summaryrefslogtreecommitdiff
path: root/guix/scripts/style.scm
blob: 4920a8d96991cd9e6de04e51e47d3280fa56f03c (about) (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
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2021-2023 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:
;;;
;;; This script updates package definitions so they use the "simplified" style
;;; for input lists, as in:
;;;
;;;  (package
;;;    ;; ...
;;;    (inputs (list foo bar baz)))
;;;
;;; Code:

(define-module (guix scripts style)
  #:autoload   (gnu packages) (specification->package fold-packages)
  #:use-module (guix scripts)
  #:use-module ((guix scripts build) #:select (%standard-build-options))
  #:use-module (guix ui)
  #:use-module (guix packages)
  #:use-module (guix utils)
  #:use-module (guix i18n)
  #:use-module (guix diagnostics)
  #:use-module (guix read-print)
  #:use-module (ice-9 control)
  #:use-module (ice-9 match)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-9)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-37)
  #:export (guix-style))


;;;
;;; Simplifying input expressions.
;;;

(define (label-matches? label name)
  "Return true if LABEL matches NAME, a package name."
  (or (string=? label name)
      (and (string-prefix? "python-" label)
           (string-prefix? "python2-" name)
           (string=? (string-drop label (string-length "python-"))
                     (string-drop name (string-length "python2-"))))))

(define* (simplify-inputs location package str inputs
                          #:key (label-matches? label-matches?))
  "Simplify the inputs field of PACKAGE (a string) at LOCATION; its current
value is INPUTS the corresponding source code is STR.  Return a string to
replace STR."
  (define (simplify-input-expression return)
    (match-lambda
      ((label ('unquote symbol)) symbol)
      ((label ('unquote symbol) output)
       (list 'quasiquote
             (list (list 'unquote symbol) output)))
      (_
       ;; Expression doesn't look like a simple input.
       (warning location (G_ "~a: complex expression, \
bailing out~%")
                package)
       (return str))))

  (define (simplify-input exp input return)
    (define package* package)

    (match input
      ((or ((? string? label) (? package? package))
           ((? string? label) (? package? package)
            (? string?)))
       ;; If LABEL doesn't match PACKAGE's name, then simplifying would incur
       ;; a rebuild, and perhaps it would break build-side code relying on
       ;; this specific label.
       (if (label-matches? label (package-name package))
           ((simplify-input-expression return) exp)
           (begin
             (warning location (G_ "~a: input label \
'~a' does not match package name, bailing out~%")
                      package* label)
             (return str))))
      (_
       (warning location (G_ "~a: non-trivial input, \
bailing out~%")
                package*)
       (return str))))

  (define (simplify-expressions exp inputs return)
    ;; Simplify the expressions in EXP, which correspond to INPUTS, and return
    ;; a list of expressions.  Call RETURN with a string when bailing out.
    (let loop ((result '())
               (exp exp)
               (inputs inputs))
      (match exp
        (((? blank? head) . rest)
         (loop (cons head result) rest inputs))
        ((head . rest)
         (match inputs
           ((input . inputs)
            ;; HEAD (an sexp) and INPUT (an input tuple) are correlated.
            (loop (cons (simplify-input head input return) result)
                  rest inputs))
           (()
            ;; If EXP and INPUTS have a different length, that
            ;; means EXP is a non-trivial input list, for example
            ;; with input-splicing, conditionals, etc.
            (warning location (G_ "~a: input expression is too short~%")
                     package)
            (return str))))
        (()
         ;; It's possible for EXP to contain fewer elements than INPUTS, for
         ;; example in the case of input splicing.  No bailout here.  (XXX)
         (reverse result)))))

  (define inputs-exp
    (call-with-input-string str read-with-comments))

