;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2019 Ludovic Courtès ;;; ;;; 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 . ;; 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=")) (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 ;; "

foo

\n
", ;; 'html->shtml' would mistakenly close 'blockquote' right ;; before

. 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

 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"   "⇒")
                ("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 
                   (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:
                        ;; .
                        (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)
                              (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 "GNU Guix Reference Manual" 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
                "GNU Guix Reference Manual")
              (sxml-index
               "en" title
               `(main
                 (article
                  (@ (class "page centered-block limit-width"))
                  (h2 ,title)
                  (div
                   "The GNU Guix Reference Manual 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 "\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))