File: input.lisp

package info (click to toggle)
stumpwm 2:1.0.0-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 1,216 kB
  • sloc: lisp: 13,721; makefile: 180; sh: 30
file content (724 lines) | stat: -rw-r--r-- 31,590 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
;; Copyright (C) 2003-2008 Shawn Betts
;;
;;  This file is part of stumpwm.
;;
;; stumpwm is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

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

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

;; Commentary:
;;
;; This file handles input stuff
;;
;; Code:
(in-package :stumpwm)

(export '(*input-history-ignore-duplicates*
          *input-map*
          *numpad-map*
	  completing-read
	  input-delete-region
	  input-goto-char
	  input-insert-char
	  input-insert-string
	  input-point
	  input-substring
	  input-validate-region
	  read-one-char
	  read-one-line))

(defstruct input-line
  string position history history-bk password)

(defvar *input-map* nil
  "This is the keymap containing all input editing key bindings.")

(when (null *input-map*)
  (setf *input-map*
        (let ((map (make-sparse-keymap)))
          (define-key map (kbd "DEL") 'input-delete-backward-char)
          (define-key map (kbd "M-DEL") 'input-backward-kill-word)
          (define-key map (kbd "C-d") 'input-delete-forward-char)
          (define-key map (kbd "M-d") 'input-forward-kill-word)
          (define-key map (kbd "Delete") 'input-delete-forward-char)
          (define-key map (kbd "C-f") 'input-forward-char)
          (define-key map (kbd "Right") 'input-forward-char)
          (define-key map (kbd "M-f") 'input-forward-word)
          (define-key map (kbd "C-b") 'input-backward-char)
          (define-key map (kbd "Left") 'input-backward-char)
          (define-key map (kbd "M-b") 'input-backward-word)
          (define-key map (kbd "C-a") 'input-move-beginning-of-line)
          (define-key map (kbd "Home") 'input-move-beginning-of-line)
          (define-key map (kbd "C-e") 'input-move-end-of-line)
          (define-key map (kbd "End") 'input-move-end-of-line)
          (define-key map (kbd "C-k") 'input-kill-line)
          (define-key map (kbd "C-u") 'input-kill-to-beginning)
          (define-key map (kbd "C-p") 'input-history-back)
          (define-key map (kbd "Up") 'input-history-back)
          (define-key map (kbd "C-n") 'input-history-forward)
          (define-key map (kbd "Down") 'input-history-forward)
          (define-key map (kbd "RET") 'input-submit)
          (define-key map (kbd "C-g") 'input-abort)
          (define-key map (kbd "ESC") 'input-abort)
          (define-key map (kbd "C-y") 'input-yank-selection)
          (define-key map (kbd "C-Y") 'input-yank-clipboard)
          (define-key map (kbd "TAB") 'input-complete-forward)
          (define-key map (kbd "ISO_Left_Tab") 'input-complete-backward)
          (define-key map t 'input-self-insert)
          map)))

(defvar *input-history* nil
  "History for the input line.")

(defvar *input-last-command* nil
  "The last input command.")

(defvar *input-completions* nil
  "The list of completions")

(defvar *input-current-completions* nil
  "The list of matching completions.")

(defvar *input-current-completions-idx* nil
  "The current index in the current completions list.")

(defvar *input-history-ignore-duplicates* nil
  "Do not add a command to the input history if it's already the first in the list.")
(defvar *numpad-map* '((87 10 . 16) (88  11 . 16) (89 12 . 16) (106 61 . 16)
                       (83 13 . 16) (84  14 . 16) (85 15 . 16) (86  21 . 17)
                       (79 16 . 16) (80  17 . 16) (81 18 . 16) (63  17 . 17) 
                       (82 20 . 16) (104 36 . 16) (91 60 . 16) (90  19 . 16))
  "A keycode to keycode map to re-wire numpads when the numlock key is active")

;;; keysym functions

(defun is-modifier (keycode)
  "Return t if keycode is a modifier"
  (or (find keycode *all-modifiers* :test 'eql)
      ;; Treat No Symbol keys as modifiers (and therefore ignorable)
      (= (xlib:keycode->keysym *display* keycode 0) 0)))

