map (help-keymap-with-help-key
456 (or keymap minibuffer-local-map)
457 minibuffer-help-form))
458 (let ((mouse-grabbed-buffer
459 (and minibuffer-smart-completion-tracking-behavior
461 (current-prefix-arg current-prefix-arg)
462 ;; (help-form minibuffer-help-form)
463 (minibuffer-history-variable (cond ((not _history_)
469 (minibuffer-history-position (cond ((consp _history_)
473 (minibuffer-scroll-window owindow))
474 (setq initial-minibuffer-history-position
475 minibuffer-history-position)
477 (setq local-abbrev-table abbrev-table
479 ;; This is now run from read-minibuffer-internal
480 ;(if minibuffer-setup-hook
481 ; (run-hooks 'minibuffer-setup-hook))
485 (if (> (recursion-depth) (minibuffer-depth))
486 (let ((standard-output t)
488 (read-minibuffer-internal prompt))
489 (read-minibuffer-internal prompt))))
490 ;; Translate an "abort" (throw 'exit 't)
494 (let* ((val (progn (set-buffer buffer)
495 (if minibuffer-exit-hook
496 (run-hooks 'minibuffer-exit-hook))
497 (if (and (eq (char-after (point-min)) nil)
501 (histval (if (and default (string= val ""))
507 (let ((v (read-from-string val)))
508 (if (< (cdr v) (length val))
510 (or (string-match "[ \t\n]*\\'" val (cdr v))
511 (error "Trailing garbage following expression"))))
513 ;; total total kludge
514 (if (stringp v) (setq v (list 'quote v)))
518 '(input-error "End of input before end of expression")))
519 (error (setq err e))))
520 ;; Add the value to the appropriate history list unless
521 ;; it's already the most recent element, or it's only
522 ;; two characters long.
523 (if (and (symbolp minibuffer-history-variable)
524 (boundp minibuffer-history-variable))
525 (let ((list (symbol-value minibuffer-history-variable)))
528 (and list (equal histval (car list)))
530 minibuffer-history-minimum-string-length
532 minibuffer-history-minimum-string-length))
533 (set minibuffer-history-variable
534 (if minibuffer-history-uniquify
535 (cons histval (remove histval list))
536 (cons histval list))))))
537 (if err (signal (car err) (cdr err)))
539 ;; stupid display code requires this for some reason
541 (buffer-disable-undo buffer)
542 (setq buffer-read-only nil)
545 ;; restore frame configurations
546 (if (and mconfig (frame-live-p oframe)
547 (eq frame (selected-frame)))
548 ;; if we changed frames (due to surrogate minibuffer),
549 ;; and we're still on the new frame, go back to the old one.
550 (select-frame oframe))
551 (if mconfig (set-window-configuration mconfig))
552 (set-window-configuration oconfig))))
555 (defun minibuffer-max-depth-exceeded ()
557 ;; This signals an error if an Nth minibuffer is invoked while N-1 are
558 ;; already active, whether the minibuffer window is selected or not.
559 ;; Since, under X, it's easy to jump out of the minibuffer (by doing M-x,
560 ;; getting distracted, and clicking elsewhere) many many novice users have
561 ;; had the problem of having multiple minibuffers build up, even to the
562 ;; point of exceeding max-lisp-eval-depth. Since the variable
563 ;; enable-recursive-minibuffers historically/crockishly is only consulted
564 ;; when the minibuffer is currently active (like typing M-x M-x) it doesn't
565 ;; help in this situation.
567 ;; This routine also offers to edit .emacs for you to get rid of this
568 ;; complaint, like `disabled' commands do, since it's likely that non-novice
569 ;; users will be annoyed by this change, so we give them an easy way to get
570 ;; rid of it forever.
572 (beep t 'minibuffer-limit-exceeded)
574 "Minibuffer already active: abort it with `^]', enable new one with `n': ")
575 (let ((char (let ((cursor-in-echo-area t)) ; #### doesn't always work??
580 ((y-or-n-p "Enable recursive minibuffers for other sessions too? ")
581 ;; This is completely disgusting, but it's basically what novice.el
582 ;; does. This kind of thing should be generalized.
583 (setq minibuffer-max-depth nil)
587 (substitute-in-file-name custom-file)))
588 (goto-char (point-min))
589 (if (re-search-forward
590 "^(setq minibuffer-max-depth \\([0-9]+\\|'?nil\\|'?()\\))\n"
592 (delete-region (match-beginning 0 ) (match-end 0))
593 ;; Must have been disabled by default.
594 (goto-char (point-max)))
595 (insert"\n(setq minibuffer-max-depth nil)\n")
597 (message "Multiple minibuffers enabled")
600 (abort-recursive-edit))
602 (error "Minibuffer already active")))))
605 ;;;; Guts of minibuffer completion
608 ;; Used by minibuffer-do-completion
609 (defvar last-exact-completion)
611 (defun temp-minibuffer-message (m)
612 (let ((savemax (point-max)))
614 (goto-char (point-max))
617 (let ((inhibit-quit t))
619 (delete-region savemax (point-max))
620 ;; If the user types a ^G while we're in sit-for, then quit-flag
621 ;; gets set. In this case, we want that ^G to be interpreted
622 ;; as a normal character, and act just like typeahead.
623 (if (and quit-flag (not unread-command-event))
624 (setq unread-command-event (character-to-event (quit-char))
628 ;; Determines whether buffer-string is an exact completion
629 (defun exact-minibuffer-completion-p (buffer-string)
630 (cond ((not minibuffer-completion-table)
633 ((vectorp minibuffer-completion-table)
634 (let ((tem (intern-soft buffer-string
635 minibuffer-completion-table)))
637 (and (string-equal buffer-string "nil")
638 ;; intern-soft loses for 'nil
640 (mapatoms #'(lambda (s)
645 minibuffer-completion-table)
647 (if minibuffer-completion-predicate
648 (funcall minibuffer-completion-predicate
652 ((and (consp minibuffer-completion-table)
653 ;;#### Emacs-Lisp truly sucks!
654 ;; lambda, autoload, etc
655 (not (symbolp (car minibuffer-completion-table))))
656 (if (not completion-ignore-case)
657 (assoc buffer-string minibuffer-completion-table)
658 (let ((s (upcase buffer-string))
659 (tail minibuffer-completion-table)
662 (setq tem (car (car tail)))
663 (if (or (equal tem buffer-string)
665 (if tem (equal (upcase tem) s)))
668 (setq tail (cdr tail))))
671 (funcall minibuffer-completion-table
673 minibuffer-completion-predicate
677 ;; 0 'none no possible completion
678 ;; 1 'unique was already an exact and unique completion
679 ;; 3 'exact was already an exact (but nonunique) completion
680 ;; NOT USED 'completed-exact-unique completed to an exact and completion
681 ;; 4 'completed-exact completed to an exact (but nonunique) completion
682 ;; 5 'completed some completion happened
683 ;; 6 'uncompleted no completion happened
684 (defun minibuffer-do-completion-1 (buffer-string completion)
685 (cond ((not completion)
688 ;; exact and unique match
691 ;; It did find a match. Do we match some possibility exactly now?
