Re: [Emacs-diffs] /srv/bzr/emacs/trunk r100117: Run kill-emacs when exiting for display closed or SIGTERM/HUP.

[Jan D.]

On 2010-05-04 13:33, Stephen J. Turnbull wrote:

> Specifically, I can't recall ever saving *scratch* or " *Message-Log*"
> to wherever I started my session; I want to save it to a project-
> specific directory, which in typical cases for me is many characters
> of typing away from what getcwd would return.  (In fact, I often do
> C-x h M-w C-x b RET C-x C-f log RET C-y C-x C-s or the like.)

I don't save *scratch*, but I rely on the fact that
  C-x b *sc<TAB><RETURN> C-x C-f
makes it easy to open files where Emacs was started.


> Similarly, in my usage, it's very likely that the reason I have
> multiple sessions to choose from is that I split a session, by simply
> killing a bunch of buffers I don't need in the new session, and saving
> a desktop file somewhere appropriate.  AFAICT that place is highly
> unlikely to have anything to do with getcwd(), but I'm willing to
> listen to your explanation.

The way to get Emacs to load a desktop file when starting Emacs is to 
start Emacs in the directory where it was saved.  The --chdir emulated 
that.  I'm not saying that setting a desktop file to another directory 
is handled well by this, but it wasn't handeled at all previously.

It is obvious that the arguments against --chdir comes without any long 
term usage of restoring Emacs sessions through the session manager. 
Otherwise, this would have been fixed by those affected by it.  I'm not 
affected, as I start Emacs in the directory where I save my desktop (if 
I do save it that is).

What you are arguing for is an enhancement that works just as fine with 
or without --chdir.  With Emacs today, you can't restart an Emacs and 
load a desktop file saved in another place different from where Emacs is 
started.


> So my solution would be to (1) add `default-directory' to
> `desktop-locals-to-save' (which handles the default directory settings
> for *scratch* and " *Message-Log*", I think somebody already mentioned
> this),

This assumes you are using desktop.  If you restart an Emacs without any 
desktop saved, the default directory is still wrong.  But with --chdir 
it is not.


> (2) write the desktop file to somewhere appropriate (probably
> `desktop-dirname', maybe asking the user), (3) write a thunk library
>
>      (cd (or DESKTOP-DIRNAME "~"))
>      (load-user-init-file)          ; does Emacs have this?
>
> to ~/.emacs.d/sessions/xsm-XSM-CLIENT-ID.el, and set SmRestartCommand to
>
> emacs -q -l ~/.emacs.d/sessions/xsm-XSM-CLIENT-ID.el -clientId XSM-CLIENTID

There is no need to use -l or fiddle with SmRestartCommand, Emacs has 
had automatic save and restore of session data in a session file since 
2002 (actually, it is called ~/emacs.d/session-CLIENT-ID), but nobody 
has taken advantage of this fact AFAIK.

desktop.el would have to add a function to the hook 
emacs-save-session-functions that stores whatever data it needs to 
recover.  For example, the desktop file name in use.

        Jan D.