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;;; doasedit.el --- Automatic doasedit major-mode detection -*- lexical-binding: t; -*-
;; Copyright (C) 2026 Thomas Voss
;; Author: Thomas Voss <mail@thomasvoss.com>
;; Maintainer: Thomas Voss <mail@thomasvoss.com>
;; URL: https://git.thomasvoss.com/doasutils
;; Package-Version: 1.0.0
;; Package-Requires: ((emacs "24.4"))
;; Keywords: tools, convenience, files
;; This file is NOT part of GNU Emacs.
;;; License:
;;
;; Permission to use, copy, modify, and distribute this software for any
;; purpose with or without fee is hereby granted, provided that the above
;; copyright notice and this permission notice appear in all copies.
;;
;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
;; DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
;; OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
;; TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
;; PERFORMANCE OF THIS SOFTWARE.
;;; Commentary:
;;
;; This package provides `global-doasedit-mode', a minor-mode that
;; ensures that the correct major-mode is set in the current buffer when
;; editing files via the `doasedit' command-line utility.
;;; Code:
(defgroup doasedit nil
"Automatic major-mode detection when editing files via doasedit."
:group 'tools)
(defun doasedit--setup-buffer ()
(let* ((tmpdir (or (getenv "TMPDIR") "/tmp"))
(regexp (expand-file-name "\\`doasedit\\.")))
(when (and buffer-file-name (string-match-p regexp buffer-file-name))
(if-let ((target-file (getenv "DOASEDIT_EDITING")))
(let ((buffer-file-name target-file))
(set-auto-mode)
(rename-buffer (format "*doasedit: %s*" target-file) :unique))
(error "`DOASEDIT_EDITING' is not set.")))))
;;;###autoload
(define-minor-mode global-doasedit-mode
"Global minor-mode to automatically set the correct major-mode in the
current buffer when editing a root-protected file via the doasedit
command-line utility."
:global t
:lighter nil
(if global-doasedit-mode
(add-hook 'find-file-hook #'doasedit--setup-buffer)
(remove-hook 'find-file-hook #'doasedit--setup-buffer)))
(provide 'doasedit)
;;; doasedit.el ends here
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