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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: Mon, 29 Jul 2013 22:06:58 +0200
User-agent: Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.3.50 (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:

--8<---------------cut here---------------start------------->8---
(setq i 0)

;; 1.19 s on i7 on mains
;; (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)))

;; 1.14 s on i7 on mains
(while (< i 1000)
  (message "%s" i)
  (if (string-match "^ \*" (buffer-name))
      (message "this is a temp buffer")
    (message "this is not a temp buffer"))
  (setq i (+ i 1)))
--8<---------------cut here---------------end--------------->8---

Best regards,
  Seb

-- 
Sebastien Vauban



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