From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Welle <mwe012008@gmx.net>
Subject: Re: Concatenating Org property values from parent subtrees
Date: Sat, 29 Sep 2018 21:23:30 +0200
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	(Kaushal Modi's message of "Sat, 29 Sep 2018 15:01:26 -0400")
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To: emacs-orgmode@gnu.org

Hello,


Kaushal Modi <kaushal.modi@gmail.com> writes:

> On Sat, Sep 29, 2018 at 2:39 PM Michael Welle <mwe012008@gmx.net> wrote:
>
>>
>> I asked something similar earlier this year (concatenating compiler
>> flags given as header-args property, used for linking against different
>> libs in different sections of the Org file). I ended with a function
>> that grabs the current property value and returns the value concatenated
>> with new value. That function can be used as a 'property value'. That's
>> not a nice and bullet proof solution, but works good enough to me to
>> generate the solutions to the psets for the lecture.
>>
>
> Please share it if you don't mind. I plan to use it or its derivative in
> ox-hugo. The property is planned to be a path property, and with nested
> property values of "a","b" and "c", which I want to parse as "a/b/c".


(defun hmw/org-prop-append(prop value)
  (save-excursion
  (org-up-heading-safe)
  (format "%s %s" value (cdr (assq prop
                                   (car (org-babel-params-from-properties)))))))

(defalias 'A 'hmw/org-prop-append)


I use it like this:


* foo
 :PROPERTIES:
 :header-args: :flags -Wall
 :END:

** bar
#+begin_src C :flags (A :flags "-lm")
#+end_src

** baz
 :PROPERTIES:
 :header-args: :flags (A :flags "-lcunit")
 :END:

#+begin_src C
#+end_src


Regards
hmw