This library is intended to be a comprehensive solution to parsing and selecting quality-indexed values in HTTP headers. It is capable of parsing both media types and language parameters from the Accept and Content header families, and can be extended to match against other accept headers as well. Selecting the appropriate header value is achieved by comparing a list of server options against the quality-indexed values supplied by the client. . In the following example, the Accept header is parsed and then matched against a list of server options to serve the appropriate media using mapAcceptMedia': . > getHeader >>= maybe send406Error sendResourceWith . mapAcceptMedia > [ ("text/html", asHtml) > , ("application/json", asJson) > ] . Similarly, the Content-Type header can be used to produce a parser for request bodies based on the given content type with mapContentMedia': . > getContentType >>= maybe send415Error readRequestBodyWith . mapContentMedia > [ ("application/json", parseJson) > , ("text/plain", parseText) > ] . The API is agnostic to your choice of server.

This library provides an easy way to define command line parsers.

This package provides basic types for representing XML documents.

This library provides mechanisms to efficiently run periodic, on-demand actions in Haskell.

This library defines a propositional equality data type, shims Data.Type.Equality as well as possible for older GHC versions (< 7.8).

data a :~: b where
  Refl :: a :~: a

The module Data.Type.Equality.Hetero shims @code:~~: equality, and for compilers with PolyKinds.

This package provides a Readable type class for reading data types from ByteString and Text. It also includes efficient implementations for common data types.

This package defines orphan instances that mimic instances available in later versions of base to a wider (older) range of compilers.

This package provides Haskell modules to allow use of Accessor to access state in transformers State monad.

This Haskell library provides implementations of special mathematical functions and Chebyshev polynomials. These functions are often useful in statistical and numerical computing.

This package provides a quasiquoter for non-interpolated strings, texts and bytestrings.

This package provides Haskell bindings to bzlib and Conduit support for streaming compression and decompression.

This library provides exception safe semaphores that can be used in place of QSem, QSemN, and SampleVar, all of which are not exception safe and can be broken by killThread.

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

Haskell98 invariant functors (also known as exponential functors). For more information, see Edward Kmett's article Rotten Bananas.

This package defines an Active abstraction for time-varying values with finite start and end times. It is used for describing animations within the diagrams framework.

This Haskell library provides a purely functional interface for statistics based on hmatrix and GSL.

This library lets you write interactive programs without callbacks or side-effects. Functional Reactive Programming (FRP) uses composable events and time-varying values to describe interactive systems as pure functions. Just like other pure functional code, functional reactive code is easier to get right on the first try, maintain, and reuse. Reflex is a fully-deterministic, higher-order FRP interface and an engine that efficiently implements that interface.

This package provides Haskell library for matching files using patterns such as \"src\/**\/*.png\" for all @file.png files recursively under the @filesrc directory.

Some of its features include:

• All matching is O(n).

• Most functions pre-compute some information given only one argument.

• Uses match and substitute to extract suitable strings from the * and ** matches, and substitutes them back into other patterns.

• Uses step and matchMany to perform bulk matching of many patterns against many paths simultaneously.

• Uses System.FilePattern.Directory to perform optimised directory traverals using patterns.

Haskell library for opening the web browser.

Type classes for convenient marshalling and calling of Lua functions.

The YAML 1.2 format provides a much richer data-model and feature-set than the JavaScript Object Notation format. However, sometimes it's desirable to ignore the extra capabilities and treat YAML as if it was merely a more convenient markup format for humans to write JSON data. To this end this module provides a compatibility layer atop ghc-hsyaml ,which allows decoding YAML documents in the more limited JSON data-model while also providing convenience by reusing ghc-aeson's FromJSON instances for decoding the YAML data into native Haskell data types.

The solver component used in cabal-install command-line program.

This library provides file handling utilities for Haskell.

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.