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;;; pelzflorian.de website sources.
;;; Copyright © 2017 Florian Pelz
;;;
;;; This program 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.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program.  If not, see <http://www.gnu.org/licenses/>.

;;; This site is built with Haunt. See https://haunt.dthompson.us/ for
;;; instructions on where to get Haunt or just use your distribution’s
;;; package manager.
;;; Once Haunt is installed, just run `haunt build` inside the directory
;;; containing this file. TODO Well no because of translations, see the file NOTES.

;;; If you wish to contact me, find my contact information on:
;;; https://pelzflorian.de

;;; Sorry that some code here currently isn’t pretty yet.
;;; TODO Format strings should be used for internationalization.
;;; TODO Properly wrap newlines with \ at the end of a line in strings.
;;; TODO Switch to the Meson build system and update the above comment accordingly.

(use-modules
 (gettext-po)
 (system ffi-help-rt)
 ((system foreign)
         #:prefix ffi:)
 (ice-9 match)
 (ice-9 regex)
 (srfi srfi-1)
 (srfi srfi-19)
 (haunt asset)
 (haunt html)
 (haunt page)
 (haunt post)
 (haunt reader)
 (haunt site)
 (haunt builder assets)
 (haunt builder atom)
 (haunt builder blog))

(define linguas
  (list "de"
        "en"))

(define (xerror-handler severity message filename lineno column multiline-p1 message-text)
  (display "xerror occurred!"))
(define ~xerror-handler
  (ffi:procedure->pointer
   ffi:void
   xerror-handler
   (list ffi:int
         '*
         '*
         ffi:size_t
         ffi:size_t
         ffi:int
         '*)))

;;; TODO USE SIMPLE-FORMAT AND DISPLAY ERRORS PROPERLY

(define (xerror2-handler severity message
                         filename1 lineno1 column1 multiline-p1 message-text1
                         filename2 lineno2 column2 multiline-p2 message-text2)
  (display "xerror occurred!"))
(define ~xerror2-handler
  (ffi:procedure->pointer
   ffi:void
   xerror2-handler
   (list ffi:int
         '*
         '*
         ffi:size_t
         ffi:size_t
         ffi:int
         '*
         '*
         '*
         ffi:size_t
         ffi:size_t
         ffi:int
         '*)))

(define xerror-handler-struct
  (let ((new (make-struct-po_xerror_handler)))
    (begin
      (fh-object-set! new 'xerror (ffi:pointer-address ~xerror-handler))
      (fh-object-set! new 'xerror2 (ffi:pointer-address ~xerror2-handler))
      new)))

(define (translations-for-lingua lingua)
  "Returns po/<lingua>.po converted to an association list of msgid–msgstr pairs."
  ;; TODO: STILL DISREGARDING PLURALS AND OTHER INFORMATION
  (let* ((po-file
          (po_file_read_v3
           (string-append "po/" lingua ".po")
           (pointer-to xerror-handler-struct)))
         (translations
          (if (ffi:null-pointer? (unwrap~pointer po-file))
              '()
              ;; otherwise:
              (let ((iter (po_message_iterator po-file ffi:%null-pointer)))
                (let loop ((message (po_next_message iter)))
                  (if (ffi:null-pointer? (unwrap~pointer message))
                      (begin
                        (po_message_iterator_free iter)
                        '())
                      ;; otherwise:
                      (cons
                       (cons
                        (ffi:pointer->string (po_message_msgid message))
                        (ffi:pointer->string (po_message_msgstr message)))
                       (loop (po_next_message iter)))))))))
    (if (not (ffi:null-pointer? (unwrap~pointer po-file)))
        (po_file_free po-file))
    translations))

(define (translations-entry-for-lingua lingua)
  "Returns a pair of LINGUA and an association list of its translations."
  (cons
   lingua
   (translations-for-lingua lingua)))