  (match inputs-exp
    (('list _ ...)                                ;already done
     str)
    (('modify-inputs _ ...)                       ;already done
     str)
    (('quasiquote                                 ;prepending inputs
      (exp ...
           ('unquote-splicing
            ((and symbol (or 'package-inputs 'package-native-inputs
                             'package-propagated-inputs))
             arg))))
     (let/ec return
       (object->string*
        (let ((things (simplify-expressions exp inputs return)))
          `(modify-inputs (,symbol ,arg)
                          (prepend ,@things)))
        (location-column location))))
    (('quasiquote                                 ;replacing an input
      ((and exp ((? string? to-delete) ('unquote replacement)))
       ('unquote-splicing
        ('alist-delete (? string? to-delete)
                       ((and symbol
                             (or 'package-inputs 'package-native-inputs
                                 'package-propagated-inputs))
                        arg)))))
     (let/ec return
       (object->string*
        (let ((things (simplify-expressions (list exp)
                                            (list (car inputs))
                                            return)))
          `(modify-inputs (,symbol ,arg)
                          (replace ,to-delete ,replacement)))
        (location-column location))))

    (('quasiquote                                 ;removing an input
      (exp ...
           ('unquote-splicing
            ('alist-delete (? string? to-delete)
                           ((and symbol
                                 (or 'package-inputs 'package-native-inputs
                                     'package-propagated-inputs))
                            arg)))))
     (let/ec return
       (object->string*
        (let ((things (simplify-expressions exp inputs return)))
          `(modify-inputs (,symbol ,arg)
                          (delete ,to-delete)
                          (prepend ,@things)))
        (location-column location))))
    (('fold 'alist-delete                         ;removing several inputs
            ((and symbol
                  (or 'package-inputs 'package-native-inputs
                      'package-propagated-inputs))
             arg)
            ('quote ((? string? to-delete) ...)))
     (object->string*
      `(modify-inputs (,symbol ,arg)
                      (delete ,@to-delete))
      (location-column location)))
    (('quasiquote                    ;removing several inputs and adding others
      (exp ...
           ('unquote-splicing
            ('fold 'alist-delete
                   ((and symbol
                         (or 'package-inputs 'package-native-inputs
                             'package-propagated-inputs))
                    arg)
                   ('quote ((? string? to-delete) ...))))))
     (let/ec return
       (object->string*
        (let ((things (simplify-expressions exp inputs return)))
          `(modify-inputs (,symbol ,arg)
                          (delete ,@to-delete)
                          (prepend ,@things)))
        (location-column location))))
    (('quasiquote (exp ...))
     (let/ec return
       (object->string*
        `(list ,@(simplify-expressions exp inputs return))
        (location-column location))))
    (_
     (warning location (G_ "~a: unsupported input style, \
bailing out~%")
              package)
     str)))

(define (edit-expression/dry-run properties rewrite-string)
  "Like 'edit-expression' but display what would be edited without actually
doing it."
  (edit-expression properties
                   (lambda (str)
                     (unless (string=? (rewrite-string str) str)
                       (info (source-properties->location properties)
                             (G_ "would be edited~%")))
                     str)))

(define (trivial-package-arguments? package)
  "Return true if PACKAGE has zero arguments or only \"trivial\" arguments
guaranteed not to refer to input labels."
  (let loop ((arguments (package-arguments package)))
    (match arguments
      (()
       #t)
      (((? keyword?) value rest ...)
       (and (or (boolean? value) (number? value) (string? value))
            (loop rest))))))

(define* (simplify-package-inputs package
                                  #:key (policy 'silent)
                                  (edit-expression edit-expression))
  "Edit the source code of PACKAGE to simplify its inputs field if needed.
POLICY is a symbol that defines whether to simplify inputs; it can one of
'silent (change only if the resulting derivation is the same), 'safe (change
only if semantics are known to be unaffected), and 'always (fearlessly
simplify inputs!).  Call EDIT-EXPRESSION to actually edit the source of
PACKAGE."
  (for-each (lambda (field-name field)
              (match (field package)
                (()
                 #f)
                (inputs
                 (match (package-field-location package field-name)
                   (#f
                    ;; If the location of FIELD-NAME is not found, it may be
                    ;; that PACKAGE inherits from another package.
                    #f)
                   (location
                    (edit-expression
                     (location->source-properties (absolute-location location))
                     (lambda (str)
                       (define matches?
                         (match policy
                           ('silent
                            ;; Simplify inputs only when the label matches
                            ;; perfectly, such that the resulting derivation
                            ;; is unchanged.
                            label-matches?)
                           ('safe
                            ;; If PACKAGE has no arguments, labels are known
                            ;; to have no effect: this is a "safe" change, but
                            ;; it may change the derivation.
                            (if (trivial-package-arguments? package)
                                (const #t)
                                label-matches?))
                           ('always
                            ;; Assume it's gonna be alright.
                            (const #t))))

