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;;; The GNU Assembly Web Site
;;; Copyright © 2021 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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/>.

(use-modules (haunt asset)
             (haunt site)
             (haunt page)
             (haunt html)
             (haunt builder assets)
             (haunt reader)
             (haunt reader commonmark)
             (srfi srfi-71))

(define %cwd
  (and=> (assq-ref (current-source-location) 'filename)
         dirname))

(define (base-url . location)
  (string-concatenate (cons "" location)))

(define (image-url location)
  (base-url "/static/images" location))

(define (css-url location)
  (base-url "/static/css" location))

(define* (base-layout body #:key (title "") (meta '())
                      (posts '()) site)
  `((doctype "html")
    (html (@ (lang "en"))
          (head
           (meta (@ (http-equiv "Content-Type")
                    (content "text/html; charset=utf-8")))
           (link (@ (rel "icon")
                    (type "image/x-icon")
                    (href ,(image-url "/favicon.svg"))))
           (link (@ (rel "stylesheet")
                    (href ,(css-url "/main.css"))
                    (type "text/css")
                    (media "screen")))
           (title ,title))
          (body
           (div (@ (id "header")
                   ,@(if (assoc-ref meta 'frontpage)
                         '((class "frontpage"))
                         '()))
                (div (@ (id "header-inner")
                        (class "width-control"))
                     (a (@ (href ,(base-url "/")))
                        (img (@ (class ,(if (assoc-ref meta 'frontpage)
                                            "logo" "logo small"))
                                (src ,(image-url (if (assoc-ref meta 'frontpage)
                                                     "/logo.svg"
                                                     "/logo-small.svg"))))))
                     ,@(if (assoc-ref meta 'frontpage)
                           '((div (@ (class "baseline"))
                                  "Software for human empowerment."))
                           '())))
           (div (@ (id "menubar")
                   (class "width-control"))
                (ul
                 (li (a (@ (href ,(base-url "/")))
                        "About"))
                 (li (a (@ (href ,(base-url "/blog")))
                        "Blog"))
                 (li (a (@ (href ,(base-url "/blog/feed.xml")))
                        (img (@ (alt "Atom feed")
                                (src ,(image-url "/feed.png"))))))))

           (div (@ (id "content")
                   (class "width-control"))
                (div (@ (id "content-inner"))
                     (article ,body)))

           (div (@ (id "footer-box")
                   (class "width-control"))
                (p (a (@ (href "https://wiki.gnu.tools/git/")) ;FIXME
                      "Source of this site")))))))

(define read-markdown
  (reader-proc commonmark-reader))

(define (read-markdown-page file posts site)
  "Read the CommonMark page from FILE.  Return its final SXML
representation."
  (let ((meta body (read-markdown (string-append %cwd "/" file))))
    (base-layout `(div (@ (class "post"))
                       (div (@ (class "post-body")) ,body))
                 #:title (string-append "The GNU Assembly — "
                                        (assoc-ref meta 'title))
                 #:meta meta
                 #:posts posts
                 #:site site)))

(define (static-pages)
  "Return the list of static web pages."
  (define (markdown-page html md)
    (lambda (site posts)
      (make-page html (read-markdown-page md posts site)
                 sxml->html)))

  (list (markdown-page "index.html" "index.md")
        (markdown-page "/en/documents/social-contract/index.html"
                       "social-contract.md")))


(site #:title "The GNU Assembly"
      #:domain "gnu.tools"
      #:default-metadata
      '((author . "The GNU Assembly")
        (email  . "assembly@lists.gnu.tools"))
      #:readers (list commonmark-reader)
      #:builders (cons (static-directory "static")
                       (static-pages)))