aboutsummaryrefslogtreecommitdiff
path: root/doc/build.scm
blob: e171b539e6e24a82740c3febfd5cc17019769037 (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
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
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 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/>.


;; This file contains machinery to build HTML and PDF copies of the manual
;; that can be readily published on the web site.  To do that, run:
;;
;;  guix build -f build.scm
;;
;; The result is a directory hierarchy that can be used as the manual/
;; sub-directory of the web site.

(use-modules (guix)
             (guix gexp)
             (guix git)
             (guix git-download)
             (guix utils)
             (git)
             (gnu packages base)
             (gnu packages gawk)
             (gnu packages gettext)
             (gnu packages guile)
             (gnu packages guile-xyz)
             (gnu packages iso-codes)
             (gnu packages texinfo)
             (gnu packages tex)
             (srfi srfi-19)
             (srfi srfi-71))

(define file-append*
  (@@ (guix self) file-append*))

(define translated-texi-manuals
  (@@ (guix self) translate-texi-manuals))

(define info-manual
  (@@ (guix self) info-manual))

(define %manual
  ;; The manual to build--i.e., the base name of a .texi file, such as "guix"
  ;; or "guix-cookbook".
  (or (getenv "GUIX_MANUAL")
      "guix"))

(define %languages
  '("de" "en" "es" "fr" "ru" "zh_CN"))

(define (texinfo-manual-images source)
  "Return a directory containing all the images used by the user manual, taken
from SOURCE, the root of the source tree."
  (define graphviz
    (module-ref (resolve-interface '(gnu packages graphviz))
                'graphviz))

  (define images
    (file-append* source "doc/images"))

  (define build
    (with-imported-modules '((guix build utils))
      #~(begin
          (use-modules (guix build utils)
                       (srfi srfi-26))

          (define (dot->image dot-file format)
            (invoke #+(file-append graphviz "/bin/dot")
                    "-T" format "-Gratio=.9" "-Gnodesep=.005"
                    "-Granksep=.00005" "-Nfontsize=9"
                    "-Nheight=.1" "-Nwidth=.1"
                    "-o" (string-append #$output "/"
                                        (basename dot-file ".dot")
                                        "." format)
                    dot-file))

          ;; Build graphs.
          (mkdir-p #$output)
          (for-each (lambda (dot-file)
                      (for-each (cut dot->image dot-file <>)
                                '("png" "pdf")))
                    (find-files #$images "\\.dot$"))

          ;; Copy other PNGs.
          (for-each (lambda (png-file)
                      (install-file png-file #$output))
                    (find-files #$images "\\.png$")))))

  (computed-file "texinfo-manual-images" build))

(define* (texinfo-manual-source source #:key
                                (version "0.0")
                                (languages %languages)
                                (date 1))
  "Gather all the source files of the Texinfo manuals from SOURCE--.texi file
as well as images, OS examples, and translations."
  (define documentation
    (file-append* source "doc"))

  (define examples
    (file-append* source "gnu/system/examples"))

  (define build
    (with-imported-modules '((guix build utils))
      #~(begin
          (use-modules (guix build utils)
                       (srfi srfi-19))

          (define (make-version-texi language)
            ;; Create the 'version.texi' file for LANGUAGE.
            (let ((file (if (string=? language "en")
                            "version.texi"
                            (string-append "version-" language ".texi"))))
              (call-with-output-file (string-append #$output "/" file)
                (lambda (port)
                  (let* ((version #$version)
                         (time    (make-time time-utc 0 #$date))
                         (date    (time-utc->date time)))
                    (format port "
@set UPDATED ~a
@set UPDATED-MONTH ~a
@set EDITION ~a
@set VERSION ~a\n"
                            (date->string date "~e ~B ~Y")
                            (date->string date "~B ~Y")
                            version version))))))

          (install-file #$(file-append* documentation "/htmlxref.cnf")
                        #$output)

          (for-each (lambda (texi)
                      (install-file texi #$output))
                    (append (find-files #$documentation "\\.(texi|scm)$")
                            (find-files #$(translated-texi-manuals source)
                                        "\\.texi$")))

