Re: export code with backslashes

["Charles C. Berry" <ccberry@ucsd.edu>]

On Mon, 16 Mar 2015, hymie! wrote:

> Greetings.
>
> I'm only asking this question because it seems that Orgmode can do
> anything, although I admit that what I'm asking for is probably outside
> the normal scope.
>
> I have snips of code in my org files, denoted as ~code~.  I prefer ~code~ to
> BEGIN_SRC blocks, because I don't like the big grey text boxes in my
> exported documents.  Sometimes my code is very long and includes long lists
> of options and arguments and such; for example:
>
> ~useradd -U -G wheel -p
> '$6$wcMRrkcdGeNHLT5b$password0ISmGZSsILOyV/WJnpassword//'
> accountname~
>
> This is all one line.
>
> Then I use C-c C-e t A to "export" this into an ascii buffer, the sole
> reason being to remove the tilde characters and provide me an easy
> cut-n-paste option.   I end up with this:
>
> useradd -U -G wheel -p <newline>
> '$6$wcMRrkcdGeNHLT5b$password0ISmGZSsILOyV/WJnpassword//'
> <newline>
> accountname <newline>
>
> I would really really really like it if, in addition to the newlines that
> are added, a backslash could be added as well.  "Hey, this is a line
> enclosed in tildes.  I'm going to add line-breaks.  Each line-break except
> for the one at the end needs a backslash"
>
> useradd -U -G wheel -p \<newline>
> '$6$wcMRrkcdGeNHLT5b$password0ISmGZSsILOyV/WJnpassword//' \<newline>
> accountname <newline>
>
> Is such a thing possible?

Yes.

You can add a filter, see (info "(org) Advanced configuration")

The line breaks come _after_ the code is processed. So you need to make 
the line breaks happen before you know can replace them. Try:

#+BEGIN_SRC emacs-lisp
   (defun org-export-ascii-filter-code (text back-end info)
   "Replace `\\n' with `\\' in ascii code."
     (if (eq back-end 'ascii)
         (replace-regexp-in-string
          "\n" "\\\n"
          (org-babel-chomp
           (org-export-string-as text 'ascii t))
          nil t)
       text))
   (add-to-list 'org-export-filter-code-functions
                'org-export-ascii-filter-code)
#+END_SRC

with ascii export.

When I run this on your example, I get only one line break, but it is 
preceeded by a backslash.

Naturally, you will need to adapt this up for other backends as a single 
backslash might not be what is wanted.

HTH,

Chuck