Minimally useful state achieved.

[gnus] / lisp / shr.el

diff --git a/lisp/shr.el b/lisp/shr.el
index 9bcdbe9..2b26a79 100644 (file)
--- a/lisp/shr.el
+++ b/lisp/shr.el
@@ -30,6 +30,26 @@
 
 ;;; Code:
 
 
 ;;; 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-width 70)
 (defvar shr-folding-mode nil)
 
 (defvar shr-width 70)


@@ -70,6 +90,105 @@
   (shr-generic cont)
   (insert "\n"))
 
   (shr-generic cont)
   (insert "\n"))
 

+(defun shr-b (cont)
+  (shr-fontize-cont cont 'bold))
+
+(defun shr-i (cont)
+  (shr-fontize-cont cont 'italic))
+
+(defun shr-u (cont)
+  (shr-fontize-cont cont 'underline))
+
+(defun shr-s (cont)
+  (shr-fontize-cont cont 'strikethru))
+
+(defun shr-fontize-cont (cont type)
+  (let ((start (point)))
+    (shr-generic cont)
+    (shr-add-font start (point) type)))
+
+(defun shr-add-font (start end type)
+  (put-text-property start end 'face type))
+
+(defun shr-a (cont)
+  (let ((start (point))
+       (url (cdr (assq :href cont))))
+    (shr-generic cont)
+    (widget-convert-button
+     'link 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-img (cont)
+  (let ((start (point-marker)))
+    (let ((alt (cdr (assq :alt cont)))
+         (url (cdr (assq :src cont))))
+      (when (zerop (length alt))
+       (setq alt "[img]"))
+      (cond
+       ((and shr-blocked-images
+            (string-match shr-blocked-images url))
+       (insert alt))
+       ((url-is-cached 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)))))
+      (insert " "))))
+
+(defun shr-image-fetched (status buffer start end)
+  (when (and (buffer-name buffer)
+            (not (plist-get status :error)))
+    (url-store-in-cache (current-buffer))
+    (when (or (search-forward "\n\n" nil t)
+             (search-forward "\r\n\r\n" nil t))
+      (let ((data (buffer-substring (point) (point-max))))
+        (with-current-buffer buffer
+          (let ((alt (buffer-substring start end))
+               (inhibit-read-only t))
+           (delete-region start end)
+           (shr-put-image data start alt))))))
+  (kill-buffer (current-buffer)))
+
+(defun shr-put-image (data point alt)
+  (if (not (display-graphic-p))
+      (insert alt)
+    (let ((image (shr-rescale-image data)))
+      (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))
+          (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-pre (cont)
   (let ((shr-folding-mode nil))
     (shr-ensure-newline)
 (defun shr-pre (cont)
   (let ((shr-folding-mode nil))
     (shr-ensure-newline)


@@ -97,6 +216,16 @@
              (insert "\n" elem)
            (insert " " elem))))))))
 
              (insert "\n" elem)
            (insert " " elem))))))))
 

+(defun shr-get-image-data (url)
+  "Get image data for URL.
+Return a string with image data."
+  (with-temp-buffer
+    (mm-disable-multibyte)
+    (url-cache-extract (url-cache-create-filename url))
+    (when (or (search-forward "\n\n" nil t)
+              (search-forward "\r\n\r\n" nil t))
+      (buffer-substring (point) (point-max)))))
+

 (provide 'shr)
 
 ;;; shr.el ends here
 (provide 'shr)
 
 ;;; shr.el ends here