[PATCH] Fix to allow ob-babel-shell-names to be customised.

[Bernard Hurley <bernard@marcade.biz>]

Hi all,

At present customisation of the variable ob-babel-shell-names in
ob-shell.el doesn't work properly.  You can actually change its value
and save the customisation, but the org-babel-execute:<name> functions
get created for the hard coded value of the variable not the customised
value.

The following patch should fix it:

---------------snip------------
*** ob-shell.el.old	2016-07-22 20:43:43.190100908 +0100
--- ob-shell.el	2016-07-22 22:55:28.730037538 +0100
***************
*** 42,60 ****
  
  (defcustom org-babel-shell-names
    '("sh" "bash" "csh" "ash" "dash" "ksh" "mksh" "posh")
!   "List of names of shell supported by babel shell code blocks."
    :group 'org-babel
!   :type 'string
!   :initialize
    (lambda (symbol value)
!     (set-default symbol (second value))
      (mapc
       (lambda (name)
         (eval `(defun ,(intern (concat "org-babel-execute:" name)) (body params)
  		,(format "Execute a block of %s commands with Babel." name)
  		(let ((shell-file-name ,name))
  		  (org-babel-execute:shell body params)))))
!      (second value))))
  
  (defun org-babel-execute:shell (body params)
    "Execute a block of Shell commands with Babel.
--- 42,61 ----
  
  (defcustom org-babel-shell-names
    '("sh" "bash" "csh" "ash" "dash" "ksh" "mksh" "posh")
!   "List of names of shell supported by babel shell code blocks.
! Changing this variable outside the Customize interface has no effect."
    :group 'org-babel
!   :type '(repeat string)
!   :set
    (lambda (symbol value)
!     (set-default symbol value)
      (mapc
       (lambda (name)
         (eval `(defun ,(intern (concat "org-babel-execute:" name)) (body params)
  		,(format "Execute a block of %s commands with Babel." name)
  		(let ((shell-file-name ,name))
  		  (org-babel-execute:shell body params)))))
!      value)))
  
  (defun org-babel-execute:shell (body params)
    "Execute a block of Shell commands with Babel.
-----------------------snip----------

I am using Org version 8.3.5 in Emacs  25.1.50.1.

Cheers,

Bernard

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