(defun keycode->character (code mods)
  (let ((idx (if (member :shift mods) 1 0)))
    (xlib:keysym->character *display* (xlib:keycode->keysym *display* code idx) 0)))

;;; line and key reading functions

(defun setup-input-window (screen prompt input)
  "Set the input window up to read input"
  (let* ((height (font-height (screen-font screen)))
         (win (screen-input-window screen)))
    ;; Window dimensions
    (xlib:with-state (win)
      (setf (xlib:window-priority win) :above
            (xlib:drawable-height win) height))
    (xlib:map-window win)
    ;; Draw the prompt
    (draw-input-bucket screen prompt input)
    ;; Ready to recieve input
    
))

(defun shutdown-input-window (screen)
  (xlib:ungrab-keyboard *display*)
  (xlib:unmap-window (screen-input-window screen)))
;; Hack to avoid clobbering input from numpads with numlock on.
(defun input-handle-key-press-event (&rest event-slots 
                                     &key event-key root code state 
                                       &allow-other-keys)
  (declare (ignore event-slots root))
  (let ((numlock-on-p (= 2 (logand 2 (nth-value 4 (xlib:keyboard-control *display*)))))
         (numpad-key (assoc code *numpad-map*)))
    (when (and numlock-on-p numpad-key)
      (setf code (first (rest numpad-key))
            state (rest (rest numpad-key))))
    (list* event-key code state)))

(defun input-handle-selection-event (&key window selection property &allow-other-keys)
  (declare (ignore selection))
  (if property
      (xlib:get-property window property :type :string :result-type 'string :transform #'xlib:card8->char :delete-p t)
      ""))

(defun read-key-handle-event (&rest event-slots &key display event-key &allow-other-keys)
  (declare (ignore display))
  (case event-key
    ((or :key-release :key-press)
     (apply 'input-handle-key-press-event event-slots))
    (t nil)))

(defun read-key-or-selection-handle-event (&rest event-slots &key display event-key &allow-other-keys)
  (declare (ignore display))
  (case event-key
    ((or :key-release :key-press)
     (apply 'input-handle-key-press-event event-slots))
    (:selection-notify
     (apply 'input-handle-selection-event event-slots))
    (t nil)))

(defun read-key ()
  "Return a dotted pair (code . state) key."
  (loop for ev = (xlib:process-event *display* :handler #'read-key-handle-event :timeout nil) do
       (when (and (consp ev)
                  (eq (first ev) :key-press))
           (return (rest ev)))))

(defun read-key-no-modifiers ()
  "Like read-key but never returns a modifier key."
  (loop for k = (read-key)
       while (is-modifier (car k))
       finally (return k)))

(defun read-key-or-selection ()
  (loop for ev = (xlib:process-event *display* :handler #'read-key-or-selection-handle-event :timeout nil) do
       (cond ((stringp ev)
              (return ev))
             ((and (consp ev)
                   (eq (first ev) :key-press))
              (return (rest ev))))))

(defun make-input-string (initial-input)
  (make-array (length initial-input) :element-type 'character :initial-contents initial-input
              :adjustable t :fill-pointer t))

(defun completing-read (screen prompt completions &key (initial-input "") require-match)
  "Read a line of input through stumpwm and return it with TAB
completion. completions can be a list, an fbound symbol, or a
function. if its an fbound symbol or a function then that function is
passed the substring to complete on and is expected to return a list
of matches. If require-match argument is non-nil then the input must
match with an element of the completions."
  (check-type completions (or list function symbol))
  (let ((*input-completions* completions)
        (*input-current-completions* nil)
        (*input-current-completions-idx* nil))
    (let ((line (read-one-line screen prompt :initial-input initial-input :require-match require-match)))
      (when line (string-trim " " line)))))

