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

["Sean O'Halpin" <sean.ohalpin@gmail.com>]

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
-- 
1.7.0.4