dune format-dune-file reads a dune file and outputs a formatted version.
This is a low-level command, meant to implement editor support for example. To
reformat a dune project, see the "Automatic formatting" section in
the manual.
Show this help in format FMT. The value FMT must be one of
`auto', `pager', `groff' or `plain'. With `auto', the format is `pager` or
`plain' whenever the TERM env var is `dumb' or undefined.