From: Uwe Brauer <oub@mat.ucm.es>
To: ding@gnus.org
Subject: [misunderstanding] (was: for a given emacs session: insert a subject with an increasing counter)
Date: Sat, 04 Sep 2021 17:30:42 +0200 [thread overview]
Message-ID: <87r1e473z1.fsf_-_@mat.ucm.es> (raw)
In-Reply-To: <87bl5dbof1.fsf@tullinup.koldfront.dk>
[-- Attachment #1: Type: text/plain, Size: 1357 bytes --]
> Uwe writes:
> Ah, yes, but setq doesn't define a quantity - it is much less abstract:
> it assigns a value to a variable.
> Thanks for explaining, I was genuinely puzzled; you are using a
> different definition of recursion than most people do, when it comes to
> programming - where it is usually, implicitly about functions.
I realised that there was a misunderstanding. I thought you and others
suggest just to use
(defun my-new-insert-subject-counter-old ()
"Insert a string of the form [`counter/Total'] "
(interactive)
(save-excursion
(setq my-subject-counter (+ my-subject-counter 1))
(let ((total (read-string "Total number: " )))
(message-carefully-insert-headers (list (cons 'Subject (format "[%s/%s]" my-subject-counter total)))))))
Without
(defvar my-subject-counter 0) (or something like this.)
As a matter of fact I deleted the defvar definition from my code and it
still worked[1] but which puzzled me.
So I thought
(setq my-subject-counter (+ my-subject-counter 1))
defines and sets the variable in a recursive way, but it does not. You
need a defvar (or a surrounding let).
I only discovered my error misunderstanding when I restarted emacs and
the code did not work anymore
Sorry for the misunderstanding.
Footnotes:
[1] because it was already defined
[-- Attachment #2: smime.p7s --]
[-- Type: application/pkcs7-signature, Size: 5673 bytes --]
next prev parent reply other threads:[~2021-09-04 15:35 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-30 16:01 for a given emacs session: insert a subject with an increasing counter Uwe Brauer
2021-08-30 16:10 ` Eric S Fraga
2021-08-30 18:46 ` Eric Abrahamsen
2021-08-31 6:50 ` Uwe Brauer
2021-08-31 6:58 ` Adam Sjøgren
2021-08-31 15:42 ` Uwe Brauer
2021-08-31 15:54 ` Adam Sjøgren
2021-09-02 8:15 ` Uwe Brauer
2021-09-04 15:30 ` Uwe Brauer [this message]
2021-09-07 20:04 ` [misunderstanding] (was: for a given emacs session: insert a subject with an increasing counter) Emanuel Berg
2021-09-01 3:55 ` for a given emacs session: insert a subject with an increasing counter Bodertz
2021-09-04 15:25 ` Uwe Brauer
2021-09-07 17:12 ` Emanuel Berg
2021-09-07 19:02 ` Eric Abrahamsen
2021-09-07 19:25 ` Emanuel Berg
2021-09-07 20:09 ` Emanuel Berg
2021-09-07 20:35 ` Emanuel Berg
2021-09-07 20:44 ` Eric Abrahamsen
2021-09-21 3:32 ` Emanuel Berg
2021-09-21 19:12 ` Bodertz
2021-09-21 21:56 ` Emanuel Berg
2021-08-31 7:44 ` Emanuel Berg
2021-08-31 7:56 ` Emanuel Berg
2021-08-31 16:01 ` Uwe Brauer
2021-08-31 16:29 ` Eric Abrahamsen
2021-08-31 19:06 ` Uwe Brauer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87r1e473z1.fsf_-_@mat.ucm.es \
--to=oub@mat.ucm.es \
--cc=ding@gnus.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).