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Re: Confused about source code blocks evaluation when exporting

From: Alain . Cochard
Subject: Re: Confused about source code blocks evaluation when exporting
Date: Tue, 12 Jul 2022 23:13:49 +0200

Fraga, Eric writes on Tue 12 Jul 2022 14:08:

 > On Tuesday, 12 Jul 2022 at 14:53, Alain.Cochard@unistra.fr wrote:
 > > So far so good.  (Well almost: why does '#+RESULTS:' show 'bar' and
 > > not 'foo'?  After all, I'm just setting 'my-var', I'm not asking to
 > > display its value.  But that's incidental.)
 > It's not incidental.  By default, the results of a src block evaluation
 > is the value of the src block which is typically the value returned by
 > the last statement.

I guess I didn't use 'incidental' correctly.  I meant it as "not my
main concern".  Anyway, thank you; I could check that if I switch the
2 lines I indeed get '#+RESULTS:' to show foo'.

 > You can modify this by adding
 > :results output
 > for instance to the begin_src line.
 > > (test 2) Same org file.  If I do 'C-c C-e l o', no question is asked,
 > > no '#+RESULTS:' block is inserted, and the resulting pdf file shows:
 > On export, the default is to export the code.  If you want the results,
 > you need to add
 > :exports results
 > or if you want both code and results,
 > :exports both

Greg Minshall writes on Tue 12 Jul 2022 17:22:

 > maybe look in the org manual for ":results" (with "value" or
 > "output" as options) and ":exports" (with "code" or "results" or
 > "both" as options).

Thank you both, I made progress; but the behavior is still very so
unintuitive to me.  For example, I haven't found a way to have this

#+begin_src emacs-lisp <arguments to be determined>
  (message "foo")
  (message "bar")

and have the following inserted during export:

: foo
: bar

(after all, that is was goes into the *Messages* buffer upon
evaluation with 'C-c C-c'...)

Finally I still tend to consider that the sentence "Org evaluates
source code blocks in an Org file during export" is confusing.  But
maybe that's just I who interpret this as "code evaluation is the
default behavior upon export".


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