(defun read-one-line (screen prompt &key (initial-input "") require-match password)
  "Read a line of input through stumpwm and return it. returns nil if the user aborted."
  (let ((*input-last-command* nil)
        (input (make-input-line :string (make-input-string initial-input)
                                :position (length initial-input)
                                :history -1
                                :password password)))
    (labels ((match-input ()
               (let* ((in (string-trim " " (input-line-string input)))
                      (compls (input-find-completions in *input-completions*)))
                 (and (consp compls)
                      (string= in (if (consp (car compls))
                                      (caar compls)
                                      (car compls))))))
             (key-loop ()
               (loop for key = (read-key-or-selection) do
                     (cond ((stringp key)
                            ;; handle selection
                            (input-insert-string input key)
                            (draw-input-bucket screen prompt input))
                           ;; skip modifiers
                           ((is-modifier (car key)))
                           ((process-input screen prompt input (car key) (cdr key))
                            (if (or (not require-match)
                                    (match-input))
                                (return (input-line-string input))
                                (draw-input-bucket screen prompt input "[No match]" t)))))))
      (setup-input-window screen prompt input)
      (catch :abort
        (unwind-protect
             (with-focus (screen-input-window screen)
               (key-loop))
          (shutdown-input-window screen))))))

(defun read-one-char (screen)
  "Read a single character from the user."
  (with-focus (screen-key-window screen)
    (let ((k (read-key-no-modifiers)))
      (keycode->character (car k) (xlib:make-state-keys (cdr k))))))


(defun draw-input-bucket (screen prompt input &optional (tail "") errorp)
  "Draw to the screen's input window the contents of input."
  (let* ((gcontext (screen-message-gc screen))
         (win (screen-input-window screen))
         (prompt-width (text-line-width (screen-font screen) prompt :translate #'translate-id))
         (line-content (input-line-string input))
         (string (if (input-line-password input)
                     (make-string (length line-content) :initial-element #\*)
                     line-content))
         (string-width (loop for char across string
                             summing (text-line-width (screen-font screen)
                                                      (string char)
                                                      :translate #'translate-id)))
         (space-width  (text-line-width (screen-font screen) " "    :translate #'translate-id))
         (tail-width   (text-line-width (screen-font screen) tail   :translate #'translate-id))
         (full-string-width (+ string-width space-width))
         (pos (input-line-position input))
         (width (+ prompt-width
                   (max 100 (+ full-string-width space-width tail-width)))))
    (when errorp (rotatef (xlib:gcontext-background gcontext)
                          (xlib:gcontext-foreground gcontext)))
    (xlib:with-state (win)
      (xlib:with-gcontext (gcontext :foreground (xlib:gcontext-background gcontext))
        (xlib:draw-rectangle win gcontext 0 0
                           (xlib:drawable-width win)
                           (xlib:drawable-height win) t))
      (setf (xlib:drawable-width win) (+ width (* *message-window-padding* 2)))
      (setup-win-gravity screen win *input-window-gravity*))
    (xlib:with-state (win)
      (draw-image-glyphs win gcontext (screen-font screen)
                         *message-window-padding*
                         (font-ascent (screen-font screen))
                         prompt
                         :translate #'translate-id
                         :size 16)
      (loop with x = (+ *message-window-padding* prompt-width)
            for char across string
            for i from 0 below (length string)
            for char-width = (text-line-width (screen-font screen) (string char) :translate #'translate-id)
            if (= pos i)
              do (xlib:with-gcontext (gcontext :foreground (xlib:gcontext-background gcontext)
                                               :background (xlib:gcontext-foreground gcontext))
                   (draw-image-glyphs win gcontext (screen-font screen)
                                      x
                                      (font-ascent (screen-font screen))
                                      (string char)
                                      :translate #'translate-id
                                      :size 16))
            else
              do (draw-image-glyphs win gcontext (screen-font screen)
                                    x
                                    (font-ascent (screen-font screen))
                                    (string char)
                                    :translate #'translate-id
                                    :size 16)
            end
            do (incf x char-width)
            finally (when (>= pos (length string))
                      (xlib:with-gcontext (gcontext :foreground (xlib:gcontext-background gcontext)
                                                    :background (xlib:gcontext-foreground gcontext))
                        (draw-image-glyphs win gcontext (screen-font screen)
                                           x
                                           (font-ascent (screen-font screen))
                                           " "
                                           :translate #'translate-id
                                           :size 16))))
         (draw-image-glyphs win gcontext (screen-font screen)
                            (+ *message-window-padding* prompt-width full-string-width space-width)
                            (font-ascent (screen-font screen))
                            tail
                            :translate #'translate-id
                            :size 16))
    (when errorp
      (sleep 0.05)
      (rotatef (xlib:gcontext-background gcontext)
               (xlib:gcontext-foreground gcontext))
      (draw-input-bucket screen prompt input tail))))

