[slime-devel] UTF-8 support for slime in Lispworks back end

[Alain Picard]

Dear Slimers,

I've implemented support for Lispworks in slime so that
all characters exchanged between emacs and lispworks
are LW:SIMPLE-TEXT-STRING (vectors of LW:SIMPLE-CHAR) which
allow one to directly send and receive korean, japanese etc
characters from the REPL, and to hit C-c C-c on a utf-8
encoded file w/o blowing up the slime connection.

Example transcript:

    XOS> (ui:caption 'are-you-sure-to-proceed)
    "계속 하시겠습니까?"
    XOS> (type-of *)
    LISPWORKS:SIMPLE-TEXT-STRING


Limitations:

 * You MUST have set your lispworks to use LW:SIMPLE-CHAR
   by default.  (see LW:SET-DEFAULT-CHARACTER-ELEMENT-TYPE)

   For us, this is done at time of delivery for the text
   console that we use to connect slime to.

 * You MUST be in an image where a recent FLEXI-STREAMS
   is loaded (i.e. :FLEXI-STREAMS must be on the features list.)
   Failure to satisfy this reverts you to the previous,
   broken behaviour.  :-)

 * Only 1 type of connection to lispworks is allowed; i.e.
   you can't have one latin-1 and one utf-8 connection simultaneously.
   This is because I couldn't find out how to inspect the current
   connection to determine what external-format it had been opened
   with.  Maybe somebody can fix this.

 * You can then set your emacs with this
   (setq slime-net-coding-system 'utf-8-unix)
   and have a UTF-8 interaction with lispworks.

This patch is taken against a (very recent) tip checkout, and
should apply cleanly, I hope.

Cheers!

                                Alain Picard

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