692 (let ((completedp (not (string-equal completion buffer-string))))
695 ;; Some completion happened
698 (setq buffer-string completion)))
699 (if (exact-minibuffer-completion-p buffer-string)
700 ;; An exact completion was possible
702 ;; Since no callers need to know the difference, don't bother
703 ;; with this (potentially expensive) discrimination.
704 ;; (if (eq (try-completion completion
705 ;; minibuffer-completion-table
706 ;; minibuffer-completion-predicate)
708 ;; 'completed-exact-unique
712 ;; Not an exact match
718 (defun minibuffer-do-completion (buffer-string)
719 (let* ((completion (try-completion buffer-string
720 minibuffer-completion-table
721 minibuffer-completion-predicate))
722 (status (minibuffer-do-completion-1 buffer-string completion))
723 (last last-exact-completion))
724 (setq last-exact-completion nil)
725 (cond ((eq status 'none)
727 (ding nil 'no-completion)
728 (temp-minibuffer-message " [No match]"))
732 ;; It did find a match. Do we match some possibility exactly now?
733 (if (not (string-equal completion buffer-string))
735 ;; Some completion happened
738 (setq buffer-string completion)))
739 (cond ((eq status 'exact)
740 ;; If the last exact completion and this one were
741 ;; the same, it means we've already given a
742 ;; "Complete but not unique" message and that the
743 ;; user's hit TAB again, so now we give help.
744 (setq last-exact-completion completion)
745 (if (equal buffer-string last)
746 (minibuffer-completion-help)))
747 ((eq status 'uncompleted)
748 (if completion-auto-help
749 (minibuffer-completion-help)
750 (temp-minibuffer-message " [Next char not unique]")))
758 (defun completing-read (prompt table
759 &optional predicate require-match
760 initial-contents history default)
761 "Read a string in the minibuffer, with completion.
762 Args: PROMPT, TABLE, PREDICATE, REQUIRE-MATCH, INITIAL-CONTENTS, HISTORY.
763 PROMPT is a string to prompt with; normally it ends in a colon and a space.
764 TABLE is an alist whose elements' cars are strings, or an obarray.
765 PREDICATE limits completion to a subset of TABLE.
766 See `try-completion' for more details on completion, TABLE, and PREDICATE.
767 If REQUIRE-MATCH is non-nil, the user is not allowed to exit unless
768 the input is (or completes to) an element of TABLE or is null.
769 If it is also not t, Return does not exit if it does non-null completion.
770 If INITIAL-CONTENTS is non-nil, insert it in the minibuffer initially.
771 If it is (STRING . POSITION), the initial input
772 is STRING, but point is placed POSITION characters into the string.
773 HISTORY, if non-nil, specifies a history list
774 and optionally the initial position in the list.
775 It can be a symbol, which is the history list variable to use,
776 or it can be a cons cell (HISTVAR . HISTPOS).
777 In that case, HISTVAR is the history list variable to use,
778 and HISTPOS is the initial position (the position in the list
779 which INITIAL-CONTENTS corresponds to).
780 If HISTORY is `t', no history will be recorded.
781 Positions are counted starting from 1 at the beginning of the list.
782 DEFAULT, if non-nil, is the default value.
783 Completion ignores case if the ambient value of
784 `completion-ignore-case' is non-nil."
785 (let ((minibuffer-completion-table table)
786 (minibuffer-completion-predicate predicate)
787 (minibuffer-completion-confirm (if (eq require-match 't) nil t))
788 (last-exact-completion nil)
790 (setq ret (read-from-minibuffer prompt
792 (if (not require-match)
793 minibuffer-local-completion-map
794 minibuffer-local-must-match-map)
799 (if (and (string= ret "")
805 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
806 ;;;; Minibuffer completion commands ;;;;
807 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
810 (defun minibuffer-complete ()
811 "Complete the minibuffer contents as far as possible.
812 Return nil if there is no valid completion, else t.
813 If no characters can be completed, display a list of possible completions.
814 If you repeat this command after it displayed such a list,
815 scroll the window of possible completions."
817 ;; If the previous command was not this, then mark the completion
819 (or (eq last-command this-command)
820 (setq minibuffer-scroll-window nil))
821 (let ((window minibuffer-scroll-window))
822 (if (and window (windowp window) (window-buffer window)
823 (buffer-name (window-buffer window)))
824 ;; If there's a fresh completion window with a live buffer
825 ;; and this command is repeated, scroll that window.
826 (let ((obuf (current-buffer)))
829 (set-buffer (window-buffer window))
830 (if (pos-visible-in-window-p (point-max) window)
831 ;; If end is in view, scroll up to the beginning.
832 (set-window-start window (point-min))
833 ;; Else scroll down one frame.
834 (scroll-other-window)))
837 (let ((status (minibuffer-do-completion (buffer-string))))
838 (if (eq status 'none)
841 (cond ((eq status 'unique)
842 (temp-minibuffer-message
843 " [Sole completion]"))
845 (temp-minibuffer-message
846 " [Complete, but not unique]")))
850 (defun minibuffer-complete-and-exit ()
851 "Complete the minibuffer contents, and maybe exit.
852 Exit if the name is valid with no completion needed.
853 If name was completed to a valid match,
854 a repetition of this command will exit."
856 (if (= (point-min) (point-max))
857 ;; Crockishly allow user to specify null string
859 (let ((buffer-string (buffer-string)))
860 ;; Short-cut -- don't call minibuffer-do-completion if we already
861 ;; have an (possibly nonunique) exact completion.
862 (if (exact-minibuffer-completion-p buffer-string)
864 (let ((status (minibuffer-do-completion buffer-string)))
865 (if (or (eq status 'unique)
867 (if (or (eq status 'completed-exact)
868 (eq status 'completed-exact-unique))
869 (if minibuffer-completion-confirm
870 (progn (temp-minibuffer-message " [Confirm]")
873 (throw 'exit nil)))))
876 (defun self-insert-and-exit ()
877 "Terminate minibuffer input."
879 (self-insert-command 1)
882 (defun exit-minibuffer ()
883 "Terminate this minibuffer argument.
884 If minibuffer-confirm-incomplete is true, and we are in a completing-read
885 of some kind, and the contents of the minibuffer is not an existing
886 completion, requires an additional RET before the minibuffer will be exited
887 \(assuming that RET was the character that invoked this command:
888 the character in question must be typed again)."
890 (if (not minibuffer-confirm-incomplete)
892 (let ((buffer-string (buffer-string)))
893 (if (exact-minibuffer-completion-p buffer-string)
895 (let ((completion (if (not minibuffer-completion-table)
897 (try-completion buffer-string
898 minibuffer-completion-table
899 minibuffer-completion-predicate))))
900 (if (or (eq completion 't)
901 ;; Crockishly allow user to specify null string
902 (string-equal buffer-string ""))
904 (if completion ;; rewritten for I18N3 snarfing
905 (temp-minibuffer-message " [incomplete; confirm]")
906 (temp-minibuffer-message " [no completions; confirm]"))
907 (let ((event (let ((inhibit-quit t))
910 (setq quit-flag nil)))))
911 (cond ((equal event last-command-event)
913 ((equal (quit-char) (event-to-character event))
916 (dispatch-event event)))))
918 ;;;; minibuffer-complete-word
921 ;;;#### I think I have done this correctly; it certainly is simpler
922 ;;;#### than what the C code seemed to be trying to do.
