aboutsummaryrefslogtreecommitdiff
path: root/emacs/guix-base.el
blob: 5b98579c5d34690d5f37afcf7b51f7b2ce1fa03b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
;;; guix-base.el --- Common definitions   -*- lexical-binding: t -*-

;; Copyright © 2014 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 some base and common definitions for guix.el
;; package.

;; List and info buffers have many common patterns that are defined
;; using `guix-define-buffer-type' macro from this file.

;;; Code:

(require 'cl-lib)
(require 'guix-backend)
(require 'guix-utils)


;;; Profiles

(defvar guix-user-profile
  (expand-file-name "~/.guix-profile")
  "User profile.")

(defvar guix-default-profile
  (concat (or (getenv "NIX_STATE_DIR") "/var/guix")
          "/profiles/per-user/"
          (getenv "USER")
          "/guix-profile")
  "Default Guix profile.")

(defvar guix-current-profile guix-default-profile
  "Current profile.")

(defun guix-profile-prompt (&optional default)
  "Prompt for profile and return it.
Use DEFAULT as a start directory.  If it is nil, use
`guix-current-profile'."
  (let* ((path (read-file-name "Profile: "
                               (file-name-directory
                                (or default guix-current-profile))))
         (path (directory-file-name (expand-file-name path))))
    (if (string= path guix-user-profile)
        guix-default-profile
      path)))

(defun guix-set-current-profile (path)
  "Set `guix-current-profile' to PATH.
Interactively, prompt for PATH.  With prefix, use
`guix-default-profile'."
  (interactive
   (list (if current-prefix-arg
             guix-default-profile
           (guix-profile-prompt))))
  (setq guix-current-profile path)
  (message "Current profile has been set to '%s'."
           guix-current-profile))


;;; Parameters of the entries

(defvar guix-param-titles
  '((package
     (id                . "ID")
     (name              . "Name")
     (version           . "Version")
     (license           . "License")
     (synopsis          . "Synopsis")
     (description       . "Description")
     (home-url          . "Home page")
     (outputs           . "Outputs")
     (inputs            . "Inputs")
     (native-inputs     . "Native inputs")
     (propagated-inputs . "Propagated inputs")
     (location          . "Location")
     (installed         . "Installed"))
    (installed
     (path              . "Installed path")
     (dependencies      . "Dependencies")
     (output            . "Output"))
    (output
     (id                . "ID")
     (name              . "Name")
     (version           . "Version")
     (license           . "License")
     (synopsis          . "Synopsis")
     (description       . "Description")
     (home-url          . "Home page")
     (output            . "Output")
     (inputs            . "Inputs")
     (native-inputs     . "Native inputs")
     (propagated-inputs . "Propagated inputs")
     (location          . "Location")
     (installed         . "Installed")
     (path              . "Installed path")
     (dependencies      . "Dependencies"))
    (generation
     (id                . "ID")
     (number            . "Number")
     (prev-number       . "Previous number")
     (current           . "Current")
     (path              . "Path")
     (time              . "Time")))
  "List for defining titles of entry parameters.
Titles are used for displaying information about entries.
Each element of the list has a form:

  (ENTRY-TYPE . ((PARAM . TITLE) ...))")

(defun guix-get-param-title (entry-type param)
  "Return title of an ENTRY-TYPE entry parameter PARAM."
  (or (guix-get-key-val guix-param-titles
                        entry-type param)
      (prog1 (symbol-name param)
        (message "Couldn't find title for '%S %S'."
                 entry-type param))))

(defun guix-get-name-spec (name version &optional output)
  "Return Guix package specification by its NAME, VERSION and OUTPUT."
  (concat name "-" version
          (when output (concat ":" output))))

(defun guix-get-full-name (entry &optional output)
  "Return name specification of the package ENTRY and OUTPUT."
  (guix-get-name-spec (guix-get-key-val entry 'name)
                      (guix-get-key-val entry 'version)
                      output))

(defun guix-entry-to-specification (entry)
  "Return name specification by the package or output ENTRY."
  (guix-get-name-spec (guix-get-key-val entry 'name)
                      (guix-get-key-val entry 'version)
                      (guix-get-key-val entry 'output)))

(defun guix-entries-to-specifications (entries)
  "Return name specifications by the package or output ENTRIES."
  (cl-remove-duplicates (mapcar #'guix-entry-to-specification entries)
                        :test #'string=))

