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pjb-image-minor-mode.el
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pjb-image-minor-mode.el
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;;;; -*- mode:emacs-lisp;coding:utf-8 -*-
;;;;**************************************************************************
;;;;FILE: pjb-image-minor-mode.el
;;;;LANGUAGE: emacs lisp
;;;;SYSTEM: POSIX
;;;;USER-INTERFACE: NONE
;;;;DESCRIPTION
;;;;
;;;; This minor mode adds font-locking for image links that are
;;;; replaced by the image in the buffers.
;;;;
;;;;AUTHORS
;;;; <PJB> Pascal J. Bourguignon <pjb@informatimago.com>
;;;;MODIFICATIONS
;;;; 2021-08-07 <PJB> Created
;;;;BUGS
;;;;LEGAL
;;;; AGPL3
;;;;
;;;; Copyright Pascal J. Bourguignon 2021 - 2021
;;;;
;;;; This program 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.
;;;;
;;;; 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 Affero General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Affero General Public License
;;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;;;**************************************************************************
(require 'cl)
(require 'pjb-cl)
(defparameter *pjb-image--re*
'("\\[\\[\\([^]]+\\)\\]\\[\\([^]]+\\)\\]\\]"
(url . 1)
(text . 2)))
(defvar *pjb-image--links* '())
(defun pjb-image-get-image-at-url (url)
;; for now, only pathnames are accepted
(create-image url nil nil :max-width 510))
(defun pjb-image--search-image-links (limit)
(when (re-search-forward (car *pjb-image--re*) limit t)
(let ((start (match-beginning 0))
(end (match-end 0))
(url (match-string (cdr (assoc 'url (cdr *pjb-image--re*)))))
(text (match-string (cdr (assoc 'text (cdr *pjb-image--re*))))))
(when (display-images-p)
(push (cons start end) *pjb-image--links*)
(set-text-properties start end '(invisible t))
(let ((image (pjb-image-get-image-at-url url)))
(put-image image start))))))
(defun pjb-image--add-font-lock ()
(font-lock-add-keywords nil '((pjb-image--search-image-links))))
(defun pjb-image--remove-font-lock ()
(font-lock-remove-keywords nil '((pjb-image--search-image-links))))
(defvar pjb-image-minor-mode nil)
(defun pjb-image-minor--enable ()
(make-variable-buffer-local '*pjb-image--links*)
(add-to-list 'minor-mode-alist '(pjb-image-minor-mode " Img"))
(pjb-image--add-font-lock)
(setf pjb-image-minor-mode t))
(defun pjb-image-minor--disable ()
(pjb-image--remove-font-lock)
(dolist (range *pjb-image--links* (setf *pjb-image--links* '()))
(remove-text-properties (car range) (cdr range) '(invisble t)))
(remove-images (point-min) (point-max))
(setf pjb-image-minor-mode nil))
(defun pjb-image-minor-mode (&optional arg)
(interactive (list (or current-prefix-arg 'toggle)))
(let ((enable (if (eq arg 'toggle)
(not pjb-image-minor-mode)
(> (prefix-numeric-value arg) 0))))
(if enable
(pjb-image-minor--enable)
(pjb-image-minor--disable))))
;;;###autoload
(defcustom pjb-image-minor-mode nil
"Toggle then pjb-image-minor-mode; this mode displays in the buffer
the images that are linked such as [[foo.png][Example Foo Image]]
Setting this variable directly does not take effect;
use either \\[customize] or the function `pjb-image-minor-mode'."
:set 'custom-set-minor-mode
:initialize 'custom-initialize-default
:version "27.0"
:type 'boolean
:group 'pjb-image-minor-mode
:require 'pjb-image-minor-mode)
(provide 'pjb-image-minor-mode)