reader: Add texinfo support.

* haunt/reader/texinfo.scm: New file.
* Makefile.am (SOURCES): Add it.
* example/haunt.scm: Activate texinfo reader.
* example/posts/quux.scm: New file.

Makefile.am

@@ -46,7 +46,6 @@ SOURCES =					\
   haunt/config.scm				\
   haunt/utils.scm				\
   haunt/post.scm				\
-  haunt/reader.scm				\
   haunt/page.scm				\
   haunt/asset.scm				\
   haunt/site.scm				\
@@ -54,6 +53,8 @@ SOURCES =					\
   haunt/builder/assets.scm			\
   haunt/builder/atom.scm			\
   haunt/builder/blog.scm			\
+  haunt/reader.scm				\
+  haunt/reader/texinfo.scm			\
   haunt/ui.scm					\
   haunt/ui/build.scm				\
   haunt/ui/serve.scm				\

example/haunt.scm

@@ -4,6 +4,7 @@
              (haunt builder assets)
              (haunt reader)
              (haunt reader skribe)
+             (haunt reader texinfo)
              (haunt site))
 
 (site #:title "Built with Guile"
@@ -11,7 +12,7 @@
       #:default-metadata
       '((author . "Eva Luator")
         (email  . "eva@example.com"))
-      #:readers (list skribe-reader sxml-reader html-reader)
+      #:readers (list texinfo-reader skribe-reader sxml-reader html-reader)
       #:builders (list (blog)
                        (atom-feed)
                        (atom-feeds-by-tag)

example/posts/quux.texi

@@ -0,0 +1,32 @@
+title: Hello, Texi!
+date: 2015-10-15 22:00
+tags: foo, bar
+---
+
+This is a test of the @emph{texinfo} reader for Haunt.  I sure hope it
+works well.  Here is a URL to the @url{http://haunt.dthompson.us,
+Haunt home page}.
+
+@example
+(use-modules (haunt asset)
+             (haunt builder blog)
+             (haunt builder atom)
+             (haunt builder assets)
+             (haunt reader)
+             (haunt reader skribe)
+             (haunt reader texinfo)
+             (haunt site))
+
+(site #:title "Built with Guile"
+      #:domain "example.com"
+      #:default-metadata
+      '((author . "Eva Luator")
+        (email  . "eva@@example.com"))
+      #:readers (list texinfo-reader skribe-reader sxml-reader html-reader)
+      #:builders (list (blog)
+                       (atom-feed)
+                       (atom-feeds-by-tag)
+                       (static-directory "images")))
+@end example
+
+This is another paragraph.

haunt/reader/texinfo.scm

@@ -0,0 +1,44 @@
+;;; 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:
+;;
+;; Texinfo post reader.
+;;
+;;; Code:
+
+(define-module (haunt reader texinfo)
+  #:use-module (texinfo)
+  #:use-module (texinfo html)
+  #:use-module (haunt post)
+  #:use-module (haunt reader)
+  #:use-module (haunt utils)
+  #:export (texinfo-reader))
+
+(use-modules (srfi srfi-19))
+
+(define texi->shtml
+  (compose stexi->shtml texi-fragment->stexi))
+
+(define texinfo-reader
+  (make-reader (make-file-extension-matcher "texi")
+               (lambda (file)
+                 (call-with-input-file file
+                   (lambda (port)
+                     (values (read-metadata-headers port)
+                             (texi->shtml port)))))))