923 (defun minibuffer-complete-word ()
924 "Complete the minibuffer contents at most a single word.
925 After one word is completed as much as possible, a space or hyphen
926 is added, provided that matches some possible completion.
927 Return nil if there is no valid completion, else t."
929 (let* ((buffer-string (buffer-string))
930 (completion (try-completion buffer-string
931 minibuffer-completion-table
932 minibuffer-completion-predicate))
933 (status (minibuffer-do-completion-1 buffer-string completion)))
934 (cond ((eq status 'none)
935 (ding nil 'no-completion)
936 (temp-minibuffer-message " [No match]")
939 ;; New message, only in this new Lisp code
940 (temp-minibuffer-message " [Sole completion]")
943 (cond ((or (eq status 'uncompleted)
945 (let ((foo #'(lambda (s)
948 (concat buffer-string s)
949 minibuffer-completion-table
950 minibuffer-completion-predicate)
952 (goto-char (point-max))
957 (char last-command-char))
958 ;; Try to complete by adding a word-delimiter
959 (or (and (characterp char) (> char 0)
960 (funcall foo (char-to-string char)))
961 (and (not (eq char ?\ ))
963 (and (not (eq char ?\-))
966 (if completion-auto-help
967 (minibuffer-completion-help)
968 ;; New message, only in this new Lisp code
969 ;; rewritten for I18N3 snarfing
970 (if (eq status 'exact)
971 (temp-minibuffer-message
972 " [Complete, but not unique]")
973 (temp-minibuffer-message " [Ambiguous]")))
978 ;; First word-break in stuff found by completion
979 (goto-char (point-min))
980 (let ((len (length buffer-string))
982 (if (and (< len (length completion))
987 (upcase (aref buffer-string n))
988 (upcase (aref completion n)))
993 (goto-char (point-min))
995 (re-search-forward "\\W" nil t)))
996 (delete-region (point) (point-max))
997 (goto-char (point-max))))
1001 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1002 ;;;; "Smart minibuffer" hackery ;;;;
1003 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1005 ;;; ("Kludgy minibuffer hackery" is perhaps a better name)
1007 ;; This works by setting `mouse-grabbed-buffer' to the minibuffer,
1008 ;; defining button2 in the minibuffer keymap to
1009 ;; `minibuffer-smart-select-highlighted-completion', and setting the
1010 ;; mode-motion-hook of the minibuffer to `minibuffer-mouse-tracker'.
1011 ;; By setting `mouse-grabbed-buffer', the minibuffer's keymap and
1012 ;; mode-motion-hook apply (for mouse motion and presses) no matter
1013 ;; what buffer the mouse is over. Then, `minibuffer-mouse-tracker'
1014 ;; examines the text under the mouse looking for something that looks
1015 ;; like a completion, and causes it to be highlighted, and
1016 ;; `minibuffer-smart-select-highlighted-completion' looks for a
1017 ;; flagged completion under the mouse and inserts it. This has the
1018 ;; following advantages:
1020 ;; -- filenames and such in any buffer can be inserted by clicking,
1021 ;; not just completions
1023 ;; but the following disadvantages:
1025 ;; -- unless you're aware of the "filename in any buffer" feature,
1026 ;; the fact that strings in arbitrary buffers get highlighted appears
1028 ;; -- mouse motion can cause ange-ftp actions -- bad bad bad.
1030 ;; There's some hackery in minibuffer-mouse-tracker to try to avoid the
1031 ;; ange-ftp stuff, but it doesn't work.
1034 (defcustom minibuffer-smart-completion-tracking-behavior nil
1035 "*If non-nil, look for completions under mouse in all buffers.
1036 This allows you to click on something that looks like a completion
1037 and have it selected, regardless of what buffer it is in.
1039 This is not enabled by default because
1041 -- The \"mysterious\" highlighting in normal buffers is confusing to
1042 people not expecting it, and looks like a bug
1043 -- If ange-ftp is enabled, this tracking sometimes causes ange-ftp
1044 action as a result of mouse motion, which is *bad bad bad*.
1045 Hopefully this bug will be fixed at some point."
1049 (defun minibuffer-smart-mouse-tracker (event)
1050 ;; Used as the mode-motion-hook of the minibuffer window, which is the
1051 ;; value of `mouse-grabbed-buffer' while the minibuffer is active. If
1052 ;; the word under the mouse is a valid minibuffer completion, then it
1055 ;; We do some special voodoo when we're reading a pathname, because
1056 ;; the way filename completion works is funny. Possibly there's some
1057 ;; more general way this could be dealt with...
1059 ;; We do some further voodoo when reading a pathname that is an
1060 ;; ange-ftp or efs path, because causing FTP activity as a result of
1061 ;; mouse motion is a really bad time.
1063 (and minibuffer-smart-completion-tracking-behavior
1065 ;; avoid conflict with display-completion-list extents
1066 (not (extent-at (event-point event)
1067 (event-buffer event)
1069 (let ((filename-kludge-p (eq minibuffer-completion-table
1070 'read-file-name-internal)))
1071 (mode-motion-highlight-internal
1073 #'(lambda () (default-mouse-track-beginning-of-word
1074 (if filename-kludge-p 'nonwhite t)))
1078 (default-mouse-track-end-of-word
1079 (if filename-kludge-p 'nonwhite t))
1080 (if (and (/= p (point)) minibuffer-completion-table)
1081 (setq string (buffer-substring p (point))))
1082 (if (string-match "\\`[ \t\n]*\\'" string)
1084 (if filename-kludge-p
1085 (setq string (minibuffer-smart-select-kludge-filename
1087 ;; try-completion bogusly returns a string even when
1088 ;; that string is complete if that string is also a
1089 ;; prefix for other completions. This means that we
1090 ;; can't just do the obvious thing, (eq t
1091 ;; (try-completion ...)).
1093 (if (and filename-kludge-p
1094 ;; #### evil evil evil evil
1095 (or (and (fboundp 'ange-ftp-ftp-path)
1096 (ange-ftp-ftp-path string))
1097 (and (fboundp 'efs-ftp-path)
1098 (efs-ftp-path string))))
1101 (try-completion string
1102 minibuffer-completion-table
1103 minibuffer-completion-predicate)))
1105 (and (equal comp string)
1106 (or (null minibuffer-completion-predicate)
1108 minibuffer-completion-predicate) ; ???
1109 (funcall minibuffer-completion-predicate
1111 minibuffer-completion-table)
1114 minibuffer-completion-table)
1116 (goto-char p))))))))))
1118 (defun minibuffer-smart-select-kludge-filename (string)
1120 (set-buffer mouse-grabbed-buffer) ; the minibuf
1121 (let ((kludge-string (concat (buffer-string) string)))
1122 (if (or (and (fboundp 'ange-ftp-ftp-path)
1123 (ange-ftp-ftp-path kludge-string))
1124 (and (fboundp 'efs-ftp-path) (efs-ftp-path kludge-string)))
1125 ;; #### evil evil evil, but more so.
1127 (append-expand-filename (buffer-string) string)))))
1129 (defun minibuffer-smart-select-highlighted-completion (event)
1130 "Select the highlighted text under the mouse as a minibuffer response.
