aboutsummaryrefslogtreecommitdiff
path: root/emacs/guix-list.el
blob: bac85be981941fda237a8374271919720f94b4e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
;;; guix-list.el --- List buffers for displaying entries   -*- lexical-binding: t -*-

;; Copyright © 2014, 2015 Alex Kost <alezost@gmail.com>

;; This file is part of GNU Guix.

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

;; GNU Guix 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 program.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; This file provides a list-like buffer for displaying information
;; about Guix packages and generations.

;;; Code:

(require 'cl-lib)
(require 'tabulated-list)
(require 'guix-info)
(require 'guix-base)
(require 'guix-entry)
(require 'guix-utils)

(defgroup guix-list nil
  "General settings for list buffers."
  :prefix "guix-list-"
  :group 'guix)

(defgroup guix-list-faces nil
  "Faces for list buffers."
  :group 'guix-list
  :group 'guix-faces)

(defface guix-list-file-path
  '((t :inherit guix-info-file-path))
  "Face used for file paths."
  :group 'guix-list-faces)

(defface guix-list-time
  '((t :inherit guix-info-time))
  "Face used for time stamps."
  :group 'guix-list-faces)

(defvar guix-list-column-titles
  '((generation
     (number . "N.")))
  "Column titles for list buffers.
Has the same structure as `guix-param-titles', but titles from
this list have a priority.")

(defun guix-list-describe (&optional mark-names)
  "Describe entries marked with a general mark.
'Describe' means display entries in 'info' buffer.
If no entries are marked, describe the current entry.
With prefix argument, describe entries marked with any mark."
  (interactive (list (unless current-prefix-arg '(general))))
  (let* ((ids        (or (apply #'guix-list-get-marked-id-list mark-names)
                         (list (guix-list-current-id))))
         (count      (length ids))
         (entry-type guix-entry-type))
    (when (or (<= count (guix-list-describe-warning-count entry-type))
              (y-or-n-p (format "Do you really want to describe %d entries? "
                                count)))
      (guix-list-describe-entries entry-type ids))))

(defun guix-list-describe-ids (ids)
  "Describe entries with IDS (list of identifiers)."
  (apply #'guix-get-show-entries
         guix-profile 'info guix-entry-type 'id ids))


;;; Wrappers for 'list' variables

(defvar guix-list-data nil
  "Alist with 'list' data.
This alist is filled by `guix-list-define-entry-type' macro.")

(defun guix-list-value (entry-type symbol)
  "Return SYMBOL's value for ENTRY-TYPE from `guix-list-data'."
  (symbol-value (guix-assq-value guix-list-data entry-type symbol)))

(defun guix-list-param-title (entry-type param)
  "Return column title of an ENTRY-TYPE parameter PARAM."
  (or (guix-assq-value guix-list-column-titles
                       entry-type param)
      (guix-get-param-title entry-type param)))

(defun guix-list-format (entry-type)
  "Return column format for ENTRY-TYPE."
  (guix-list-value entry-type 'format))

(defun guix-list-displayed-params (entry-type)
  "Return a list of ENTRY-TYPE parameters that should be displayed."
  (mapcar #'car (guix-list-format entry-type)))

(defun guix-list-sort-key (entry-type)
  "Return sort key for ENTRY-TYPE."
  (guix-list-value entry-type 'sort-key))

(defun guix-list-additional-marks (entry-type)
  "Return alist of additional marks for ENTRY-TYPE."
  (guix-list-value entry-type 'marks))

(defun guix-list-describe-warning-count (entry-type)
  "Return the maximum number of ENTRY-TYPE entries to describe."
  (guix-list-value entry-type 'describe-count))

(defun guix-list-describe-entries (entry-type ids)
  "Describe ENTRY-TYPE entries with IDS in 'info' buffer"
  (funcall (guix-list-value entry-type 'describe)
           ids))


;;; Tabulated list internals

(defun guix-list-sort-numerically (column a b)
  "Compare COLUMN of tabulated entries A and B numerically.
This function is used for sort predicates for `tabulated-list-format'.
Return non-nil, if B is bigger than A."
  (cl-flet ((num (entry)
              (string-to-number (aref (cadr entry) column))))
    (> (num b) (num a))))

