bug#67444: [PATCH] FAQ: Improve explanation of showing file name in titlebar

[Eli Zaretskii <eliz@gnu.org>]

> Cc: Santiago Payà i Miralta <santiagopim@gmail.com>
> From: Santiago Payà i Miralta <santiagopim@gmail.com>
> Date: Sat, 25 Nov 2023 14:29:16 +0100
> 
> * doc/misc/efaq.texi (Displaying the current file name in the
> titlebar): Add example code to show the real file name in the
> titlebar, not just the buffer name, with the additional dired buffer
> case, and the last default buffer name.
> ---
>  doc/misc/efaq.texi | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/doc/misc/efaq.texi b/doc/misc/efaq.texi
> index 70f434d4b99..92622bd0527 100644
> --- a/doc/misc/efaq.texi
> +++ b/doc/misc/efaq.texi
> @@ -1960,6 +1960,17 @@ Displaying the current file name in the titlebar
>  (setq frame-title-format "%b")
>  @end lisp
>  
> +To show the path to the file when the buffer is visiting some file, or
> +the directory path when in a dired buffer, or just the name of the
> +buffer:
> +
> +@lisp
> +(setq frame-title-format
> +      '(buffer-file-name (:eval (abbreviate-file-name buffer-file-name))
> +                         (dired-directory dired-directory
> +                                          "%b")))
> +@end lisp
> +
>  @node Turning on abbrevs by default
>  @section How do I turn on abbrevs by default just in mode @var{mymode}?
>  @cindex Abbrevs, turning on by default

Thanks, but I don't want to recommend that users include :eval forms
in frame-title-format, as that could cause complications, and
generally slows down redisplay.