1131 When the minibuffer is being used to prompt the user for a completion,
1132 any valid completions which are visible on the frame will highlight
1133 when the mouse moves over them. Clicking \\<minibuffer-local-map>\
1134 \\[minibuffer-smart-select-highlighted-completion] will select the
1135 highlighted completion under the mouse.
1137 If the mouse is clicked while not over a highlighted completion,
1138 then the global binding of \\[minibuffer-smart-select-highlighted-completion] \
1139 will be executed instead. In this\nway you can get at the normal global \
1140 behavior of \\[minibuffer-smart-select-highlighted-completion] as well as
1141 the special minibuffer behavior."
1143 (if minibuffer-smart-completion-tracking-behavior
1144 (minibuffer-smart-select-highlighted-completion-1 event t)
1145 (let ((command (lookup-key global-map
1146 (vector current-mouse-event))))
1147 (if command (call-interactively command)))))
1149 (defun minibuffer-smart-select-highlighted-completion-1 (event global-p)
1150 (let* ((filename-kludge-p (eq minibuffer-completion-table
1151 'read-file-name-internal))
1154 (evpoint (event-point event))
1155 (evextent (and evpoint (extent-at evpoint (event-buffer event)
1158 ;; avoid conflict with display-completion-list extents.
1159 ;; if we find one, do that behavior instead.
1160 (list-mode-item-selected-1 evextent event)
1162 (let* ((buffer (window-buffer (event-window event)))
1163 (p (event-point event))
1164 (extent (and p (extent-at p buffer 'mouse-face))))
1166 (if (not (and (extent-live-p extent)
1167 (eq (extent-object extent) (current-buffer))
1168 (not (extent-detached-p extent))))
1170 ;; ...else user has selected a highlighted completion.
1172 (buffer-substring (extent-start-position extent)
1173 (extent-end-position extent)))
1174 (if filename-kludge-p
1175 (setq completion (minibuffer-smart-select-kludge-filename
1177 ;; remove the extent so that it's not hanging around in
1179 (detach-extent extent)
1180 (set-buffer mouse-grabbed-buffer)
1182 (insert completion))))
1183 ;; we need to execute the command or do the throw outside of the
1185 (cond ((and command-p global-p)
1186 (let ((command (lookup-key global-map
1187 (vector current-mouse-event))))
1189 (call-interactively command)
1190 (if minibuffer-completion-table
1192 "Highlighted words are valid completions. You may select one.")
1193 (error "no completions")))))
1195 ;; things get confused if the minibuffer is terminated while
1197 (select-window (minibuffer-window))
1198 (if (and filename-kludge-p (file-directory-p completion))
1199 ;; if the user clicked middle on a directory name, display the
1200 ;; files in that directory.
1202 (goto-char (point-max))
1203 (minibuffer-completion-help))
1204 ;; otherwise, terminate input
1205 (throw 'exit nil)))))))
1207 (defun minibuffer-smart-maybe-select-highlighted-completion
1208 (event &optional click-count)
1209 "Like minibuffer-smart-select-highlighted-completion but does nothing if
1210 there is no completion (as opposed to executing the global binding). Useful
1211 as the value of `mouse-track-click-hook'."
1213 (minibuffer-smart-select-highlighted-completion-1 event nil))
1215 (define-key minibuffer-local-map 'button2
1216 'minibuffer-smart-select-highlighted-completion)
1219 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1220 ;;;; Minibuffer History ;;;;
1221 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1223 (defvar minibuffer-history '()
1224 "Default minibuffer history list.
1225 This is used for all minibuffer input except when an alternate history
1226 list is specified.")
1228 ;; Some other history lists:
1230 (defvar minibuffer-history-search-history '())
1231 (defvar function-history '())
1232 (defvar variable-history '())
1233 (defvar buffer-history '())
1234 (defvar shell-command-history '())
1235 (defvar file-name-history '())
1237 (defvar read-expression-history nil)
1239 (defvar minibuffer-history-sexp-flag nil ;weird FSF Emacs kludge
1240 "Non-nil when doing history operations on `command-history'.
1241 More generally, indicates that the history list being acted on
1242 contains expressions rather than strings.")
1244 (defun previous-matching-history-element (regexp n)
1245 "Find the previous history element that matches REGEXP.
1246 \(Previous history elements refer to earlier actions.)
1247 With prefix argument N, search for Nth previous match.
1248 If N is negative, find the next or Nth next match."
1250 (let ((enable-recursive-minibuffers t)
1251 (minibuffer-history-sexp-flag nil))
1252 (if (eq 't (symbol-value minibuffer-history-variable))
1253 (error "History is not being recorded in this context"))
1254 (list (read-from-minibuffer "Previous element matching (regexp): "
1255 (car minibuffer-history-search-history)
1256 minibuffer-local-map
1258 'minibuffer-history-search-history)
1259 (prefix-numeric-value current-prefix-arg))))
1260 (let ((history (symbol-value minibuffer-history-variable))
1262 (pos minibuffer-history-position))
1264 (error "History is not being recorded in this context"))
1267 (setq pos (min (max 1 (+ pos (if (< n 0) -1 1))) (length history)))
1269 (if (= pos 1) ;; rewritten for I18N3 snarfing
1270 (error "No later matching history item")
1271 (error "No earlier matching history item")))
1272 (if (string-match regexp
1273 (if minibuffer-history-sexp-flag
1274 (let ((print-level nil))
1275 (prin1-to-string (nth (1- pos) history)))
1276 (nth (1- pos) history)))
1277 (setq n (+ n (if (< n 0) 1 -1)))))
1278 (setq minibuffer-history-position pos)
1279 (setq current-minibuffer-contents (buffer-string)
1280 current-minibuffer-point (point))
1282 (let ((elt (nth (1- pos) history)))
1283 (insert (if minibuffer-history-sexp-flag
1284 (let ((print-level nil))
1285 (prin1-to-string elt))
1287 (goto-char (point-min)))
1288 (if (or (eq (car (car command-history)) 'previous-matching-history-element)
1289 (eq (car (car command-history)) 'next-matching-history-element))
1290 (setq command-history (cdr command-history))))
1292 (defun next-matching-history-element (regexp n)
1293 "Find the next history element that matches REGEXP.
1294 \(The next history element refers to a more recent action.)
1295 With prefix argument N, search for Nth next match.
1296 If N is negative, find the previous or Nth previous match."
1298 (let ((enable-recursive-minibuffers t)
1299 (minibuffer-history-sexp-flag nil))
1300 (if (eq t (symbol-value minibuffer-history-variable))
1301 (error "History is not being recorded in this context"))
1302 (list (read-from-minibuffer "Next element matching (regexp): "
1303 (car minibuffer-history-search-history)
1304 minibuffer-local-map
1306 'minibuffer-history-search-history)
1307 (prefix-numeric-value current-prefix-arg))))
1308 (previous-matching-history-element regexp (- n)))
1310 (defun next-history-element (n)
1311 "Insert the next element of the minibuffer history into the minibuffer."