(defmacro guix-list-define-numerical-sorter (column)
  "Define numerical sort predicate for COLUMN.
See `guix-list-sort-numerically' for details."
  (let ((name (intern (format "guix-list-sort-numerically-%d" column)))
        (doc  (format "\
Predicate to sort tabulated list by column %d numerically.
See `guix-list-sort-numerically' for details."
                      column)))
    `(defun ,name (a b)
       ,doc
       (guix-list-sort-numerically ,column a b))))

(defmacro guix-list-define-numerical-sorters (n)
  "Define numerical sort predicates for columns from 0 to N.
See `guix-list-define-numerical-sorter' for details."
  `(progn
     ,@(mapcar (lambda (i)
                 `(guix-list-define-numerical-sorter ,i))
               (number-sequence 0 n))))

(guix-list-define-numerical-sorters 9)

(defun guix-list-tabulated-sort-key (entry-type)
  "Return ENTRY-TYPE sort key for `tabulated-list-sort-key'."
  (let ((sort-key (guix-list-sort-key entry-type)))
    (and sort-key
         (cons (guix-list-param-title entry-type (car sort-key))
               (cdr sort-key)))))

(defun guix-list-tabulated-vector (entry-type fun)
  "Call FUN on each column specification for ENTRY-TYPE.

FUN is applied to column specification as arguments (see
`guix-list-format').

Return a vector made of values of FUN calls."
  (apply #'vector
         (mapcar (lambda (col-spec)
                   (apply fun col-spec))
                 (guix-list-format entry-type))))

(defun guix-list-tabulated-format (entry-type)
  "Return ENTRY-TYPE list specification for `tabulated-list-format'."
  (guix-list-tabulated-vector
   entry-type
   (lambda (param _ &rest rest-spec)
     (cons (guix-list-param-title entry-type param)
           rest-spec))))

(defun guix-list-insert-entries (entries entry-type)
  "Display ENTRIES of ENTRY-TYPE in the current list buffer.
ENTRIES should have a form of `guix-entries'."
  (setq tabulated-list-entries
        (guix-list-tabulated-entries entries entry-type))
  (tabulated-list-print))

(defun guix-list-tabulated-entries (entries entry-type)
  "Return a list of ENTRY-TYPE values for `tabulated-list-entries'."
  (mapcar (lambda (entry)
            (list (guix-entry-id entry)
                  (guix-list-tabulated-entry entry entry-type)))
          entries))

(defun guix-list-tabulated-entry (entry entry-type)
  "Return array of values for `tabulated-list-entries'.
Parameters are taken from ENTRY-TYPE ENTRY."
  (guix-list-tabulated-vector
   entry-type
   (lambda (param fun &rest _)
     (let ((val (guix-entry-value entry param)))
       (if fun
           (funcall fun val entry)
         (guix-get-string val))))))

(defun guix-list-get-one-line (val &optional _)
  "Return one-line string from a multi-line string VAL.
VAL may be nil."
  (if val
      (guix-get-one-line val)
    (guix-get-string nil)))

(defun guix-list-get-time (seconds &optional _)
  "Return formatted time string from SECONDS."
  (guix-get-string (guix-get-time-string seconds)
                   'guix-list-time))

(defun guix-list-get-file-path (path &optional _)
  "Return PATH button specification for `tabulated-list-entries'."
  (list path
        'face 'guix-list-file-path
        'action (lambda (btn) (find-file (button-label btn)))
        'follow-link t
        'help-echo "Find file"))

(defun guix-list-current-id ()
  "Return ID of the current entry."
  (or (tabulated-list-get-id)
      (user-error "No entry here")))

(defun guix-list-current-entry ()
  "Return alist of the current entry info."
  (guix-entry-by-id (guix-list-current-id) guix-entries))

(defun guix-list-current-package-id ()
  "Return ID of the current package."
  (cl-ecase major-mode
    (guix-package-list-mode
     (guix-list-current-id))
    (guix-output-list-mode
     (guix-entry-value (guix-list-current-entry) 'package-id))))

(defun guix-list-for-each-line (fun &rest args)
  "Call FUN with ARGS for each entry line."
  (or (derived-mode-p 'guix-list-mode)
      (error "The current buffer is not in Guix List mode"))
  (save-excursion
    (goto-char (point-min))
    (while (not (eobp))
      (apply fun args)
      (forward-line))))

(defun guix-list-fold-lines (fun init)
  "Fold over entry lines in the current list buffer.
Call FUN with RESULT as argument for each line, using INIT as
the initial value of RESULT.  Return the final result."
  (let ((res init))
    (guix-list-for-each-line
     (lambda () (setq res (funcall fun res))))
    res))


;;; Marking and sorting

(defvar-local guix-list-marked nil
  "List of the marked entries.
Each element of the list has a form:

  (ID MARK-NAME . ARGS)

ID is an entry ID.
MARK-NAME is a symbol from `guix-list-marks'.
ARGS is a list of additional values.")

