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+;;; wiki.el -- A wikitext mode -*- lexical-binding: t -*-
+
+;; Copyright (C) 2023 Free Software Foundation.
+
+;; Author: Yuchen Pei <id@ypei.org>
+;; Package-Requires: ((emacs "28.2"))
+
+;; 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:
+
+;; A wikitext mode.
+
+;;; Code:
+(require 'parsec)
+
+(defun wiki-file ()
+  (parsec-many (wiki-block)))
+
+(defun wiki-block ()
+  (parsec-or (wiki-header)))
+
+(defun wiki-header ()
+  (let* ((marker (parsec-many-s (parsec-ch ?=)))
+         (raw-content
+          (string-trim
+           (parsec-many-till-s
+            (parsec-none-of ?\n)
+            (parsec-try
+             (parsec-and
+               (parsec-str marker)
+               (wiki-header-end)))))))
+    (list 'Header
+          (length marker)
+          (parsec-with-input raw-content
+            (wiki-inlines)))))
+
+(defun wiki-header-end ()
+  (parsec-and
+    (parsec-many (wiki-space))
+    (parsec-eol-or-eof)))
+
+(defun wiki-space ()
+  (parsec-one-of ?\s ?\t))
+
+(defun wiki-inlines ()
+  (parsec-many (wiki-inline)))
+
+(defun wiki-inline ()
+  (parsec-or (wiki-plain)))
+
+(defun wiki-plain ()
+  (list 'Plain (parsec-many1-as-string (parsec-any-ch))))
+
+(define-derived-mode wiki-mode text-mode "Wiki"
+  "A wikitext mode.")
+
+(provide 'wiki)
+;;; wiki.el ends here
+