Recursive solution to breaking up arbitrary text into tweet-sized chunks

chunker.rb

class Chunker
  
  def chunk_message(message, handle="", chunked=[])
    return chunked unless message.present?
    chunks = message.split
    proposed_chunk = [handle, chunked.last, chunks[0]].compact.join(' ').squish
    if proposed_chunk.length <= 140
      chunked << [chunked.pop, chunks.shift].compact.join(' ')
    else
      chunked << chunks.shift
    end
    chunk_message(chunks.join(' '), handle, chunked)
    chunked.map{ |chunk| handle.present? ? "#{handle} #{chunk}" : chunk }.flatten
  end
  
end

chunker_spec.rb

RSpec.describe Chunker do

  let(:client) { Chunker.new }
  let(:handle) { "@CoralineAda" }

  context "#chunk_message" do

    it "preserves a message of 140 characters without a handle" do
      message = "Justo Ligula Ipsum Nullam Tellus"
      expect(client.chunk_message(message).join(' ')).to eq(message)
    end

    it "preserves a message of 140 characters with a handle" do
      message = "Justo Ligula Ipsum Nullam Tellus"
      expect(client.chunk_message(message, handle).join(' ')).to eq("#{handle} #{message}")
    end

    it "truncates a long message without a handle" do
      message = "Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Morbi leo risus, porta ac consectetur ac, vestibulum at eros."
      chunked = client.chunk_message(message)
      expect(chunked[0]).to eq("Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Morbi leo risus, porta ac")
      expect(chunked[1]).to eq("consectetur ac, vestibulum at eros.")
    end

    it "truncates a long message with a handle" do
      message = "Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Morbi leo risus, porta ac consectetur ac, vestibulum at eros."
      chunked = client.chunk_message(message, handle)
      expect(chunked[0]).to eq("#{handle} Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Morbi leo")
      expect(chunked[1]).to eq("#{handle} risus, porta ac consectetur ac, vestibulum at eros.")
    end

  end

end

Proposed problem: https://twitter.com/CoralineAda/status/869204799027372032