YAML_to_TSV.rb

YAML_to_TSV.rb

#!/usr/bin/env ruby
require 'yaml'

# Reading file from command line input and declaration of variables
stu_info = YAML.load(File.read(ARGV[0]))
flag = false
keyarr = []
valuearr = []
wholevalue = []

# Method reads the key of only one hash element in the stu_info array.
# Every value of each hash in the array in copied to a temporary array
# That temp array is then pushed to an array of array called wholevalue
stu_info.each do |unique|
  unique.each do |a, b|
    keyarr.push a if flag == false
    valuearr.push b
  end
  wholevalue.push valuearr
  valuearr = []
  flag = true
end

# Function places the keyarr at the beginning of wholevalue array
wholevalue.unshift(keyarr)

# Data from wholevalue is written to a file
if ARGV[1]
  File.open(ARGV[1], 'w') do |file|
    wholevalue.each do |line|
      file.puts line.join("\t")
    end
  end
else
  File.open('Default.tsv', 'w') do |file|
    wholevalue.each do |line|
      file.puts line.join("\t")
    end
  end
end