grid.rb

if ARGV.count > 2
  puts 'ERROR - Wrong arguments'
  puts 'Usage: `ruby grid.rb <size> <grid_padding>`'
  exit
end

size         = (ARGV[0] || 10).to_i
grid_padding = (ARGV[1] || 2).to_i

grid = Array.new(size) { Array.new(size) { ['o', ' '].sample } }

border_partial = "+-#{'--' * grid_padding}"
border = "#{border_partial * size}+"

puts border

grid.each do |row|
  row.each_with_index do |element, i|
    print '|' if i == 0
    print "#{' ' * grid_padding}#{element}#{' ' * grid_padding}"
    print (i == size - 1 ? '|' : ' ')
  end

  puts

  (grid_padding - 1).times do
    print "|#{' ' * ((((grid_padding * 2) + 2) * size) - 1)}|\n"
  end
end

puts border