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;;; mastodon-media.el --- Functions for inlining Mastodon media
;; Copyright (C) 2017 Johnson Denen
;; Author: Johnson Denen <johnson.denen@gmail.com>
;; Version: 0.6.2
;; Homepage: https://github.com/jdenen/mastodon.el
;; This file is not part of GNU Emacs.
;; This file is part of mastodon.el.
;; mastodon.el 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 3 of the License, or
;; (at your option) any later version.
;; mastodon.el 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 mastodon.el. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; mastodon-media.el provides functions for inlining media.
;; Known bug gnutls -12 when trying to access images on some systems.
;; It looks like their may be a version mismatch between the encryption
;; required by the server and client.
;;; Code:
(require 'mastodon-http nil t)
(defgroup mastodon-media nil
"Inline Mastadon media."
:prefix "mastodon-media-"
:group 'mastodon)
(defun mastodon-media--image-from-url (url)
"Takes a URL and return an image."
(let ((buffer (url-retrieve-synchronously url)))
(unwind-protect
(let ((data (with-current-buffer buffer
(goto-char (point-min))
(search-forward "\n\n")
(buffer-substring (point) (point-max)))))
(insert "\n")
(insert-image (create-image data nil t)))
(kill-buffer buffer))))
(defun mastodon-media--select-next-media-line ()
"Find coordinates of a line that contains `Media_Links::'
Returns the cons of (`start' . `end') points of that line or nil no
more media links were found."
(let ((foundp (search-forward-regexp "Media_Link::" nil t)))
(when foundp
(let ((start (progn (move-beginning-of-line nil) (point)))
(end (progn (move-end-of-line nil) (point))))
(cons start end)))))
(defun mastodon-media--valid-link-p (link)
"Checks to make sure that the missing string has
not been returned."
(let((missing "/files/small/missing.png"))
(not(equal link missing))))
(defun mastodon-media--line-to-link (line-points)
"Returns the url of the media link given at the given point.
`LINE-POINTS' is a cons of (`start' . `end') positions of the line with
the `Media_Link:: <url>' text."
(replace-regexp-in-string "Media_Link:: " ""
(buffer-substring
(car line-points)
(cdr line-points))))
(defun mastodon-media--delete-line (line)
"Deletes the current media line"
(delete-region (car line) (cdr line)))
(defun mastodon-media--inline-images ()
"Find all `Media_Links:' in the buffer replacing them with the referenced image."
(interactive)
(goto-char (point-min))
(let (line-coordinates)
(while (setq line-coordinates (mastodon-media--select-next-media-line))
(let ((link (mastodon-media--line-to-link line-coordinates)))
(when (mastodon-media--valid-link-p link)
(mastodon-media--image-from-url link)
(mastodon-media--delete-line line-coordinates))))))
(provide 'mastodon-media)
;;; mastodon-media.el ends here
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