From: Eric Schulte <schulte.eric@gmail.com>
To: "Charles C. Berry" <ccberry@ucsd.edu>
Cc: emacs-orgmode@gnu.org
Subject: Re: [bug][babel] noweb gotcha
Date: Thu, 12 Jun 2014 19:41:54 -0400 [thread overview]
Message-ID: <87d2edvgoc.fsf@gmail.com> (raw)
In-Reply-To: alpine.OSX.2.00.1406121350570.6306@charles-berrys-macbook.local
"Charles C. Berry" <ccberry@ucsd.edu> writes:
> On Thu, 12 Jun 2014, Eric Schulte wrote:
>
>> Charles Berry <ccberry@ucsd.edu> writes:
>>
>>> The following
>>>
>>> ,----
>>> | #+PROPERTY: tangle yes
>>> |
>>> | #+NAME: print-abc
>>> | #+BEGIN_SRC emacs-lisp
>>> | (format
>>> | "<<%s>>" "abc")
>>> | #+END_SRC
>>> |
>>> | #+NAME: print-def
>>> | #+BEGIN_SRC emacs-lisp
>>> | (concat
>>> | "<<" "def" ">>")
>>> | #+END_SRC
>>> |
>>> | #+BEGIN_SRC emacs-lisp :noweb yes
>>> | <<print-abc>>
>>> | <<print-def>>
>>> | #+END_SRC
>>> `----
>>>
>>>
>>>
>>> tangles as
>>>
>>> ,----
>>> | (format
>>> | "<<%s>>" "abc")
>>> |
>>> | (concat
>>> | "<<" "def" ">>")
>>> |
>>> | (format
>>> | "<<%s>>" "abc")
>>> | (concat
>>> | "")
>>> `----
>>>
>>>
>>> Note that ""<<" "def" ">>" disappeared from (concat ...).
>>>
>>> FWIW, adding quotes inside the constant string in org-babel-noweb-wrap:
>>>
>>>
>>> "\\([^ \"\t\n][^\"]+?[^ \"\t]\\|[^ \"\t\n]\\)"
>>>
>>> fixes this instance.
>>>
>>
>> Does this raise any error, or fail silently?
>>
>> Thanks,
>> Eric
>
>
> Alas, it fails silently -- producing the erroneous output.
>
> I guess the issue is that
>
> `(re-search-forward (org-babel-noweb-wrap) nil t)'
>
> finds quoted expressions like
>
> 1. "<<abc>>"
> 2. (concat "<<" abc ">>")
>
> FWIW,
>
> (re-search-forward
> (org-babel-noweb-wrap
> "\\([^ \"\t\n][^\"]+?[^ \"\t]\\|[^ \"\t\n]\\)"
> ) nil t)
>
> (adding quotes to the [^...] bits) takes care of example 2. Not sure
> if example 1 is a feature or a bug - I sometimes use things like
>
> "<<text-I-want>>"
>
> so maybe modifying the regex is good enough?
>
> OTOH, <<no-such-chunk>> has no effect. Maybe checking that the
> reference actually resolves is better than tweaking the regexes.
>
So it is currently possible to raise errors when noweb references don't
resolve through the use of the `org-babel-noweb-error-all-langs'
variable. I just added `org-babel-noweb-error-all-langs' which may be
set to raise such errors regardless of the language of the code block.
Best,
Eric
>
>
> HTH,
>
> Chuck
>
>
--
Eric Schulte
https://cs.unm.edu/~eschulte
PGP: 0x614CA05D (see https://u.fsf.org/yw)
prev parent reply other threads:[~2014-06-12 23:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-11 3:30 [bug][babel] noweb gotcha Charles Berry
2014-06-12 19:58 ` Eric Schulte
2014-06-12 21:21 ` Charles C. Berry
2014-06-12 23:41 ` Eric Schulte [this message]
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