The Newtype typeclass represents the packing and unpacking of a newtype, and allows you to operate under that newtype with functions such as ala. Generics support was added in version 0.4, making this package a full replacement for the original newtype package, and an alternative to newtype-th.

This library provides tools for ensuring that class members are shared.

A thread safe API to write a line of textual data to a Handle, such as sending some messages to the terminal - that has the following properties:

• Properly handle character encoding settings on the Handle

• For reasonably sized messages, ensure that the entire message is written in one chunk to avoid interleaving data with other threads

• Avoid unnecessary memory allocations and copies

• Minimize locking.

This Haskell library provides strict left folds that stream in constant memory, and you can combine folds using Applicative style to derive new folds. Derived folds still traverse the container just once and are often as efficient as hand-written folds.

This library implements mid-level Haskell bindings to the MySQL mysqlclient client library. It is aimed at speed and ease of use.

This package provides Haskell bindings to SDL2_image.

This Haskell package uses a monad transformer approach for logging.

This package provides Template Haskell functions for determining source code locations of messages.

This package provides a dependent sum is a generalization of a particular way of thinking about the Either type. Either a b can be thought of as a 2-tuple (tag, value), where the value of the tag determines the type of the value. In particular, either tag = Left and value :: a or tag = Right and value :: b. This package allows you to define your own dependent sum types by using your own "tag" types.

A Haskell 98 logically uninhabited data type, used to indicate that a given term should not exist.

This package defines a class for types with a default value, and provides instances for types from the base, containers, dlist and old-locale packages.

Get terminal window height and width without ncurses dependency.

Turtle is a reimplementation of the Unix command line environment in Haskell so that you can use Haskell as both a shell and a scripting language. Features include:

• Batteries included: Command an extended suite of predefined utilities.

• Interoperability: You can still run external shell commands.

• Portability: Works on Windows, OS X, and Linux.

• Exception safety: Safely acquire and release resources.

• Streaming: Transform or fold command output in constant space.

• Patterns: Use typed regular expressions that can parse structured values.

• Formatting: Type-safe printf-style text formatting.

• Modern: Supports text and system-filepath.

Read "Turtle.Tutorial" for a detailed tutorial or "Turtle.Prelude" for a quick-start guide. Turtle is designed to be beginner-friendly, but as a result lacks certain features, like tracing commands. If you feel comfortable using turtle then you should also check out the Shelly library which provides similar functionality.

This library provides various semigroups, specialized containers and a general map/reduce framework for Haskell.

This package provides a simple compatibility shim that lets you work with both binary and cereal with one chunk of serialization code.

This is a set of macros to be used when writing Haskell FFI. They were designed to be able to fully describe C interfaces, so that hsc2hs can extract from them all Haskell code needed to mimic such interfaces. All Haskell names used are automatically derived from C names, structures are mapped to Haskell instances of Storable, and there are also macros you can use with C code to help write bindings to inline functions or macro functions.

This Haskell library generates pretty hex dumps of ByteStrings in the style of other common *nix hex dump tools.

The module Data.CaseInsensitive provides the CI type constructor which can be parameterised by a string-like type like: String, ByteString, Text, etc. Comparisons of values of the resulting type will be insensitive to cases.

This Haskell library algorithms for vector arrays.

This module allows tokens produced by skylighting-core to be rendered as ANSI colored text.

This package provides Prism and Traversals for These.

This package provides extra instances for type-classes in the [indexed-traversable](https://hackage.haskell.org/package/indexed-traversable) package. . The intention is to keep this package minimal; it provides instances that formerly existed in @lens@ or @optics-extra@. We recommend putting other instances directly into their defining packages. The @indexed-traversable@ package is light, having only GHC boot libraries as its dependencies.

This is a library for testing code involving bottoms or infinite values. For the underlying theory and a larger example involving use of QuickCheck, see the article "Chasing Bottoms A Case Study in Program Verification in the Presence of Partial and Infinite Values".

This library provides extensible optionally-pure exceptions for Haskell.

Simple DirectMedia Layer (libSDL) is a cross-platform multimedia library designed to provide low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D video framebuffer. It is used by MPEG playback software, emulators, and many popular games, including the award winning Linux port of "Civilization: Call To Power."