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-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
-<pkgmetadata>
- <maintainer type="project">
- <email>haskell@gentoo.org</email>
- <name>Gentoo Haskell</name>
- </maintainer>
- <longdescription>
- /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.'System.IO.Streams.read' :: 'System.IO.Streams.InputStream' a -&gt; IO (Maybe a)
-
- \-\- push an item back to an input stream
- Streams.'System.IO.Streams.unRead' :: a -&gt; 'System.IO.Streams.InputStream' a -&gt; IO ()
-
- \-\- write to an output stream
- Streams.'System.IO.Streams.write' :: Maybe a -&gt; 'System.IO.Streams.OutputStream' a -&gt; IO ()
- @
-
- Streams can be transformed by composition and hooked together with provided combinators:
-
- @
- ghci&gt; Streams.fromList [1,2,3::Int] &gt;&gt;= Streams.map (*10) &gt;&gt;= Streams.toList
- [10,20,30]
- @
-
- Stream composition leaves the original stream accessible:
-
- @
- ghci&gt; input \&lt;- Streams.fromByteString \"long string\"
- ghci&gt; wrapped \&lt;- Streams.takeBytes 4 input
- ghci&gt; Streams.read wrapped
- Just \"long\"
- ghci&gt; Streams.read wrapped
- Nothing
- ghci&gt; 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:
-
- * functions to use files, handles, concurrent channels, sockets, lists,
- vectors, and more as streams.
-
- * a variety of combinators for wrapping and transforming streams, including
- compression and decompression using zlib, controlling precisely how many
- bytes are read from or written to a stream, buffering output using
- bytestring builders, folds, maps, filters, zips, etc.
-
- * support for parsing from streams using @attoparsec@.
-
- * support for spawning processes and communicating with them using streams.
-
- /ChangeLog/
-
- [@1.1.4.2@] Fixed a build error with network versions older than 2.4.
-
- [@1.1.4.1@] @System.IO.Streams.Network@: scalability improvement: buffers
- for socket reads are now allocated by system malloc rather than
- by pinned pointers in GHC (currently pinned pointer allocation
- takes a global lock).
-
- [@1.1.4.0@] Widened @attoparsec@ and @text@ library dependencies to allow
- the latest versions.
-
- [@1.1.3.0@] Added @System.IO.Streams.ByteString.takeExactly@. Widened
- @network@ dependency to include 2.3. Added a
- @NoInteractiveTests@ flag to selectively disable some tests for
- environments where spawning interactive processes is
- impossible.
-
- [@1.1.2.2@] Allowed newest versions of the @process@, @test-framework@,
- and @text@ libraries.
-
- [@1.1.2.1@] Fixed build error when compiled against attoparsec-0.10.0.x.
-
- [@1.1.2.0@] Added @System.IO.Streams.Concurrent.makeChanPipe@, to create a
- simple concurrent pipe between an @InputStream@/@OutputStream@
- pair.
-
- [@1.1.1.0@] Added @System.IO.Streams.Network.socketToStreamsWithBufferSize@,
- allowing control over the size of the receive buffers used when
- reading from sockets.
-
- [@1.1.0.3@] Fixed an inconsistent version upper bound in the test suite.
-
- [@1.1.0.2@] Fixed a typo in the tutorial.
-
- [@1.1.0.1@] A couple of Haddock markup fixes.
-
- [@1.1.0.0@] Reworked, simplified, and streamlined the internals of the
- library. Exports from "System.IO.Streams.Internal" relying on
- Sources and Sinks were deleted because they are no longer
- necessary: Source(..), Sink(..), defaultPushback,
- withDefaultPushback, nullSource, nullSink, singletonSource,
- simpleSource, sourceToStream, sinkToStream, generatorToSource,
- and consumerToSink.
-
- [@1.0.2.2@] Fixed a bug in which \"takeBytes 0\" was erroneously requesting
- input from the wrapped stream.
-
- [@1.0.2.1@] Fixed a compile error on GHC 7.0.x.
-
- [@1.0.2.0@] Added "System.IO.Streams.Process" (support for communicating
- with system processes using streams), added new functions to
- "System.IO.Streams.Handle" for converting @io-streams@ types to
- 'System.IO.Handle's. (Now you can pass streams from this
- library to places that expect Handles and everything will
- work.)
-
- [@1.0.1.0@] Added 'System.IO.Streams.Combinators.ignoreEof'.
-
- [@1.0.0.1@] Fixed some haddock markup.
- </longdescription>
-</pkgmetadata>