xcodeproj gemでxcschemeを弄ってみる ref: http://qiita.com/kumabook/items/cea89fc2ac7c1691b0fe

file0.txt

#!/usr/bin/env ruby
require 'xcodeproj'

lang = ARGV[0]

if lang.nil?
  puts "no language is specified"
  exit 1
end

Dir.glob('**/*.xcodeproj').each do |path|
  proj_name   = File.basename(path, ".xcodeproj")
  me          = `whoami`.strip
  scheme_path = path + '/xcuserdata/' + me + '.xcuserdatad/xcschemes/' + proj_name + '.xcscheme'
  next if !File.exist? scheme_path
  scheme  = Xcodeproj::XCScheme.new(scheme_path)

  la =  scheme.launch_action

  if !la.nil?
    prev = la.xml_element.attribute("language") || "system"
    if lang == "system"
      la.xml_element.delete_attribute "language"
    else
      la.xml_element.add_attribute "language", lang
    end
    puts "change language from #{prev} to #{lang} of #{scheme_path}"
  end
  scheme.save!
end