(define translated-msg
  ;; gettext is not used directly because it would require repeated
  ;; setlocale calls, which should not be necessary.
  ;; See: https://stackoverflow.com/questions/3398113/php-gettext-problems
  (let ((translation-lists
         (map translations-entry-for-lingua linguas)))
    (define (with-default value default)
      (if value value
          default))
    (lambda (msgid lingua)
      "Returns the msgstr for MSGID from the po file for LINGUA."
      (let ((translations (assoc-ref translation-lists lingua)))
        (with-default
         (assoc-ref translations msgid)
         msgid)))))

;; TODO: Unused translations; incorporate into po file later:
;;
;;            ("Unsigned " . "Unsignierte ")
;;            ("macOS binaries (10.10 Yosemite or newer)" . "macOS-binärdateien (10.10 Yosemite oder neuer)")
;;            (" if you are still using macOS (you may need to follow the instructions
;; +from the macOS error messages on how to make macOS trust the binaries)." . ", falls
;; Sie noch immer macOS benutzen (eventuell müssen Sie den instructionen aus den macOS-fehlermeldungen,
;; wie sie macOS dazu bringen, den binärdateien zu vertrauen, folgen).")

(define-syntax _
  (lambda (x)
    "Gettext-like shorthand for translated-msg with what currently is current-lingua."
    (syntax-case x ()
      ((_ msg)
       (with-syntax ((current-lingua (datum->syntax x 'current-lingua)))
                    #'(translated-msg msg current-lingua))))))

(define (date->string-for-lingua date lingua)
  "Custom date->string* variant that deals with lingua and my no longer common German language \
orthographic preferences."
  (match lingua
         ("de"
          (string-append
           (case (date-week-day date)
             ((0) "Sonntag")
             ((1) "Montag")
             ((2) "Dienstag")
             ((3) "Mittwoch")
             ((4) "Donnerstag")
             ((5) "Freitag")
             ((6) "Samstag"))
           ", der "
           (number->string (date-day date))
           ". "
           (case (date-month date)
             ((1) "januar")
             ((2) "februar")
             ((3) "märz")
             ((4) "april")
             ((5) "mai")
             ((6) "juni")
             ((7) "juli")
             ((8) "august")
             ((9) "september")
             ((10) "october")
             ((11) "november")
             ((12) "december"))
           " "
           (number->string (date-year date))))
         ("en"
          (date->string* date))))

(define css-dir "css")
(define feeds-dir "feeds")
(define files-dir "files")
(define image-dir "images")
(define posts-dir "posts")
(define uni-dir "uni")

(define (build-url . path-list)
  "Make a string from path-list with a slash before each component."
  (string-join path-list "/" 'prefix))

(define (a-href-list-element url link-content)
  "A list element with a link."
  `(li
    (a (@ (href ,url)
          (class "full-width-link"))
       ,link-content)))

(define (a-href-sidebar-element url link-content)
  "A list element with a link."
  `(li
    (a (@ (href ,url)
          (class "sidebar-conditional-full-width-link"))
       ,link-content)))

(define (a-href-multi-list-element pairs link-content)
  "A list element linking to multiple formats. Pairs should be a list of pairs each consisting of a file extension and a url."
  `(li ,link-content
       ,@(map (lambda (pair)
                `(span
                  " "
                  "("
                  (span
                   (@ (class "file-extension"))
                   (a
                    (@ (href ,(cdr pair)))
                    ,(car pair)))
                  ")"))
              pairs)))

(define (screenshot src title)
  "SXML for a screenshot; should use a thumbnail." ; TODO
  `(a (@ (href ,src)
         (title ,title))
      (img (@ (class "horizontally-padded-wide")
              (src ,src)
              (width "300")
              (alt (string-append "Screenshot: " ,title))))))

(define (back-button-for-lingua lingua)
  "SXML for a link back to the home page."
  (let ((current-lingua lingua))
    `(a (@ (href ,(string-append "/index" "-" lingua ".html"))
           (class "full-width-link"))
        ,(_ "← Back to home page"))))

