example.txt

BLAST protein YDL177C
BLAST dna YDL177C

runner.rb

Blastable = Struct.new(:type,:target)

def protein(target); Blastable.new(:protein,target); end
def dna(target);     Blastable.new(:dna,target);     end

def Object.const_missing(const, *args)
  # Maybe send this somewhere so the code is debuggable
  return const.to_s
end

def blast(blastable)
  puts "Performing a BLAST #{blastable.type} search for #{blastable.target}"
end
alias BLAST blast
alias Blast blast


text = File.open(ARGV.shift).read
self.instance_eval(text)