gnu/packages/docbook.scm


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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
;;; Copyright © 2016 Mathieu Lirzin <mthl@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/>.

(define-module (gnu packages docbook)
  #:use-module (gnu packages)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages imagemagick)
  #:use-module (gnu packages inkscape)
  #:use-module (gnu packages tex)
  #:use-module (gnu packages python)
  #:use-module (gnu packages base)
  #:use-module (gnu packages xml)
  #:use-module (guix licenses)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix build-system trivial)
  #:use-module (guix build-system python))

(define-public docbook-xml
  (package
    (name "docbook-xml")
    (version "4.5")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://www.docbook.org/xml/" version
                                  "/docbook-xml-" version ".zip"))
              (sha256
               (base32
                "1d671lcjckjri28xfbf6dq7y3xnkppa910w1jin8rjc35dx06kjf"))))
    (build-system trivial-build-system)
    (arguments
     '(#:builder (begin
                   (use-modules (guix build utils))

                   (let* ((unzip
                           (string-append (assoc-ref %build-inputs "unzip")
                                          "/bin/unzip"))
                          (source (assoc-ref %build-inputs "source"))
                          (out    (assoc-ref %outputs "out"))
                          (dtd    (string-append out "/xml/dtd/docbook")))
                     (mkdir-p dtd)
                     (with-directory-excursion dtd
                       (system* unzip source))
                     (substitute* (string-append out "/xml/dtd/docbook/catalog.xml")
                       (("uri=\"") 
                        (string-append 
                         "uri=\"file://" dtd "/")))))
                 #:modules ((guix build utils))))
    (native-inputs `(("unzip" ,unzip)))
    (home-page "http://docbook.org")
    (synopsis "DocBook XML DTDs for document authoring")
    (description
     "DocBook is general purpose XML and SGML document type particularly well
suited to books and papers about computer hardware and software (though it is
by no means limited to these applications.)  This package provides XML DTDs.")
    (license (x11-style "" "See file headers."))))

(define-public docbook-xml-4.4
  (package (inherit docbook-xml)
    (version "4.4")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://www.docbook.org/xml/" version
                                  "/docbook-xml-" version ".zip"))
              (sha256
               (base32
                "141h4zsyc71sfi2zzd89v4bb4qqq9ca1ri9ix2als9f4i3mmkw82"))))))

(define-public docbook-xml-4.3
  (package (inherit docbook-xml)
    (version "4.3")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://www.docbook.org/xml/" version
                                  "/docbook-xml-" version ".zip"))
              (sha256
               (base32
                "0r1l2if1z4wm2v664sqdizm4gak6db1kx9y50jq89m3gxaa8l1i3"))))))

(define-public docbook-xml-4.2
  (package (inherit docbook-xml)
    (version "4.2")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://www.docbook.org/xml/" version
                                  "/docbook-xml-" version ".zip"))
              (sha256
               (base32
                "18hgwvmywh6a5jh38szjmg3hg2r4v5lb6r3ydc3rd8cp9wg61i5c"))))))

(define-public docbook-xml-4.1.2
  (package (inherit docbook-xml)
    (version "4.1.2")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://www.docbook.org/xml/" version
                                  "/docbkx412.zip"))
              (sha256
               (base32
                "0wkp5rvnqj0ghxia0558mnn4c7s3n501j99q2isp3sp0ci069w1h"))))
    (arguments
     '(#:modules ((guix build utils))
       #:builder
       (begin
         (use-modules (guix build utils))
         (let ((source (assoc-ref %build-inputs "source"))
               (unzip  (string-append (assoc-ref %build-inputs "unzip")
                                      "/bin/unzip"))
               (dtd    (string-append (assoc-ref %outputs "out")
                                      "/xml/dtd/docbook")))
           (mkdir-p dtd)
           (zero? (system* unzip source "-d" dtd))))))))

(define-public docbook-xsl
  (package
    (name "docbook-xsl")
    (version "1.79.1")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://sourceforge/docbook/docbook-xsl/"
                                  version "/docbook-xsl-" version ".tar.bz2"))
              (sha256
               (base32
                "0s59lihif2fr7rznckxr2kfyrvkirv76r1zvidp9b5mj28p4apvj"))))
    (build-system trivial-build-system)
    (arguments
     `(#:builder (let ((name-version (string-append ,name "-" ,version)))
                   (use-modules (guix build utils))

