7842 - new directory organization

Baremetal is now the default build target and therefore has its sources
at the top-level. Baremetal programs build using the phase-2 Mu toolchain
that requires a Linux kernel. This phase-2 codebase which used to be at
the top-level is now under the linux/ directory. Finally, the phase-2 toolchain,
while self-hosting, has a way to bootstrap from a C implementation, which
is now stored in linux/bootstrap. The bootstrap C implementation uses some
literate programming tools that are now in linux/bootstrap/tools.

So the whole thing has gotten inverted. Each directory should build one
artifact and include the main sources (along with standard library). Tools
used for building it are relegated to sub-directories, even though those
tools are often useful in their own right, and have had lots of interesting
programs written using them.

A couple of things have gotten dropped in this process:
  - I had old ways to run on just a Linux kernel, or with a Soso kernel.
    No more.
  - I had some old tooling for running a single test at the cursor. I haven't
    used that lately. Maybe I'll bring it back one day.

The reorg isn't done yet. Still to do:
  - redo documentation everywhere. All the README files, all other markdown,
    particularly vocabulary.md.
  - clean up how-to-run comments at the start of programs everywhere
  - rethink what to do with the html/ directory. Do we even want to keep
    supporting it?

In spite of these shortcomings, all the scripts at the top-level, linux/
and linux/bootstrap are working. The names of the scripts also feel reasonable.
This is a good milestone to take stock at.

1 files changed, 44 insertions, 0 deletions

diff --git a/editor/subx.el b/editor/subx.el
new file mode 100644
index 00000000..8d92c78e
--- /dev/null
+++ b/editor/subx.el
@@ -0,0 +1,44 @@
+;;; 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)