          ;; Create 'version.texi'.
          (for-each make-version-texi '#$languages)

          ;; Copy configuration templates that the manual includes.
          (for-each (lambda (template)
                      (copy-file template
                                 (string-append
                                  #$output "/os-config-"
                                  (basename template ".tmpl")
                                  ".texi")))
                    (find-files #$examples "\\.tmpl$"))

          (symlink #$(texinfo-manual-images source)
                   (string-append #$output "/images")))))

  (computed-file "texinfo-manual-source" build))

(define %web-site-url
  ;; URL of the web site home page.
  (or (getenv "GUIX_WEB_SITE_URL")
      "/software/guix/"))

(define %makeinfo-html-options
  ;; Options passed to 'makeinfo --html'.
  '("--css-ref=https://www.gnu.org/software/gnulib/manual.css"
    "-c" "EXTRA_HEAD=<meta name=\"viewport\" \
content=\"width=device-width, initial-scale=1\" />"))

(define guile-lib/htmlprag-fixed
  ;; Guile-Lib with a hotfix for (htmlprag).
  (package
    (inherit guile-lib)
    (source (origin
              (inherit (package-source guile-lib))
              (modules '(( guix build utils)))
              (snippet
               '(begin
                  ;; When parsing
                  ;; "<body><blockquote><p>foo</p>\n</blockquote></body>",
                  ;; 'html->shtml' would mistakenly close 'blockquote' right
                  ;; before <p>.  This patch removes 'p' from the
                  ;; 'parent-constraints' alist to fix that.
                  (substitute* "src/htmlprag.scm"
                    (("^[[:blank:]]*\\(p[[:blank:]]+\\. \\(body td th\\)\\).*")
                     ""))
                  #t))))
    (arguments
     (substitute-keyword-arguments (package-arguments guile-lib)
       ((#:phases phases '%standard-phases)
        `(modify-phases ,phases
          (add-before 'check 'skip-known-failure
            (lambda _
              ;; XXX: The above change causes one test failure among
              ;; the htmlprag tests.
              (setenv "XFAIL_TESTS" "htmlprag.scm")
              #t))))))))

(define* (syntax-highlighted-html input
                                  #:key
                                  (name "highlighted-syntax")
                                  (syntax-css-url
                                   "/static/base/css/code.css"))
  "Return a derivation called NAME that processes all the HTML files in INPUT
to (1) add them a link to SYNTAX-CSS-URL, and (2) highlight the syntax of all
its <pre class=\"lisp\"> blocks (as produced by 'makeinfo --html')."
  (define build
    (with-extensions (list guile-lib/htmlprag-fixed guile-syntax-highlight)
      (with-imported-modules '((guix build utils))
        #~(begin
            (use-modules (htmlprag)
                         (syntax-highlight)
                         (syntax-highlight scheme)
                         (syntax-highlight lexers)
                         (guix build utils)
                         (ice-9 match)
                         (ice-9 threads))

            (define (pair-open/close lst)
              ;; Pair 'open' and 'close' tags produced by 'highlights' and
              ;; produce nested 'paren' tags instead.
              (let loop ((lst lst)
                         (level 0)
                         (result '()))
                (match lst
                  ((('open open) rest ...)
                   (call-with-values
                       (lambda ()
                         (loop rest (+ 1 level) '()))
                     (lambda (inner close rest)
                       (loop rest level
                             (cons `(paren ,level ,open ,inner ,close)
                                   result)))))
                  ((('close str) rest ...)
                   (if (> level 0)
                       (values (reverse result) str rest)
                       (begin
                         (format (current-error-port)
                                 "warning: extra closing paren; context:~% ~y~%"
                                 (reverse result))
                         (loop rest 0 (cons `(close ,str) result)))))
                  ((item rest ...)
                   (loop rest level (cons item result)))
                  (()
                   (when (> level 0)
                     (format (current-error-port)
                             "warning: missing ~a closing parens; context:~% ~y%"
                             level (reverse result)))
                   (values (reverse result) "" '())))))

