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;;; outline-conf.el --- Configurations for outline -*- lexical-binding: t; -*-
;; Copyright (C) 2021 李俊緯
;; Author: 李俊緯 <mmemmew@gmail.com>
;; Keywords: convenience, files, languages, maint, matching, outlines, tools
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; My configurations for `outline-minor-mode'.
;;; Code:
(require 'outline)
;;;###autoload
(defvar durand-outline-regexp-alist nil
"An alist that associates regular expressions with major modes
that enable `outline-minor-mode'.")
(setq durand-outline-regexp-alist
(list (cons 'emacs-lisp-mode
(rx-to-string
'(seq bol (>= 3 ";") (syntax ?-)) t))))
;;;###autoload
(defvar durand-outline-blocklist (list 'org-mode 'outline-mode)
"The list of major modes in which one should not use
`outline-minor-mode'.")
;;;###autoload
(defun durand-maybe-enable-outline ()
"Enable `outline-minor-mode' if appropriate."
(interactive)
(cond
((apply #'derived-mode-p durand-outline-blocklist)
(user-error "Should not use `outline-minor-mode' with %S"
major-mode))
((null outline-minor-mode)
(let ((regexp (cdr-safe (assq major-mode durand-outline-regexp-alist))))
(cond
(regexp
(setq-local outline-regexp regexp))))
(outline-minor-mode 1)
(message "`outline-minor-mode' enabled"))
(t
(outline-minor-mode -1)
(message "`outline-minor-mode' disabled"))))
(setq outline-minor-mode-highlight 'override)
(setq outline-minor-mode-cycle t)
(define-key outline-minor-mode-map (vector 3 ?\C-n) #'outline-next-visible-heading)
(define-key outline-minor-mode-map (vector 3 ?\C-p) #'outline-previous-visible-heading)
(define-key outline-minor-mode-map (vector 3 ?\C-f) #'outline-forward-same-level)
(define-key outline-minor-mode-map (vector 3 2) #'outline-backward-same-level)
(define-key outline-minor-mode-map (vector 3 1) #'outline-show-all)
(define-key outline-minor-mode-map (vector 3 ?\C-o) #'outline-hide-other)
(define-key outline-minor-mode-map (vector 3 ?\C-u) #'outline-up-heading)
(provide 'outline-conf)
;;; outline-conf.el ends here
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