shrink_itunes_within_screen.rb

#!/usr/bin/env ruby

require 'osx/cocoa'
include OSX
OSX.require_framework 'ScriptingBridge'

itunes = SBApplication.applicationWithBundleIdentifier( 'com.apple.itunes' )

itunes_window = itunes.windows.first

screen = NSScreen.screens.first
screen_width = screen.frame.width
screen_height = screen.frame.height

x = itunes_window.bounds.x
y = itunes_window.bounds.y
width = screen_width - x
height = screen_height - y

itunes_window.bounds = OSX::NSRect.new( x, y, width, height )