aboutsummaryrefslogtreecommitdiff
path: root/emacs/guix-info.el
blob: 80443f2e402dc7a8ebfc2fde00445f667f6d16bd (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
;;; guix-info.el --- Info buffers for displaying entries   -*- lexical-binding: t -*-

;; Copyright © 2014, 2015 Alex Kost <alezost@gmail.com>
;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>

;; 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 help-like buffer for displaying information
;; about Guix packages and generations.

;;; Code:

(require 'guix-base)
(require 'guix-entry)
(require 'guix-utils)
(require 'guix-ui)

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

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

(defface guix-info-heading
  '((((type tty pc) (class color)) :weight bold)
    (t :height 1.6 :weight bold :inherit variable-pitch))
  "Face for headings."
  :group 'guix-info-faces)

(defface guix-info-param-title
  '((t :inherit font-lock-type-face))
  "Face used for titles of parameters."
  :group 'guix-info-faces)

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

(defface guix-info-url
  '((t :inherit link))
  "Face used for URLs."
  :group 'guix-info-faces)

(defface guix-info-time
  '((t :inherit font-lock-constant-face))
  "Face used for timestamps."
  :group 'guix-info-faces)

(defface guix-info-action-button
  '((((type x w32 ns) (class color))
     :box (:line-width 2 :style released-button)
     :background "lightgrey" :foreground "black")
    (t :inherit button))
  "Face used for action buttons."
  :group 'guix-info-faces)

(defface guix-info-action-button-mouse
  '((((type x w32 ns) (class color))
     :box (:line-width 2 :style released-button)
     :background "grey90" :foreground "black")
    (t :inherit highlight))
  "Mouse face used for action buttons."
  :group 'guix-info-faces)

(defcustom guix-info-ignore-empty-values nil
  "If non-nil, do not display parameters with nil values."
  :type 'boolean
  :group 'guix-info)

(defcustom guix-info-fill t
  "If non-nil, fill string parameters to fit the window.
If nil, insert text parameters (like synopsis or description) in
a raw form."
  :type 'boolean
  :group 'guix-info)

(defvar guix-info-param-title-format "%-18s: "
  "String used to format a title of a parameter.
It should be a '%s'-sequence.  After inserting a title formatted
with this string, a value of the parameter is inserted.
This string is used by `guix-info-insert-title-format'.")

(defvar guix-info-multiline-prefix
  (make-string (length (format guix-info-param-title-format " "))
               ?\s)
  "String used to format multi-line parameter values.
If a value occupies more than one line, this string is inserted
in the beginning of each line after the first one.
This string is used by `guix-info-insert-value-format'.")

(defvar guix-info-indent 2
  "Number of spaces used to indent various parts of inserted text.")

(defvar guix-info-delimiter "\n\f\n"
  "String used to separate entries.")


;;; Wrappers for 'info' variables

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

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

(defun guix-info-param-title (entry-type param)
  "Return a title of an ENTRY-TYPE parameter PARAM."
  (guix-buffer-param-title 'info entry-type param))

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

(defun guix-info-displayed-params (entry-type)
  "Return a list of ENTRY-TYPE parameters that should be displayed."
  (delq nil
        (mapcar (lambda (spec)
                  (pcase spec
                    (`(,param . ,_) param)))
                (guix-info-format entry-type))))


;;; Inserting entries

(defvar guix-info-title-aliases
  '((format . guix-info-insert-title-format)
    (simple . guix-info-insert-title-simple))
  "Alist of aliases and functions to insert titles.")

(defvar guix-info-value-aliases
  '((format . guix-info-insert-value-format)
    (indent . guix-info-insert-value-indent)
    (simple . guix-info-insert-value-simple)
    (time   . guix-info-insert-time))
  "Alist of aliases and functions to insert values.")

