doctree-ruby is a Ruby gem for generating doctrees f.e. from HTML documents.
$ gem install doctree
Use html2doctree from the command line to extract links in list items from HTML pages:
curl https://en.wikipedia.org/wiki/Book | html2doctree --css "#toc"
See test/doctree_test.rb for examples in Ruby code.
After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.
Bug reports and pull requests are welcome on GitHub at https://github.com/ralfebert/doctree-ruby.