[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: How to know is a buffer is a temporary one?
From: |
Sebastien Vauban |
Subject: |
Re: How to know is a buffer is a temporary one? |
Date: |
Tue, 30 Jul 2013 09:33:46 +0200 |
User-agent: |
Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.3 (windows-nt) |
Stefan Monnier wrote:
>>> Maybe you're better off trying to define "useful buffer" for your
>>> particular case. E.g. maybe check `buffer-file-name'.
>> Then a version checking with a regexp seems slightly more efficient
>> (1.19 s vs 1.14 s) than the one checking the name with a substring:
>
>> ;; (while (< i 1000)
>> ;; (message "%s" i)
>> ;; (if (equal (substring (buffer-name) 0 2) " *")
>> ;; (message "this is a temp buffer")
>> ;; (message "this is not a temp buffer"))
>> ;; (setq i (+ i 1)))
>
> should be
>
> (while (< i 1000)
> (message "%s" i)
> (message (if (eq (aref (buffer-name) 0) ?\s)
> "this is a temp buffer"
> "this is not a temp buffer"))
> (setq i (+ i 1)))
Performance-wise, both versions are equal (1.19s). Still slightly behind the
`string-match' version (1.14s).
Why are you saying that that version somehow better is? Was it for perf
reasons, or for other reasons? I'm asking because I want to learn more...
> Note that some buffers that start with " *" are shown to the user.
> So, the notion of temporary/internal depends on the particular situation
> (which is why it's not formally defined). In some cases
> buffer-file-name is a good test, in other cases (get-buffer-window <buf>
> t) is a better test.
>
> Sometimes, testing (listp buffer-undo-list) may also be a good idea.
Thanks for the extra info!
Best regards,
Seb
--
Sebastien Vauban
- How to know is a buffer is a temporary one?, Sebastien Vauban, 2013/07/29
- Re: How to know is a buffer is a temporary one?, Thorsten Jolitz, 2013/07/29
- Re: How to know is a buffer is a temporary one?, Stefan Monnier, 2013/07/29
- Message not available
- Re: How to know is a buffer is a temporary one?, Sebastien Vauban, 2013/07/29
- Re: How to know is a buffer is a temporary one?, Sebastien Vauban, 2013/07/29
- RE: How to know is a buffer is a temporary one?, Drew Adams, 2013/07/29
- Re: How to know is a buffer is a temporary one?, Stefan Monnier, 2013/07/29
- Message not available
- Re: How to know is a buffer is a temporary one?,
Sebastien Vauban <=
- Re: How to know is a buffer is a temporary one?, Stefan Monnier, 2013/07/30
- Message not available
- Re: How to know is a buffer is a temporary one?, Sebastien Vauban, 2013/07/30