(defvar-local guix-list-marks nil
  "Alist of available mark names and mark characters.")

(defvar guix-list-default-marks
  '((empty   . ?\s)
    (general . ?*))
  "Alist of default mark names and mark characters.")

(defun guix-list-marks (entry-type)
  "Return alist of available marks for ENTRY-TYPE."
  (append guix-list-default-marks
          (guix-list-additional-marks entry-type)))

(defun guix-list-get-mark (name)
  "Return mark character by its NAME."
  (or (guix-assq-value guix-list-marks name)
      (error "Mark '%S' not found" name)))

(defun guix-list-get-mark-string (name)
  "Return mark string by its NAME."
  (string (guix-list-get-mark name)))

(defun guix-list-current-mark ()
  "Return mark character of the current line."
  (char-after (line-beginning-position)))

(defun guix-list-get-marked (&rest mark-names)
  "Return list of specs of entries marked with any mark from MARK-NAMES.
Entry specs are elements from `guix-list-marked' list.
If MARK-NAMES are not specified, use all marks from
`guix-list-marks' except the `empty' one."
  (or mark-names
      (setq mark-names
            (delq 'empty
                  (mapcar #'car guix-list-marks))))
  (cl-remove-if-not (lambda (assoc)
                      (memq (cadr assoc) mark-names))
                    guix-list-marked))

(defun guix-list-get-marked-args (mark-name)
  "Return list of (ID . ARGS) elements from lines marked with MARK-NAME.
See `guix-list-marked' for the meaning of ARGS."
  (mapcar (lambda (spec)
            (let ((id (car spec))
                  (args (cddr spec)))
              (cons id args)))
          (guix-list-get-marked mark-name)))

(defun guix-list-get-marked-id-list (&rest mark-names)
  "Return list of IDs of entries marked with any mark from MARK-NAMES.
See `guix-list-get-marked' for details."
  (mapcar #'car (apply #'guix-list-get-marked mark-names)))

(defun guix-list--mark (mark-name &optional advance &rest args)
  "Put a mark on the current line.
Also add the current entry to `guix-list-marked' using its ID and ARGS.
MARK-NAME is a symbol from `guix-list-marks'.
If ADVANCE is non-nil, move forward by one line after marking."
  (let ((id (guix-list-current-id)))
    (if (eq mark-name 'empty)
        (setq guix-list-marked (assq-delete-all id guix-list-marked))
      (let ((assoc (assq id guix-list-marked))
            (val (cons mark-name args)))
        (if assoc
            (setcdr assoc val)
          (push (cons id val) guix-list-marked)))))
  (tabulated-list-put-tag (guix-list-get-mark-string mark-name)
                          advance))

(defun guix-list-mark (&optional arg)
  "Mark the current line and move to the next line.
With ARG, mark all lines."
  (interactive "P")
  (if arg
      (guix-list-mark-all)
    (guix-list--mark 'general t)))

(defun guix-list-mark-all (&optional mark-name)
  "Mark all lines with MARK-NAME mark.
MARK-NAME is a symbol from `guix-list-marks'.
Interactively, put a general mark on all lines."
  (interactive)
  (or mark-name (setq mark-name 'general))
  (guix-list-for-each-line #'guix-list--mark mark-name))

(defun guix-list-unmark (&optional arg)
  "Unmark the current line and move to the next line.
With ARG, unmark all lines."
  (interactive "P")
  (if arg
      (guix-list-unmark-all)
    (guix-list--mark 'empty t)))

(defun guix-list-unmark-backward ()
  "Move up one line and unmark it."
  (interactive)
  (forward-line -1)
  (guix-list--mark 'empty))

(defun guix-list-unmark-all ()
  "Unmark all lines."
  (interactive)
  (guix-list-mark-all 'empty))