                       (simplify-inputs location
                                        (package-name package)
                                        str inputs
                                        #:label-matches? matches?))))))))
            '(inputs native-inputs propagated-inputs)
            (list package-inputs package-native-inputs
                  package-propagated-inputs)))


;;;
;;; Gexpifying package arguments.
;;;

(define (unquote->ungexp value)
  "Replace 'unquote' and 'unquote-splicing' in VALUE with their gexp
counterpart."
  ;; Replace 'unquote only on the first quasiquotation level.
  (let loop ((value value)
             (quotation 1))
    (match value
      (('unquote x)
       (if (= quotation 1)
           `(ungexp ,x)
           value))
      (('unquote-splicing x)
       (if (= quotation 1)
           `(ungexp-splicing x)
           value))
      (('quasiquote x)
       (list 'quasiquote (loop x (+ quotation 1))))
      (('quote x)
       (list 'quote (loop x (+ quotation 1))))
      ((lst ...)
       (map (cut loop <> quotation) lst))
      (x x))))

(define (gexpify-argument-value value quotation)
  "Turn VALUE, an sexp, into its gexp equivalent.  QUOTATION is a symbol that
indicates in what quotation context VALUE is to be interpreted: 'quasiquote,
'quote, or 'none."
  (match quotation
    ('none
     (match value
       (('quasiquote value)
        (gexpify-argument-value value 'quasiquote))
       (('quote value)
        (gexpify-argument-value value 'quote))
       (value value)))
    ('quote
     `(gexp ,value))
    ('quasiquote
     `(gexp ,(unquote->ungexp value)))))

(define (quote-argument-value value quotation)
  "Quote VALUE, an sexp.  QUOTATION is a symbol that indicates in what
quotation context VALUE is to be interpreted: 'quasiquote, 'quote, or 'none."
  (define (self-quoting? x)
    (or (boolean? x) (number? x) (string? x) (char? x)
        (keyword? x)))

  (match quotation
    ('none
     (match value
       (('quasiquote value)
        (quote-argument-value value 'quasiquote))
       (('quote value)
        (quote-argument-value value 'quote))
       (value value)))
    ('quote
     (if (self-quoting? value)
         value
         (list 'quote value)))
    ('quasiquote
     (match value
       (('unquote x) x)
       ((? self-quoting? x) x)
       (_ (list 'quasiquote value))))))

(define %gexp-keywords
  ;; Package argument keywords that must be followed by a gexp.
  '(#:phases #:configure-flags #:make-flags #:strip-flags))

(define (gexpify-argument-tail sexp)
  "Gexpify SEXP, an unquoted argument tail."
  (match sexp
    (('substitute-keyword-arguments lst clauses ...)
     `(substitute-keyword-arguments ,lst
        ,@(map (match-lambda
                 ((((? keyword? keyword) identifier) body)
                  `((,keyword ,identifier)
                    ,(if (memq keyword %gexp-keywords)
                         (gexpify-argument-value body 'none)
                         (quote-argument-value body 'none))))
                 ((((? keyword? keyword) identifier default) body)
                  `((,keyword ,identifier
                              ,(if (memq keyword %gexp-keywords)
                                   (gexpify-argument-value default 'none)
                                   (quote-argument-value default 'none)))
                    ,(if (memq keyword %gexp-keywords)
                         (gexpify-argument-value body 'none)
                         (quote-argument-value body 'none))))
                 (clause clause))
               clauses)))
    (_ sexp)))

