Re: get name of source block

[Andreas Leha <andreas.leha@med.uni-goettingen.de>]

Hi Sebastien,

Sebastien Vauban <sva-news@mygooglest.com> writes:
> Andreas Leha wrote:
>> for quite some time I've had the following in my .emacs:
>>
>> ;; This Snippet returns the name of the current source block.
>> ;; An elisp block to simplify the =:prologue= definition.
>> ;; Author: Eric Schulte
>> ;; It is useful to insert the debug message 'Entering foo()' as output.
>> ;; For R code blocks, enable it with this line:
>> ;; #+PROPERTY: header-args:R :session *R* :prologue (format "print(\"entering %s\")" (get-current-name))
>> (defun get-current-name ()
>>   (or (when org-babel-current-src-block-location
>>         (save-excursion
>>           (goto-char org-babel-current-src-block-location)
>>           (while (and (forward-line -1)
>>                       (looking-at org-babel-multi-line-header-regexp)))
>>           (when (looking-at org-babel-src-name-w-name-regexp)
>>             (org-no-properties (match-string 3)))))
>>       ""))
>>
>> That had stopped working during export (my main use-case) a few weeks
>> back.  Now, org-babel-src-name-w-name-regexp is gone from the source
>> so that this snippet is completely broken.
>>
>> I would like to again have the name of the source block displayed
>> during execution of src blocks.  Is there a function in org already?
>> And if not, how would the proposed function look like so that it works
>> during export as well?
>
> Seems to come from:
>
> * 49a656a ob-core: Remove `org-babel-src-name-w-name-regexp' <Nicolas Goaziou> (2015-05-01)
> * cec47a6 ob-core: Change `org-babel-named-src-block-regexp-for-name' signature <Nicolas Goaziou> (2015-05-01)
>
> Maybe looking at the diff would give you the way to translate the regexp
> into some newer form?
>
> Best regards,
>   Seb



Yes, I was lazy and following the change to
`org-babel-named-src-block-regexp-for-name' is easy enough.
But how does that solve my first problem?

During export (and preview (C-c C-v v)) the code block name is not
displayed.

Here is an expample:

--8<---------------cut here---------------start------------->8---
#+PROPERTY: header-args:R :session *testR* :prologue (format "print(\"entering %s\")" (get-current-name))

* Setup								   :noexport:
#+begin_src emacs-lisp :results none
  (defun get-current-name ()
    (or (when org-babel-current-src-block-location
          (save-excursion
            (goto-char org-babel-current-src-block-location)
            (while (and (forward-line -1)
                        (looking-at org-babel-multi-line-header-regexp)))
            (when (looking-at (org-babel-named-src-block-regexp-for-name))
              (org-match-string-no-properties 9))))
        ""))
  (message (get-current-name))
#+end_src


* Test echo name during export

Execute this source block (C-c C-c) and look into *testR*.  There
should be a message "entering testname".

Export this file and look into *testR*.  The message is "entering ".

#+name: testname
#+begin_src R
  1:10
#+end_src
--8<---------------cut here---------------end--------------->8---


Thanks,
Andreas