(define (recent-post-link-for-lingua lingua)
  "SXML for a link to all other posts in this lingua."
  (let ((current-lingua lingua))
    `(a (@ (href ,(build-url posts-dir
                             current-lingua
                             "index.html")))
        ,(_ "See other posts"))))

(define (recent-post-link-for-tag-for-lingua tag description lingua)
  "SXML for a link to posts with a certain tag."
  (let ((current-lingua lingua))
    `(a (@ (href ,(build-url feeds-dir
                             current-lingua
                             (string-append
                              tag
                              ".xml"))))
        ,(_ "See other posts about ")
        ,description)))

(define (tags-for-post-for-lingua post lingua)
  "SXML for a list of tags of a post."
  (let ((tags (sort (post-ref post 'tags) string-ci<?))
        (current-lingua lingua))
    (if (not (null? tags))
        `(div
          ,(_ "Tags:")
          ,@(map (lambda (tag)
                   `(span (@ (class "horizontally-padded"))
                          (a (@ (href
                                 ,(build-url feeds-dir
                                             current-lingua
                                             (string-append
                                              tag
                                              ".xml"))))
                             ,tag)))
                 tags))
        "")))

(define (format-post-for-lingua post lingua)
  "SXML including the content of the post, or nothing if post is not a post."
  (if (post? post)
      `(div
        (h1 (a (@ (href ,(build-url posts-dir
                                    lingua
                                    (string-append
                                     (post-slug post)
                                     ".html"))))
               ,(post-ref post 'title)))
        (h2 ,(date->string-for-lingua
              (post-date post) lingua))
        (div
         ,(post-sxml post)))
      "")) ; don’t print any posts if there are no posts yet

(define* (pelzflorian-blue-layout current-lingua #:optional (is-homepage? #f))
  "Template layout for all the blog’s pages. If is-homepage is set, shows no back button."
  (lambda (site title body)
    (define (link-to-css filename)
      `(link
        (@ (rel "stylesheet")
           (type "text/css")
           (href ,(build-url css-dir filename)))))
    (define (link-to-feed lingua)
      (let ((current-lingua lingua))
        `(link
          (@ (rel "alternate")
             (type "application/atom+xml")
             (title ,(_ "My blog in English"))
             (hreflang ,lingua)
             (href
              ,(build-url feeds-dir lingua "feed.xml"))))))
    `((doctype "html")
      (html
       (@ (lang ,(_ "@ietf-lang-tag")))
       (head
        (meta (@ (charset "utf-8")))
        ;; remove ASAP once @viewport becomes normative in CSS:
        (meta (@ (name "viewport")
                 (content "width=device-width, initial-scale=1")))
        (title ,(string-join `(,title "–" ,(site-title site))))
        (link
         (@ (rel "icon")
            (type "image/png")
            (href
             ,(build-url image-dir "favicon.png"))))
        ;; reference Atom feeds for all linguas, current lingua on top
        ,(link-to-feed current-lingua)
        ,(map (lambda (lingua)
                (if (not (equal? lingua current-lingua))
                    (link-to-feed lingua)
                    ""))
              linguas)
        ,(link-to-css "common.css"))
       (body
        (div (@ (id "top-bar"))
             (div (@ (id "name-div"))
                  ,(site-title site))
             (div (@ (id "top-div"))
                  (div (@ (id "linguas-div"))
                       ,(map (lambda (lingua)
                               `(span (@ (class "horizontally-padded"))
                                      ,(if (equal? lingua current-lingua)
                                           lingua
                                           `(a (@ (href
                                                   ,(string-append "/" "index-" lingua ".html")))
                                               ,lingua))))
                             linguas))))
        (div (@ (id "center"))
             (nav (@ (id "side-bar"))
                  ,(if (not is-homepage?)
                       (back-button-for-lingua current-lingua)
                       "")
                  (div (@ (id "link-div"))
                       (ul
                        ,(a-href-sidebar-element
                          "/git/"
                          (_ "Git Projects"))
                        ,(a-href-sidebar-element
                          (string-append "/dont-hang/index-" current-lingua ".html")
                          (_ "Don’t Hang"))
                        ,(a-href-sidebar-element
                          (string-append "/old-stuff-" current-lingua ".html")
                          (_ "Old stuff"))
                        ,(a-href-sidebar-element
                          (string-append "/gui-prog-gtk-2017/index-" current-lingua ".html")
                          (_ "GTK+ Workshop 2017"))
                        ,(a-href-sidebar-element
                          (string-append "/gui-prog-gtk-2016/index-" current-lingua ".html")
                          (_ "GTK+ Workshop 2016"))
                        ,(a-href-sidebar-element
                          (build-url feeds-dir current-lingua "feed.xml")
                          (_ "Subscribe to Atom feed")))))
             (div (@ (id "content"))
                  ,body
                  (footer
                   (div (@ (id "contact"))
                        (h1
                         (@ (class "contact-heading"))
                         ,(_ "Contact me:"))
                        (div
                         ,(_ "Mail:")
                         " "
                         (a (@ (href "mailto:pelzflorian@pelzflorian.de"))
                            "pelzflorian@pelzflorian.de"))
                        (div
                         "XMPP:"
                         " "
                         (a (@ (href "xmpp:pelzflorian@chat.pelzflorian.de?message"))
                            "pelzflorian@chat.pelzflorian.de"))
                        (div
                         ,(_ "GnuPG key:")
                         " "
                         (a (@ (href "/files/key.asc"))
                            "0x4947055B")
                         " ("
                         ,(_ "valid until")
                         " 01/27/2019)"))
                   (div (@ (id "source-code-link"))
                        ,(_ "Find the source code for this website")
                        " "
                        (a (@ (href ,(build-url "git" "pelzfloriande-website")))
                           ,(_ "here"))
                        ".")
                   (div (@ (id "powered-by"))
                        ,(_ "Powered by")
                        " "
                        (a (@ (href "https://www.gnu.org/software/guile/"))
                           "GNU Guile")
                        " "
                        ,(_ "and")
                        " "
                        (a (@ (href "https://haunt.dthompson.us/"))
                           "Haunt")
                        ".")))))))))