(defun guix-info-title-function (fun-or-alias)
  "Convert FUN-OR-ALIAS into a function to insert a title."
  (or (guix-assq-value guix-info-title-aliases fun-or-alias)
      fun-or-alias))

(defun guix-info-value-function (fun-or-alias)
  "Convert FUN-OR-ALIAS into a function to insert a value."
  (or (guix-assq-value guix-info-value-aliases fun-or-alias)
      fun-or-alias))

(defun guix-info-title-method->function (method)
  "Convert title METHOD into a function to insert a title."
  (pcase method
    ((pred null) #'ignore)
    ((pred symbolp) (guix-info-title-function method))
    (`(,fun-or-alias . ,rest-args)
     (lambda (title)
       (apply (guix-info-title-function fun-or-alias)
              title rest-args)))
    (_ (error "Unknown title method '%S'" method))))

(defun guix-info-value-method->function (method)
  "Convert value METHOD into a function to insert a value."
  (pcase method
    ((pred null) #'ignore)
    ((pred functionp) method)
    (`(,fun-or-alias . ,rest-args)
     (lambda (value _)
       (apply (guix-info-value-function fun-or-alias)
              value rest-args)))
    (_ (error "Unknown value method '%S'" method))))

(defun guix-info-fill-column ()
  "Return fill column for the current window."
  (min (window-width) fill-column))

(defun guix-info-get-indent (&optional level)
  "Return `guix-info-indent' \"multiplied\" by LEVEL spaces.
LEVEL is 1 by default."
  (make-string (* guix-info-indent (or level 1)) ?\s))

(defun guix-info-insert-indent (&optional level)
  "Insert `guix-info-indent' spaces LEVEL times (1 by default)."
  (insert (guix-info-get-indent level)))

(defun guix-info-insert-entries (entries entry-type)
  "Display ENTRIES of ENTRY-TYPE in the current info buffer.
ENTRIES should have a form of `guix-entries'."
  (guix-mapinsert (lambda (entry)
                    (guix-info-insert-entry entry entry-type))
                  entries
                  guix-info-delimiter))

(defun guix-info-insert-entry (entry entry-type &optional indent-level)
  "Insert ENTRY of ENTRY-TYPE into the current info buffer.
If INDENT-LEVEL is non-nil, indent displayed data by this number
of `guix-info-indent' spaces."
  (guix-with-indent (* (or indent-level 0)
                       guix-info-indent)
    (dolist (spec (guix-info-format entry-type))
      (guix-info-insert-entry-unit spec entry entry-type))))

(defun guix-info-insert-entry-unit (format-spec entry entry-type)
  "Insert title and value of a PARAM at point.
ENTRY is alist with parameters and their values.
ENTRY-TYPE is a type of ENTRY."
  (pcase format-spec
    ((pred functionp)
     (funcall format-spec entry)
     (insert "\n"))
    (`(,param ,title-method ,value-method)
     (let ((value (guix-entry-value entry param)))
       (unless (and guix-info-ignore-empty-values (null value))
         (let ((title        (guix-info-param-title entry-type param))
               (insert-title (guix-info-title-method->function title-method))
               (insert-value (guix-info-value-method->function value-method)))
           (funcall insert-title title)
           (funcall insert-value value entry)
           (insert "\n")))))
    (_ (error "Unknown format specification '%S'" format-spec))))

(defun guix-info-insert-title-simple (title &optional face)
  "Insert \"TITLE: \" string at point.
If FACE is nil, use `guix-info-param-title'."
  (guix-format-insert title
                      (or face 'guix-info-param-title)
                      "%s: "))

(defun guix-info-insert-title-format (title &optional face)
  "Insert TITLE using `guix-info-param-title-format' at point.
If FACE is nil, use `guix-info-param-title'."
  (guix-format-insert title
                      (or face 'guix-info-param-title)
                      guix-info-param-title-format))

(defun guix-info-insert-value-simple (value &optional button-or-face indent)
  "Format and insert parameter VALUE at point.

VALUE may be split into several short lines to fit the current
window, depending on `guix-info-fill', and each line is indented
with INDENT number of spaces.

If BUTTON-OR-FACE is a button type symbol, transform VALUE into
this (these) button(s) and insert each one on a new line.  If it
is a face symbol, propertize inserted line(s) with this face."
  (or indent (setq indent 0))
  (guix-with-indent indent
    (let* ((button?  (guix-button-type? button-or-face))
           (face     (unless button? button-or-face))
           (fill-col (unless (or button?
                                 (and (stringp value)
                                      (not guix-info-fill)))
                       (- (guix-info-fill-column) indent)))
           (value    (if (and value button?)
                         (guix-buttonize value button-or-face "\n")
                       value)))
      (guix-split-insert value face fill-col "\n"))))

(defun guix-info-insert-value-indent (value &optional button-or-face)
  "Format and insert parameter VALUE at point.

