bug#29684: exception printers - request for improvement

[David Pirotte]

Hello,

        The attached patched is from Daniel Lloren, I'm just 'a messenger' (and 
added
        a comment in the source, preceding the new binding).

The proposed patch is to allow  exception printers user customization.

This has been very important, not to say vital, for those of us who manipulate 
large
structures, lists, arrays, sfri-4 bytevectors, ..., something we have been doing
locally ... but we need something for our users (aiscm, guile-cv ...), so they 
don't
have to patch guile locally... (most would be scared to do so and would not do 
it
anyway...).

Once applied, users can, for example, customize the raised exception system so 
it
uses truncated-print, either individually (in .guile), or guile admins can do
this globally (in share/guile-site/init.scm):

        (use-modules (ice-9 pretty-print))
                    
        (when (defined? 'exception-format)
          (set! exception-format
                (lambda (port fmt . args)
                  (for-each (lambda (arg)
                              (truncated-print arg #:port port))
                      args))))

Maybe there is another/better approach, I don't know, but this works pretty well
for me...

Thanks,
David

0002-Allowing-exception-printers-user-customization.patch
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pgpimXYri8op8.pgp
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