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bug#13152: 24.2.90; [REGRESSION] dired-get-marked-files changed


From: Juri Linkov
Subject: bug#13152: 24.2.90; [REGRESSION] dired-get-marked-files changed
Date: Thu, 13 Dec 2012 01:11:39 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (x86_64-pc-linux-gnu)

>> I see no problems with this.
>
> See dired-guess-shell-alist-user, COMMAND can be an expression which is
> eval'd in different contexts (buffers) and that is a problem.

Actually I meant there is no bug because the documentation of
dired-guess-shell-alist-user says nothing about the current buffer.

But indeed you have a problem when trying to do undocumented things.
Without changing the source code you can reuse the existing variable
`files' dynamically bound in `dired-guess-shell-command' like:

(progn
  (require 'dired-x)
  (setq dired-guess-shell-alist-user
        '(("." (progn
                 (message "%S" files)
                 (let (dired-guess-shell-alist-user)
                   (dired-guess-default files)))))))

This is bad practice but acceptable for ~/.emacs.

Regarding changing the current buffer in `dired-mark-pop-up'
where an expression is evaluated, I have doubts because
it might broke code that relies on the fact that the
selected window and the current buffer should be " *Marked Files*"
as it was in all older versions.





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