(defun guix-list-restore-marks ()
  "Put marks according to `guix-list-marked'."
  (guix-list-for-each-line
   (lambda ()
     (let ((mark-name (car (guix-assq-value guix-list-marked
                                            (guix-list-current-id)))))
       (tabulated-list-put-tag
        (guix-list-get-mark-string (or mark-name 'empty)))))))

(defun guix-list-sort (&optional n)
  "Sort guix list entries by the column at point.
With a numeric prefix argument N, sort the Nth column.
Same as `tabulated-list-sort', but also restore marks after sorting."
  (interactive "P")
  (tabulated-list-sort n)
  (guix-list-restore-marks))


;;; Major mode and interface definer

(defvar guix-list-mode-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent
     map (make-composed-keymap guix-root-map
                               tabulated-list-mode-map))
    (define-key map (kbd "RET") 'guix-list-describe)
    (define-key map (kbd "i")   'guix-list-describe)
    (define-key map (kbd "m")   'guix-list-mark)
    (define-key map (kbd "*")   'guix-list-mark)
    (define-key map (kbd "u")   'guix-list-unmark)
    (define-key map (kbd "DEL") 'guix-list-unmark-backward)
    (define-key map [remap tabulated-list-sort] 'guix-list-sort)
    map)
  "Keymap for `guix-list-mode' buffers.")

(define-derived-mode guix-list-mode tabulated-list-mode "Guix-List"
  "Parent mode for displaying data in 'list' form.")

(defun guix-list-mode-initialize (entry-type)
  "Set up the current 'list' buffer for displaying ENTRY-TYPE entries."
  (setq tabulated-list-padding  2
        tabulated-list-format   (guix-list-tabulated-format entry-type)
        tabulated-list-sort-key (guix-list-tabulated-sort-key entry-type))
  (setq-local guix-list-marks   (guix-list-marks entry-type))
  (tabulated-list-init-header))

(defmacro guix-list-define-entry-type (entry-type &rest args)
  "Define common stuff for displaying ENTRY-TYPE entries in list buffers.
Remaining arguments (ARGS) should have a form [KEYWORD VALUE] ...

Required keywords:

  - `:format' - default value of the generated
    `guix-ENTRY-TYPE-list-format' variable.

Optional keywords:

  - `:sort-key' - default value of the generated
    `guix-ENTRY-TYPE-list-sort-key' variable.

  - `:describe-function' - default value of the generated
    `guix-ENTRY-TYPE-describe-function' variable.

  - `:marks' - default value of the generated
    `guix-ENTRY-TYPE-list-marks' variable.
"
  (let* ((entry-type-str     (symbol-name entry-type))
         (prefix             (concat "guix-" entry-type-str "-list"))
         (group              (intern prefix))
         (mode-str           (concat prefix "-mode"))
         (init-fun           (intern (concat prefix "-mode-initialize")))
         (describe-var       (intern (concat prefix "-describe-function")))
         (describe-count-var (intern (concat prefix
                                             "-describe-warning-count")))
         (format-var         (intern (concat prefix "-format")))
         (sort-key-var       (intern (concat prefix "-sort-key")))
         (marks-var          (intern (concat prefix "-marks"))))
    (guix-keyword-args-let args
        ((describe-val       :describe-function)
         (describe-count-val :describe-count 10)
         (format-val         :format)
         (sort-key-val       :sort-key)
         (marks-val          :marks))
      `(progn
         (defcustom ,format-var ,format-val
           ,(format "\
List of format values of the displayed columns.
Each element of the list has a form:

  (PARAM VALUE-FUN WIDTH SORT . PROPS)

PARAM is a name of '%s' entry parameter.

VALUE-FUN may be either nil or a function returning a value that
will be inserted.  The function is called with 2 arguments: the
first one is the value of the parameter; the second one is an
entry (alist of parameter names and values).