(defun code-state->key (code state)
  (let* ((mods    (xlib:make-state-keys state))
         (shift-p (and (find :shift mods) t))
         (altgr-p (and (intersection (modifiers-altgr *modifiers*) mods) t))
         (base    (if altgr-p 2 0))
         (sym     (xlib:keycode->keysym *display* code base))
         (upsym   (xlib:keycode->keysym *display* code (+ base 1))))
    ;; If a keysym has a shift modifier, then use the uppercase keysym
    ;; and remove remove the shift modifier.
    (make-key :keysym (if (and shift-p (not (eql sym upsym)))
                          upsym
                          sym)
              :control (and (find :control mods) t)
              :shift (and shift-p (eql sym upsym))
              :meta (and (intersection mods (modifiers-meta *modifiers*)) t)
              :alt (and (intersection mods (modifiers-alt *modifiers*)) t)
              :hyper (and (intersection mods (modifiers-hyper *modifiers*)) t)
              :super (and (intersection mods (modifiers-super *modifiers*)) t))))


;;; input string utility functions

(defun input-submit (input key)
  (declare (ignore input key))
  :done)

(defun input-abort (input key)
  (declare (ignore input key))
  (throw :abort nil))

(defun input-goto-char (input point)
  "Move the cursor to the specified point in the string"
  (setf (input-line-position input) (min (max 0 point)
                                         (length (input-line-string input)))))

(defun input-insert-string (input string)
  "Insert @var{string} into the input at the current
position. @var{input} must be of type @var{input-line}. Input
functions are passed this structure as their first argument."
  (check-type string string)
  (loop for c across string
	do (input-insert-char input c)))

(defun input-point (input)
  "Return the position of the cursor."
  (check-type input input-line)
  (input-line-position input))

(defun input-validate-region (input start end)
  "Return a value pair of numbers where the first number is < the
second and neither excedes the bounds of the input string."
  (values (max 0 (min start end))
          (min (length (input-line-string input))
               (max start end))))

(defun input-delete-region (input start end)
  "Delete the region between start and end in the input string"
  (check-type input input-line)
  (check-type start fixnum)
  (check-type end fixnum)
  (multiple-value-setq (start end) (input-validate-region input start end))
  (replace (input-line-string input) (input-line-string input)
           :start2 end :start1 start)
  (decf (fill-pointer (input-line-string input)) (- end start))
  (cond
    ((< (input-line-position input) start))
    ((< (input-line-position input) end)
     (setf (input-line-position input) start))
    (t
     (decf (input-line-position input) (- end start)))))

(defun input-insert-char (input char)
  "Insert @var{char} into the input at the current
position. @var{input} must be of type @var{input-line}. Input
functions are passed this structure as their first argument."
  (vector-push-extend #\_ (input-line-string input))
  (replace (input-line-string input) (input-line-string input)
           :start2 (input-line-position input) :start1 (1+ (input-line-position input)))
  (setf (char (input-line-string input) (input-line-position input)) char)
  (incf (input-line-position input)))

(defun input-substring (input start end)
  "Return a the substring in INPUT bounded by START and END."
  (subseq (input-line-string input) start end))


