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+;;; Emacs major mode for editing SubX files. -*- coding: utf-8; lexical-binding: t; -*-
+
+;; Author: Kartik Agaram (subx.el@akkartik.com)
+;; Version: 0.0.1
+;; Created: 28 Dec 2019
+;; Keywords: languages
+;; Homepage: https://github.com/akkartik/mu
+
+;;; Commentary:
+
+;; I don't know how to define new faces in an emacs package, so I'm
+;; cannibalizing existing faces.
+;;
+;; I load this file like so in my .emacs:
+;;    (load "/absolute/path/to/subx.el")
+;;    (add-to-list 'auto-mode-alist '("\\.subx" . subx-mode))
+;;
+;; Education on the right way to do this most appreciated.
+
+(setq subx-font-lock-keywords
+  '(
+    ; tests
+    ("^test-[^ ]*:" . font-lock-type-face)
+    ; functions
+    ("^[a-z][^ ]*:" . font-lock-function-name-face)
+    ; globals
+    ("^[A-Z][^ ]*:" . font-lock-variable-name-face)
+    ; minor labels
+    ("^[^a-zA-Z#( ][^ ]*:" . font-lock-doc-face)
+    ; string literals
+    ; ("\"[^\"]*\"" . font-lock-constant-face)  ; strings colorized already, albeit buggily
+    ; 4 colors for comments; ugly but functional
+    ("# \\. \\. .*" . font-lock-doc-face)
+    ("# \\. .*" . font-lock-constant-face)
+    ("# - .*" . font-lock-comment-face)
+    ("#.*" . font-lock-preprocessor-face)
+    ))
+
+(define-derived-mode subx-mode fundamental-mode "subx mode"
+  "Major mode for editing SubX (Mu project)"
+  (setq font-lock-defaults '((subx-font-lock-keywords)))
+  )
+
+(provide 'subx-mode)