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+;;; wikme --- build a static wiki out of a folder of markdown files
+
+(import (cmark)
+        (srfi-152)
+        (utf8)
+        (chicken irregex)
+        (chicken port)
+        (chicken string))
+
+
+;;; Configuration
+
+(define site-config
+  (make-parameter `((base-url . "https://www.example.com")
+                    ;; These default directories aren't .. great.
+                    (source-dir . "src")
+                    (output-dir . "out")
+                    (transformers . ,(list commonmark->html
+                                           wikify-links))
+                    (filename-transform
+                     . (lambda (fname)
+                         (md->index-html fname)))
+                    (page-environment
+                     . ((title
+                         . ,(lambda (page)
+                              (cdr (assq 'title (page-meta page)))))
+                        (body
+                         . ,(lambda (page)
+                              (page-body page)))
+                        (last_updated
+                         . ,(lambda (page)
+                              (cdr (assq 'last-updated (page-meta page))))))))))
+
+(define (config-get x)
+  (if (assq x (site-config))
+      (cdr (assq x (site-config)))
+      #f))
+
+
+;;; Templates
+
+(define (render template env)
+  ;;; Render TEMPLATE using ENV.
+  ;; TEMPLATE is a string with {{placeholders}}; ENV is an alist of key-value
+  ;; pairs to insert into the TEMPLATE's placeholders.
+  (string-substitute* template (env->replacements env)))
+
+(define (env->replacements env)
+  ;;; Convert an ENV alist of the form `((X . Y) ...) to '(("{{X}}" . "Y") ...).
+  ;; X's are template variables and Y's are the values of those variables.  In
+  ;; the template, both "{{X}}" and "{{ X }}" will be replaced.
+  ;; If Y is a thunk, call it.
+  (let loop ((env env)
+             (res '()))
+    (if (null? env)
+        res
+        (let* ((this (car env))
+               (rest (cdr env))
+               (key (->string (car this)))
+               (val (if (procedure? (cdr this))
+                        ((cdr this))
+                        (->string (cdr this)))))
+          (loop (cdr env)
+                (append (list (cons (string-append "{{" key "}}") val)
+                              (cons (string-append "{{ " key " }}") val))
+                        env))))))
+
+
+;;; Wiki links
+
+(define wiki-link-sre
+  ;;; An SRE for [[wiki-style links|with optional titles]].
+  '(: "[["
+      (submatch-named page (+ (~ "|")))
+      (? (submatch "|" (submatch-named title (*? nonl))))
+      "]]"))
+
+(define (wikify-links text)
+  ;;; Convert [[Wiki-style links]] to HTML style in TEXT.
+  (irregex-replace/all wiki-link-sre text
+                       (lambda (m)
+                         (let* ((page (irregex-match-substring m 'page))
+                                (title (or (irregex-match-substring m 'title)
+                                           page)))
+                           (string-append
+                            "<a href=\"" (linkify page) "\">" title "</a>")))))
+
+(define (linkify pagename)
+  ;;; Turn a page name into a link suitable for an <a> tag.
+  (string-append (base-url) "/" (slugify pagename) "/index.html"))
+
+(define (string-capitalize str)
+  ;;; Capitalize the first word in STR, and ensure the rest of it is lowercase.
+  ;; Stolen and adapted from MIT/GNU Scheme
+  (let* ((end (string-length str))
+         (str* (make-string end)))
+    (do ((i 0 (+ i 1)))
+        ((= i end))
+      (string-set! str* i ((if (= i 0) char-upcase char-downcase)
+                           (string-ref str i))))
+    str*))
+
+(define (slugify str)
+  ;;;  Convert STR to a 'slug', that is, another string suitable for linking.
+  ;; This function will return the input string, in sentence case, and with all
+  ;; punctuation and spaces converted to a hypen.
+  (string-capitalize
+   (string-trim-both (irregex-replace/all '(+ (~ alnum)) str "-")
+                     (lambda (c)
+                       (char=? c #\-)))))
+
+(define (unslugify slug)
+  ;;; Convert a SLUG back into a normal string as best as possible.
+  ;; Because information is lost in slugification, it's impossible to be sure
+  ;; that the result of this procedure is totally accurate.  That is,
+  ;; slugification is not round-trippable.
+  (irregex-replace/all '("-") slug " "))
+
+
+;;; Transform source
+
+(define (transform source . transformers)
+  ;;; Transform SOURCE to html by passing it through a series of TRANSFORMERS.
+  ;; Each TRANSFORMER should be a one-argument procedure taking and returning a
+  ;; string.
+  (let loop ((transformers transformers)
+             (output source))
+    (if (null? transformers)
+        output
+        (loop (cdr transformers)
+              ((car transformers) output)))))
+
+(define (md->index-html filename)
+  ;;; Transform a FILENAME of the form dir/name.md to dir/name/index.html.
+  ;; Uses source
+  )
+
+
+;;; Pages
+
+(define-record-type <page>
+  ;;; A wiki page is a mapping between source and body content, and between the
+  ;;; page's origin and its destination files, wrapped together with some
+  ;;; metadata.
+  (make-page source body origin destination meta)
+  page?
+  (source page-source                   ; source markup
+          (setter page-source))
+  (body page-body                       ; rendered page body
+        (setter page-source))
+  (origin page-origin                   ; file containing the markup
+          (setter page-origin))
+  (destination page-destination         ; destination file
+               (setter page-destination))
+  (meta page-meta                       ; alist of metadata tags
+        (setter page-meta)))
+
+(define (page-meta-ref key page)
+  ;;; Get metadata KEY from PAGE.
+  (cdr (assq key (page-meta page))))
+
+(define (file->page file
+                    #!key
+                    (transformers (config-get 'transformers))
+                    (destination ))
+  ;;; Create a <page> from FILE.
+  ;; Wraps make-page for easier use.
+
+  )
+
+
+;;; Writing files
+
+(define (publish file config)
+  ;;; Publish FILE, using CONFIG.
+  ;; CONFIG should be a configuration alist, which see above.
+  #f)