aboutsummaryrefslogtreecommitdiff
path: root/emacs/guix-base.el
blob: 4bd88992c4fffaa6b11b00340537ed163de14706 (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
;;; guix-base.el --- Common definitions   -*- 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 some base and common definitions for guix.el
;; package.

;;; Code:

(require 'cl-lib)
(require 'guix-profiles)
(require 'guix-backend)
(require 'guix-entry)
(require 'guix-guile)
(require 'guix-utils)
(require 'guix-ui)


;;; Parameters of the entries

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

(defun guix-package-entry->name-specification (entry &optional output)
  "Return name specification of the package ENTRY and OUTPUT."
  (guix-package-name-specification
   (guix-entry-value entry 'name)
   (guix-entry-value entry 'version)
   (or output (guix-entry-value entry 'output))))

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

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

(defun guix-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))))

(defun guix-package-location (id-or-name)
  "Return location of a package with ID-OR-NAME.
For the meaning of location, see `guix-find-location'."
  (guix-eval-read (guix-make-guile-expression
                   'package-location-string id-or-name)))


;;; Receivable lists of packages, lint checkers, etc.

(guix-memoized-defun guix-graph-type-names ()
  "Return a list of names of available graph node types."
  (guix-eval-read (guix-make-guile-expression 'graph-type-names)))

(guix-memoized-defun guix-refresh-updater-names ()
  "Return a list of names of available refresh updater types."
  (guix-eval-read (guix-make-guile-expression 'refresh-updater-names)))

(guix-memoized-defun guix-lint-checker-names ()
  "Return a list of names of available lint checkers."
  (guix-eval-read (guix-make-guile-expression 'lint-checker-names)))

(guix-memoized-defun guix-package-names ()
  "Return a list of names of available packages."
  (sort
   ;; Work around <https://github.com/jaor/geiser/issues/64>:
   ;; list of strings is parsed much slower than list of lists,
   ;; so we use 'package-names-lists' instead of 'package-names'.

   ;; (guix-eval-read (guix-make-guile-expression 'package-names))

   (mapcar #'car
           (guix-eval-read (guix-make-guile-expression
                            'package-names-lists)))
   #'string<))


;;; 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)


;;; Generations

(defcustom guix-generation-packages-buffer-name-function
  #'guix-generation-packages-buffer-name-default
  "Function used to define name of a buffer with generation packages.
This function is called with 2 arguments: PROFILE (string) and
GENERATION (number)."
  :type '(choice (function-item guix-generation-packages-buffer-name-default)
                 (function-item guix-generation-packages-buffer-name-long)
                 (function :tag "Other function"))
  :group 'guix)

(defcustom guix-generation-packages-update-buffer t
  "If non-nil, always update list of packages during comparing generations.
If nil, generation packages are received only once.  So when you
compare generation 1 and generation 2, the packages for both
generations will be received.  Then if you compare generation 1
and generation 3, only the packages for generation 3 will be
received.  Thus if you use comparing of different generations a
lot, you may set this variable to nil to improve the
performance."
  :type 'boolean
  :group 'guix)

(defvar guix-output-name-width 30
  "Width of an output name \"column\".
This variable is used in auxiliary buffers for comparing generations.")

(defun guix-generation-file (profile generation)
  "Return the file name of a PROFILE's GENERATION."
  (format "%s-%s-link" profile generation))

(defun guix-manifest-file (profile &optional generation)
  "Return the file name of a PROFILE's manifest.
If GENERATION number is specified, return manifest file name for
this generation."
  (expand-file-name "manifest"
                    (if generation
                        (guix-generation-file profile generation)
                      profile)))

(defun guix-generation-packages (profile generation)
  "Return a list of sorted packages installed in PROFILE's GENERATION.
Each element of the list is a list of the package specification and its path."
  (let ((names+paths (guix-eval-read
                      (guix-make-guile-expression
                       'generation-package-specifications+paths
                       profile generation))))
    (sort names+paths
          (lambda (a b)
            (string< (car a) (car b))))))

(defun guix-generation-packages-buffer-name-default (profile generation)
  "Return name of a buffer for displaying GENERATION's package outputs.
Use base name of PROFILE path."
  (let ((profile-name (file-name-base (directory-file-name profile))))
    (format "*Guix %s: generation %s*"
            profile-name generation)))

