[vte/ricotz/vala] vala: Support building bindings for vte-2.91-gtk4

[Rico Tzschichholz <ricotz src gnome org>]

commit 649fc842327e114cb4b0884266dff82b00f8dfa5
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sat Mar 5 08:49:17 2022 +0100

    vala: Support building bindings for vte-2.91-gtk4
    
    Fixes https://gitlab.gnome.org/GNOME/vte/-/issues/2546

 bindings/meson.build      |  2 +-
 bindings/vala/meson.build | 88 ++++++++++++++++++++++++++++-------------------
 2 files changed, 54 insertions(+), 36 deletions(-)
---
diff --git a/bindings/meson.build b/bindings/meson.build
index 626e4679..2fc8dd60 100644
--- a/bindings/meson.build
+++ b/bindings/meson.build
@@ -22,6 +22,6 @@ if get_option('gir') and (get_option('gtk3') or get_option('gtk4'))
   subdir('gir')
 endif
 
-if get_option('vapi') and get_option('gtk3')
+if get_option('vapi') and (get_option('gtk3') or get_option('gtk4'))
   subdir('vala')
 endif
diff --git a/bindings/vala/meson.build b/bindings/vala/meson.build
index ec1ddf0b..d27a1302 100644
--- a/bindings/vala/meson.build
+++ b/bindings/vala/meson.build
@@ -15,7 +15,6 @@
 # along with this library.  If not, see <https://www.gnu.org/licenses/>.
 
 assert(get_option('gir'), 'gir is required for vala support')
-assert(get_option('gtk3'), 'vala support only available for gtk3')
 
 add_languages('vala', required: true)
 
@@ -24,20 +23,6 @@ assert(valac.version().version_compare('>= 0.24.0'), 'vala >= 0.24 required')
 
 posix_dep = valac.find_library('posix')
 
-libvte_gtk3_vapi_deps = [
-  'gio-2.0',
-  'glib-2.0',
-  'pango',
-  'gtk+-3.0',
-]
-
-libvte_gtk3_vapi_dep = gnome.generate_vapi(
-  vte_gtk3_api_name,
-  sources: libvte_gtk3_gir[0],
-  packages: libvte_gtk3_vapi_deps,
-  install: true,
-)
-
 # Vala test application
 
 vapp_resource_data = files(
@@ -71,30 +56,63 @@ if valac.version().version_compare('>= 0.31.1')
   vapp_valaflags += '--disable-since-check'
 endif
 
-if gtk3_dep.version().version_compare('>= 3.16')
-  vapp_valaflags += '--define=GTK_3_16'
-endif
-
 vapp_incs = [
   top_inc,
   src_inc,
   vte_inc,
 ]
 
-vapp_deps = [
-  gio_dep,
-  glib_dep,
-  gtk3_dep,
-  libvte_gtk3_vapi_dep,
-  posix_dep,
-]
+if get_option('gtk3')
+  libvte_gtk3_vapi_deps = [
+    'gio-2.0',
+    'glib-2.0',
+    'pango',
+    'gtk+-3.0',
+  ]
+
+  libvte_gtk3_vapi_dep = gnome.generate_vapi(
+    vte_gtk3_api_name,
+    sources: libvte_gtk3_gir[0],
+    packages: libvte_gtk3_vapi_deps,
+    install: true,
+  )
+
+  if gtk3_dep.version().version_compare('>= 3.16')
+    vapp_valaflags += '--define=GTK_3_16'
+  endif
+
+  vapp_deps = [
+    gio_dep,
+    glib_dep,
+    gtk3_dep,
+    libvte_gtk3_vapi_dep,
+    posix_dep,
+  ]
+
+  vapp = executable(
+    'vala-test',
+    sources: vapp_sources,
+    include_directories: vapp_incs,
+    dependencies: vapp_deps,
+    c_args: vapp_cflags,
+    vala_args: vapp_valaflags,
+    install: false,
+  )
+endif
 
-vapp = executable(
-  'vala-test',
-  sources: vapp_sources,
-  include_directories: vapp_incs,
-  dependencies: vapp_deps,
-  c_args: vapp_cflags,
-  vala_args: vapp_valaflags,
-  install: false,
-)
+if get_option('gtk4')
+  libvte_gtk4_vapi_deps = [
+    'gio-2.0',
+    'glib-2.0',
+    'graphene-1.0',
+    'pango',
+    'gtk4',
+  ]
+
+  libvte_gtk4_vapi_dep = gnome.generate_vapi(
+    vte_gtk4_api_name,
+    sources: libvte_gtk4_gir[0],
+    packages: libvte_gtk4_vapi_deps,
+    install: true,
+  )
+endif