                   (let* ((bzip2  (assoc-ref %build-inputs "bzip2"))
                          (tar    (assoc-ref %build-inputs "tar"))
                          (source (assoc-ref %build-inputs "source"))
                          (out    (assoc-ref %outputs "out"))
                          (xsl    (string-append out "/xml/xsl")))
                     (setenv "PATH" (string-append bzip2 "/bin"))
                     (system* (string-append tar "/bin/tar") "xvf" source)

                     (mkdir-p xsl)
                     (copy-recursively name-version
                                       (string-append xsl "/" name-version))

                     (substitute* (string-append xsl "/" name-version "/catalog.xml")
                       (("rewritePrefix=\"./")
                        (string-append "rewritePrefix=\"file://" xsl "/"
                                       name-version "/")))))
                 #:modules ((guix build utils))))
    (native-inputs `(("bzip2" ,bzip2)
                     ("tar" ,tar)))
    (home-page "http://docbook.org")
    (synopsis "DocBook XSL style sheets for document authoring")
    (description
     "This package provides XSL style sheets for DocBook.")
    (license (x11-style "" "See 'COPYING' file."))))

(define-public dblatex
  (package
    (name "dblatex")
    (version "0.3.9")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://sourceforge/dblatex/dblatex/"
                                  "dblatex-" version "/dblatex-"
                                  version ".tar.bz2"))
              (sha256
               (base32
                "0pdizc5rjywwzxa1qqhdmba5zr35pbmdwbysalsid7xw87w3kq06"))
              (patches (search-patches "dblatex-remove-multirow.patch"))))
    (build-system python-build-system)
    ;; TODO: Add xfig/transfig for fig2dev utility
    (inputs
     `(("texlive" ,(texlive-union (list texlive-latex-amsfonts
                                        texlive-latex-anysize
                                        texlive-latex-appendix
                                        texlive-latex-changebar
                                        texlive-latex-colortbl
                                        texlive-latex-eepic
                                        texlive-latex-eso-pic
                                        texlive-latex-fancybox
                                        texlive-latex-fancyhdr
                                        texlive-latex-fancyvrb
                                        texlive-latex-float
                                        texlive-latex-footmisc
                                        texlive-latex-hyperref
                                        texlive-latex-jknapltx
                                        texlive-latex-listings
                                        texlive-latex-multirow
                                        texlive-latex-oberdiek
                                        texlive-latex-overpic
                                        texlive-latex-pdfpages
                                        texlive-latex-subfigure
                                        texlive-latex-titlesec
                                        texlive-latex-url
                                        texlive-latex-wasysym

                                        texlive-fonts-amsfonts
                                        texlive-fonts-ec
                                        texlive-fonts-rsfs
                                        texlive-fonts-stmaryrd

                                        texlive-generic-ifxetex)))
       ("imagemagick" ,imagemagick)     ;for convert
       ("inkscape" ,inkscape)           ;for svg conversion
       ("docbook" ,docbook-xml)
       ("libxslt" ,libxslt)))           ;for xsltproc
    (arguments
     `(#:python ,python-2               ;'print' syntax
       ;; Using setuptools causes an invalid "package_base" path in
       ;; out/bin/.dblatex-real due to a missing leading '/'.  This is caused
       ;; by dblatex's setup.py stripping the root path when creating the
       ;; script.  (dblatex's setup.py still uses distutils and thus has to
       ;; create the script by itself. The feature for creating scripts is one
       ;; of setuptools' features.)
       ;; See this thread for details:
       ;; https://lists.gnu.org/archive/html/guix-devel/2016-12/msg00030.html
       #:use-setuptools? #f
       #:tests? #f                      ;no 'test' command
       #:phases
       (alist-cons-after
        'wrap 'set-path
        (lambda* (#:key inputs outputs #:allow-other-keys)
          (let ((out (assoc-ref outputs "out")))
            ;; dblatex executes helper programs at runtime.
            (wrap-program (string-append out "/bin/dblatex")
                          `("PATH" ":" prefix
                            ,(map (lambda (input)
                                    (string-append (assoc-ref inputs input)
                                                   "/bin"))
                                  '("libxslt" "texlive"
                                    "imagemagick" "inkscape"))))))
        %standard-phases)))
    (home-page "http://dblatex.sourceforge.net")
    (synopsis "DocBook to LaTeX Publishing")
    (description
     "DocBook to LaTeX Publishing transforms your SGML/XML DocBook documents
to DVI, PostScript or PDF by translating them in pure LaTeX as a first
process.  MathML 2.0 markups are supported too.  It started as a clone of
DB2LaTeX.")
    ;; lib/contrib/which is under an X11 license
    (license gpl2+)))
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2020 Björn Höfling <bjoern.hoefling@bjoernhoefling.de>
;;;
;;; 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 compression)
             (gnu packages gawk)
             (gnu packages gettext)
             (gnu packages guile)
             (gnu packages guile-xyz)
             (gnu packages iso-codes)
             (gnu packages texinfo)
             (gnu packages tex)
             (ice-9 match)
             (srfi srfi-1)
             (srfi srfi-19)
             (srfi srfi-26)
             (srfi srfi-71))

