Re: Display an eieio object

[Michael Heerdegen <michael_heerdegen@web.de>]

Joe Riel <joer@san.rr.com> writes:

> Is there a way to nicely display an eieio object?  Using
> describe-variable (C-h v) shows the values but not the slot names,
> which makes it less than helpful.

Depends a bit on your Emacs version.

Since Emacs 26, C-h v uses the new cl-print.el to print variable values.
Eieio implements the cl-print-object method for eieio-objects, and that
just falls back to `object-print'.  `object-print' also existed before
Emacs 26, but AFAIK it prints only a wrapper and no values at all.  You
would need to reimplement the `object-print' method to do what you want,
probably looping over the `eieio-class-slots'.  You can even use
different implementations for different classes - the infrastructure is
all there.  If you have a recent enough Emacs version, C-v should
automatically use your method implementation(s).


Michael.