;;; gnus-html.el --- Render HTML in a buffer.
-;; Copyright (C) 2010 Free Software Foundation, Inc.
+;; Copyright (C) 2010-2016 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: html, web
;;; Code:
(eval-when-compile (require 'cl))
-(eval-when-compile (require 'mm-decode))
(require 'gnus-art)
+(eval-when-compile (require 'mm-decode))
+
(require 'mm-url)
(require 'url)
(require 'url-cache)
(require 'xml)
(require 'browse-url)
+(require 'mm-util)
(eval-and-compile (unless (featurep 'xemacs) (require 'help-fns)))
(defcustom gnus-html-image-cache-ttl (days-to-time 7)
"Time used to determine if we should use images from the cache."
:version "24.1"
:group 'gnus-art
- :type 'integer)
+ ;; FIXME hardly the friendliest type. The allowed value is actually
+ ;; any time value, but we are assuming no-one cares about USEC and
+ ;; PSEC here. It would be better to eg make it a number of minutes.
+ :type '(list integer integer))
(defcustom gnus-html-image-automatic-caching t
"Whether automatically cache retrieve images."
:group 'gnus-art
:type 'integer)
-(defcustom gnus-blocked-images "."
- "Images that have URLs matching this regexp will be blocked."
- :version "24.1"
- :group 'gnus-art
- :type 'regexp)
-
(defcustom gnus-max-image-proportion 0.9
"How big pictures displayed are in relation to the window they're in.
A value of 0.7 means that they are allowed to take up 70% of the
(charset (mail-content-type-get (mm-handle-type handle)
'charset)))
(when (and charset
- (setq charset (mm-charset-to-coding-system charset))
+ (setq charset (mm-charset-to-coding-system
+ charset nil t))
(not (eq charset 'ascii)))
(insert (prog1
(mm-decode-coding-string (buffer-string) charset)
(defun gnus-html-wash-images ()
"Run through current buffer and replace img tags by images."
- (let (tag parameters string start end images url)
+ (let (parameters start end url alt-text inhibit-images blocked-images)
+ (if (buffer-live-p gnus-summary-buffer)
+ (with-current-buffer gnus-summary-buffer
+ (setq inhibit-images gnus-inhibit-images
+ blocked-images (gnus-blocked-images)))
+ (setq inhibit-images gnus-inhibit-images
+ blocked-images (gnus-blocked-images)))
(goto-char (point-min))
;; Search for all the images first.
(while (re-search-forward "<img_alt \\([^>]*\\)>" nil t)
(delete-region (match-beginning 0) (match-end 0)))
(setq end (point))
(when (string-match "src=\"\\([^\"]+\\)" parameters)
- (setq url (gnus-html-encode-url (match-string 1 parameters)))
(gnus-message 8 "gnus-html-wash-tags: fetching image URL %s" url)
- (if (string-match "^cid:\\(.*\\)" url)
+ (setq url (gnus-html-encode-url (match-string 1 parameters))
+ alt-text (when (string-match "\\(alt\\|title\\)=\"\\([^\"]+\\)"
+ parameters)
+ (xml-substitute-special (match-string 2 parameters))))
+ (gnus-add-text-properties
+ start end
+ (list 'image-url url
+ 'image-displayer `(lambda (url start end)
+ (gnus-html-display-image url start end
+ ,alt-text))
+ 'gnus-image (list url start end alt-text)))
+ (widget-convert-button
+ 'url-link start (point)
+ :help-echo alt-text
+ :keymap gnus-html-image-map
+ url)
+ (if (string-match "\\`cid:" url)
;; URLs with cid: have their content stashed in other
;; parts of the MIME structure, so just insert them
;; immediately.
- (let ((handle (mm-get-content-id
- (setq url (match-string 1 url))))
- image)
- (when handle
- (mm-with-part handle
- (setq image (gnus-create-image (buffer-string)
- nil t))))
- (when image
- (let ((string (buffer-substring start end)))
- (delete-region start end)
- (gnus-put-image image (gnus-string-or string "*") 'cid)
- (gnus-add-image 'cid image))))
+ (let* ((handle (mm-get-content-id (substring url (match-end 0))))
+ (image (when (and handle
+ (not inhibit-images))
+ (gnus-create-image
+ (mm-with-part handle (buffer-string))
+ nil t))))
+ (if image
+ (gnus-add-image
+ 'cid
+ (gnus-put-image
+ (gnus-rescale-image
+ image (gnus-html-maximum-image-size))
+ (gnus-string-or (prog1
+ (buffer-substring start end)
+ (delete-region start end))
+ "*")
+ 'cid))
+ (widget-convert-button
+ 'link start end
+ :action 'gnus-html-insert-image
+ :help-echo url
+ :keymap gnus-html-image-map
+ :button-keymap gnus-html-image-map)))
;; Normal, external URL.