(define* (gexpify-package-arguments package
                                    #:key
                                    (policy 'none)
                                    (edit-expression edit-expression))
  "Rewrite the 'arguments' field of PACKAGE to use gexps where applicable."
  (define (gexpify location str)
    (match (call-with-input-string str read-with-comments)
      ((rest ...)
       (let ((blanks (take-while blank? rest))
             (value  (drop-while blank? rest)))
         (define-values (quotation arguments tail)
           (match value
             (('quote (arguments ...)) (values 'quote arguments '()))
             (('quasiquote (arguments ... ('unquote-splicing tail)))
              (values 'quasiquote arguments tail))
             (('quasiquote (arguments ...)) (values 'quasiquote arguments '()))
             (('list arguments ...) (values 'none arguments '()))
             (arguments (values 'none '()  arguments))))

         (define (append-tail sexp)
           (if (null? tail)
               sexp
               (let ((tail (gexpify-argument-tail tail)))
                 (if (null? arguments)
                     tail
                     `(append ,sexp ,tail)))))

         (let/ec return
           (object->string*
            (append-tail
             `(list ,@(let loop ((arguments arguments)
                                 (result '()))
                        (match arguments
                          (() (reverse result))
                          (((? keyword? keyword) value rest ...)
                           (when (eq? quotation 'none)
                             (match value
                               (('gexp _)         ;already gexpified
                                (return str))
                               (_ #f)))

                           (loop rest
                                 (cons* (if (memq keyword %gexp-keywords)
                                            (gexpify-argument-value value
                                                                    quotation)
                                            (quote-argument-value value quotation))
                                        keyword result)))
                          (((? blank? blank) rest ...)
                           (loop rest (cons blank result)))
                          (_
                           ;; Something like: ,@(package-arguments xyz).
                           (warning location
                                    (G_ "unsupported argument style; \
bailing out~%"))
                           (return str))))))
            (location-column location)))))
      (_
       (warning location
                (G_ "unsupported argument field; bailing out~%"))
       str)))

  (unless (null? (package-arguments package))
    (match (package-field-location package 'arguments)
      (#f
       #f)
      (location
       (edit-expression
        (location->source-properties (absolute-location location))
        (lambda (str)
          (gexpify location str)))))))


;;;
;;; Formatting package definitions.
;;;

(define* (format-package-definition package
                                    #:key policy
                                    (edit-expression edit-expression))
  "Reformat the definition of PACKAGE."
  (unless (package-definition-location package)
    (leave (package-location package)
           (G_ "no definition location for package ~a~%")
           (package-full-name package)))

  (edit-expression
   (location->source-properties
    (absolute-location (package-definition-location package)))
   (lambda (str)
     (let ((exp (call-with-input-string str
                  read-with-comments)))
       (object->string* exp
                        (location-column
                         (package-definition-location package))
                        #:format-comment canonicalize-comment
                        #:format-vertical-space canonicalize-vertical-space)))))

(define (package-location<? p1 p2)
  "Return true if P1's location is \"before\" P2's."
  (let ((loc1 (package-location p1))
        (loc2 (package-location p2)))
    (and loc1 loc2
         (if (string=? (location-file loc1) (location-file loc2))
             (< (location-line loc1) (location-line loc2))
             (string<? (location-file loc1) (location-file loc2))))))


;;;
;;; Whole-file formatting.
;;;

(define* (format-whole-file file #:rest rest)
  "Reformat all of FILE."
  (with-fluids ((%default-port-encoding "UTF-8"))
    (let ((lst (call-with-input-file file read-with-comments/sequence
                                     #:guess-encoding #t)))
      (with-atomic-file-output file
        (lambda (port)
          (apply pretty-print-with-comments/splice port lst
                 #:format-comment canonicalize-comment
                 #:format-vertical-space canonicalize-vertical-space
                 rest))))))


;;;
;;; Options.
;;;

(define %options
  ;; Specification of the command-line options.
  (list (find (lambda (option)
                (member "load-path" (option-names option)))
              %standard-build-options)

