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+;;; wiki-markup.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 wiki-markup.el.
+
+;; wiki-markup.el 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.
+
+;; wiki-markup.el 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 wiki-markup.el.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; A wikitext mode for wiki-markup
+
+;;; Code:
+(require 'wiki-faces)
+
+(defvar wiki-url-regexp "https?://[^ ]+")
+
+(defvar wiki-external-link-re
+  (rx (seq "[["
+           (group (seq "http"
+                       (opt "s")
+                       "://"
+                       (+ (not " "))))
+           (opt (seq " " (group (+? anything))))
+           "]]")))
+
+(defvar wiki-internal-link-re
+  (rx (seq "[["
+	         ;; Target
+	         (group
+	          (one-or-more
+             (not (any "[|]"))))
+		       ;; Label (optional)
+		       (opt (seq "|" (group (+? anything))))
+		       "]]"))
+  )
+
+(defvar wiki-font-lock-keywords
+  (list
+   (cons "^======.*======\\ *$" 'wiki-level-6)
+   (cons "^=====.*=====\\ *$" 'wiki-level-5)
+   (cons "^====.*====\\ *$" 'wiki-level-4)
+   (cons "^===.*===\\ *$" 'wiki-level-3)
+   (cons "^==.*==\\ *$" 'wiki-level-2)
+   (cons "^=.*=\\ *$" 'wiki-level-1)
+   (cons "^----+\\ *$" 'wiki-hr-face)
+   (cons "'''''[^ \t\n].*?[^ \t\n]'''''" 'wiki-bold-italic)
+   (cons "'''[^ \t\n'].*?[^ \t\n']'''" 'wiki-bold)
+   (cons "''[^ \t\n'].*?[^ \t\n']''" 'wiki-italic)
+   (cons "^ .*$" 'wiki-pre-face)
+   '(wiki-activate-external-links)
+   '(wiki-activate-internal-links)
+   ))
+
+(defvar wiki-outline-regexp "=+.*=+\ *$")
+
+(defun wiki-outline-level ()
+  (when (looking-at "\\(=+\\).*\\(=+\\)\ *$")
+    (min (length (match-string 1))
+         (length (match-string 2))
+         6)))
+
+;; Like `org-activate-links'
+(defun wiki-activate-links (link-re limit)
+  (save-excursion
+    (goto-char (point-min))
+    (while (re-search-forward link-re limit t)
+      (let ((start (match-beginning 0))
+            (end (match-end 0))
+            (visible-start (or (match-beginning 2) (match-beginning 1)))
+            (visible-end (or (match-end 2) (match-end 1)))
+            )
+        (put-text-property start visible-start 'invisible t)
+        (put-text-property start end 'font-lock-face 'wiki-link)
+        (put-text-property visible-end end 'invisible t)
+        (add-text-properties (1- visible-start) visible-start
+                             '(rear-nonsticky (invisible)))
+        (add-text-properties (1- visible-end) visible-end
+                             '(rear-nonsticky (invisible)))
+        ))))
+
+(defun wiki-activate-internal-links (limit)
+  (wiki-activate-links wiki-internal-link-re limit))
+
+(defun wiki-activate-external-links (limit)
+  (wiki-activate-links wiki-external-link-re limit))
+
+(define-derived-mode wiki-mode outline-mode "Wiki"
+  "A wikitext mode."
+
+  (setq-local comment-start "<!--")
+  (setq-local comment-end "-->")
+
+  ;; FIXME: this should not be necessary in outline mode
+  (setq-local font-lock-defaults
+              '(wiki-font-lock-keywords
+                t
+                nil
+                nil
+                (font-lock-extra-managed-props invisible font-lock-face)))
+  (setq-local outline-regexp wiki-outline-regexp)
+  (setq-local outline-level 'wiki-outline-level)
+  )
+
+(provide 'wiki-markup)
+;;; wiki-markup.el ends here
+