This Haskell library offers (among other things) the following selection of synchronisation primitives:

• Broadcast: Wake multiple threads by broadcasting a value.

• Event: Wake multiple threads by signalling an event.

• Lock: Enforce exclusive access to a resource. Also known as a binary semaphore or mutex. The package additionally provides an alternative that works in the STM monad.

• RLock: A lock which can be acquired multiple times by the same thread. Also known as a reentrant mutex.

• ReadWriteLock: Multiple-reader, single-writer locks. Used to protect shared resources which may be concurrently read, but only sequentially written.

• ReadWriteVar: Concurrent read, sequential write variables.

Please consult the API documentation of the individual modules for more detailed information.

This package was inspired by the concurrency libraries of Java and Python.

This Haskell package is intended for those who are tired of keeping long lists of dependencies to the same essential libraries in each package as well as the endless imports of the same APIs all over again.

It also supports the modern tendencies in the language.

To solve those problems this package does the following:

• Reexport the original APIs under the Rebase namespace.

• Export all the possible non-conflicting symbols from the Rebase.Prelude module.

• Give priority to the modern practices in the conflicting cases.

The policy behind the package is only to reexport the non-ambiguous and non-controversial APIs, which the community has obviously settled on. The package is intended to rapidly evolve with the contribution from the community, with the missing features being added with pull-requests.

Bindings to the Xft, X Free Type interface library, and some Xrender parts.

This library uses GHC.Generics to derive efficient optics (traversals, lenses and prisms) for algebraic data types in a type-directed way, with a focus on good type inference and error messages when possible. The library exposes a van Laarhoven interface. For an alternative interface, supporting an opaque optic type, see generic-optics.

This package provides the bytestring builder that is debuting in bytestring-0.10.4.0, which should be shipping with GHC 7.8. Compatibility package for older packages.

Safe Haskell introduced the notion of safe and unsafe modules. In order to make as many as possible modules ``safe'', the well-known unsafe functions were moved to distinguished modules. This makes it hard to write packages that work with both old and new versions of GHC. This package provides a single module System.Unsafe that exports the unsafe functions from the base package. It provides them in a style ready for qualification, that is, you should import them by import qualified System.Unsafe as Unsafe.

This package provides functions for converting emoji names to emoji characters and vice versa.

How does it differ from the emoji package?

• It supports a fuller range of emojis, including all those supported by GitHub

• It supports lookup of emoji aliases from emoji

• It uses Text rather than String

• It has a lighter dependency footprint: in particular, it does not require aeson

• It does not require TemplateHaskell

This package is a compatibility package for a singleton data type . > data Solo a = Solo a . Note: it's not a @newtype@ . @Solo@ is available in @base-4.16@ (GHC-9.2).

This package provides a simple text templating system used by pandoc.

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.

Takes an error-throwing expression and puts it back in the Maybe it belongs in.

Note that this suffers from the https://ghc.haskell.org/trac/ghc/ticket/5902. Buyer beware.

Atomically write to a file on POSIX-compliant systems while preserving permissions. mv is an atomic operation. This makes it simple to write to a file atomically just by using the mv operation. However, this will destroy the permissions on the original file. This library preserves permissions while atomically writing to a file.

This library provides a YAML 1.2 parser implementation for Haskell. Its features include:

• Pure Haskell implementation with small dependency footprint and emphasis on strict compliance with the YAML 1.2 specification.

• Direct decoding to native Haskell types via (aeson-inspired) typeclass-based API (see Data.YAML).

• Support for constructing custom YAML node graph representation (including support for cyclic YAML data structures).

• Support for the standard (untyped) Failsafe, (strict) JSON, and (flexible) Core ``schemas'' providing implicit typing rules as defined in the YAML 1.2 specification (including support for user-defined custom schemas).

• Event-based API resembling LibYAML's Event-based API (see Data.YAML.Event).

• Low-level API access to lexical token-based scanner (see Data.YAML.Token).

This package introduces a type for paths upholding useful invariants.

Prior to base-4.7.0.0 there was no Eq instance for ErrorCall. This package provides an orphan instance.

This package provides automatic formatting for Haskell files. Both a library and an executable.

This package provides low-dependency functionality commonly needed by various Haskell streaming data libraries, such as conduit and pipes.

SDL_image is an image file loading library. It loads images as SDL surfaces, and supports the following formats: BMP, GIF, JPEG, LBM, PCX, PNG, PNM, TGA, TIFF, XCF, XPM, XV.

This package contains a MonadRef type class that abstracts over the details of manipulating references, allowing one to write code that can operate in either the ST monad or the IO monad.

This package provides basic types for representing XML documents.

This library provides law-abiding lenses for Aeson, using microlens.

nhc98 is a small, standards-compliant compiler for Haskell 98, the lazy functional programming language. It aims to produce small executables that run in small amounts of memory. It produces medium-fast code, and compilation is itself quite fast.

The Glasgow Haskell Compiler (GHC) is a state-of-the-art compiler and interactive environment for the functional language Haskell.

The Glasgow Haskell Compiler (GHC) is a state-of-the-art compiler and interactive environment for the functional language Haskell.