Re: [BUG] hline handling in ob-ruby

[Eric Schulte <schulte.eric@gmail.com>]

Sorry about the delay in replying, apparently gmail has decided to
redirect large chunks of the Org-mode mailing list into my spam folder.
Perhaps it would be better to not use my @gmx account in the future.

Please do go ahead and apply this patch.  Thanks for porting this
solution over from ob-python, and sorry again about the delay!

Rick Frankel <rick@rickster.com> writes:

> Eric-
>
> There is a bug in ob-ruby --- if an literal 'hline is passed into
> (e.g., :hline no) a ruby block, the execution fails due to an
> incorrect datatype (this is not an issue in any other language). The
> patch provided in
> http://lists.gnu.org/archive/html/emacs-orgmode/2013-08/msg00316.html
> (and reattached here), applies the solution used in ox-python to
> handle the issue. An alternative solution is ok too :).
>
> I would be glad to apply the patch myself, but since you are the owner
> of the file i would appreciate you ok before proceeding.
>
> tia,
> rick
>
> From 4ae86a04680bcf671d43bb0b70bfddd083b743b2 Mon Sep 17 00:00:00 2001
> From: Rick Frankel <rick@rickster.com>
> Date: Thu, 15 Aug 2013 14:43:51 -0400
> Subject: [PATCH] Handle literal 'hline arguments passed to ruby. Solution
>  shamelessly copied from ob-python.
>
> * lisp/ob-ruby.el: New customizations `org-babel-ruby-hline-to' and
>   `org-babel-ruby-nil-to'
> (org-babel-ruby-var-to-ruby): Convert incoming 'hlines.
> (org-babel-ruby-table-or-string): Convert outgoing nils.
> ---
>  lisp/ob-ruby.el | 26 ++++++++++++++++++++++++--
>  1 file changed, 24 insertions(+), 2 deletions(-)
>
> diff --git a/lisp/ob-ruby.el b/lisp/ob-ruby.el
> index 20fb418..d15d288 100644
> --- a/lisp/ob-ruby.el
> +++ b/lisp/ob-ruby.el
> @@ -50,6 +50,20 @@
>  (defvar org-babel-ruby-command "ruby"
>    "Name of command to use for executing ruby code.")
>  
> +(defcustom org-babel-ruby-hline-to "nil"
> +  "Replace hlines in incoming tables with this when translating to ruby."
> +  :group 'org-babel
> +  :version "24.4"
> +  :package-version '(Org . "8.0")
> +  :type 'string)
> +
> +(defcustom org-babel-ruby-nil-to 'hline
> +  "Replace 'nil' in ruby tables with this before returning."
> +  :group 'org-babel
> +  :version "24.4"
> +  :package-version '(Org . "8.0")
> +  :type 'string)
> +
>  (defun org-babel-execute:ruby (body params)
>    "Execute a block of Ruby code with Babel.
>  This function is called by `org-babel-execute-src-block'."
> @@ -115,13 +129,21 @@ Convert an elisp value into a string of ruby source code
>  specifying a variable of the same value."
>    (if (listp var)
>        (concat "[" (mapconcat #'org-babel-ruby-var-to-ruby var ", ") "]")
> -    (format "%S" var)))
> +    (if (equal var 'hline)
> +	org-babel-ruby-hline-to
> +      (format "%S" var))))
>  
>  (defun org-babel-ruby-table-or-string (results)
>    "Convert RESULTS into an appropriate elisp value.
>  If RESULTS look like a table, then convert them into an
>  Emacs-lisp table, otherwise return the results as a string."
> -  (org-babel-script-escape results))
> +  ((lambda (res)
> +     (if (listp res)
> +	 (mapcar (lambda (el) (if (equal el 'nil)
> +				  org-babel-ruby-nil-to el))
> +		 res)
> +       res))
> +   (org-babel-script-escape results)))
>  
>  (defun org-babel-ruby-initiate-session (&optional session params)
>    "Initiate a ruby session.

-- 
Eric Schulte
https://cs.unm.edu/~eschulte
PGP: 0x614CA05D