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Re: default :results
From: |
Bastien |
Subject: |
Re: default :results |
Date: |
Wed, 11 Nov 2020 09:03:56 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Hi Ian,
ian martins <ianxm@jhu.edu> writes:
> The doc says functional mode (=:results value=) is the default for
> most Babel libraries [1]. I haven't looked at many, but it is the
> default for ob-python and ob-shell. Scripting mode (=:results output
> =) is the default for ob-C, and the old ob-java (neither of these
> provided a functional mode).
>
> When I added functional mode to ob-java, I made it the default since
> that seemed correct. But that change breaks anyone that relied on
> the old default (the workaround is to add a =:results output=
> header). I will change the default in the short term to unbreak the
> experience, but what, if anything, should be done long term?
The default for ob-shell execution was to use the output, not the
value. Then we had a long discussion, leading to this:
- The default (no :result) is to display the functional value
- For some languages, it may break expectations, so in this case we
allow a variable that let the default (no :result) use the output
instead of the functional value.
This is what is being done for ob-shell.el where we have
`org-babel-shell-results-defaults-to-output' set to `t'.
See https://orgmode.org/list/877dt5trjr.fsf@bzg.fr/ for the conclusion
of the discussion.
Also see `org-babel-shell-results-defaults-to-output' docstring:
Let shell execution defaults to ":results output".
When set to t, use ":results output" when no :results setting
is set. This is especially useful for inline source blocks.
When set to nil, stick to the convention of using :results value
as the default setting when no :results is set, the "value" of
a shell execution being its exit code.
> And is this inconsistent behavior across languages something that
> should be fixed? or is it intentional or at least not worth doing
> anything about?
What was suggested is to have a page on Worg listing the behavior of
various packages regarding block execution.
I started a section on https://orgmode.org/worg/library-of-babel.html
with a table -- feel free to add more to this table.
Thanks,
--
Bastien
- Re: default :results,
Bastien <=