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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="src/System-IO-Utils.html">Source</a></li><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">MissingH-1.1.0.3: Large utility library</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Portability</th><td>portable</td></tr><tr><th>Stability</th><td>provisional</td></tr><tr><th>Maintainer</th><td>John Goerzen <jgoerzen@complete.org></td></tr><tr><th>Safe Haskell</th><td>None</td></tr></table><p class="caption">System.IO.Utils</p></div><div id="table-of-contents"><p class="caption">Contents</p><ul><li><a href="#g:1">Entire File Handle Utilities
</a><ul><li><a href="#g:2">Opened Handle Data Copying
</a></li><li><a href="#g:3">Disk File Data Copying
</a></li></ul></li><li><a href="#g:4">Line Processing Utilities
</a></li><li><a href="#g:5">Lazy Interaction
</a><ul><li><a href="#g:6">Character-based
</a></li><li><a href="#g:7">Line-based
</a></li><li><a href="#g:8">Misc. Lazy
</a></li></ul></li><li><a href="#g:9">Optimizations
</a></li></ul></div><div id="description"><p class="caption">Description</p><div class="doc empty"> </div></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><a href="#v:hCopy">hCopy</a> :: (<a href="System-IO-HVIO.html#t:HVIO">HVIO</a> a, <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> b) => a -> b -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a></li><li class="src short"><a href="#v:hCopyProgress">hCopyProgress</a> :: (<a href="System-IO-HVIO.html#t:HVIO">HVIO</a> b, <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> c, <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Prelude.html#t:Integral">Integral</a> a) => b -> c -> (<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-Maybe.html#t:Maybe">Maybe</a> a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Prelude.html#t:Integer">Integer</a> -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-Bool.html#t:Bool">Bool</a> -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a>) -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-Int.html#t:Int">Int</a> -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-Maybe.html#t:Maybe">Maybe</a> a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Prelude.html#t:Integer">Integer</a></li><li class="src short"><a href="#v:hLineCopy">hLineCopy</a> :: (<a href="System-IO-HVIO.html#t:HVIO">HVIO</a> a, <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> b) => a -> b -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a></li><li class="src short"><a href="#v:lineCopy">lineCopy</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a></li><li class="src short"><a href="#v:copyFileLinesToFile">copyFileLinesToFile</a> :: <a href="System-IO-HVFS.html#t:FilePath">FilePath</a> -> <a href="System-IO-HVFS.html#t:FilePath">FilePath</a> -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a></li><li class="src short"><a href="#v:hPutStrLns">hPutStrLns</a> :: <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> a => a -> [<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>] -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a></li><li class="src short"><a href="#v:hGetLines">hGetLines</a> :: <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> a => a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> [<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>]</li><li class="src short"><a href="#v:hInteract">hInteract</a> :: (<a href="System-IO-HVIO.html#t:HVIO">HVIO</a> a, <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> b) => a -> b -> (<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a> -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>) -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a></li><li class="src short"><a href="#v:hLineInteract">hLineInteract</a> :: (<a href="System-IO-HVIO.html#t:HVIO">HVIO</a> a, <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> b) => a -> b -> ([<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>] -> [<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>]) -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a></li><li class="src short"><a href="#v:lineInteract">lineInteract</a> :: ([<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>] -> [<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>]) -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a></li><li class="src short"><a href="#v:lazyMapM">lazyMapM</a> :: (a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> b) -> [a] -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> [b]</li><li class="src short"><a href="#v:optimizeForBatch">optimizeForBatch</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a></li><li class="src short"><a href="#v:optimizeForInteraction">optimizeForInteraction</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a></li></ul></div><div id="interface"><h1 id="g:1">Entire File Handle Utilities
</h1><h2 id="g:2">Opened Handle Data Copying
</h2><div class="top"><p class="src"><a name="v:hCopy" class="def">hCopy</a> :: (<a href="System-IO-HVIO.html#t:HVIO">HVIO</a> a, <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> b) => a -> b -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a><a href="src/System-IO-Utils.html#hCopy" class="link">Source</a></p><div class="doc"><p>Copies from one handle to another in raw mode (using
hGetContents).
