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Emacs packages in OCaml

Ecaml is a library for writing Emacs packages in OCaml. It uses Emacs 25 support for dynamic modules to load native OCaml code into Emacs.

Building a plugin

Using Dune

Compile your plugin using (modes (native shared_object)) in the executable stanza of your dune file. See example/dune for an example.

Using Jane Street jenga rules

Simply add (only_shared_object true) to the executables stanza in your jbuild. For instance:

 ((names (my_plugin))
  (libraries (ecaml))
  (only_shared_object true)))

Then build with jenga. This has been tested in opam using jane-build.

Using other build systems

You need to use the -output-complete-obj option of ocamlopt to produce a self-contained shared object file. For instance to build the plugin in the example/ directory:

$ ocamlfind ocamlopt -linkpkg -package ecaml -thread -output-complete-obj \
    -runtime-variant _pic -pp ppx-jane -o


As of Emacs version 25, Emacs supports plugins. Here is the API:

Here's a tutorial:

Here's an example plugin:


Note that Emacs modules must be GPL compatible, so you must make sure that your work based on Ecaml is released under a GPL compatible license.

Ecaml itself is released under the Apache 2.0 license which is GPL compatible.