Converts R filenames from camel case to snake case.

convert_camel_to_snake.rb

#!/usr/bin/env ruby -n
name = $_
if name != name.upcase
  puts "mv #{name.chomp} #{name.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').gsub(/([a-z\d])([A-Z])/,'\1_\2').downcase.gsub('.r', '.R').gsub('r/','R/')}"
end