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+;;; youtube-stream.el --- Open YouTube stream video and chat
+
+;; Copyright © 2018 Oleg Pykhalov <go.wigust@gmail.com>
+
+;; This file is part of Emacs-youtube-stream.
+
+;; Emacs-YouTube-stream 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.
+;;
+;; Emacs-YouTube-stream 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 Emacs-YouTube-stream.
+;; If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This file provides `youtube-stream-open', the function to open
+;; YouTube stream video and live chat.
+
+;;; Code:
+
+(defgroup youtube-stream nil
+  "Settings for `youtube-stream'."
+  :prefix "youtube-stream-"
+  :group  'youtube-stream)
+
+(defcustom youtube-stream-url-regexp
+  (rx "http" (zero-or-one "s") "://"
+      (zero-or-one "www.") "youtube.com")
+  "Regexp matching YouTube URL."
+  :type 'regexp
+  :group 'youtube-stream)
+
+(defcustom youtube-stream-video-id-url-regexp
+  (concat youtube-stream-url-regexp
+          (rx "/watch?v=" (group (one-or-more alphanumeric))))
+  "Regexp matching Youtube video ID URL."
+  :type 'regexp
+  :group 'youtube-stream)
+
+(defcustom youtube-stream-open-chat-function #'browse-url
+  "Function to open YouTube live chat."
+  :type 'function
+  :group 'youtube-stream)
+
+(defcustom youtube-stream-open-video-function #'browse-url
+  "Function to open YouTube stream."
+  :type 'string
+  :group 'youtube-stream)
+
+(defcustom youtube-stream-open-video t
+  "If `t' open YouTube video in `youtube-stream-stream-player'."
+  :type 'boolean
+  :group 'youtube-stream)
+
+(defcustom youtube-stream-open-chat t
+  "If `t' open YouTube live chat in `youtube-stream-stream-browser'."
+  :type 'boolean
+  :group 'youtube-stream)
+
+(defcustom youtube-stream-live-chat-url-template
+  "https://www.youtube.com/live_chat?v=%s&is_popout=1"
+  "URL template used in `youtube-stream-live-chat-url'."
+  :type 'string
+  :group 'youtube-stream)
+
+(defcustom youtube-stream-video-url-template
+  "https://www.youtube.com/watch?v=%s"
+  "URL template used id `youtube-stream-video-url'")
+
+(defun youtube-stream-get-id (url)
+  "Return video id from YouTube URL."
+  (string-match youtube-stream-video-id-url-regexp url)
+  (match-string 1 url))
+
+(defun youtube-stream-live-chat-url (id)
+  "Return a YouTube live chat URL from ID."
+  (format youtube-stream-live-chat-url-template id))
+
+(defun youtube-stream-video-url (id)
+  "Return a YouTube video URL from ID."
+  (format youtube-stream-video-url-template id))
+
+(defun youtube-stream-quote-url (url)
+  "Return a quoted URL."
+  (format "\"%s\"" url))
+
+(defun youtube-stream-open (url)
+  "Open YouTube live chat from URL
+
+Use YouTube video URL present from a GUI clipboard if available."
+  (interactive
+   (let ((clipboard (x-get-clipboard)))
+     (list
+      (if (string-match-p youtube-stream-video-id-url-regexp
+                          clipboard)
+          clipboard
+        (read-string "YouTube URL: ")))))
+  (let ((id (youtube-stream-get-id url)))
+    (if youtube-stream-open-chat
+        (funcall youtube-stream-open-chat-function
+                 (youtube-stream-live-chat-url id)))
+    (if youtube-stream-open-video
+        (funcall youtube-stream-open-video-function
+                 (youtube-stream-video-url id)))))
+
+(provide 'youtube-stream)
+
+;;; youtube-stream.el ends here