Re: Buffer listing in multiple frames/ttys

[lorentey@elte.hu (Károly Lőrentey)]

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[emacs-devel in Cc: because I think the included patch should be
applied on the CVS trunk.]

Len Trigg <lenbok@gmail.com> writes:
> Many years ago I chose XEmacs, mainly becuase (at the time) it was the
> only one that supported font-lock in a tty and multiple tty
> connections to the one server.  A few months ago I switched over to
> FSF Emacs-multi-tty and so far it's been going pretty well.  One
> difference that has been niggling me is that XEmacs used to keep the
> recently-used buffer listing on a per-tty/frame basis, whereas
> Emacs-multi-tty seems to just have a global list.

I have good news!  Emacs has per-frame buffer-lists as well: see
<info:(elisp)The Buffer List>.

> For example, I typically have separate emacs tty's for my mail client,
> for calendar/diary, and for my coding.  In XEmacs, list-buffers called
> from the coding tty would list all the code-related buffers at the
> top, whereas in multi-tty emacs, I get a mixture of buffers from all
> three ttys.  It's obvious that the XEmacs way is preferrable.  Is
> there any chance of this feature being implemented in the multi-tty
> patch? (or is it even something that applies to the main Emacs
> branch?)

`list-buffers' (C-x C-b) does not use the frame-local buffer-list, but
rather the global one.  This seems like a bug in the CVS trunk, easily
fixed by a one-line patch:


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--- orig/lisp/buff-menu.el
+++ mod/lisp/buff-menu.el
@@ -717,7 +717,7 @@
 				   (if (memq c '(?\n ?\s)) c underline))
 				 header)))))
       ;; Collect info for every buffer we're interested in.
-      (dolist (buffer (or buffer-list (buffer-list)))
+      (dolist (buffer (or buffer-list (buffer-list (selected-frame))))
 	(with-current-buffer buffer
 	  (let ((name (buffer-name))
 		(file buffer-file-name))

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2005-11-24  Lőrentey Károly  <lorentey@elte.hu>

	* buff-menu.el (list-buffers-noselect): Display the selected
          frame's buffer list, not the global one.

Any objections?

> (The other issue is that other ttys get blocked if one of them is
> waiting on input in the minibuffer.  Apparently this single keyboard
> mode is intentional, but it's annoying nontheless, and certainly a
> trick for new players)

I agree, but it's very hard to fix it.  I wonder what did the XEmacs
developers do; did they simply ignore the underlying problem?

-- 
Károly

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