1313 (if (eq 't (symbol-value minibuffer-history-variable))
1314 (error "History is not being recorded in this context"))
1316 (when (eq minibuffer-history-position
1317 initial-minibuffer-history-position)
1318 (setq current-minibuffer-contents (buffer-string)
1319 current-minibuffer-point (point)))
1320 (let ((narg (- minibuffer-history-position n))
1321 (minimum (if minibuffer-default -1 0)))
1322 (cond ((< narg minimum)
1323 (error "No following item in %s" minibuffer-history-variable))
1324 ((> narg (length (symbol-value minibuffer-history-variable)))
1325 (error "No preceding item in %s" minibuffer-history-variable)))
1327 (setq minibuffer-history-position narg)
1328 (if (eq narg initial-minibuffer-history-position)
1330 (insert current-minibuffer-contents)
1331 (goto-char current-minibuffer-point))
1332 (let ((elt (if (>= narg 0)
1333 (nth (1- minibuffer-history-position)
1334 (symbol-value minibuffer-history-variable))
1335 minibuffer-default)))
1337 (if (not (stringp elt))
1338 (let ((print-level nil))
1340 (let ((print-readably t)
1341 (print-escape-newlines t))
1342 (prin1-to-string elt))
1343 (error (prin1-to-string elt))))
1345 ;; FSF has point-min here.
1346 (goto-char (point-max))))))
1348 (defun previous-history-element (n)
1349 "Insert the previous element of the minibuffer history into the minibuffer."
1351 (next-history-element (- n)))
1353 (defun next-complete-history-element (n)
1354 "Get next element of history which is a completion of minibuffer contents."
1356 (let ((point-at-start (point)))
1357 (next-matching-history-element
1358 (concat "^" (regexp-quote (buffer-substring (point-min) (point)))) n)
1359 ;; next-matching-history-element always puts us at (point-min).
1360 ;; Move to the position we were at before changing the buffer contents.
1361 ;; This is still sensical, because the text before point has not changed.
1362 (goto-char point-at-start)))
1364 (defun previous-complete-history-element (n)
1365 "Get previous element of history which is a completion of minibuffer contents."
1367 (next-complete-history-element (- n)))
1370 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1371 ;;;; reading various things from a minibuffer ;;;;
1372 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1374 (defun read-expression (prompt &optional initial-contents history)
1375 "Return a Lisp object read using the minibuffer.
1376 Prompt with PROMPT. If non-nil, optional second arg INITIAL-CONTENTS
1377 is a string to insert in the minibuffer before reading.
1378 Third arg HISTORY, if non-nil, specifies a history list."
1379 (let ((minibuffer-history-sexp-flag t)
1380 ;; Semi-kludge to get around M-x C-x o M-ESC trying to do completion.
1381 (minibuffer-completion-table nil))
1382 (read-from-minibuffer prompt
1386 (or history 'read-expression-history)
1387 lisp-mode-abbrev-table)))
1389 (defun read-string (prompt &optional initial-contents history)
1390 "Return a string from the minibuffer, prompting with string PROMPT.
1391 If non-nil, optional second arg INITIAL-CONTENTS is a string to insert
1392 in the minibuffer before reading.
1393 Third arg HISTORY, if non-nil, specifies a history list."
1394 (let ((minibuffer-completion-table nil))
1395 (read-from-minibuffer prompt
1397 minibuffer-local-map
1400 (defun eval-minibuffer (prompt &optional initial-contents history)
1401 "Return value of Lisp expression read using the minibuffer.
1402 Prompt with PROMPT. If non-nil, optional second arg INITIAL-CONTENTS
1403 is a string to insert in the minibuffer before reading.
1404 Third arg HISTORY, if non-nil, specifies a history list."
1405 (eval (read-expression prompt initial-contents history)))
1407 ;; The name `command-history' is already taken
1408 (defvar read-command-history '())
1410 (defun read-command (prompt)
1411 "Read the name of a command and return as a symbol.
1412 Prompts with PROMPT."
1413 (intern (completing-read prompt obarray 'commandp t nil
1414 ;; 'command-history is not right here: that's a
1415 ;; list of evalable forms, not a history list.
1416 'read-command-history
1419 (defun read-function (prompt)
1420 "Read the name of a function and return as a symbol.
1421 Prompts with PROMPT."
1422 (intern (completing-read prompt obarray 'fboundp t nil
1423 'function-history)))
1425 (defun read-variable (prompt)
1426 "Read the name of a user variable and return it as a symbol.
1427 Prompts with PROMPT.
1428 A user variable is one whose documentation starts with a `*' character."
1429 (intern (completing-read prompt obarray 'user-variable-p t nil
1430 'variable-history)))
1432 (defun read-buffer (prompt &optional default require-match)
1433 "Read the name of a buffer and return as a string.
1434 Prompts with PROMPT. Optional second arg DEFAULT is value to return if user
1435 enters an empty line. If optional third arg REQUIRE-MATCH is non-nil,
1436 only existing buffer names are allowed."
1437 (let ((prompt (if default
1438 (format "%s(default %s) "
1439 (gettext prompt) (if (bufferp default)
1440 (buffer-name default)
1443 (alist (mapcar #'(lambda (b) (cons (buffer-name b) b))
1447 (setq result (completing-read prompt alist nil require-match
1449 (if (bufferp default)
1450 (buffer-name default)
1452 (cond ((not (equal result ""))
1454 ((not require-match)
1455 (setq result default)
1459 ((not (get-buffer default))
1462 (setq result default)
1464 (if (bufferp result)
1465 (buffer-name result)
1468 (defun read-number (prompt &optional integers-only)
1469 "Read a number from the minibuffer."
1470 (let ((pred (if integers-only 'integerp 'numberp))
1472 (while (not (funcall pred num))
1473 (setq num (condition-case ()
1474 (let ((minibuffer-completion-table nil))
1475 (read-from-minibuffer
1476 prompt (if num (prin1-to-string num)) nil t
1479 (invalid-read-syntax nil)
1481 (or (funcall pred num) (beep)))
1484 (defun read-shell-command (prompt &optional initial-input history)
1485 "Just like read-string, but uses read-shell-command-map:
1486 \\{read-shell-command-map}"
1487 (let ((minibuffer-completion-table nil))
1488 (read-from-minibuffer prompt initial-input read-shell-command-map
1489 nil (or history 'shell-command-history))))
1492 ;;; This read-file-name stuff probably belongs in files.el
1494 ;; Quote "$" as "$$" to get it past substitute-in-file-name
1495 (defun un-substitute-in-file-name (string)
1496 (let ((regexp "\\$")
1497 (olen (length string))
1500 (if (not (string-match regexp string))
1503 (while (string-match regexp string (match-end 0))
1505 (setq new (make-string (+ olen n) ?$))
1508 (setq ch (aref string o))
1510 (setq o (1+ o) n (1+ n))
1512 ;; already aset by make-string initial-value
1516 (defun read-file-name-2 (history prompt dir default
1517 must-match initial-contents
1520 (setq dir default-directory))
1521 (setq dir (abbreviate-file-name dir t))
1522 (let* ((insert (cond ((and (not insert-default-directory)
1523 (not initial-contents))
1526 (cons (un-substitute-in-file-name
1527 (concat dir initial-contents))
1530 (un-substitute-in-file-name dir))))
1532 ;; Hateful, broken, case-sensitive un*x
1533 ;;; (completing-read prompt
1539 ;; #### - this is essentially the guts of completing read.
