left padding added each time a code block is edited

left padding added each time a code block is edited

[Noah Hoffman]

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Hello,

Each time I edit a code block using =C-c '= (org-edit-special) and then
return to the org-mode buffer, two spaces are added to the left margin of
the code. For example,

#+BEGIN_SRC python
print "hello"
#+END_SRC

becomes

#+BEGIN_SRC python
  print "hello"
#+END_SRC

after one round-trip. This is particularly problematic for python code
blocks since leading whitespace is meaningful.

This is behavior that has been present in org-mode for so long that I
suspect that it's not a bug - but I'd love to know how to disable it.

Thanks a lot,
Noah

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Re: left padding added each time a code block is edited

[Thorsten Jolitz]

Noah Hoffman <noah.hoffman@gmail.com> writes:

Hello,

> Each time I edit a code block using =C-c '= (org-edit-special) and
> then return to the org-mode buffer, two spaces are added to the left
> margin of the code. For example,
>
> #+BEGIN_SRC python
> print "hello"
> #+END_SRC
>
> becomes
>
> #+BEGIN_SRC python
> print "hello"
> #+END_SRC
>
> after one round-trip. This is particularly problematic for python code
> blocks since leading whitespace is meaningful.
>
> This is behavior that has been present in org-mode for so long that I
> suspect that it's not a bug - but I'd love to know how to disable it.

At the risk of being critizised by this mailing-list's QC department I
give you this (unedited) hint:

,----[ C-h v org-edit-src-content-indentation RET ]
| org-edit-src-content-indentation is a variable defined in `org-src.el'.
| Its value is 2
| 
| Documentation:
| 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.
`----

-- 
cheers,
Thorsten

Fwd: left padding added each time a code block is edited

[Noah Hoffman]

Noah Hoffman <noah.hoffman@gmail.com> writes:

Hello,

> Each time I edit a code block using =C-c '= (org-edit-special) and
> then return to the org-mode buffer, two spaces are added to the left
> margin of the code. For example,
>
> #+BEGIN_SRC python
> print "hello"
> #+END_SRC
>
> becomes
>
> #+BEGIN_SRC python
> print "hello"
> #+END_SRC
>
> after one round-trip. This is particularly problematic for python code
> blocks since leading whitespace is meaningful.
>
> This is behavior that has been present in org-mode for so long that I
> suspect that it's not a bug - but I'd love to know how to disable it.

At the risk of being critizised by this mailing-list's QC department I
give you this (unedited) hint:

,----[ C-h v org-edit-src-content-indentation RET ]
| org-edit-src-content-indentation is a variable defined in `org-src.el'.
| Its value is 2
|
| Documentation:
| 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.
`----

--
cheers,
Thorsten

Thanks a lot, Thorsten - that's perfect. If I may provide some
suggestions/feedback to the list:

1. A more sensible value for this variable in python code blocks in
particular would be 0 if language-specific defaults are possible
(though I'll be setting my default to 0 for all languages).
2. While this variable is very well documented, it isn't very
discoverable via apropos or the html manual (at least, I wasn't able
to discover it). Perhaps a reference can be added to this variable in
the docstring for org-edit-src-code?

Best,
Noah

Re: left padding added each time a code block is edited

[Rasmus]

Hi Noah,

Noah Hoffman <noah.hoffman@gmail.com> writes:

> Noah Hoffman <noah.hoffman@gmail.com> writes:
>
>> Each time I edit a code block using =C-c '= (org-edit-special) and
>> then return to the org-mode buffer, two spaces are added to the left
>> margin of the code. For example,
>>
>> #+BEGIN_SRC python
>> print "hello"
>> #+END_SRC
>>
>> becomes
>>
>> #+BEGIN_SRC python
>>   print "hello"
>> #+END_SRC
>>
>> after one round-trip. This is particularly problematic for python code
>> blocks since leading whitespace is meaningful.

Have you experienced any bugs with respect to this? On my system Babel
will even run this code correctly:

#+BEGIN_SRC python
           if True:
               return( "hello!")
#+END_SRC

#+RESULTS:
: hello!


> 2. While this variable is very well documented, it isn't very
> discoverable via apropos or the html manual (at least, I wasn't able
> to discover it). Perhaps a reference can be added to this variable in
> the docstring for org-edit-src-code?

Patches are more than welcome!  There's a guide on Worg:

        http://orgmode.org/worg/org-contribute.html

Cheers,
Rasmus

-- 
A page of history is worth a volume of logic

Re: left padding added each time a code block is edited

[Noah Hoffman]

On Fri, Aug 8, 2014 at 6:47 AM, Rasmus <rasmus@gmx.us> wrote:

> Have you experienced any bugs with respect to this? On my system Babel
> will even run this code correctly:
>
> #+BEGIN_SRC python
>            if True:
>                return( "hello!")
> #+END_SRC
>
> #+RESULTS:
> : hello!
>
>

To use a slightly different example:

#+BEGIN_SRC python
  import sys
  for i in range(10):
      print "foo"
#+END_SRC

-*- mode: compilation; default-directory: "~/Downloads/" -*-
Compilation started at Fri Aug  8 08:44:39

~/.emacs.d/bin/pychecker /Users/nhoffman/Downloads/broken.py
/Users/nhoffman/Downloads/broken.py:1:2: unexpected indent
  import sys
 ^
/Users/nhoffman/Downloads/broken.py:1:3: E111 indentation is not a
multiple of four
/Users/nhoffman/Downloads/broken.py:1:3: E113 unexpected indentation
/Users/nhoffman/Downloads/broken.py:2:3: E111 indentation is not a
multiple of four
/Users/nhoffman/Downloads/broken.py:3:7: E111 indentation is not a
multiple of four

Compilation finished at Fri Aug  8 08:44:40

Anything other than 4 spaces per indention level is flagged by python
style/syntax checkers that enforce pep8 (and yes, many flame wars have
been fought on the topic, but there are good reasons for enforcing
consistency). This is an issue when editing code blocks and in tangled
code. Maybe it's primarily an aesthetic thing, but I think that it's
best when possible to set the default to follow the standard
conventions for the language (my python mode certainly seems to think
so!).

>> 2. While this variable is very well documented, it isn't very
>> discoverable via apropos or the html manual (at least, I wasn't able
>> to discover it). Perhaps a reference can be added to this variable in
>> the docstring for org-edit-src-code?
>
> Patches are more than welcome!  There's a guide on Worg:
>
>         http://orgmode.org/worg/org-contribute.html

I'll do so with pleasure! Thanks again.

Re: left padding added each time a code block is edited

[Achim Gratz]

Noah Hoffman writes:
> This is particularly problematic for python code
> blocks since leading whitespace is meaningful.

The problem you imagine doesn't exist because the leading whitespace is
stripped before the code is sent to the interpreter.


Regards,
Achim.
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