- (let ((alt-text (when (string-match "\\(alt\\|title\\)=\"\\([^\"]+\\)"
- parameters)
- (xml-substitute-special (match-string 2 parameters)))))
- (gnus-put-text-property start end 'gnus-image-url url)
- (if (gnus-html-image-url-blocked-p
- url
- (if (buffer-live-p gnus-summary-buffer)
- (with-current-buffer gnus-summary-buffer
- gnus-blocked-images)
- gnus-blocked-images))
- (progn
- (widget-convert-button
- 'link start end
- :action 'gnus-html-insert-image
- :help-echo url
- :keymap gnus-html-image-map
- :button-keymap gnus-html-image-map)
- (let ((overlay (gnus-make-overlay start end))
- (spec (list url start end alt-text)))
- (gnus-overlay-put overlay 'local-map gnus-html-image-map)
- (gnus-overlay-put overlay 'gnus-image spec)
- (gnus-put-text-property
- start end
- 'gnus-image spec)))
- ;; Non-blocked url
- (let ((width
- (when (string-match "width=\"?\\([0-9]+\\)" parameters)
- (string-to-number (match-string 1 parameters))))
- (height
- (when (string-match "height=\"?\\([0-9]+\\)" parameters)
- (string-to-number (match-string 1 parameters)))))
- ;; Don't fetch images that are really small. They're
- ;; probably tracking pictures.
- (when (and (or (null height)
- (> height 4))
- (or (null width)
- (> width 4)))
- (gnus-html-display-image url start end alt-text))))))))))
-
-(defun gnus-html-display-image (url start end alt-text)
+ (if (or inhibit-images
+ (gnus-html-image-url-blocked-p url blocked-images))
+ (widget-convert-button
+ 'link start end
+ :action 'gnus-html-insert-image
+ :help-echo url
+ :keymap gnus-html-image-map
+ :button-keymap gnus-html-image-map)
+ ;; Non-blocked url
+ (let ((width
+ (when (string-match "width=\"?\\([0-9]+\\)" parameters)
+ (string-to-number (match-string 1 parameters))))
+ (height
+ (when (string-match "height=\"?\\([0-9]+\\)" parameters)
+ (string-to-number (match-string 1 parameters)))))
+ ;; Don't fetch images that are really small. They're
+ ;; probably tracking pictures.
+ (when (and (or (null height)
+ (> height 4))
+ (or (null width)
+ (> width 4)))
+ (gnus-html-display-image url start end alt-text)))))))))
+
+(defun gnus-html-display-image (url start end &optional alt-text)
"Display image at URL on text from START to END.
Use ALT-TEXT for the image string."
- (if (gnus-html-cache-expired url gnus-html-image-cache-ttl)
- ;; We don't have it, so schedule it for fetching
- ;; asynchronously.
- (gnus-html-schedule-image-fetching
- (current-buffer)
- (list url alt-text))
- ;; It's already cached, so just insert it.
- (gnus-html-put-image (gnus-html-get-image-data url) url alt-text)))
+ (or alt-text (setq alt-text "*"))
+ (if (string-match "\\`cid:" url)
+ (let ((handle (mm-get-content-id (substring url (match-end 0)))))
+ (when handle
+ (gnus-html-put-image (mm-with-part handle (buffer-string))
+ url alt-text)))
+ (if (gnus-html-cache-expired url gnus-html-image-cache-ttl)
+ ;; We don't have it, so schedule it for fetching
+ ;; asynchronously.
+ (gnus-html-schedule-image-fetching
+ (current-buffer)
+ (list url alt-text))
+ ;; It's already cached, so just insert it.
+ (gnus-html-put-image (gnus-html-get-image-data url) url alt-text))))
(defun gnus-html-wash-tags ()
- (let (tag parameters string start end images url)
+ (let (tag parameters start end url)
(gnus-html-pre-wash)
(gnus-html-wash-images)
(gnus-article-add-button start end
'browse-url (mm-url-decode-entities-string url)
url)
- (let ((overlay (gnus-make-overlay start end)))
- (gnus-overlay-put overlay 'evaporate t)
- (gnus-overlay-put overlay 'gnus-button-url url)
+ (let ((overlay (make-overlay start end)))
+ (overlay-put overlay 'evaporate t)
+ (overlay-put overlay 'gnus-button-url url)
(gnus-put-text-property start end 'gnus-string url)
(when gnus-article-mouse-face
- (gnus-overlay-put overlay 'mouse-face gnus-article-mouse-face)))))
+ (overlay-put overlay 'mouse-face gnus-article-mouse-face)))))
;; The upper-case IMG_ALT is apparently just an artifact that
;; should be deleted.
