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org-babel-shell-initialize: Refactor 

* lisp/ob-shell.el (org-babel-shell-initialize): Refactor avoiding
`eval' runtime calls and assigning 'definition-name function symbol
property to assist Emacs help system with finding the definition.

Link: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=60568#71

> One of the discussed features was displaying function source code right
> in *Help* buffers. This feature usefulness have been objected at that
> time, on the grounds that showing function code may be too long and
> cause large *Help* buffers.

FWIW, I find myself regularly jumping to `M-x ielm` to look at the
`symbol-function`, so I would actually appreciate a button in the *Help*
buffer to display the actual value in the `symbol-function` slot.
This would also bring `describe-function` a bit closer to
`describe-variable`, which I think is good.

> 1. emacs -Q
> 2. M-: (require 'ob-shell)
> 3. <F1> f org-babel-execute:sh <RET>
> 4. Click on the source code link in *Help* buffer
> 5. Observe point jumping to (point-min) with no obvious way to find the
>    function definition.

We have `definition-name` for that.
I.e. `org-babel-shell-initialize` should arguably do

    (put 'org-babel-execute:sh 'definition-name 'org-babel-shell-initialize)

so that step 4 above jumps to `org-babel-shell-initialize`.

The patch below does that, along with saving some kittens.

        Stefan
This commit is contained in:
Stefan Monnier 2023-01-06 11:44:10 -05:00 committed by Ihor Radchenko
parent 0d5951a9b0
commit ecb62e2e31
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1 changed files with 18 additions and 13 deletions
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lisp/ob-shell.el
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@ -75,20 +75,25 @@ This function has to be called whenever `org-babel-shell-names'
is modified outside the Customize interface."
(interactive)
(dolist (name org-babel-shell-names)
(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-prompt-command
(or (cdr (assoc ,name org-babel-shell-set-prompt-commands))
(alist-get t org-babel-shell-set-prompt-commands))))
(org-babel-execute:shell body params))))
(eval `(defalias ',(intern (concat "org-babel-variable-assignments:" name))
'org-babel-variable-assignments:shell
,(format "Return list of %s statements assigning to the block's \
(let ((fname (intern (concat "org-babel-execute:" name))))
(defalias fname
(lambda (body params)
(:documentation
(format "Execute a block of %s commands with Babel." name))
(let ((shell-file-name name)
(org-babel-prompt-command
(or (cdr (assoc name org-babel-shell-set-prompt-commands))
(alist-get t org-babel-shell-set-prompt-commands))))
(org-babel-execute:shell body params))))
(put fname 'definition-name 'org-babel-shell-initialize))
(defalias (intern (concat "org-babel-variable-assignments:" name))
#'org-babel-variable-assignments:shell
(format "Return list of %s statements assigning to the block's \
variables."
name)))
(eval `(defvar ,(intern (concat "org-babel-default-header-args:" name)) '()))))
name))
(funcall (if (fboundp 'defvar-1) #'defvar-1 #'set) ;Emacs-29
(intern (concat "org-babel-default-header-args:" name))
nil)))
(defcustom org-babel-shell-names
'("sh" "bash" "zsh" "fish" "csh" "ash" "dash" "ksh" "mksh" "posh")