Difference between revisions of "Applications and libraries"

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__NOTOC__
 
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[[Category:Libraries]] [[Category:Tools]]
   
The first place to look for data types or functions that do what you want is the Standard Prelude, then the [[Language and library specification]] (both parts of the Haskell standards documentation), then in whatever extra libraries are provided by the Haskell implementation you are using, then on the page you are looking at. If it is not here, then it may be in the [http://www.cse.unsw.edu.au/~dons/announce.html archives] of the [[Haskell Weekly News]].
 
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The number of Haskell packages is growing rapidly. The section 'Haskell library collections' gives an ordering of all these packages by relative importance. In the section 'Haskell applications and libraries' an ordering by category is given. Finally some guidelines for developers of new packages are presented.
   
Search the standard libraries collection (by name or type signature)
 
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== Haskell library collections ==
using [http://haskell.org/hoogle Hoogle]. A large collection of [http://www.haskell.org/ghc/docs/latest/html/libraries/index.html standard hierarchical libraries] are currently distributed with GHC (from version 5.04), Hugs (from Nov 2003), and nhc98 (from 1.16).
 
   
[[Cabal]], The Common Architecture for Building Applications and Libraries, is an framework for packaging, building, and installing any tool developed in the Haskell language. See also the
 
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=== Haskell Prelude ===
[http://hackage.haskell.org/ModHackage/Hackage.hs?action=home Hackage database]. There is a [http://www.haskell.org/mailman/listinfo/libraries mailing list] for discussing issues related to libraries.
 
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The most important Haskell library is called the [https://hackage.haskell.org/package/base-4.12.0.0/docs/Prelude.html Prelude]. It is implicitly imported by default, and includes the most commonly used functions. Make sure you know what they do and how to use them effectively.
   
Some of the libraries and tools linked to from the library and tools pages are proof-of-concepts rather than production code. Some have no longer been maintained for a long time.
 
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=== Haskell 2010 libraries ===
On freshmeat.net there is [http://freshmeat.net/browse/834/?topic_id=834 an alternative list of software written in Haskell]. That list is currently short (for you to change that). Even more Haskell projects are documented in the [http://haskell.org/communities/ community reports] and in the archives of the [[Haskell Weekly News]]. Google knows about some rare things not documented anywhere else.
 
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The Haskell 2010 [[Language and library specification]] defines a set of [http://www.haskell.org/onlinereport/haskell2010/haskellpa2.html libraries] with basic functionality which all Haskell implementations should support, including the Prelude. Changes to these libraries are handled by the [http://web.archive.org/web/20191229055836/https://prime.haskell.org/ Haskell'] process.
   
== Categories of Libraries and Tools ==
 
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Haskell modules that almost everybody uses are in this group, for example:
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[http://www.haskell.org/onlinereport/haskell2010/haskellch13.html Control.Monad], [http://www.haskell.org/onlinereport/haskell2010/haskellch20.html Data.List]
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and [http://www.haskell.org/onlinereport/haskell2010/haskellch41.html System.IO]. Within GHC, these are mostly grouped into the [http://hackage.haskell.org/package/base base] package, but for example [http://www.haskell.org/onlinereport/haskell2010/haskellch14.html Data.Array] is in the [http://hackage.haskell.org/package/array array] package.
   
* [[/Program development/]]
 
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=== GHC bootstrap libraries ===
* [[/Data structures/]]
 
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GHC comes with an expanded version of the Haskell 2010 libraries. Together these are called the [http://www.haskell.org/ghc/docs/latest/html/libraries/index.html GHC bootstrap libraries]. You should not rely on this list being stable, since it is just the list of packages that are needed to build GHC itself (including ghci and the user guide).
* [[/Extended Haskell/]]
 
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* [[/Interfacing other languages|Tools for interfacing with other languages]]
 
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Examples of libraries that are GHC 7.8.3 boot libraries (but not core libraries, see below):
* [[/Operating system/|Operating systems and systems programming]]
 
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[http://hackage.haskell.org/package/haskeline haskeline],
* [[/Network/]]
 
