Exercism exercises in Lisp

Please be familiar with the contributing guide in the x-api repository. This describes how all the language tracks are put together, as well as details about the common metadata, and high-level information about contributing to existing problems and adding new problems.

Feel free to file any issues at https://github.com/exercism/common-lisp/issues for problems of any size. Feel free to report typographical errors or poor wording for example. You can greatly help improve the quality of the exercises by filing reports of invalid solutions that pass tests or of valid solutions that fail tests

Direct contributions to the Common Lisp code in xLisp are always welcome. Refer to the Getting Started Guide for the Common Lisp track to get your environment set up if needed.

New exercises or changes to existing ones can be submitted via a pull request. You will need a GitHub account and you will need to fork exercism/xlisp to your account. See GitHub Help if you are unfamiliar with the process.

All changes will be built under several implementations via the TravisCI build so it advisable to be able to run at least some of those same builds locally before submitting the changes.

A contributor will need to install:

• Roswell
• QuickLisp
• and a few Lisp implementations.

Instructions for installing Roswell can be found in its README.

It is beyond the scope of this document to describe how to install different Lisp implementations. Please find those instructions on those implementations' websites.

After installing Lisp implementations. Check that Roswell can see them by running ros list installed.

Although QuickLisp is required, Roswell will install and configure it for you, by default.

All new exercise submissions should contain not only the test file, but the stub of the "production code" (containing the defpackage and in-package forms), and a file example.lisp which contains an example implementation. The "production code" and example.lisp may also include an empty function declaration for the functions under test.

Before submitting a new exercise please ensure that it passes the Travis build. This build will run all exercises on many Common Lisp implementations. To run the build yourself on your implementation load bin/xlisp-test.lisp and then evaluate (xlisp-test:full-build).

If Roswell is installed then running all the tests for one implementation can be done with (this will return with a non-zero error code if there are problems):

ros run -l 'bin/xlisp-test.lisp' -e '(xlisp-test:travis-build)' -q

The example implementation should use nothing outside of the Common Lisp specification. It should be well designed and not too clever. (Save the clever implementation for your submission on Exercism.io.)