class Prawn::Table

def column_widths


sizes, you should specify more column widths manually.
you see weird problems like CannotFit errors or shockingly bad column
at guessing a good size for columns that have vastly different content. If
Because the natural widths can be silly, this does not always work so well

the table or column size.
each cell's min_width, max_width, and any user-specified constraints on
Calculate and return the constrained column widths, taking into account 
def column_widths
  @column_widths ||= begin
    if width - cells.min_width < -Prawn::FLOAT_PRECISION
      raise Errors::CannotFit,
        "Table's width was set too small to contain its contents " +
        "(min width #{cells.min_width}, requested #{width})"
    end
    if width - cells.max_width > Prawn::FLOAT_PRECISION
      raise Errors::CannotFit,
        "Table's width was set larger than its contents' maximum width " +
        "(max width #{cells.max_width}, requested #{width})"
    end
    if width - natural_width < -Prawn::FLOAT_PRECISION
      # Shrink the table to fit the requested width.
      f = (width - cells.min_width).to_f / (natural_width - cells.min_width)
      (0...column_length).map do |c|
        min, nat = column(c).min_width, natural_column_widths[c]
        (f * (nat - min)) + min
      end
    elsif width - natural_width > Prawn::FLOAT_PRECISION
      # Expand the table to fit the requested width.
      f = (width - cells.width).to_f / (cells.max_width - cells.width)
      (0...column_length).map do |c|
        nat, max = natural_column_widths[c], column(c).max_width
        (f * (max - nat)) + nat
      end
    else
      natural_column_widths
    end
  end
end