Qt: Add doc generation with doxygen

* configure.ac: Look for doxygen if qt is built.
 Configure new files.
* lang/qt/doc/Doxyfile.in: New.
* lang/qt/doc/Makefile.am: New.
* lang/qt/README: Update.

--
Currently this is a standard doxyfile template without much
customization.

configure.ac

@@ -286,6 +286,14 @@ if test "$found" = "1"; then
    *** Qt5 (Qt5Core) is required for qt binding.
    ***]])
    fi
+
+   AC_CHECK_PROGS([DOXYGEN], [doxygen])
+   if test -z "$DOXYGEN";
+       then AC_MSG_WARN([Doxygen not found - Qt binding doc will not be built.])
+   fi
+   AM_CONDITIONAL([HAVE_DOXYGEN],
+                  [test -n "$DOXYGEN"])
+
    # Make sure that qt comes after cpp
    enabled_languages=`echo $enabled_languages | sed 's/qt//'`
    enabled_languages=`echo $enabled_languages qt`
@@ -686,6 +694,8 @@ AC_CONFIG_FILES(lang/qt/src/QGpgmeConfig.cmake.in)
 AC_CONFIG_FILES(lang/qt/src/QGpgmeConfigVersion.cmake)
 AC_CONFIG_FILES(lang/qt/tests/Makefile)
 AC_CONFIG_FILES([lang/Makefile lang/cl/Makefile lang/cl/gpgme.asd])
+AM_COND_IF([HAVE_DOXYGEN], [AC_CONFIG_FILES([lang/qt/doc/Doxyfile])])
+AC_CONFIG_FILES(lang/qt/doc/Makefile)
 AC_OUTPUT
 
 echo "

lang/qt/Makefile.am

@@ -18,6 +18,6 @@
 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 # 02111-1307, USA
 
-SUBDIRS = src tests
+SUBDIRS = src tests doc
 
 EXTRA_DIST = README

lang/qt/README

@@ -1,6 +1,6 @@
 Qt API bindings/wrapper for gpgme
 ----------------------------------------
-Based on KF5gpgmepp QGpgme
+Based on KF5gpgmepp QGpgme and libkleo/backends/qgpgme
 
 QGpgme is free software; you can redistribute it and/or
 modify it under the terms of the GNU Library General Public
@@ -21,7 +21,4 @@ Overview
 --------
 QGpgme provides Qt API bindings around Gpgmepp. It depends on Gpgmepp.
 
-Currently this is a very thin library that only provides a QByteArray
+See the generated documentation for more info
-and QIODevice dataprovider. But might be extended in the future with
-code that is currently part of KDE's libkleopatra. To provide an easy
-to use API for Qt Applications.

lang/qt/doc/Makefile.am

@@ -0,0 +1,31 @@
+# Makefile.am - Makefile for GPGME Qt docs.
+# Copyright (C) 2016 Intevation GmbH
+#
+# This file is part of GPGME.
+#
+# GPGME is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 2.1 of the
+# License, or (at your option) any later version.
+#
+# GPGME 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 Lesser General
+# Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, see <http://www.gnu.org/licenses/>.
+
+## Process this file with automake to produce Makefile.in
+
+if HAVE_DOXYGEN
+doxyfile.stamp:
+	$(DOXYGEN) Doxyfile
+	touch doxyfile.stamp
+
+CLEANFILES = doxyfile.stamp
+
+all-local: doxyfile.stamp
+clean-local:
+	rm -rf $(abs_builddir)/generated
+endif