For the meaning of WIDTH, SORT and PROPS, see
`tabulated-list-format'."
                    entry-type-str)
           :type 'sexp
           :group ',group)

         (defcustom ,sort-key-var ,sort-key-val
           ,(format "\
Default sort key for 'list' buffer with '%s' entries.
Should be nil (no sort) or have a form:

  (PARAM . FLIP)

PARAM is the name of '%s' entry parameter.  For the meaning of
FLIP, see `tabulated-list-sort-key'."
                    entry-type-str entry-type-str)
           :type '(choice (const :tag "No sort" nil)
                          (cons symbol boolean))
           :group ',group)

         (defvar ,marks-var ,marks-val
           ,(format "\
Alist of additional marks for 'list' buffer with '%s' entries.
Marks from this list are used along with `guix-list-default-marks'."
                    entry-type-str))

         (defcustom ,describe-count-var ,describe-count-val
           ,(format "\
The maximum number of '%s' entries to describe without a warning.
If a user wants to describe more than this number of marked
entries, he will be prompted for confirmation.
See also `guix-list-describe'."
                    entry-type-str)
           :type 'integer
           :group ',group)

         (defvar ,describe-var ,describe-val
           ,(format "Function used to describe '%s' entries."
                    entry-type-str))

         (defun ,init-fun ()
           ,(concat "Initial settings for `" mode-str "'.")
           (guix-list-mode-initialize ',entry-type))

         (guix-alist-put!
          '((describe       . ,describe-var)
            (describe-count . ,describe-count-var)
            (format         . ,format-var)
            (sort-key       . ,sort-key-var)
            (marks          . ,marks-var))
          'guix-list-data ',entry-type)))))

(put 'guix-list-define-entry-type 'lisp-indent-function 'defun)

(defun guix-list-edit-package ()
  "Go to the location of the current package."
  (interactive)
  (guix-edit (guix-list-current-package-id)))


;;; Displaying packages

(guix-define-buffer-type list package)

(guix-list-define-entry-type package
  :describe-function 'guix-list-describe-ids
  :format '((name guix-package-list-get-name 20 t)
            (version nil 10 nil)
            (outputs nil 13 t)
            (installed guix-package-list-get-installed-outputs 13 t)
            (synopsis guix-list-get-one-line 30 nil))
  :sort-key '(name)
  :marks '((install . ?I)
           (upgrade . ?U)
           (delete  . ?D)))

(defface guix-package-list-installed
  '((t :inherit guix-package-info-installed-outputs))
  "Face used if there are installed outputs for the current package."
  :group 'guix-package-list-faces)

(defface guix-package-list-obsolete
  '((t :inherit guix-package-info-obsolete))
  "Face used if a package is obsolete."
  :group 'guix-package-list-faces)

(defcustom guix-package-list-generation-marking-enabled nil
  "If non-nil, allow putting marks in a list with 'generation packages'.

By default this is disabled, because it may be confusing.  For
example a package is installed in some generation, so a user can
mark it for deletion in the list of packages from this
generation, but the package may not be installed in the latest
generation, so actually it cannot be deleted.

If you managed to understand the explanation above or if you
really know what you do or if you just don't care, you can set
this variable to t.  It should not do much harm anyway (most
likely)."
  :type 'boolean
  :group 'guix-package-list)

(let ((map guix-package-list-mode-map))
  (define-key map (kbd "e")   'guix-list-edit-package)
  (define-key map (kbd "x")   'guix-package-list-execute)
  (define-key map (kbd "i")   'guix-package-list-mark-install)
  (define-key map (kbd "d")   'guix-package-list-mark-delete)
  (define-key map (kbd "U")   'guix-package-list-mark-upgrade)
  (define-key map (kbd "^")   'guix-package-list-mark-upgrades))

(defun guix-package-list-get-name (name entry)
  "Return NAME of the package ENTRY.
Colorize it with `guix-package-list-installed' or
`guix-package-list-obsolete' if needed."
  (guix-get-string name
                   (cond ((guix-entry-value entry 'obsolete)
                          'guix-package-list-obsolete)
                         ((guix-entry-value entry 'installed)
                          'guix-package-list-installed))))

(defun guix-package-list-get-installed-outputs (installed &optional _)
  "Return string with outputs from INSTALLED entries."
  (guix-get-string
   (mapcar (lambda (entry)
             (guix-entry-value entry 'output))
           installed)))

(defun guix-package-list-marking-check ()
  "Signal an error if marking is disabled for the current buffer."
  (when (and (not guix-package-list-generation-marking-enabled)
             (or (derived-mode-p 'guix-package-list-mode)
                 (derived-mode-p 'guix-output-list-mode))
             (eq guix-search-type 'generation))
    (error "Action marks are disabled for lists of 'generation packages'")))

