This library can load and store images in PNG, Bitmap, JPEG, Radiance, TIFF and GIF formats.

This package contains the Control.Monad.Fail module providing the MonadFail class that became available in base-4.9.0.0 for older base package versions. This package turns into an empty package when used with GHC versions which already provide the Control.Monad.Fail module.

This Haskell library contains type definitions for Universally Unique Identifiers or UUIDs, and basic conversion functions.

This package provides a fully compliant Haskell 98 lexer.

th-reify-many provides functions for recursively reifying top level declarations. The main intended use case is for enumerating the names of datatypes reachable from an initial datatype, and passing these names to some function which generates instances.

This package provides a version of ghc-hspec-expectations generalized to MonadIO.

Lets multiple threads and external processes concurrently output to the console, without it getting all garbled up.

Built on top of that is a way of defining multiple output regions, which are automatically laid out on the screen and can be individually updated by concurrent threads. Can be used for progress displays etc.

This package provides a simple wrapper to show the used CPU time of monadic computation with an IO base.

The Scripting.Lua module is a wrapper of the Lua language interpreter as described in https://www.lua.org/.

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.

Cross platform library for file creation, modification, and deletion notification. This library builds upon existing libraries for platform specific Windows, Mac, and Linux file system event notification.

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 a library for parallel programming.

The options package lets library and application developers easily work with command-line options.

This library provides fast base64 encoding and decoding for Haskell ByteStrings.

This package provides a parser and pretty printer for converting between Haskell values and JSON. JavaScript Object Notation is a lightweight data-interchange format.

This library provides a type for specifying Optional function arguments.

Skylighting is a syntax highlighting library with support for over one hundred languages. It derives its tokenizers from XML syntax definitions used by KDE's KSyntaxHighlighting framework, so any syntax supported by that framework can be added. An optional command-line program is provided. Skylighting is intended to be the successor to highlighting-kate.

A priority search queue efficiently supports the operations of both a search tree and a priority queue. A Binding is a product of a key and a priority. Bindings can be inserted, deleted, modified and queried in logarithmic time, and the binding with the least priority can be retrieved in constant time. A queue can be built from a list of bindings, sorted by keys, in linear time.

This package provides functions to prevent or capture writing to stdout and other handles.

This library provides fast parsing and formatting utilities for Unix time in Haskell.

This Haskell package provides three useful generalizations:

class Functor f => FunctorWithIndex i f | f -> i where
  imap :: (i -> a -> b) -> f a -> f b

class Foldable f => FoldableWithIndex i f | f -> i where
  ifoldMap :: Monoid m => (i -> a -> m) -> f a -> m

class (FunctorWithIndex i t, FoldableWithIndex i t, Traversable t)
       => TraversableWithIndex i t | t -> i where
  itraverse :: Applicative f => (i -> a -> f b) -> t a -> f (t b)

The ghc-keys package provides similar functionality, but uses associated TypeFamilies instead of FunctionalDependencies.

This package provides a type-safe tool for generating XML code via quasi-quoting built on top of ghc-shakespeare.

This package provides instances defined in later versions of ghc-binary package.