If you're on the Puppet docs team: We moved these scripts into the main puppet-docs repo! They're in the util folder. You have to run them with bundle exec, like bundle exec ./util/mangle_files output/pe/2017.2/*.html.
Don't download and use this version of the scripts! Use the built-in one!
The two executable scripts are sentence_segmenter.rb and sentence_unsegmenter.rb.
In order to run these scripts, you'll need to put them somewhere on your PATH. /usr/local/bin is a good bet, unless you have another place you like to keep your scripts.
I meant for you to be able to use bundle install and bundle exec to run these, but unfortunately, installing Nokogiri with bundler on Mac is a recipe for misery. So you'll need to run:
sudo gem install nokogiri
sudo gem install pragmatic_segmenter
sudo gem install punkt-segmenter
before running these scripts.
The scripts work with regular shell globs too, so if you have your HTML fragments in a folder, you can cd to that folder and run sentence_segmenter.rb *.html.