1540 ;; There should be an elegant way to pass a pair of keymaps to
1541 ;; completing read, but this will do for now. All sins are
1543 (let ((minibuffer-completion-table completer)
1544 (minibuffer-completion-predicate dir)
1545 (minibuffer-completion-confirm (if (eq must-match 't)
1547 (last-exact-completion nil))
1548 (read-from-minibuffer prompt
1550 (if (not must-match)
1552 read-file-name-must-match-map)
1557 ;;; ;; Kludge! Put "/foo/bar" on history rather than "/default//foo/bar"
1558 ;;; (let ((hist (cond ((not history) 'minibuffer-history)
1559 ;;; ((consp history) (car history))
1563 ;;; (not (eq hist 't))
1565 ;;; (equal (car-safe (symbol-value hist)) val))
1566 ;;; (let ((e (condition-case nil
1567 ;;; (expand-file-name val)
1569 ;;; (if (and e (not (equal e val)))
1570 ;;; (set hist (cons e (cdr (symbol-value hist))))))))
1573 (error "No file name specified"))
1575 (equal val (if (consp insert) (car insert) insert)))
1578 (substitute-in-file-name val)))))
1580 ;; #### this function should use minibuffer-completion-table
1581 ;; or something. But that is sloooooow.
1582 ;; #### all this shit needs better documentation!!!!!!!!
1583 (defun read-file-name-activate-callback (event extent dir-p)
1584 ;; used as the activate-callback of the filename list items
1585 ;; in the completion buffer, in place of default-choose-completion.
1586 ;; if a regular file was selected, we call default-choose-completion
1587 ;; (which just inserts the string in the minibuffer and calls
1588 ;; exit-minibuffer). If a directory was selected, we display
1589 ;; the contents of the directory.
1590 (let* ((file (extent-string extent))
1591 (completion-buf (extent-object extent))
1592 (minibuf (symbol-value-in-buffer 'completion-reference-buffer
1594 (in-dir (file-name-directory (buffer-substring nil nil minibuf)))
1595 (full (expand-file-name file in-dir)))
1596 (if (not (file-directory-p full))
1597 (default-choose-completion event extent minibuf)
1598 (erase-buffer minibuf)
1599 (insert-string (file-name-as-directory
1600 (abbreviate-file-name full t)) minibuf)
1601 (reset-buffer completion-buf)
1602 (let ((standard-output completion-buf))
1603 (display-completion-list
1604 (delete "." (directory-files full nil nil nil (if dir-p 'directory)))
1606 :reference-buffer minibuf
1607 :activate-callback 'read-file-name-activate-callback)
1608 (goto-char (point-min) completion-buf)))))
1610 (defun read-file-name-1 (history prompt dir default
1611 must-match initial-contents
1613 (if (should-use-dialog-box-p)
1614 ;; this calls read-file-name-2
1615 (mouse-read-file-name-1 history prompt dir default must-match
1616 initial-contents completer)
1619 ;; #### SCREAM! Create a `file-system-ignore-case'
1620 ;; function, so this kind of stuff is generalized!
1621 (and (eq system-type 'windows-nt)
1622 (set (make-local-variable 'completion-ignore-case) t))
1624 (make-local-variable
1625 'completion-display-completion-list-function)
1626 #'(lambda (completions)
1627 (display-completion-list
1629 :user-data (not (eq completer 'read-file-name-internal))
1631 'read-file-name-activate-callback)))
1633 (remove-hook 'minibuffer-setup-hook rfhookfun)
1637 (add-hook 'minibuffer-setup-hook rfhookfun)
1638 (read-file-name-2 history prompt dir default must-match
1639 initial-contents completer))
1640 (remove-hook 'minibuffer-setup-hook rfhookfun)))))
1642 (defun read-file-name (prompt
1643 &optional dir default must-match initial-contents
1645 "Read file name, prompting with PROMPT and completing in directory DIR.
1646 This will prompt with a dialog box if appropriate, according to
1647 `should-use-dialog-box-p'.
1648 Value is not expanded---you must call `expand-file-name' yourself.
1649 Value is subject to interpreted by substitute-in-file-name however.
1650 Default name to DEFAULT if user enters a null string.
1651 (If DEFAULT is omitted, the visited file name is used,
1652 except that if INITIAL-CONTENTS is specified, that combined with DIR is
1654 Fourth arg MUST-MATCH non-nil means require existing file's name.
1655 Non-nil and non-t means also require confirmation after completion.
1656 Fifth arg INITIAL-CONTENTS specifies text to start with.
1657 Sixth arg HISTORY specifies the history list to use. Default is
1658 `file-name-history'.
1659 DIR defaults to current buffer's directory default."
1661 (or history 'file-name-history)
1662 prompt dir (or default
1663 (if initial-contents (expand-file-name initial-contents dir)
1665 must-match initial-contents
1666 ;; A separate function (not an anonymous lambda-expression)
1667 ;; and passed as a symbol because of disgusting kludges in various
1668 ;; places which do stuff like (let ((filename-kludge-p (eq minibuffer-completion-table 'read-file-name-internal))) ...)
1669 'read-file-name-internal))
1671 (defun read-directory-name (prompt
1672 &optional dir default must-match initial-contents
1674 "Read directory name, prompting with PROMPT and completing in directory DIR.
1675 This will prompt with a dialog box if appropriate, according to
1676 `should-use-dialog-box-p'.
1677 Value is not expanded---you must call `expand-file-name' yourself.
1678 Value is subject to interpreted by substitute-in-file-name however.
1679 Default name to DEFAULT if user enters a null string.
1680 (If DEFAULT is omitted, the current buffer's default directory is used.)
1681 Fourth arg MUST-MATCH non-nil means require existing directory's name.
1682 Non-nil and non-t means also require confirmation after completion.
1683 Fifth arg INITIAL-CONTENTS specifies text to start with.
1684 Sixth arg HISTORY specifies the history list to use. Default is
1685 `file-name-history'.
1686 DIR defaults to current buffer's directory default."
1688 (or history 'file-name-history)
1689 prompt dir (or default default-directory) must-match initial-contents
1690 'read-directory-name-internal))
1693 ;; Environment-variable and ~username completion hack
1694 (defun read-file-name-internal-1 (string dir action completer)
1695 (if (not (string-match
1696 "\\([^$]\\|\\`\\)\\(\\$\\$\\)*\\$\\([A-Za-z0-9_]*\\|{[^}]*\\)\\'"
1698 ;; Not doing environment-variable completion hack
1699 (let* ((orig (if (equal string "") nil string))
1700 (sstring (if orig (substitute-in-file-name string) string))
1701 (specdir (if orig (file-name-directory sstring) nil))
1702 (name (if orig (file-name-nondirectory sstring) string))
1703 (direct (if specdir (expand-file-name specdir dir) dir)))
1704 ;; ~username completion
1705 (if (and (fboundp 'user-name-completion-1)
1706 (string-match "^[~]" name))
1707 (let ((user (substring name 1)))
1708 (cond ((eq action 'lambda)
1709 (file-directory-p name))
1712 (mapcar #'(lambda (p) (concat "~" p))
1713 (user-name-all-completions user)))
1716 (let* ((val+uniq (user-name-completion-1 user))
1717 (val (car val+uniq))
1718 (uniq (cdr val+uniq)))
1719 (cond ((stringp val)
1721 (file-name-as-directory (concat "~" val))
1724 (file-name-as-directory name))
1733 ;; An odd number of trailing $'s
1734 (let* ((start (match-beginning 3))
1735 (env (substring string
1736 (cond ((= start (length string))
1739 ((= (aref string start) ?{)
1744 (head (substring string 0 (1- start)))
1746 (mapcar #'(lambda (x)
1747 (cons (substring x 0 (string-match "=" x))
1749 process-environment))))
1751 (cond ((eq action 'lambda)
1755 (mapcar #'(lambda (p)
1756 (if (and (> (length p) 0)
1757 ;;#### Unix-specific
1758 ;;#### -- need absolute-pathname-p
1761 (concat head "$" p)))
1762 (all-completions env (funcall alist))))
1765 (let* ((e (funcall alist))
1766 (val (try-completion env e)))
1767 (cond ((stringp val)
1768 (if (string-match "[^A-Za-z0-9_]" val)
1771 ;; completed uniquely?
