Hpack is a format for Haskell packages. It is an alternative to the Cabal package format and follows different design principles. Hpack packages are described in a file named package.yaml. Both cabal2nix and stack support package.yaml natively. For other build tools the hpack executable can be used to generate a .cabal file from package.yaml.

inline-c lets you seamlessly call C libraries and embed high-performance inline C code in Haskell modules. Haskell and C can be freely intermixed in the same source file, and data passed to and from code in either language with minimal overhead. No FFI required.

This package provides various extra monoid-related definitions and utilities, such as monoid actions, monoid coproducts, semi-direct products, "deletable" monoids, "split" monoids, and "cut" monoids.

This Haskell package supports the definition of generic functions. Datatypes are viewed in a uniform, structured way: the choice between constructors is represented using an n-ary sum, and the arguments of each constructor are represented using an n-ary product.

A UTF8 layer for Strings. The utf8-string package provides operations for encoding UTF8 strings to Word8 lists and back, and for reading and writing UTF8 without truncation.

This is a pretty printing library based on Wadler's paper "A Prettier Printer". It has been enhanced with support for ANSI terminal colored output using the ansi-terminal package.

ANSI terminal backend for the prettyprinter package.

wordexp(3) wrapper library for Haskell to perform word expansion like a posix-shell.

This package provides Prism and Traversals for These.

This package provides functions to fork threads and wait for their result, whether it's an exception or a normal value. Besides waiting for the termination of a single thread this package also provides functions to wait for a group of threads to terminate. This package is similar to the threadmanager, async and spawn packages. The advantages of this package are:

• Simpler API.

• More efficient in both space and time.

• No space-leak when forking a large number of threads.

• Correct handling of asynchronous exceptions.

• GHC specific functionality like forkOn and forkIOWithUnmask.

This package provides bindings and types to bridge Haskell and <https://www.lua.org/ Lua>. . The full Lua interpreter version 5.4.4 is included. Alternatively, a system-wide Lua installation can be linked instead.

Implementation of bidirectional TOML serialization.

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

This package allows you to work with WAVE and RF64 files in Haskell.

This package provides a library that performs fast, accurate conversion between double precision floating point and text.

The Union/Find algorithm implements these operations in (effectively) constant-time:

1. Check whether two elements are in the same equivalence class.

2. Create a union of two equivalence classes.

3. Look up the descriptor of the equivalence class.

This package provides a backend for the ghc-persistent library using the ghc-postgresql-simple package.

PCG is a family of simple fast space-efficient statistically good algorithms for random number generation. Unlike many general-purpose RNGs, they are also hard to predict. . This library implements bindings to the standard C implementation. This includes the standard, unique, fast and single variants in the pcg family. There is a pure implementation that can be used as a generator with the random package as well as a faster primitive api that includes functions for generating common types. . The generators in this module are suitable for use in parallel but make sure threads don't share the same generator or things will go horribly wrong.

This package provides a Haskell library for setting environment variables.

The threadDelay and timeout functions from the Haskell base library use the bounded Int type for specifying the delay or timeout period. This package provides alternative functions which use the unbounded Integer type.

Haskeline wrapper for GHCi-like REPL interfaces. Composable with normal mtl transformers.

This package provides a drop-in replacement for the standard filepath library, operating on RawFilePath values rather than FilePath values to get the speed benefits of using ByteStrings.

MissingH is a library of all sorts of utility functions for Haskell programmers. It is written in pure Haskell and thus should be extremely portable and easy to use.

This library provides opaque unique identifiers in primitive state monads and a GADT-like type using them as witnesses of type equality.