            (define (highlights->sxml* highlights)
              ;; Like 'highlights->sxml', but handle nested 'paren tags.  This
              ;; allows for paren matching highlights via appropriate CSS
              ;; "hover" properties.
              (define (tag->class tag)
                (string-append "syntax-" (symbol->string tag)))

              (map (match-lambda
                     ((? string? str) str)
                     (('paren level open (body ...) close)
                      `(span (@ (class ,(string-append "syntax-paren"
                                                       (number->string level))))
                             ,open
                             (span (@ (class "syntax-symbol"))
                                   ,@(highlights->sxml* body))
                             ,close))
                     ((tag text)
                      `(span (@ (class ,(tag->class tag))) ,text)))
                   highlights))

            (define entity->string
              (match-lambda
                ("rArr"   "⇒")
                ("rarr"   "→")
                ("hellip" "…")
                ("rsquo"  "’")
                (e (pk 'unknown-entity e) (primitive-exit 2))))

            (define (concatenate-snippets pieces)
              ;; Concatenate PIECES, which contains strings and entities,
              ;; replacing entities with their corresponding string.
              (let loop ((pieces pieces)
                         (strings '()))
                (match pieces
                  (()
                   (string-concatenate-reverse strings))
                  (((? string? str) . rest)
                   (loop rest (cons str strings)))
                  ((('*ENTITY* "additional" entity) . rest)
                   (loop rest (cons (entity->string entity) strings)))
                  ((('span _ lst ...) . rest)     ;for <span class="roman">
                   (loop (append lst rest) strings))
                  (something
                   (pk 'unsupported-code-snippet something)
                   (primitive-exit 1)))))

            (define (syntax-highlight sxml)
              ;; Recurse over SXML and syntax-highlight code snippets.
              (match sxml
                (('*TOP* decl body ...)
                 `(*TOP* ,decl ,@(map syntax-highlight body)))
                (('head things ...)
                 `(head ,@things
                        (link (@ (rel "stylesheet")
                                 (type "text/css")
                                 (href #$syntax-css-url)))))
                (('pre ('@ ('class "lisp")) code-snippet ...)
                 `(pre (@ (class "lisp"))
                       ,@(highlights->sxml*
                          (pair-open/close
                           (highlight lex-scheme
                                      (concatenate-snippets code-snippet))))))
                ((tag ('@ attributes ...) body ...)
                 `(,tag (@ ,@attributes) ,@(map syntax-highlight body)))
                ((tag body ...)
                 `(,tag ,@(map syntax-highlight body)))
                ((? string? str)
                 str)))

            (define (process-html file)
              ;; Parse FILE and perform syntax highlighting for its Scheme
              ;; snippets.  Install the result to #$output.
              (format (current-error-port) "processing ~a...~%" file)
              (let* ((shtml        (call-with-input-file file html->shtml))
                     (highlighted  (syntax-highlight shtml))
                     (base         (string-drop file (string-length #$input)))
                     (target       (string-append #$output base)))
                (mkdir-p (dirname target))
                (call-with-output-file target
                  (lambda (port)
                    (write-shtml-as-html highlighted port)))))

            (define (copy-as-is file)
              ;; Copy FILE as is to #$output.
              (let* ((base   (string-drop file (string-length #$input)))
                     (target (string-append #$output base)))
                (mkdir-p (dirname target))
                (catch 'system-error
                  (lambda ()
                    (if (eq? 'symlink (stat:type (lstat file)))
                        (symlink (readlink file) target)
                        (link file target)))
                  (lambda args
                    (let ((errno (system-error-errno args)))
                      (pk 'error-link file target (strerror errno))
                      (primitive-exit 3))))))

            ;; Install a UTF-8 locale so we can process UTF-8 files.
            (setenv "GUIX_LOCPATH"
                    #+(file-append glibc-utf8-locales "/lib/locale"))
            (setlocale LC_ALL "en_US.utf8")

            (n-par-for-each (parallel-job-count)
                            (lambda (file)
                              (if (string-suffix? ".html" file)
                                  (process-html file)
                                  (copy-as-is file)))
                            (find-files #$input))))))

