bug#52566: 29.0.50; Wishlist: There should be a print-unreadable-function variable

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> It should be called from print_vectorlike (and any other places that
> print unreadable objects, but I'm not sure there are any other places),
> and should probably have a signature like
>
> OBJECT PRINTCHARFUN ESCAPEFLAG
>
> If it returns nil, the object should be printed as normal.
>
> This can then be used to implement a `readablep' function (that would
> bind this to a function that signals an error, and then catch that
> error), and also to possibly make an alternative version of prin1 that
> returns whether it printed something unprintable.

This has now been implemented in Emacs 29.  The function interface was
changed a bit, though.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no