mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-05 08:53:45 +00:00
171 lines
6.3 KiB
EmacsLisp
171 lines
6.3 KiB
EmacsLisp
;;; image-mode.el --- support for visiting image files
|
|
;;
|
|
;; Copyright (C) 2005 Free Software Foundation, Inc.
|
|
;;
|
|
;; Author: Richard Stallman <rms@gnu.org>
|
|
;; Keywords: multimedia
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; GNU Emacs 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 2, or (at your option)
|
|
;; any later version.
|
|
|
|
;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to the
|
|
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
;; Boston, MA 02110-1301, USA.
|
|
|
|
;;; Commentary:
|
|
|
|
;; Defines a major mode for visiting image files
|
|
;; that allows conversion between viewing the text of the file
|
|
;; and viewing the file as an image. Viewing the image
|
|
;; works by putting a `display' text-property on the
|
|
;; image data, with the image-data still present underneath; if the
|
|
;; resulting buffer file is saved to another name it will correctly save
|
|
;; the image data to the new file.
|
|
|
|
;;; Code:
|
|
|
|
(require 'image)
|
|
|
|
;;;###autoload (push '("\\.jpe?g\\'" . image-mode) auto-mode-alist)
|
|
;;;###autoload (push '("\\.png\\'" . image-mode) auto-mode-alist)
|
|
;;;###autoload (push '("\\.gif\\'" . image-mode) auto-mode-alist)
|
|
;;;###autoload (push '("\\.tiff?\\'" . image-mode) auto-mode-alist)
|
|
;;;###autoload (push '("\\.p[bpgn]m\\'" . image-mode) auto-mode-alist)
|
|
;;;###autoload (push '("\\.x[bp]m\\'" . image-mode-maybe) auto-mode-alist)
|
|
|
|
(defvar image-mode-map
|
|
(let ((map (make-sparse-keymap)))
|
|
(define-key map "\C-c\C-c" 'image-toggle-display)
|
|
map)
|
|
"Major mode keymap for Image mode.")
|
|
|
|
;;;###autoload
|
|
(defun image-mode ()
|
|
"Major mode for image files.
|
|
You can use \\<image-mode-map>\\[image-toggle-display]
|
|
to toggle between display as an image and display as text."
|
|
(interactive)
|
|
(kill-all-local-variables)
|
|
(setq mode-name "Image")
|
|
(setq major-mode 'image-mode)
|
|
(use-local-map image-mode-map)
|
|
(add-hook 'change-major-mode-hook 'image-toggle-display-text nil t)
|
|
(if (not (get-text-property (point-min) 'display))
|
|
(image-toggle-display)
|
|
;; Set next vars when image is already displayed but local
|
|
;; variables were cleared by kill-all-local-variables
|
|
(setq cursor-type nil truncate-lines t))
|
|
(run-mode-hooks 'image-mode-hook)
|
|
(message "%s" (concat (substitute-command-keys
|
|
"Type \\[image-toggle-display] to view the image as ")
|
|
(if (get-text-property (point-min) 'display)
|
|
"text" "an image") ".")))
|
|
|
|
;;;###autoload
|
|
(define-minor-mode image-minor-mode
|
|
"Toggle Image minor mode.
|
|
With arg, turn Image minor mode on if arg is positive, off otherwise.
|
|
See the command `image-mode' for more information on this mode."
|
|
nil " Image" image-mode-map
|
|
:group 'image
|
|
:version "22.1"
|
|
(if (not image-minor-mode)
|
|
(image-toggle-display-text)
|
|
(if (get-text-property (point-min) 'display)
|
|
(setq cursor-type nil truncate-lines t))
|
|
(add-hook 'change-major-mode-hook (lambda () (image-minor-mode -1)) nil t)
|
|
(message "%s" (concat (substitute-command-keys
|
|
"Type \\[image-toggle-display] to view the image as ")
|
|
(if (get-text-property (point-min) 'display)
|
|
"text" "an image") "."))))
|
|
|
|
;;;###autoload
|
|
(defun image-mode-maybe ()
|
|
"Set major or minor mode for image files.
|
|
Set Image major mode only when there are no other major modes
|
|
associated with a filename in `auto-mode-alist'. When an image
|
|
filename matches another major mode in `auto-mode-alist' then
|
|
set that major mode and Image minor mode.
|
|
|
|
See commands `image-mode' and `image-minor-mode' for more
|
|
information on these modes."
|
|
(interactive)
|
|
(let* ((mode-alist
|
|
(delq nil (mapcar
|
|
(lambda (elt)
|
|
(unless (memq (or (car-safe (cdr elt)) (cdr elt))
|
|
'(image-mode image-mode-maybe))
|
|
elt))
|
|
auto-mode-alist))))
|
|
(if (assoc-default buffer-file-name mode-alist 'string-match)
|
|
(let ((auto-mode-alist mode-alist))
|
|
(set-auto-mode)
|
|
(image-minor-mode t))
|
|
(image-mode))))
|
|
|
|
(defun image-toggle-display-text ()
|
|
"Showing the text of the image file."
|
|
(if (get-text-property (point-min) 'display)
|
|
(image-toggle-display)))
|
|
|
|
(defun image-toggle-display ()
|
|
"Start or stop displaying an image file as the actual image.
|
|
This command toggles between showing the text of the image file
|
|
and showing the image as an image."
|
|
(interactive)
|
|
(if (get-text-property (point-min) 'display)
|
|
(let ((inhibit-read-only t)
|
|
(buffer-undo-list t)
|
|
(modified (buffer-modified-p)))
|
|
(remove-list-of-text-properties (point-min) (point-max)
|
|
'(display intangible read-nonsticky
|
|
read-only front-sticky))
|
|
(set-buffer-modified-p modified)
|
|
(kill-local-variable 'cursor-type)
|
|
(kill-local-variable 'truncate-lines)
|
|
(if (called-interactively-p)
|
|
(message "Repeat this command to go back to displaying the image")))
|
|
;; Turn the image data into a real image, but only if the whole file
|
|
;; was inserted
|
|
(let* ((data
|
|
(string-make-unibyte
|
|
(buffer-substring-no-properties (point-min) (point-max))))
|
|
(image
|
|
(create-image data nil t))
|
|
(props
|
|
`(display ,image
|
|
intangible ,image
|
|
rear-nonsticky (display intangible)
|
|
;; This a cheap attempt to make the whole buffer
|
|
;; read-only when we're visiting the file (as
|
|
;; opposed to just inserting it).
|
|
read-only t front-sticky (read-only)))
|
|
(inhibit-read-only t)
|
|
(buffer-undo-list t)
|
|
(modified (buffer-modified-p)))
|
|
(add-text-properties (point-min) (point-max) props)
|
|
(set-buffer-modified-p modified)
|
|
;; Inhibit the cursor when the buffer contains only an image,
|
|
;; because cursors look very strange on top of images.
|
|
(setq cursor-type nil)
|
|
;; This just makes the arrow displayed in the right fringe
|
|
;; area look correct when the image is wider than the window.
|
|
(setq truncate-lines t)
|
|
(if (called-interactively-p)
|
|
(message "Repeat this command to go back to displaying the file as text")))))
|
|
|
|
(provide 'image-mode)
|
|
|
|
;; arch-tag: b5b2b7e6-26a7-4b79-96e3-1546b5c4c6cb
|
|
;;; image-mode.el ends here
|