(defun guix-get-installed-outputs (entry)
  "Return list of installed outputs for the package ENTRY."
  (mapcar (lambda (installed-entry)
            (guix-get-key-val installed-entry 'output))
          (guix-get-key-val entry 'installed)))

(defun guix-get-entry-by-id (id entries)
  "Return entry from ENTRIES by entry ID."
  (cl-find-if (lambda (entry)
                (equal id (guix-get-key-val entry 'id)))
              entries))

(defun guix-get-package-id-and-output-by-output-id (oid)
  "Return list (PACKAGE-ID OUTPUT) by output id OID."
  (cl-multiple-value-bind (pid-str output)
      (split-string oid ":")
    (let ((pid (string-to-number pid-str)))
      (list (if (= 0 pid) pid-str pid)
            output))))


;;; Location of the packages

(defvar guix-directory nil
  "Default Guix directory.
If it is not set by a user, it is set after starting Guile REPL.
This directory is used to define location of the packages.")

(defun guix-set-directory ()
  "Set `guix-directory' if needed."
  (or guix-directory
      (setq guix-directory
            (guix-eval-read "%guix-dir"))))

(add-hook 'guix-after-start-repl-hook 'guix-set-directory)

(defun guix-find-location (location)
  "Go to LOCATION of a package.
LOCATION is a string of the form:

  \"PATH:LINE:COLUMN\"

If PATH is relative, it is considered to be relative to
`guix-directory'."
  (cl-multiple-value-bind (path line col)
      (split-string location ":")
    (let ((file (expand-file-name path guix-directory))
          (line (string-to-number line))
          (col  (string-to-number col)))
      (find-file file)
      (goto-char (point-min))
      (forward-line (- line 1))
      (move-to-column col)
      (recenter 1))))


;;; Buffers and auto updating.

(defcustom guix-update-after-operation 'current
  "Define what information to update after executing an operation.

After successful executing an operation in the Guix REPL (for
example after installing a package), information in Guix buffers
will or will not be automatically updated depending on a value of
this variable.

If nil, update nothing (do not revert any buffer).
If `current', update the buffer from which an operation was performed.
If `all', update all Guix buffers (not recommended)."
  :type '(choice (const :tag "Do nothing" nil)
                 (const :tag "Update operation buffer" current)
                 (const :tag "Update all Guix buffers" all))
  :group 'guix)

(defcustom guix-buffer-name-function #'guix-buffer-name-default
  "Function used to define name of a buffer for displaying information.
The function is called with 4 arguments: PROFILE, BUFFER-TYPE,
ENTRY-TYPE, SEARCH-TYPE.  See `guix-get-entries' for the meaning
of the arguments."
  :type '(choice (function-item guix-buffer-name-default)
                 (function-item guix-buffer-name-simple)
                 (function :tag "Other function"))
  :group 'guix)

(defun guix-buffer-name-simple (_profile buffer-type entry-type
                                &optional _search-type)
  "Return name of a buffer used for displaying information.
The name is defined by `guix-ENTRY-TYPE-BUFFER-TYPE-buffer-name'
variable."
  (symbol-value
   (guix-get-symbol "buffer-name" buffer-type entry-type)))

(defun guix-buffer-name-default (profile buffer-type entry-type
                                 &optional _search-type)
  "Return name of a buffer used for displaying information.
The name is almost the same as the one defined by
`guix-buffer-name-simple' except the PROFILE name is added to it."
  (let ((simple-name (guix-buffer-name-simple
                      profile buffer-type entry-type))
        (profile-name (file-name-base (directory-file-name profile)))
        (re (rx string-start
                (group (? "*"))
                (group (*? any))
                (group (? "*"))
                string-end)))
    (or (string-match re simple-name)
        (error "Unexpected error in defining guix buffer name"))
    (let ((first*    (match-string 1 simple-name))
          (name-body (match-string 2 simple-name))
          (last*     (match-string 3 simple-name)))
      ;; Handle the case when buffer name is wrapped by '*'.
      (if (and (string= "*" first*)
               (string= "*" last*))
          (concat "*" name-body ": " profile-name "*")
        (concat simple-name ": " profile-name)))))

(defun guix-buffer-name (profile buffer-type entry-type search-type)
  "Return name of a buffer used for displaying information.
See `guix-buffer-name-function' for details."
  (let ((fun (if (functionp guix-buffer-name-function)
                 guix-buffer-name-function
               #'guix-buffer-name-default)))
    (funcall fun profile buffer-type entry-type search-type)))