        (option '(#\n "dry-run") #f #f
                (lambda (opt name arg result)
                  (alist-cons 'dry-run? #t result)))
        (option '(#\e "expression") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'expression arg result)))
        (option '(#\f "whole-file") #f #f
                (lambda (opt name arg result)
                  (alist-cons 'whole-file? #t result)))
        (option '(#\S "styling") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'styling-procedure
                              (match arg
                                ("inputs" simplify-package-inputs)
                                ("arguments" gexpify-package-arguments)
                                ("format" format-package-definition)
                                (_ (leave (G_ "~a: unknown styling~%")
                                          arg)))
                              result)))
        (option '("input-simplification") #t #f
                (lambda (opt name arg result)
                  (let ((symbol (string->symbol arg)))
                    (unless (memq symbol '(silent safe always))
                      (leave (G_ "~a: invalid input simplification policy~%")
                             arg))
                    (alist-cons 'input-simplification-policy symbol
                                result))))

        (option '(#\h "help") #f #f
                (lambda args
                  (show-help)
                  (exit 0)))
        (option '(#\l "list-stylings") #f #f
                (lambda args
                  (show-stylings)
                  (exit 0)))
        (option '(#\V "version") #f #f
                (lambda args
                  (show-version-and-exit "guix style")))))

(define (show-stylings)
  (display (G_ "Available styling rules:\n"))
  (display (G_ "- format: Format the given package definition(s)\n"))
  (display (G_ "- inputs: Rewrite package inputs to the “new style”\n"))
  (display (G_ "- arguments: Rewrite package arguments to G-expressions\n")))

(define (show-help)
  (display (G_ "Usage: guix style [OPTION]... [PACKAGE]...
Update package definitions to the latest style.\n"))
  (display (G_ "
  -S, --styling=RULE     apply RULE, a styling rule"))
  (display (G_ "
  -l, --list-stylings   display the list of available style rules"))
  (newline)
  (display (G_ "
  -n, --dry-run          display files that would be edited but do nothing"))
  (display (G_ "
  -L, --load-path=DIR    prepend DIR to the package module search path"))
  (display (G_ "
  -e, --expression=EXPR  consider the package EXPR evaluates to"))
  (display (G_ "
      --input-simplification=POLICY
                         follow POLICY for package input simplification, one
                         of 'silent', 'safe', or 'always'"))
  (newline)
  (display (G_ "
  -f, --whole-file       format the entire contents of the given file(s)"))
  (newline)
  (display (G_ "
  -h, --help             display this help and exit"))
  (display (G_ "
  -V, --version          display version information and exit"))
  (newline)
  (show-bug-report-information))

(define %default-options
  ;; Alist of default option values.
  `((input-simplification-policy . silent)
    (styling-procedure . ,format-package-definition)))


;;;
;;; Entry point.
;;;

(define-command (guix-style . args)
  (category packaging)
  (synopsis "update the style of package definitions")

  (define (parse-options)
    ;; Return the alist of option values.
    (parse-command-line args %options (list %default-options)
                        #:build-options? #f))

  (let* ((opts     (parse-options))
         (edit     (if (assoc-ref opts 'dry-run?)
                       edit-expression/dry-run
                       edit-expression))
         (style    (assoc-ref opts 'styling-procedure))
         (policy   (assoc-ref opts 'input-simplification-policy)))
    (with-error-handling
      (if (assoc-ref opts 'whole-file?)
          (let ((files (filter-map (match-lambda
                                     (('argument . file) file)
                                     (_ #f))
                                   opts)))
            (unless (eq? format-package-definition style)
              (warning (G_ "'--styling' option has no effect in whole-file mode~%")))
            (for-each format-whole-file files))
          (let ((packages (filter-map (match-lambda
                                        (('argument . spec)
                                         (specification->package spec))
                                        (('expression . str)
                                         (read/eval str))
                                        (_ #f))
                                      opts)))
            (for-each (lambda (package)
                        (style package #:policy policy
                               #:edit-expression edit))
                      ;; Sort package by source code location so that we start
                      ;; editing files from the bottom and going upward.  That
                      ;; way, the 'location' field of <package> records is not
                      ;; invalidated as we modify files.
                      (sort (if (null? packages)
                                (fold-packages cons '() #:select? (const #t))
                                packages)
                            (negate package-location<?))))))))