Re: [Babel] Padlines

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

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"Sebastien Vauban" <sva-news@mygooglest.com> writes:

> Hi Eric,
>
> Eric Schulte wrote:
>> aditya siram <aditya.siram@gmail.com> writes:
>>> What's the rationale for having padlines by default in tangled source? It
>>> generates wrong programs for languages where whitespace is significant
>>> (Haskell) and, for me, doesn't noticeably improve the look of the tangled
>>> file in cases where it isn't.
>>
>> It is possible to change the value of default header arguments on a
>> per-language basis because e.g., while (:padlines "yes") may make sense
>> for sh, it probably doesn't for Haskell.
>
> Could it be possible that ":padline yes" does not insert a blank line in front
> of the very first block, only *between* all blocks?
>
> Best regards,
>   Seb

I just pushed up a commit which implements this behavior.  See the
attached file for an example.


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#+Title: Examples with the new padline behavior

#+headers: :tangle pad-yes-with-shebang.sed
#+headers: :shebang "#!/bin/sed -f" 
#+headers: :padline "yes"
#+begin_src sed
  1 {N;s/\n//1}
#+end_src

#+headers: :tangle pad-no-with-shebang.sed
#+headers: :shebang "#!/bin/sed -f"
#+headers: :padline "no"
#+begin_src sed
  1 {N;s/\n//1}
#+end_src

#+headers: :tangle pad-yes-without-shebang.sed
#+headers: :padline "yes"
#+begin_src sed
  1 {N;s/\n//1}
#+end_src

#+headers: :tangle pad-no-without-shebang.sed
#+headers: :padline "no"
#+begin_src sed
  1 {N;s/\n//1}
#+end_src

1. Tangle the above four blocks with =C-c C-v t=.
2. Execute the following code block to view the contents of the
   resulting sed files.

#+begin_src sh :results scalar
  head pad*sed
#+end_src

#+RESULTS:
: ==> padline-example.sed <==
: #!/bin/sed -f
: 
: 1 {N;s/\n//1}
: 
: ==> pad-no-without-shebang.sed <==
: 1 {N;s/\n//1}
: 
: ==> pad-no-with-shebang.sed <==
: #!/bin/sed -f
: 1 {N;s/\n//1}
: 
: ==> pad-yes-without-shebang.sed <==
: 1 {N;s/\n//1}
: 
: ==> pad-yes-with-shebang.sed <==
: #!/bin/sed -f
: 
: 1 {N;s/\n//1}

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-- 
Eric Schulte
https://cs.unm.edu/~eschulte
PGP: 0x614CA05D