(defun guix-switch-to-buffer (buffer)
  "Switch to a 'list' or 'info' BUFFER."
  (pop-to-buffer buffer
                 '((display-buffer-reuse-window
                    display-buffer-same-window))))

(defun guix-list-or-info-buffer-p (&optional buffer)
  "Return non-nil if BUFFER is a Guix 'list' or 'info' buffer.
If BUFFER is nil, check current buffer."
  (with-current-buffer (or buffer (current-buffer))
    (derived-mode-p 'guix-list-mode 'guix-info-mode)))

(defun guix-buffers ()
  "Return list of all Guix 'list' and 'info' buffers."
  (cl-remove-if-not #'guix-list-or-info-buffer-p
                    (buffer-list)))

(defun guix-update-buffers-maybe ()
  "Update buffers after Guix operation if needed.
See `guix-update-after-operation' for details."
  (let ((to-update (and guix-operation-buffer
                        (cl-case guix-update-after-operation
                          (current (list guix-operation-buffer))
                          (all     (guix-buffers))))))
    (setq guix-operation-buffer nil)
    (mapc (lambda (buf)
            (and (buffer-live-p buf)
                 (guix-list-or-info-buffer-p buf)
                 (with-current-buffer buf
                   (guix-revert-buffer nil t))))
          to-update)))

(add-hook 'guix-after-repl-operation-hook 'guix-update-buffers-maybe)


;;; Common definitions for buffer types

(defvar-local guix-profile nil
  "Profile used for the current buffer.")
(put 'guix-profile 'permanent-local t)

(defvar-local guix-entries nil
  "List of the currently displayed entries.
Each element of the list is alist with entry info of the
following form:

  ((PARAM . VAL) ...)

PARAM is a name of the entry parameter.
VAL is a value of this parameter.")
(put 'guix-entries 'permanent-local t)

(defvar-local guix-buffer-type nil
  "Type of the current buffer.")
(put 'guix-buffer-type 'permanent-local t)

(defvar-local guix-entry-type nil
  "Type of the current entry.")
(put 'guix-entry-type 'permanent-local t)

(defvar-local guix-search-type nil
  "Type of the current search.")
(put 'guix-search-type 'permanent-local t)

(defvar-local guix-search-vals nil
  "Values of the current search.")
(put 'guix-search-vals 'permanent-local t)

(defsubst guix-set-vars (profile entries buffer-type entry-type
                         search-type search-vals)
  "Set local variables for the current Guix buffer."
  (setq default-directory profile
        guix-profile      profile
        guix-entries      entries
        guix-buffer-type  buffer-type
        guix-entry-type   entry-type
        guix-search-type  search-type
        guix-search-vals  search-vals))

(defun guix-get-symbol (postfix buffer-type &optional entry-type)
  (intern (concat "guix-"
                  (when entry-type
                    (concat (symbol-name entry-type) "-"))
                  (symbol-name buffer-type) "-" postfix)))

(defmacro guix-define-buffer-type (buf-type entry-type &rest args)
  "Define common for BUF-TYPE buffers for displaying ENTRY-TYPE entries.

In the text below TYPE means ENTRY-TYPE-BUF-TYPE.

This macro defines `guix-TYPE-mode', a custom group and several
user variables.

The following stuff should be defined outside this macro:

  - `guix-BUF-TYPE-mode' - parent mode for the defined mode.

  - `guix-TYPE-mode-initialize' (optional) - function for
  additional mode settings; it is called without arguments.

Remaining argument (ARGS) should have a form [KEYWORD VALUE] ...  The
following keywords are available:

  - `:buffer-name' - default value for the defined
    `guix-TYPE-buffer-name' variable.

  - `:required' - default value for the defined
    `guix-TYPE-required-params' variable.

  - `:history-size' - default value for the defined
    `guix-TYPE-history-size' variable.