(define (pelzflorian-blue-theme current-lingua)
  "Returns the blog’s theme for the lingua."
  (theme #:name "Pelzflorian Blue"
         #:layout
         (pelzflorian-blue-layout current-lingua)
         #:post-template
         (lambda (post)
           `(div
             (h1 ,(post-ref post 'title))
             (h2 ,(date->string-for-lingua (post-date post) current-lingua))
             (div ,(post-sxml post))
             ,(tags-for-post-for-lingua post current-lingua)
             (div (@ (class "vertically-padded"))
                  ,(recent-post-link-for-lingua current-lingua))
             (div (@ (class "vertically-padded"))
                  ,(back-button-for-lingua current-lingua))))
         #:collection-template
         (lambda (site title posts prefix)
           `(div
             (h1 ,(_ "Recent posts"))
             (ol
              ,@(map (lambda (post)
                       `(li
                         (a (@ (href
                                ,(build-url posts-dir
                                            current-lingua
                                            (string-append
                                             (post-slug post)
                                             ".html")))
                               (class "full-width-link"))
                            ,(string-append
                              (post-ref post 'title)
                              " ("
                              (date->string-for-lingua (post-date post) current-lingua)
                              ")"))))
                     (posts/reverse-chronological posts)))
             ,(back-button-for-lingua current-lingua)))))

(define (old-stuff-page-for-lingua lingua)
  (let* ((current-lingua lingua)
         (body
          `(div
            (h1 ,(_ "Lecture notes"))
            (div ,(_ "Some German lecture summaries I made for lectures I heard in 2013:"))
            (ul
             ,(a-href-multi-list-element
               '(("Pdf" . "/uni/fp_zusammenfassung.pdf")
                 ("Tex" . "/uni/fp_zusammenfassung.tex"))
               "Logik")
             ,(a-href-multi-list-element
               '(("Pdf" . "/uni/insy_noticen.pdf")
                 ("Tex" . "/uni/insy_noticen.tex"))
               "Insy"))
            (h1 ,(_ "C exercises (German)"))
            (p ,(_ "Includes a cheat sheet for working with C."))
            (ul
             ,(a-href-list-element
               "/c_exercises.htm"
               (_ "C Exercises")))
            ,(back-button-for-lingua lingua))))
    (lambda (site posts)
      (make-page (string-append "old-stuff" "-" lingua ".html")
                 (with-layout (pelzflorian-blue-theme lingua) site (_ "Old stuff") body)
                 sxml->html))))

