[PATCH] ob-emacs-lisp: Set `lexical-binding' in source editing buffers

[Sebastian Miele <sebastian.miele@gmail.com>]

* lisp/ob-emacs-lisp.el (org-babel-execute:emacs-lisp,
  org-babel-emacs-lisp-lexical): Factor out the conversion of the
  :lexical source block argument to a form that is appropriate for
  `lexical-binding' and the LEXICAL argument to `eval'.

* lisp/ob-emacs-lisp.el (org-babel-edit-prep:emacs-lisp): Set
  `lexical-binding'.

* lisp/ob-emacs-lisp.el (org-babel-default-header-args:emacs-lisp):
  Update docstring.

TINYCHANGE
---
 lisp/ob-emacs-lisp.el | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/lisp/ob-emacs-lisp.el b/lisp/ob-emacs-lisp.el
index cd86f4a20..17952069e 100644
--- a/lisp/ob-emacs-lisp.el
+++ b/lisp/ob-emacs-lisp.el
@@ -43,7 +43,8 @@
 A value of \"yes\" or t causes source blocks to be eval'd using
 lexical scoping.  It can also be an alist mapping symbols to
 their value.  It is used as the optional LEXICAL argument to
-`eval', which see.")
+`eval', which see. And it is used as the value for
+`lexical-binding' in buffers created by `org-edit-src-code'.")

 (defun org-babel-expand-body:emacs-lisp (body params)
   "Expand BODY according to PARAMS, return the expanded body."
@@ -71,9 +72,7 @@ their value.  It is used as the optional LEXICAL argument to
                        (member "pp" result-params))
                    (concat "(pp " body ")")
                  body))
-             (if (listp lexical)
-                 lexical
-               (member lexical '("yes" "t"))))))
+             (org-babel-emacs-lisp-lexical lexical))))
       (org-babel-result-cond result-params
     (let ((print-level nil)
               (print-length nil))
@@ -88,6 +87,22 @@ their value.  It is used as the optional LEXICAL argument to
          (org-babel-pick-name (cdr (assq :rowname-names params))
                               (cdr (assq :rownames params))))))))

+(defun org-babel-emacs-lisp-lexical (lexical)
+  "Convert :lexical source block argument LEXICAL into the form
+appropriate for `lexical-binding' and the LEXICAL argument to
+`eval'."
+  (if (listp lexical)
+      lexical
+    (not (null (member lexical '("yes" "t"))))))
+
+(defun org-babel-edit-prep:emacs-lisp (info)
+  "Set `lexical-binding' according to :lexical source block
+argument."
+  (setq lexical-binding
+        (org-babel-emacs-lisp-lexical
+         (org-babel-read
+          (cdr (assq :lexical (nth 2 info)))))))
+
 (org-babel-make-language-alias "elisp" "emacs-lisp")

 (provide 'ob-emacs-lisp)
-- 
2.20.1