irb_vim.rb

require 'tempfile'
def vi(txt, arguments_str = "")
  Tempfile.open('rubyview') do | file |
    file << txt
    file.close
    cmd = "vim #{arguments_str} \"#{file.path}\""
    system( cmd )
  end  
end

class String
  def to_vi(filetype = "")
    vi( self, "-c 'set filetype=#{filetype.to_s}'" )
  end
end