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[O] Modify a variable before it is passed to babel (or exported)?
From: |
Ken Mankoff |
Subject: |
[O] Modify a variable before it is passed to babel (or exported)? |
Date: |
Mon, 16 Sep 2019 10:21:41 -0700 |
User-agent: |
mu4e 0.9.18; emacs 26.2 |
I'd like to modify a variable with a babel block before another block sees the
variable. For example, I always want to add one to a variable:
#+NAME: add-one
#+BEGIN_SRC bash :results verbatim :var data=0
data=$(( data + 1 ))
echo $data
#+END_SRC
#+RESULTS: add_one
: 1
Test it:
#+CALL: add_one(data=42)
#+RESULTS:
: 43
Can I use =add_one= to modify data passed elsewhere?
For example, given
#+NAME: table
| 42 |
I'm having trouble defining a =print_table= function that prints 43, using the
=add_one= either via :prologue or <<noweb>> or some other method. Preferably
prologue because then the add_one function could be in a different language.
I can get halfway to what I want with a :post option, but need this to be a
:pre or :prologue. Example using :post
#+NAME: python_using_add_one
#+BEGIN_SRC python :results output values :post add-one(data=*this*)
print(42)
#+END_SRC
#+RESULTS: python_using_add_one
: 43
Any suggestions how to use this feature with :pre or :prologue?
Thanks,
-k
- [O] Modify a variable before it is passed to babel (or exported)?,
Ken Mankoff <=