Feels to me like this is begging to be a method call:

```ruby
def install(standalone = false)
  jobs = [Bundler.settings[:jobs].to_i, 1].max
  if jobs > 1 && can_install_parallely?
    install_in_parallel jobs, options[:standalone]
  else
    install_sequentially options[:standalone]
  end
end

existing_gems = install(options[:standalone])
```