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Re: Counting SLOC in Emacs
From: |
Marcin Borkowski |
Subject: |
Re: Counting SLOC in Emacs |
Date: |
Fri, 28 Nov 2014 17:00:42 +0100 |
On 2014-11-28, at 15:49, Stefan Monnier wrote:
>>> And don't re-call use-region-p here, in the off-chance that it returns
>>> something else than in the first call. E.g. you can use (if (and (=
>>> beg (point-min)) (= end (point-max))) "buffer" "region") instead.
>> I don't think it's probable (or even possible), but definitely my
>> solution was not very elegant. I wonder whether (let)ting
>> (use-region-p) to a temporary variable wouldn't be better.
>
> Yes, it should be passed as an additional argument (you could pass
> `region' or `buffer' as argument, with nil meaning "not interactive,
> just return the count without displaying a message").
>
>> Anyway, thanks for your review! I will write a blog post about this
>> function (googling for "emacs count sloc" doesn't yield anything
>> useful, let's change it! ;-) ).
>
> Of course, you'll bump into further problems:
>
> (* foo bar
> * baz *)
>
> will count as 1 lines, IIUC. And similarly
>
> printf ("toto\n"); (* foo bar
> * baz *)
>
> will count as 2 lines. You might want to try something like:
Hm. Didn't think of this. (I'm not really accustomed to multi-line
comments, I guess.)
> (defun count-sloc-region (beg end kind)
> "Count source lines of code in region (or (narrowed part of)
> the buffer when no region is active). SLOC means that empty
> lines and comment-only lines are not taken into consideration."
> (interactive
> (if (use-region-p)
> (list (region-beginning) (region-end) 'region)
> (list (point-min) (point-max) 'buffer)))
> (save-excursion
> (goto-char beg
> (let ((count 0))
> (while (< (point) end)
> (cond
> ((nth 4 (syntax-ppss)) ;; BOL is already inside a comment.
> (let ((pos (point)))
> (goto-char (nth 8 (syntax-ppss)))
> (forward-comment (point-max))
> (if (< (point) pos) (goto-char pos)))) ;; Just paranoia.
> (t (forward-comment (point-max))))
> (setq count (1+ count))
> (forward-line))
> (when kind
> (message "SLOC in %s: %s." kind count))))))
Wow, thanks!
I'm planning to run a code reading seminar for some ambitious students
at my faculty. I'm wondering whether it could be a good idea to study
this;).
(In fact, not really - at least not in the beginning - let them learn
some more typical stuff before exposing young minds to Emacs Lisp with
its peculiarities, like `interactive'. We'll start with Python and JS,
though some Common Lisp is also planned.)
> -- Stefan
Best,
--
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University
- Counting SLOC in Emacs, Marcin Borkowski, 2014/11/28
- Re: Counting SLOC in Emacs, Marcin Borkowski, 2014/11/28
- Re: Counting SLOC in Emacs, Stefan Monnier, 2014/11/28
- Re: Counting SLOC in Emacs, Marcin Borkowski, 2014/11/28
- Re: Counting SLOC in Emacs, Stefan Monnier, 2014/11/28
- Re: Counting SLOC in Emacs,
Marcin Borkowski <=
- Re: Counting SLOC in Emacs, Thien-Thi Nguyen, 2014/11/29
- Re: Counting SLOC in Emacs, Marcin Borkowski, 2014/11/29
- Re: Counting SLOC in Emacs, Grant Rettke, 2014/11/29
Re: Counting SLOC in Emacs, Phillip Lord, 2014/11/28