Similar to `Enumerable#chunk_while`, where it tries to make each chunk sum to no more than `max`.

chunk_by_desired_max_value.rb

# Similar to `Enumerable#chunk_while`, where it tries to make each chunk sum to no more than `max`.
# If a value is greater than `max`, it becomes its own chunk. (This is the "desired" part – we don't reject values higher than `max`.)

class ChunkByDesiredMaxValue
  def self.call(enum, max, &block)
    block ||= -> { _1 }

    sum = 0

    enum.chunk_while { |a, b|
      a_value = block.(a)
      b_value = block.(b)

      sum += a_value

      if sum + b_value > max
        sum = 0
        false  # Split between a and b.
      else
        true  # Keep a and b together.
      end
    }
  end
end

# Silly example:
input = [ 7, 2, 3, 7, 11, 1, 2, 1, 3, 5, 9, 12, 5, 5, 5, 5 ].map(&:to_s)
pp ChunkByDesiredMaxValue.call(input, 10) { _1.to_i }.to_a