":eval non-export" inhibits evaluation during export

* doc/org.texi (eval): Documentation of the new :eval option.
* lisp/ob.el (org-babel-confirm-evaluate): Inhibit evaluation during
  export when eval is set to "non-export".

doc/org.texi

@@ -13112,12 +13112,14 @@ permissions of the tangled file are set to make it executable.
 @node eval,  , shebang, Specific header arguments
 @subsubsection @code{:eval}
 The @code{:eval} header argument can be used to limit the evaluation of
-specific code blocks.  @code{:eval} accepts two arguments ``never'' and
-``query''.  @code{:eval never} (or @code{:eval no}) will ensure that a code
-block is never evaluated, this can be useful for protecting against the
-evaluation of dangerous code blocks.  @code{:eval query} will require a query
-for every execution of a code block regardless of the value of the
-@code{org-confirm-babel-evaluate} variable.
+specific code blocks.  @code{:eval} accepts three arguments ``never'',
+``query'' and ``non-export''.  @code{:eval never} (or @code{:eval no}) will
+ensure that a code block is never evaluated, this can be useful for
+protecting against the evaluation of dangerous code blocks.  @code{:eval
+query} will require a query for every execution of a code block regardless of
+the value of the @code{org-confirm-babel-evaluate} variable and @code{:eval
+non-export} will inhibit the evaluation of code blocks during export but will
+still allow interactive evaluation.
 
 If this header argument is not set then evaluation is determined by the value
 of the @code{org-confirm-babel-evaluate} variable see @ref{Code evaluation

lisp/ob.el

@@ -257,6 +257,7 @@ of potentially harmful code."
                                 (nth 0 info) (nth 1 info)))
                       (t org-confirm-babel-evaluate))))
     (if (or (equal eval "never") (equal eval "no")
+	    (and (equal eval "non-export") org-current-export-file)
 	    (and query
 		 (not (yes-or-no-p
 		       (format "Evaluate this%scode block%son your system? "
@@ -264,7 +265,8 @@ of potentially harmful code."
 			       (if (nth 4 info)
 				   (format " (%s) " (nth 4 info)) " "))))))
 	(prog1 nil (message "Evaluation %s"
-			    (if (or (equal eval "never") (equal eval "no"))
+			    (if (or (equal eval "never") (equal eval "no")
+				    (equal eval "non-export"))
 				"Disabled" "Aborted")))
       t)))