1  module Kernel
   2    # Require a library with fallback to RubyGems.  Warnings during library
   3    # loading are silenced to increase signal/noise for application warnings.
   4    def require_library_or_gem(library_name)
   5      silence_warnings do
   6        begin
   7          require library_name
   8        rescue LoadError => cannot_require
   9          # 1. Requiring the module is unsuccessful, maybe it's a gem and nobody required rubygems yet. Try.
  10          begin
  11            require 'rubygems'
  12          rescue LoadError => rubygems_not_installed
  13            raise cannot_require
  14          end
  15          # 2. Rubygems is installed and loaded. Try to load the library again
  16          begin
  17            require library_name
  18          rescue LoadError => gem_not_installed
  19            raise cannot_require
  20          end
  21        end
  22      end
  23    end
  24  en