This library provides data structures for describing changes to other data structures. In this library, a patch is something that can be applied, analogous to a function, and which distinguishes returning the argument it was provided from returning something else.

This package tries to compat as many time features as possible.

Pandoc is a Haskell library for converting from one markup format to another, and a command-line tool that uses this library. It can read and write Markdown and (subsets of) other formats, such as HTML, reStructuredText, LaTeX, DocBook, and many more.

Pandoc extends standard Markdown syntax with footnotes, embedded LaTeX, definition lists, tables, and other features. A compatibility mode is provided for those who need a drop-in replacement for Markdown.pl.

This library provides functions for control flow inside of monads with anaphoric variants on if and when and a C-like switch function.

This library provides functions available in later versions of base to a wider range of compilers, without requiring the use of CPP pragmas in your code.

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

The ghc-ini Haskell library lets programmers quickly and easily read and write configuration files in the simple INI format.

Concatenative gives Haskell Factor-style combinators and arrows for postfix notation. For more information on stack based languages, see https://concatenative.org.

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 provides the natural numbers for Haskell.

Utilities to parse, print, diff, and analyse data in CoNLL-U, a format used in linguistics to represent the syntactic annotation of sentences. See https://universaldependencies.org/format.html

This library provides Numeric.Interval.Interval, which represents a closed, convex set of floating point values.

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 package provides a Cairo vector graphics rendering backend for the Charts library.

This package provides a basic random number generation library, including the ability to split random number generators.

This package provides an interface to file locking functionalities.

Lifted-base exports IO operations from the base library lifted to any instance of MonadBase or MonadBaseControl. Note that not all modules from base are converted yet. The package includes a copy of the monad-peel test suite written by Anders Kaseorg.

This Haskell package provides compatibility layer for ghc-aeson.

This package provides a modular backend for rendering diagrams created with the diagrams embedded domain-specific language (EDSL) to Scalable Vector Graphics (SVG) files.

A data-type like Either but with differing properties and type-class instances.

Library support is provided for this different representation, including lens-related functions for converting between each and abstracting over their similarities.

The Validation data type is isomorphic to Either, but has an instance of Applicative that accumulates on the error side. That is to say, if two (or more) errors are encountered, they are appended using a Semigroup operation.

As a consequence of this Applicative instance, there is no corresponding Bind or Monad instance. Validation is an example of, "An applicative functor that is not a monad."

Long lived application data typically should not contain any thunks. This library can be used to examine values for unexpected thunks, which can then be used in assertions. This can be invaluable in avoiding memory leaks, or tracking down existing ones.

This library provides extra functions for the standard Haskell libraries. Most functions are simple additions, filling out missing functionality. A few functions are available in later versions of GHC, but this package makes them available back to GHC 7.2.

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

This Haskell package provides an abstract interface to highly-parameterizable queues/deques.

Background: There exists a feature space for queues that extends between:

• Simple, single-ended, non-concurrent, bounded queues

• Double-ended, thread-safe, growable queues with important points in between (such as the queues used for work stealing).

This package includes an interface for Deques that allows the programmer to use a single API for all of the above, while using the type system to select an efficient implementation given the requirements (using type families).

This package also includes a simple reference implementation based on IORef and Data.Sequence.