new interactive function for removing code block results

* lisp/ob-keys.el (org-babel-key-bindings): Bound to C-c C-v k.

* lisp/ob.el (org-babel-map-regexp): New generic mapping macro.
  (org-babel-map-inline-src-blocks): Rewritten to use new macro.
  (org-babel-kill-results): Remove some or all results in the current
  file.

* lisp/ob-lob.el (org-babel-map-call-lines): Map over all lob call
  lines in the current file.

* doc/orgcard.tex: Document new keybinding.

doc/orgcard.tex

@@ -447,6 +447,7 @@ formula, \kbd{:=} a field formula.
 \key{check code block at point for errors}{C-c C-v c}
 \key{view expanded body of code block at point}{C-c C-v v}
 \key{view information about code block at point}{C-c C-v I}
+\key{delete some or all results in current buffer}{C-c C-v k}
 \key{go to named code block}{C-c C-v g}
 \key{go to named result}{C-c C-v r}
 \key{go to the head of the current code block}{C-c C-v u}

lisp/ob-keys.el

@@ -63,6 +63,8 @@ functions which are assigned key bindings, and see
     ("g" . org-babel-goto-named-src-block)
     ("r" . org-babel-goto-named-result)
     ("\C-r" . org-babel-goto-named-result)
+    ("k" . org-babel-kill-results)
+    ("\C-k" . org-babel-kill-results)
     ("\C-b" . org-babel-execute-buffer)
     ("b" . org-babel-execute-buffer)
     ("\C-s" . org-babel-execute-subtree)

lisp/ob-lob.el

@@ -87,7 +87,14 @@ If you change the value of this variable then your files may
 	  "\\|" org-babel-inline-lob-one-liner-regexp "\\)")
   "Regexp to match calls to predefined source block functions.")
 
-;; functions for executing lob one-liners
+;;;###autoload
+(defmacro org-babel-map-call-lines (file &rest body)
+  "Evaluate BODY forms on each #+call line in FILE.
+If FILE is nil evaluate BODY forms on source blocks in current
+buffer."
+  (declare (indent 1))
+  `(org-babel-map-regexp ,org-babel-block-lob-one-liner-regexp ,file ,@body))
+
 ;;;###autoload
 (defun org-babel-lob-execute-maybe ()
   "Execute a Library of Babel source block, if appropriate.

lisp/ob.el

@@ -65,6 +65,7 @@
 (declare-function orgtbl-to-orgtbl "org-table" (table params))
 (declare-function org-babel-tangle-comment-links "ob-tangle" (&optional info))
 (declare-function org-babel-lob-get-info "ob-lob" nil)
+(declare-function org-babel-map-call-lines "ob-lob" (file &rest body))
 (declare-function org-babel-ref-split-args "ob-ref" (arg-string))
 (declare-function org-babel-ref-parse "ob-ref" (assignment))
 (declare-function org-babel-ref-resolve "ob-ref" (ref))
@@ -721,12 +722,11 @@ end-body --------- point at the end of the body"
        (unless visited-p (kill-buffer to-be-removed))
        (goto-char point))))
 
-;;;###autoload
-(defmacro org-babel-map-inline-src-blocks (file &rest body)
-  "Evaluate BODY forms on each inline source-block in FILE.
+(defmacro org-babel-map-regexp (regexp file &rest body)
+  "Evaluate BODY forms on each match of REGEXP in FILE.
 If FILE is nil evaluate BODY forms on source blocks in current
 buffer."
-  (declare (indent 1))
+  (declare (indent 2))
   (let ((tempvar (make-symbol "file")))
     `(let* ((,tempvar ,file)
 	    (visited-p (or (null ,tempvar)
@@ -736,13 +736,21 @@ buffer."
 	 (when ,tempvar (find-file ,tempvar))
 	 (setq to-be-removed (current-buffer))
 	 (goto-char (point-min))
-	 (while (re-search-forward org-babel-inline-src-block-regexp nil t)
+	 (while (re-search-forward ,regexp nil t)
 	   (goto-char (match-beginning 1))
 	   (save-match-data ,@body)
 	   (goto-char (match-end 0))))
        (unless visited-p (kill-buffer to-be-removed))
        (goto-char point))))
 
+;;;###autoload
+(defmacro org-babel-map-inline-src-blocks (file &rest body)
+  "Evaluate BODY forms on each inline source-block in FILE.
+If FILE is nil evaluate BODY forms on source blocks in current
+buffer."
+  (declare (indent 1))
+  `(org-babel-map-regexp ,org-babel-inline-src-block-regexp ,file ,@body))
+
 ;;;###autoload
 (defun org-babel-execute-buffer (&optional arg)
   "Execute source code blocks in a buffer.
@@ -1325,6 +1333,7 @@ With optional prefix argument ARG, jump backward ARG many source blocks."
        (goto-char (match-beginning 5))))
    (org-babel-where-is-src-block-head)))
 
+;;;###autoload
 (defun org-babel-demarcate-block (&optional arg)
   "Wrap or split the code in the region or on the point.
 When called from inside of a code block the current block is
@@ -1367,6 +1376,17 @@ region is not active then the point is demarcated."
 			"#+end_src\n"))
 	(goto-char start) (move-end-of-line 1)))))
 
+;;;###autoload
+(defun org-babel-kill-results (arg)
+  "Remove the results from the current code block or call line.
+When called with prefix argument remove all results in the current file."
+  (interactive "P")
+  (if (null arg)
+      (org-babel-remove-result)
+    (org-babel-map-call-lines nil (org-babel-remove-result))
+    (org-babel-map-src-blocks nil (org-babel-remove-result))
+    (org-babel-map-inline-src-blocks nil (org-babel-remove-result))))
+
 (defvar org-babel-lob-one-liner-regexp)
 (defvar org-babel-inline-lob-one-liner-regexp)
 (defun org-babel-where-is-src-block-result (&optional insert info hash indent)