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

(define translated-texi-manuals
  (let ((translated (@@ (guix self) translate-texi-manuals)))
    (lambda (source)
      (let ((result (translated source)))
        ;; Build with 'guile-3.0-latest', which is linked against
        ;; 'libgc/disable-munmap', to avoid the dreaded "mmap(PROT_NONE)
        ;; failed" crash: <https://bugs.gnu.org/47428>.
        (computed-file (computed-file-name result)
                       (computed-file-gexp result)
                       #:options (computed-file-options result)
                       #:guile guile-3.0-latest)))))

(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
  ;; The cookbook is not translated in the same languages as the manual
  (if (string=? %manual "guix-cookbook")
      '("de" "en" "fr")
      '("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|json)$")
                            (find-files #$(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 (normalize-language-code language)        ;XXX: deduplicate
  ;; Normalize LANGUAGE.  For instance, "zh_CN" becomes "zh-cn".
  (string-map (match-lambda
                (#\_ #\-)
                (chr chr))
              (string-downcase language)))

(define* (html-manual-identifier-index manual base-url
                                       #:key
                                       (name "html-manual-identifier-index"))
  "Return an index of all the identifiers that appear in MANUAL, a
makeinfo-generated manual.  The index is a file that contains an alist; each
key is an identifier and the associated value is the URL reference pointing to
that identifier.  The URL is constructed by concatenating BASE-URL to the
actual file name."
  (define build
    (with-extensions (list guile-lib)
      (with-imported-modules '((guix build utils))
        #~(begin
            (use-modules (guix build utils)
                         (htmlprag)
                         (srfi srfi-1)
                         (srfi srfi-26)
                         (ice-9 ftw)
                         (ice-9 match)
                         (ice-9 threads)
                         (ice-9 pretty-print))

            (%strict-tokenizer? #t)

            (define file-url
              (let ((prefix (string-append #$manual "/")))
                (lambda (file)
                  ;; Return the URL for FILE.
                  (let ((file (string-drop file (string-length prefix)))
                        (base #$base-url))
                    (if (string-null? base)
                        file
                        (string-append base "/" file))))))

            (define (underscore-decode str)
              ;; Decode STR, an "underscore-encoded" string as produced by
              ;; makeinfo for indexes, such as "_0025base_002dservices" for
              ;; "%base-services".
              (let loop ((str str)
                         (result '()))
                (match (string-index str #\_)
                  (#f
                   (string-concatenate-reverse (cons str result)))
                  (index
                   (let ((char (string->number
                                (substring str (+ index 1) (+ index 5))
                                16)))
                     (loop (string-drop str (+ index 5))
                           (append (list (string (integer->char char))
                                         (string-take str index))
                                   result)))))))

            (define (anchor-id->key id)
              ;; Convert ID, an anchor ID such as
              ;; "index-pam_002dlimits_002dservice" to the corresponding key,
              ;; "pam-limits-service" in this example.  Drop the suffix of
              ;; duplicate anchor IDs like "operating_002dsystem-1".
              (let ((id (if (any (cut string-suffix? <> id)
                                 '("-1" "-2" "-3" "-4" "-5"))
                            (string-drop-right id 2)
                            id)))
                (underscore-decode
                 (string-drop id (string-length "index-")))))

            (define* (collect-anchors file #:optional (anchors '()))
              ;; Collect the anchors that appear in FILE, a makeinfo-generated
              ;; file.  Grab those from <dt> tags, which corresponds to
              ;; Texinfo @deftp, @defvr, etc.  Return ANCHORS augmented with
              ;; more name/reference pairs.
              (define string-or-entity?
                (match-lambda
                  ((? string?) #t)
                  (('*ENTITY* _ ...) #t)
                  (_ #f)))

