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INTRODUCTION This is a Nu version of the code from Doug Hoyte's excellent book "Let Over Lambda". The book is focused on harnessing the power of Lisp macros. If you want to hone your macro-fu, this is a great book to read. The book uses and builds on many of the ideas in Paul Graham's book "On Lisp", so it would be helpful to be familiar with "On Lisp" first. You can find more information about Doug Hoyte's book at http://letoverlambda.com. I didn't try to port any of the Common Lisp reader macros, as Nu doesn't currently have a reader macro facility. Also, I didn't use Hoyte's defmacro! enhancement. defmacro! adds two main features to Common Lisp's defmacro: 1. Ability to use gensyms without first declaring them (g!xxx syntax). 2. Ability to declaratively enforce once-only evaluation of macro parameters (o!xxx syntax). Nu's macro facility already has feature 1. And feature 2 is only a slight amount of syntactic sugar over a let form, so I just use the lets where needed. I'm sure you get used to seeing the o!xxx syntax, but I actually like seeing the evaluation steps of the macro arguments. HOW TO USE There are 3 files of "pure code": 1. cl_utils.nu - Common Lisp functions that aren't part of Nu. 2. with_test.nu - Macros that wrap NuTestCase. The benefit of doing this is that you can set the variable "show-verbose-output" to t in either with_test.nu or in any of your test_xxx.nu files, and when you run the test cases, you'll see the code and output of each assert_equals statement. 3. let_over_lambda.nu - Example functions and macros from the book. There are 2 files that exercise the above code: 1. test_cl_utils.nu - examples for the functions and macros in cl_utils.nu. 2. test_let_over_lambda.nu - examples from the functions and macros in let_over_lambda.nu. You can run all of the test cases in both test_xxx files running "nuke" ("test" is the default target). To make it interesting, set show-verbose-output to t in with_test.nu so you can see each line of code that's being tested along with the result. The test code in the test_xxx.nu files are in the same order as the functions and macros in the respective xxx.nu files, so it's pretty easy to follow along. I usually open up one of the test_xxx.nu files in TextMate (with the Nu bundle installed) and Shift-Command-R to run the unit tests. SYSTEM REQUIREMENTS This code requires Nu 0.4 or above. AUTHOR Doug Hoyte wrote the original Common Lisp code to accompany the book. The code is available at the book's web site. Jeff Buck ported the code to Nu, added some Common Lisp support functions that are not already in Nu, and added some enhancements to the utilities.