(define (dont-hang-page-for-lingua lingua)
  (let ((current-lingua lingua))
    (lambda (site posts)
      (let ((body
             `(div
               (h1 ,(_ "Don’t Hang"))

               (div (@ (class "app-logo"))
                    (img (@ (src "dont-hang.svg")
                            (alt "Don’t Hang logo"))))

               (p ,(_ "A simple GTK+ hangman game inspired by bsd-games’ hangman."))
               (p ,(_ "“Don’t Hang” is a simple hangman game for acquiring and consolidating
a basic vocabulary in a foreign language. It supports loading custom word lists and works with
Unicode and bidirectional text. It also supports pasting characters from the clipboard."))
               (p ,(_ "It is free software and also publicly available at no cost."))

               (h1 ,(_ "Screenshots"))
               (div (@ (class "centered"))
                    ,(screenshot "screenshots/01.png" (_ "Guessing an expression"))
                    ,(screenshot "screenshots/02.png" (_ "Right-to-left support")))

               ,(let* ((posts-about-dont-hang
                        (assoc-ref
                         (posts/group-by-tag posts) "dont-hang")))
                  (if (and posts-about-dont-hang (not (null? posts-about-dont-hang)))
                      (let ((most-recent-post-about-dont-hang
                             (car (posts/reverse-chronological posts-about-dont-hang))))
                        `(div
                          (h1 ,(_ "News"))
                          ,(format-post-for-lingua
                            most-recent-post-about-dont-hang
                            current-lingua)
                          ,(recent-post-link-for-tag-for-lingua
                            "dont-hang"
                            (_ "“Don’t Hang”")
                            current-lingua)))
                      ""))

               (h1 ,(_ "Downloads"))
               (ul
                ,(a-href-list-element
                  "dont-hang-1.1.tar.gz"
                  (_ "“Don’t Hang” version 1.1 Source code."))
                ,(a-href-list-element
                  "/git/dont-hang/"
                  (_ "Current development version."))
                (li (a (@ (href
                           "https://aur.archlinux.org/packages/dont-hang"))
                       ,(_ "“Don’t Hang” for Arch Linux"))
                    ,(_ " and derivative GNU distributions such as ")
                    (a (@ (href
                           "https://www.parabola.nu"))
                       ,(_ "Parabola GNU/Linux-libre"))
                    ".")
                (li
                    ;; (a (@ (href
                    ;;        "binaries/windows/dont-hang-1.1.msi"))
                    ;;    ,(_ "Windows installer (x86)"))
                    ;; ,(_ " as well as ")
                    (a (@ (href
                           "binaries/windows/dont-hang-1.1.zip"))
                       ,(_ "“portable” binaries without installer"))
                    ,(_ " if you are still using Windows, all built using ")
                    (a (@ (href "http://www.msys2.org")) "MSYS2")
                    ,(_ " for which the source files are available at their
home page."))
;;;                 (li ,(_ "Unsigned ")
;;;                     (a (@ (href
;;;                            "binaries/macos/dont-hang-1.1.dmg"))
;;;                        ,(_ "macOS binaries (10.10 Yosemite or newer)"))
;;;                     ,(_ " if you are still using macOS (you may need to follow the instructions
;;; from the macOS error messages on how to make macOS trust the binaries)."))
                )
               (h1 ,(_ "Word lists"))
               (p ,(_ "“Don’t Hang” by default uses the words from the ")
               (span (@ (class "inline-code"))
                     "/usr/share/dict")
               ,(_ " directory, but it can deal with any list of expressions in a text file
with one expression per line. ")
               (a (@ (href
                      "sample-word-lists/english-words.txt"))
                  ,(_ "Here"))
               ,(_ " is an example word list file compiled with words from ")
               (a (@ (href
                      "https://en.wiktionary.org/wiki/Appendix:1000_basic_English_words"))
                  ,(_ "Wiktionary’s list of 1000 basic English words"))
               ,(_ " which you can use if you want simpler words. This sample word list is
available under the terms of ")
               (a (@ (href
                      "sample-word-lists/CCBYSA-3.0-UNPORTED.txt"))
                  ,(_ "the CC-BY-SA 3.0 Unported license"))
               ,(_ ", because Wiktionary uses this license and the words are taken from there."))
               (p ,(_ "Please note that all words in the sample word list have been deliberately
converted to upper case. The reason is that “Don’t Hang” displays words in upper case and storing
the words in lower case would lead to errors in some locales, e.g. the English word “is” would
become “İS” in a Turkish locale."))
               ,(back-button-for-lingua lingua))))
        (make-page (string-append "dont-hang/index" "-" lingua ".html")
                   (with-layout (pelzflorian-blue-theme lingua) site (_ "Don’t Hang") body)
                   sxml->html)))))

