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;;; html-wysiwyg.el --- WYSIWYG elements for HTML editing
;; Copyright (C) 2018 defanor
;; Author: defanor <defanor@uberspace.net>
;; Maintainer: defanor <defanor@uberspace.net>
;; Created: 2018-04-24
;; Keywords: WYSIWYG, HTML
;; Homepage: https://github.com/defanor/html-wysiwyg
;; Version: 0.1.0
;; This file is not part of GNU Emacs.
;; 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/>.
;;; Commentary:
;; Inspired by org-mode's link handling, but parsing HTML with regexps
;; like there's no tomorrow.
;;; Code:
(require 'thingatpt)
(define-minor-mode html-wysiwyg-mode
"A minor mode for partial WYSIWYG editing of HTML, akin to
org."
:keymap `((,(kbd "C-c , e") . html-wysiwyg-edit-link-at-point))
(if html-wysiwyg-mode
;; Enabled
(progn
(add-to-list 'font-lock-extra-managed-props 'invisible)
(add-to-list 'font-lock-extra-managed-props 'help-echo)
(html-wysiwyg-hide-links))
;; Disabled
(html-wysiwyg-show-links)))
(defvar html-wysiwyg-link-match
(rx (group "<a" (+? (not (any "<" ">"))) "href=" (syntax string-quote))
(group (*? (not (syntax string-quote))))
(group (syntax string-quote) (*? (not (any ">"))) ">")
(group (+? (not (any "<" ">"))))
(group "</a>"))
"A regular expression used to match <a> elements.")
(defvar html-wysiwyg-font-lock-keywords
`((,html-wysiwyg-link-match
0
(progn (add-text-properties (match-beginning 0)
(match-end 0) '(invisible t))
'default)
t)
(,html-wysiwyg-link-match
4
(progn
(add-text-properties
(match-beginning 4) (match-end 4)
`(invisible
nil
help-echo
,(buffer-substring-no-properties
(match-beginning 2) (match-end 2))))
'link)
t))
"Keywords for font lock mode.")
(defun html-wysiwyg-hide-links ()
"Hide <a> tags."
(interactive)
(font-lock-add-keywords nil html-wysiwyg-font-lock-keywords)
(font-lock-fontify-buffer))
(defun html-wysiwyg-show-links ()
"Make <a> tags visible again."
(interactive)
(font-lock-remove-keywords nil html-wysiwyg-font-lock-keywords)
(font-lock-fontify-buffer))
(defun html-wysiwyg-edit-link-at-point ()
"Edit an <a> element's @href attribute."
(interactive)
(save-excursion
(if (thing-at-point-looking-at html-wysiwyg-link-match)
(let* ((start (match-beginning 2))
(end (match-end 2))
(href (buffer-substring-no-properties start end))
(new-href (read-from-minibuffer "href: " href)))
(delete-region start end)
(goto-char start)
(insert new-href))
(message "No link at point."))))
(provide 'html-wysiwyg)
;;; html-wysiwyg.el ends here
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