fastlane_xcodegen_bump_version.rb

def bump_version
  require 'yaml'  
  
  project_file_path = "../project.yml"
  project = YAML.load_file(project_file_path)

  setting_groups = project["settingGroups"] || {}
  app_base_settings = setting_groups["appBaseSettings"] || {}
  current_version = app_base_settings["MARKETING_VERSION"]
  current_build_number = app_base_settings["CURRENT_PROJECT_VERSION"] || 0

  current_version_number = version_string(current_version, current_build_number)
  puts("Current version -> #{current_version_number}")
  
  new_build_number = current_build_number + 1
  
  new_version_number = version_string(current_version, new_build_number)
  puts("Bump version -> #{new_version_number}")

  app_base_settings["CURRENT_PROJECT_VERSION"] = new_build_number
  File.open(project_file_path, "w") do |file|
    file.write project.to_yaml
  end  

  git_commit(
    path: "project.yml", 
    message: "Bump version to #{new_version_number}"
  )
  
  new_version_number
end

def version_string(version_number, build_number)
  "iOS #{version_number} (#{build_number})"
end