GNU bug report logs - #79147
Tangling source blocks with variables using drawer output includes unwanted new line in variable definition

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From: Vincent Koppelmans <vincentkoppelmans <at> gmail.com>
To: 79147 <at> debbugs.gnu.org
Subject: bug#79147: Tangling source blocks with variables using drawer output includes unwanted new line in variable definition
Date: Fri, 01 Aug 2025 12:14:10 -0600

Tangling a source block that contains a variable from another source block results in an additional incorrect new line at the end of the variable value in the tangled output file, /only/ when source block output type is set to 'drawer'.

Here is a minimal example comparing regular source block output (correct) versus drawer output (error), tested with emacs -Q, GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, cairo version 1.16.0) of 2025-05-27 and Org 9.7.11:

* Allow org blocks to evaluate shell code
#+begin_src elisp :tangle no :results output none
(org-babel-do-load-languages
 'org-babel-load-languages
 '((shell . t)))
#+end_src

* Tangle code block with variable input from other source block
** Using regular source block output
*** Source block that generates the variable
#+name: my_temp_dir1
#+begin_src bash :tangle no
echo "/example/path"
#+end_src

#+RESULTS: my_temp_dir1
: /example/path

*** Source block that takes in the variable and which gets tangled
#+begin_src sh :var idir=my_temp_dir1 :tangle test_default.sh
echo "${idir}"
#+end_src

*** Display the tangled block
#+begin_src sh :tangle no :results output drawer
cat test_default.sh
#+end_src

#+RESULTS:
:results:
idir='/example/path'
echo "${idir}"
:end:

Looks okay!

** Using drawer source block output
*** Source block that generates the variable
#+name: my_temp_dir2
#+begin_src bash :tangle no :results output drawer
echo "/example/path"
#+end_src

#+RESULTS: my_temp_dir2
:results:
/example/path
:end:

*** Source block that takes in the variable and which gets tangled
#+begin_src sh :var idir=my_temp_dir2 :tangle test_drawer.sh
echo "${idir}"
#+end_src

*** Display the tangled block
#+begin_src sh :tangle no :results output drawer
cat test_drawer.sh
#+end_src

#+RESULTS:
:results:
idir='/example/path
'
echo "${idir}"
:end:

We have a problem: the closing quote starts on a new line.

Best,

Vincent

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