  - `:revert' - default value for the defined
    `guix-TYPE-revert-no-confirm' variable."
  (let* ((entry-type-str (symbol-name entry-type))
         (buf-type-str   (symbol-name buf-type))
         (Entry-type-str (capitalize entry-type-str))
         (Buf-type-str   (capitalize buf-type-str))
         (entry-str      (concat entry-type-str " entries"))
         (buf-str        (concat buf-type-str " buffer"))
         (prefix         (concat "guix-" entry-type-str "-" buf-type-str))
         (group          (intern prefix))
         (mode-map-str   (concat prefix "-mode-map"))
         (mode-map       (intern mode-map-str))
         (parent-mode    (intern (concat "guix-" buf-type-str "-mode")))
         (mode           (intern (concat prefix "-mode")))
         (mode-init-fun  (intern (concat prefix "-mode-initialize")))
         (buf-name-var   (intern (concat prefix "-buffer-name")))
         (revert-var     (intern (concat prefix "-revert-no-confirm")))
         (history-var    (intern (concat prefix "-history-size")))
         (params-var     (intern (concat prefix "-required-params")))
         (buf-name-val   (format "*Guix %s %s*" Entry-type-str Buf-type-str))
         (revert-val     nil)
         (history-val    20)
         (params-val     '(id)))

    ;; Process the keyword args.
    (while (keywordp (car args))
      (pcase (pop args)
	(`:required     (setq params-val (pop args)))
	(`:history-size (setq history-val (pop args)))
	(`:revert       (setq revert-val (pop args)))
        (`:buffer-name  (setq buf-name-val (pop args)))
	(_ (pop args))))

    `(progn
       (defgroup ,group nil
         ,(concat Buf-type-str " buffer with " entry-str ".")
         :prefix ,(concat prefix "-")
         :group ',(intern (concat "guix-" buf-type-str)))

       (defcustom ,buf-name-var ,buf-name-val
         ,(concat "Default name of the " buf-str " for displaying " entry-str ".")
         :type 'string
         :group ',group)

       (defcustom ,history-var ,history-val
         ,(concat "Maximum number of items saved in the history of the " buf-str ".\n"
                  "If 0, the history is disabled.")
         :type 'integer
         :group ',group)

       (defcustom ,revert-var ,revert-val
         ,(concat "If non-nil, do not ask to confirm for reverting the " buf-str ".")
         :type 'boolean
         :group ',group)

       (defvar ,params-var ',params-val
         ,(concat "List of required " entry-type-str " parameters.\n\n"
                  "Displayed parameters and parameters from this list are received\n"
                  "for each " entry-type-str ".\n\n"
                  "May be a special value `all', in which case all supported\n"
                  "parameters are received (this may be very slow for a big number\n"
                  "of entries).\n\n"
                  "Do not remove `id' from this list as it is required for\n"
                  "identifying an entry."))

       (define-derived-mode ,mode ,parent-mode ,(concat "Guix-" Buf-type-str)
         ,(concat "Major mode for displaying information about " entry-str ".\n\n"
                  "\\{" mode-map-str "}")
         (setq-local revert-buffer-function 'guix-revert-buffer)
         (setq-local guix-history-size ,history-var)
         (and (fboundp ',mode-init-fun) (,mode-init-fun)))

       (let ((map ,mode-map))
         (define-key map (kbd "l") 'guix-history-back)
         (define-key map (kbd "r") 'guix-history-forward)
         (define-key map (kbd "g") 'revert-buffer)
         (define-key map (kbd "R") 'guix-redisplay-buffer)
         (define-key map (kbd "C-c C-z") 'guix-switch-to-repl)))))

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


;;; Getting and displaying info about packages and generations

(defcustom guix-package-list-type 'output
  "Define how to display packages in a list buffer.
May be a symbol `package' or `output' (if `output', display each
output on a separate line; if `package', display each package on
a separate line)."
  :type '(choice (const :tag "List of packages" package)
                 (const :tag "List of outputs" output))
  :group 'guix)

(defcustom guix-package-info-type 'package
  "Define how to display packages in an info buffer.
May be a symbol `package' or `output' (if `output', display each
output separately; if `package', display outputs inside a package
information)."
  :type '(choice (const :tag "Display packages" package)
                 (const :tag "Display outputs" output))
  :group 'guix)

(defun guix-get-entries (profile entry-type search-type search-vals
                         &optional params)
  "Search for entries of ENTRY-TYPE.

Call an appropriate scheme function and return a list of the
form of `guix-entries'.

ENTRY-TYPE should be one of the following symbols: `package',
`output' or `generation'.

SEARCH-TYPE may be one of the following symbols:

- If ENTRY-TYPE is `package' or `output': `id', `name', `regexp',
  `all-available', `newest-available', `installed', `obsolete',
  `generation'.