              (define (worthy-entry? lst)
                ;; Attempt to match:
                ;;   Scheme Variable: <strong>x</strong>
                ;; but not:
                ;;   <code>cups-configuration</code> parameter: …
                (let loop ((lst lst))
                  (match lst
                    (((? string-or-entity?) rest ...)
                     (loop rest))
                    ((('strong _ ...) _ ...)
                     #t)
                    ((('span ('@ ('class "symbol-definition-category"))
                             (? string-or-entity?) ...) rest ...)
                     #t)
                    (x
                     #f))))

              (let ((shtml (call-with-input-file file html->shtml)))
                (let loop ((shtml shtml)
                           (anchors anchors))
                  (match shtml
                    (('dt ('@ ('id id) _ ...) rest ...)
                     (if (and (string-prefix? "index-" id)
                              (worthy-entry? rest))
                         (alist-cons (anchor-id->key id)
                                     (string-append (file-url file)
                                                    "#" id)
                                     anchors)
                         anchors))
                    ((tag ('@ _ ...) body ...)
                     (fold loop anchors body))
                    ((tag body ...)
                     (fold loop anchors body))
                    (_ anchors)))))

            (define (html-files directory)
              ;; Return the list of HTML files under DIRECTORY.
              (map (cut string-append directory "/" <>)
                   (scandir #$manual (lambda (file)
                                       (string-suffix? ".html" file)))))

            (define anchors
              (sort (concatenate
                     (n-par-map (parallel-job-count)
                                (cut collect-anchors <>)
                                (html-files #$manual)))
                    (match-lambda*
                      (((key1 . url1) (key2 . url2))
                       (if (string=? key1 key2)
                           (string<? url1 url2)
                           (string<? key1 key2))))))

            (call-with-output-file #$output
              (lambda (port)
                (display ";; Identifier index for the manual.\n\n"
                         port)
                (pretty-print anchors port)))))))

  (computed-file name build))

(define* (html-identifier-indexes manual directory-suffix
                                  #:key (languages %languages)
                                  (manual-name %manual)
                                  (base-url (const "")))
  (map (lambda (language)
         (let ((language (normalize-language-code language)))
           (list language
                 (html-manual-identifier-index
                  (file-append manual "/" language directory-suffix)
                  (base-url language)
                  #:name (string-append manual-name "-html-index-"
                                        language)))))
       languages))

(define* (syntax-highlighted-html input
                                  #:key
                                  (name "highlighted-syntax")
                                  (languages %languages)
                                  (mono-node-indexes
                                   (html-identifier-indexes input ""
                                                            #:languages
                                                            languages))
                                  (split-node-indexes
                                   (html-identifier-indexes input
                                                            "/html_node"
                                                            #:languages
                                                            languages))
                                  (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 guile-syntax-highlight)
      (with-imported-modules '((guix build utils))
        #~(begin
            (use-modules (htmlprag)
                         (syntax-highlight)
                         (syntax-highlight scheme)
                         (syntax-highlight lexers)
                         (guix build utils)
                         (srfi srfi-1)
                         (srfi srfi-26)
                         (ice-9 match)
                         (ice-9 threads)
                         (ice-9 vlist))

            (%strict-tokenizer? #t)

            (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 anchors)
              ;; Like 'highlights->sxml', but handle nested 'paren tags.  This
              ;; allows for paren matching highlights via appropriate CSS
              ;; "hover" properties.  When a symbol is encountered, look it up
              ;; in ANCHORS, a vhash, and emit the corresponding href, if any.
              (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 anchors))
                             ,close))
                     (('symbol text)
                      ;; Check whether we can emit a hyperlink for TEXT.
                      (match (vhash-assoc text anchors)
                        (#f
                         `(span (@ (class ,(tag->class 'symbol))) ,text))
                        ((_ . target)
                         `(a (@ (class ,(tag->class 'symbol)) (href ,target))
                             ,text))))
                     ((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))
                  ((('var name) . rest)           ;for @var{name} within @lisp
                   (loop rest (cons name strings))) ;XXX: losing formatting
                  (something
                   (pk 'unsupported-code-snippet something)
                   (primitive-exit 1)))))

