A hook, in the present context, is a certain kind of extension point in a program that allows interleaving the execution of arbitrary code with the execution of a the program without introducing any coupling between the two. Hooks are used extensively in the extensible editor Emacs.

In the Common LISP Object System (CLOS), a similar kind of extensibility is possible using the flexible multi-method dispatch mechanism. It may even seem that the concept of hooks does not provide any benefits over the possibilities of CLOS. However, there are some differences:

• There can be only one method for each combination of specializers and qualifiers. As a result this kind of extension point cannot be used by multiple extensions independently.

• Removing code previously attached via a :before, :after or :around method can be cumbersome.

• There could be other or even multiple extension points besides :before and :after in a single method.

• Attaching codes to individual objects using eql specializers can be cumbersome.

• Introspection of code attached a particular extension point is cumbersome since this requires enumerating and inspecting the methods of a generic function.

This library tries to complement some of these weaknesses of method-based extension-points via the concept of hooks.

This package implements an algorithm for the spelling of enharmonics and dealing with ties and dots in rhythm notation.

cl-flamegraph is a wrapper around SBCL's statistical profiler. It saves stack traces of profiled code in a form suitable for processing by the flamegraph.pl script, which is available in the Guix package flamegraph.

trivial-download allows you to download files from the Internet from Common Lisp. It provides a progress bar.

This library provides low-level libuv bindings for Common Lisp.

Additional dolist style macros for Common Lisp, such as doalist, dohash, dolist*, doplist, doseq and doseq*.

cl-pass is a password hashing and verification library.

Maiden is a collection of systems to help you build applications and libraries that interact with chat servers. It can help you build a chat bot, or a general chat client. It also offers a variety of parts that should make it much easier to write a client for a new chat protocol.

S-XML-RPC is an implementation of XML-RPC in Common Lisp for both client and server.

Infix-Math is a library that provides a special-purpose syntax for transcribing mathematical formulas into Lisp.

This package creates GraphViz DOT files from an equivalent s-expression representation.

Coalton is a dialect of ML embedded in Common Lisp. It emphasizes practicality and interoperability with Lisp, and is intended to be a DSL that allows one to gradually make their programs safer.

There are plenty of Lisp Markup Languages out there - every Lisp programmer seems to write at least one during his career - and CL-WHO (where WHO means "with-html-output" for want of a better acronym) is probably just as good or bad as the next one.

This is a simple extension to MODULARIZE that allows modules to define and trigger hooks, which other modules can hook on to.

repl-utilities is a set of utilities which ease life at the REPL. It includes three sorts of features: introspective procedures, miscellaneous utility functions, and, pulling them together, methods to conveniently keep these symbols and optionally additional symbols available in whichever package you switch to.

This package provides a collection of types, functions and macros. Some of the functionality is implemented from Graham's On Lisp and Seibel's Practical Common Lisp.

This package provides a Common Lisp system which has only one function to return the CPU count of the current system.

Periods is a Common Lisp library providing a set of utilities for manipulating times, distances between times, and both contiguous and discontiguous ranges of time.

RESTAS is a Common Lisp web application framework.

This library provides functions for determining the value types of Common Lisp forms, based on type information contained in the environment.

In order for this library to work the values types of variables and return types of functions have to be declared.

Macros and symbol-macros are fully expanded and all special forms, except CATCH, are supported.

Parse-js is a Common Lisp package for parsing JavaScript (ECMAScript 3). It has basic support for ECMAScript 5.

A client for the Stripe payment API.

charje.lambda-list can parse every kind of lambda list defined in the ANSI Common Lisp standard. Parsing yields only one object that has all the parsed parts of the lambda list inside. New kinds of lambda lists can be made too.

This package provides CFFI bindings to convert between different character encodings using iconv.