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[http://hackage.haskell.org/package/integer-gmp integer-gmp] and
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[http://hackage.haskell.org/package/terminfo terminfo].
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=== Core Libraries ===
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The core libraries form a subset of the packages in the Haskell Platform that has submitted to the management process described on the [[Library submissions]] page.
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These packages typically define basic APIs that are expected to be available in any Haskell implementation, packages that are being maintained for backwards compatibility, or in some cases, which are just needed as glue to hold the rest of the platform together.
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Not all GHC boot libraries are core libraries.
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Examples of libraries, or packages, that belong to this group are:
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[http://hackage.haskell.org/package/mtl Monad transformer library],
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[http://hackage.haskell.org/package/random random] and
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[http://hackage.haskell.org/package/parallel parallel].
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=== Haskell Platform libraries ===
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On top of the Core Libraries, the [http://www.haskell.org/platform/ Haskell Platform] comes preinstalled with some additional packages that together form the [http://www.haskell.org/platform/contents.html#packages-and-documentation Haskell Platform libraries]. These libraries have been thoroughly tested before being included. The addition of these libraries with the [http://www.haskell.org/platform/ Haskell Platform] is what makes it 'batteries included'.
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Examples of included packages are:
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[http://hackage.haskell.org/package/attoparsec attoparsec], [http://hackage.haskell.org/package/network network] and [http://hackage.haskell.org/package/QuickCheck QuickCheck].
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=== The Hackage database ===
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[http://hackage.haskell.org/packages/archive/pkg-list.html Hackage] is the final layer of the Haskell library collections. [http://hackage.haskell.org/packages/archive/pkg-list.html Hackage] aims to provide a comprehensive collection of released Haskell packages, similar to Perl's CPAN or Python's PyPI.
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Start on [http://hackage.haskell.org/packages/archive/pkg-list.html Hackage] if you are looking for some functionality that did not come preinstalled with the [http://www.haskell.org/platform/ Haskell Platform].
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See also the [[Hackage|Hackage wiki page]] and [[Cabal/How to install a Cabal package | how to install a Cabal package]].
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== Haskell applications and libraries ==
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Applications, libraries and tools for Haskell or written in Haskell have been classified below, but you should check [http://hackage.haskell.org/packages/archive/pkg-list.html Hackage] for the latest list.
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* [[/Music and sound/|Audio, music and sound]]
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* [[/Bioinformatics/]]
 
* [[/Concurrency and parallelism/]]
 
* [[/Concurrency and parallelism/]]
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* [[/Compilers and interpreters/]]
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* [[/Compiler tools|Compiler construction, lexing, parsing, pretty printing]]
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* [[/Cryptography|Cryptography and hashing]]
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* [[/Data structures | Data Structures and IO Libraries]]
 
* [[/Database interfaces/]]
 
* [[/Database interfaces/]]
* [[/GUI libraries|Graphical User Interface Libraries]]
 
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* [[/Editors|Editors written in Haskell]] and [[Editors|editors for Haskell]].
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* [[/Extended Haskell/]]
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* [[/Games/]]
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* [[/Generic programming/]]
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* [[/GUI libraries|Graphical User Interface (GUI) Libraries]]
 
* [[/Graphics/]]
 
* [[/Graphics/]]
* [[/Web programming|Web, HTML, XML]]
 
* [[/Compiler tools|Parsing, lexing and regular expressions]]
 
* [[/Pretty printing|Pretty-printer libraries]]
 
* [[/Editors/]]
 
* [[/Mathematics|Mathematics]]
 
* [[/Theorem provers/]]
 
 
* [[/Hardware verification/]]
 
* [[/Hardware verification/]]
* [[/Robots/]]
 
* [[/Music and sound/|Audio, music and sound]]
 
* [[/Genetic programming/]]
 
 
* [[/Linguistics|Linguistics and natural language processing]]
 
* [[/Linguistics|Linguistics and natural language processing]]
* [[/Cryptography|Cryptography and hashing]]
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* [[/Mathematics/|Mathematics and physics]]
* [[/Games/]]
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* [[/Network/]]
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* [[/Operating system/|Operating systems and systems programming]] (also emulators)
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* [[/Program development/]]
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* [[/Robotics/]]
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* [[/Statistics/]]
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* [[/Theorem provers/]]
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* [[/Interfacing other languages|Tools for interfacing with other languages]]
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* [[Web|Web, HTML, XML]]
   
== Recommended libraries ==
 
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Other places to look include:
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* The [[Library]] hierarchy page on this wiki.
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* The Haskell [[Haskell Communities and Activities Report|community reports]].
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* The [http://www.haskell.org/mailman/listinfo/libraries mailing list] for discussion of issues related to libraries.
   
[[Recommendations|Advice]] on the best libraries to use for particular problem cases.
 
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You can also [http://www.reddit.com/r/haskell_proposals/top/?t=month propose and vote on new libraries] that you'd like on [http://www.reddit.com/r/haskell reddit], and look at our past [http://web.archive.org/web/20170721102552/ghc.haskell.org/trac/summer-of-code/ Summer of Code proposals].
   
== Activity ==
 
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== Guidelines for developers ==
   
Project activity for some of the larger Haskell projects is graphed [http://www.cse.unsw.edu.au/~dons/images/commits/community/ here].
 
