https://github.com/rmosolgo/crythtal

A Lisp in Crystal
https://github.com/rmosolgo/crythtal

Last synced: 3 months ago
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A Lisp in Crystal

• Host: GitHub
• URL: https://github.com/rmosolgo/crythtal
• Owner: rmosolgo
• Created: 2015-09-26T21:32:26.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2015-09-28T05:25:35.000Z (over 10 years ago)
• Last Synced: 2025-05-08T01:14:16.660Z (8 months ago)
• Language: Crystal
• Size: 152 KB
• Stars: 8
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

          
# Crythtal

A lisp in [Crystal](http://crystal-lang.org).

![image](https://cloud.githubusercontent.com/assets/2231765/10119967/9ff816be-645b-11e5-8311-b142f3536bce.png)

Cues taken from:

  - [Lispy tutorial](http://norvig.com/lispy.html), building a lisp in Python

  - [Crisp](https://github.com/rhysd/Crisp), another lisp in Crystal

## About

#### Try it

```

$ crystal src/lisp.cr -- run

Lisp REPL (cntl-d to quit):

>

```

#### Goals

- Learn Crystal ✓

- Implement a dynamic language ✓

- Do something with lisp for once ✓

#### Non-goals

- Implement a full-featured, useful lisp ✗

## Todo

- [x] Parse strings

- [x] Build expressions

- [x] Evaluate expressions in bindings

- [x] Lazy eval (`if`)

- [x] Modify current scope (`define`)

- [x] Lists (`quote`)

- [x] REPL

- [x] Custom functions (`lambda`)

- [ ] Implement all those cool lisp-y list functions

- [ ] Follow [Lispy2](http://norvig.com/lispy2.html)