;;; GUI Programming in GTK+ Workshop lambdas yielding bodies:

(define (gui-prog-gtk-2016-body-for-lingua lingua)
  (let ((current-lingua lingua)
        (english-links
         `(ul
           ,(a-href-list-element
             "slides-01-en.pdf"
             "Slides 1")
           ,(a-href-list-element
             "slides-02-en.pdf"
             "Slides 2")
           ,(a-href-list-element
             "handout-01-install-en.pdf"
             "Handout 1: Installing")
           ,(a-href-list-element
             "handout-02-hello-gtk-en.pdf"
             "Handout 2: Hello GTK+")
           ,(a-href-list-element
             "handout-03-glade-en.pdf"
             "Handout 3: Glade")
           ,(a-href-list-element
             "handout-04-text-editor-en.pdf"
             "Handout 4: Text Editor")
           ,(a-href-list-element
             "handout-05-hangman-en.pdf"
             "Handout 5: Hangman")
           ,(a-href-list-element
             "handout-06-autotools-en.pdf"
             "Handout 6: Autotools")
           ,(a-href-list-element
             "handout-07-translations-en.pdf"
             "Handout 7: Translations")))
        (german-links
         `(ul
           ,(a-href-list-element
             "slides-01.pdf"
             "Foliensatz 1")
           ,(a-href-list-element
             "slides-02.pdf"
             "Foliensatz 2")
           ,(a-href-list-element
             "handout-01-install.pdf"
             "Handout 1: Installieren")
           ,(a-href-list-element
             "handout-02-hello-gtk.pdf"
             "Handout 2: Hallo GTK+")
           ,(a-href-list-element
             "handout-03-glade.pdf"
             "Handout 3: Glade")
           ,(a-href-list-element
             "handout-04-text-editor.pdf"
             "Handout 4: Texteditor")
           ,(a-href-list-element
             "handout-05-hangman.pdf"
             "Handout 5: Galgenmännchen")
           ,(a-href-list-element
             "handout-06-autotools.pdf"
             "Handout 6: Autotools")
           ,(a-href-list-element
             "handout-07-translations.pdf"
             "Handout 7: Übersetzungen"))))
    `(div
      ,(if (equal? lingua "de")
           `(div
             (p ,german-links)
             (p "English:" ,english-links))
           `(div
             (p ,english-links)
             (p "Deutsch:" ,german-links)))
      (p
       (a (@ (href
              "/git/gui-prog-gtk/tree/?id=f2fb450d34b8fd3b47420315547a61f7f7a6cd71"))
          ,(_ "All source code for the workshop."))))))