  (computed-file name build))

(define* (html-manual source #:key (languages %languages)
                      (version "0.0")
                      (manual %manual)
                      (date 1)
                      (options %makeinfo-html-options))
  "Return the HTML manuals built from SOURCE for all LANGUAGES, with the given
makeinfo OPTIONS."
  (define manual-source
    (texinfo-manual-source source
                           #:version version
                           #:languages languages
                           #:date date))

  (define images
    (texinfo-manual-images source))

  (define build
    (with-imported-modules '((guix build utils))
      #~(begin
          (use-modules (guix build utils)
                       (ice-9 match))

          (define (normalize language)
            ;; Normalize LANGUAGE.  For instance, "zh_CN" becomes "zh-cn".
            (string-map (match-lambda
                          (#\_ #\-)
                          (chr chr))
                        (string-downcase language)))

          (define (language->texi-file-name language)
            (if (string=? language "en")
                (string-append #$manual-source "/"
                               #$manual ".texi")
                (string-append #$manual-source "/"
                               #$manual "." language ".texi")))

          ;; Install a UTF-8 locale so that 'makeinfo' is at ease.
          (setenv "GUIX_LOCPATH"
                  #+(file-append glibc-utf8-locales "/lib/locale"))
          (setenv "LC_ALL" "en_US.utf8")

          (setvbuf (current-output-port) 'line)
          (setvbuf (current-error-port) 'line)

          (for-each (lambda (language)
                      (let* ((texi (language->texi-file-name language))
                             (opts `("--html"
                                     "-c" ,(string-append "TOP_NODE_UP_URL=/manual/"
                                                         language)
                                     #$@options
                                     ,texi)))
                        (format #t "building HTML manual for language '~a'...~%"
                                language)
                        (mkdir-p (string-append #$output "/"
                                                (normalize language)))
                        (setenv "LANGUAGE" language)
                        (apply invoke #$(file-append texinfo "/bin/makeinfo")
                               "-o" (string-append #$output "/"
                                                   (normalize language)
                                                   "/html_node")
                               opts)
                        (apply invoke #$(file-append texinfo "/bin/makeinfo")
                               "--no-split"
                               "-o"
                               (string-append #$output "/"
                                              (normalize language)
                                              "/" #$manual
                                              (if (string=? language "en")
                                                  ""
                                                  (string-append "." language))
                                              ".html")
                               opts)

                        ;; Make sure images are available.
                        (symlink #$images
                                 (string-append #$output "/" (normalize language)
                                                "/images"))
                        (symlink #$images
                                 (string-append #$output "/" (normalize language)
                                                "/html_node/images"))))
                    (filter (compose file-exists? language->texi-file-name)
                            '#$languages)))))

  (let* ((name   (string-append manual "-html-manual"))
         (manual (computed-file name build)))
    (syntax-highlighted-html manual
                             #:name (string-append name "-highlighted"))))

(define* (pdf-manual source #:key (languages %languages)
                     (version "0.0")
                     (manual %manual)
                     (date 1)
                     (options '()))
  "Return the HTML manuals built from SOURCE for all LANGUAGES, with the given
makeinfo OPTIONS."
  (define manual-source
    (texinfo-manual-source source
                           #:version version
                           #:languages languages
                           #:date date))

  ;; FIXME: This union works, except for the table of contents of non-English
  ;; manuals, which contains escape sequences like "^^ca^^fe" instead of
  ;; accented letters.
  ;;
  ;; (define texlive
  ;;   (texlive-union (list texlive-tex-texinfo
  ;;                        texlive-generic-epsf
  ;;                        texlive-fonts-ec)))

  (define build
    (with-imported-modules '((guix build utils))
      #~(begin
          (use-modules (guix build utils)
                       (srfi srfi-34)
                       (ice-9 match))

          (define (normalize language)            ;XXX: deduplicate
            ;; Normalize LANGUAGE.  For instance, "zh_CN" becomes "zh-cn".
            (string-map (match-lambda
                          (#\_ #\-)
                          (chr chr))
                        (string-downcase language)))

