Hi,
The function `org-babel-execute-src-block' will emit an error message
if the language is not loaded.
Before the error message, the patch will give a try to load the
associated babel language.
Why does the language exist in the `lang org-babel-load-languages' but
not be loaded?
Because the `org-babel-load-languages' are defined as a customer
variable with :set 'org-babel-do-load-languages, the ":set" function
can only be triggered with function `custom-set-variables`.
While setq/cl-pushnew `org-babel-load-languages' won't trigger the
`:set' function, then the error message will be displayed if I run the
code in the org file.
Please help review that patch. Thanks. Regards
From 39a15a34bdb8bd0c397fbd80cdfb0723ce229066 Mon Sep 17 00:00:00 2001
From: Lin Sun <sunl...@hotmail.com>
Date: Sat, 22 Apr 2023 00:00:39 +0000
Subject: [PATCH] *lisp/ob-core.el: load lang in (org-babel-execute-src-block)
---
lisp/ob-core.el | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/lisp/ob-core.el b/lisp/ob-core.el
index 471887a3a..2ed4f6b5b 100644
--- a/lisp/ob-core.el
+++ b/lisp/ob-core.el
@@ -795,7 +795,9 @@ guess will be made."
(cmd (intern (concat "org-babel-execute:" lang)))
result exec-start-time)
(unless (fboundp cmd)
- (error "No org-babel-execute function for %s!" lang))
+ (if (alist-get lang org-babel-load-languages)
+ (require (intern (concat "ob-" lang)))
+ (error "No org-babel-execute function for %s!" lang)))
(message "Executing %s %s %s..."
(capitalize lang)
(pcase executor-type
--
2.20.5
