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+;;; reddio.el -- reddit client through reddio -*- lexical-binding: t -*-
+
+;; Copyright (C) 2024  Free Software Foundation, Inc.
+
+;; Author: Yuchen Pei <id@ypei.org>
+;; Package-Requires: ((emacs "29.4"))
+
+;; This file is part of dotted.
+
+;; dotted is free software: you can redistribute it and/or modify it under
+;; the terms of the GNU Affero General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; dotted 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 Affero General
+;; Public License for more details.
+
+;; You should have received a copy of the GNU Affero General Public
+;; License along with dotted.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; reddit client through reddio.
+
+;;; Code:
+
+(defvar reddio-buffer "*reddio*")
+
+(defun reddio-open-url (url)
+  (interactive "sReddit link: ")
+  (when (string-match "/\\(comments/[^/]+\\)/" url)
+    (with-current-buffer (get-buffer-create reddio-buffer)
+      (let ((inhibit-read-only t))
+        (erase-buffer)
+        (when (= 0 (call-process "reddio" nil reddio-buffer nil "print"
+                                 (match-string 1 url)))
+          (goto-char (point-min)))
+        (delete-trailing-whitespace))
+      (text-mode)
+      (view-mode))
+    (display-buffer reddio-buffer)))
+
+(defun reddio-reddit-url-p (url)
+  "e.g.
+https://www.reddit.com/r/linux/comments/cs3os6/introducing_reddio_a_commandline_interface_for/"
+  (let ((urlobj (url-generic-parse-url url)))
+    (and (string-match-p "^.*\\<reddit.com$" (url-host urlobj))
+         (string-match-p "^/r/[^/]+/comments/[^/]+/.+$" (url-filename urlobj)))))
+
+(provide 'reddio)
+;;; reddio.el ends here