Will add a method to Array to print out a pretty text table of a multi-dimensional array

tabalize_array.rb

class Array
  def tabalize(headings, justifications = nil, out = STDOUT)
    raise ArgumentError.new('only works on an array of arrays') if size > 0 && ![0].is_a?(Array)
    raise ArgumentError.new('headings, justifications and array elements must all have the same number of elements') if size > 0 && (headings.size != [0].size) && (!justifications.nil? && (headings.size != justifications.size))
    sizes = Array.new(headings.size, 0)
    headings.each_with_index do |h,i|
      sizes[i] = [sizes[i], h.to_s.length].max
    end
    each do |row|
      row.each_with_index do |e, i|
        sizes[i] = [sizes[i], e.to_s.length].max
      end
    end
 
    print_tablalize_lines(out, sizes)
 
    out.write "| "
    sizes.each_with_index do |s, i|
      out.write " | " if i > 0
      out.write headings[i].ljust(s, ' ')
    end
    out.write " |\n"
 
    print_tablalize_lines(out, sizes)
 
    each do |row|
      out.write "| "
      sizes.each_with_index do |s, i|
        out.write " | " if i > 0
        out.write row[i].to_s.send("#{justifications[i].to_s[0..0]}just", s, ' ')
      end
      out.write " |\n"
    end
 
    print_tablalize_lines(out, sizes)
  end
 
private
  def print_tablalize_lines(out, sizes)
    out.write '+-'
    sizes.each_with_index do |s, i|
      out.write "-+-" if i > 0
      out.write "".ljust(s, '-')
    end
    out.write "-+\n"
  end
end