;;; Code:
+(defgroup shr nil
+ "Simple HTML Renderer"
+ :group 'mail)
+
+(defcustom shr-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
+width and height of the window. If they are larger than this,
+and Emacs supports it, then the images will be rescaled down to
+fit these criteria."
+ :version "24.1"
+ :group 'shr
+ :type 'float)
+
+(defcustom shr-blocked-images nil
+ "Images that have URLs matching this regexp will be blocked."
+ :version "24.1"
+ :group 'shr
+ :type 'regexp)
+
(defvar shr-folding-mode nil)
+(defvar shr-state nil)
+(defvar shr-start nil)
+(defvar shr-indentation 0)
(defvar shr-width 70)
(push (shr-transform-dom sub) result)))
(nreverse result)))
+;;;###autoload
(defun shr-insert-document (dom)
- (setq dom (shr-transform-dom dom))
- (shr-descend dom))
+ (let ((shr-state nil)
+ (shr-start nil))
+ (shr-descend (shr-transform-dom dom))))
(defun shr-descend (dom)
- (let ((function (intern (concat "shr-" (symbol-name (car dom))) obarray)))
+ (let ((function (intern (concat "shr-tag-" (symbol-name (car dom))) obarray)))
(if (fboundp function)
(funcall function (cdr dom))
(shr-generic (cdr dom)))))
(cond
((eq (car sub) :text)
(shr-insert (cdr sub)))
- ((consp (cdr sub))
+ ((listp (cdr sub))
(shr-descend sub)))))
-(defun shr-p (cont)
- (shr-ensure-newline)
- (insert "\n")
+(defun shr-tag-p (cont)
+ (shr-ensure-paragraph)
(shr-generic cont)
- (insert "\n"))
-
-(defun shr-b (cont)
+ (shr-ensure-paragraph))
+
+(defun shr-ensure-paragraph ()
+ (unless (bobp)
+ (if (bolp)
+ (unless (eql (char-after (- (point) 2)) ?\n)
+ (insert "\n"))
+ (if (save-excursion
+ (beginning-of-line)
+ (looking-at " *$"))
+ (insert "\n")
+ (insert "\n\n")))))
+
+(defun shr-tag-b (cont)
(shr-fontize-cont cont 'bold))
-(defun shr-i (cont)
+(defun shr-tag-i (cont)
(shr-fontize-cont cont 'italic))
-(defun shr-u (cont)
+(defun shr-tag-u (cont)
(shr-fontize-cont cont 'underline))
-(defun shr-s (cont)
- (shr-fontize-cont cont 'strikethru))
+(defun shr-tag-s (cont)
+ (shr-fontize-cont cont 'strike-through))
-(defun shr-fontize-cont (cont type)
- (let ((start (point)))
+(defun shr-fontize-cont (cont &rest types)
+ (let (shr-start)
(shr-generic cont)
- (shr-add-font start (point) type)))
+ (dolist (type types)
+ (shr-add-font (or shr-start (point)) (point) type))))
(defun shr-add-font (start end type)
- (put-text-property start end 'face type))
+ (let ((overlay (make-overlay start end)))
+ (overlay-put overlay 'face type)))
-(defun shr-img (cont)
- (shr-ensure-newline)
+(defun shr-tag-a (cont)
+ (let ((url (cdr (assq :href cont)))
+ shr-start)
+ (shr-generic cont)
+ (widget-convert-button
+ 'link shr-start (point)
+ :action 'shr-browse-url
+ :url url
+ :keymap widget-keymap
+ :help-echo url)))
+
+(defun shr-browse-url (widget &rest stuff)
+ (browse-url (widget-get widget :url)))
+
+(defun shr-tag-img (cont)
+ (when (and (> (current-column) 0)
+ (not (eq shr-state 'image)))
+ (insert "\n"))
(let ((start (point-marker)))
- (let ((alt (or (cdr (assq :alt cont)) "[img]"))
+ (let ((alt (cdr (assq :alt cont)))
(url (cdr (assq :src cont))))
- (if (url-is-cached url)
- (shr-put-image (shr-get-image-data url) (point) alt)
+ (when (zerop (length alt))
+ (setq alt "[img]"))
+ (cond
+ ((and shr-blocked-images
+ (string-match shr-blocked-images url))
+ (insert alt))
+ ((url-is-cached (browse-url-url-encode-chars url "[&)$ ]"))
+ (shr-put-image (shr-get-image-data url) (point) alt))
+ (t
(insert alt)
(url-retrieve url 'shr-image-fetched
- (list (current-buffer) start (point-marker)))))
- (shr-ensure-newline)))
+ (list (current-buffer) start (point-marker))
+ t)))
+ (insert " ")
+ (setq shr-state 'image))))
(defun shr-image-fetched (status buffer start end)
(when (and (buffer-name buffer)
(defun shr-put-image (data point alt)
(if (not (display-graphic-p))