- If ENTRY-TYPE is `generation': `id', `last', `all', `time'.

PARAMS is a list of parameters for receiving.  If nil, get
information with all available parameters."
  (guix-eval-read (guix-make-guile-expression
                   'entries
                   profile params entry-type search-type search-vals)))

(defun guix-get-show-entries (profile buffer-type entry-type search-type
                              &rest search-vals)
  "Search for ENTRY-TYPE entries and show results in BUFFER-TYPE buffer.
See `guix-get-entries' for the meaning of SEARCH-TYPE and SEARCH-VALS."
  (let ((entries (guix-get-entries profile entry-type search-type search-vals
                                   (guix-get-params-for-receiving
                                    buffer-type entry-type))))
    (guix-set-buffer profile entries buffer-type entry-type
                     search-type search-vals)))

(defun guix-set-buffer (profile entries buffer-type entry-type search-type
                        search-vals &optional history-replace no-display)
  "Set up BUFFER-TYPE buffer for displaying ENTRY-TYPE ENTRIES.

Insert ENTRIES in buffer, set variables and make history item.
ENTRIES should have a form of `guix-entries'.

See `guix-get-entries' for the meaning of SEARCH-TYPE and SEARCH-VALS.

If HISTORY-REPLACE is non-nil, replace current history item,
otherwise add the new one.

If NO-DISPLAY is non-nil, do not switch to the buffer."
  (when entries
    (let ((buf (if (and (eq major-mode
                            (guix-get-symbol "mode" buffer-type entry-type))
                        (equal guix-profile profile))
                   (current-buffer)
                 (get-buffer-create
                  (guix-buffer-name profile buffer-type
                                    entry-type search-type)))))
      (with-current-buffer buf
        (guix-show-entries entries buffer-type entry-type)
        (guix-set-vars profile entries buffer-type entry-type
                       search-type search-vals)
        (funcall (if history-replace
                     #'guix-history-replace
                   #'guix-history-add)
                 (guix-make-history-item)))
      (or no-display
          (guix-switch-to-buffer buf))))
  (guix-result-message entries entry-type search-type search-vals))

(defun guix-show-entries (entries buffer-type entry-type)
  "Display ENTRY-TYPE ENTRIES in the current BUFFER-TYPE buffer."
  (let ((inhibit-read-only t))
    (erase-buffer)
    (funcall (symbol-function (guix-get-symbol
                               "mode" buffer-type entry-type)))
    (funcall (guix-get-symbol "insert-entries" buffer-type)
             entries entry-type)
    (goto-char (point-min))))

(defun guix-history-call (profile entries buffer-type entry-type
                          search-type search-vals)
  "Function called for moving by history."
  (guix-show-entries entries buffer-type entry-type)
  (guix-set-vars profile entries buffer-type entry-type
                 search-type search-vals)
  (guix-result-message entries entry-type search-type search-vals))

(defun guix-make-history-item ()
  "Make and return a history item for the current buffer."
  (list #'guix-history-call
        guix-profile guix-entries guix-buffer-type guix-entry-type
        guix-search-type guix-search-vals))

(defun guix-get-params-for-receiving (buffer-type entry-type)
  "Return parameters that should be received for BUFFER-TYPE, ENTRY-TYPE."
  (let* ((required-var (guix-get-symbol "required-params"
                                        buffer-type entry-type))
         (required (symbol-value required-var)))
    (unless (equal required 'all)
      (cl-union required
                (funcall (guix-get-symbol "get-displayed-params"
                                          buffer-type)
                         entry-type)))))

(defun guix-revert-buffer (_ignore-auto noconfirm)
  "Update information in the current buffer.
The function is suitable for `revert-buffer-function'.
See `revert-buffer' for the meaning of NOCONFIRM."
  (when (or noconfirm
            (symbol-value
             (guix-get-symbol "revert-no-confirm"
                              guix-buffer-type guix-entry-type))
            (y-or-n-p "Update current information? "))
    (let* ((search-type guix-search-type)
           (search-vals guix-search-vals)
           (params (guix-get-params-for-receiving guix-buffer-type
                                                  guix-entry-type))
           (entries (guix-get-entries
                     guix-profile guix-entry-type
                     guix-search-type guix-search-vals params))
           ;; If a REPL was restarted, package/output IDs are not actual
           ;; anymore, because 'object-address'-es died with the REPL, so if a
           ;; search by ID didn't give results, search again by name.
           (entries (if (and (null entries)
                             (eq guix-search-type 'id)
                             (or (eq guix-entry-type 'package)
                                 (eq guix-entry-type 'output)))
                        (progn
                          (setq search-type 'name
                                search-vals (guix-entries-to-specifications
                                             guix-entries))
                          (guix-get-entries
                           guix-profile guix-entry-type
                           search-type search-vals params))
                      entries)))
      (guix-set-buffer guix-profile entries guix-buffer-type guix-entry-type
                       search-type search-vals t t))))

