tsv_to_yml.rb

require 'csv'
require 'yaml'

def read_tsv(filepath)
  table = CSV.read(filepath, col_sep: "\t", headers: true)
  table.map(&:to_h)
end

if ARGV.size == 2
  data = read_tsv ARGV[0]
  File.open(ARGV[1], 'w') { |file| file.write data.to_yaml }
else
  STDERR.puts 'usage: ruby tsv_to_yml.rb path/to/tsv path/to/yml'
end