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Environment for learning programming using Mu: http://akkartik.name/post/mu
Run it from the `mu` directory:
```shell
$ ./mu edit
```
This will load all the `.mu` files in this directory and then run the editor.
Press ctrl-c to quit. Press F4 to save your work (if a lesson/ directory
exists) and to run the contents of the sandbox editor on the right.
You can also run the tests for the environment:
```shell
$ ./mu test edit
```
You can also load the files more explicitly by enumerating them all:
```shell
$ ./mu edit/*.mu
```
This is handy if you want to run simpler versions of the editor so you can
stage your learning.
```shell
$ ./mu edit/00[12]*.mu # run a simple editor rather than the full environment
```
To see how the various 'layers' are organized, peek inside the individual
`.mu` files.
---
Appendix: keyboard shortcuts
_moving and scrolling_
- `ctrl-a` or `home`: move cursor to start of line
- `ctrl-e` or `end`: move cursor to end of line
- `ctrl-f` or `page-down`: scroll down by one page
- `ctrl-b` or `page-up`: scroll up by one page
- `ctrl-x`: scroll down by one line
- `ctrl-s`: scroll up by one line
- `ctrl-t`: scroll until current line is at top of screen
_modifying text_
- `ctrl-k`: delete text from cursor to end of line
- `ctrl-u`: delete text from start of line until just before cursor
- `ctrl-/`: comment/uncomment current line (using a special leader to ignore real comments https://www.reddit.com/r/vim/comments/4ootmz/_/d4ehmql)
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