halo.rb

require "gtk3"

app = Gtk::Application.new "rocks.veer66.Halo", :flags_none

app.signal_connect :activate do |app|
  window = Gtk::ApplicationWindow.new(app)
  window.set_title "Halo"
  vbox = Gtk::Box.new(Gtk::Orientation::VERTICAL)

  t1 = Gtk::TextView.new
  sw = Gtk::ScrolledWindow.new
  sw.set_policy(:automatic, :automatic)
  sw.add(t1)
  vbox.pack_start(sw, expand: true, fill: true, padding: 2)

  b1 = Gtk::Button.new label: "B1 ....", expand: false, fill: false, padding: 2
  b1.signal_connect "clicked" do |_|
    t1.buffer.insert_at_cursor(%x{ls})
    t1.buffer.insert_at_cursor("\n\n")
  end
  vbox.pack_start b1

  b2 = Gtk::Button.new label: "B2 ...", expand: false, fill: false, padding: 2
  vbox.pack_start b2

  b3 = Gtk::Button.new label: "B3 ...", expand: false, fill: false, padding: 2
  vbox.pack_start b3

  b4 = Gtk::Button.new label: "B4 ...", expand: false, fill: false, padding: 2
  vbox.pack_start b4

  b5 = Gtk::Button.new label: "Quit", expand: false, fill: false, padding: 2
  b5.signal_connect "clicked" do |_|
    window.destroy
  end
    
  vbox.pack_start b5

  window.add(vbox)
  window.show_all
end

app.run