Update GFF records for tRNAs from identifiers in a different fasta file

gistfile1.rb

#!/usr/bin/env ruby

require 'bio'

trnas = Bio::FlatFile.auto('genes.fna').
  map(&:definition).
  grep(/tRNA_..._.../).
  map{|i| /^(?<id>\d+).+tRNA_(?<amino_acid>...)_(?<codon>...)/.match(i)}.
  inject(Hash.new){|h,i| h[i[:id]] = {:amino_acid => i[:amino_acid], :codon => i[:codon]}; h}


a,b = Bio::GFF::GFF3.new(File.read('assembly/annotations.gff')).
  records.partition{|i| trnas[i.id] }

a.map! do |i|
  i.attributes = {
    'feature_type' => 'tRNA',
    'Note'         => 'Codon: ' + trnas[i.id][:codon],
    'product'      => 'tRNA-'   + trnas[i.id][:amino_acid],
    'ID'           => i.id}
  i
end

puts a + b