Re: [Babel] [Bug] Cache

["Sebastien Vauban" <sva-news-D0wtAvR13HarG/iDocfnWg@public.gmane.org>]

Hi Eric,

Eric Schulte wrote:
> "Sebastien Vauban" <sva-news-D0wtAvR13HarG/iDocfnWg@public.gmane.org> writes:
>>
>> IIRC, some time ago, a bug involving the computation of the hash (when
>> option cache is enabled) and NoWeb code blocks. I remember that it had been
>> fixed.
>>
>> However, the following example shows it's not (true anymore):
>>
>> --8<---------------cut here---------------start------------->8---
>> #+PROPERTY: cache yes
>>
>> #+name: common-code
>> #+begin_src R :eval no
>> s <- "Hello"
>> #+end_src
>>
>> #+begin_src R :noweb yes
>> <<common-code>>
>>
>> print(s)
>> #+end_src
>>
>> #+results[f472c44e64e310a6d06544dbdfba558a709873a7]:
>> : Hello
>> --8<---------------cut here---------------end--------------->8---
>>
>> Change the "common code" block: edit "Hello", for example, and you'll see
>> that the evaluation of the other code block is not redone (like if the NoWeb
>> code was not expanded for computing the hash). It stays printing "Hello".
>
> Could you git bisect this breakage to isolate the offending commit?

I couldn't find any version where my ECM would work. Though, I was sure to have
read comments about that problem -- I never used that situation myself in the
past, so I just assumed it had been fixed in the meanwhile. It seems not.

And here the post of Achim where he explains that problem:

  ╭────
  │ From: Achim Gratz <Stromeko-i47jiTeKxPI@public.gmane.org>
  │ Subject: Re: [PATCH] * lisp/ob-core.el (org-babel-execute-src-block):
  │ 	insert hash for silent results
  │ Date: Sun, 10 Mar 2013 09:52:10 +0100 (38 weeks, 1 day, 6 hours ago)
  │
  │ [...]
  │
  │ But back to my earlier remark about the hash value actually being a
  │ signature of the source block and not the result.  If I use noweb
  │ references, the reference text is cached, not its expansion.
  ╰────

Best regards,
  Seb

-- 
Sebastien Vauban