Add page module.

* haunt/page.scm: New file.
* Makefile.am (SOURCES): Add it.

Makefile.am

@@ -43,6 +43,7 @@ SOURCES =					\
   haunt/config.scm				\
   haunt/post.scm				\
   haunt/reader.scm				\
+  haunt/page.scm				\
   haunt/ui.scm					\
   haunt/ui/serve.scm				\
   haunt/serve/mime-types.scm			\

haunt/page.scm

@@ -0,0 +1,49 @@
+;;; Haunt --- Static site generator for GNU Guile
+;;; Copyright © 2015 David Thompson <davet@gnu.org>
+;;;
+;;; This file is part of Haunt.
+;;;
+;;; Haunt 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.
+;;;
+;;; Haunt 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 Haunt.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Page data type.
+;;
+;;; Code:
+
+(define-module (haunt page)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-9)
+  #:use-module (srfi srfi-26)
+  #:use-module (haunt build html)
+  #:export (make-page
+            page?
+            page-file-name
+            page-contents
+            page-writer
+            write-page))
+
+(define-record-type <page>
+  (make-page file-name sxml writer)
+  page?
+  (file-name page-file-name)
+  (sxml page-sxml)
+  (writer page-writer))
+
+(define (write-page page output-directory)
+  "Write PAGE to OUTPUT-DIRECTORY."
+  (match page
+    (($ <page> file-name sxml writer)
+     (let ((output (string-append output-directory "/" file-name)))
+       (call-with-output-file output (cut writer sxml <>))))))