</p></div></div><div class="top"><p class="src"><a name="v:hCopyProgress" class="def">hCopyProgress</a><a href="src/System-IO-Utils.html#hCopyProgress" class="link">Source</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: (<a href="System-IO-HVIO.html#t:HVIO">HVIO</a> b, <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> c, <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Prelude.html#t:Integral">Integral</a> a)</td><td class="doc empty"> </td></tr><tr><td class="src">=> b</td><td class="doc"><p>Input handle
</p></td></tr><tr><td class="src">-> c</td><td class="doc"><p>Output handle
</p></td></tr><tr><td class="src">-> (<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-Maybe.html#t:Maybe">Maybe</a> a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Prelude.html#t:Integer">Integer</a> -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-Bool.html#t:Bool">Bool</a> -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a>)</td><td class="doc"><p>Progress function -- the bool is always False unless this is the final call
</p></td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-Int.html#t:Int">Int</a></td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-Maybe.html#t:Maybe">Maybe</a> a</td><td class="doc empty"> </td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Prelude.html#t:Integer">Integer</a></td><td class="doc empty"> </td></tr></table></div><div class="doc"><p>Copies from one handle to another in raw mode (using hGetContents).
Takes a function to provide progress updates to the user.
</p></div></div><div class="top"><p class="src"><a name="v:hLineCopy" class="def">hLineCopy</a> :: (<a href="System-IO-HVIO.html#t:HVIO">HVIO</a> a, <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> b) => a -> b -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a><a href="src/System-IO-Utils.html#hLineCopy" class="link">Source</a></p><div class="doc"><p>Copies from one handle to another in text mode (with lines).
Like <code>hBlockCopy</code>, this implementation is nice:
</p><pre> hLineCopy hin hout = hLineInteract hin hout id
</pre></div></div><div class="top"><p class="src"><a name="v:lineCopy" class="def">lineCopy</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a><a href="src/System-IO-Utils.html#lineCopy" class="link">Source</a></p><div class="doc"><p>Copies from <code><a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/GHC-IO-Handle-FD.html#v:stdin">stdin</a></code> to <code><a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/GHC-IO-Handle-FD.html#v:stdout">stdout</a></code> using lines. An alias for <code><a href="System-IO-Utils.html#v:hLineCopy">hLineCopy</a></code>
over <code><a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/GHC-IO-Handle-FD.html#v:stdin">stdin</a></code> and <code><a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/GHC-IO-Handle-FD.html#v:stdout">stdout</a></code>.
</p></div></div><h2 id="g:3">Disk File Data Copying
</h2><div class="top"><p class="src"><a name="v:copyFileLinesToFile" class="def">copyFileLinesToFile</a> :: <a href="System-IO-HVFS.html#t:FilePath">FilePath</a> -> <a href="System-IO-HVFS.html#t:FilePath">FilePath</a> -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a><a href="src/System-IO-Utils.html#copyFileLinesToFile" class="link">Source</a></p><div class="doc"><p>Copies one filename to another in text mode.
</p><p>Please note that the Unix permission bits are set at a default; you may
need to adjust them after the copy yourself.
</p><p>This function is implemented using <code><a href="System-IO-Utils.html#v:hLineCopy">hLineCopy</a></code> internally.
</p></div></div><h1 id="g:4">Line Processing Utilities
</h1><div class="top"><p class="src"><a name="v:hPutStrLns" class="def">hPutStrLns</a> :: <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> a => a -> [<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>] -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a><a href="src/System-IO-Utils.html#hPutStrLns" class="link">Source</a></p><div class="doc"><p>Given a list of strings, output a line containing each item, adding
newlines as appropriate. The list is not expected to have newlines already.
</p></div></div><div class="top"><p class="src"><a name="v:hGetLines" class="def">hGetLines</a> :: <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> a => a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> [<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>]<a href="src/System-IO-Utils.html#hGetLines" class="link">Source</a></p><div class="doc"><p>Given a handle, returns a list of all the lines in that handle.
Thanks to lazy evaluation, this list does not have to be read all at once.
</p><p>Combined with <code><a href="System-IO-Utils.html#v:hPutStrLns">hPutStrLns</a></code>, this can make a powerful way to develop
filters. See the <code><a href="System-IO-Utils.html#v:lineInteract">lineInteract</a></code> function for more on that concept.