(defun guix-redisplay-buffer ()
  "Redisplay current information.
This function will not update the information, use
\"\\[revert-buffer]\" if you want the full update."
  (interactive)
  (guix-show-entries guix-entries guix-buffer-type guix-entry-type)
  (guix-result-message guix-entries guix-entry-type
                       guix-search-type guix-search-vals))


;;; Messages

(defvar guix-messages
  '((package
     (id
      (0 "Packages not found.")
      (1 "")
      (many "%d packages." count))
     (name
      (0 "The package '%s' not found." val)
      (1 "A single package with name '%s'." val)
      (many "%d packages with '%s' name." count val))
     (regexp
      (0 "No packages matching '%s'." val)
      (1 "A single package matching '%s'." val)
      (many "%d packages matching '%s'." count val))
     (all-available
      (0 "No packages are available for some reason.")
      (1 "A single available package (that's strange).")
      (many "%d available packages." count))
     (newest-available
      (0 "No packages are available for some reason.")
      (1 "A single newest available package (that's strange).")
      (many "%d newest available packages." count))
     (installed
      (0 "No installed packages.")
      (1 "A single package installed.")
      (many "%d packages installed." count))
     (obsolete
      (0 "No obsolete packages.")
      (1 "A single obsolete package.")
      (many "%d obsolete packages." count))
     (generation
      (0 "No packages installed in generation %d." val)
      (1 "A single package installed in generation %d." val)
      (many "%d packages installed in generation %d." count val)))
    (output
     (id
      (0 "Package outputs not found.")
      (1 "")
      (many "%d package outputs." count))
     (name
      (0 "The package output '%s' not found." val)
      (1 "A single package output with name '%s'." val)
      (many "%d package outputs with '%s' name." count val))
     (regexp
      (0 "No package outputs matching '%s'." val)
      (1 "A single package output matching '%s'." val)
      (many "%d package outputs matching '%s'." count val))
     (all-available
      (0 "No package outputs are available for some reason.")
      (1 "A single available package output (that's strange).")
      (many "%d available package outputs." count))
     (newest-available
      (0 "No package outputs are available for some reason.")
      (1 "A single newest available package output (that's strange).")
      (many "%d newest available package outputs." count))
     (installed
      (0 "No installed package outputs.")
      (1 "A single package output installed.")
      (many "%d package outputs installed." count))
     (obsolete
      (0 "No obsolete package outputs.")
      (1 "A single obsolete package output.")
      (many "%d obsolete package outputs." count))
     (generation
      (0 "No package outputs installed in generation %d." val)
      (1 "A single package output installed in generation %d." val)
      (many "%d package outputs installed in generation %d." count val)))
    (generation
     (id
      (0 "Generations not found.")
      (1 "")
      (many "%d generations." count))
     (last
      (0 "No available generations.")
      (1 "The last generation.")
      (many "%d last generations." count))
     (all
      (0 "No available generations.")
      (1 "A single available generation.")
      (many "%d available generations." count))
     (time
      (0 "Generations not found.")
      (1 "A single generation matching time period.")
      (many "%d generations matching time period." count)))))

(defun guix-result-message (entries entry-type search-type search-vals)
  "Display an appropriate message after displaying ENTRIES."
  (let* ((val (car search-vals))
         (count (length entries))
         (count-key (if (> count 1) 'many count))
         (msg-spec (guix-get-key-val guix-messages
                                     entry-type search-type count-key))
         (format (car msg-spec))
         (args (cdr msg-spec)))
    (mapc (lambda (subst)
            (setq args (cl-substitute (car subst) (cdr subst) args)))
          (list (cons count 'count)
                (cons val 'val)))
    (apply #'message format args)))


;;; Actions on packages and generations

(defface guix-operation-option-key
  '((t :inherit font-lock-warning-face))
  "Face used for the keys of operation options."
  :group 'guix)

(defcustom guix-operation-confirm t
  "If nil, do not prompt to confirm an operation."
  :type 'boolean
  :group 'guix)

(defcustom guix-use-substitutes t
  "If non-nil, use substitutes for the Guix packages."
  :type 'boolean
  :group 'guix)

(defvar guix-dry-run nil
  "If non-nil, do not perform the real actions, just simulate.")

