Generates a table of farmers/cows given a file with one name per line.

gen_rel_table.rb

#!/usr/bin/ruby
fh = File.new('names.csv', 'r')

names = []
while line = fh.gets
  line.chomp!
  names << line
end

names = names.shuffle
farmers = names[0, 75]
cows = names[75, names.count]

def rand_thingy(thingy)
  count = thingy.count
  idx = rand(0..count)
  thingy[idx]
end

ffile = File.new('fdata.csv', 'w')

findex = {}
farmers.each_with_index do |farmer, index|
  findex[farmer] = index
  ffile.puts "#{index},#{farmer}"
end
ffile.close

cindex = {}
cows.each_with_index do |cow, index|
  cindex[cow] = index
end

cfile = File.new('cdata.csv', 'w')

while !cows.empty?
  farmer = rand_thingy(farmers)
  cow = cows.pop
  cow_id = cindex[cow]
  farmer_id = findex[farmer]
  cfile.puts "#{cow_id},#{farmer_id},#{cow}"
end
cfile.close