;;; evil-collection-outline.el --- Evil bindings for outline-mode -*- lexical-binding: t -*-

;; Copyright (C) 2017 Pierre Neidhardt

;; Author: Pierre Neidhardt <mail@ambrevar.xyz>
;; Maintainer: James Nguyen <james@jojojames.com>
;; Pierre Neidhardt <mail@ambrevar.xyz>
;; URL: https://github.com/emacs-evil/evil-collection
;; Version: 0.0.1
;; Package-Requires: ((emacs "25.1"))
;; Keywords: evil, outline, tools

;; This file 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, or (at your
;; option) any later version.
;;
;; This file 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.
;;
;; For a full copy of the GNU General Public License
;; see <http://www.gnu.org/licenses/>.

;;; Commentary:
;; Evil bindings for outline-mode.

;;; Code:
(require 'evil-collection)
(require 'outline)

(defcustom evil-collection-outline-bind-tab-p t
  "Enable <tab>-based bindings in Outline mode.

Unless you have Evil bindings set up for Org mode, Org will
inherit the <tab>-based bindings from Outline.  Set this option
to nil if you want to preserve the Emacs-state <tab> keys in Org
mode."
  :group 'evil-collection-outline
  :type 'boolean)

(defconst evil-collection-outline-maps '(outline-mode-map))

;;;###autoload
(defun evil-collection-outline-setup ()
  "Set up `evil' bindings for `outline'."
  (evil-set-initial-state 'outline-mode 'normal)
  (when evil-collection-outline-bind-tab-p
    (evil-collection-define-key 'normal 'outline-mode-map
      (kbd "<backtab>") 'outline-show-all ; Also "z r" by default
      (kbd "<tab>") 'outline-toggle-children)) ; Also "z a" by default
  (evil-collection-define-key 'normal 'outline-mode-map
    ;; folding
    ;; Evil default keys:
    ;; zO: Show recursively for current branch only.
    ;; za: Toggle first level like outline-toggle-children.
    ;; zc: Hide complete subtree.
    ;; zm: Show only root notes.
    ;; zo: Show current node like "za".
    ;; zr: Show everything.
    ;; "ze" 'outline-hide-entry
    ;; "zE" 'outline-show-entry
    ;; "zl" 'outline-hide-leaves
    ;; "zb" 'outline-show-branches
    ;; "zo" 'outline-hide-other
    "zB" 'outline-hide-body ; Hide all bodies, Emacs has "C-c C-t".
    "zb" 'outline-hide-entry ; Hide current body, Emacs has "C-c C-c".
    "ze" 'outline-show-entry ; Show current body only, not subtree, reverse of outline-hide-entry, Emacs has "C-c C-e".
    "zl" 'outline-hide-leaves ; Like `outline-hide-body' but for current subtree only, Emacs has "C-c C-l".
    "zK" 'outline-show-branches ; Show all children recursively but no body.  Emacs has "C-c C-k".
    "zk" 'outline-show-children ; Direct children only unlike `outline-show-branches', and no content unlike `outline-show-entry' and `outline-toggle-children'.  Emacs has "C-c TAB".
    "zu" 'outline-up-heading

    "zp" 'outline-hide-other ; Hide all nodes and bodies except current body.  Emacs has "C-c C-o".
    ;; outline-hide-sublevels ; q ; Is it any different from `outline-hide-body'?
    ;; outline-hide-subtree ; Emacs has "C-c C-d", Evil has default "zc".
    ;; outline-show-subtree ; Emacs has "C-c C-s", Evil has default "zO".

    ;; TODO: To mark subtree ("C-c @"), we would need to define a tree object.

    ;; motion
    "[[" 'outline-previous-visible-heading
    "]]" 'outline-next-visible-heading
    (kbd "C-k") 'outline-backward-same-level
    (kbd "C-j") 'outline-forward-same-level
    "gk" 'outline-backward-same-level
    "gj" 'outline-forward-same-level

    (kbd "M-h") 'outline-promote ; Org-mode has "M-<left>", Evil-org has "M-h"
    (kbd "M-j") 'outline-move-subtree-down ; Org-mode has "M-<down>", Evil-org has "M-j"
    (kbd "M-k") 'outline-move-subtree-up ; Org-mode has "M-<up>", Evil-org has "M-k"
    (kbd "M-l") 'outline-demote ; Org-mode has "M-<right>", Evil-org has "M-l"

    (kbd "M-<return>") 'outline-insert-heading)) ; Org-mode has "M-<return>"

(provide 'evil-collection-outline)
;;; evil-collection-outline.el ends here