Haskell-Pipes-Library

by Gabriel439

Compositional pipelines

425 Stars 71 Forks Last release: almost 6 years ago (pipes-4.1.2) Other 1.1K Commits 19 Releases

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pipes

pipes
is a clean and powerful stream processing library that lets you build and connect reusable streaming components.

Quick start

Then fire up

ghci
:
$ ghci
Prelude> import Pipes
Prelude Pipes> import qualified Pipes.Prelude as P

... and echo standard input to standard output until you enter

quit
.
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.

Features

  • Concise API: Use simple commands like

    for
    ,
    (>->)
    ,
    await
    , and
    yield
  • Blazing fast: Implementation tuned for speed, including shortcut fusion

  • Lightweight Dependency:

    pipes
    is small and compiles very rapidly, including dependencies
  • Elegant semantics: Use practical category theory

  • ListT: Correct implementation of

    ListT
    that interconverts with pipes
  • Bidirectionality: Implement duplex channels

  • Extensive Documentation: Second to none!

Philosophy

The

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

Outline

The core

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
    and
    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

Development Status

Build Status

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.

Community Resources

How to contribute

  • Contribute code

  • Build derived libraries

  • Write

    pipes
    tutorials

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.

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