[PATCH] Make src block location available to execution backends

[Vitalie Spinu <spinuvit@gmail.com>]

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Hi again, 

I wrapped it in a patch. All tests are fine. Will be very happy if
someone could have a glance. I have my FSF papers signed.

Thanks, 

    Vitalie


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From 90dc398856c121c0a1cac36d6726e49d9fa31570 Mon Sep 17 00:00:00 2001
From: Vitalie Spinu <spinuvit@gmail.com>
Date: Thu, 6 Jun 2013 12:04:02 +0200
Subject: [PATCH] make src block location available to execution backends

* lisp/ob-core.el (org-babel-where-is-src-block-head): return
  point-marker instead of point.

  (org-babel-current-exec-src-block-head): new global variable which is
  bound during `org-babel-execute-src-block-maybe'

  (org-babel-get-src-block-info): return a list of 7 elements, last
  being the header location

Evaluation backends might need to use the exact location of the block in
original org file. For example when inserting the correct source
references for visual debugging. With this patch the information on
current block is available in `org-babel-current-exec-src-block-head'.
---
 lisp/ob-core.el | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/lisp/ob-core.el b/lisp/ob-core.el
index 8d26c4e..93c5d5e 100644
--- a/lisp/ob-core.el
+++ b/lisp/ob-core.el
@@ -251,14 +251,14 @@ references; a process which could likely result in the execution
 of other code blocks.
 
 Returns a list
- (language body header-arguments-alist switches name indent)."
+ (language body header-arguments-alist switches name indent block-head)."
   (let ((case-fold-search t) head info name indent)
     ;; full code block
     (if (setq head (org-babel-where-is-src-block-head))
 	(save-excursion
 	  (goto-char head)
 	  (setq info (org-babel-parse-src-block-match))
-	  (setq indent (car (last info)))
+	  (setq indent (nth 5 info))
 	  (setq info (butlast info))
 	  (while (and (forward-line -1)
 		      (looking-at org-babel-multi-line-header-regexp))
@@ -274,7 +274,7 @@ Returns a list
     ;; resolve variable references and add summary parameters
     (when (and info (not light))
       (setf (nth 2 info) (org-babel-process-params (nth 2 info))))
-    (when info (append info (list name indent)))))
+    (when info (append info (list name indent head)))))
 
 (defvar org-current-export-file) ; dynamically bound
 (defmacro org-babel-check-confirm-evaluate (info &rest body)
@@ -535,6 +535,8 @@ can not be resolved.")
 
 ;;; functions
 (defvar call-process-region)
+(defvar org-babel-current-exec-src-block-head nil
+  "Marker to the currently processed src block.")
 
 ;;;###autoload
 (defun org-babel-execute-src-block (&optional arg info params)
@@ -562,6 +564,7 @@ block."
       (let* ((params (if params
 			 (org-babel-process-params merged-params)
 		       (nth 2 info)))
+	     (org-babel-current-exec-src-block-head (nth 6 info))
 	     (cachep (and (not arg) (cdr (assoc :cache params))
 			   (string= "yes" (cdr (assoc :cache params)))))
 	     (new-hash (when cachep (org-babel-sha1-hash info)))
@@ -592,7 +595,7 @@ block."
 		  (or (org-bound-and-true-p
 		       org-babel-call-process-region-original)
 		      (symbol-function 'call-process-region)))
-		 (indent (car (last info)))
+		 (indent (nth 5 info))
 		 result cmd)
 	    (unwind-protect
 		(let ((call-process-region
@@ -1592,7 +1595,7 @@ If the point is not on a source block then return nil."
         (< top initial) (< initial bottom)
         (progn (goto-char top) (beginning-of-line 1)
 	       (looking-at org-babel-src-block-regexp))
-        (point))))))
+        (point-marker))))))
 
 ;;;###autoload
 (defun org-babel-goto-src-block-head ()
-- 
1.8.1.2


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 >> Vitalie Spinu <spinuvit@gmail.com>
 >> on Wed, 05 Jun 2013 15:49:08 +0200 wrote:

 VS> Hi, 

 VS> ESS has a visual debugger that depends on the availability of source
 VS> references. It would be very nice if the debugger could step directly
 VS> through org buffers.

 VS> ESS was detecting org-src-edit buffers and redirecting references to
 VS> original org file for already quite a while. That because of the
 VS> availability of org-edit-src-beg-marker in src-edit
 VS> buffers. Unfortunately similar functionality is not available in babel.

 VS> I attach a patch that would allow ess-eval-buffer from ob-R.el to access
 VS> the location of the currently executed block through a temporary stored
 VS> marker in org-babel-current-exec-src-block-head.

 VS>     Vitalie


 VS> 	Modified   lisp/ob-core.el
 VS> diff --git a/lisp/ob-core.el b/lisp/ob-core.el
 VS> index 8d26c4e..653975a 100644
 VS> --- a/lisp/ob-core.el
 VS> +++ b/lisp/ob-core.el
 VS> @@ -251,7 +251,7 @@ references; a process which could likely result in the execution
 VS>  of other code blocks.
 
 VS>  Returns a list
 VS> - (language body header-arguments-alist switches name indent)."
 VS> + (language body header-arguments-alist switches name indent block-head)."
 VS>    (let ((case-fold-search t) head info name indent)
 VS>      ;; full code block
 VS>      (if (setq head (org-babel-where-is-src-block-head))
 VS> @@ -274,7 +274,7 @@ Returns a list
 VS>      ;; resolve variable references and add summary parameters
 VS>      (when (and info (not light))
 VS>        (setf (nth 2 info) (org-babel-process-params (nth 2 info))))
 VS> -    (when info (append info (list name indent)))))
 VS> +    (when info (append info (list name indent head)))))
 
 VS>  (defvar org-current-export-file) ; dynamically bound
 VS>  (defmacro org-babel-check-confirm-evaluate (info &rest body)
 VS> @@ -535,6 +535,8 @@ can not be resolved.")
 
 VS>  ;;; functions
 VS>  (defvar call-process-region)
 VS> +(defvar org-babel-current-exec-src-block-head nil
 VS> +  "Marker to the currently processed src block.")
 
 VS>  ;;;###autoload
 VS>  (defun org-babel-execute-src-block (&optional arg info params)
 VS> @@ -562,6 +564,7 @@ block."
 VS>        (let* ((params (if params
 VS>  			 (org-babel-process-params merged-params)
 VS>  		       (nth 2 info)))
 VS> +	     (org-babel-current-exec-src-block-head (nth 6 info))
 VS>  	     (cachep (and (not arg) (cdr (assoc :cache params))
 VS>  			   (string= "yes" (cdr (assoc :cache params)))))
 VS>  	     (new-hash (when cachep (org-babel-sha1-hash info)))
 VS> @@ -1592,7 +1595,7 @@ If the point is not on a source block then return nil."
 VS>          (< top initial) (< initial bottom)
 VS>          (progn (goto-char top) (beginning-of-line 1)
 VS>  	       (looking-at org-babel-src-block-regexp))
 VS> -        (point))))))
 VS> +        (point-marker))))))
 
 VS>  ;;;###autoload
 VS>  (defun org-babel-goto-src-block-head ()