Re: Regression bug in tangle/weave

[Eric Schulte <schulte.eric@gmail.com>]

I normally keep `org-confirm-babel-evaluate' set to nil but to test the
below I set it to t and was not prompted for evaluation.

Do you have a code block named "file-version" in this file?  If so then
either that code block, or the results line will need to be renamed.
When Org-mode finds both a code block _and_ a results line of the same
name it defaults to evaluating the code block in case the results are
stale.

Cheers -- Eric

MidLifeXis at PerlMonks <midlifexis@wightmanfam.org> writes:

> I am still getting prompted with the 'Evaluate this text code block (file-version) on your system?' message.
>
> What is your value of org-confirm-babel-evaluate set to?  Mine is set
> as the default, 't.  According to the docs, this is the more secure
> setting.
>
>
> I updated no more than two weeks ago.  I will refresh my org-mode setup over the weekend and see if that takes care of it.
>
> Brian
>
>
>
> ----- Original Message -----
> From: Eric Schulte <schulte.eric@gmail.com>
> To: MidLifeXis at PerlMonks <midlifexis@wightmanfam.org>
> Cc: emacs-orgmode <emacs-orgmode@gnu.org>
> Sent: Friday, July 1, 2011 2:14 PM
> Subject: Re: [O] Regression bug in tangle/weave
>
> Yes, the second example I gave (shown immediately below) requires no
> execution of code.
>
>     #+begin_src text :tangle yes
>       <<file-version()>>.
>     #+end_src
>
>     #+results: file-version
>     : 1.2.3.4
>
> Best -- Eric
>
> MidLifeXis at PerlMonks <midlifexis@wightmanfam.org> writes:
>
>> Is there an example of this that does not use something like elisp,
>> R, perl, python, shell, or some other process that requires either
>> allowing all blocks to execute without prompting, or prompting for
>> authority to run the block every time the file is tangled?
>>
>> Brian
>>
>>
>>
>> ----- Original Message -----
>> From: Eric Schulte <schulte.eric@gmail.com>
>> To: MidLifeXis at PerlMonks <midlifexis@wightmanfam.org>
>> Cc: emacs-orgmode <emacs-orgmode@gnu.org>
>> Sent: Thursday, June 30, 2011 1:30 PM
>> Subject: Re: [O] Regression bug in tangle/weave
>>
>> Hi,
>>
>> Indeed this example below no longer works, however I believe the new
>> behavior is both desired and permanent.  I'll explain and include an
>> option for how your example could be restructured to work with the new
>> code.
>>
>> We ran into problems automatically removing trailing newlines from code
>> block bodies as in some languages (looking at you Python and Haskell)
>> things like trailing newlines are of syntactic importance.  In your
>> example this behavior results in the insertion of newlines after
>> file-name and file-version.  Babel is careful to preserve line prefixes
>> when expanding references in comments, so it then reproduces the
>>
>>   # Generated from 
>>
>> portion of that line for every line of the expanded noweb references.
>>
>> I would suggest the following alternatives, either using a data
>> references in stead of a code block reference as in the file-version
>> example below, or using an evaluated code block as in the file-name
>> example below.  Hope this helps.
>>
>> Best -- Eric
>>
>>
>>
>> MidLifeXis at PerlMonks <midlifexis@wightmanfam.org> writes:
>>
>>> It appears that there may be a regression problem with the current
>>> tangle/weave process.  I used to be able to have a noweb section for
>>> the name of the file, another for the version of the file, and then
>>> have an autogenerated header section that included those two pieces of
>>> information on a single line.  Following is an org file snippet of my
>>> bug description.
>>>
>>>
>>> * Bugs
>>> ** SOMEDAY org-mode bug with tangle and newlines      :BUG:
>>>    :PROPERTIES:
>>>    :created: [2011-06-30 Thu 10:00]
>>>    :ID: e4c992b5-4d35-443b-b34a-0fbda7c66aea
>>>    :END:
>>>    :LOGBOOK:
>>>    - Added on [2011-06-30 Thu 10:00]
>>>    :END:
>>>    [2011-06-30 Thu]
>>>
>>>    A regression bug has surfaced in org-mode with the tangle/weave
>>>    process mangling the following setup:
>>>
>>>    #+begin_src perl :noweb yes :tangle testoutput.pl :shebang #!perl
>>>    # <<generated-from>>
>>>    print "Hello world\n";
>>>    #+end_src
>>>
>>>    #+srcname: generated-from
>>>    #+begin_src text :noweb yes
>>>    Generated from <<file-name>> version <<file-version>>.
>>>    #+end_src
>>>
>>>    #+srcname: file-name
>>>    #+begin_src text :noweb yes
>>>    ATestFile.org
>>>    #+end_src
>>>
>>>    #+srcname: file-version
>>>    #+begin_src text :noweb yes
>>>    1.2.3.4
>>>    #+end_src
>>>
>>>    The last it worked* was sometime in the early 7.4 timeframe.  If I
>>>    get some time, I may do a bisect on it, although others are welcome
>>>    to do the work required.  Timeframe is based on memory, not
>>>    actual checking, so first a bisect needs to be done to find where
>>>    it last worked.
>>>
>>>
>>> *** Actual output
>>>
>>> #+begin_src perl
>>> #!perl
>>>
>>> # Generated from ATestFile.org
>>> # Generated from version 1.2.3.4
>>> # Generated from <<file-name>> version .
>>> # 
>>> print "Hello world\n";
>>> #+end_src
>>>
>>> *** Expected output (or at least similar)
>>>
>>> #+begin_src perl
>>> #!perl
>>>
>>> # Generated from ATestFile.org version 1.2.3.4.
>>>
>>> print "Hello world\n";
>>> #+end_src
>>>
>>> * End of org file
>>>
>>>

-- 
Eric Schulte
http://cs.unm.edu/~eschulte/