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Re: moving window handling into lisp

From: Miles Bader
Subject: Re: moving window handling into lisp
Date: Mon, 27 Jul 2009 23:00:53 +0900

martin rudalics <address@hidden> writes:
>>    window-parent WINDOW         => PARENT-WIN
>>    set-window-children WINDOW LEFT-CHILD-WIN RIGHT-CHILD-WIN
> `window-parent' and `window-children' would be trivial.  Providing
> `set-window-children' is hardly feasible IMHO.  Who'd be responsible for
> calculating the respective sizes?

Currently split-window does, and that doesn't seem particularly

Certainly set-window-children has to do a fair bit of sanity checking,
but it's not going to be any greater than that currently done by
split-window, and that function isn't all that complicated.

>> A brief look suggests that much of the traditional window handling
>> code (`window-list', `other-window', `split-window', `delete-window',
>> `delete-other-windows', etc) could then be moved into lisp; none of
>> that code looks very complicated or dangerous.
> The problem with `split-window' and `delete-window' is that you can
> easily mess up things when you create windows that don't have the right
> size.  From my experience this usually makes Emacs crash pretty soon and
> we shouldn't allow Elisp code crash Emacs.  OTOH doing all the necessary
> checks wrt window sizes in `set-window-children' would mean hard work.

Hmm, I dunno why it's hard -- just copy the appropriate bits from split-window.

Maybe set-window-children would end up being mostly sanity-checking
code, but that's OK -- it'll probably be smaller than split-window, and
will serve as a nice low-level interface.

> martin, whose `switch-to-buffer' is in window.el

Wait... switch-to-buffer is in C...


Generous, adj. Originally this word meant noble by birth and was rightly
applied to a great multitude of persons. It now means noble by nature and is
taking a bit of a rest.

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