shells/gtk: init shell

shells/default.nix

@@ -7,6 +7,8 @@ with pkgs; {
   nix = callPackage ./nix.nix { };
   guile = callPackage ./guile.nix { };
   guile3 = callPackage ./guile.nix { guile = guile_3_0; };
+  gtk3 = callPackage ./gtk.nix { gtk = gtk3; libportal-gtk = libportal-gtk3; };
+  gtk4 = callPackage ./gtk.nix { gtk = gtk4; wrapGAppsHook = wrapGAppsHook4; libportal-gtk = libportal-gtk4; };
   hugo = callPackage ./hugo.nix { };
   rust = callPackage ./rust.nix { };
   tic-80 = callPackage ./tic-80.nix { };

shells/gtk.nix

@@ -0,0 +1,30 @@
+{ mkShell
+, wrapGAppsHook
+, desktop-file-utils
+, glib
+, appstream-glib
+, blueprint-compiler
+, libadwaita
+, libportal
+, libportal-gtk
+, gtk
+}:
+
+mkShell {
+  packages = [
+    # Most of the build inputs are from `gtk` package. And since build
+    # environment of the following packages is brought with `nix develop`, we
+    # don't need to list much of the common build systems like Meson.
+    wrapGAppsHook
+    gtk
+
+    glib
+    appstream-glib
+    desktop-file-utils
+
+    blueprint-compiler
+    libadwaita
+    libportal
+    libportal-gtk
+  ];
+}