[babl/wip/nielsdg/gir: 1/4] Add GObject Introspection support to babl

[Niels De Graef <nielsdg src gnome org>]

commit f2c279f825980ef6014726ef4b63077a74b97fcc
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Mon Aug 5 18:55:38 2019 +0200

    Add GObject Introspection support to babl
    
    This is needed for GIMP to also have proper GIR support for its plugins.
    
    Extra thanks go to Emmanuele Bassi for the identity filter.

 babl/identfilter.py | 37 +++++++++++++++++++++++++++++++++++++
 babl/meson.build    | 18 ++++++++++++++++++
 meson.build         |  1 +
 meson_options.txt   |  1 +
 4 files changed, 57 insertions(+)
---
diff --git a/babl/identfilter.py b/babl/identfilter.py
new file mode 100644
index 0000000..e592de4
--- /dev/null
+++ b/babl/identfilter.py
@@ -0,0 +1,37 @@
+# Copyright 2014  Emmanuele Bassi
+#
+# SPDX-License-Identifier: MIT
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import sys
+import re
+
+def rename_babl_object(text):
+    # We need this to rename the Babl type into BablObject
+    # Otherwise the type clashes with the namespace
+    if text == 'Babl':
+        return 'BablObject'
+
+    # Leave the rest unharmed
+    return text
+
+if __name__ == '__main__':
+    in_text = sys.stdin.read()
+    sys.stdout.write(rename_babl_object(in_text))
diff --git a/babl/meson.build b/babl/meson.build
index c57bc93..3d86860 100644
--- a/babl/meson.build
+++ b/babl/meson.build
@@ -133,3 +133,21 @@ babl = library(
   version: so_version,
   install: true,
 )
+
+if get_option('enable-gir')
+  # identity filter, so GIR doesn't choke on the Babl type
+  # (since it has the same name as the Babl namespace)
+  identfilter_py = join_paths(meson.current_source_dir(), 'identfilter.py')
+
+  babl_gir = gnome.generate_gir(babl,
+    sources: babl_headers,
+    extra_args: [
+      '--identifier-filter-cmd=@0@ @1@'.format(python.path(), identfilter_py),
+      '-DBABL_IS_BEING_COMPILED',
+    ],
+    namespace: 'Babl',
+    nsversion: '1',
+    header: 'babl.h',
+    install: true,
+  )
+endif
diff --git a/meson.build b/meson.build
index 887e288..3cbd780 100644
--- a/meson.build
+++ b/meson.build
@@ -26,6 +26,7 @@ conf = configuration_data()
 pkgconfig = import('pkgconfig')
 i18n      = import('i18n')
 gnome     = import('gnome')
+python    = import('python')
 
 cc        = meson.get_compiler('c')
 prefix    = get_option('prefix')
diff --git a/meson_options.txt b/meson_options.txt
index f4a7ced..eca27be 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -5,5 +5,6 @@ option('enable-sse3',   type: 'boolean', value: true, description: 'enable SSE3
 option('enable-sse4_1', type: 'boolean', value: true, description: 'enable SSE4.1 support')
 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('with-docs',     type: 'boolean', value: true, description: 'build website')
 option('with-lcms',     type: 'boolean', value: true, description: 'build with lcms')