Client Nodes (ie gui).

Luke Gorrie luke@REDACTED
Wed Mar 27 12:10:57 CET 2002

Eric Merritt <cyberlync@REDACTED> writes:

> In any case, my question is simple. Are there other GUI options?

If you want portability, you can't beat the One True Toolkit - Emacs.

There's an Emacs Lisp package called "distel" which gets you
Erlang-style processes and message passing, and connects them to
regular erlang nodes via the distribution protocol. In other words
it's an Elisp version of erl_interface and jive. You can download it

Here's a distel program that takes a callback function, and
node/module/fun/args, then does the RPC to the standard erlang RPC
server, and passes the result to the callback:

  (defun erl-rpc (k kargs node m f a)
    "Call {M,F,A} on NODE and deliver the result to the function K, as
    (apply K (cons rpc-result KARGS))."
      (erl-send (tuple 'rex node)		; Normal erlang-style {RegName, Node}
                ;; {Who, {M, F, A, GroupLeader}}
                (tuple erl-self (tuple 'call m f a erl-group-leader)))
      ;; Tell the scheduler that our next function is `erl-rpc-receive',
      ;; for when the reply arrives.
      (erl-yield #'erl-rpc-receive k kargs)))

  (defun erl-rpc-receive (k kargs)
    "This is essentially the receive clause of `erl-rpc'."
    (let ((msg (pop erl-mailbox)))
      ;; Message should be [tuple rex REPLY], i.e. {rex, Reply}
      (assert (and (tuplep msg) (eq 'rex (elt msg 1))))
      (apply k (cons (elt msg 2) kargs))))

And here's a high-level interface that you can bind to a key or call
from M-x:

  (defun erpc (node m f a)
    "Make an RPC to an erlang node."
    (interactive "SNode: \nSModule: \nSFunction: \nXArguments (expression): ")
    (erl-rpc (lambda (result) (message "RPC result: %S" result))
             m f a))

Just what you were looking for, right? ;-)

There's also a very small pman-clone included in the
distribution. This is quite new and only tested on GNU Emacs 20 and 21
on Linux sofar, and doesn't have some stuff like pattern-matching
receive, process links, etc just yet.


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