* Bug in org-lob: Function call adds space to argument string with parenthesis
Dear all,
  Please see the following code. I would expect arg="()" as result of the  call-line but the result is arg="() " with an additional space.

  #+NAME: test
  #+BEGIN_SRC emacs-lisp :var arg=""
(message "arg=%S" arg)
  #+END_SRC

  #+RESULTS:
  : arg=""

  #+call: test(arg="()")

  #+RESULTS:
  : arg="() "


* My current fast and dirty hack is using sexps instead of regular expressions:

  #+BEGIN_SRC emacs-lisp
(require 'ob-lob)
(defadvice org-babel-lob-get-info (around correct-args activate)
  "Return a Library of Babel function call as a list.
1st element is the function call as a string.
2nd element is the indentation width
3rd element is the name of the function call if this call is named."
  (setq ad-return-value (let ((case-fold-search t)
                                                      (nonempty (lambda (a b)
                                                                                  (let ((it (match-string a)))
                                                                                    (if (= (length it) 0) (match-string b) it)))))
                                                  (save-excursion
                                                    (beginning-of-line 1)
                                                    (when (looking-at org-babel-lob-one-liner-regexp)
                                                      (append
                                                       (list (if (= (length (match-string 12)) 0)
                                                                                (org-babel-lob-get-info-call-line)
                                                                       (org-babel-lob-get-info-inline)))
                                                       (list (length (if (= (length (match-string 12)) 0)
                                                                                                (match-string 2) (match-string 11)))
                                                                     (save-excursion
                                                                       (forward-line -1)
                                                                       (and (looking-at (concat org-babel-src-name-regexp
                                                                                                                                "\\([^\n]*\\)$"))
                                                                                    (org-no-properties (match-string 1)))))))))))

(defun org-babel-lob-get-info-call-line ()
  "Unify Library of Babel call string of form \"#+CALL:\"
The unified syntax is
,,#+CALL: <name>[<inside header arguments>](<arguments>) <end header arguments>"
  (save-excursion
    (save-match-data
      (let ((name "")
                    (inside-header-args "[]")
                    (args "()")
                    end-header-args)
                (skip-syntax-forward " ")
                (unless (looking-at "#\\+call:[[:space:]]+\\(\\(?:\\sw\\|\\s_\\)+\\)")
                  (error "Expecting #+CALL: at beginning of line"))
                (setq name (match-string 1))
                (goto-char (match-end 0))
                (skip-syntax-forward " ")
                (when (eq (char-after) ?\[) ;; inside-header-args
                  (setq inside-header-args (buffer-substring-no-properties (point) (goto-char (scan-sexps (point) 1)))))
                (skip-syntax-forward " ")
                (when (eq (char-after) ?\()
                  (setq args (buffer-substring-no-properties (point) (goto-char (scan-sexps (point) 1)))))
                (setq end-header-args (buffer-substring-no-properties (point) (line-end-position)))
                (concat name inside-header-args args end-header-args)))))

(defun org-babel-lob-get-info-inline ()
  "Transform one-line Library of Babel calls of form call_<name>[<inside header arguments>](<arguments>)[<end header arguments>] into the unified syntax
,,#+CALL: <name>[<inside header arguments>](<arguments>) <end header arguments>"
  (save-excursion
    (save-match-data
      (let ((name "")
                    (inside-header-args "[]")
                    (args "()")
                    (end-header-args ""))
                (skip-syntax-forward " ")
                (unless (looking-at "call_\\(\\(?:\\sw\\|\\s_\\)+\\)")
                  (error "Expecting #+CALL: at beginning of line"))
                (setq name (match-string 1))
                (goto-char (match-end 0))
                (skip-syntax-forward " ")
                (when (eq (char-after) ?\[) ;; inside-header-args
                  (setq inside-header-args (buffer-substring-no-properties (point) (goto-char (scan-sexps (point) 1)))))
                (skip-syntax-forward " ")
                (when (eq (char-after) ?\()
                  (setq args (buffer-substring-no-properties (point) (goto-char (scan-sexps (point) 1)))))
                (when (eq (char-after) ?\[)
                  (setq end-header-args (buffer-substring-no-properties (1+ (point)) (1- (scan-sexps (point) 1)))))
                (concat name inside-header-args args end-header-args)))))
  #+END_SRC


  Emacs  : GNU Emacs 24.5.1 (x86_64-unknown-cygwin, GTK+ Version 3.14.13)
of 2015-06-23 on desktop-new
Package: Org-mode version 8.3.2

Mit freundlichen Grüßen / Best regards
Tobias Zawada
Engineering / Software Development
T

+49 (351) 26050 0

F

+49 (351) 26050 155

Zawada@itisim.com<mailto:Zawada@itisim.com>



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