Difference between revisions of "Applications and libraries"

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[[Category:Libraries]] [[Category:Tools]]
   
__NOTOC__
 
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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.
   
The first place to look for data types or functions that do what you
 
  +
== Haskell library collections ==
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]].
 
   
Search the standard libraries collection (by name or type signature)
 
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=== Haskell Prelude ===
using [http://haskell.org/hoogle Hoogle].
 
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The most important Haskell library is called the [http://www.haskell.org/ghc/docs/latest/html/libraries/base/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.
   
There is a [http://www.haskell.org/mailman/listinfo/libraries mailing list] for discussing issues related to libraries.
 
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=== Haskell 2010 libraries ===
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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://prime.haskell.org/ Haskell'] process.
   
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).
 
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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.
   
[[Cabal]], The Common Architecture for Building Applications and Libraries, is an framework for packaging, building, and installing any tool developed in the Haskell language.
 
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=== GHC bootstrap libraries ===
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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).
   
This page was intended as a comprehensive list of all Haskell libraries and tools. Because of Haskell's success, the list grew too large to be on one page, and it has now been split up. 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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Examples of libraries that are GHC 7.8.3 boot libraries (but not core libraries, see below):
  +
[http://hackage.haskell.org/package/haskeline haskeline],
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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].
   
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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=== 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.
   
== Categories of Libraries and Tools ==
 
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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.
   
* [[/Program development/]]
 
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Not all GHC boot libraries are core libraries.
* [[/Data structures/]]
 
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* [[/Extended Haskell/]]
 
  +
Examples of libraries, or packages, that belong to this group are:
* [[/Interfacing other languages|Tools for interfacing with other languages]]
 
  +
[http://hackage.haskell.org/package/mtl Monad transformer library],
* [[/Operating system/]]
 
  +
[http://hackage.haskell.org/package/random random] and
* [[/Network/]]
 
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[http://hackage.haskell.org/package/parallel parallel].
* [[/RPC|Web services and Remote Procedure Call libraries]]
 
  +
  +
=== Haskell Platform libraries ===
  +
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'.
  +
  +
Examples of included packages are:
  +
[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 ===
  +
[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.
  +
  +
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]]
 
* [[/Pretty printing|Pretty-printer libraries]]
 
* [[/Compiler tools|Compiler, parsing, lexing and regular expressions]]
 
* [[/Editors/]]
 
* [[/Mathematics|Numerical algorithms and mathematics]]
 
* [[/Theorem provers/]]
 
 
* [[/Hardware verification/]]
 
* [[/Hardware verification/]]
* [[/Robots/]]
 
* [[/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]]
   
== Various 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.
   
If you figure you a good category for any of these libraries, please move it to the appropriate page, or make a new page and link to it above.
 
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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://hackage.haskell.org/trac/summer-of-code/ Summer of Code proposals].
   
;[http://www.haskell.org/~petersen/haskell/popenhs/ popenhs]
 
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== Guidelines for developers ==
:A small library, based on runProcess in the standardised posix library. It provides lazy output from subprocesses.
 
   
;[http://fldit-www.cs.uni-dortmund.de/~peter/#1 Expander2]
 
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[[Image:Cabal-With-Text-small.png|frame|Built with Cabal]]
:Expander2 is a flexible multi-purpose workbench for rewriting, verification, constraint solving, flow graph analysis and related procedures that build up proofs or computation sequences. Moreover, tailor-made interpreters display terms as 2D structures ranging from trees and rooted graphs to tables, fractals and other turtle-system-generated pictures.
 
   
;[http://www2-data.informatik.unibw-muenchen.de/EdComb/ EdComb]
 
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Developer guides:
:Editor combinators allow to assemble structure editors compositionally instead of generating them from descriptions, just as parsing combinators allow to assemble parsers compositionally instead of employing parser generators to generate parsers from grammar descriptions.
 
   
;[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/smartest.html Smarty]<em>(via Internet Archive since 10/06/2003)</em>
 
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* [[How to write a Haskell program|How to write a new Haskell library]]
:The world's smartest i/o device for Haskell. An interface between Haskell and Squeak, a freely available Smalltalk language and environment.
 
  +
* [[Library submissions|How to propose changes to the standard libraries]]
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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)
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* Guide to making standard [[Library submissions|library submissions]]
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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]
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* [http://www.google.com/codesearch Google Code Search] can help identify common idioms, improving your API.
  +
* [[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
   
;[http://web.archive.org/web/*/http://www.numeric-quest.com/funpdf/ fun-&gt;pdf]<em>(via Internet Archive since 10/06/2003)</em>
 
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Proposals for the module name space layout that can be used to guide the construction of new libraries.
:An implementation of a PDF dynamic writer in Haskell.
 
   
== Collections of libraries ==
 
  +
* [[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/layoutSM.html Proposal 2]
   
* [http://repetae.net/john/computer/haskell/ John Meacham's Haskell tools and libraries]
 
  +
=== Libraries for other languages ===
* [http://www.cit.gu.edu.au/~arock/haskell/index.html Andrew Rock's library of useful modules]
 
* [http://www.informatik.uni-bonn.de/~ralf/software.html Libraries by Ralf Hinze] for data structures, sorting, searching, parsing, pretty printing, numerical algorithms, monads, etc.
 
* [http://web.comlab.ox.ac.uk/oucl/work/ian.lynagh/ Ian Lynagh's Haskell libraries]
 
* [http://www.reid-consulting-uk.ltd.uk/projects/index.html Reid Consulting's Libraries and Programs] CMI, TSL, Knit, Greencard, HGL, HSX11, HSWin32
 
* [http://www.cs.york.ac.uk/fp/software.html Software available from the York FP group] {{dead link}}
 
* [http://www.pms.informatik.uni-muenchen.de/mitarbeiter/panne/haskell_libs/ Sven's Haskell Libaries] {{dead link}} for interfacing to DaVinci, HTML/Cgi, OpenGL; a module for option handling, a Haskell parser, a binary library.
 
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/index.html Collection of Haskell modules] ''(since 10/06/2003: via Internet Archive)'' by Jan Skibinski, Numeric Quest Inc.
 
* [http://www.informatik.uni-bonn.de/~ralf/ Ralf Hinze] maintains a huge [http://www.informatik.uni-bonn.de/~ralf/software.html Haskell software page]
 
   
== 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
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]
  +
* [http://www.standardml.org/Basis/ Standard ML]
  +
* [http://caml.inria.fr/pub/docs/manual-ocaml/manual034.html Objective Caml]
 
* [http://srfi.schemers.org/ Scheme]
 
* [http://srfi.schemers.org/ Scheme]
* [http://cm.bell-labs.com/cm/cs/what/smlnj/doc/basis/index.html ML]
 

Latest revision as of 19:47, 4 April 2019


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