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;;; km-outline.el --- Outline mode extensions
;; Copyright (C) 2012-2020 Kyle Meyer <kyle@kyleam.com>
;; Author: Kyle Meyer <kyle@kyleam.com>
;; URL: https://git.kyleam.com/emacs.d
;; 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 <http://www.gnu.org/licenses/>.
;;; Code:
(require 'outline)
(defun km/outline--parent-levels (n)
"Return list of parent levels.
4 -> (1 2 3)
1 -> nil"
(unless (> n 0)
(user-error "N must be positive"))
(let (parents)
(while (/= n 1)
(setq n (1- n))
(push n parents))
parents))
(defun km/outline-imenu-create-index ()
"Generate Imenu index for headings.
This assumes that `outline-regexp' marks the characters that
indicate a heading, but not the text following it. The heading
text is taken as everything on the line after the
`outline-regexp' match (except for any leading whitespace)."
(goto-char (point-min))
(let (path-alist ; ((level . heading))
index)
(while (re-search-forward (concat "^" outline-regexp) nil t)
(let* ((head (replace-regexp-in-string
"\\`\\s-*" ""
(buffer-substring-no-properties (point) (point-at-eol))))
(head-level (save-excursion (beginning-of-line)
(funcall outline-level)))
(parent-levels (km/outline--parent-levels head-level))
(parent-heads
(delq nil (mapcar (lambda (n) (cdr (assoc n path-alist)))
parent-levels)))
(target (concat (mapconcat #'identity
(append parent-heads
(list head))
" / "))))
(unless (string= head "")
(push (cons target (save-excursion (beginning-of-line) (point-marker)))
index))
(push (cons head-level head) path-alist)))
(nreverse index)))
(declare-function helm-imenu "helm-imenu")
;;;###autoload
(defun km/outline-jump-to-heading ()
"Jump to heading specified by `outline-regexp'."
(interactive)
(let ((imenu-create-index-function #'km/outline-imenu-create-index)
helm-cached-imenu-tick
helm-cached-imenu-alist
helm-cached-imenu-candidates)
(call-interactively #'helm-imenu)))
(provide 'km-outline)
;;; km-outline.el ends here
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