(defvar guix-temp-buffer-name " *Guix temp*"
  "Name of a buffer used for displaying info before executing operation.")

(defvar guix-operation-option-true-string "yes"
  "String displayed in the mode-line when operation option is t.")

(defvar guix-operation-option-false-string "no "
  "String displayed in the mode-line when operation option is nil.")

(defvar guix-operation-option-separator "  |  "
  "String used in the mode-line to separate operation options.")

(defvar guix-operation-options
  '((?s "substitutes" guix-use-substitutes)
    (?d "dry-run"     guix-dry-run))
  "List of available operation options.
Each element of the list has a form:

  (KEY NAME VARIABLE)

KEY is a character that may be pressed during confirmation to
toggle the option.
NAME is a string displayed in the mode-line.
VARIABLE is a name of an option variable.")

(defun guix-operation-option-by-key (key)
  "Return operation option by KEY (character)."
  (assq key guix-operation-options))

(defun guix-operation-option-key (option)
  "Return key (character) of the operation OPTION."
  (car option))

(defun guix-operation-option-name (option)
  "Return name of the operation OPTION."
  (nth 1 option))

(defun guix-operation-option-variable (option)
  "Return name of the variable of the operation OPTION."
  (nth 2 option))

(defun guix-operation-option-value (option)
  "Return boolean value of the operation OPTION."
  (symbol-value (guix-operation-option-variable option)))

(defun guix-operation-option-string-value (option)
  "Convert boolean value of the operation OPTION to string and return it."
  (if (guix-operation-option-value option)
      guix-operation-option-true-string
    guix-operation-option-false-string))

(defun guix-process-package-actions (profile actions
                                     &optional operation-buffer)
  "Process package ACTIONS on PROFILE.
Each action is a list of the form:

  (ACTION-TYPE PACKAGE-SPEC ...)

ACTION-TYPE is one of the following symbols: `install',
`upgrade', `remove'/`delete'.
PACKAGE-SPEC should have the following form: (ID [OUTPUT] ...)."
  (let (install upgrade remove)
    (mapc (lambda (action)
            (let ((action-type (car action))
                  (specs (cdr action)))
              (cl-case action-type
                (install (setq install (append install specs)))
                (upgrade (setq upgrade (append upgrade specs)))
                ((remove delete) (setq remove (append remove specs))))))
          actions)
    (when (guix-continue-package-operation-p
           profile
           :install install :upgrade upgrade :remove remove)
      (guix-eval-in-repl
       (guix-make-guile-expression
        'process-package-actions profile
        :install install :upgrade upgrade :remove remove
        :use-substitutes? (or guix-use-substitutes 'f)
        :dry-run? (or guix-dry-run 'f))
       (and (not guix-dry-run) operation-buffer)))))

(cl-defun guix-continue-package-operation-p (profile
                                             &key install upgrade remove)
  "Return non-nil if a package operation should be continued.
Ask a user if needed (see `guix-operation-confirm').
INSTALL, UPGRADE, REMOVE are 'package action specifications'.
See `guix-process-package-actions' for details."
  (or (null guix-operation-confirm)
      (let* ((entries (guix-get-entries
                       profile 'package 'id
                       (append (mapcar #'car install)
                               (mapcar #'car upgrade)
                               (mapcar #'car remove))
                       '(id name version location)))
             (install-strings (guix-get-package-strings install entries))
             (upgrade-strings (guix-get-package-strings upgrade entries))
             (remove-strings  (guix-get-package-strings remove entries)))
        (if (or install-strings upgrade-strings remove-strings)
            (let ((buf (get-buffer-create guix-temp-buffer-name)))
              (with-current-buffer buf
                (setq-local cursor-type nil)
                (setq buffer-read-only nil)
                (erase-buffer)
                (insert "Profile: " profile "\n\n")
                (guix-insert-package-strings install-strings "install")
                (guix-insert-package-strings upgrade-strings "upgrade")
                (guix-insert-package-strings remove-strings "remove")
                (let ((win (temp-buffer-window-show
                            buf
                            '((display-buffer-reuse-window
                               display-buffer-at-bottom)
                              (window-height . fit-window-to-buffer)))))
                  (prog1 (guix-operation-prompt)
                    (quit-window nil win)))))
          (message "Nothing to be done.  If the REPL was restarted, information is not up-to-date.")
          nil))))

