io-streams: Simple, composable, and easy-to-use stream I/O

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Overview

The io-streams library contains simple and easy-to-use primitives for I/O using streams. Most users will want to import the top-level convenience module System.IO.Streams, which re-exports most of the library:

import           System.IO.Streams (InputStream, OutputStream)
import qualified System.IO.Streams as Streams

For first-time users, io-streams comes with an included tutorial, which can be found in the System.IO.Streams.Tutorial module.

Features

The io-streams user API has two basic types: InputStream a and OutputStream a, and three fundamental I/O primitives:

-- read an item from an input stream
Streams.read :: InputStream a -> IO (Maybe a)

-- push an item back to an input stream
Streams.unRead :: a -> InputStream a -> IO ()

-- write to an output stream
Streams.write :: Maybe a -> OutputStream a -> IO ()

Streams can be transformed by composition and hooked together with provided combinators:

ghci> Streams.fromList [1,2,3::Int] >>= Streams.map (*10) >>= Streams.toList
[10,20,30]

Stream composition leaves the original stream accessible:

ghci> input <- Streams.fromByteString "long string"
ghci> wrapped <- Streams.takeBytes 4 input
ghci> Streams.read wrapped
Just "long"
ghci> Streams.read wrapped
Nothing
ghci> Streams.read input
Just " string"

Simple types and operations in the IO monad mean straightforward and simple exception handling and resource cleanup using Haskell standard library facilities like Control.Exception.bracket.

io-streams comes with:


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Properties

Versions 1.0.0.0, 1.0.0.1, 1.0.1.0, 1.0.2.0, 1.0.2.1, 1.0.2.2, 1.1.0.0, 1.1.0.1, 1.1.0.2, 1.1.0.3, 1.1.1.0, 1.1.2.0, 1.1.2.1, 1.1.2.2, 1.1.3.0, 1.1.4.0, 1.1.4.1, 1.1.4.2, 1.1.4.3, 1.1.4.4, 1.1.4.5, 1.1.4.6, 1.2.0.0, 1.2.0.1, 1.2.1.1, 1.2.1.2, 1.2.1.3, 1.3.0.0, 1.3.1.0, 1.3.2.0, 1.3.3.0, 1.3.3.1, 1.3.4.0, 1.3.5.0, 1.3.6.0, 1.3.6.1, 1.4.0.0, 1.4.1.0, 1.5.0.0, 1.5.0.1, 1.5.1.0, 1.5.2.0, 1.5.2.0, 1.5.2.1
Change log changelog.md
Dependencies attoparsec (>=0.10 && <0.14), base (>=4 && <5), bytestring (>=0.9 && <0.11), bytestring-builder (>=0.10 && <0.11), network (>=2.3 && <3.2), primitive (>=0.2 && <0.8), process (>=1.1 && <1.7), text (>=0.10 && <1.3), time (>=1.2 && <1.10), transformers (>=0.2 && <0.6), vector (>=0.7 && <0.13), zlib-bindings (>=0.1 && <0.2) [details]
License BSD-3-Clause
Author
Maintainer Gregory Collins <greg@gregorycollins.net>
Category Data, Network, IO-Streams
Bug tracker https://github.com/snapframework/io-streams/issues
Source repo head: git clone https://github.com/snapframework/io-streams.git
Uploaded by GregoryCollins at 2020-09-07T12:55:49Z

Modules

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Flags

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NameDescriptionDefault
zlib

Include zlib support

Enabled
network

Include network support

Enabled
Automatic Flags
NameDescriptionDefault
nointeractivetests

Do not run interactive tests

Disabled

Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info

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For package maintainers and hackage trustees


Readme for io-streams-1.5.2.0

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The io-streams library contains simple and easy to use primitives for I/O using streams. Based on simple types with one type parameter (InputStream a and OutputStream a), io-streams provides a basic interface to side-effecting input and output in IO monad with the following features: