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(defun sudo-prefix-p (prefix)
"Return t if PREFIX is a sudo prefix."
(or (string-equal prefix "/sudo") (string-equal prefix "/sudo:")))
(defun ssh-prefix-p (prefix)
"Return t if PREFIX is a ssh prefix."
(string-equal prefix "/ssh"))
(defun sudo-file-name (filename)
"Return FILENAME with a sudo prefix.
If FILENAME already has a sudo prefix, do nothing. If FILENAME is
accessed over SSH, prefix it with \"/sudo:\". Otherwise, assume
FILENAME is a local path and prefix it with \"/sudo::\"."
(let* ((splitname (split-string filename ":"))
(prefix (car splitname))
(ssh-p (ssh-prefix-p prefix))
(sudo-p (sudo-prefix-p prefix)))
(if sudo-p
filename
(let ((sudo-prefix (if ssh-p "/sudo" "/sudo:"))
(components (if ssh-p (cdr splitname) splitname)))
(mapconcat 'identity (cons sudo-prefix components) ":")))))
(defun sudo-find-file (&optional arg)
"Find file and open it with sudo.
With a prefix ARG prompt edit currently visited file using sudo."
(interactive "P")
(if arg
(find-alternate-file (sudo-file-name buffer-file-name))
(find-file (sudo-file-name (read-file-name "Find file with sudo: ")))))
(defun sudo-current-file ()
(interactive)
(sudo-find-file t))
(use-package tramp
:init
;; disable vc integration for remote files
(setq vc-ignore-dir-regexp
(format "\\(%s\\)\\|\\(%s\\)"
vc-ignore-dir-regexp
tramp-file-name-regexp))
:bind
(("C-x +" . sudo-find-file)
("C-x !" . sudo-current-file))
:config
;; make sudo:remote-host work as expected
(add-to-list 'tramp-default-proxies-alist '(nil "\\`root\\'" "/ssh:%h:"))
(add-to-list 'tramp-default-proxies-alist
'((regexp-quote (system-name)) nil nil)))
(provide 'init-tramp)
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