1772 (if (eq (try-completion val e) 't)
1774 (concat head "$" val)))
1777 (un-substitute-in-file-name (getenv env))))
1781 (defun read-file-name-internal (string dir action)
1782 (read-file-name-internal-1
1784 #'(lambda (action orig string specdir dir name)
1785 (cond ((eq action 'lambda)
1788 (let ((sstring (condition-case nil
1789 (expand-file-name string)
1792 ;; Some pathname syntax error in string
1794 (file-exists-p sstring)))))
1797 (mapcar #'un-substitute-in-file-name
1798 (file-name-all-completions name dir)))
1801 (let* ((d (or dir default-directory))
1802 (val (file-name-completion name d)))
1803 (if (and (eq val 't)
1804 (not (null completion-ignored-extensions)))
1805 ;;#### (file-name-completion "foo") returns 't
1806 ;; when both "foo" and "foo~" exist and the latter
1807 ;; is "pruned" by completion-ignored-extensions.
1808 ;; I think this is a bug in file-name-completion.
1809 (setq val (let ((completion-ignored-extensions '()))
1810 (file-name-completion name d))))
1812 (un-substitute-in-file-name (if specdir
1813 (concat specdir val)
1815 (let ((tem (un-substitute-in-file-name string)))
1816 (if (not (equal tem orig))
1817 ;; substitute-in-file-name did something
1821 (defun read-directory-name-internal (string dir action)
1822 (read-file-name-internal-1
1824 #'(lambda (action orig string specdir dir name)
1825 (let* ((dirs #'(lambda (fn)
1826 (let ((l (if (equal name "")
1836 (concat "\\`" (regexp-quote name))
1842 (cond ((eq action 'lambda)
1846 (file-directory-p string)))
1849 (funcall dirs #'(lambda (n)
1850 (un-substitute-in-file-name
1851 (file-name-as-directory n)))))
1854 (let ((val (try-completion
1858 (list (file-name-as-directory
1861 (un-substitute-in-file-name (if specdir
1862 (concat specdir val)
1864 (let ((tem (un-substitute-in-file-name string)))
1865 (if (not (equal tem orig))
1866 ;; substitute-in-file-name did something
1870 (defun append-expand-filename (file-string string)
1871 "Append STRING to FILE-STRING differently depending on whether STRING
1872 is a username (~string), an environment variable ($string),
1873 or a filename (/string). The resultant string is returned with the
1874 environment variable or username expanded and resolved to indicate
1875 whether it is a file(/result) or a directory (/result/)."
1877 (cond ((string-match "\\([~$]\\)\\([^~$/]*\\)$" file-string)
1878 (cond ((string= (substring file-string
1881 (concat (substring file-string 0 (match-end 1))
1883 (t (substitute-in-file-name
1884 (concat (substring file-string 0 (match-end 1))
1886 (t (concat (file-name-directory
1887 (substitute-in-file-name file-string)) string))))
1890 (cond ((stringp (setq result (and (file-exists-p (expand-file-name file))
1891 (read-file-name-internal
1893 (expand-file-name file)
1899 (defun mouse-file-display-completion-list (window dir minibuf user-data)
1900 (let ((standard-output (window-buffer window)))
1902 (display-completion-list
1903 (directory-files dir nil nil nil t)
1904 :window-width (* 2 (window-width window))
1906 'mouse-read-file-name-activate-callback
1907 :user-data user-data
1908 :reference-buffer minibuf
1912 (defun mouse-directory-display-completion-list (window dir minibuf user-data)
1913 (let ((standard-output (window-buffer window)))
1915 (display-completion-list
1916 (delete "." (directory-files dir nil nil nil 1))
1917 :window-width (window-width window)
1919 'mouse-read-file-name-activate-callback
1920 :user-data user-data
1921 :reference-buffer minibuf
1925 (defun mouse-read-file-name-activate-callback (event extent user-data)
1926 (let* ((file (extent-string extent))
1927 (minibuf (symbol-value-in-buffer 'completion-reference-buffer
1928 (extent-object extent)))
1929 (in-dir (buffer-substring nil nil minibuf))
1930 (full (expand-file-name file in-dir))
1931 (filebuf (nth 0 user-data))
1932 (dirbuff (nth 1 user-data))
1933 (filewin (nth 2 user-data))
1934 (dirwin (nth 3 user-data)))
1935 (if (file-regular-p full)
1936 (default-choose-completion event extent minibuf)
1937 (erase-buffer minibuf)
1938 (insert-string (file-name-as-directory
1939 (abbreviate-file-name full t)) minibuf)
1940 (reset-buffer filebuf)
1942 (mouse-directory-display-completion-list filewin full minibuf
1944 (mouse-file-display-completion-list filewin full minibuf user-data)
1945 (reset-buffer dirbuff)
1946 (mouse-directory-display-completion-list dirwin full minibuf
1949 ;; this is rather cheesified but gets the job done.
1950 (defun mouse-read-file-name-1 (history prompt dir default
1951 must-match initial-contents
1953 (let* ((file-p (eq 'read-file-name-internal completer))
1954 (filebuf (get-buffer-create "*Completions*"))
1955 (dirbuff (and file-p (generate-new-buffer " *mouse-read-file*")))
1956 (butbuff (generate-new-buffer " *mouse-read-file*"))
1957 (frame (make-dialog-frame))
1962 (reset-buffer filebuf)
1963 (select-frame frame)
1964 (let ((window-min-height 1))
1965 ;; #### should be 2 not 3, but that causes
1966 ;; "window too small to split" errors for some
1967 ;; people (but not for me ...) There's a more
1968 ;; fundamental bug somewhere.
