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>>>>> "Greg" == Greg Harvey <Greg.Harvey@thezone.net> writes:
Greg> This could be very cool,
This is just what comes from working in a very non-standard,
suboptimal, far-from-posix, sort-of-embedded kind of environment.
Greg> though it might be a bit difficult to have
Greg> more than one type cooperating (this would probably be a good place to
Greg> use an object system, so that you can have a concrete way of
Greg> determining which open method gets called in what order).
I think we should keep it as simple as possible and thus not tie it
intimately with objects systems.
A simple scheme would be to rely on a particular translation
functions. For instance, `load' would work as follows. It would
examine its argument, if it is a port continue with that. If it is
not, call `translate-path' on the argument.
`translate-path' (a semi-arbitrarily chosen name) would be responsible
for translating whatever argument into a port. The default definition
would accept a string which should designate a file valid for
`opne-input-file'. Each function that support translation would have a
documented translation function to call on non-port objects.
A user with a more sophisticated need would provide a new definition
of `translate-path', for instance to recognize urls, in order to
support the loading of scheme "files" directly off an web server.
So the simple customization consists of redefining the documented
translation functions (there can be more than one, but
`translate-path' is the only need I can think of right now). More
sophisticated schemes could be provided by apropriate overloading,
either by an object system or some table based thingy and can come
later (or follow the relevant extension, not everybody will want
object systems).
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Christian Lynbech | Telebit Communications A/S
Fax: +45 8628 8186 | Fabrik 11, DK-8260 Viby J
Phone: +45 8628 8177 + 28 | email: chl@tbit.dk --- URL: http://www.telebit.dk
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Hit the philistines three times over the head with the Elisp reference manual.
- petonic@hal.com (Michael A. Petonic)