OptEnvConf.Doc

Render the output of --version

Derive parser documentation

API Note: We return a Maybe inside the AnyDocs so that we can keep track of hidden settings and use this information to know whether settings are optional or not.

Render the output of top-level --help

Render the output of a --help with at least one command

Render the output of `--render-man-page` for reading with man

Render reference documentation

Render long-form documentation of options

Render short-form documentation of options

Render documentation of envionment variables

Render documentation of configuration values