gistfile1.txt

# a dirty method to write all installed gems in a file as commands ready ... for installation
# useful when upgrading (even if rvm is a killer ;-) )

require "date"

def list_installed_gems
  gems  = `gem list`
  all_gems = gems.chomp!.split(/\n/)
  @f = File.open("gem_list_install_#{Date.parse(Time.now.to_s).to_s}.sh", "w")
  # create install commande
  all_gems.each do |gem|
    gem =~ /(\S+)\s\((.+)\)/im 
    @gem_name = $1
    # save them into arrays
    @gem_versions = $2.split(/,/)
    # print the commands
    @gem_versions.each do |gem_version|
      #puts "gem install #{@gem_name} --version=#{gem_version.strip} --no-ri --no-rdoc \n"
      @f.write("gem install #{@gem_name} --version=#{gem_version.strip} --no-ri --no-rdoc \n")
    end
  end
  @f.close
end 

list_installed_gems