Scheme In One Defun, or humorously Scheme In One Day (SIOD) is a programming language, a dialect of the language Lisp, a small-size implementation of the dialect Scheme, written in C and designed to be embedded inside C programs. It is notable for being perhaps the smallest practical implementation of a Lisp-like language. It was written by George J. Carrette originally. It is free and open-source software released under a GNU Lesser General Public License (LGPL).

Since version 1.0 of GIMP, it has included a powerful scripting language which permits extending the program’s capabilities and simplifying repetitive tasks. This scripting language, called “Script-fu”, was based upon the Scheme programming language and implemented the SIOD interpreter written by George J. Carrette while he was a ...

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