(defun guix-get-package-strings (specs entries)
  "Return short package descriptions for performing package actions.
See `guix-process-package-actions' for the meaning of SPECS.
ENTRIES is a list of package entries to get info about packages."
  (delq nil
        (mapcar
         (lambda (spec)
           (let* ((id (car spec))
                  (outputs (cdr spec))
                  (entry (guix-get-entry-by-id id entries)))
             (when entry
               (let ((location (guix-get-key-val entry 'location)))
                 (concat (guix-get-full-name entry)
                         (when outputs
                           (concat ":"
                                   (mapconcat #'identity outputs ",")))
                         (when location
                           (concat "\t(" location ")")))))))
         specs)))

(defun guix-insert-package-strings (strings action)
  "Insert information STRINGS at point for performing package ACTION."
  (when strings
    (insert "Package(s) to " (propertize action 'face 'bold) ":\n")
    (mapc (lambda (str)
            (insert "  " str "\n"))
          strings)
    (insert "\n")))

(defun guix-operation-prompt ()
  "Prompt a user for continuing the current package operation.
Return non-nil, if the operation should be continued; nil otherwise."
  (let* ((option-keys (mapcar #'guix-operation-option-key
                              guix-operation-options))
         (keys (append '(?y ?n) option-keys))
         (prompt (concat (propertize "Continue operation?"
                                     'face 'minibuffer-prompt)
                         " ("
                         (mapconcat
                          (lambda (key)
                            (propertize (string key)
                                        'face 'guix-operation-option-key))
                          keys
                          ", ")
                         ") ")))
    (prog1 (guix-operation-prompt-1 prompt keys)
      ;; Clear the minibuffer after prompting.
      (message ""))))

(defun guix-operation-prompt-1 (prompt keys)
  "This function is internal for `guix-operation-prompt'."
  (guix-operation-set-mode-line)
  (let ((key (read-char-choice prompt (cons ?\C-g keys) t)))
    (cl-case key
      (?y t)
      ((?n ?\C-g) nil)
      (t (let* ((option (guix-operation-option-by-key key))
                (var (guix-operation-option-variable option)))
           (set var (not (symbol-value var)))
           (guix-operation-prompt-1 prompt keys))))))

(defun guix-operation-set-mode-line ()
  "Display operation options in the mode-line of the current buffer."
  (setq mode-line-format
        (concat (propertize " Options:   "
                            'face 'mode-line-buffer-id)
                (mapconcat
                 (lambda (option)
                   (let ((key  (guix-operation-option-key option))
                         (name (guix-operation-option-name option))
                         (val  (guix-operation-option-string-value option)))
                     (concat name
                             " ("
                             (propertize (string key)
                                         'face 'guix-operation-option-key)
                             "): " val)))
                 guix-operation-options
                 guix-operation-option-separator)))
  (force-mode-line-update))

(defun guix-delete-generations (profile generations
                                &optional operation-buffer)
  "Delete GENERATIONS from PROFILE.
Each element from GENERATIONS is a generation number."
  (when (or (not guix-operation-confirm)
            (y-or-n-p
             (let ((count (length generations)))
               (if (> count 1)
                   (format "Delete %d generations from profile '%s'? "
                           count profile)
                 (format "Delete generation %d from profile '%s'? "
                         (car generations) profile)))))
    (guix-eval-in-repl
     (guix-make-guile-expression
      'delete-generations* profile generations)
     operation-buffer)))

(defun guix-switch-to-generation (profile generation
                                  &optional operation-buffer)
  "Switch PROFILE to GENERATION."
  (when (or (not guix-operation-confirm)
            (y-or-n-p (format "Switch profile '%s' to generation %d? "
                              profile generation)))
    (guix-eval-in-repl
     (guix-make-guile-expression
      'switch-to-generation profile generation)
     operation-buffer)))

(provide 'guix-base)

;;; guix-base.el ends here