[Bug-apl] Request for feature: Back-channel interaction

[Juergen Sauermann]

Hello Elias,

I believe that the new native functions in GNU APL are the way go.

Instead of messing around with commands and their responses, you can
write C++ functions that have direct access to all the internals of GNU APL.

Put these functions into a shared library, say emacs.so. You can then
'emacs.so' ⎕FX 'EMACS' to get a user defined APL function EMACS that you
can "call" via stdin of GNU APL with their output on stdout. That makes
you filters simple and you still have access to everything you need.

See src/native for examples. I am currently working on a native FILE_IO that
shall provide all file related functions (fopen(), fclose(), ...) to GNU 
APL. You
may take that as a blueprint of how to use native functions.

/// Jürgen