(defun guix-generation-packages-buffer-name-long (profile generation)
  "Return name of a buffer for displaying GENERATION's package outputs.
Use the full PROFILE path."
  (format "*Guix generation %s (%s)*"
          generation profile))

(defun guix-generation-packages-buffer-name (profile generation)
  "Return name of a buffer for displaying GENERATION's package outputs."
  (let ((fun (if (functionp guix-generation-packages-buffer-name-function)
                 guix-generation-packages-buffer-name-function
               #'guix-generation-packages-buffer-name-default)))
    (funcall fun profile generation)))

(defun guix-generation-insert-package (name path)
  "Insert package output NAME and PATH at point."
  (insert name)
  (indent-to guix-output-name-width 2)
  (insert path "\n"))

(defun guix-generation-insert-packages (buffer profile generation)
  "Insert package outputs installed in PROFILE's GENERATION in BUFFER."
  (with-current-buffer buffer
    (setq buffer-read-only nil
          indent-tabs-mode nil)
    (erase-buffer)
    (mapc (lambda (name+path)
            (guix-generation-insert-package
             (car name+path) (cadr name+path)))
          (guix-generation-packages profile generation))))

(defun guix-generation-packages-buffer (profile generation)
  "Return buffer with package outputs installed in PROFILE's GENERATION.
Create the buffer if needed."
  (let ((buf-name (guix-generation-packages-buffer-name
                   profile generation)))
    (or (and (null guix-generation-packages-update-buffer)
             (get-buffer buf-name))
        (let ((buf (get-buffer-create buf-name)))
          (guix-generation-insert-packages buf profile generation)
          buf))))

(defun guix-profile-generation-manifest-file (generation)
  "Return the file name of a GENERATION's manifest.
GENERATION is a generation number of the current profile."
  (guix-manifest-file (guix-ui-current-profile) generation))

(defun guix-profile-generation-packages-buffer (generation)
  "Insert GENERATION's package outputs in a buffer and return it.
GENERATION is a generation number of the current profile."
  (guix-generation-packages-buffer (guix-ui-current-profile)
                                   generation))


;;; 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-faces)

(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-ui-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-entry-by-id id entries)))
             (when entry
               (let ((location (guix-entry-value entry 'location)))
                 (concat (guix-package-entry->name-specification entry)
                         (when outputs
                           (concat ":"
                                   (guix-concat-strings 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 (&optional prompt)
  "Prompt a user for continuing the current operation.
Return non-nil, if the operation should be continued; nil otherwise.
Ask a user with PROMPT for continuing an operation."
  (let* ((option-keys (mapcar #'guix-operation-option-key
                              guix-operation-options))
         (keys (append '(?y ?n) option-keys))
         (prompt (concat (propertize (or prompt "Continue operation?")
                                     'face 'minibuffer-prompt)
                         " ("
                         (mapconcat
                          (lambda (key)
                            (propertize (string key)
                                        'face 'guix-operation-option-key))
                          keys
                          ", ")
                         ") ")))
    (let ((mode-line mode-line-format))
      (prog1 (guix-operation-prompt-1 prompt keys)
        (setq mode-line-format mode-line)
        ;; 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)))

(defun guix-package-source-path (package-id)
  "Return a store file path to a source of a package PACKAGE-ID."
  (message "Calculating the source derivation ...")
  (guix-eval-read
   (guix-make-guile-expression
    'package-source-path package-id)))

(defvar guix-after-source-download-hook nil
  "Hook run after successful performing a 'source-download' operation.")

(defun guix-package-source-build-derivation (package-id &optional prompt)
  "Build source derivation of a package PACKAGE-ID.
Ask a user with PROMPT for continuing an operation."
  (when (or (not guix-operation-confirm)
            (guix-operation-prompt (or prompt
                                       "Build the source derivation?")))
    (guix-eval-in-repl
     (guix-make-guile-expression
      'package-source-build-derivation
      package-id
      :use-substitutes? (or guix-use-substitutes 'f)
      :dry-run? (or guix-dry-run 'f))
     nil 'source-download)))

;;;###autoload
(defun guix-apply-manifest (profile file &optional operation-buffer)
  "Apply manifest from FILE to PROFILE.
This function has the same meaning as 'guix package --manifest' command.
See Info node `(guix) Invoking guix package' for details.