(define (gui-prog-gtk-2017-body-for-lingua lingua)
  (let ((current-lingua lingua)
        (english-links
         `(ul
           ,(a-href-list-element
             "slides-01-en.pdf"
             "Slides 1")
           ,(a-href-list-element
             "slides-02-en.pdf"
             "Slides 2")
           ,(a-href-list-element
             "handout-01-install-en.pdf"
             "Handout 1: Installing")
           ,(a-href-list-element
             "handout-02-hello-gtk-en.pdf"
             "Handout 2: Hello GTK+")
           ,(a-href-list-element
             "handout-03-glade-en.pdf"
             "Handout 3: Glade")
           ,(a-href-list-element
             "handout-04-text-editor-en.pdf"
             "Handout 4: Text Editor")
           ,(a-href-list-element
             "handout-05-meson-en.pdf"
             "Handout 5: Meson")
           ,(a-href-list-element
             "handout-06-translations-en.pdf"
             "Handout 6: Translations")))
        (german-links
         `(ul
           ,(a-href-list-element
             "slides-01.pdf"
             "Foliensatz 1")
           ,(a-href-list-element
             "slides-02.pdf"
             "Foliensatz 2")
           ,(a-href-list-element
             "handout-01-install.pdf"
             "Handout 1: Installieren")
           ,(a-href-list-element
             "handout-02-hello-gtk.pdf"
             "Handout 2: Hallo GTK+")
           ,(a-href-list-element
             "handout-03-glade.pdf"
             "Handout 3: Glade")
           ,(a-href-list-element
             "handout-04-text-editor.pdf"
             "Handout 4: Texteditor")
           ,(a-href-list-element
             "handout-05-meson.pdf"
             "Handout 5: Meson")
           ,(a-href-list-element
             "handout-06-translations.pdf"
             "Handout 6: Übersetzungen"))))
    `(div
      ,(if (equal? lingua "de")
           `(div
             (p ,german-links)
             (p "English:" ,english-links))
           `(div
             (p ,english-links)
             (p "Deutsch:" ,german-links)))
      (p
       (a (@ (href
              "/git/gui-prog-gtk/"))
          ,(_ "All source code for the workshop."))))))

(define (gui-prog-gtk-page-for-lingua
         lingua
         gui-prog-gtk-body-for-lingua ; lambda yielding list of download links
         year ; workshop year for HTML title
         poster-url-for-lingua ; for link to poster
         enable-registration) ; whether to show registration link
  (let ((current-lingua lingua))
    (lambda (site posts)
      (let ((body
             `(div
               (p ,(_ "Thank you for your interest in my workshop
“GUI Programming with GTK+”. ")
                  ,(if enable-registration
                       `(span
                         ,(_ "To register please go ")
                         (a (@ (href "/gui-prog-anmelden/"))
                            ,(_ "here"))
                         ". ")
                       `(span))
                  ,(_ "For more information see ")
                  (a (@ (href ,(poster-url-for-lingua lingua)))
                     ,(_ "here"))
                  ".")
               ,(gui-prog-gtk-body-for-lingua current-lingua)
               ,(back-button-for-lingua lingua))))
        (make-page (string-append "gui-prog-gtk-" year "/index" "-" lingua ".html")
                   (with-layout
                    (pelzflorian-blue-theme lingua)
                    site
                    (string-append (_ "GUI Programming with GTK+ ") year)
                    body)
                   sxml->html)))))

(define (homepage-for-lingua lingua)
  (let ((current-lingua lingua))
    (lambda (site posts)
      (let ((most-recent-post
             (if (null? posts)
                 #f
                 (car (posts/reverse-chronological posts)))))
        (make-page (string-append "index" "-" lingua ".html")
                   ((pelzflorian-blue-layout lingua #t) ; #t means “use layout variant for homepage”
                    site
                    (_ "Home page")
                    `(div
                      (div
                       (h1 ,(_ "Welcome"))
                       (p ,(_ "Welcome to my personal web site. My
name is Florian Pelz and I live in Kaiserslautern in Germany. When I
have interesting things to share, I’ll put them up here.")))
                      ,(if (not (null? posts))
                           `(div
                             ,(format-post-for-lingua most-recent-post current-lingua)
                             (div
                              ,(tags-for-post-for-lingua most-recent-post current-lingua)
                              ,(recent-post-link-for-lingua current-lingua)))
                           ""))) ; don’t print any posts if there are no posts yet
                   sxml->html)))))

