;;; my-markup.el -- Markup related extensions for emacs core -*- lexical-binding: t -*-

;; Copyright (C) 2023 Free Software Foundation.

;; Author: Yuchen Pei <id@ypei.org>
;; Package-Requires: ((emacs "28.2"))

;; This file is part of dotfiles.

;; dotfiles is free software: you can redistribute it and/or modify it under
;; the terms of the GNU Affero General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; dotfiles 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 Affero General
;; Public License for more details.

;; You should have received a copy of the GNU Affero General Public
;; License along with dotfiles.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; Markup related extensions for emacs core.

;;; Code:


;;; shr
(defun my-shr-add-id (dom start end)
  (let ((id (dom-attr dom 'id)))
    (when id
      (put-text-property start end 'shr-frag-id id))))

(defun my-shr-add-id-advice (orig-fun &rest args)
  (let ((start (point)))
    (apply orig-fun args)
    (my-shr-add-id (car args) start (point))))

;;; dom
(defun my-dom-remove-style (node)
  (dolist (to-remove (dom-by-tag node 'style))
    (dom-remove-node node to-remove))
  node)
(defun my-dom-next-p-sibling (dom node)
  "Return the next para sibling of NODE in DOM."
  (when-let* ((parent (dom-parent dom node)))
    (let ((siblings (dom-children parent))
	        (next))
      (while (and siblings (not next))
	      (when (eq (pop siblings) node)
	        (setq next (car siblings))))
      (while (and siblings (not (and (listp next) (eq (dom-tag next) 'p))))
	      (setq next (pop siblings)))
      next)))
(defun my-dom-first-tag-text (dom tag)
  (car (dom-by-tag dom tag)))

;; xml
(defun my-xml-get-first-child (node tag)
  (car (xml-get-children node tag)))
(defun my-xml-get-first-child-text (node tag)
  (when-let ((text (dom-text (my-xml-get-first-child node tag))))
    (replace-regexp-in-string "\n" " " (string-trim text))))

(provide 'my-markup)
;;; my-markup.el ends here