tweetstorm.rb

#!/usr/bin/env ruby

# Usage: tweetsplit.rb < tweetstorm.txt
# https://twitter.com/CoralineAda/status/869204799027372032
# Sam Stephenson / 2017-05-29

# Tweet-sized version:
# puts $<.read.split(/\s+/).reduce(nil){|(*cs,c),w|n=[c,w].compact*" ";cs+(n.size>140?[c,w]:[n])}*"\n"

def chunks_for(words, chunk_size)
  words.reduce([nil]) do |(*chunks, chunk), word|
    chunks + next_chunk(chunk_size, chunk, word)
  end
end

def next_chunk(chunk_size, chunk, word)
  candidate = [chunk, word].compact.join(" ")
  if candidate.size > chunk_size
    [chunk, word]
  else
    [candidate]
  end
end

puts chunks_for($<.read.split(/\s+/), 140).join("\n")