Difference between revisions of "Applications and libraries"

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Revision as of 22:29, 11 October 2010

The number of Haskell packages is growing exponentially. 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 import 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.

The 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.

In GHC most of these are in the 'base' package. Some of the most used Haskell modules are in this package, for example: Control.Monad, Data.List and System.IO.

The GHC standard libraries

GHC comes with an expanded version of the Haskell 2010 libraries. Together these are called the GHC standard libraries. Changes to these libraries are handled by the package maintainer if one exists, or the Library submissions process if not. Hoogle - the Haskell API Search Engine - indexes the GHC standard libraries.

Examples of libraries, or packages, that belong to this group are: bytestring, containers and Win32.

Haskell Platform libraries

On top of the GHC standard libraries, the Haskell Platform comes preinstalled with some additional packages that together form the Haskell Platform libraries. The extra libraries have been thoroughly tested and found industry worthy to be included as extra batteries.

Examples are: Monad transformer library, parallel and QuickCheck.

Hackage

The Hackage database aims to be 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 installed with any of the above mentioned libraries when you installed the Haskell Platform.

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:

The Library hierarchy page on this wiki.
The Haskell community reports.
The mailing list for discussion of issues related to libraries.

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:

How to write a new Haskell library
How to propose changes to the standard libraries
Creating a .deb from a Haskell Cabal package
Creating a Haskell library by example
Guide to making standard library submissions
If you notice the library documentation is lacking, or could be improved, please report it here
Google Code Search can help identify common idioms, improving your API.
Future projects, more projects people would like.
Project activity for some of the larger Haskell projects is graphed here.
Cabal, The Common Architecture for Building Applications and Libraries, is a framework for packaging, building, and installing any tool developed in the Haskell language.
Hack-Nix, a set of tools based on the 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.

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

Retrieved from "https://wiki.haskell.org/index.php?title=Applications_and_libraries&oldid=37244"

Categories:

@@ Line 1: / Line 1: @@
 [[Category:Libraries]] [[Category:Tools]]
+The number of Haskell packages is growing exponentially. 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 ==
-These are Haskell library collections in increasing order of size.
 === Haskell Prelude ===
@@ Line 10: / Line 9: @@
 === The Haskell 2010 Libraries ===
-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. Changes to these libraries are handled by the [http://hackage.haskell.org/trac/haskell-prime/ Haskell'] process.
+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://hackage.haskell.org/trac/haskell-prime/ Haskell'] process.
-Some of the most used Haskell modules are in this bunch, for example:
+In GHC most of these are in the 'base' package. Some of the most used Haskell modules are in this package, for example:
 [http://www.haskell.org/onlinereport/haskell2010/haskellch13.html Control.Monad], [http://www.haskell.org/onlinereport/haskell2010/haskellch20.html Data.List]
 and [http://www.haskell.org/onlinereport/haskell2010/haskellch41.html System.IO].
-In GHC most of these are in the 'base' package.
 === The GHC standard libraries ===
-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 standard libraries].
+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 standard libraries]. Changes to these libraries are handled by the package maintainer if one exists, or the [[Library submissions]] process if not. [http://haskell.org/hoogle Hoogle] - the Haskell API Search Engine - indexes the [http://www.haskell.org/ghc/docs/latest/html/libraries/index.html GHC standard libraries].
 Examples of libraries, or packages, that belong to this group are:
 [http://hackage.haskell.org/package/bytestring bytestring],
 [http://hackage.haskell.org/package/containers containers] and [http://hackage.haskell.org/package/Win32 Win32].
-Changes to these libraries are handled by the package maintainer if one exists, or the [[Library submissions]] process if not.
-[http://haskell.org/hoogle Hoogle] - the Haskell API Search Engine - indexes the above libraries
 === Haskell Platform libraries ===
@@ Line 35: / Line 28: @@
 === Hackage ===
-The [http://hackage.haskell.org/packages/archive/pkg-list.html Hackage] database aims to be a comprehensive a collection of released Haskell packages, similar to Perl's CPAN or Python's PyPI.
+The [http://hackage.haskell.org/packages/archive/pkg-list.html Hackage] database aims to be 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 installed with any of the above mentioned libraries when you installed the [http://hackage.haskell.org/platform/ Haskell Platform].