org-babel: file output for ruby and python

With this change, if :file <filepath> is specified, ruby and python
blindly output a link to <filepath>. Responsibility for creating the
contents in <filepath> lies with the python/ruby code.

contrib/babel/lisp/langs/org-babel-python.el

@@ -40,15 +40,16 @@
   "Execute a block of Python code with org-babel.  This function is
 called by `org-babel-execute-src-block' via multiple-value-bind."
   (message "executing Python source code block")
-  (let ((full-body (concat
+  (let* ((full-body (concat
 		    (mapconcat ;; define any variables
 		     (lambda (pair)
 		       (format "%s=%s"
 			       (car pair)
 			       (org-babel-python-var-to-python (cdr pair))))
 		     vars "\n") "\n" (org-babel-trim body) "\n")) ;; then the source block body
-	(session (org-babel-python-initiate-session session)))
-    (org-babel-python-evaluate session full-body result-type)))
+	(session (org-babel-python-initiate-session session))
+	(result (org-babel-python-evaluate session full-body result-type)))
+    (or (cdr (assoc :file params)) result)))
 
 (defun org-babel-prep-session:python (session params)
   "Prepare SESSION according to the header arguments specified in PARAMS."

contrib/babel/lisp/langs/org-babel-ruby.el

@@ -50,15 +50,16 @@
   "Execute a block of Ruby code with org-babel.  This function is
 called by `org-babel-execute-src-block' via multiple-value-bind."
   (message "executing Ruby source code block")
-  (let ((full-body (concat
+  (let* ((full-body (concat
 		    (mapconcat ;; define any variables
 		     (lambda (pair)
 		       (format "%s=%s"
 			       (car pair)
 			       (org-babel-ruby-var-to-ruby (cdr pair))))
 		     vars "\n") "\n" body "\n")) ;; then the source block body
-	(session (org-babel-ruby-initiate-session session)))
-    (org-babel-ruby-evaluate session full-body result-type)))
+	(session (org-babel-ruby-initiate-session session))
+	(result (org-babel-ruby-evaluate session full-body result-type)))
+    (or (cdr (assoc :file params)) result)))
 
 (defun org-babel-prep-session:ruby (session params)
   "Prepare SESSION according to the header arguments specified in PARAMS."