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+;;; Copyright © 2019 - 2020 Jakob L. Kreuze <zerodaysfordays@sdf.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/>.
+
+(define-module (jakob builder htaccess)
+  #:use-module (haunt artifact)
+  #:use-module (ice-9 match)
+  #:export (htaccess))
+
+;; Good resource:
+;; <https://perishablepress.com/stupid-htaccess-tricks/#ess4>
+
+(define* (htaccess-writer contents #:optional (port (current-output-port)))
+  (display (string-join contents "\n") port)
+  (newline port))
+
+(define* (htaccess #:key
+                   (error-documents '())
+                   (redirects '()))
+  "Create an .htaccess file at the site's root.
+
+ERROR-DOCUMENTS specifies the file name of the page to display for a specific
+HTTP error code: a list of (error-code . file-name) pairs.
+
+REDIRECTS specifies file names to show for certain requests: a list of (pattern
+. file-name) pairs."
+  (define contents
+    `(,@(map (match-lambda
+               ((code . file-name)
+                (format #f "ErrorDocument ~a ~a" code file-name)))
+             error-documents)
+      ,@(map (match-lambda
+               ((pattern . file-name)
+                (format #f "RewriteRule ~a ~a" pattern file-name)))
+             redirects)))
+
+  (lambda (site posts)
+    (serialized-artifact ".htaccess" contents htaccess-writer)))