A new candidate:
http://www.ocf.berkeley.edu/~tfb/cells_2.0pre2.tar.gz
This works for me in SBCL, LispWorks, CLISP, and and older OpenMCL. James, could you check this on your OpenMCL?
The only notable failure is CMUCL: it looks like Cells can trigger a bug in CMUCL's constructor optimizations. I'll try to file a bug before they release 19b, but for now it looks like CMUCL is in the partially supported category.
If there are no objections, I'll put this up on c-l.net tomorrow, and announce in whatever fora strike my fancy. I've appended the README file below:
***** About Cells *****
(Installation instructions follow)
Cells is a mature, stable extension to CLOS that allows you to create classes, the instances of which have slots whose values are determined by a formula. Think of the slots as cells in a spreadsheet (get it?), and you've got the right idea. You can use any arbitrary Common Lisp expression to specify the value of a cell. The Cells system takes care of tracking dependencies among cells, and propagating values. It is distributed under an MIT-style license.
Documentation is unfortunately quite lacking; the cells-devel list is still your best source of information. Some documentation can be found in the doc/ directory of the distribution. See the website at http://www.common-lisp.net/project/cells/ for more info.
Cells is written in almost-portable ANSI Common Lisp. It makes very light use of the introspective portions of the MOP, and contains a few workarounds for shortcomings in common implementations. It contains gratuitous use of silly reader conditionals (eg, #-chya, #-not, etc), so users wishing to push things like :TEST and :NOT on *FEATURES*, and users of the New Implementation of Lisp (NIL) should beware. If the last sentance didn't mean anything to you, you can ignore it.
Cells is known to currently work on the following Lisp implementations:
* Allegro * SBCL * CLISP * LispWorks * OpenMCL
Partially supported are:
* CMUCL * Corman Lisp * MCL
One of the Cells tests fails with CMUCL. This appears to be caused by a bug in its CLOS implementation, but has not been investigated in great depth.
Cells is belived to work with Corman CL, but has not been recently tested. In the past, MCL was supported, but a it does not currently pass the test suite. Ressurecting full support for any of these implementations should be easy.
Porting Cells to an unsupported but ANSI-conforming Lisp implementation should be trivial: mostly a matter of determining the package where the MOP lives. In reality, however, you might have to find workarounds for bugs in ANSI compliance.
***** Installation *****
[ Cells follows the usual convention for asdf and asdf-installable packages. If you know what that means, that's all you need to know. ]
Installation is trivial for asdf-install users:
(asdf-install:install :cells)
Users without asdf-install will need to download the distribution from common-lisp.net. If your implementation does not come with ASDF, please complain to the implementor, then load the asdf.lisp file included in the Cells distribution.
Unpack the distribution where you will.
Unix users: If you do not already have an asdf central registry, create a directory calld asdf-registry under your home directory and push this onto asdf:*central-registry*. Create symlinks there to the cells.asd and cells-test.asd files in the distribution. Alternately, follow the instructions for Windows users.
Windows and Classic Mac users: Push the directory where you unpacked the Cells distribution onto asdf:*central-registry*.
You can now load Cells in the usual manner for asdf.
SLIME:
,load-system cells
SBCL:
(require :cells)
Other systems:
(asdf:oos 'asdf:load-op :cells)
You may wish to run the test suite. To do so, use asdf to load the :cells-test system.