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[[Image:Cabal-With-Text-small.png|frame|Built with Cabal]]
   
== Libraries for other languages ==
 
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Developer guides:
   
If you are thinking about designing a new library for Haskell, you ought to look what has been done in other languages. Here are standard library definitions for
 
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* [[How to write a Haskell program|How to write a new Haskell library]]
 
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* [[Library submissions|How to propose changes to the standard libraries]]
* [http://www.cs.ru.nl/~clean/Download/Download_Libraries/body_download_libraries.html Clean]
 
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* [http://web.archive.org/web/20071011215053/http://pupeno.com/2006/12/12/the-lambda-revolution-v/ Creating a .deb from a Haskell Cabal package] (in the Web Archive)
* [http://cm.bell-labs.com/cm/cs/what/smlnj/doc/basis/index.html Standard ML]
 
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* Guide to making standard [[Library submissions|library submissions]]
* [http://caml.inria.fr/pub/docs/manual-ocaml/manual034.html Objective Caml]
 
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* If you notice the library documentation is lacking, or could be improved, [http://www.haskell.org/haskellwiki/Improving_library_documentation please report it here]
* [http://srfi.schemers.org/ Scheme]
 
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* [[Future projects]], more projects people would like.
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* [[Cabal]], The Common Architecture for Building Applications and Libraries, is a framework for packaging, building, and installing any tool developed in the Haskell language.
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* [[Hack-Nix]], a set of tools based on the [http://nixos.org Nix] package manager to manage multiple setups to build a project
   
 
Proposals for the module name space layout that can be used to guide the construction of new libraries.
 
Proposals for the module name space layout that can be used to guide the construction of new libraries.
   
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* [[Hierarchical module names|Almost current guide]]
 
* [http://www.cs.york.ac.uk/fp/libraries/layout.html Proposal 1]
 
* [http://www.cs.york.ac.uk/fp/libraries/layout.html Proposal 1]
 
* [http://www.cs.york.ac.uk/fp/libraries/layoutSM.html Proposal 2]
 
* [http://www.cs.york.ac.uk/fp/libraries/layoutSM.html Proposal 2]
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=== Libraries for other languages ===
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If you are thinking about designing a new library for Haskell, you ought to look what has been done in other languages. Here are standard library definitions for
  +
  +
* [http://wiki.clean.cs.ru.nl/Libraries Clean]
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* [http://www.standardml.org/Basis/ Standard ML]
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* [http://web.archive.org/web/20070515163201/caml.inria.fr/pub/docs/manual-ocaml/manual034.html Objective Caml]
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* [http://srfi.schemers.org/ Scheme]

Latest revision as of 01:40, 1 March 2020


The number of Haskell packages is growing rapidly. The section 'Haskell library collections' gives an ordering of all these packages by relative importance. In the section 'Haskell applications and libraries' an ordering by category is given. Finally some guidelines for developers of new packages are presented.

Haskell library collections

Haskell Prelude

The most important Haskell library is called the Prelude. It is implicitly imported by default, and includes the most commonly used functions. Make sure you know what they do and how to use them effectively.

Haskell 2010 libraries

The Haskell 2010 Language and library specification defines a set of libraries with basic functionality which all Haskell implementations should support, including the Prelude. Changes to these libraries are handled by the Haskell' process.

Haskell modules that almost everybody uses are in this group, for example: Control.Monad, Data.List and System.IO. Within GHC, these are mostly grouped into the base package, but for example Data.Array is in the array package.

GHC bootstrap libraries

GHC comes with an expanded version of the Haskell 2010 libraries. Together these are called the GHC bootstrap libraries. You should not rely on this list being stable, since it is just the list of packages that are needed to build GHC itself (including ghci and the user guide).

Examples of libraries that are GHC 7.8.3 boot libraries (but not core libraries, see below): haskeline, integer-gmp and terminfo.

Core Libraries

The core libraries form a subset of the packages in the Haskell Platform that has submitted to the management process described on the Library submissions page.

These packages typically define basic APIs that are expected to be available in any Haskell implementation, packages that are being maintained for backwards compatibility, or in some cases, which are just needed as glue to hold the rest of the platform together.

Not all GHC boot libraries are core libraries.

Examples of libraries, or packages, that belong to this group are: Monad transformer library, random and parallel.

Haskell Platform libraries

On top of the Core Libraries, the Haskell Platform comes preinstalled with some additional packages that together form the Haskell Platform libraries. These libraries have been thoroughly tested before being included. The addition of these libraries with the Haskell Platform is what makes it 'batteries included'.

Examples of included packages are: attoparsec, network and QuickCheck.

The Hackage database

Hackage is the final layer of the Haskell library collections. Hackage aims to provide a comprehensive collection of released Haskell packages, similar to Perl's CPAN or Python's PyPI.

Start on Hackage if you are looking for some functionality that did not come preinstalled with the Haskell Platform.

See also the Hackage wiki page and how to install a Cabal package.

Haskell applications and libraries

Applications, libraries and tools for Haskell or written in Haskell have been classified below, but you should check Hackage for the latest list.

Other places to look include:

You can also propose and vote on new libraries that you'd like on reddit, and look at our past Summer of Code proposals.

Guidelines for developers

Built with Cabal

Developer guides:

Proposals for the module name space layout that can be used to guide the construction of new libraries.

Libraries for other languages

If you are thinking about designing a new library for Haskell, you ought to look what has been done in other languages. Here are standard library definitions for