martin rudalics <rudalics@gmx.at> writes:

>
> since you don't want to split parent windows.

I decided to do this, since I also don't want my brain to start bleeding

> I attach a file called window-rotate.el which handles the above
> scenario.  In contrast with a window tree it simply operates on the old
> window structure of the frame directly which I store as an association
> list.  Note two aspects:
>
> (1) It always tries to find a leftmost live window to start operating
> on.  I think you do the same but I've never been able to understand how.

From looking at the code, same reason as you. The leftmost top window
is first window in a flattened window tree, then the recurisve descent
started from there.

The new function also does ame, but perfoms recursive ascent asc

> (2) It binds 'window-combination-limit' to make a parent window within
> something like the first combination you sketched above so this becomes
>
> |-------------|
> |      A      |
> |-------------|
> | ----------- |
> ||     B     ||
> ||-----------||
> ||     C     ||
> | ----------- |
> |-------------|

Wow! this is best thing since flush toilets, I was able to make the
function work with this.

Also, I plan on working on a cycle-windows function which will basiclly
change window-tree so that that the layout isn't changed, but the
windows are thing is.  This will be able to be properly done using
window--transpose-1, instead of window swap state which you said didn't
work.

> Half of the code is debugging code that is not commented.  Note that the
> code handles rotations only, rotates only the entire frame, does not set
> sizes and probably misses other things.  But it seems to work so please
> test it and maybe try to use as much of it as possible.

I looked at it, and could not really understnad it fully due to some low
level stuff, but I got the idea and incoroperated some logic of
windows-rotate.

It seems like window-configurations are kind of being reinvented except
in elisp, which is good.

The function I made, I feel like my approach is higher level then yours
cause I can't quite fully wrap my head around window management in
emacs.  So a lot of stuff, I don't know you can do.  But on other hand,
I feel the logic is also quite simpler, you can judge that.