Re: Behavior of Org mode Babel code snippets with respect to M-q (fill-paragraph) and C-/ (undo)

[Omid <omidlink@gmail.com>]

Hello Nick,

Thanks for your quick reply. The variable
org-edit-src-content-indentation does indeed have to do with the
indentation I was referring to. But it is relative. According to the
documentation, it sets the "Indentation for the content of a source
code block. This should be the number of spaces added to the
indentation of the #+begin line in order to compute the indentation of
the block content after editing it with M-x org-edit-src-code. Has no
effect if `org-src-preserve-indentation' is non-nil." I wonder if one
can set it to be zero as an absolute value, meaning that if the a line
of code in the source block starts at column n of the buffer, it is
left at column n after M-q.

Regarding the behavior you observe, as I said I get that too from time
to time. In fact, doing M-q on my own example in a fresh Org mode
buffer, I now get what you get:

  #+BEGIN_SRC f90 :results verbatim :exports both
  program main ! This is a very very very very very very very very very
  very very very very very very very long comment line. print *, "Hello,
  World!" end program main
  #+END_SRC

I don't have any special settings for the f90 mode in my .emacs. In
fact, I have observed the same behavior for other languages too when
edited in an Org source block. The "destructive" nature of this
behavior is very special (C-/ (undo) doesn't work). Many a times, I
have tried refilling a line of comments and ended up with a huge mix
of code and comment that was impossible to undo (at least to the best
of my knowledge) and I had to either revert the change if I had the
file under version control, go to an auto backup file, or painfully and
manually separate the code and comments to get back the original code
block.

Omid


On 02/05/2014 04:34 PM, Nick Dokos wrote:
> Omid <omidlink@gmail.com> writes:
> 
>> Hello,
>>
>> I am using Org-mode version 8.2.5g (8.2.5g-elpa) in GNU Emacs 24.3.1.
>> I have two questions about the behavior of the fantastic Org
>> mode+Babel with respect to code and comments:
>>
>> Here is a minimal example:
>>
>>   #+BEGIN_SRC f90 :results verbatim :exports both
>> program main
>> ! This is a very very very very very very very very very very very very
>> very very very very long comment line.
>> print *, "Hello, World!"
>> end program main
>>   #+END_SRC
>>
>> Below is the code snippet after M-q (fill-paragraph) on the comment
>> line. The comment line has been refilled (intended behavior) but all
>> lines have been indented. This may also be an intended behavior; but
>>
>> FIRST QUESTION: Is there a way to disable this indentation upon M-Q in
>> Org Babel code snippets?
>>
> 
> Try setting org-edit-src-content-indentation to 0. I'm not sure that
> it is going to work, but (based on rather flimsy numerological evidence,
> namely that its default value is 2 as is the indent below) it might.
> 
>>   #+BEGIN_SRC f90 :results verbatim :exports both
>>     program main
>>     ! This is a very very very very very very very very very very very very
>>     ! very very very very long comment line.
>>     print *, "Hello, World!"
>>     end program main
>>   #+END_SRC
>>
> 
> BTW, I don't get this behavior but I don't use f90 mode, so I'm not sure
> whether there is some setup I'm missing. I get (with
> org-edit-src-content-indentation set to 0):
> 
>   #+BEGIN_SRC f90 :results verbatim :exports both
>   program main ! This is a very very very very very very very very very
>   very very very very very very very long comment line.  print *,
>   "Hello, World!"  end program main
>   #+END_SRC
> 
> Nick
> 
> 
>