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A practical implementation of the Scheme programming language for the Haskell Platform.

README.markdown

husk-scheme

Husk is a dialect of Scheme written in Haskell that implements a superset of the R5RS standard and a large portion of the R7RS-small language. Advanced features are provided including continuations, hygienic macros, libraries, and a full numeric tower.

Husk may be used as either a stand-alone interpreter or as an extension language within a larger Haskell application. By closely following the R5RS standard, the intent is to develop a Scheme that is as compatible as possible with other R5RS Schemes. Husk is mature enough for use in production applications, however it is not optimized for performance-critical applications.

Scheme is one of two main dialects of Lisp. Scheme follows a minimalist design philosophy: the core language consists of a small number of fundamental forms which may be used to implement other built-in forms. Scheme is an excellent language for writing small, elegant programs, and may also be used to write scripts or embed scripting functionality within a larger application.

More information is available on the husk website.

Installation

The Glasgow Haskell Compiler (GHC) is required to build, install, and run Husk. All recent versions of GHC are supported, including 7.0, 7.2, 7.4, and 7.6. The easiest way to get GHC is via the Haskell Platform.

Husk may be installed using cabal:

cabal update
cabal install husk-scheme

Before running Husk you may also need to add the cabal executable directory to your path. On Linux this is ~/.cabal/bin. Now you are ready to start up the interpreter:

justin@my-pc$ huski
  _               _        __                 _                          
 | |             | |       \\\               | |                         
 | |__  _   _ ___| | __     \\\      ___  ___| |__   ___ _ __ ___   ___  
 | '_ \| | | / __| |/ /    //\\\    / __|/ __| '_ \ / _ \ '_ ` _ \ / _ \ 
 | | | | |_| \__ \   <    /// \\\   \__ \ (__| | | |  __/ | | | | |  __/ 
 |_| |_|\__,_|___/_|\_\  ///   \\\  |___/\___|_| |_|\___|_| |_| |_|\___| 

 http://justinethier.github.com/husk-scheme                              
 (c) 2010-2012 Justin Ethier                                             
 Version 3.6.2 

huski> (define (hello) 'world)
(lambda () ...)
huski> (hello)
world

Husk has been tested on Windows, Linux, and FreeBSD.

Documentation

The online user manual provides an overview of the Scheme language as implemented by Husk, instructions for using the Haskell API, an alphabetical index of Scheme functions, and more.

License

Copyright (C) 2010 Justin Ethier

Husk scheme is available under the MIT license.

The interpreter is based on code from the book Write Yourself a Scheme in 48 Hours written by Jonathan Tang and hosted / maintained by Wikibooks.

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