bug#60568: [FR] 30.0.50; Help buffers and function bodies for generated functions

[Stefan Monnier]

> 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


diff --git a/lisp/org/ob-shell.el b/lisp/org/ob-shell.el
index 4a60186cd5d..5f7373c3faa 100644
--- a/lisp/org/ob-shell.el
+++ b/lisp/org/ob-shell.el
@@ -74,20 +74,25 @@ org-babel-shell-initialize
 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 (alist-get ,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 (alist-get 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))
+             '())))
 
 (defcustom org-babel-shell-names
   '("sh" "bash" "zsh" "fish" "csh" "ash" "dash" "ksh" "mksh" "posh")