module Column

# File lib/column.rb, line 35
def auto_column_count(items, width:, gap: DEFAULT_GAP)
  max_len = items.map { |item| TextAlign.plain_length(item) }.max
  cell_width = max_len + gap
  return 1 if cell_width <= 0

  [[width / cell_width, 1].max, items.length].min
end

# File lib/column.rb, line 16
def format(items, columns: nil, width: DEFAULT_WIDTH, gap: DEFAULT_GAP)
  names = Array(items).map(&:to_s).reject(&:empty?)
  return [] if names.empty?

  col_count = columns || auto_column_count(names, width: width, gap: gap)
  col_count = [[col_count, 1].max, names.length].min
  row_count = (names.length.to_f / col_count).ceil
  col_width = names.map { |name| TextAlign.plain_length(name) }.max

  row_count.times.map do |row|
    cells = col_count.times.map do |col|
      idx = col * row_count + row
      item = names[idx]
      item ? TextAlign.pad(item, col_width, align: :left) : ""
    end
    cells.join(" " * gap).rstrip
  end.reject(&:empty?)
end