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Re: [O] org-babel -- Improper syntax error in session mode?
From: |
Thomas S. Dye |
Subject: |
Re: [O] org-babel -- Improper syntax error in session mode? |
Date: |
Tue, 21 Jun 2011 06:27:54 -1000 |
Aloha Herb,
I think a note to that effect belongs here:
http://orgmode.org/manual/session.html#session
Perhaps the behavior related to session persistence could be described
there, as well.
Examples are probably best left to the language-specific documentation,
such as it is, at http://orgmode.org/worg/org-contrib/babel/languages/
Note that there is no language-specific documentation for Python yet.
Is it the case that the Ruby and Perl interpreters won't run code that
does run in non-session mode?
All the best,
Tom
Herbert Sitz <address@hidden> writes:
> Thomas S. Dye <tsd <at> tsdye.com> writes:
>>
>> Aloha Herbert,
>>
>> I think you're right about the potential to improve the documentation.
>> That's an on-going process. Could you suggest some specific changes?
>>
>> All the best,
>> Tom
>
> Tom --
>
> I would suggest just adding specific warnings that session-based evaluation
> may
> throw syntax errors with valid code.
>
> Here's what Org manual says regarding :session evaluation with :results
> output':
>
> "The code is passed to the interpreter running as an interactive Emacs
> inferior
> process. The result returned is the concaOrg tenation of the sequence of
> (text)
> output from the interactive interpreter. Notice that this is not necessarily
> the
> same as what would be sent to STDOUT if the same code were passed to a
> non-interactive interpreter running as an external process. . . ."
> [http://orgmode.org/manual/Results-of-evaluation.html#Results-of-evaluation]
>
> All that needs to be added is a warning:
>
> "IMPORTANT: Note that Org provides only a thin wrapper around a language's
> interactive shell, so valid code that executes properly in non-session mode
> may
> fail in :session mode. This is because Org feeds the lines in a :session
> block
> to the interactive interpreter exactly as written. In come cases the lines
> may
> require special formatting in the source block to be executed properly in the
> interactive shell. For example: . . . "
>
> I think the above issue should be moot for some of the main interpreted
> languages (viz., Python, Perl, Ruby) where there are various ways to execute a
> block of code non-interactively despite being in the interactive shell. (One
> of
> those methods is the example I gave in previous message.) In that case
> identical code will run the same whether it's in an interactive-interpreter
> session or not. It seems to me that switching to that approach for languages
> that support it should both (1) simplify the Org Babel code, and (2) provide
> Org
> users with more flexibility and power.
>
> Also, it seems the real power of :session evaluation is to share state between
> Org/Babel source code blocks, not merely to act as a kind of Org-internal
> scratchpad. As a user trying to take advantage of that state-sharing power I
> would generally want my Org document exports to start from fresh sessions.
> That
> is, I would write my :session blocks so that they depended on results of code
> run in previous :session blocks, BUT I would want the first :session block to
> start with a fresh session,with a known state. So on export I would
> generally
> want any existing named session to be closed and restarted anew for an
> Org export.
>
> I hope that all makes sense. I should say I'm not a big Babel user, and I
> could
> easily be misunderstanding something. But it seems this is the way the
> :session-based stuff should work, when possible.
>
> -- Herb
>
>
>
--
Thomas S. Dye
http://www.tsdye.com
- Re: [O] org-babel -- Improper syntax error in session mode?, (continued)
- Re: [O] org-babel -- Improper syntax error in session mode?, Herbert Sitz, 2011/06/20
- Re: [O] org-babel -- Improper syntax error in session mode?, Eric Schulte, 2011/06/20
- Re: [O] org-babel -- Improper syntax error in session mode?, Herbert Sitz, 2011/06/20
- Re: [O] org-babel -- Improper syntax error in session mode?, Nick Dokos, 2011/06/20
- Re: [O] org-babel -- Improper syntax error in session mode?, Herbert Sitz, 2011/06/21
- Re: [O] org-babel -- Improper syntax error in session mode?, Nick Dokos, 2011/06/20
- Re: [O] org-babel -- Improper syntax error in session mode?, Eric Schulte, 2011/06/20
- Re: [O] org-babel -- Improper syntax error in session mode?, Herbert Sitz, 2011/06/21
- Re: [O] org-babel -- Improper syntax error in session mode?, Thomas S. Dye, 2011/06/21
- Re: [O] org-babel -- Improper syntax error in session mode?, Herbert Sitz, 2011/06/21
- Re: [O] org-babel -- Improper syntax error in session mode?,
Thomas S. Dye <=
- Re: [O] org-babel -- Improper syntax error in session mode?, Herbert Sitz, 2011/06/21
- Re: [O] org-babel -- Improper syntax error in session mode?, Eric Schulte, 2011/06/21
- Re: [O] org-babel -- Improper syntax error in session mode?, Eric Schulte, 2011/06/21
- Re: [O] org-babel -- Improper syntax error in session mode?, Herbert Sitz, 2011/06/27
- Re: [O] org-babel -- Improper syntax error in session mode?, Eric Schulte, 2011/06/21
- Re: [O] org-babel -- Improper syntax error in session mode?, Herbert Sitz, 2011/06/27
- Re: [O] org-babel -- Improper syntax error in session mode?, Jambunathan K, 2011/06/20