(defun guix-package-list-mark-outputs (mark default
                                       &optional prompt available)
  "Mark the current package with MARK and move to the next line.
If PROMPT is non-nil, use it to ask a user for outputs from
AVAILABLE list, otherwise mark all DEFAULT outputs."
  (let ((outputs (if prompt
                     (guix-completing-read-multiple
                      prompt available nil t)
                   default)))
    (apply #'guix-list--mark mark t outputs)))

(defun guix-package-list-mark-install (&optional arg)
  "Mark the current package for installation and move to the next line.
With ARG, prompt for the outputs to install (several outputs may
be separated with \",\")."
  (interactive "P")
  (guix-package-list-marking-check)
  (let* ((entry     (guix-list-current-entry))
         (all       (guix-entry-value entry 'outputs))
         (installed (guix-package-installed-outputs entry))
         (available (cl-set-difference all installed :test #'string=)))
    (or available
        (user-error "This package is already installed"))
    (guix-package-list-mark-outputs
     'install '("out")
     (and arg "Output(s) to install: ")
     available)))

(defun guix-package-list-mark-delete (&optional arg)
  "Mark the current package for deletion and move to the next line.
With ARG, prompt for the outputs to delete (several outputs may
be separated with \",\")."
  (interactive "P")
  (guix-package-list-marking-check)
  (let* ((entry (guix-list-current-entry))
         (installed (guix-package-installed-outputs entry)))
    (or installed
        (user-error "This package is not installed"))
    (guix-package-list-mark-outputs
     'delete installed
     (and arg "Output(s) to delete: ")
     installed)))

(defun guix-package-list-mark-upgrade (&optional arg)
  "Mark the current package for upgrading and move to the next line.
With ARG, prompt for the outputs to upgrade (several outputs may
be separated with \",\")."
  (interactive "P")
  (guix-package-list-marking-check)
  (let* ((entry (guix-list-current-entry))
         (installed (guix-package-installed-outputs entry)))
    (or installed
        (user-error "This package is not installed"))
    (when (or (guix-entry-value entry 'obsolete)
              (y-or-n-p "This package is not obsolete.  Try to upgrade it anyway? "))
      (guix-package-list-mark-outputs
       'upgrade installed
       (and arg "Output(s) to upgrade: ")
       installed))))

(defun guix-list-mark-package-upgrades (fun)
  "Mark all obsolete packages for upgrading.
Use FUN to perform marking of the current line.  FUN should
accept an entry as argument."
  (guix-package-list-marking-check)
  (let ((obsolete (cl-remove-if-not
                   (lambda (entry)
                     (guix-entry-value entry 'obsolete))
                   guix-entries)))
    (guix-list-for-each-line
     (lambda ()
       (let* ((id (guix-list-current-id))
              (entry (cl-find-if
                      (lambda (entry)
                        (equal id (guix-entry-id entry)))
                      obsolete)))
         (when entry
           (funcall fun entry)))))))

(defun guix-package-list-mark-upgrades ()
  "Mark all obsolete packages for upgrading."
  (interactive)
  (guix-list-mark-package-upgrades
   (lambda (entry)
     (apply #'guix-list--mark
            'upgrade nil
            (guix-package-installed-outputs entry)))))

(defun guix-list-execute-package-actions (fun)
  "Perform actions on the marked packages.
Use FUN to define actions suitable for `guix-process-package-actions'.
FUN should accept action-type as argument."
  (let ((actions (delq nil
                       (mapcar fun '(install delete upgrade)))))
    (if actions
        (guix-process-package-actions
         guix-profile actions (current-buffer))
      (user-error "No operations specified"))))

(defun guix-package-list-execute ()
  "Perform actions on the marked packages."
  (interactive)
  (guix-list-execute-package-actions #'guix-package-list-make-action))

(defun guix-package-list-make-action (action-type)
  "Return action specification for the packages marked with ACTION-TYPE.
Return nil, if there are no packages marked with ACTION-TYPE.
The specification is suitable for `guix-process-package-actions'."
  (let ((specs (guix-list-get-marked-args action-type)))
    (and specs (cons action-type specs))))


;;; Displaying outputs

(guix-define-buffer-type list output
  :buffer-name "*Guix Package List*"
  :required (package-id))

(guix-list-define-entry-type output
  :describe-function 'guix-output-list-describe
  :format '((name guix-package-list-get-name 20 t)
            (version nil 10 nil)
            (output nil 9 t)
            (installed nil 12 t)
            (synopsis guix-list-get-one-line 30 nil))
  :sort-key '(name)
  :marks '((install . ?I)
           (upgrade . ?U)
           (delete  . ?D)))

