some_spec.rb

require 'spec_helper'

# old code
# RSpec.describe "Feature 1" do
#
# end

# new code
Foo.rspec_describe "Feature 1", __PATH__ do
  #
end

support_foo.rb

module Foo
  class << self
    def rspec_describe(string, file, &block)
      
      # I want to get the path of the current spec, but how?
      # I want to get the path of the current spec, but how?
      # I want to get the path of the current spec, but how?
      puts "I am running on file #{file}"
    
    end
  end
end