((equal tag "IMG_ALT")
;; w3m does not normalize the case
((or (equal tag "b")
(equal tag "B"))
- (gnus-overlay-put (gnus-make-overlay start end) 'face 'gnus-emphasis-bold))
+ (overlay-put (make-overlay start end) 'face 'gnus-emphasis-bold))
((or (equal tag "u")
(equal tag "U"))
- (gnus-overlay-put (gnus-make-overlay start end) 'face 'gnus-emphasis-underline))
+ (overlay-put (make-overlay start end) 'face 'gnus-emphasis-underline))
((or (equal tag "i")
(equal tag "I"))
- (gnus-overlay-put (gnus-make-overlay start end) 'face 'gnus-emphasis-italic))
+ (overlay-put (make-overlay start end) 'face 'gnus-emphasis-italic))
((or (equal tag "s")
(equal tag "S"))
- (gnus-overlay-put (gnus-make-overlay start end) 'face 'gnus-emphasis-strikethru))
+ (overlay-put (make-overlay start end) 'face 'gnus-emphasis-strikethru))
((or (equal tag "ins")
(equal tag "INS"))
- (gnus-overlay-put (gnus-make-overlay start end) 'face 'gnus-emphasis-underline))
+ (overlay-put (make-overlay start end) 'face 'gnus-emphasis-underline))
;; Handle different UL types
((equal tag "_SYMBOL")
(when (string-match "TYPE=\\(.+\\)" parameters)
(replace-match "" t t))
(mm-url-decode-entities)))
-(defun gnus-html-insert-image ()
+(defun gnus-html-insert-image (&rest args)
"Fetch and insert the image under point."
(interactive)
(apply 'gnus-html-display-image (get-text-property (point) 'gnus-image)))
(defun gnus-html-browse-image ()
"Browse the image under point."
(interactive)
- (browse-url (get-text-property (point) 'gnus-image-url)))
+ (browse-url (get-text-property (point) 'image-url)))
(defun gnus-html-browse-url ()
"Browse the image under point."
(interactive)
(let ((url (get-text-property (point) 'gnus-string)))
- (if (not url)
- (message "No URL at point")
- (browse-url url))))
+ (cond
+ ((not url)
+ (message "No link under point"))
+ ((string-match "^mailto:" url)
+ (gnus-url-mailto url))
+ (t
+ (browse-url url)))))
(defun gnus-html-schedule-image-fetching (buffer image)
"Retrieve IMAGE, and place it into BUFFER on arrival."
(gnus-message 8 "gnus-html-schedule-image-fetching: buffer %s, image %s"
buffer image)
- (let ((args (list (car image)
+ (if (fboundp 'url-queue-retrieve)
+ (url-queue-retrieve (car image)
+ 'gnus-html-image-fetched
+ (list buffer image) t t)
+ (ignore-errors
+ (url-retrieve (car image)
'gnus-html-image-fetched
- (list buffer image))))
- (when (> (length (if (featurep 'xemacs)
- (split-string (function-arglist 'url-retrieve))
- (help-function-arglist 'url-retrieve)))
- 4)
- (setq args (nconc args (list t))))
- (apply #'url-retrieve args)))
+ (list buffer image)))))
(defun gnus-html-image-fetched (status buffer image)
"Callback function called when image has been fetched."
(unless (plist-get status :error)
- (when gnus-html-image-automatic-caching
- (url-store-in-cache (current-buffer)))
(when (and (or (search-forward "\n\n" nil t)
(search-forward "\r\n\r\n" nil t))
- (buffer-live-p buffer))
- (let ((data (buffer-substring (point) (point-max))))
- (with-current-buffer buffer
- (let ((inhibit-read-only t))
- (gnus-html-put-image data (car image) (cadr image)))))))
+ (not (eobp)))
+ (when gnus-html-image-automatic-caching
+ (url-store-in-cache (current-buffer)))
+ (when (buffer-live-p buffer)
+ (let ((data (buffer-substring (point) (point-max))))
+ (with-current-buffer buffer
+ (let ((inhibit-read-only t))
+ (gnus-html-put-image data (car image) (cadr image))))))))
(kill-buffer (current-buffer)))
(defun gnus-html-get-image-data (url)
(search-forward "\r\n\r\n" nil t))
(buffer-substring (point) (point-max)))))
+(defun gnus-html-maximum-image-size ()
+ "Return the maximum size of an image according to `gnus-max-image-proportion'."