            (define (highlight-definition id category symbol args)
              ;; Produce stylable HTML for the given definition (an @deftp,
              ;; @deffn, or similar).
              `(dt (@ (id ,id) (class "symbol-definition"))
                   (span (@ (class "symbol-definition-category"))
                         ,@category)
                   (span (@ (class "symbol-definition-prototype"))
                         ,symbol " " ,@args)))

            (define (space? obj)
              (and (string? obj)
                   (string-every char-set:whitespace obj)))

            (define (syntax-highlight sxml anchors)
              ;; Recurse over SXML and syntax-highlight code snippets.
              (let loop ((sxml sxml))
                (match sxml
                  (('*TOP* decl body ...)
                   `(*TOP* ,decl ,@(map loop 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)))
                            anchors)))

                  ;; Replace the ugly <strong> used for @deffn etc., which
                  ;; translate to <dt>, with more stylable markup.
                  (('dt (@ ('id id)) category ... ('strong thing))
                   (highlight-definition id category thing '()))
                  (('dt (@ ('id id)) category ... ('strong thing)
                        (? space?) ('em args ...))
                   (highlight-definition id category thing args))

                  ((tag ('@ attributes ...) body ...)
                   `(,tag (@ ,@attributes) ,@(map loop body)))
                  ((tag body ...)
                   `(,tag ,@(map loop body)))
                  ((? string? str)
                   str))))

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

            (define (html? file stat)
              (string-suffix? ".html" file))

            (define language+node-anchors
              (match-lambda
                ((language files ...)
                 (cons language
                       (fold (lambda (file vhash)
                               (let ((alist (call-with-input-file file read)))
                                 ;; Use 'fold-right' so that the first entry
                                 ;; wins (e.g., "car" from "Pairs" rather than
                                 ;; from "rnrs base" in the Guile manual).
                                 (fold-right (match-lambda*
                                               (((key . value) vhash)
                                                (vhash-cons key value vhash)))
                                             vhash
                                             alist)))
                             vlist-null
                             files)))))

            (define mono-node-anchors
              ;; List of language/vhash pairs, where each vhash maps an
              ;; identifier to the corresponding URL in a single-page manual.
              (map language+node-anchors '#$mono-node-indexes))

            (define multi-node-anchors
              ;; Likewise for split-node manuals.
              (map language+node-anchors '#$split-node-indexes))

            ;; 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")

            ;; First process the mono-node 'guix.html' files.
            (for-each (match-lambda
                        ((language . anchors)
                         (let ((files (find-files
                                       (string-append #$input "/" language)
                                       "^guix(-cookbook|)(\\.[a-zA-Z_-]+)?\\.html$")))
                           (n-par-for-each (parallel-job-count)
                                           (cut process-html <> anchors)
                                           files))))
                      mono-node-anchors)

            ;; Process the multi-node HTML files.
            (for-each (match-lambda
                        ((language . anchors)
                         (let ((files (find-files
                                       (string-append #$input "/" language
                                                      "/html_node")
                                       "\\.html$")))
                           (n-par-for-each (parallel-job-count)
                                           (cut process-html <> anchors)
                                           files))))
                      multi-node-anchors)

            ;; Last, copy non-HTML files as is.
            (for-each copy-as-is
                      (find-files #$input (negate html?)))))))

  (computed-file name build))

(define* (html-manual source #:key (languages %languages)
                      (version "0.0")
                      (manual %manual)
                      (mono-node-indexes (map list languages))
                      (split-node-indexes (map list languages))
                      (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)

          ;; 'makeinfo' looks for "htmlxref.cnf" in the current directory, so
          ;; copy it right here.
          (copy-file (string-append #$manual-source "/htmlxref.cnf")
                     "htmlxref.cnf")

          (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
                             #:mono-node-indexes mono-node-indexes
                             #:split-node-indexes split-node-indexes
                             #: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 a separate 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)))
                          (mono-node-indexes (map list %languages))
                          (split-node-indexes (map list %languages))
                          (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
                              (lambda (source . args)
                                (apply html-manual source
                                       #:mono-node-indexes mono-node-indexes
                                       #:split-node-indexes split-node-indexes
                                       args))
                              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))))


;;;
;;; Guile manual.
;;;

(define guile-manual
  ;; The Guile manual as HTML, including both the mono-node "guile.html" and
  ;; the split-node "html_node" directory.
  (let ((guile guile-3.0-latest))
    (computed-file (string-append "guile-manual-" (package-version guile))
                   (with-imported-modules '((guix build utils))
                     #~(begin
                         (use-modules (guix build utils)
                                      (ice-9 match))