          ;; Install a UTF-8 locale so that 'makeinfo' is at ease.
          (setenv "GUIX_LOCPATH"
                  #+(file-append glibc-utf8-locales "/lib/locale"))
          (setenv "LC_ALL" "en_US.utf8")
          (setenv "PATH"
                  (string-append #+(file-append texlive "/bin") ":"
                                 #+(file-append texinfo "/bin") ":"

                                 ;; Below are command-line tools needed by
                                 ;; 'texi2dvi' and friends.
                                 #+(file-append sed "/bin") ":"
                                 #+(file-append grep "/bin") ":"
                                 #+(file-append coreutils "/bin") ":"
                                 #+(file-append gawk "/bin") ":"
                                 #+(file-append tar "/bin") ":"
                                 #+(file-append diffutils "/bin")))

          (setvbuf (current-output-port) 'line)
          (setvbuf (current-error-port) 'line)

          (setenv "HOME" (getcwd))                ;for kpathsea/mktextfm

          ;; 'SOURCE_DATE_EPOCH' is honored by pdftex.
          (setenv "SOURCE_DATE_EPOCH" "1")

          (for-each (lambda (language)
                      (let ((opts `("--pdf"
                                    "-I" "."
                                    #$@options
                                    ,(if (string=? language "en")
                                         (string-append #$manual-source "/"
                                                        #$manual ".texi")
                                         (string-append #$manual-source "/"
                                                        #$manual "." language ".texi")))))
                        (format #t "building PDF manual for language '~a'...~%"
                                language)
                        (mkdir-p (string-append #$output "/"
                                                (normalize language)))
                        (setenv "LANGUAGE" language)


                        ;; FIXME: Unfortunately building PDFs for non-Latin
                        ;; alphabets doesn't work:
                        ;; <https://lists.gnu.org/archive/html/help-texinfo/2012-01/msg00014.html>.
                        (guard (c ((invoke-error? c)
                                   (format (current-error-port)
                                           "~%~%Failed to produce \
PDF for language '~a'!~%~%"
                                           language)))
                         (apply invoke #$(file-append texinfo "/bin/makeinfo")
                                "--pdf" "-o"
                                (string-append #$output "/"
                                               (normalize language)
                                               "/" #$manual
                                               (if (string=? language "en")
                                                   ""
                                                   (string-append "."
                                                                  language))
                                               ".pdf")
                                opts))))
                    '#$languages))))

  (computed-file (string-append manual "-pdf-manual") build))

(define (guix-manual-text-domain source languages)
  "Return the PO files for LANGUAGES of the 'guix-manual' text domain taken
from SOURCE."
  (define po-directory
    (file-append* source "/po/doc"))

  (define build
    (with-imported-modules '((guix build utils))
      #~(begin
          (use-modules (guix build utils))

          (mkdir-p #$output)
          (for-each (lambda (language)
                      (define directory
                        (string-append #$output "/" language
                                       "/LC_MESSAGES"))

                      (mkdir-p directory)
                      (invoke #+(file-append gnu-gettext "/bin/msgfmt")
                              "-c" "-o"
                              (string-append directory "/guix-manual.mo")
                              (string-append #$po-directory "/guix-manual."
                                             language ".po")))
                    '#$(delete "en" languages)))))

  (computed-file "guix-manual-po" build))

(define* (html-manual-indexes source
                              #:key (languages %languages)
                              (version "0.0")
                              (manual %manual)
                              (title (if (string=? "guix" manual)
                                         "GNU Guix Reference Manual"
                                         "GNU Guix Cookbook"))
                              (date 1))
  (define build
    (with-extensions (list guile-json-3)
      (with-imported-modules '((guix build utils))
        #~(begin
            (use-modules (guix build utils)
                         (json)
                         (ice-9 match)
                         (ice-9 popen)
                         (sxml simple)
                         (srfi srfi-1)
                         (srfi srfi-19))