(define (builders-for-lingua lingua)
  "Returns all the site builders specific to lingua."
  (let* ((current-lingua lingua)
         (posts-relative-dirname
          (string-join (list posts-dir lingua) "/"))
         (feeds-relative-dirname
          (string-join (list feeds-dir lingua) "/"))
         (lingua-filter-regexp
          (make-regexp
           (string-append "^" posts-relative-dirname)))
         (lingua-filter
          (lambda (post)
            (let ((file-path (post-file-name post)))
              (regexp-match?
               (regexp-exec lingua-filter-regexp file-path))))))
    (lambda (site posts)
      (let ((posts-for-lingua (filter lingua-filter posts))
            (blog-for-lingua
             (blog
              #:theme (pelzflorian-blue-theme lingua)
              #:prefix posts-relative-dirname
              #:collections `((,(_ "Recent posts")
                               "index.html"
                               ,posts/reverse-chronological))))
            (atom-feed-for-lingua
             (atom-feed
              #:file-name (string-join (list feeds-relative-dirname "feed.xml") "/")
              #:subtitle (_ "Recent posts")
              #:blog-prefix (string-append "/" posts-relative-dirname)))
            (atom-feeds-by-tag-for-lingua
             (atom-feeds-by-tag
              #:prefix feeds-relative-dirname
              #:blog-prefix (string-append "/" posts-relative-dirname))))
        (flatten ; flatten the resulting list, i.e. no nested elements
         (append ; ensure every argument is a list:
          (list (blog-for-lingua site posts-for-lingua))
          (list (atom-feed-for-lingua site posts-for-lingua))
          (list (atom-feeds-by-tag-for-lingua site posts-for-lingua))
          (list (make-asset "c_exercises.htm" "c_exercises.htm"))
          (list (make-asset "c_exercises.htm" "c_exercises.css"))
          (list ((dont-hang-page-for-lingua lingua) site posts-for-lingua))
          (list ((old-stuff-page-for-lingua lingua) site posts-for-lingua))
          (list ((gui-prog-gtk-page-for-lingua
                  lingua
                  gui-prog-gtk-2016-body-for-lingua
                  "2016"
                  (lambda (lingua) "gui-prog-poster.pdf")
                  #f) ; #f means registration is disabled
                 site
                 posts-for-lingua))
          (list ((gui-prog-gtk-page-for-lingua
                  lingua
                  gui-prog-gtk-2017-body-for-lingua ; gui-prog-gtk-2017-body-for-lingua
                  "2017"
                  (lambda (lingua) (string-append "gui-prog-poster-" lingua ".pdf"))
                  #f)
                 site
                 posts-for-lingua))
          (list ((homepage-for-lingua lingua) site posts-for-lingua))))))))

(site #:title "pelzflorian.de"
      #:domain "pelzflorian.de"
      #:file-filter (make-file-filter
                     (list "^\\." ; no hidden files
                           "^#" ; no emacs temporary files
                           "~$")) ; no auto-saved files
;;;   #:default-metadata
;;;   (list (author . "Florian Pelz")
;;;         (email  . "pelzflorian@pelzflorian.de"))
      #:readers (list sxml-reader)
      #:builders
      (cons*
       (static-directory css-dir)
       (static-directory files-dir)
       (static-directory image-dir)
       (static-directory uni-dir)
       (static-directory "c")
       (static-directory "dont-hang")
       (static-directory "gui-prog-gtk-2016")
       (static-directory "gui-prog-gtk-2017")
       (static-directory "maumau")
       (map ; list of other pages and assets
        (lambda (lingua)
          (builders-for-lingua lingua))
        linguas)))