;;; "interactive" input functions

(defun input-find-completions (str completions)
  (if (or (functionp completions)
          (and (symbolp completions)
               (fboundp completions)))
      (funcall completions str)
      (remove-if-not (lambda (elt)
                       (when (listp elt)
                         (setf elt (car elt)))
                       (and (<= (length str) (length elt))
                            (string= str elt
                                     :end1 (length str)
                                     :end2 (length str))))
                     completions)))

(defun input-complete (input direction)
  ;; reset the completion list if this is the first time they're
  ;; trying to complete.
  (unless (find *input-last-command* '(input-complete-forward
                                       input-complete-backward))
    (setf *input-current-completions* (input-find-completions (input-substring input 0 (input-point input)) *input-completions*)
          *input-current-completions-idx* -1))
  (if *input-current-completions*
      (progn
        ;; Insert the next completion
        (input-delete-region input 0 (input-point input))
        (if (eq direction :forward)
            (progn
              (incf *input-current-completions-idx*)
              (when (>= *input-current-completions-idx* (length *input-current-completions*))
                (setf *input-current-completions-idx* 0)))
            (progn
              (decf *input-current-completions-idx*)
              (when (< *input-current-completions-idx* 0)
                (setf *input-current-completions-idx* (1- (length *input-current-completions*))))))
        (let ((elt (nth *input-current-completions-idx* *input-current-completions*)))
          (input-insert-string input (if (listp elt) (first elt) elt))
          (input-insert-char input #\Space)))
      :error))

(defun input-complete-forward (input key)
  (declare (ignore key))
  (input-complete input :forward))

(defun input-complete-backward (input key)
  (declare (ignore key))
  (input-complete input :backward))

(defun input-delete-backward-char (input key)
  (declare (ignore key))
  (let ((pos (input-line-position input)))
    (cond ((or (<= (length (input-line-string input)) 0)
               (<= pos 0))
           :error)
          (t
           (replace (input-line-string input) (input-line-string input)
                    :start2 pos :start1 (1- pos))
           (decf (fill-pointer (input-line-string input)))
           (decf (input-line-position input))))))

(defun input-delete-forward-char (input key)
  (declare (ignore key))
  (let ((pos (input-line-position input)))
    (cond ((>= pos
               (length (input-line-string input)))
           :error)
          (t
           (replace (input-line-string input) (input-line-string input)
                    :start1 pos :start2 (1+ pos))
           (decf (fill-pointer (input-line-string input)))))))

(defun input-forward-kill-word (input key)
  (declare (ignore key))
  (let* ((p1 (position-if 'alphanumericp (input-line-string input) :start (input-line-position input)))
         (p2 (and p1 (position-if-not 'alphanumericp (input-line-string input) :start p1))))
    (input-delete-region input (input-point input) (or p2 (length (input-line-string input))))))

(defun input-backward-kill-word (input key)
  (declare (ignore key))
  (let* ((p1 (position-if 'alphanumericp (input-line-string input) :end (input-line-position input) :from-end t))
         (p2 (and p1 (position-if-not 'alphanumericp (input-line-string input) :end p1 :from-end t))))
    (input-delete-region input (input-point input) (or (and p2 (1+ p2)) 0))))

(defun input-forward-word (input key)
  (declare (ignore key))
  (let* ((p1 (position-if 'alphanumericp (input-line-string input) :start (input-line-position input)))
         (p2 (and p1 (position-if-not 'alphanumericp (input-line-string input) :start p1))))
    (setf (input-line-position input) (or p2 (length (input-line-string input))))))

(defun input-backward-word (input key)
  (declare (ignore key))
  (let* ((p1 (position-if 'alphanumericp (input-line-string input) :end (input-line-position input) :from-end t))
         (p2 (and p1 (position-if-not 'alphanumericp (input-line-string input) :end p1 :from-end t))))
    (setf (input-line-position input) (or (and p2 (1+ p2))
                                          0))))

(defun input-forward-char (input key)
  (declare (ignore key))
  (incf (input-line-position input))
  (when (> (input-line-position input)
           (length (input-line-string input)))
    (setf (input-line-position input) (length (input-line-string input)))))

