Options from extracted gems are not output via CLI

[ashmaroli]

After having installed kramdown-2.0.0, running kramdown --help doesn't surface options from the extracted gems.

kramdown --help

I also used a Gemfile and tried again with bundle exec. Still no success!

# Gemfile

gem 'kramdown', '~> 2.0'
gem 'kramdown-parser-gfm'

$ bundle exec kramdown --help

What should a user do to surface options from kramdown-parser-gem gem in the --help output?

[gettalong]

kramdown automatically loads a parser if it is used. So kramdown -i GFM still works, as would kramdown -o pdf for the PDF converter.

I'm open to suggestions for making the options of third-party extensions available to the kramdown binary.

[ashmaroli]

A simple route would be a introducing a new flag say -x, --extension [GEM-NAME, [GEM_NAME_2...]]
Usage would be:

$ kramdown -x parser-gfm
# => kramdown options + GFM Parser options

$ kramdown -x parser-gfm, syntax-coderay
# => kramdown options + GFM Parser options + CodeRay options

The binary can abort with an error message if the given extension raises a LoadError exception

[gettalong]

I have committed a change which allows specifying extensions. Once specified, the options from the extension can be used with the binary and are shown with the --help option.