diff options
Diffstat (limited to 'lisp/mastodon-media.el')
| -rw-r--r-- | lisp/mastodon-media.el | 70 |
1 files changed, 46 insertions, 24 deletions
diff --git a/lisp/mastodon-media.el b/lisp/mastodon-media.el index 93ff1b7..289637e 100644 --- a/lisp/mastodon-media.el +++ b/lisp/mastodon-media.el @@ -43,25 +43,51 @@ (image-type-available-p 'imagemagick) "A boolean value stating whether to show avatars in timelines.") -(defun mastodon-media--image-from-url (url media-type) +(defun mastodon-media--process-image-response (status-plist marker image-options region-length image-url) + "Callback function processing the url retrieve response for URL. + +STATUS-PLIST is the usual plist of status events as per `url-retrieve'. +IMAGE-OPTIONS are the precomputed options to apply to the image. +MARKER is the marker to where the response should be visible. +REGION-LENGTH is the length of the region that should be replaced with the image. +IMAGE-URL is the URL that was retrieved. +" + (let ((url-buffer (current-buffer)) + (is-error-response-p (eq :error (car status-plist)))) + (unwind-protect + (let* ((data (unless is-error-response-p + (goto-char (point-min)) + (search-forward "\n\n") + (buffer-substring (point) (point-max)))) + (image (when data + (apply #'create-image data (when image-options 'imagemagick) + t image-options)))) + (switch-to-buffer (marker-buffer marker)) + ;; Save narrowing in our buffer + (let ((inhibit-read-only t)) + (save-restriction + (widen) + (put-text-property marker (+ marker region-length) 'media-state 'loaded) + (put-text-property marker (+ marker region-length) + 'display (or + image + (format "Failed to load %s" image-url))) + ;; We are done with the marker; release it: + (set-marker marker nil))) + (kill-buffer url-buffer))))) + +(defun mastodon-media--load-image-from-url (url media-type start region-length) "Takes a URL and MEDIA-TYPE and return an image. MEDIA-TYPE is a symbol and either 'avatar or 'media-link." - ;; TODO: Cache the avatars - (let* ((url-automatic-caching t) - (buffer (url-retrieve-synchronously url)) - (image-options (when (image-type-available-p 'imagemagick) - (case media-type - ('avatar `(:height ,mastodon-avatar-height)) - ('media-link `(:max-height ,mastodon-preview-max-height)))))) - (unwind-protect - (let ((data (with-current-buffer buffer - (goto-char (point-min)) - (search-forward "\n\n") - (buffer-substring (point) (point-max))))) - (apply #'create-image data (when image-options 'imagemagick) - t image-options)) - (kill-buffer buffer)))) + ;; TODO: Cache the avatars + (let ((image-options (when (image-type-available-p 'imagemagick) + (pcase media-type + ('avatar `(:height ,mastodon-avatar-height)) + ('media-link `(:max-height ,mastodon-preview-max-height)))))) + (url-retrieve url + #'mastodon-media--process-image-response + (list (copy-marker start) image-options region-length url)))) (defun mastodon-media--select-next-media-line () "Find coordinates of the next media to load. @@ -77,7 +103,7 @@ found." ;; do nothing - the loop will proceed ) (when next-pos - (case (get-text-property next-pos 'media-type) + (pcase (get-text-property next-pos 'media-type) ;; Avatars are just one character in the buffer ('avatar (list next-pos (+ next-pos 1) 'avatar)) ;; Media links are 5 character ("[img]") @@ -101,16 +127,12 @@ not been returned." (end (cadr line-details)) (media-type (caddr line-details)) (image-url (get-text-property start 'media-url))) - (if (not (mastodon-media--valid-link-p image-url)) + ;; mark it at least as not needing loading any more (put-text-property start end 'media-state 'invalid-url) + ;; proceed to load this image asynchronously (put-text-property start end 'media-state 'loading) - (let ((image (mastodon-media--image-from-url image-url media-type))) - (put-text-property start end 'media-state 'loaded) - (put-text-property start end - 'display (or - image - (format "Failed to load %s" image-url))))))))) + (mastodon-media--load-image-from-url image-url media-type start (- end start))))))) (provide 'mastodon-media) ;;; mastodon-media.el ends here |