Re: [O] Regression bug in tangle/weave

[Eric Schulte]

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 <address@hidden> 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 <address@hidden>
> To: MidLifeXis at PerlMonks <address@hidden>
> Cc: emacs-orgmode <address@hidden>
> 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 <address@hidden> 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/