(let ((map guix-output-list-mode-map))
  (define-key map (kbd "e")   'guix-list-edit-package)
  (define-key map (kbd "x")   'guix-output-list-execute)
  (define-key map (kbd "i")   'guix-output-list-mark-install)
  (define-key map (kbd "d")   'guix-output-list-mark-delete)
  (define-key map (kbd "U")   'guix-output-list-mark-upgrade)
  (define-key map (kbd "^")   'guix-output-list-mark-upgrades))

(defun guix-output-list-mark-install ()
  "Mark the current output for installation and move to the next line."
  (interactive)
  (guix-package-list-marking-check)
  (let* ((entry     (guix-list-current-entry))
         (installed (guix-entry-value entry 'installed)))
    (if installed
        (user-error "This output is already installed")
      (guix-list--mark 'install t))))

(defun guix-output-list-mark-delete ()
  "Mark the current output for deletion and move to the next line."
  (interactive)
  (guix-package-list-marking-check)
  (let* ((entry     (guix-list-current-entry))
         (installed (guix-entry-value entry 'installed)))
    (if installed
        (guix-list--mark 'delete t)
      (user-error "This output is not installed"))))

(defun guix-output-list-mark-upgrade ()
  "Mark the current output for deletion and move to the next line."
  (interactive)
  (guix-package-list-marking-check)
  (let* ((entry     (guix-list-current-entry))
         (installed (guix-entry-value entry 'installed)))
    (or installed
        (user-error "This output is not installed"))
    (when (or (guix-entry-value entry 'obsolete)
              (y-or-n-p "This output is not obsolete.  Try to upgrade it anyway? "))
      (guix-list--mark 'upgrade t))))

(defun guix-output-list-mark-upgrades ()
  "Mark all obsolete package outputs for upgrading."
  (interactive)
  (guix-list-mark-package-upgrades
   (lambda (_) (guix-list--mark 'upgrade))))

(defun guix-output-list-execute ()
  "Perform actions on the marked outputs."
  (interactive)
  (guix-list-execute-package-actions #'guix-output-list-make-action))

(defun guix-output-list-make-action (action-type)
  "Return action specification for the outputs marked with ACTION-TYPE.
Return nil, if there are no outputs marked with ACTION-TYPE.
The specification is suitable for `guix-process-output-actions'."
  (let ((ids (guix-list-get-marked-id-list action-type)))
    (and ids (cons action-type
                   (mapcar #'guix-package-id-and-output-by-output-id
                           ids)))))

(defun guix-output-list-describe (ids)
  "Describe outputs with IDS (list of output identifiers).
See `guix-package-info-type'."
  (if (eq guix-package-info-type 'output)
      (apply #'guix-get-show-entries
             guix-profile 'info 'output 'id ids)
    (let ((pids (mapcar (lambda (oid)
                          (car (guix-package-id-and-output-by-output-id
                                oid)))
                        ids)))
      (apply #'guix-get-show-entries
             guix-profile 'info 'package 'id
             (cl-remove-duplicates pids)))))


;;; Displaying generations

(guix-define-buffer-type list generation)

(guix-list-define-entry-type generation
  :describe-function 'guix-list-describe-ids
  :format '((number nil 5 guix-list-sort-numerically-0 :right-align t)
            (current guix-generation-list-get-current 10 t)
            (time guix-list-get-time 20 t)
            (path guix-list-get-file-path 30 t))
  :sort-key '(number . t)
  :marks '((delete . ?D)))

(let ((map guix-generation-list-mode-map))
  (define-key map (kbd "RET") 'guix-generation-list-show-packages)
  (define-key map (kbd "+")   'guix-generation-list-show-added-packages)
  (define-key map (kbd "-")   'guix-generation-list-show-removed-packages)
  (define-key map (kbd "=")   'guix-generation-list-diff)
  (define-key map (kbd "D")   'guix-generation-list-diff)
  (define-key map (kbd "e")   'guix-generation-list-ediff)
  (define-key map (kbd "x")   'guix-generation-list-execute)
  (define-key map (kbd "s")   'guix-generation-list-switch)
  (define-key map (kbd "d")   'guix-generation-list-mark-delete))

