emacs-orgmode@gnu.org archives
 help / color / mirror / code / Atom feed
From: Thorsten <quintfall@googlemail.com>
To: emacs-orgmode@gnu.org
Subject: Re: [babel] What is `, (backquote comma)?
Date: Wed, 21 Sep 2011 21:05:12 +0200	[thread overview]
Message-ID: <86obydvhqv.fsf@googlemail.com> (raw)
In-Reply-To: 871uv9hgxx.fsf@gmail.com

Štěpán Němec <stepnem@gmail.com> writes:

> On Wed, 21 Sep 2011 19:37:42 +0200
> Thorsten wrote:
>
>> in org-babel-expand-body:scheme (and
>> e.g. org-babel-expand-body:emacs-lisp) I encounter something like this:
>>
>> (lambda (var)  (format "%S" (print `(,(car var) ',(cdr var)))))
>> 	
>> While this part
>> `(,(car var) ...)
>> is explained in the manual (backquote and unquote), this part
>> `(... ',(cdr var))
>> is a bit mysterious to me, and I do not find information about
>> backquote( ... backquote comma ())
>> in the manuals or the web.
>>
>> Is that Emacs Lisp? What does that mean?
>
> Note it's not "`,", which would indeed be a no-op, but "',", which here
> means "evaluate the form after "," and quote the result", IOW, the "'"
> is just left there (for the same reason you also get to see the even
> more funny-looking "`'," and other variations sometimes). Really nothing
> new if you've read the backquote section of the Elisp manual.

thanks Nick and Stepan, 

"evaluate the form after "," and quote the result"

that made me understand what its all about. 
I just read the backquote section Elisp manual, it does not cover these
strange combiniations of barely distinguable characters, but I may haved
missed it - its a thick book. 

Cheers
Thorsten

  reply	other threads:[~2011-09-21 19:05 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-21 17:37 [babel] What is `, (backquote comma)? Thorsten
2011-09-21 18:42 ` Nick Dokos
2011-09-21 18:45 ` Nick Dokos
2011-09-21 18:46 ` Štěpán Němec
2011-09-21 19:05   ` Thorsten [this message]
2011-09-21 19:26     ` Štěpán Němec
2011-09-22  2:53       ` Jude DaShiell
2011-09-21 19:48     ` Jambunathan K
2011-09-21 22:02       ` Thorsten
2011-09-22  7:10       ` peter.frings

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

  List information: https://www.orgmode.org/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=86obydvhqv.fsf@googlemail.com \
    --to=quintfall@googlemail.com \
    --cc=emacs-orgmode@gnu.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.
Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

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 read-only IMAP folder(s) and NNTP newsgroup(s).