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diff --git a/guix.scm b/guix.scm
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+;;; guix.scm --- Guix package for Emacs-YouTube-stream
+
+;; 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 contains Guix package for development version of
+;; Emacs-YouTube-stream.  To build or install, run:
+;;
+;;   guix build --file=guix.scm
+;;   guix package --install-from-file=guix.scm
+
+;; The main purpose of this file though is to make a development
+;; environment for building Emacs-YouTube-stream:
+;;
+;;   guix environment --pure --load=guix.scm
+
+;;; Code:
+
+(use-modules ((guix licenses) #:prefix license:)
+             (guix build utils)
+             (guix build-system emacs)
+             (guix gexp)
+             (guix git-download)
+             (guix packages)
+             (ice-9 popen)
+             (ice-9 rdelim))
+
+(define %source-dir (dirname (current-filename)))
+
+(define (git-output . args)
+  "Execute 'git ARGS ...' command and return its output without trailing
+newspace."
+  (with-directory-excursion %source-dir
+    (let* ((port   (apply open-pipe* OPEN_READ "git" args))
+           (output (read-string port)))
+      (close-port port)
+      (string-trim-right output #\newline))))
+
+(define (current-commit)
+  (git-output "log" "-n" "1" "--pretty=format:%H"))
+
+(define emacs-youtube-stream
+  (let ((commit (current-commit)))
+    (package
+      (name "emacs-youtube-stream")
+      (version (string-append "0.0.1" "-" (string-take commit 7)))
+      (source (local-file %source-dir
+                          #:recursive? #t
+                          #:select? (git-predicate %source-dir)))
+      (build-system emacs-build-system)
+      (home-page "https://github.com/wigust/emacs-youtube-stream")
+      (synopsis "Open YouTube stream video and live chat")
+      (description "This package provides an Emacs function to open
+YouTube video and live chat in preferred programs.")
+      (license license:gpl3+))))
+
+emacs-youtube-stream
+
+;;; guix.scm ends here
diff --git a/youtube-stream.el b/youtube-stream.el
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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