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pipes is a clean and powerful stream processing library that lets you build
and connect reusable streaming components.
- Install the Haskell Platform
cabal install pipes
Then fire up
$ ghci Prelude> import Pipes Prelude Pipes> import qualified Pipes.Prelude as P
... and echo standard input to standard output until you enter
Prelude Pipes P> runEffect $ P.stdinLn >-> P.takeWhile (/= "quit") >-> P.stdoutLn Test[Enter] Test Apple[Enter] Apple quit[Enter] Prelude P> -- Done!
To learn more, read the pipes tutorial.
Concise API: Use simple commands like
Blazing fast: Implementation tuned for speed, including shortcut fusion
pipesis small and compiles very rapidly, including dependencies
Elegant semantics: Use practical category theory
ListT: Correct implementation of
ListTthat interconverts with pipes
Bidirectionality: Implement duplex channels
Extensive Documentation: Second to none!
pipes library emphasizes the following three design precepts:
Emphasize elegance - Elegant libraries replace inelegant libraries
Theory everywhere - Principled design promotes intuitive behavior
Minimize dependencies - Small dependency profiles maximize portability
pipes ecosystem consists of the following four libraries:
pipes: The elegant, theoretically-principled core.
pipes-concurrency: Message passing and reactive programming
pipes-parse: Utilities for parsing streams
pipes-safe: Resource management and exception safety
These represent the core areas that I envision for
pipes. The latter three
libraries represent the more pragmatic face of the ecosystem and make design
tradeoffs where there is no known elegant solution.
Derived libraries that build on top of these include:
pipes-network-tls: Networking support
pipes-attoparsec: High-efficiency streaming parsing
pipes-zlib: Compression and decompression
pipes-binary: Streaming serialization and deserialization
pipes-aeson: Streaming JSON encoding and decoding
pipes is stable, and current work focuses on packaging
pipes for various
package managers. The long term goal is to get
pipes into the Haskell
platform and become the basic building block for streaming APIs.
How to contribute
Build derived libraries
License (BSD 3-clause)
Copyright (c) 2012-2014 Gabriel Gonzalez All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of Gabriel Gonzalez nor the names of other contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*Note that all licence references and agreements mentioned in the pipes README section above are relevant to that project's source code only.