            (define (normalize language)          ;XXX: deduplicate
              ;; Normalize LANGUAGE.  For instance, "zh_CN" becomes "zh-cn".
              (string-map (match-lambda
                            (#\_ #\-)
                            (chr chr))
                          (string-downcase language)))

            (define-syntax-rule (with-language language exp ...)
              (let ((lang (getenv "LANGUAGE")))
                (dynamic-wind
                  (lambda ()
                    (setenv "LANGUAGE" language)
                    (setlocale LC_MESSAGES))
                  (lambda () exp ...)
                  (lambda ()
                    (if lang
                        (setenv "LANGUAGE" lang)
                        (unsetenv "LANGUAGE"))
                    (setlocale LC_MESSAGES)))))

            ;; (put 'with-language 'scheme-indent-function 1)
            (define* (translate str language
                                #:key (domain "guix-manual"))
              (define exp
                `(begin
                   (bindtextdomain "guix-manual"
                                   #+(guix-manual-text-domain
                                      source
                                      languages))
                   (bindtextdomain "iso_639-3"    ;language names
                                   #+(file-append iso-codes
                                                  "/share/locale"))
                   (write (gettext ,str ,domain))))

              (with-language language
                ;; Since the 'gettext' function caches msgid translations,
                ;; regardless of $LANGUAGE, we have to spawn a new process each
                ;; time we want to translate to a different language.  Bah!
                (let* ((pipe (open-pipe* OPEN_READ
                                         #+(file-append guile-2.2
                                                        "/bin/guile")
                                         "-c" (object->string exp)))
                       (str  (read pipe)))
                  (close-pipe pipe)
                  str)))

            (define (seconds->string seconds language)
              (let* ((time (make-time time-utc 0 seconds))
                     (date (time-utc->date time)))
                (with-language language (date->string date "~e ~B ~Y"))))

            (define (guix-url path)
              (string-append #$%web-site-url path))

            (define (sxml-index language title body)
              ;; FIXME: Avoid duplicating styling info from guix-artwork.git.
              `(html (@ (lang ,language))
                     (head
                      (title ,(string-append title " — GNU Guix"))
                      (meta (@ (charset "UTF-8")))
                      (meta (@ (name "viewport") (content "width=device-width, initial-scale=1.0")))
                      ;; Menu prefetch.
                      (link (@ (rel "prefetch") (href ,(guix-url "menu/index.html"))))
                      ;; Base CSS.
                      (link (@ (rel "stylesheet") (href ,(guix-url "static/base/css/elements.css"))))
                      (link (@ (rel "stylesheet") (href ,(guix-url "static/base/css/common.css"))))
                      (link (@ (rel "stylesheet") (href ,(guix-url "static/base/css/messages.css"))))
                      (link (@ (rel "stylesheet") (href ,(guix-url "static/base/css/navbar.css"))))
                      (link (@ (rel "stylesheet") (href ,(guix-url "static/base/css/breadcrumbs.css"))))
                      (link (@ (rel "stylesheet") (href ,(guix-url "static/base/css/buttons.css"))))
                      (link (@ (rel "stylesheet") (href ,(guix-url "static/base/css/footer.css"))))

                      (link (@ (rel "stylesheet") (href ,(guix-url "static/base/css/page.css"))))
                      (link (@ (rel "stylesheet") (href ,(guix-url "static/base/css/post.css")))))
                     (body
                      (header (@ (class "navbar"))
                              (h1 (a (@ (class "branding")
                                        (href #$%web-site-url)))
                                  (span (@ (class "a11y-offset"))
                                        "Guix"))
                              (nav (@ (class "menu"))))
                      (nav (@ (class "breadcrumbs"))
                           (a (@ (class "crumb")
                                 (href #$%web-site-url))
                              "Home"))
                      ,body
                      (footer))))

            (define (language-index language)
              (define title
                (translate #$title language))

              (sxml-index
               language title
               `(main
                 (article
                  (@ (class "page centered-block limit-width"))
                  (h2 ,title)
                  (p (@ (class "post-metadata centered-text"))
                     #$version " — "
                     ,(seconds->string #$date language))