(defun guix-generation-list-get-current (val &optional _)
  "Return string from VAL showing whether this generation is current.
VAL is a boolean value."
  (if val "(current)" ""))

(defun guix-generation-list-switch ()
  "Switch current profile to the generation at point."
  (interactive)
  (let* ((entry   (guix-list-current-entry))
         (current (guix-entry-value entry 'current))
         (number  (guix-entry-value entry 'number)))
    (if current
        (user-error "This generation is already the current one")
      (guix-switch-to-generation guix-profile number (current-buffer)))))

(defun guix-generation-list-show-packages ()
  "List installed packages for the generation at point."
  (interactive)
  (guix-get-show-entries guix-profile 'list guix-package-list-type
                         'generation (guix-list-current-id)))

(defun guix-generation-list-generations-to-compare ()
  "Return a sorted list of 2 marked generations for comparing."
  (let ((numbers (guix-list-get-marked-id-list 'general)))
    (if (/= (length numbers) 2)
        (user-error "2 generations should be marked for comparing")
      (sort numbers #'<))))

(defun guix-generation-list-show-added-packages ()
  "List package outputs added to the latest marked generation.
If 2 generations are marked with \\[guix-list-mark], display
outputs installed in the latest marked generation that were not
installed in the other one."
  (interactive)
  (apply #'guix-get-show-entries
         guix-profile 'list 'output 'generation-diff
         (reverse (guix-generation-list-generations-to-compare))))

(defun guix-generation-list-show-removed-packages ()
  "List package outputs removed from the latest marked generation.
If 2 generations are marked with \\[guix-list-mark], display
outputs not installed in the latest marked generation that were
installed in the other one."
  (interactive)
  (apply #'guix-get-show-entries
         guix-profile 'list 'output 'generation-diff
         (guix-generation-list-generations-to-compare)))

(defun guix-generation-list-compare (diff-fun gen-fun)
  "Run GEN-FUN on the 2 marked generations and run DIFF-FUN on the results."
  (cl-multiple-value-bind (gen1 gen2)
      (guix-generation-list-generations-to-compare)
    (funcall diff-fun
             (funcall gen-fun gen1)
             (funcall gen-fun gen2))))

(defun guix-generation-list-ediff-manifests ()
  "Run Ediff on manifests of the 2 marked generations."
  (interactive)
  (guix-generation-list-compare
   #'ediff-files
   #'guix-profile-generation-manifest-file))

(defun guix-generation-list-diff-manifests ()
  "Run Diff on manifests of the 2 marked generations."
  (interactive)
  (guix-generation-list-compare
   #'guix-diff
   #'guix-profile-generation-manifest-file))

(defun guix-generation-list-ediff-packages ()
  "Run Ediff on package outputs installed in the 2 marked generations."
  (interactive)
  (guix-generation-list-compare
   #'ediff-buffers
   #'guix-profile-generation-packages-buffer))

(defun guix-generation-list-diff-packages ()
  "Run Diff on package outputs installed in the 2 marked generations."
  (interactive)
  (guix-generation-list-compare
   #'guix-diff
   #'guix-profile-generation-packages-buffer))

(defun guix-generation-list-ediff (arg)
  "Run Ediff on package outputs installed in the 2 marked generations.
With ARG, run Ediff on manifests of the marked generations."
  (interactive "P")
  (if arg
      (guix-generation-list-ediff-manifests)
    (guix-generation-list-ediff-packages)))

(defun guix-generation-list-diff (arg)
  "Run Diff on package outputs installed in the 2 marked generations.
With ARG, run Diff on manifests of the marked generations."
  (interactive "P")
  (if arg
      (guix-generation-list-diff-manifests)
    (guix-generation-list-diff-packages)))

(defun guix-generation-list-mark-delete (&optional arg)
  "Mark the current generation for deletion and move to the next line.
With ARG, mark all generations for deletion."
  (interactive "P")
  (if arg
      (guix-list-mark-all 'delete)
    (guix-list--mark 'delete t)))

(defun guix-generation-list-execute ()
  "Delete marked generations."
  (interactive)
  (let ((marked (guix-list-get-marked-id-list 'delete)))
    (or marked
        (user-error "No generations marked for deletion"))
    (guix-delete-generations guix-profile marked (current-buffer))))

(provide 'guix-list)

;;; guix-list.el ends here