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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.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.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.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
;; Headers
(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 "^----+\\ *$" 'wiki-hr-face)
(cons "^ .*$" 'wiki-pre-face)
'(wiki-do-emphasis-faces)
'(wiki-activate-external-links)
'(wiki-activate-internal-links)
))
(defvar wiki-outline-regexp "=+.*=+\ *$")
(defvar-local wiki-site nil
"The identifier of the wiki site")
(defun wiki-follow-wikilink-action (data)
"Button action to follow a wikilink"
(funcall (wiki-site-fetcher wiki-site) (alist-get 'title data)))
(defun wiki-outline-level ()
(when (looking-at "\\(=+\\).*[^=]\\(=+\\)\\ *$")
(min (length (match-string 1))
(length (match-string 2))
6)))
;; Like `org-do-emphasis-faces'
(defun wiki-do-emphasis-faces (limit)
(while (re-search-forward "\\(''+\\)[^ \t\n].*?[^ \t\n']\\(''+\\)" limit t)
(let ((start (match-beginning 0))
(end (match-end 0)))
(pcase (min (length (match-string 1)) (length (match-string 2)))
(2 (add-face-text-property start end 'wiki-italic))
(3 (add-face-text-property start end 'wiki-bold))
(_ (add-face-text-property start end 'wiki-bold-italic))
))))
;; 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)))
(title (buffer-substring-no-properties (match-beginning 1)
(match-end 1)))
)
(put-text-property start visible-start 'invisible t)
(make-text-button start end
'action 'wiki-follow-wikilink-action
'button-data `((title . ,title)))
(add-face-text-property start end 'org-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 "-->")
(setq-local font-lock-defaults
'(wiki-font-lock-keywords
t
nil
nil
(font-lock-extra-managed-props
invisible font-lock-face button-data action category
button htmlize-link help-echo)))
(setq-local outline-regexp wiki-outline-regexp)
(setq-local outline-level 'wiki-outline-level)
)
(defun set-wiki-site (wiki-site)
(interactive (list
(completing-read "Set wiki site: "
(mapcar 'car wiki-sites))))
(setq-local wiki-site (intern wiki-site)))
(provide 'wiki-markup)
;;; wiki-markup.el ends here
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