                  (div
                   (ul
                    (li (a (@ (href "html_node"))
                           "HTML, with one page per node"))
                    (li (a (@ (href
                               ,(string-append
                                 #$manual
                                 (if (string=? language
                                               "en")
                                     ""
                                     (string-append "."
                                                    language))
                                 ".html")))
                           "HTML, entirely on one page"))
                    ,@(if (member language '("ru" "zh_CN"))
                          '()
                          `((li (a (@ (href ,(string-append
                                              #$manual
                                              (if (string=? language "en")
                                                  ""
                                                  (string-append "."
                                                                 language))
                                              ".pdf"))))
                                "PDF")))))))))

            (define %iso639-languages
              (vector->list
               (assoc-ref (call-with-input-file
                              #+(file-append iso-codes
                                             "/share/iso-codes/json/iso_639-3.json")
                            json->scm)
                          "639-3")))

            (define (language-code->name code)
              "Return the full name of a language from its ISO-639-3 code."
              (let ((code (match (string-index code #\_)
                            (#f    code)
                            (index (string-take code index)))))
               (any (lambda (language)
                      (and (string=? (or (assoc-ref language "alpha_2")
                                         (assoc-ref language "alpha_3"))
                                     code)
                           (assoc-ref language "name")))
                    %iso639-languages)))

            (define (top-level-index languages)
              (define title #$title)
              (sxml-index
               "en" title
               `(main
                 (article
                  (@ (class "page centered-block limit-width"))
                  (h2 ,title)
                  (div
                   "This document is available in the following
languages:\n"
                   (ul
                    ,@(map (lambda (language)
                             `(li (a (@ (href ,(normalize language)))
                                     ,(translate
                                       (language-code->name language)
                                       language
                                       #:domain "iso_639-3"))))
                           languages)))))))

            (define (write-html file sxml)
              (call-with-output-file file
                (lambda (port)
                  (display "<!DOCTYPE html>\n" port)
                  (sxml->xml sxml port))))

            (setenv "GUIX_LOCPATH"
                    #+(file-append glibc-utf8-locales "/lib/locale"))
            (setenv "LC_ALL" "en_US.utf8")
            (setlocale LC_ALL "en_US.utf8")

            (for-each (lambda (language)
                        (define directory
                          (string-append #$output "/"
                                         (normalize language)))

                        (mkdir-p directory)
                        (write-html (string-append directory "/index.html")
                                    (language-index language)))
                      '#$languages)

            (write-html (string-append #$output "/index.html")
                        (top-level-index '#$languages))))))

  (computed-file "html-indexes" build))

(define* (pdf+html-manual source
                          #:key (languages %languages)
                          (version "0.0")
                          (date (time-second (current-time time-utc)))
                          (manual %manual))
  "Return the union of the HTML and PDF manuals, as well as the indexes."
  (directory-union (string-append manual "-manual")
                   (map (lambda (proc)
                          (proc source
                                #:date date
                                #:languages languages
                                #:version version
                                #:manual manual))
                        (list html-manual-indexes
                              html-manual pdf-manual))
                   #:copy? #t))

(define (latest-commit+date directory)
  "Return two values: the last commit ID (a hex string) for DIRECTORY, and its
commit date (an integer)."
  (let* ((repository (repository-open directory))
         (head       (repository-head repository))
         (oid        (reference-target head))
         (commit     (commit-lookup repository oid)))
    ;; TODO: Use (git describe) when it's widely available.
    (values (oid->string oid) (commit-time commit))))


(let* ((root (canonicalize-path
              (string-append (current-source-directory) "/..")))
       (commit date (latest-commit+date root)))
  (format (current-error-port)
          "building manual from work tree around commit ~a, ~a~%"
          commit
          (let* ((time (make-time time-utc 0 date))
                 (date (time-utc->date time)))
            (date->string date "~e ~B ~Y")))
  (pdf+html-manual (local-file root "guix" #:recursive? #t
                               #:select? (git-predicate root))
                   #:version (or (getenv "GUIX_MANUAL_VERSION")
                                 (string-take commit 7))
                   #:date date))