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brew install ruby

gem install cocoa

require 'cocoa'

Cocoa::NSAutoreleasePool.new

app = Cocoa::NSApplication.sharedApplication
app.setActivationPolicy Cocoa::NSApplicationActivationPolicyRegular
app.activateIgnoringOtherApps true

alert = Cocoa::NSAlert.alloc.init.autorelease
alert.setMessageText "Hello world!"
alert.runModal

#!/usr/local/bin/ruby

require "cocoa"
Cocoa::NSAutoreleasePool.new

class UserInterface < Cocoa::NSObject
  attr_accessor :window, :btnHello, :btnGoodbye
  def init
    @window = NSWindow.alloc.initWithContentRect(NSRect.new(x: 0, y: 0, width: 250, height: 100), 
      styleMask: NSTitledWindowMask|NSClosableWindowMask|NSMiniaturizableWindowMask, 
      backing: NSBackingStoreBuffered, 
      defer: false).autorelease
    @window.setTitle "Welcome to Ruby"
    @window.setReleasedWhenClosed true
    @window.center

    @btnHello = NSButton.alloc.initWithFrame(NSRect.new x: 10, y: 10, width: 110, height: 80).autorelease
    @btnHello.setTitle "Hello!"
    @btnHello.setBezelStyle NSRegularSquareBezelStyle
    @btnHello.setSound NSSound.alloc.initWithContentsOfFile("/System/Library/Sounds/Tink.aiff", byReference:true).autorelease
    @window.contentView.addSubview btnHello

    @btnGoodbye = NSButton.alloc.initWithFrame(NSRect.new x: 130, y: 10, width: 110, height: 80).autorelease
    @btnGoodbye.setTitle "Goodbye!"
    @btnGoodbye.setBezelStyle NSRegularSquareBezelStyle
    @btnGoodbye.setSound NSSound.alloc.initWithContentsOfFile("/System/Library/Sounds/Basso.aiff", byReference:true).autorelease
    @window.contentView.addSubview btnGoodbye

    return self
  end
end

class AppDelegate < Cocoa::NSObject
  def init
    @ui = UserInterface.alloc.init.autorelease
    @ui.btnHello.setAction :hello
    @ui.btnGoodbye.setAction :goodbye
    return self
  end

  def hello sender
    puts "hello"
  end

  def goodbye sender
    puts "goodbye"
    $application.terminate nil
  end

  def applicationDidFinishLaunching notification
    @ui.window.makeKeyAndOrderFront self
  end

  def applicationShouldTerminateAfterLastWindowClosed sender
    return true
  end

end

$application = Cocoa::NSApplication.sharedApplication
$application.setActivationPolicy Cocoa::NSApplicationActivationPolicyRegular
$application.setDelegate AppDelegate.alloc.init.autorelease
$application.activateIgnoringOtherApps true
$application.run