wayland: Add wayland client

This patch adds a new client which supports the Wayland input method
protocol.  Note that the support is disabled by default until the
input method protocol becomes official in the Wayland upstream.
Supply --enable-wayland to configure to try it.  Also, you will need
to set the executable path of ibus-wayland under the "input-method"
section of weston.ini, like this:

 [input-method]
 path=.../libexec/ibus-wayland

BUG=Issue#1617

Review URL: https://codereview.appspot.com/11320043
Patch from Jan Arne Petersen <jan.petersen@kdab.com>.

client/Makefile.am

@@ -32,10 +32,15 @@ if ENABLE_XIM
 X11 = x11
 endif
 
+if ENABLE_WAYLAND
+WAYLAND = wayland
+endif
+
 SUBDIRS = \
 	$(GTK2) \
 	$(GTK3) \
 	$(X11) \
+	$(WAYLAND) \
 	$(NULL)
 
 -include $(top_srcdir)/git.mk

client/wayland/Makefile.am

@@ -0,0 +1,62 @@
+# vim:set noet ts=4:
+#
+# ibus - The Input Bus
+#
+# Copyright (c) 2007-2013 Peng Huang <shawn.p.huang@gmail.com>
+# Copyright (c) 2007-2013 Red Hat, Inc.
+#
+# This library 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.
+#
+# This library 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 library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301 USA.
+
+libibus = $(top_builddir)/src/libibus-@IBUS_API_VERSION@.la
+
+libexec_PROGRAMS = ibus-wayland
+
+protocol_sources = \
+	input-method-protocol.c \
+	input-method-client-protocol.h \
+	$(NULL)
+
+ibus_wayland_SOURCES = \
+	$(protocol_sources) \
+	main.c \
+	$(NULL)
+
+ibus_wayland_DEPENDENCIES = \
+	$(libibus) \
+	$(NULL)
+
+ibus_wayland_LDADD = \
+	$(libibus) \
+	$(GIO2_LIBS) \
+	$(WAYLAND_LIBS) \
+	$(NULL)
+
+ibus_wayland_CFLAGS = \
+	$(GIO2_CFLAGS) \
+	$(WAYLAND_CFLAGS) \
+	-I$(top_srcdir)/src \
+	-I$(top_builddir)/src \
+	$(NULL)
+
+$(libibus):
+	(cd $(top_builddir)/src; make)
+
+EXTRA_DIST = \
+	README \
+	$(protocol_sources) \
+	$(NULL)
+
+-include $(top_srcdir)/git.mk

client/wayland/README

@@ -0,0 +1,17 @@
+The following two files are generated with wayland-scanner:
+
+input-method-protocol.c
+input-method-client-protocol.h
+
+We include them in the distribution instead of generating them, since
+the Wayland protocol structure will unlikely change.  Do not modify
+those files manually.
+
+To generate them, use the wayland-scanner command as follows.  You can
+find input-method.xml in the Weston source code (maybe it will be
+moved to the Wayland source code later).
+
+$ wayland-scanner code < input-method.xml \
+  > input-method-protocol.c
+$ wayland-scanner client-header < input-method.xml \
+  > input-method-client-protocol.h