This function is intended to be called after inserting a title
with `guix-info-insert-title-simple'.

VALUE may be split into several short lines to fit the current
window, depending on `guix-info-fill', and each line is indented
with `guix-info-indent'.

For the meaning of BUTTON-OR-FACE, see `guix-info-insert-value-simple'."
  (when value (insert "\n"))
  (guix-info-insert-value-simple value button-or-face guix-info-indent))

(defun guix-info-insert-value-format (value &optional button-or-face
                                            &rest button-properties)
  "Format and insert parameter VALUE at point.

This function is intended to be called after inserting a title
with `guix-info-insert-title-format'.

VALUE may be split into several short lines to fit the current
window, depending on `guix-info-fill' and
`guix-info-multiline-prefix'.  If VALUE is a list, its elements
will be separated with `guix-list-separator'.

If BUTTON-OR-FACE is a button type symbol, transform VALUE into
this (these) button(s).  If it is a face symbol, propertize
inserted line(s) with this face.

BUTTON-PROPERTIES are passed to `guix-buttonize' (only if
BUTTON-OR-FACE is a button type)."
  (let* ((button?  (guix-button-type? button-or-face))
         (face     (unless button? button-or-face))
         (fill-col (when (or button?
                             guix-info-fill
                             (not (stringp value)))
                     (- (guix-info-fill-column)
                        (length guix-info-multiline-prefix))))
         (value    (if (and value button?)
                       (apply #'guix-buttonize
                              value button-or-face guix-list-separator
                              button-properties)
                     value)))
    (guix-split-insert value face fill-col
                       (concat "\n" guix-info-multiline-prefix))))

(defun guix-info-insert-time (seconds &optional face)
  "Insert formatted time string using SECONDS at point."
  (guix-format-insert (guix-get-time-string seconds)
                      (or face 'guix-info-time)))


;;; Buttons

(defvar guix-info-button-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map button-map)
    (define-key map (kbd "c") 'guix-info-button-copy-label)
    map)
  "Keymap for buttons in info buffers.")

(define-button-type 'guix
  'keymap guix-info-button-map
  'follow-link t)

(define-button-type 'guix-action
  :supertype 'guix
  'face 'guix-info-action-button
  'mouse-face 'guix-info-action-button-mouse)

(define-button-type 'guix-file
  :supertype 'guix
  'face 'guix-info-file-path
  'help-echo "Find file"
  'action (lambda (btn)
            (guix-find-file (button-label btn))))

(define-button-type 'guix-url
  :supertype 'guix
  'face 'guix-info-url
  'help-echo "Browse URL"
  'action (lambda (btn)
            (browse-url (button-label btn))))

(define-button-type 'guix-package-location
  :supertype 'guix
  'face 'guix-package-info-location
  'help-echo "Find location of this package"
  'action (lambda (btn)
            (guix-find-location (button-label btn))))

(define-button-type 'guix-package-name
  :supertype 'guix
  'face 'guix-package-info-name-button
  'help-echo "Describe this package"
  'action (lambda (btn)
            (guix-get-show-entries guix-profile 'info guix-package-info-type
                                   'name (button-label btn))))

(defun guix-info-button-copy-label (&optional pos)
  "Copy a label of the button at POS into kill ring.
If POS is nil, use the current point position."
  (interactive)
  (let ((button (button-at (or pos (point)))))
    (when button
      (guix-copy-as-kill (button-label button)))))

(defun guix-info-insert-action-button (label action &optional message
                                             &rest properties)
  "Make action button with LABEL and insert it at point.
ACTION is a function called when the button is pressed.  It
should accept button as the argument.
MESSAGE is a button message.
See `insert-text-button' for the meaning of PROPERTIES."
  (apply #'guix-insert-button
         label 'guix-action
         'action action
         'help-echo message
         properties))


;;; Major mode and interface definer

(defvar guix-info-mode-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent
     map (make-composed-keymap (list guix-buffer-map button-buffer-map)
                               special-mode-map))
    map)
  "Keymap for `guix-info-mode' buffers.")

(define-derived-mode guix-info-mode special-mode "Guix-Info"
  "Parent mode for displaying information in info buffers.")