(defun input-backward-char (input key)
  (declare (ignore key))
  (decf (input-line-position input))
  (when (< (input-line-position input) 0)
    (setf (input-line-position input) 0)))

(defun input-move-beginning-of-line (input key)
  (declare (ignore key))
  (setf (input-line-position input) 0))

(defun input-move-end-of-line (input key)
  (declare (ignore key))
  (setf (input-line-position input) (length (input-line-string input))))

(defun input-kill-line (input key)
  (declare (ignore key))
  (unless (= (input-line-position input) (length (input-line-string input)))
    (set-x-selection (subseq (input-line-string input) (input-line-position input))))
  (setf (fill-pointer (input-line-string input)) (input-line-position input)))

(defun input-kill-to-beginning (input key)
  (declare (ignore key))
  (unless (= (input-line-position input) 0)
    (set-x-selection (subseq (input-line-string input) 0 (input-line-position input))))
  (replace (input-line-string input) (input-line-string input)
           :start2 (input-line-position input) :start1 0)
  (decf (fill-pointer (input-line-string input)) (input-line-position input))
  (setf (input-line-position input) 0))

(defun input-history-back (input key)
  (declare (ignore key))
  (when (= (input-line-history input) -1)
    (setf (input-line-history-bk input) (input-line-string input)))
  (incf (input-line-history input))
  (if (>= (input-line-history input)
          (length *input-history*))
      (progn
        (decf (input-line-history input))
        :error)
      (setf (input-line-string input) (make-input-string (elt *input-history* (input-line-history input)))
            (input-line-position input) (length (input-line-string input)))))

(defun input-history-forward (input key)
  (declare (ignore key))
  (decf (input-line-history input))
  (cond ((< (input-line-history input) -1)
         (incf (input-line-history input))
         :error)
        ((= (input-line-history input) -1)
         (setf (input-line-string input) (input-line-history-bk input)
               (input-line-position input) (length (input-line-string input))))
        (t
         (setf (input-line-string input) (make-input-string (elt *input-history* (input-line-history input)))
               (input-line-position input) (length (input-line-string input))))))

(defun input-self-insert (input key)
  (let ((char (xlib:keysym->character *display* (key-keysym key))))
    (if (or (key-mods-p key) (null char)
            (not (characterp char)))
        :error
        (input-insert-char input char))))

(defun input-yank-selection (input key)
  (declare (ignore key))
  ;; if we own the selection then just insert it.
  (if (getf *x-selection* :primary)
      (input-insert-string input (getf *x-selection* :primary))
      (xlib:convert-selection :primary
                              :string (screen-input-window (current-screen))
                              :stumpwm-selection)))

(defun input-yank-clipboard (input key)
  (declare (ignore key))
  (if (getf *x-selection* :clipboard)
      (input-insert-string input (getf *x-selection* :clipboard))
      (xlib:convert-selection :clipboard
                              :string (screen-input-window (current-screen))
                              :stumpwm-selection)))


;;; Misc functions

(defun process-input (screen prompt input code state)
  "Process the key (code and state), given the current input
buffer. Returns a new modified input buffer."
  (labels ((process-key (code state)
             "Call the appropriate function based on the key
pressed. Return 'done when the use has signalled the finish of his
input (pressing Return), nil otherwise."
             (let* ((key (code-state->key code state))
                    (command (and key (lookup-key *input-map* key t))))
               (if command
                   (prog1
                       (funcall command input key)
                     (setf *input-last-command* command))
                   :error))))
    (case (process-key code state)
      (:done
       (unless (or (input-line-password input)
                   (and *input-history-ignore-duplicates*
                        (string= (input-line-string input) (first *input-history*))))
         (push (input-line-string input) *input-history*))
       :done)
      (:abort
       (throw :abort t))
      (:error
       ;; FIXME draw inverted text
       (draw-input-bucket screen prompt input "" t)
       nil)
      (t
       (draw-input-bucket screen prompt input)
       nil))))

