From: "Peter Neilson" <neilson@windstream.net>
To: emacs-orgmode@gnu.org
Subject: Re: Chaining strings between babel blocks: why so many '\'?
Date: Wed, 26 Mar 2014 19:35:00 -0400 [thread overview]
Message-ID: <op.xdcrsmkhrns8nc@localhost.localdomain> (raw)
In-Reply-To: <87bnwstxfs.fsf@gmail.com>
On Wed, 26 Mar 2014 18:19:35 -0400, Nicolas Goaziou <n.goaziou@gmail.com>
wrote:
> Hello,
>
> Alan Schmitt <alan.schmitt@polytechnique.org> writes:
>
>> I've been playing with block chaining to generate some dot file then to
>> export then as images. I had a little trouble finding the number of '\'
>> I need to put in front of a quote if I want the quote to be quoted. Here
>> is a way to make it work:
>>
>> #+name: foo
>> #+begin_src emacs-lisp :exports none
>> "bar [label = \"\\\\\"test1\\\\\"\"]\nbaz [label =
>> \"\\\\\"test2\\\\\"\"]"
>> #+end_src
>>
>> #+results: foo
>> : bar [label = "\\"test1\\""]
>> : baz [label = "\\"test2\\""]
>>
>> #+begin_src dot :file ~/tmp/test-dot.png :var input=foo :exports results
>> graph {
>> $input
>> }
>> #+end_src
>>
>> My question is: why can't I simply use this:
>>
>> #+name: foo
>> #+begin_src emacs-lisp :exports none
>> "bar [label = \"\\\"test1\\\"\"]\nbaz [label = \"\\\"test2\\\"\"]"
>> #+end_src
>>
>> #+results: foo
>> : bar [label = "\"test1\""]
>> : baz [label = "\"test2\""]
>>
>> (I guess the answer is in the error in replace-regexp-in-string:
>> (error "Invalid use of `\\' in replacement text")
>> .)
>
> Indeed. This function, unless told not to, treats backslashes characters
> specially.
>
>> Would it be problematic to first transform every "\\" into a "\\\\" in
>> org-babel-expand-body:dot, before the call to
>> replace-regexp-in-string?
>
> I think `replace-regexp-in-string' should be called with a non-nil
> LITERAL argument in this case.
Maybe someone (neilson runs and hides!) should write a tool that allows
construction of C++11-style raw string literals that would
auto-transmogrify into the backslash mess that elisp requires.
next prev parent reply other threads:[~2014-03-26 23:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-26 21:59 Chaining strings between babel blocks: why so many '\'? Alan Schmitt
2014-03-26 22:19 ` Nicolas Goaziou
2014-03-26 23:35 ` Peter Neilson [this message]
2014-03-27 12:41 ` Alan Schmitt
2014-03-29 11:10 ` Alan Schmitt
2014-04-16 15:37 ` Bastien
2014-04-16 18:01 ` Alan Schmitt
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