gnu: Move asciidoc and doxygen to new module.

* gnu/packages/asciidoc.scm (asciidoc): Move this...
* gnu/packages/doxygen.scm (doxygen): ...and this...
* gnu/packages/documentation.scm: ...to here.  New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add accordingly.

gnu/packages/documentation.scm

@@ -0,0 +1,89 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2014, 2016 Andreas Enge <andreas@enge.fr>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix 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.
+;;;
+;;; GNU Guix 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages documentation)
+  #:use-module (guix licenses)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix build-system cmake)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages python)
+  #:use-module (gnu packages bison)
+  #:use-module (gnu packages flex)
+  #:use-module (gnu packages graphviz)
+  #:use-module (gnu packages perl)
+  #:use-module (gnu packages xml)
+  #:autoload   (gnu packages zip) (unzip))
+
+(define-public asciidoc
+  (package
+    (name "asciidoc")
+    (version "8.6.9")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://sourceforge/asciidoc/asciidoc-"
+                                  version ".tar.gz"))
+              (sha256
+               (base32
+                "1w71nk527lq504njmaf0vzr93pgahkgzzxzglrq6bay8cw2rvnvq"))))
+    (build-system gnu-build-system)
+    (arguments '(#:tests? #f))                    ; no 'check' target
+    (inputs `(("python" ,python-2)))
+    (home-page "http://www.methods.co.nz/asciidoc/")
+    (synopsis "Text-based document generation system")
+    (description
+     "AsciiDoc is a text document format for writing notes, documentation,
+articles, books, ebooks, slideshows, web pages, man pages and blogs.
+AsciiDoc files can be translated to many formats including HTML, PDF,
+EPUB, man page.
+
+AsciiDoc is highly configurable: both the AsciiDoc source file syntax and
+the backend output markups (which can be almost any type of SGML/XML
+markup) can be customized and extended by the user.")
+    (license gpl2+)))
+
+(define-public doxygen
+  (package
+    (name "doxygen")
+    (version "1.8.11")
+    (source (origin
+             (method url-fetch)
+             (uri (string-append "http://ftp.stack.nl/pub/users/dimitri/"
+                                 name "-" version ".src.tar.gz"))
+             (sha256
+              (base32
+               "0ja02pm3fpfhc5dkry00kq8mn141cqvdqqpmms373ncbwi38pl35"))
+             (patches (search-patches "doxygen-test.patch"))))
+    (build-system cmake-build-system)
+    (native-inputs
+     `(("bison" ,bison)
+       ("flex" ,flex)
+       ("libxml2" ,libxml2) ; provides xmllint for the tests
+       ("python" ,python-2))) ; for creating the documentation
+    (arguments
+     `(#:test-target "tests"))
+    (home-page "http://www.stack.nl/~dimitri/doxygen/")
+    (synopsis "Generate documentation from annotated sources")
+    (description "Doxygen is the de facto standard tool for generating
+documentation from annotated C++ sources, but it also supports other popular
+programming languages such as C, Objective-C, C#, PHP, Java, Python,
+IDL (Corba, Microsoft, and UNO/OpenOffice flavors), Fortran, VHDL, Tcl,
+and to some extent D.")
+    (license gpl3+)))