Finding simpler better sudo for Emacs

[Jean Louis <bugs@gnu.support>]

* Michael Albinus <michael.albinus@gmx.de> [2021-03-30 13:14]:
> Jean Louis <bugs@gnu.support> writes:
> 
> Hi Jean,
> 
> > (defun sudo (&rest arguments)
> >   "Executes list ARGUMENTS with system command `sudo'."
> >   (let ((original-directory default-directory)
> > 	(default-directory "/sudo::")
> > 	(return (shell-command-to-string (string-join arguments " "))))
> >     (setq default-directory original-directory)
> >     return))
> 
> There's no need to keep and set original-directory, this is done by the
> let wrapper.

Maybe I know what you mean, as let wrapper should not set globally the
default directory, but practically, I have shown you that it is
changing to /root so that may be something done by tramp in
background, I do not know.

> And setting default-directory doesn't do anything, you would need let* in
> your approach.

Well, the function above did not change the default directoy, I would
not know what you mean. Important in that past moment is that it did
work that way. 

> With my adapted code snippet, you could do the following in order to
> keep the current directory:
> 
(defun sudo (&rest arguments)
  "Executes list ARGUMENTS with system command `sudo'."
  (let ((default-directory
  	  (concat "/sudo::" (file-local-name default-directory))))
    (shell-command-to-string (string-join arguments " "))))

(sudo "ls") → " 0install-ea1f1e-download
 847cf980479cf1dd15482464efa8620ca98c1c93c5a3ac1e2a1dd24918b9cd46.html
 adb.1001.log" ;; are files from my tmp

but then if I change to dired buffer ~/tmp and do: M-: -- (sudo "ls")
I get following error:

"sh: cd: /root/tmp/: No such file or directory

So, no, no, it does not work as you and me intended.

This one here still works better as it remembers the current
directory and brings it back, as Tramp probably does some change in
background, don't know why.

(defun sudo (&rest arguments)
  "Executes list ARGUMENTS with system command `sudo'."
  (let ((original-directory default-directory)
	(default-directory "/sudo::")
	(return (shell-command-to-string (string-join arguments " "))))
    (setq default-directory original-directory)
    return))
 
-- 
Jean

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