OCaml documentation generator
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NOTE: codoc is now deprecated in favour of https://github.com/ocaml-doc/odoc

codoc is a new OCaml documentation tool. It does not impose any specific package manager on you or assume a specific workflow. codoc requires at least OCaml 4.02.2.

Quick Start

You first need to set-up an opam switch with the right environment. We are working on making our tools and patches properly integrated upstream, so in the future these steps won't be necessary.

opam switch doc -A 4.02.2 # Switch into an empty `4.02.2` switch
export OCAMLPARAM=_,bin-annot=1
eval `opam config env`

Once this is done, you can install your opam packages as usual.

opam install ... # Install your package set.

Finally, installing codoc itself will be useful.

opam install codoc

codoc supplies an opam doc command to generate cross-referenced documentation for all packages on an opam switch. This program uses codoc's scriptable CLI and and also offers an easy-to-use --serve option for immediately starting a web server for your opam installation's documentation. Using opam doc is as easy as:

opam doc my-opam-doc/

The HTML documentation for all packages on the current switch will be created in my-opam-doc/ by opam doc. When using --serve, the documentation will be generated for the HTTP scheme (omitting index.html) and cohttp-server-lwt will be started in the output directory.

The codoc Tool

To generate HTML documentation from a build directory containing files compiled with OCaml 4.02.2, simply run:

codoc doc [CMTI_DIR] -o [OUTPUT_DIR]

codoc will recursively search for .cmti files in CMTI_DIR and use their relative paths to construct a parallel directory hierarchy in OUTPUT_DIR. Of course, you can also run codoc on individual files and OUTPUT_DIR (or OUTPUT_FILE) does not need to exist.

codoc will refuse to overwrite already extracted or rendered documentation unless the -f flag is provided.

codoc understands package hierarchies. To output documentation for a specific package, simply pass --package followed by a slash/separated/package/path. The OUTPUT_DIR will be the base of the hierarchy and the documentation inside will cross-reference.

codoc doc has some other options that are described below in the section about the html subcommand.

Scriptable Command Line

The doc subcommand of codoc is actually a composition of 3 different subcommands: extract, link, and html. Each of these commands can take the -f and --index arguments. Documentation indexes can be generated by providing the --index flag.

The html subcommand takes extra options, --css, --scheme, and --share. It does not yet support --package, though, support is planned. Of these, --scheme file is the most useful for browsing documentation in a web browser directly off of the disk.


The toolchain that codoc realizes was designed to have many interfaces to subcomponents should you wish to customize your documentation generation more radically than the tool provides.

octavius parses documentation comments written in ocamldoc format.

doc-ock parses OCaml interfaces, exposes types for signatures and identifiers, and defines resolution procedures. doc-ock uses octavius for documentation comment parsing.

doc-ock-xml defines XML serialization and parsing for the types in doc-ock. This XML format will eventually provide mechanism for extensible documentation content.

codoc defines a documentation index XML format for tracking package hierarchies, documentation issues, and hierarchically localized configuration. codoc also defines a scriptable command-line interface.

Most of these interfaces are not stable. The basics of codoc's CLI, though, are likely to remain consistent.


Contributions are very welcome! Please feel free to report issues, ideas, comments, or concerns to the codoc issue tracker.

Documentation Feature Tests

See dsheets/ocamlary-test-library for some documentation feature tests.