(defmacro guix-info-define-interface (entry-type &rest args)
  "Define 'info' interface for displaying ENTRY-TYPE entries.
Remaining arguments (ARGS) should have a form [KEYWORD VALUE] ...

Required keywords:

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

The rest keyword arguments are passed to
`guix-buffer-define-interface' macro."
  (declare (indent 1))
  (let* ((entry-type-str     (symbol-name entry-type))
         (prefix             (concat "guix-" entry-type-str "-info"))
         (group              (intern prefix))
         (format-var         (intern (concat prefix "-format"))))
    (guix-keyword-args-let args
        ((format-val         :format))
      `(progn
         (defcustom ,format-var ,format-val
           ,(format "\
List of methods for inserting '%s' entry.
Each METHOD should be either a function or should have the
following form:

  (PARAM INSERT-TITLE INSERT-VALUE)

If METHOD is a function, it is called with an entry as argument.

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

INSERT-TITLE may be either a symbol or a list.  If it is a
symbol, it should be a function or an alias from
`guix-info-title-aliases', in which case it is called with title
as argument.  If it is a list, it should have a
form (FUN-OR-ALIAS [ARGS ...]), in which case FUN-OR-ALIAS is
called with title and ARGS as arguments.

INSERT-VALUE may be either a symbol or a list.  If it is a
symbol, it should be a function or an alias from
`guix-info-value-aliases', in which case it is called with value
and entry as arguments.  If it is a list, it should have a
form (FUN-OR-ALIAS [ARGS ...]), in which case FUN-OR-ALIAS is
called with value and ARGS as arguments.

Parameters are inserted in the same order as defined by this list.
After calling each METHOD, a new line is inserted."
                    entry-type-str entry-type-str)
           :type 'sexp
           :group ',group)

         (guix-alist-put!
          '((format . ,format-var))
          'guix-info-data ',entry-type)

         (guix-buffer-define-interface info ,entry-type
           ,@%foreign-args)))))


;;; Displaying packages

(guix-ui-info-define-interface package
  :format '(guix-package-info-insert-heading
            ignore
            (synopsis ignore (simple guix-package-info-synopsis))
            ignore
            (description ignore (simple guix-package-info-description))
            ignore
            (outputs simple guix-package-info-insert-outputs)
            (source simple guix-package-info-insert-source)
            (location format (format guix-package-location))
            (home-url format (format guix-url))
            (license format (format guix-package-info-license))
            (inputs format (format guix-package-input))
            (native-inputs format (format guix-package-native-input))
            (propagated-inputs format
                               (format guix-package-propagated-input)))
  :titles '((home-url . "Home page"))
  :required '(id name version installed non-unique))

(guix-info-define-interface installed-output
  :format '((path simple (indent guix-file))
            (dependencies simple (indent guix-file)))
  :titles '((path . "Store directory"))
  :reduced? t)

(defface guix-package-info-heading
  '((t :inherit guix-info-heading))
  "Face for package name and version headings."
  :group 'guix-package-info-faces)

(defface guix-package-info-name
  '((t :inherit font-lock-keyword-face))
  "Face used for a name of a package."
  :group 'guix-package-info-faces)

(defface guix-package-info-name-button
  '((t :inherit button))
  "Face used for a full name that can be used to describe a package."
  :group 'guix-package-info-faces)

(defface guix-package-info-version
  '((t :inherit font-lock-builtin-face))
  "Face used for a version of a package."
  :group 'guix-package-info-faces)

(defface guix-package-info-synopsis
  '((((type tty pc) (class color)) :weight bold)
    (t :height 1.1 :weight bold :inherit variable-pitch))
  "Face used for a synopsis of a package."
  :group 'guix-package-info-faces)

(defface guix-package-info-description
  '((t))
  "Face used for a description of a package."
  :group 'guix-package-info-faces)

(defface guix-package-info-license
  '((t :inherit font-lock-string-face))
  "Face used for a license of a package."
  :group 'guix-package-info-faces)

(defface guix-package-info-location
  '((t :inherit link))
  "Face used for a location of a package."
  :group 'guix-package-info-faces)

(defface guix-package-info-installed-outputs
  '((default :weight bold)
    (((class color) (min-colors 88) (background light))
     :foreground "ForestGreen")
    (((class color) (min-colors 88) (background dark))
     :foreground "PaleGreen")
    (((class color) (min-colors 8))
     :foreground "green")
    (t :underline t))
  "Face used for installed outputs of a package."
  :group 'guix-package-info-faces)