</p><p>Example:
</p><pre> main = do
l <- hGetLines stdin
hPutStrLns stdout $ filter (startswith "1") l
</pre></div></div><h1 id="g:5">Lazy Interaction
</h1><h2 id="g:6">Character-based
</h2><div class="top"><p class="src"><a name="v:hInteract" class="def">hInteract</a> :: (<a href="System-IO-HVIO.html#t:HVIO">HVIO</a> a, <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> b) => a -> b -> (<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a> -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>) -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a><a href="src/System-IO-Utils.html#hInteract" class="link">Source</a></p><div class="doc"><p>This is similar to the built-in <code><a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#v:interact">interact</a></code>, but works
on any handle, not just stdin and stdout.
</p><p>In other words:
</p><pre> interact = hInteract stdin stdout
</pre></div></div><h2 id="g:7">Line-based
</h2><div class="top"><p class="src"><a name="v:hLineInteract" class="def">hLineInteract</a> :: (<a href="System-IO-HVIO.html#t:HVIO">HVIO</a> a, <a href="System-IO-HVIO.html#t:HVIO">HVIO</a> b) => a -> b -> ([<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>] -> [<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>]) -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a><a href="src/System-IO-Utils.html#hLineInteract" class="link">Source</a></p><div class="doc"><p>Line-based interaction over arbitrary handles. This is similar
to wrapping hInteract with <code><a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-List.html#v:lines">lines</a></code> and <code><a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-List.html#v:unlines">unlines</a></code>.
</p><p>One could view this function like this:
</p><pre> hLineInteract finput foutput func =
let newf = unlines . func . lines in
hInteract finput foutput newf
</pre><p>Though the actual implementation is this for efficiency:
</p><pre> hLineInteract finput foutput func =
do
lines <- hGetLines finput
hPutStrLns foutput (func lines)
</pre></div></div><div class="top"><p class="src"><a name="v:lineInteract" class="def">lineInteract</a> :: ([<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>] -> [<a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-String.html#t:String">String</a>]) -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a><a href="src/System-IO-Utils.html#lineInteract" class="link">Source</a></p><div class="doc"><p>Line-based interaction. This is similar to wrapping your
interact functions with <code><a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-List.html#v:lines">lines</a></code> and <code><a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/Data-List.html#v:unlines">unlines</a></code>. This equality holds:
</p><pre> lineInteract = hLineInteract stdin stdout
</pre><p>Here's an example:
</p><pre> main = lineInteract (filter (startswith "1"))
</pre><p>This will act as a simple version of grep -- all lines that start with 1
will be displayed; all others will be ignored.
</p></div></div><h2 id="g:8">Misc. Lazy
</h2><div class="top"><p class="src"><a name="v:lazyMapM" class="def">lazyMapM</a> :: (a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> b) -> [a] -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> [b]<a href="src/System-IO-Utils.html#lazyMapM" class="link">Source</a></p><div class="doc"><p>Applies a given function to every item in a list, and returns
the new list. Unlike the system's mapM, items are evaluated lazily.
</p></div></div><h1 id="g:9">Optimizations
</h1><div class="top"><p class="src"><a name="v:optimizeForBatch" class="def">optimizeForBatch</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a><a href="src/System-IO-Utils.html#optimizeForBatch" class="link">Source</a></p><div class="doc"><p>Sets stdin and stdout to be block-buffered. This can save a huge amount
of system resources since far fewer syscalls are made, and can make programs
run much faster.
</p></div></div><div class="top"><p class="src"><a name="v:optimizeForInteraction" class="def">optimizeForInteraction</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.5.0.0/System-IO.html#t:IO">IO</a> <a href="/usr/share/doc/ghc-doc/html/libraries/ghc-prim-0.2.0.0/GHC-Tuple.html#t:-40--41-">()</a><a href="src/System-IO-Utils.html#optimizeForInteraction" class="link">Source</a></p><div class="doc"><p>Sets stdin and stdout to be line-buffered. This saves resources
on stdout, but not many on stdin, since it it still looking for newlines.
</p></div></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.10.0</p></div></body></html>
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