[babl] Build Vala support (.vapi file) by default

[Jon Nordby <jonnor src gnome org>]

commit dc292138a3d2817a2086d5ea2847ad8ea4c62271
Author: Jon Nordby <jononor gmail com>
Date:   Wed Aug 3 23:13:29 2011 +0200

    Build Vala support (.vapi file) by default
    
    Generated from .gir file.

 babl/.gitignore  |    1 +
 babl/Makefile.am |    8 ++++++++
 configure.ac     |   21 +++++++++++++++++++++
 3 files changed, 30 insertions(+), 0 deletions(-)
---
diff --git a/babl/.gitignore b/babl/.gitignore
index c7aeff3..42ebfdb 100644
--- a/babl/.gitignore
+++ b/babl/.gitignore
@@ -4,6 +4,7 @@
 /.libs
 /Babl-0.1.gir
 /Babl-0.1.typelib
+/*.vapi
 /Makefile
 /Makefile.in
 /babl-version.h
diff --git a/babl/Makefile.am b/babl/Makefile.am
index e526e8a..8b48f10 100644
--- a/babl/Makefile.am
+++ b/babl/Makefile.am
@@ -121,5 +121,13 @@ CLEANFILES = $(gir_DATA) $(typelibs_DATA)
         $(G_IR_COMPILER_OPTS) \
         $< -o $@
 
+if HAVE_VALA
+babl-$(BABL_API_VERSION).vapi: Babl-$(BABL_API_VERSION).gir
+	$(VAPIGEN) --library=babl-$(BABL_API_VERSION) Babl-$(BABL_API_VERSION).gir
+
+vapidir= vapidir@
+vapi_DATA = babl-$(BABL_API_VERSION).vapi
+
+endif # HAVE_VALA
 
 endif # HAVE_INTROSPECTION
diff --git a/configure.ac b/configure.ac
index 0c6c392..126b5e4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -67,6 +67,27 @@ AC_SUBST(BABL_RELEASE)
 # GObject Introspection
 GOBJECT_INTROSPECTION_CHECK([0.6.8])
 
+# Vala
+AC_ARG_WITH(vala, [  --without-vala         build without Vala support])
+
+have_vapigen="no"
+if test "x$with_vala" != "xno"; then
+
+  AC_PATH_PROG(VAPIGEN, vapigen, no)
+  if test "$VAPIGEN" = "no"; then
+    have_vapigen="no  (vapigen executable not found)"
+    AC_MSG_RESULT([*** Check for vapigen failed.])
+  else
+    have_vapigen="yes"
+  fi
+fi
+
+have_vala=$have_vapigen
+AM_CONDITIONAL(HAVE_VALA, test "$have_vala" = "yes")
+
+vapidir=$(pkg-config --variable vapidir vala-1.0)
+AC_SUBST(vapidir)
+
 dnl The symbol BABL_UNSTABLE is defined above for substitution in
 dnl Makefiles and conditionally defined here as a preprocessor symbol
 dnl and automake conditional.