[gsettings-desktop-schemas/wip/carlosg/issue-6] meson: Generate and install org.gnome.desktop.enums.xml file

[Carlos Garnacho <carlosg src gnome org>]

commit 77d1327e97c65bb7e17d022e984f9c8e6fe80fc8
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Jan 11 14:18:01 2019 +0100

    meson: Generate and install org.gnome.desktop.enums.xml file
    
    We were failing to generate it on meson. Avoid gnome.mkenums() since it
    becomes rather awkward to use (optimized for c/h files output). Probably
    worth revisiting if https://github.com/mesonbuild/meson/issues/1687 gets
    better.
    
    https://gitlab.gnome.org/GNOME/gsettings-desktop-schemas/issues/6

 headers/meson.build | 14 ++++++++++++++
 meson.build         |  2 ++
 2 files changed, 16 insertions(+)
---
diff --git a/headers/meson.build b/headers/meson.build
index f80f2bb..f3dce56 100644
--- a/headers/meson.build
+++ b/headers/meson.build
@@ -4,6 +4,20 @@ headers = files(
 
 install_headers(headers, subdir: gsettings_desktop_schemas_name)
 
+enums_xml = custom_target('org.gnome.desktop.enums.xml',
+    input: headers,
+    output: 'org.gnome.desktop.enums.xml',
+    command: [glib_mkenums,
+              '--comments', '<!-- @comment@ -->',
+              '--fhead', '<schemalist>',
+              '--vhead', '<@type@ id="org.gnome.desktop.@EnumName@">',
+              '--vprod', '    <value nick="@valuenick@" value="@valuenum@"/>',
+              '--vtail', '  </@type@>',
+              '--ftail', '</schemalist>', '@INPUT@'],
+    capture: true,
+    install: true,
+    install_dir: schemasdir)
+
 if not meson.is_cross_build() and get_option('introspection')
   noinst_lib = shared_library('noinst',
                               headers,
diff --git a/meson.build b/meson.build
index 057c569..cc577b4 100644
--- a/meson.build
+++ b/meson.build
@@ -37,6 +37,8 @@ pkg.generate(name: gsettings_desktop_schemas_name,
              version: gsettings_desktop_schemas_version,
              description: 'Shared GSettings schemas for the desktop, including helper headers')
 
+glib_mkenums = find_program('glib-mkenums')
+
 subdir('headers')
 subdir('schemas')
 subdir('po')