[babl/wip/nielsdg/generate-vapi] meson: Generate VAPI file

[Niels De Graef <nielsdg src gnome org>]

commit 659031e6e869ce11aec35ea3a9272abc06c63cb3
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Mon Aug 12 06:58:56 2019 +0200

    meson: Generate VAPI file
    
    This can be used to call Babl from Vala. This is also very useful when
    we want to do the same thing (calling from vala) for GIMP 3.x

 babl/meson.build  | 7 +++++++
 meson_options.txt | 1 +
 2 files changed, 8 insertions(+)
---
diff --git a/babl/meson.build b/babl/meson.build
index b551c9a8d..53824cac7 100644
--- a/babl/meson.build
+++ b/babl/meson.build
@@ -150,4 +150,11 @@ if get_option('enable-gir')
     header: 'babl.h',
     install: true,
   )
+
+  if get_option('enable-vapi')
+    gnome.generate_vapi(lib_name,
+      sources: babl_gir[0],
+      install: true,
+    )
+  endif
 endif
diff --git a/meson_options.txt b/meson_options.txt
index eca27beb6..639192786 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -6,5 +6,6 @@ option('enable-sse4_1', type: 'boolean', value: true, description: 'enable SSE4.
 option('enable-avx2',   type: 'boolean', value: true, description: 'enable AVX2 support')
 option('enable-f16c',   type: 'boolean', value: true, description: 'enable hardware half-float support')
 option('enable-gir',    type: 'boolean', value: true, description: 'enable GObject-Introspection (GIR)')
+option('enable-vapi',   type: 'boolean', value: true, description: 'enable Vala .vapi generation (requires 
GIR)')
 option('with-docs',     type: 'boolean', value: true, description: 'build website')
 option('with-lcms',     type: 'boolean', value: true, description: 'build with lcms')