Interactively, use the current profile and prompt for manifest
FILE.  With a prefix argument, also prompt for PROFILE."
  (interactive
   (let* ((current-profile (guix-ui-current-profile))
          (profile (if current-prefix-arg
                       (guix-profile-prompt)
                     (or current-profile guix-current-profile)))
          (file (read-file-name "File with manifest: "))
          (buffer (and current-profile (current-buffer))))
     (list profile file buffer)))
  (when (or (not guix-operation-confirm)
            (y-or-n-p (format "Apply manifest from '%s' to profile '%s'? "
                              file profile)))
    (guix-eval-in-repl
     (guix-make-guile-expression
      'guix-command
      "package"
      (concat "--profile="  (expand-file-name profile))
      (concat "--manifest=" (expand-file-name file)))
     operation-buffer)))


;;; Executing guix commands

(defcustom guix-run-in-shell-function #'guix-run-in-shell
  "Function used to run guix command.
The function is called with a single argument - a command line string."
  :type '(choice (function-item guix-run-in-shell)
                 (function-item guix-run-in-eshell)
                 (function :tag "Other function"))
  :group 'guix)

(defcustom guix-shell-buffer-name "*shell*"
  "Default name of a shell buffer used for running guix commands."
  :type 'string
  :group 'guix)

(declare-function comint-send-input "comint" t)

(defun guix-run-in-shell (string)
  "Run command line STRING in `guix-shell-buffer-name' buffer."
  (shell guix-shell-buffer-name)
  (goto-char (point-max))
  (insert string)
  (comint-send-input))

(declare-function eshell-send-input "esh-mode" t)

(defun guix-run-in-eshell (string)
  "Run command line STRING in eshell buffer."
  (eshell)
  (goto-char (point-max))
  (insert string)
  (eshell-send-input))

(defun guix-run-command-in-shell (args)
  "Execute 'guix ARGS ...' command in a shell buffer."
  (funcall guix-run-in-shell-function
           (guix-command-string args)))

(defun guix-run-command-in-repl (args)
  "Execute 'guix ARGS ...' command in Guix REPL."
  (guix-eval-in-repl
   (apply #'guix-make-guile-expression
          'guix-command args)))

(defun guix-command-output (args)
  "Return string with 'guix ARGS ...' output."
  (cl-multiple-value-bind (output error)
      (guix-eval (apply #'guix-make-guile-expression
                        'guix-command-output args))
    ;; Remove trailing new space from the error string.
    (message (replace-regexp-in-string "\n\\'" "" (read error)))
    (read output)))

(defun guix-help-string (&optional commands)
  "Return string with 'guix COMMANDS ... --help' output."
  (guix-eval-read
   (apply #'guix-make-guile-expression
          'help-string commands)))


;;; Pull

(defcustom guix-update-after-pull t
  "If non-nil, update Guix buffers after performing \\[guix-pull]."
  :type 'boolean
  :group 'guix)

(defvar guix-after-pull-hook
  '(guix-restart-repl-after-pull guix-update-buffers-maybe-after-pull)
  "Hook run after successful performing `guix-pull' operation.")

(defun guix-restart-repl-after-pull ()
  "Restart Guix REPL after `guix-pull' operation."
  (guix-repl-exit)
  (guix-start-process-maybe
   "Restarting Guix REPL after pull operation ..."))

(defun guix-update-buffers-maybe-after-pull ()
  "Update buffers depending on `guix-update-after-pull'."
  (when guix-update-after-pull
    (mapc #'guix-ui-update-buffer
          ;; No need to update "generation" buffers.
          (guix-ui-buffers '(guix-package-list-mode
                             guix-package-info-mode
                             guix-output-list-mode
                             guix-output-info-mode)))
    (message "Guix buffers have been updated.")))

;;;###autoload
(defun guix-pull (&optional verbose)
  "Run Guix pull operation.
If VERBOSE is non-nil (with prefix argument), produce verbose output."
  (interactive "P")
  (let ((args (and verbose '("--verbose"))))
    (guix-eval-in-repl
     (apply #'guix-make-guile-expression
            'guix-command "pull" args)
     nil 'pull)))

(provide 'guix-base)

;;; guix-base.el ends here