From 2af840342c242fe1f40f033936d3eaa9e7a9aab5 Mon Sep 17 00:00:00 2001
From: Yuchen Pei <id@ypei.org>
Date: Sat, 1 Jul 2023 23:55:05 +1000
Subject: Adding more faces to wiki mode, as well as rendering the links

like in org mode
---
 emacs/.emacs.d/lisp/my/wiki-faces.el | 31 +++++++++++++++
 emacs/.emacs.d/lisp/my/wiki.el       | 74 ++++++++++++++++++++++++++++++++----
 2 files changed, 97 insertions(+), 8 deletions(-)

(limited to 'emacs')

diff --git a/emacs/.emacs.d/lisp/my/wiki-faces.el b/emacs/.emacs.d/lisp/my/wiki-faces.el
index 2c35722..00a346a 100644
--- a/emacs/.emacs.d/lisp/my/wiki-faces.el
+++ b/emacs/.emacs.d/lisp/my/wiki-faces.el
@@ -73,5 +73,36 @@
 (defvar wiki-level-6 'wiki-level-6
   "Face used for level 6 headlines.")
 
+(defface wiki-hr-face '((t :inherit font-lock-builtin-face))
+  "Wiki hrule face")
+
+(defvar wiki-hr-face 'wiki-hr-face
+  "Wiki hrule face")
+
+(defface wiki-bold-italic '((t :inherit bold-italic))
+  "Wiki bold-italic face")
+
+(defvar wiki-bold-italic 'wiki-bold-italic
+  "Wiki bold-italic face")
+
+(defface wiki-bold '((t :inherit bold))
+  "Wiki bold face")
+
+(defvar wiki-bold 'wiki-bold
+  "Wiki bold face")
+
+(defface wiki-italic '((t :inherit italic))
+  "Wiki italic face")
+
+(defvar wiki-italic 'wiki-italic "Wiki italic face")
+
+(defface wiki-pre-face '((t :inherit org-code)) "Wiki pre face")
+
+(defvar wiki-pre-face 'wiki-pre-face "Wiki pre face")
+
+(defface wiki-link '((t :inherit org-link)) "Wiki link face")
+
+(defvar wiki-link 'wiki-link "Wiki link face")
+
 (provide 'wiki-faces)
 ;;; wiki-faces.el ends here
diff --git a/emacs/.emacs.d/lisp/my/wiki.el b/emacs/.emacs.d/lisp/my/wiki.el
index 2aace73..468244c 100644
--- a/emacs/.emacs.d/lisp/my/wiki.el
+++ b/emacs/.emacs.d/lisp/my/wiki.el
@@ -27,23 +27,81 @@
 ;;; Code:
 (require 'wiki-faces)
 
+(defvar wiki-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 "^======.*======\\ *$" 'wiki-level-6)
+   (cons "^=====.*=====\\ *$" '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)
+   ;; FIXME: not working, need to do something like `org-activate-links'
+   (cons "\\(\\[\\[\\)\\([^][|]+\\)\\(|\\)\\([^][|]+\\)\\(\\]\\]\\)"
+         '((1 invisible)
+           (2 invisible)
+           (3 invisible)
+           (4 wiki-link)
+           (5 invisible)))
    ))
+(defvar wiki-font-lock-keywords nil)
+
+(defvar wiki-outline-regexp "=+.*=+\ *$")
+
+(defun wiki-outline-level ()
+  (when (looking-at "\\(=+\\).*\\(=+\\)\ *$")
+    (min (length (match-string 1))
+         (length (match-string 2))
+         6)))
+
+;; `org-activate-links'
+(defun wiki-activate-links ()
+  (save-excursion
+    (goto-char (point-min))
+    (while (re-search-forward wiki-link-re nil t)
+      (let ((matched (match-data))
+            (target (match-string 1))
+            (maybe-label (match-string 2)))
+        (put-text-property
+         (nth 0 matched)
+         (nth (if maybe-label 4 2) matched)
+         'invisible t)
+        (put-text-property
+         (nth (if maybe-label 5 3) matched)
+         (nth 1 matched)
+         'invisible t)
+        (put-text-property
+         (nth (if maybe-label 4 2) matched)
+         (nth (if maybe-label 5 3) matched)
+         'font-lock-face 'wiki-link)))))
 
-(define-derived-mode wiki-mode text-mode "Wiki"
+(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 nil)))
+  ;; FIXME: this should not be necessary in outline mode
+  (setq-local font-lock-defaults '(wiki-font-lock-keywords t nil nil nil))
+  (setq-local outline-regexp wiki-outline-regexp)
+  (setq-local outline-level 'wiki-outline-level)
+  (wiki-activate-links))
 
 (provide 'wiki)
 ;;; wiki.el ends here
-- 
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