module Tablelize

  VERSION      = "0.1.5"
  SEPARATOR    = ENV.fetch("TABLELIZE_SEPARATOR", "   ")
  HEADER_LINE  = ENV.fetch("TABLELIZE_HEADER_LINE", "")
  ALIGN_STRING = 1
  ALIGN_NUMBER = 2

  def self.table(rows)
    aligns = []
    widths = []
    rows.each_with_index do |row, line|
      row.each_with_index do |val, index|
        len = val.to_s.length
        widths[index] = len if widths[index].nil? || len > widths[index]

        if line > 0 and aligns[index] != ALIGN_STRING
          if val.is_a? Numeric
            aligns[index] = ALIGN_NUMBER
          else
            aligns[index] = ALIGN_STRING
          end
        end

      end
    end

    format = ""
    length = 0
    widths.each_with_index do |width, index|
      align = (aligns[index] == ALIGN_NUMBER) ? "" : "-"
      format = "#{format}%#{align}#{width}s#{SEPARATOR}"
      length += width
    end

    rows.each_with_index do |row, index|
      printf format.chomp(SEPARATOR) + "\n", *row
      if index == 0 and HEADER_LINE.length > 0
        puts HEADER_LINE * (length -1 + SEPARATOR.size * (rows.size - 1))
      end
    end
  end

end