+ (let ((edges (gnus-window-inside-pixel-edges
+ (get-buffer-window (current-buffer)))))
+ ;; (width . height)
+ (cons
+ ;; Aimed width
+ (truncate
+ (* gnus-max-image-proportion
+ (- (nth 2 edges) (nth 0 edges))))
+ ;; Aimed height
+ (truncate (* gnus-max-image-proportion
+ (- (nth 3 edges) (nth 1 edges)))))))
+
+;; Behind display-graphic-p test.
+(declare-function image-size "image.c" (spec &optional pixels frame))
+
(defun gnus-html-put-image (data url &optional alt-text)
+ "Put an image with DATA from URL and optional ALT-TEXT."
(when (gnus-graphic-display-p)
(let* ((start (text-property-any (point-min) (point-max)
- 'gnus-image-url url))
+ 'image-url url))
(end (when start
- (next-single-property-change start 'gnus-image-url))))
+ (next-single-property-change start 'image-url))))
;; Image found?
(when start
(let* ((image
(save-excursion
(goto-char start)
(let ((alt-text (or alt-text
- (buffer-substring-no-properties start end))))
+ (buffer-substring-no-properties start end)))
+ (inhibit-read-only t))
(if (and image
;; Kludge to avoid displaying 30x30 gif images, which
;; seems to be a signal of a broken image.
(= (car size) 30)
(= (cdr size) 30))))
;; Good image, add it!
- (let ((image (gnus-rescale-image
- image
- (let ((edges (gnus-window-inside-pixel-edges
- (get-buffer-window (current-buffer)))))
- ;; (width . height)
- (cons
- ;; Aimed width
- (truncate
- (* gnus-max-image-proportion
- (- (nth 2 edges) (nth 0 edges))))
- ;; Aimed height
- (truncate (* gnus-max-image-proportion
- (- (nth 3 edges) (nth 1 edges)))))))))
+ (let ((image (gnus-rescale-image image (gnus-html-maximum-image-size))))
(delete-region start end)
(gnus-put-image image alt-text 'external)
- (gnus-put-text-property start (point) 'help-echo alt-text)
- (gnus-overlay-put
- (gnus-make-overlay start (point)) 'local-map
- gnus-html-displayed-image-map)
+ (widget-convert-button
+ 'url-link start (point)
+ :help-echo alt-text
+ :keymap gnus-html-displayed-image-map
+ url)
(gnus-put-text-property start (point)
'gnus-alt-text alt-text)
(when url
- (gnus-put-text-property start (point)
- 'gnus-image-url url))
+ (gnus-add-text-properties
+ start (point)
+ `(image-url
+ ,url
+ image-displayer
+ (lambda (url start end)
+ (gnus-html-display-image url start end
+ ,alt-text)))))
(gnus-add-image 'external image)
t)
;; Bad image, try to show something else
url blocked-images))
ret))
-(defun gnus-html-show-images ()
- "Show any images that are in the HTML-rendered article buffer.
-This only works if the article in question is HTML."
- (interactive)
- (gnus-with-article-buffer
- (dolist (overlay (overlays-in (point-min) (point-max)))
- (let ((o (overlay-get overlay 'gnus-image)))
- (when o
- (apply 'gnus-html-display-image o))))))
-
;;;###autoload
(defun gnus-html-prefetch-images (summary)
(when (buffer-live-p summary)
- (let ((blocked-images (with-current-buffer summary
- gnus-blocked-images)))
+ (let (inhibit-images blocked-images)
+ (with-current-buffer summary
+ (setq inhibit-images gnus-inhibit-images
+ blocked-images (gnus-blocked-images)))
(save-match-data
- (while (re-search-forward "<img[^>]+src=[\"']\\([^\"']+\\)" nil t)
- (let ((url (gnus-html-encode-url (match-string 1))))
- (unless (gnus-html-image-url-blocked-p url blocked-images)
+ (while (re-search-forward "<img[^>]+src=[\"']\\(http[^\"']+\\)" nil t)
+ (let ((url (gnus-html-encode-url
+ (mm-url-decode-entities-string (match-string 1)))))
+ (unless (or inhibit-images
+ (gnus-html-image-url-blocked-p url blocked-images))
(when (gnus-html-cache-expired url gnus-html-image-cache-ttl)
(gnus-html-schedule-image-fetching nil
(list url))))))))))
projects / gnus / blobdiff