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Re: Auto-Prompt for Password and Raise Privilegies when needed
From: |
Nordlöw |
Subject: |
Re: Auto-Prompt for Password and Raise Privilegies when needed |
Date: |
Wed, 5 May 2010 13:25:09 -0700 (PDT) |
User-agent: |
G2/1.0 |
On 5 Maj, 06:14, Stefan Monnier <monn...@iro.umontreal.ca> wrote:
> > with the main problem being that `first-edit-read-only-file-hook'
> > doesn't exist, and there don't seem to be any analogs.
>
> There's first-change-hook, which is somewhat close.
> Of course, this only works if the buffer is writable (i.e. if the buffer
> is read-only, attempts to modify the buffer will signal an error before
> getting a chance to run this hook).
>
> Stefan
This works really nicely for me.
(defvar post-ro-edit-hook nil
"Hooks to run first time a root-read-only buffer gets modified.")
(defun post-ro-edit-hook ()
"Hook run when the user tries to modify a read-only buffer file
owned by root."
(when (y-or-n-p (format "Reopen buffer file %s as root to edit? "
buffer-file-name))
(let ((p (point)))
(find-alternate-file (concat "/sudo::" buffer-file-name)) ;open
with sudo instead
(goto-point p)) ;goto same point in reopened file so that
pending changes occurr at right position
(unwind-protect (run-hooks 'post-ro-edit-hook))))
(defun find-file-auto-raise-privs ()
"If current buffer is read-only, but writable by root, raise
priviligies."
(interactive "")
(when (and buffer-read-only ;buffer is
readonly
buffer-file-name ;buffer is a
file
(not (file-writable-p buffer-file-name)) ;file it is not
writable
(= (nth 2 (file-attributes buffer-file-name)) 0)) ;file
is owned by root
(toggle-read-only -1) ;make it writable so that `before-change-
functions' is run
(add-hook 'first-change-hook 'post-ro-edit-hook nil t) ;activate
before-change-hook locally in this buffer
))
(add-hook 'find-file-hook 'find-file-auto-raise-privs)
/Per