Generating documentation — dune documentation

# Generating documentation

## Prerequisites

Documentation in dune is done courtesy of the odoc tool. Therefore, to generate documentation in dune, you will need to install this tool. This should likely be done with opam:

    $ opam install odoc

## Writing documentation

Documentation comments will be automatically extracted from your OCaml source files following the syntax described in the the section `Text formatting` of the OCaml manual.

Additional documentation pages may by attached to a package can be attached using the documentation stanza.

## Building documentation

Building the documentation using the `@doc` alias. Hence, all that is required to generate documentation for your project is building this alias:

    $ dune build @doc

An index page containing links to all the opam packages in your project can be found in:

    $ open _build/default/_doc/_html/index.html

Documentation for private libraries may also be built with:

    $ dune build @doc-private

But this libraries will not be in the main html listing above, since they do not belong to any particular package. But the generated html will still be found in `_build/default/_doc/_html/<library>`.

### Examples

This stanza use attach all the .mld files in the current directory in a project with a single package.

    (documentation)

This stanza will attach three mld files to package foo. The `mld` files should be named `foo.mld`, `bar.mld`, and `baz.mld`

    (documentation
     (package foo)
      (mld_files foo bar baz))

This stanza will attach all mld files excluding `wip.mld` in the current directory to the inferred package:

    (documentation
     (mld_files :standard \ wip))

## Passing options to Odoc

    (env
     (<profile>
      (odoc <optional-fields>)))

See env for more details on the `(env ...)` stanza. `<optional-fields>` are:

- `(warnings <mode>)` specifies how warnings should be handled. `<mode>` can be: `fatal` or `nonfatal`. The default value is `nonfatal`. This field is available since Dune 2.4.0 and requires Odoc 1.5.0.