From time to time, i.e. after installing Xcode beta versions, your devices menu is messed up and will show only a long list of identifiers and duplicates. This script will rebuild the iOS simulators menu by creating all possible combinations of devices and system versions.

xcode-rebuild-ios-simulators-menu.rb

#!/usr/bin/env ruby

device_types  = []
runtimes = []

`xcrun simctl list`.each_line do |line|

  device_type_id = /\((com\.apple\.CoreSimulator\.SimDeviceType\..*?)\)/.match(line)
  if device_type_id then
    device_types << device_type_id[1]
  end

  runtime_id = /\((com\.apple\.CoreSimulator\.SimRuntime\..*?)\)/.match(line)
  if runtime_id then
    runtimes << runtime_id[1]
  end

  identifier = /\(([A-Z0-9-]+)\)/.match(line)
  if identifier then
    `xcrun simctl delete #{identifier[1]}`
  end

end

device_types.each do |device_type_id|
  device_name = /SimDeviceType\.(.*?)$/.match(device_type_id)[1].gsub("-", " ")
  runtimes.each do |runtime_id|
    runtime_name = /(\d\-\d)$/.match(runtime_id)[1].gsub("-", ".")
    command = "xcrun simctl create '#{device_name} (#{runtime_name})' '#{device_type_id}' '#{runtime_id}'"
    system(command)
    if $?.exitstatus != 0 then
      puts "Cannot create '#{device_name} (#{runtime_name})'"
    end
  end
end