Provides various building blocks for building an Emacs-like text editor. It also provides a number of Scheme procedures that have the same name and similar functionality as the Emacs Lisp functions.

It uses the Swing tool-kit.

Plan

The plan is to use this together with the (unfinished) gnu.jemacs.lang package to provide a fully-functional re-implementation of Emacs Lisp which compiles to Java bytecodes. I'm hoping volunteers will help me make "JEmacs" into something useful. I have fairly clear ideas about much of what need to be done. Contact me if you are interested.

Home page

There is now a JEmacs home page. Also check out the Kawa home page.

Screen snapshot

There is a now a teaser screen snapshot.

Status

Very unfinished proof of concerpt. It is a functional but very minimal editor. Many of the core Emacs concepts (keymaps, windows, frames, buffers, markers) are implemented, and generally in such a way as to provide the standard Emacs semantics. There are Scheme functions with the same name and similar behavior as the standard Emacs Lisp functions. However, there is only a very limited set of core "editing" commands, and no searching commands. And it is not robust or reliable.

To-do

A couple of things volunteers might start with (but let me know before you spend serious time on any of these):

Usage

These classes depend on Swing, so make sure you have Swing available. Then make sure you have a version of the Kawa classes that contains the gnu.jemacs.buffer classes. (In other words, Kawa needs to have been configure --with-swing support.) Then just start Kawa in the usual way:
java kawa.repl
Then evaluate:
(emacs)
That brings up a Emacs window.

You can do (split-window) to create new (sub-)windows in an existing frame; type (make-frame) to create a new frame (to-level window), or do (get-buffer-create NAME) to create a new buffer. Note also how ctrl/B and ctrl/F have been bound to the correct functions. For other working key-bindings, look for the calls to define-key in emacs.scm.

The call (scheme-swing-window) creates a new Scheme interaction window.

License

Same as the package gnu.expr: Modified Gnu Public License. See the file COPYING. For now, the copyright holder is Per Bothner; in the future it may make more sense to make the FSF the copyright owner, since the plan is to use a lot of the existing ELisp packages once ELisp support is complete.

Author

Per Bothner, <bothner@gnu.org>