* Display an eieio object
@ 2018-06-14 14:45 Joe Riel
2018-06-15 1:18 ` Pierre Lorenzon
2018-06-15 3:53 ` Michael Heerdegen
0 siblings, 2 replies; 4+ messages in thread
From: Joe Riel @ 2018-06-14 14:45 UTC (permalink / raw
To: Help GNU Emacs
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.
--
Joe Riel
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Display an eieio object
2018-06-14 14:45 Display an eieio object Joe Riel
@ 2018-06-15 1:18 ` Pierre Lorenzon
2018-06-15 3:53 ` Michael Heerdegen
1 sibling, 0 replies; 4+ messages in thread
From: Pierre Lorenzon @ 2018-06-15 1:18 UTC (permalink / raw
To: joer; +Cc: help-gnu-emacs
Hi,
From: Joe Riel <joer@san.rr.com>
Subject: Display an eieio object
Date: Thu, 14 Jun 2018 07:45:08 -0700
> Is there a way to nicely display an eieio object?
Depending where you want to launch the displaying from. By
simply issuing a command from the interactive emacs ara I
dont think so. By writing a small piece of code : everrything
is possible ! In fact, more precisely the
`eieio-customize-object' is appliable on every eieio object
and display it in a readable form, not as C-h v does !
But this method cannot be called interactively. Moreover it
is subject to object definition. If slot customization has
not been defined properly displaying can be very bad.
You may say that `eieio-customize-object' is not the right
method for you since you only want to see the object and not
interact with it. Anway at least in my knowledge there is no
weaker method that only allows to show the object without
interacting with it.
Notice that interaction is determined by all type of
interactions provided by the widget package, since
eieio-customize-object is based on the widget package.
Regards
Pierre
> Using describe-variable (C-h v) shows the
> values but not the slot names, which makes it less
> than helpful.
>
> --
> Joe Riel
>
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Display an eieio object
2018-06-14 14:45 Display an eieio object Joe Riel
2018-06-15 1:18 ` Pierre Lorenzon
@ 2018-06-15 3:53 ` Michael Heerdegen
2018-06-15 14:36 ` Joe Riel
1 sibling, 1 reply; 4+ messages in thread
From: Michael Heerdegen @ 2018-06-15 3:53 UTC (permalink / raw
To: Joe Riel; +Cc: Help GNU Emacs
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.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Display an eieio object
2018-06-15 3:53 ` Michael Heerdegen
@ 2018-06-15 14:36 ` Joe Riel
0 siblings, 0 replies; 4+ messages in thread
From: Joe Riel @ 2018-06-15 14:36 UTC (permalink / raw
To: Michael Heerdegen; +Cc: Help GNU Emacs
On Fri, 15 Jun 2018 05:53:29 +0200
Michael Heerdegen <michael_heerdegen@web.de> wrote:
> 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).
Thanks. Having only recently upgraded to Emacs 25, it will probably
be a while until I can use that, but will plan accordingly.
--
Joe Riel
^ permalink raw reply [flat|nested] 4+ messages in thread
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