(defface guix-package-info-uninstalled-outputs
  '((t :weight bold))
  "Face used for uninstalled outputs of a package."
  :group 'guix-package-info-faces)

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

(defun guix-package-info-insert-heading (entry)
  "Insert package ENTRY heading (name specification) at point."
  (guix-insert-button
   (guix-package-entry->name-specification entry)
   'guix-package-name
   'face 'guix-package-info-heading))

(defmacro guix-package-info-define-insert-inputs (&optional type)
  "Define a face and a function for inserting package inputs.
TYPE is a type of inputs.
Function name is `guix-package-info-insert-TYPE-inputs'.
Face name is `guix-package-info-TYPE-inputs'."
  (let* ((type-str (symbol-name type))
         (type-name (and type (concat type-str "-")))
         (type-desc (and type (concat type-str " ")))
         (face (intern (concat "guix-package-info-" type-name "inputs")))
         (btn  (intern (concat "guix-package-" type-name "input"))))
    `(progn
       (defface ,face
         '((t :inherit guix-package-info-name-button))
         ,(concat "Face used for " type-desc "inputs of a package.")
         :group 'guix-package-info-faces)

       (define-button-type ',btn
         :supertype 'guix-package-name
         'face ',face))))

(guix-package-info-define-insert-inputs)
(guix-package-info-define-insert-inputs native)
(guix-package-info-define-insert-inputs propagated)


;;; Inserting outputs and installed parameters

(defvar guix-package-info-output-format "%-10s"
  "String used to format output names of the packages.
It should be a '%s'-sequence.  After inserting an output name
formatted with this string, an action button is inserted.")

(defvar guix-package-info-obsolete-string "(This package is obsolete)"
  "String used if a package is obsolete.")

(defun guix-package-info-insert-outputs (outputs entry)
  "Insert OUTPUTS from package ENTRY at point."
  (and (guix-entry-value entry 'obsolete)
       (guix-package-info-insert-obsolete-text))
  (and (guix-entry-value entry 'non-unique)
       (guix-entry-value entry 'installed)
       (guix-package-info-insert-non-unique-text
        (guix-package-entry->name-specification entry)))
  (insert "\n")
  (mapc (lambda (output)
          (guix-package-info-insert-output output entry))
        outputs))

(defun guix-package-info-insert-obsolete-text ()
  "Insert a message about obsolete package at point."
  (guix-info-insert-indent)
  (guix-format-insert guix-package-info-obsolete-string
                      'guix-package-info-obsolete))

(defun guix-package-info-insert-non-unique-text (full-name)
  "Insert a message about non-unique package with FULL-NAME at point."
  (insert "\n")
  (guix-info-insert-indent)
  (insert "Installed outputs are displayed for a non-unique ")
  (guix-insert-button full-name 'guix-package-name)
  (insert " package."))

(defun guix-package-info-insert-output (output entry)
  "Insert OUTPUT at point.
Make some fancy text with buttons and additional stuff if the
current OUTPUT is installed (if there is such output in
`installed' parameter of a package ENTRY)."
  (let* ((installed (guix-entry-value entry 'installed))
         (obsolete  (guix-entry-value entry 'obsolete))
         (installed-entry (cl-find-if
                           (lambda (entry)
                             (string= (guix-entry-value entry 'output)
                                      output))
                           installed))
         (action-type (if installed-entry 'delete 'install)))
    (guix-info-insert-indent)
    (guix-format-insert output
                        (if installed-entry
                            'guix-package-info-installed-outputs
                          'guix-package-info-uninstalled-outputs)
                        guix-package-info-output-format)
    (guix-package-info-insert-action-button action-type entry output)
    (when obsolete
      (guix-info-insert-indent)
      (guix-package-info-insert-action-button 'upgrade entry output))
    (insert "\n")
    (when installed-entry
      (guix-info-insert-entry installed-entry 'installed-output 2))))

