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+-------+---+ +-------+-------+-------+ | | | | | | | | +-+ | +---+ +-+ | +----+ +-+ | | | +--+ | | | | | | | | | | +-+ | | | +-+ | +-- | +-+ | | | | | | | | +-------+---+ +-------+-------+-------+ +---+ Chicken + Logo = Chogo! Chogo is a Logo interpreter written in Chicken Scheme. .[!]. CURRENT STATUS Very much a work in progress, but usable (if you know what you're doing ;-). .[!]. REQUIREMENTS - Chicken Scheme, obviously. ;-) Current version used for development is 4.6.0. Other versions may or may not work. See: [http://www.call-with-current-continuation.org/] - Eggs: - miscmacros - args - tk (if you want turtle graphics) - rlwrap (optional, but useful if you want a readline-enabled REPL) See: [http://utopia.knoware.nl/~hlub/rlwrap/] .[!]. RATIONALE I am writing Chogo for personal use; to learn more about language implementation, and to have a Logo interpreter that I can use with the book _Turtle_Geometry_. (Note that Chogo's syntax is *not* the same as the pseudocode used in the book, though. Much like all other Logo implementations, it has its own unique syntax. I will write more about this when/if the project matures a bit. There won't be *that* much of a difference, though.) (See: Turtle Geometry: The Computer as a Medium for Exploring Mathematics, by Albelson & diSessa. [http://www.amazon.com/dp/0262510375]) .[!]. QUICK START Assuming you have rlwrap installed, and you are on an Unixoid system, you can run the included 'chogo' script (which is really a one-liner at the moment, but should become more sophisticated in the future :-). Otherwise, just run chogo.scm with csi: $ csi -ss chogo.scm Load and execute a file: $ ./chogo <filename> or $ csi -ss chogo.scm <filename> Create a new canvas for turtle drawing using the REPL, and start drawing: > canvas 500 500 > forward 90 (Currently the turtle itself is not displayed... like I said, it's very much a work in progress.)