aboutsummaryrefslogtreecommitdiff
path: root/emacs/guix-list.el
blob: 7e57f42cb220316ad562f9b6b6b17e4525788cde (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
;;; guix-list.el --- 'List' buffer interface for displaying data  -*- 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 'list' buffer interface for displaying an arbitrary
;; data.

;;; Code:

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

(guix-define-buffer-type list)

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

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

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


;;; Wrappers for 'list' variables

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

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

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

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

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

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

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

(defun guix-list-single-entry? (entry-type)
  "Return non-nil, if a single entry of ENTRY-TYPE should be listed."
  (guix-list-value entry-type 'list-single))

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

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


;;; Tabulated list internals

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

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

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

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

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

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

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

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

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

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

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


;;; Displaying entries

(defun guix-list-get-display-entries (entry-type &rest args)
  "Search for entries and show them in a 'list' buffer preferably."
  (let ((entries (guix-buffer-get-entries 'list entry-type args)))
    (if (or (null entries)      ; = 0
            (cdr entries)       ; > 1
            (guix-list-single-entry? entry-type)
            (null (guix-buffer-value 'info entry-type 'show-entries)))
        (guix-buffer-display-entries entries 'list entry-type args 'add)
      (if (equal (guix-buffer-value 'info entry-type 'get-entries)
                 (guix-buffer-value 'list entry-type 'get-entries))
          (guix-buffer-display-entries entries 'info entry-type args 'add)
        (guix-buffer-get-display-entries 'info entry-type args 'add)))))

(defun guix-list-insert-entries (entries entry-type)
  "Print ENTRY-TYPE ENTRIES in the current buffer."
  (setq tabulated-list-entries
        (guix-list-tabulated-entries entries entry-type))
  (tabulated-list-print))

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

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

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


;;; 'List' lines

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

(defun guix-list-current-entry ()
  "Return entry at point."
  (guix-entry-by-id (guix-list-current-id)
                    (guix-buffer-current-entries)))

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

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


;;; Marking and sorting

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

  (ID MARK-NAME . ARGS)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


;;; Major mode and interface definer

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

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

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

(defmacro guix-list-define-interface (entry-type &rest args)
  "Define 'list' 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-list-format' variable.

Optional keywords:

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

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

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

  - `:marks' - default value of the generated
    `guix-ENTRY-TYPE-list-marks' 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 "-list"))
         (group              (intern prefix))
         (describe-var       (intern (concat prefix "-describe-function")))
         (describe-count-var (intern (concat prefix
                                             "-describe-warning-count")))
         (format-var         (intern (concat prefix "-format")))
         (sort-key-var       (intern (concat prefix "-sort-key")))
         (list-single-var    (intern (concat prefix "-single")))
         (marks-var          (intern (concat prefix "-marks"))))
    (guix-keyword-args-let args
        ((show-entries-val   :show-entries-function)
         (describe-val       :describe-function)
         (describe-count-val :describe-count 10)
         (format-val         :format)
         (sort-key-val       :sort-key)
         (list-single-val    :list-single?)
         (marks-val          :marks))
      `(progn
         (defcustom ,format-var ,format-val
           ,(format "\
List of format values of the displayed columns.
Each element of the list has a form:

  (PARAM VALUE-FUN WIDTH SORT . PROPS)

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

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

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

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

  (PARAM . FLIP)

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

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

         (defcustom ,list-single-var ,list-single-val
           ,(format "\
If non-nil, list '%s' entry even if it is the only matching result.
If nil, show a single '%s' entry in the 'info' buffer."
                    entry-type-str entry-type-str)
           :type 'boolean
           :group ',group)

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

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

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

         ,(if show-entries-val
              `(guix-buffer-define-interface list ,entry-type
                 :show-entries-function ,show-entries-val
                 ,@%foreign-args)

            (let ((insert-fun    (intern (concat prefix "-insert-entries")))
                  (mode-init-fun (intern (concat prefix "-mode-initialize"))))
              `(progn
                 (defun ,insert-fun (entries)
                   ,(format "\
Print '%s' ENTRIES in the current 'list' buffer."
                            entry-type-str)
                   (guix-list-insert-entries entries ',entry-type))

                 (defun ,mode-init-fun ()
                   ,(format "\
Set up the current 'list' buffer for displaying '%s' entries."
                            entry-type-str)
                   (guix-list-mode-initialize ',entry-type))

                 (guix-buffer-define-interface list ,entry-type
                   :insert-entries-function ',insert-fun
                   :mode-init-function ',mode-init-fun
                   ,@%foreign-args))))))))

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

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

(provide 'guix-list)

;;; guix-list.el ends here