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(define-module (theme)
  #:use-module (haunt html)
  #:use-module (haunt site)
  #:use-module (haunt post)
  #:use-module (haunt builder blog)
  #:use-module (sxml xpath)
  #:export (hwebs-theme-blog
            hwebs-theme-now
            flat-page-template))

(define layout
  (lambda (site title body)
    `((doctype "html")
      (html
       (head
        (meta (@ (http-equiv "Content-Type")
                 (content "text/html")
                 (charset "utf-8")))
        (meta (@ (name "viewport")
                 (content "width=device-width, initial-scale=1.0")))
        (link (@ (rel "stylesheet")
                 (type "text/css")
                 (href "/style.css")))
        (title ,(string-append title " — " (site-title site))))
       (body
        (header (span ,(assq-ref (site-default-metadata site) 'author))
                (nav (ul (li (a (@ (href "/")) "Home"))
                         (li (a (@ (href "/now")) "Now"))
                         (li (a (@ (href "/blog")) "Blog")))))
        (main
         (article (h1 ,title)
                  ,body)))))))


(define hwebs-theme-blog
  (theme #:name "hwebs"
         #:layout layout
         #:post-template
         (lambda (post)
           ;; TODO fill in datetime correctly
           ;; TODO add <author>? (as hidden?)
           `((time ,(date->string*(post-date post)))
             ,(post-sxml post)))
         #:collection-template
         (lambda (site title posts prefix)
           (define (post-uri post)
             (string-append "/" (or prefix "") "/"
                            (site-post-slug site post) ".html"))
           `((ul
              ,@(map (lambda (post)
                       `(li (a (@ (href ,(post-uri post)))
                               ,(post-ref post 'title)
                               " — "
                               ,(date->string* (post-date post)))))
                     posts))))))

(define hwebs-theme-now
  (theme #:name "hwebs-now"
         #:layout layout
         #:post-template
         (lambda (post)
           ;; TODO fill in datetime correctly
           ;; TODO add <author>? (as hidden?)
           `((time ,(date->string*(post-date post)))
             ,(post-sxml post)))
         #:collection-template
         (lambda (site title posts prefix)
           (define (post-uri post)
             (string-append "/" (or prefix "") "/"
                            (site-post-slug site post) ".html"))
           (define (post-entries post)
             ((sxpath '(rss channel item title *text*)) (post-sxml post)))

           `(,@(map (lambda (post)
                      `(section (h2 ,(post-ref post 'title))
                                ;; TODO only show "See more" if there are more entries than max
                                ;; + maybe put it at bottom
                                (a (@ (href ,(post-uri post))) "See more.")
                                (ul
                                 ,@(map (lambda (entry-title)
                                          `(li ,entry-title))
                                        ;; TODO do this better
                                        (list-head (post-entries post) (min 5 (length (post-entries post))))))))
                    posts)))))

(define (flat-page-template site metadata body)
  ((theme-layout hwebs-theme-blog) site (assq-ref metadata 'title) body))