;;; jao-embark-targets.el --- embark actions                 -*- lexical-binding: t; -*-

;; Copyright (C) 2021  jao

;; Author: jao <mail@jao.io>
;; Keywords: convenience

;; This program 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.

;; This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; Embark targets and actions

;;; Code:

(require 'embark)

(declare-function w3m-anchor "w3m")
(declare-function org-link-any-re "ol")
(declare-function org-open-link-from-string "ol")
(declare-function org-in-regexp "org-macs")

(defun jao-embark-targets--org-link ()
  (when (derived-mode-p 'org-mode)
    (when (org-in-regexp org-link-any-re)
      (let ((lnk (match-string-no-properties 2)))
        (if (string-match-p "http://.+" lnk)
            (cons 'url lnk)
          (cons 'org-link (match-string-no-properties 0)))))))

(embark-define-keymap jao-embark-targets-org-link-map
  "Actions for org links"
  ((kbd "RET") org-open-link-from-string))

(add-to-list 'embark-target-finders #'jao-embark-targets--org-link)
(add-to-list 'embark-keymap-alist '(org-link . jao-embark-targets-org-link-map))

(defvar jao-embark-targets-video-url-rx
  (format "^https?://\\(?:www\\.\\)?%s/.+"
          (regexp-opt '("youtu.be"
                        "youtube.com"
                        "blip.tv"
                        "vimeo.com"
                        "infoq.com")
                      t))
  "A regular expression matching URLs that point to video streams")

(defun jao-embark-targets--w3m-anchor ()
  (when (not (region-active-p))
    (when-let ((url (or (w3m-anchor) w3m-current-url)))
      (cons 'url url))))

(defun jao-embark-targets--refine-url (url)
  (if (string-match-p jao-embark-targets-video-url-rx url)
      (cons 'video-url url)
    (cons 'url url)))

(defun jao-embark-targets--play-video (player url)
  (interactive "sURL: ")
  (let ((cmd (format "%s %s" player (shell-quote-argument url))))
    (start-process-shell-command player nil cmd)))

(defun jao-embark-targets-mpv (&optional url)
  "Play video stream with mpv"
  (interactive "sURL: ")
  (jao-embark-targets--play-video "mpv" url))

(defun jao-embark-targets-vlc (&optional url)
  "Play video stream with vlc"
  (interactive "sURL: ")
  (jao-embark-targets--play-video "vlc" url))

(embark-define-keymap jao-embark-targets-video-url-map
  "Actions on URLs pointing to remote video streams."
  :parent embark-url-map
  ("v" jao-embark-targets-vlc)
  ("m" jao-embark-targets-mpv))

(define-key embark-url-map (kbd "f") #'browse-url-firefox)

(add-to-list 'embark-target-finders #'jao-embark-targets--w3m-anchor)
(add-to-list 'embark-transformer-alist '(url . jao-embark-targets--refine-url))
(add-to-list 'embark-keymap-alist '(video-url . jao-embark-targets-video-url-map))

(provide 'jao-embark-targets)
;;; jao-embark-targets.el ends here