(defun guix-package-info-insert-action-button (type entry output)
  "Insert button to process an action on a package OUTPUT at point.
TYPE is one of the following symbols: `install', `delete', `upgrade'.
ENTRY is an alist with package info."
  (let ((type-str (capitalize (symbol-name type)))
        (full-name (guix-package-entry->name-specification entry output)))
    (guix-info-insert-action-button
     type-str
     (lambda (btn)
       (guix-process-package-actions
        guix-profile
        `((,(button-get btn 'action-type) (,(button-get btn 'id)
                                           ,(button-get btn 'output))))
        (current-buffer)))
     (concat type-str " '" full-name "'")
     'action-type type
     'id (or (guix-entry-value entry 'package-id)
             (guix-entry-id entry))
     'output output)))


;;; Inserting a source

(defface guix-package-info-source
  '((t :inherit link :underline nil))
  "Face used for a source URL of a package."
  :group 'guix-package-info-faces)

(defcustom guix-package-info-auto-find-source nil
  "If non-nil, find a source file after pressing a \"Show\" button.
If nil, just display the source file path without finding."
  :type 'boolean
  :group 'guix-package-info)

(defcustom guix-package-info-auto-download-source t
  "If nil, do not automatically download a source file if it doesn't exist.
After pressing a \"Show\" button, a derivation of the package
source is calculated and a store file path is displayed.  If this
variable is non-nil and the source file does not exist in the
store, it will be automatically downloaded (with a possible
prompt depending on `guix-operation-confirm' variable)."
  :type 'boolean
  :group 'guix-package-info)

(defvar guix-package-info-download-buffer nil
  "Buffer from which a current download operation was performed.")

(define-button-type 'guix-package-source
  :supertype 'guix
  'face 'guix-package-info-source
  'help-echo ""
  'action (lambda (_)
            ;; As a source may not be a real URL (e.g., "mirror://..."),
            ;; no action is bound to a source button.
            (message "Yes, this is the source URL. What did you expect?")))

(defun guix-package-info-show-source (entry-id package-id)
  "Show file name of a package source in the current info buffer.
Find the file if needed (see `guix-package-info-auto-find-source').
ENTRY-ID is an ID of the current entry (package or output).
PACKAGE-ID is an ID of the package which source to show."
  (let* ((entries guix-entries)
         (entry   (guix-entry-by-id entry-id guix-entries))
         (file    (guix-package-source-path package-id)))
    (or file
        (error "Couldn't define file name of the package source"))
    (let* ((new-entry (cons (cons 'source-file file)
                            entry))
           (new-entries (guix-replace-entry entry-id new-entry entries)))
      (setq guix-entries new-entries)
      (guix-buffer-redisplay-goto-button)
      (if (file-exists-p file)
          (if guix-package-info-auto-find-source
              (guix-find-file file)
            (message "The source store path is displayed."))
        (if guix-package-info-auto-download-source
            (guix-package-info-download-source package-id)
          (message "The source does not exist in the store."))))))

(defun guix-package-info-download-source (package-id)
  "Download a source of the package PACKAGE-ID."
  (setq guix-package-info-download-buffer (current-buffer))
  (guix-package-source-build-derivation
   package-id
   "The source does not exist in the store. Download it?"))

(defun guix-package-info-insert-source (source entry)
  "Insert SOURCE from package ENTRY at point.
SOURCE is a list of URLs."
  (if (null source)
      (guix-format-insert nil)
    (let* ((source-file (guix-entry-value entry 'source-file))
           (entry-id    (guix-entry-id entry))
           (package-id  (or (guix-entry-value entry 'package-id)
                            entry-id)))
      (if (null source-file)
          (guix-info-insert-action-button
           "Show"
           (lambda (btn)
             (guix-package-info-show-source (button-get btn 'entry-id)
                                            (button-get btn 'package-id)))
           "Show the source store directory of the current package"
           'entry-id entry-id
           'package-id package-id)
        (unless (file-exists-p source-file)
          (guix-info-insert-action-button
           "Download"
           (lambda (btn)
             (guix-package-info-download-source
              (button-get btn 'package-id)))
           "Download the source into the store"
           'package-id package-id))
        (guix-info-insert-value-indent source-file 'guix-file))
      (guix-info-insert-value-indent source 'guix-package-source))))

(defun guix-package-info-redisplay-after-download ()
  "Redisplay an 'info' buffer after downloading the package source.
This function is used to hide a \"Download\" button if needed."
  (when (buffer-live-p guix-package-info-download-buffer)
    (with-current-buffer guix-package-info-download-buffer
      (guix-buffer-redisplay-goto-button))
    (setq guix-package-info-download-buffer nil)))

