xco.rb

#!/usr/bin/ruby

projects = Dir.glob("*.xcworkspace") + Dir.glob("*.xcodeproj")

if projects.count > 1
	puts "Choose file to open:"
	projects.each_index do |i|
		num = i + 1
		puts "#{num}: #{projects[i]}"
	end 
	print "> "
	num = gets.chomp.to_i
	if num <= 0 or num > projects.count
		puts "Wrong number for project"
		exit
	end
	project = projects[num.to_i - 1]
else
	project = projects.first
end

`open "#{project}"`