Re: [PATCH] ob-ruby.el: allow specification of ruby command w/header arg

[Juri Linkov]

>   Using the :ruby header arg.
>
> * lisp/ob-ruby.el (org-babel-execute:ruby): Locally set
>   `org-babel-ruby-command' using a header argument.
>
> TINYCHANGE
> ---
>  lisp/ob-ruby.el | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/lisp/ob-ruby.el b/lisp/ob-ruby.el
> index 669c2eabf..80870c6c0 100644
> --- a/lisp/ob-ruby.el
> +++ b/lisp/ob-ruby.el
> @@ -74,6 +74,9 @@ This function is called by `org-babel-execute-src-block'."
>                  (cdr (assq :session params))))
>           (result-params (cdr (assq :result-params params)))
>           (result-type (cdr (assq :result-type params)))
> +      (org-babel-ruby-command
> +       (or (cdr (assq :ruby params))
> +           org-babel-ruby-command))
>           (full-body (org-babel-expand-body:generic
>                    body params (org-babel-variable-assignments:ruby params)))
>           (result (if (member "xmp" result-params)

Thanks, this is a much needed change.  But currently it is limited only
to non-session code execution.  Here is an additional patch that also
supports the same feature for session code execution as well:

ob-ruby.el: allow specification of session ruby command w/header arg

* lisp/ob-ruby.el (org-babel-ruby-initiate-session): Use a header argument
to get ruby command.

diff --git a/lisp/org/ob-ruby.el b/lisp/org/ob-ruby.el
index 1b8088eaee..aa28bf1899 100644
--- a/lisp/org/ob-ruby.el
+++ b/lisp/org/ob-ruby.el
@@ -51,7 +51,8 @@ org-babel-tangle-lang-exts
 (defvar org-babel-default-header-args:ruby '())
 
 (defvar org-babel-ruby-command "ruby"
-  "Name of command to use for executing ruby code.")
+  "Name of command to use for executing ruby code.
+It's possible to override it by using a header argument `:ruby'")
 
 (defcustom org-babel-ruby-hline-to "nil"
   "Replace hlines in incoming tables with this when translating to ruby."
@@ -71,7 +72,7 @@ org-babel-execute:ruby
   "Execute a block of Ruby code with Babel.
 This function is called by `org-babel-execute-src-block'."
   (let* ((session (org-babel-ruby-initiate-session
-                  (cdr (assq :session params))))
+                  (cdr (assq :session params)) params))
          (result-params (cdr (assq :result-params params)))
          (result-type (cdr (assq :result-type params)))
          (full-body (org-babel-expand-body:generic
@@ -147,14 +148,15 @@ org-babel-ruby-table-or-string
                 res)
       res)))
 
-(defun org-babel-ruby-initiate-session (&optional session _params)
+(defun org-babel-ruby-initiate-session (&optional session params)
   "Initiate a ruby session.
 If there is not a current inferior-process-buffer in SESSION
 then create one.  Return the initialized session."
   (unless (string= session "none")
     (require 'inf-ruby)
-    (let* ((cmd (cdr (assoc inf-ruby-default-implementation
-                           inf-ruby-implementations)))
+    (let* ((cmd (cdr (or (assq :ruby params)
+                        (assoc inf-ruby-default-implementation
+                               inf-ruby-implementations))))
           (buffer (get-buffer (format "*%s*" session)))
           (session-buffer (or buffer (save-window-excursion
                                        (run-ruby cmd session)