Re: [Babel] [PATCH] Customize regular expression to match noweb references

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

Good idea,

I've changed your implementation to rely on two new customization
variables `org-babel-noweb-wrap-start' and `org-babel-noweb-wrap-end' as
this provides more flexibility to the backend implementation to place
constraints on the properties of the noweb names.

In you're situation you will now want to set...
(setq org-babel-noweb-wrap-start "«"
      org-babel-noweb-wrap-end   "»")

Thanks for the great idea,

"Sean O'Halpin" <sean.ohalpin@gmail.com> writes:

> Hi,
>
> Here's a patch I'm using to change the default regular expression used
> to match noweb references.
> The default regular expression "<<\\(.+?\\)>>" conflicts with Ruby
> syntax and confuses syntax highlighting.
> I now set this to "«\\(.+?\\)»", i.e. using guillemots instead
> (AltGr-z and AltGr-x on my keyboard).
>
> Regards,
> Sean
>
>
> Customizable regular expression to match noweb references.
> ---
>  lisp/ob-tangle.el |    4 +++-
>  lisp/ob.el        |    7 ++++++-
>  2 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/lisp/ob-tangle.el b/lisp/ob-tangle.el
> index d7c4d7e..4148774 100644
> --- a/lisp/ob-tangle.el
> +++ b/lisp/ob-tangle.el
> @@ -281,12 +281,14 @@ references."
>    (interactive)
>    (goto-char (point-min))
>    (while (or (re-search-forward "\\[\\[file:.*\\]\\[.*\\]\\]" nil t)
> -             (re-search-forward "<<[^[:space:]]*>>" nil t))
> +             (re-search-forward org-babel-noweb-regexp nil t))
>      (delete-region (save-excursion (beginning-of-line 1) (point))
>                     (save-excursion (end-of-line 1) (forward-char 1) (point)))))
>
>  (defvar org-stored-links)
>  (defvar org-bracket-link-regexp)
> +(defvar org-babel-noweb-regexp)
> +
>  (defun org-babel-tangle-collect-blocks (&optional language)
>    "Collect source blocks in the current Org-mode file.
>  Return an association list of source-code block specifications of
> diff --git a/lisp/ob.el b/lisp/ob.el
> index 47be708..bbd6209 100644
> --- a/lisp/ob.el
> +++ b/lisp/ob.el
> @@ -113,6 +113,11 @@ remove code block execution from the C-c C-c keybinding."
>    :group 'org-babel
>    :type 'boolean)
>
> +(defcustom org-babel-noweb-regexp "<<\\(.+?\\)>>"
> +  "Regular expression to use to match noweb references."
> +  :group 'org-babel
> +  :type 'string)
> +
>  (defcustom org-babel-results-keyword "RESULTS"
>    "Keyword used to name results generated by code blocks.
>  Should be either RESULTS or NAME however any capitalization may
> @@ -2159,7 +2164,7 @@ block but are passed literally to the \"example-block\"."
>        (with-temp-buffer
>          (insert body) (goto-char (point-min))
>          (setq index (point))
> -        (while (and (re-search-forward "<<\\(.+?\\)>>" nil t))
> +        (while (and (re-search-forward org-babel-noweb-regexp nil t))
>            (save-match-data (setf source-name (match-string 1)))
>            (save-match-data (setq evaluate (string-match "\(.*\)" source-name)))
>            (save-match-data

-- 
Eric Schulte
http://cs.unm.edu/~eschulte/