Scheme

2012-05-01T10:15:32Z

193.52.24.14: /* Quack */ Add section, link, description.

Scheme is a functional programming language of the [[lisp]] family. Praised for its minimalist design, Scheme also pioneers the [[lexical scope]], tail-call optimization and first class continuation.

== Implementation ==

=== Guile ===
[[Guile]] is the GNU Ubiquitous Intelligent Language for Extensions, the official extension language for the GNU operating system.

=== Racket ===
Formerly known as PLT Scheme

== Major Mode for editing Scheme ==
=== Scheme mode ===
Emacs has built-in Scheme Mode. It provides basic features, such as syntax highlighting etc.

=== Geiser ===
Geiser is a collection of Emacs major and minor mode, that can help Emacs to communicate to a foreign Scheme interpreter. It provides [[SLIME]]-like support for Racket and Guile.

Example config may look like this:
<syntaxhighlight lang="lisp">
(defun turn-on-parenthesis-goodies () (rainbow-delimiters-mode 1) (paredit-mode 1))
(add-hook 'scheme-mode-hook 'turn-on-parenthesis-goodies)
(load-file "C:/path-to-geiser/elisp/geiser.el")
(setq geiser-active-implementations '(racket))
(setq geiser-racket-binary "C:/path-to-racket/racket.exe")
(require 'quack)
</syntaxhighlight>

=== Quack ===
[http://www.neilvandyke.org/quack/ Quack] is a package that enhance Emacs support for Scheme. It supports many different interpreters such as Guile, Racket, etc. Geiser uses its own Quack version and, thus, makes Quack alone a good light alternative.

When you have installed it, you can add these lines to your .emacs file:
<syntaxhighlight lang="lisp">
;; The binary of your interpreter
(setq scheme-program-name "racket")

;; This hook lets you use your theme colours instead of quack's ones.
(defun scheme-mode-quack-hook ()
(require 'quack)
(setq quack-fontify-style 'emacs))
(add-hook 'scheme-mode-hook 'scheme-mode-quack-hook)
</syntaxhighlight>

== Minor Mode for editing Scheme ==

* [http://mumble.net/~campbell/emacs/paredit.el ParEdit] is a mode for structured editing of [[S-expression]]s. Useful with any Lisp.
* [https://github.com/jlr/rainbow-delimiters RainbowDelimiters] highlights parentheses, brackets, and braces according to their depth, each level in a different colour. Also available in [[ELPA]].

== Useful Links ==
* [http://docs.racket-lang.org/guide/Emacs.html Racket documentation on Emacs as IDE]

[[Category:Lisp]]

WikEmacs - User contributions [en]

Scheme