(insert alt)
- (let ((image (create-image data nil t)))
- (put-image image point alt))))
-
-(defun shr-pre (cont)
- (let ((shr-folding-mode nil))
+ (let ((image (ignore-errors
+ (shr-rescale-image data))))
+ (when image
+ (put-image image point alt)))))
+
+(defun shr-rescale-image (data)
+ (if (or (not (fboundp 'imagemagick-types))
+ (not (get-buffer-window (current-buffer))))
+ (create-image data nil t)
+ (let* ((image (create-image data nil t))
+ (size (image-size image t))
+ (width (car size))
+ (height (cdr size))
+ (edges (window-inside-pixel-edges
+ (get-buffer-window (current-buffer))))
+ (window-width (truncate (* shr-max-image-proportion
+ (- (nth 2 edges) (nth 0 edges)))))
+ (window-height (truncate (* shr-max-image-proportion
+ (- (nth 3 edges) (nth 1 edges)))))
+ scaled-image)
+ (when (> height window-height)
+ (setq image (or (create-image data 'imagemagick t
+ :height window-height)
+ image))
+ (setq size (image-size image t)))
+ (when (> (car size) window-width)
+ (setq image (or
+ (create-image data 'imagemagick t
+ :width window-width)
+ image)))
+ image)))
+
+(defun shr-tag-pre (cont)
+ (let ((shr-folding-mode 'none))
(shr-ensure-newline)
(shr-generic cont)
(shr-ensure-newline)))
-(defun shr-blockquote (cont)
- (shr-pre cont))
+(defun shr-tag-blockquote (cont)
+ (let ((shr-indentation (+ shr-indentation 4)))
+ (shr-generic cont)))
(defun shr-ensure-newline ()
(unless (zerop (current-column))
(insert "\n")))
(defun shr-insert (text)
+ (when (eq shr-state 'image)
+ (insert "\n")
+ (setq shr-state nil))
(cond
((eq shr-folding-mode 'none)
- (insert t))
+ (insert text))
(t
- (let (column)
+ (let ((first t)
+ column)
+ (when (and (string-match "\\`[ \t\n]" text)
+ (not (bolp)))
+ (insert " "))
(dolist (elem (split-string text))
(setq column (current-column))
- (if (zerop column)
- (insert elem)
- (if (> (+ column (length elem) 1) shr-width)
- (insert "\n" elem)
- (insert " " elem))))))))
+ (when (> column 0)
+ (cond
+ ((and (or (not first)
+ (eq shr-state 'space))
+ (> (+ column (length elem) 1) shr-width))
+ (insert "\n"))
+ ((not first)
+ (insert " "))))
+ (setq first nil)
+ (when (and (bolp)
+ (> shr-indentation 0))
+ (insert (make-string shr-indentation ? )))
+ ;; The shr-start is a special variable that is used to pass
+ ;; upwards the first point in the buffer where the text really
+ ;; starts.
+ (unless shr-start
+ (setq shr-start (point)))
+ (insert elem))
+ (setq shr-state nil)
+ (when (and (string-match "[ \t\n]\\'" text)
+ (not (bolp)))
+ (insert " ")
+ (setq shr-state 'space))))))
(defun shr-get-image-data (url)
"Get image data for URL.
(search-forward "\r\n\r\n" nil t))
(buffer-substring (point) (point-max)))))
+(defvar shr-list-mode nil)
+
+(defun shr-tag-ul (cont)
+ (shr-ensure-paragraph)
+ (let ((shr-list-mode 'ul))
+ (shr-generic cont)))
+
+(defun shr-tag-ol (cont)
+ (let ((shr-list-mode 1))
+ (shr-generic cont)))
+
+(defun shr-tag-li (cont)
+ (shr-ensure-newline)
+ (let ((shr-indentation (+ shr-indentation 2)))
+ (if (numberp shr-list-mode)
+ (progn
+ (insert (format "%d " shr-list-mode))
+ (setq shr-list-mode (1+ shr-list-mode)))
+ (insert "* "))
+ (shr-generic cont)))
+
+(defun shr-tag-br (cont)
+ (unless (bobp)
+ (insert "\n"))
+ (shr-generic cont))
+
+(defun shr-tag-h1 (cont)
+ (shr-heading cont 'bold 'underline))
+
+(defun shr-tag-h2 (cont)
+ (shr-heading cont 'bold))
+
+(defun shr-tag-h3 (cont)
+ (shr-heading cont 'italic))
+
+(defun shr-tag-h4 (cont)
+ (shr-heading cont))
+
+(defun shr-tag-h5 (cont)
+ (shr-heading cont))
+
+(defun shr-tag-h6 (cont)
+ (shr-heading cont))
+
+(defun shr-heading (cont &rest types)
+ (shr-ensure-paragraph)
+ (apply #'shr-fontize-cont cont types)
+ (shr-ensure-paragraph))
+
(provide 'shr)
;;; shr.el ends here
projects / gnus / blobdiff