(add-hook 'guix-after-source-download-hook
          'guix-package-info-redisplay-after-download)


;;; Displaying outputs

(guix-ui-info-define-interface output
  :buffer-name "*Guix Package Info*"
  :format '((name format (format guix-package-info-name))
            (version format guix-output-info-insert-version)
            (output format guix-output-info-insert-output)
            (synopsis simple (indent guix-package-info-synopsis))
            (source simple guix-package-info-insert-source)
            (path simple (indent guix-file))
            (dependencies simple (indent guix-file))
            (location format (format guix-package-location))
            (home-url format (format guix-url))
            (license format (format guix-package-info-license))
            (inputs format (format guix-package-input))
            (native-inputs format (format guix-package-native-input))
            (propagated-inputs format
                               (format guix-package-propagated-input))
            (description simple (indent guix-package-info-description)))
  :titles guix-package-info-titles
  :required '(id package-id installed non-unique))

(defun guix-output-info-insert-version (version entry)
  "Insert output VERSION and obsolete text if needed at point."
  (guix-info-insert-value-format version
                                 'guix-package-info-version)
  (and (guix-entry-value entry 'obsolete)
       (guix-package-info-insert-obsolete-text)))

(defun guix-output-info-insert-output (output entry)
  "Insert OUTPUT and action buttons at point."
  (let* ((installed (guix-entry-value entry 'installed))
         (obsolete  (guix-entry-value entry 'obsolete))
         (action-type (if installed 'delete 'install)))
    (guix-info-insert-value-format
     output
     (if installed
         'guix-package-info-installed-outputs
       'guix-package-info-uninstalled-outputs))
    (guix-info-insert-indent)
    (guix-package-info-insert-action-button action-type entry output)
    (when obsolete
      (guix-info-insert-indent)
      (guix-package-info-insert-action-button 'upgrade entry output))))


;;; Displaying generations

(guix-ui-info-define-interface generation
  :format '((number format guix-generation-info-insert-number)
            (prev-number format (format))
            (current format guix-generation-info-insert-current)
            (path simple (indent guix-file))
            (time format (time)))
  :titles '((path . "File name")
            (prev-number . "Previous number")))

(defface guix-generation-info-number
  '((t :inherit font-lock-keyword-face))
  "Face used for a number of a generation."
  :group 'guix-generation-info-faces)

(defface guix-generation-info-current
  '((t :inherit guix-package-info-installed-outputs))
  "Face used if a generation is the current one."
  :group 'guix-generation-info-faces)

(defface guix-generation-info-not-current
  '((t nil))
  "Face used if a generation is not the current one."
  :group 'guix-generation-info-faces)

(defun guix-generation-info-insert-number (number &optional _)
  "Insert generation NUMBER and action buttons."
  (guix-info-insert-value-format number 'guix-generation-info-number)
  (guix-info-insert-indent)
  (guix-info-insert-action-button
   "Packages"
   (lambda (btn)
     (guix-get-show-entries guix-profile 'list guix-package-list-type
                            'generation (button-get btn 'number)))
   "Show installed packages for this generation"
   'number number)
  (guix-info-insert-indent)
  (guix-info-insert-action-button
   "Delete"
   (lambda (btn)
     (guix-delete-generations guix-profile (list (button-get btn 'number))
                              (current-buffer)))
   "Delete this generation"
   'number number))

(defun guix-generation-info-insert-current (val entry)
  "Insert boolean value VAL showing whether this generation is current."
  (if val
      (guix-info-insert-value-format "Yes" 'guix-generation-info-current)
    (guix-info-insert-value-format "No" 'guix-generation-info-not-current)
    (guix-info-insert-indent)
    (guix-info-insert-action-button
     "Switch"
     (lambda (btn)
       (guix-switch-to-generation guix-profile (button-get btn 'number)
                                  (current-buffer)))
     "Switch to this generation (make it the current one)"
     'number (guix-entry-value entry 'number))))


(defvar guix-info-font-lock-keywords
  (eval-when-compile
    `((,(rx "(" (group "guix-info-define-interface")
            symbol-end)
       . 1))))

(font-lock-add-keywords 'emacs-lisp-mode guix-info-font-lock-keywords)

(provide 'guix-info)

;;; guix-info.el ends here