[pro] User defined format functions

[Sam Steingold]

> * Didier Verna <qvqvre at yeqr.rcvgn.se> [2011-01-25 18:05:11 +0100]:
>
> I'm aware of the ~// construct, which I find extremely cumbersome.
> It seems to me that the package handling part,
> specifically, makes it totally unusable.
exactly.

> Does anybody actually use it?
yes.

> WDYT? Does something like that already exists[2]?

clisp has "~!"

http://clisp.sourceforge.net/impnotes/print-formatted.html

The additional FORMAT instruction ~! is similar to ~/, but avoids
putting a function name into a string, thus, you might not need to
specify the package explicitly.

(FORMAT stream "~arguments!" function object)

is equivalent to

(FUNCALL function stream object colon-modifier-p atsign-modifier-p arguments)


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