I'm using portal to execute functions for e.g running tests, reformatting code. I would like to have the same functionality as "select columns" for my own custom commands (being able to select options which is then sent as an input param to the handler)

That would be cool. How would you expect the API to work?

Initial idea was something like this:

(register! #'run-tests {:default     :uncommited-changes
                        :options     [:uncommited-changes
                                      :changes-for-branch
                                      :all-tests]
                        :option-form ..hiccup})