sol/vimus — pull request #62 by supki (2013-10-10 20:21:59+00:00)
Title: Autocompletion that cycles through alternatives

Mimics Vim behavior, except it appends a space if
the command can be completed unambiguously, for some reason.

Algorithm is as follows:

* Suppose user has typed "foo" (so '^' is the cursor position):

```
:foo
^
```
* Then user presses :

```
:foo foobar foobaz
^
```
* Then user presses once more:

```
:foobar foobar foobaz
^
```
* And again:

```
:foobaz foobar foobaz
^
```
* Next press will return her to the start:

```
:foo foobar foobaz
^
```
* And then the cycle will repeat