(defun all-modifier-codes ()
  (multiple-value-bind
        (shift-codes lock-codes control-codes mod1-codes mod2-codes mod3-codes mod4-codes mod5-codes)
      (xlib:modifier-mapping *display*)
    (append shift-codes
            lock-codes
            control-codes
            mod1-codes
            mod2-codes
            mod3-codes
            mod4-codes
            mod5-codes)))

(defun get-modifier-map ()
  (labels ((find-mod (mod codes)
             (find (xlib:keysym->keycodes *display* (keysym-name->keysym mod)) codes)))
    (let ((modifiers (make-modifiers)))
      (multiple-value-bind
            (shift-codes lock-codes control-codes mod1-codes mod2-codes mod3-codes mod4-codes mod5-codes)
          (xlib:modifier-mapping *display*)
        (declare (ignore shift-codes lock-codes control-codes))
        (loop for mod in '(:mod-1 :mod-2 :mod-3 :mod-4 :mod-5)
              for codes in (list mod1-codes mod2-codes mod3-codes mod4-codes mod5-codes)
              do
              (cond ((or (find-mod "Meta_L" codes)
                         (find-mod "Meta_R" codes))
                     (push mod (modifiers-meta modifiers)))
                    ((or (find-mod "Alt_L" codes)
                         (find-mod "Alt_R" codes))
                     (push mod (modifiers-alt modifiers)))
                    ((or (find-mod "Super_L" codes)
                         (find-mod "Super_R" codes))
                     (push mod (modifiers-super modifiers)))
                    ((or (find-mod "Hyper_L" codes)
                         (find-mod "Hyper_R" codes))
                     (push mod (modifiers-hyper modifiers)))
                    ((find-mod "Num_Lock" codes)
                     (push mod (modifiers-numlock modifiers)))
                    ((find-mod "ISO_Level3_Shift" codes)
                     (push mod (modifiers-altgr modifiers)))))
        ;; If alt is defined but meta isn't set meta to alt and clear alt
        (when (and (modifiers-alt modifiers)
                   (null (modifiers-meta modifiers)))
          (setf (modifiers-meta modifiers) (modifiers-alt modifiers)
                (modifiers-alt modifiers) nil))
        modifiers))))

(defun update-modifier-map ()
  (setf *modifiers* (get-modifier-map)
        *all-modifiers* (all-modifier-codes)))

;; (defun x11mod->stumpmod (screen state)
;;   (let ((mod nil))
;;     (when (member state (modifiers-alt (screen-modifiers screen)))
;;       (push :alt mod))
;;     (when (member state (modifiers-meta (screen-modifiers screen)))
;;       (push :meta mod))
;;     (when (member state (modifiers-hyper (screen-modifiers screen)))
;;       (push :hyper mod))
;;     (when (member state (modifiers-super (screen-modifiers screen)))
;;       (push :super mod))
;;     (when (member state :control)
;;       (push :control mod))
;;     mod))

(defun mod->string (state)
  "Convert a stump modifier list to a string"
  (let ((alist '((:alt . "A-") (:meta . "M-") (:hyper . "H-") (:super . "S-"))))
    (apply #'concatenate 'string (mapcar (lambda (x) (cdr (assoc x alist))) state))))

;; (defun keycode->string (code state)
;;   (concatenate 'string (mod->string state)
;;             (string (keysym->character *display*
;;                                        (xlib:keycode->keysym *display* code 0)
;;                                        state))))

;; (defun cook-keycode (code state)
;;   (values (xlib:keycode->keysym *display* code 0) (x11mod->stumpmod state)))

(defun y-or-n-p (message)
  "ask a \"y or n\" question on the current screen and return T if the
user presses 'y'"
  (message "~a(y or n) " message)
  (char= (read-one-char (current-screen))
        #\y))

(defun yes-or-no-p (message)
  "ask a \"yes or no\" question on the current screen and return T if the
user presses 'yes'"
  (loop for line = (read-one-line (current-screen)
                                  (format nil "~a(yes or no) " message))
        until (find line '("yes" "no") :test 'string-equal)
        do (message "Please answer yes or no")
           (sleep 1)
        finally (return (string-equal line "yes"))))