Initial commit

README.org

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+#+TITLE:   owo-mode
+#+STARTUP: indent nofold
+
+This obnoxious minor-mode uses overlays to owo-ify the text being displayed in
+the buffer. It does not alter the actual text in any way, it is purely cosmetic.
+Think of it as glasses-mode for weirdos.

owo-mode.el

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+;;; owo-mode.el --- Minor mode for studying kanji
+
+;; Copyright (C) 2020 Correl Roush
+
+;; Author: Correl Roush <correl@gmail.com>
+;; Version: 1.0
+;; Created: 2018-05-15
+;; Package-Requires: ((seq "2.20"))
+
+;; This file is NOT part of GNU Emacs.
+
+;;; License:
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; This program 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 General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; This obnoxious minor-mode uses overlays to owo-ify the text being displayed
+;; in the buffer. It does not alter the actual text in any way, it is purely
+;; cosmetic. Think of it as glasses-mode for weirdos.
+
+;;; Code:
+
+(require 'seq)
+
+(defvar owo-table
+  '(("l\\|r" . "w")
+    ("n\\([aeiou]\\)" . "ny\\1")))
+
+(defun owo-translate (text)
+  "Translate TEXT into OwO dribble."
+  (seq-reduce (lambda (acc pair)
+                (replace-regexp-in-string (car pair) (cdr pair) acc))
+              owo-table
+              text))
+
+(defun owo-set-overlay-properties ()
+  "Set properties of kanji overlays."
+  (put 'owo 'evaporate t)
+  (put 'owo 'face '(bold highlight)))
+
+(owo-set-overlay-properties)
+
+(defun owo-overlay-p (overlay)
+  "Return whether OVERLAY is an overlay of owo mode."
+  (eq (overlay-get overlay 'category)
+      'owo))
+
+(defun owo-wipe (start end)
+  "Clear owo overlays between START and END."
+  (dolist (overlay (overlays-in start end))
+    (when (owo-overlay-p overlay)
+      (delete-overlay overlay))))
+
+(defun owo-adjust (start end)
+  "Apply owo to the region defined by START and END."
+
+  (let ((pattern (concat "\\(" (mapconcat #'car owo-table "\\|") "\\)"))
+        (case-fold-search nil))
+    (save-excursion
+      (save-match-data
+        (goto-char start)
+        (while (re-search-forward pattern)
+          (message "OwO...%s" (match-string 1))
+          (let ((overlay (make-overlay (match-beginning 1) (match-end 1))))
+            (overlay-put overlay 'category 'owo)
+            (overlay-put overlay 'invisible t)
+            (overlay-put overlay 'after-string
+                         (owo-translate (match-string 1)))))
+        ))))
+
+(defun owo-change (start end)
+  "Fontification function to be registered to `jit-lock'.
+Clears and re-applies owo overlays to the region
+defined by START and END."
+  (let ((start-line (save-excursion (goto-char start) (line-beginning-position)))
+        (end-line (save-excursion (goto-char end) (line-end-position))))
+    (owo-wipe start-line end-line)
+    (owo-adjust start-line end-line)))
+
+(define-minor-mode owo-mode
+  "OwO"
+  :lighter "OwO"
+  (owo-wipe (point-min) (point-max))
+  (if owo-mode
+      (progn
+        (jit-lock-register 'owo-change))
+    (jit-lock-unregister 'owo-change)))
+
+;;; owo-mode.el ends here