Initial commit

src/gtktest.cr

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+require "libadwaita"
+
+require "./modules/prerequisites.cr"
+require "./modules/views/main.cr"
+
+module GtkTest
+  B_UI = Gtk::Builder.new_from_resource("/gtktest/ui/compiled/main.ui")
+
+  APP = Adw::Application.new("dev.gtktest", Gio::ApplicationFlags::None)
+end

src/modules/prerequisites.cr

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+module GtkTest
+  extend self
+
+  VERSION    = {{read_file("./shard.yml").split("version: ")[1].split("\n")[0]}}
+  {%
+    `blueprint-compiler batch-compile ./data/ui/compiled ./data/ui/ ./data/ui/*.blp`
+  %}
+  Gio.register_resource("data/gtktest.gresource.xml", "data")
+end

src/modules/views/main.cr

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+module GtkTest
+  @@main_window_id = 0_u32
+
+  def activate(app : Adw::Application)
+    main_window = APP.window_by_id(@@main_window_id)
+    return main_window.present if main_window
+
+    window = Adw::ApplicationWindow.cast(B_UI["mainWindow"])
+    window.application = app
+    
+    @@main_window_id = window.id
+
+    window.present
+  end
+
+  APP.activate_signal.connect(->activate(Adw::Application))
+  exit(APP.run(ARGV))
+end