                         (setenv "PATH"
                                 (string-append #+tar "/bin:"
                                                #+xz "/bin:"
                                                #+texinfo "/bin"))
                         (invoke "tar" "xf" #$(package-source guile))
                         (mkdir-p (string-append #$output "/en/html_node"))

                         (let* ((texi (find-files "." "^guile\\.texi$"))
                                (documentation (match texi
                                                 ((file) (dirname file)))))
                           (with-directory-excursion documentation
                             (invoke "makeinfo" "--html" "--no-split"
                                     "-o" (string-append #$output
                                                         "/en/guile.html")
                                     "guile.texi")
                             (invoke "makeinfo" "--html" "-o" "split"
                                     "guile.texi")
                             (copy-recursively
                              "split"
                              (string-append #$output "/en/html_node")))))))))

(define %guile-manual-base-url
  "https://www.gnu.org/software/guile/manual")

(define (for-all-languages index)
  (map (lambda (language)
         (list language index))
       %languages))

(define guile-mono-node-indexes
  ;; The Guile manual is only available in English so use the same index in
  ;; all languages.
  (for-all-languages
   (html-manual-identifier-index (file-append guile-manual "/en")
                                 %guile-manual-base-url
                                 #:name "guile-html-index-en")))

(define guile-split-node-indexes
  (for-all-languages
   (html-manual-identifier-index (file-append guile-manual "/en/html_node")
                                 (string-append %guile-manual-base-url
                                                "/html_node")
                                 #:name "guile-html-index-en")))

(define (merge-index-alists alist1 alist2)
  "Merge ALIST1 and ALIST2, both of which are list of tuples like:

  (LANGUAGE INDEX1 INDEX2 ...)

where LANGUAGE is a string like \"en\" and INDEX1 etc. are indexes as returned
by 'html-identifier-indexes'."
  (let ((languages (delete-duplicates
                    (append (match alist1
                              (((languages . _) ...)
                               languages))
                            (match alist2
                              (((languages . _) ...)
                               languages))))))
    (map (lambda (language)
           (cons language
                 (append (or (assoc-ref alist1 language) '())
                         (or (assoc-ref alist2 language) '()))))
         languages)))


(let* ((root (canonicalize-path
              (string-append (current-source-directory) "/..")))
       (commit date (latest-commit+date root))
       (version (or (getenv "GUIX_MANUAL_VERSION")
                    (string-take commit 7)))
       (select? (let ((vcs? (git-predicate root)))
                  (lambda (file stat)
                    (and (vcs? file stat)
                         ;; Filter out this file.
                         (not (string=? (basename file) "build.scm"))))))
       (source (local-file root "guix" #:recursive? #t
                           #:select? select?)))

  (define guix-manual
    (html-manual source
                 #:manual "guix"
                 #:version version
                 #:date date))

  (define guix-mono-node-indexes
    ;; Alist of indexes for GUIX-MANUAL, where each key is a language code and
    ;; each value is a file-like object containing the identifier index.
    (html-identifier-indexes guix-manual ""
                             #:manual-name "guix"
                             #:base-url (if (string=? %manual "guix")
                                            (const "")
                                            (cut string-append
                                              "/manual/devel/" <>))
                             #:languages %languages))

  (define guix-split-node-indexes
    ;; Likewise for the split-node variant of GUIX-MANUAL.
    (html-identifier-indexes guix-manual "/html_node"
                             #:manual-name "guix"
                             #:base-url (if (string=? %manual "guix")
                                            (const "")
                                            (cut string-append
                                              "/manual/devel/" <>
                                              "/html_node"))
                             #:languages %languages))

  (define mono-node-indexes
    (merge-index-alists guix-mono-node-indexes guile-mono-node-indexes))

  (define split-node-indexes
    (merge-index-alists guix-split-node-indexes guile-split-node-indexes))

  (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 source
                   ;; Always use the identifier indexes of GUIX-MANUAL and
                   ;; GUILE-MANUAL.  Both "guix" and "guix-cookbook" can
                   ;; contain links to definitions that appear in either of
                   ;; these two manuals.
                   #:mono-node-indexes mono-node-indexes
                   #:split-node-indexes split-node-indexes
                   #:version version
                   #:date date))