1969 (split-window nil (- (frame-height frame) 3)))
1972 (split-window-horizontally 16)
1973 (setq filewin (frame-rightmost-window frame)
1974 dirwin (frame-leftmost-window frame))
1975 (set-window-buffer filewin filebuf)
1976 (set-window-buffer dirwin dirbuff))
1977 (setq filewin (frame-highest-window frame))
1978 (set-window-buffer filewin filebuf))
1979 (setq user-data (list filebuf dirbuff filewin dirwin))
1980 (set-window-buffer (frame-lowest-window frame) butbuff)
1981 (set-buffer butbuff)
1983 (setq default-directory dir))
1984 (when (featurep 'scrollbar)
1985 (set-specifier scrollbar-width 0 butbuff))
1987 (insert-gui-button (make-gui-button "OK"
1989 (exit-minibuffer))))
1991 (insert-gui-button (make-gui-button "Cancel"
1993 (abort-recursive-edit))))
1997 (mouse-directory-display-completion-list
1998 filewin dir (current-buffer) user-data)
1999 (mouse-file-display-completion-list filewin dir
2002 (mouse-directory-display-completion-list dirwin dir
2006 (make-local-variable
2007 'completion-display-completion-list-function)
2008 #'(lambda (completions)
2009 (display-completion-list
2013 'mouse-read-file-name-activate-callback
2014 :user-data user-data)))
2016 (remove-hook 'minibuffer-setup-hook rfhookfun)
2020 ;; #### I really need to flesh out the object
2021 ;; hierarchy better to avoid these kludges.
2024 (set-buffer standard-output)
2025 (setq truncate-lines t)))))
2028 (add-hook 'minibuffer-setup-hook rfhookfun)
2029 (add-hook 'completion-setup-hook rfcshookfun)
2030 (read-file-name-2 history prompt dir default
2031 must-match initial-contents
2033 (remove-hook 'minibuffer-setup-hook rfhookfun)
2034 (remove-hook 'completion-setup-hook rfcshookfun))))
2035 (delete-frame frame)
2036 (kill-buffer filebuf)
2037 (kill-buffer butbuff)
2038 (and dirbuff (kill-buffer dirbuff)))))
2040 (defun read-face (prompt &optional must-match)
2041 "Read the name of a face from the minibuffer and return it as a symbol."
2042 (intern (completing-read prompt obarray 'find-face must-match)))
2044 ;; #### - wrong place for this variable? Exactly. We probably want
2045 ;; `color-list' to be a console method, so `tty-color-list' becomes
2046 ;; obsolete, and `read-color-completion-table' conses (mapcar #'list
2047 ;; (color-list)), optionally caching the results.
2049 ;; Ben wanted all of the possibilities from the `configure' script used
2050 ;; here, but I think this is way too many. I already trimmed the R4 variants
2051 ;; and a few obvious losers from the list. --Stig
2052 (defvar x-library-search-path '("/usr/X11R6/lib/X11/"
2053 "/usr/X11R5/lib/X11/"
2054 "/usr/lib/X11R6/X11/"
2055 "/usr/lib/X11R5/X11/"
2056 "/usr/local/X11R6/lib/X11/"
2057 "/usr/local/X11R5/lib/X11/"
2058 "/usr/local/lib/X11R6/X11/"
2059 "/usr/local/lib/X11R5/X11/"
2062 "/usr/local/lib/X11/"
2063 "/usr/X386/lib/X11/"
2064 "/usr/x386/lib/X11/"
2065 "/usr/XFree86/lib/X11/"
2066 "/usr/unsupported/lib/X11/"
2067 "/usr/athena/lib/X11/"
2068 "/usr/local/x11r5/lib/X11/"
2069 "/usr/lpp/Xamples/lib/X11/"
2070 "/usr/openwin/lib/X11/"
2071 "/usr/openwin/share/lib/X11/")
2072 "Search path used by `read-color' to find rgb.txt.")
2074 (defvar x-read-color-completion-table)
2076 (defun read-color-completion-table ()
2078 ;; #### Evil device-type dependency
2080 (if (boundp 'x-read-color-completion-table)
2081 x-read-color-completion-table
2082 (let ((rgb-file (locate-file "rgb.txt" x-library-search-path))
2085 ;; prevents multiple searches for rgb.txt if we can't find it
2086 (setq x-read-color-completion-table nil)
2087 (with-current-buffer (get-buffer-create " *colors*")
2088 (reset-buffer (current-buffer))
2089 (insert-file-contents rgb-file)
2091 ;; skip over comments
2092 (while (looking-at "^!")
2095 (skip-chars-forward "0-9 \t")
2098 (setq color (buffer-substring p (point))
2099 clist (cons (list color) clist))
2100 ;; Ugh. If we want to be able to complete the lowercase form
2101 ;; of the color name, we need to add it twice! Yuck.
2102 (let ((dcase (downcase color)))
2103 (or (string= dcase color)
2104 (push (list dcase) clist)))
2106 (kill-buffer (current-buffer))))
2107 (setq x-read-color-completion-table clist)
2108 x-read-color-completion-table)))
2110 (mapcar #'list (mswindows-color-list)))
2112 (mapcar #'list (tty-color-list)))))
2114 (defun read-color (prompt &optional must-match initial-contents)
2115 "Read the name of a color from the minibuffer.
2116 On X devices, this uses `x-library-search-path' to find rgb.txt in order
2117 to build a completion table.
2118 On TTY devices, this uses `tty-color-list'.
2119 On mswindows devices, this uses `mswindows-color-list'."
2120 (let ((table (read-color-completion-table)))
2121 (completing-read prompt table nil (and table must-match)
2125 ;; #### The doc string for read-non-nil-coding system gets lost if we
2126 ;; only include these if the mule feature is present. Strangely,
2127 ;; read-coding-system doesn't.
2129 ;;(if (featurep 'mule)
2131 (defun read-coding-system (prompt &optional default-coding-system)
2132 "Read a coding-system (or nil) from the minibuffer.
2133 Prompting with string PROMPT.
2134 If the user enters null input, return second argument DEFAULT-CODING-SYSTEM.
2135 DEFAULT-CODING-SYSTEM can be a string, symbol, or coding-system object."
2136 (intern (completing-read prompt obarray 'find-coding-system t nil nil
2137 (cond ((symbolp default-coding-system)
2138 (symbol-name default-coding-system))
2139 ((coding-system-p default-coding-system)
2140 (symbol-name (coding-system-name default-coding-system)))
2142 default-coding-system)))))
2144 (defun read-non-nil-coding-system (prompt)
2145 "Read a non-nil coding-system from the minibuffer.
2146 Prompt with string PROMPT."
2147 (let ((retval (intern "")))
2148 (while (= 0 (length (symbol-name retval)))
2149 (setq retval (intern (completing-read prompt obarray
2154 ;;) ;; end of (featurep 'mule)
2158 (defcustom force-dialog-box-use nil
2159 "*If non-nil, always use a dialog box for asking questions, if possible.
2160 You should *bind* this, not set it. This is useful if you're doing
2161 something mousy but which wasn't actually invoked using the mouse."
2165 ;; We include this here rather than dialog.el so it is defined
2166 ;; even when dialog boxes are not present.
2167 (defun should-use-dialog-box-p ()
2168 "If non-nil, questions should be asked with a dialog box instead of the
2169 minibuffer. This looks at `last-command-event' to see if it was a mouse
2170 event, and checks whether dialog-support exists and the current device
2171 supports dialog boxes.
2173 The dialog box is totally disabled if the variable `use-dialog-box'
2175 (and (featurep 'dialog)
2176 (device-on-window-system-p)
2178 (or force-dialog-box-use
2179 (button-press-event-p last-command-event)
2180 (button-release-event-p last-command-event)
2181 (misc-user-event-p last-command-event))))
2183 ;;; minibuf.el ends here