| It highlights comments, strings and matching parens as you type, and provides commandline history (caveats below). Particularly useful in learning situations if someone doesn't have readline libraries at hand (like on a mac without homebrew/macports) since it requires no dependencies besides anarki. Screenshot: http://i.imgur.com/yrm9Zei.png I must add that it has many issues. Off the top of my head, history isn't persistent. You can use up/down to navigate history but not left/right to edit a line. You have to backspace. It's super slow because it's an example app for my new project[1]. Up arrow loses anything you'd already typed in. And on and on. But if you still want to try it out: $ git clone http://github.com/akkartik/mu
$ cd mu
$ git clone http://github.com/arclanguage/anarki
$ ./mu color-repl.mu
[1] http://github.com/akkartik/mu, which allows me to write automated tests for interactive terminal programs using blocking I/O. Incidentally, one of the interesting things about mu is that it implements first-class continuations independently of arc/racket's call/cc. Continuations turn out to be particularly easy to understand/use in an imperative/assembly context. I just broke call-with-current-continuation into two operators: current-continuation which returns a value of type continuation and continue-from which takes a continuation as argument. I find them easier to reason about: all they do is save and restore the call stack, and they're easily generalizable to delimited versions as well. Perhaps call/cc is what Rich Hickey calls complected or not simple? A simple example, though it will require reading the project Readme first: https://github.com/akkartik/mu/blob/cf6264d300/callcc.mu. One huge caveat: mu currently has no GC or even free. The longer it runs the more memory it consumes. Continuations will eventually complicate memory management to perhaps an unjustifiable degree. |
