368 lines
56 KiB
HTML
368 lines
56 KiB
HTML
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<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
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<title>src/HPath/IO/Errors.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- |</span>
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<a name="line-2"></a><span class='hs-comment'>-- Module : HPath.IO.Errors</span>
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<a name="line-3"></a><span class='hs-comment'>-- Copyright : © 2016 Julian Ospald</span>
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<a name="line-4"></a><span class='hs-comment'>-- License : BSD3</span>
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<a name="line-5"></a><span class='hs-comment'>--</span>
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<a name="line-6"></a><span class='hs-comment'>-- Maintainer : Julian Ospald <hasufell@posteo.de></span>
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<a name="line-7"></a><span class='hs-comment'>-- Stability : experimental</span>
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<a name="line-8"></a><span class='hs-comment'>-- Portability : portable</span>
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<a name="line-9"></a><span class='hs-comment'>--</span>
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<a name="line-10"></a><span class='hs-comment'>-- Provides error handling.</span>
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<a name="line-11"></a>
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<a name="line-12"></a><span class='hs-comment'>{-# LANGUAGE DeriveDataTypeable #-}</span>
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<a name="line-13"></a><span class='hs-comment'>{-# LANGUAGE ScopedTypeVariables #-}</span>
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<a name="line-14"></a>
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<a name="line-15"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>HPath</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Errors</span>
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<a name="line-16"></a> <span class='hs-layout'>(</span>
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<a name="line-17"></a> <span class='hs-comment'>-- * Types</span>
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<a name="line-18"></a> <span class='hs-conid'>HPathIOException</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
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<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>RecursiveFailureHint</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
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<a name="line-20"></a>
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<a name="line-21"></a> <span class='hs-comment'>-- * Exception identifiers</span>
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<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isSameFile</span>
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<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isDestinationInSource</span>
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<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isRecursiveFailure</span>
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<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isReadContentsFailed</span>
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<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isCreateDirFailed</span>
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<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isCopyFileFailed</span>
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<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isRecreateSymlinkFailed</span>
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<a name="line-29"></a>
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<a name="line-30"></a> <span class='hs-comment'>-- * Path based functions</span>
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<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>throwFileDoesExist</span>
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<a name="line-32"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>throwDirDoesExist</span>
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<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>throwSameFile</span>
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<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>sameFile</span>
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<a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>throwDestinationInSource</span>
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<a name="line-36"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>doesFileExist</span>
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<a name="line-37"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>doesDirectoryExist</span>
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<a name="line-38"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isWritable</span>
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<a name="line-39"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>canOpenDirectory</span>
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<a name="line-40"></a>
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<a name="line-41"></a> <span class='hs-comment'>-- * Error handling functions</span>
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<a name="line-42"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>catchErrno</span>
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<a name="line-43"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>rethrowErrnoAs</span>
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<a name="line-44"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>handleIOError</span>
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<a name="line-45"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>bracketeer</span>
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<a name="line-46"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>reactOnError</span>
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<a name="line-47"></a> <span class='hs-layout'>)</span>
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<a name="line-48"></a> <span class='hs-keyword'>where</span>
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<a name="line-49"></a>
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<a name="line-50"></a>
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<a name="line-51"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span>
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<a name="line-52"></a> <span class='hs-layout'>(</span>
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<a name="line-53"></a> <span class='hs-layout'>(</span><span class='hs-varop'><$></span><span class='hs-layout'>)</span>
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<a name="line-54"></a> <span class='hs-layout'>)</span>
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<a name="line-55"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span>
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<a name="line-56"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
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<a name="line-57"></a> <span class='hs-layout'>(</span>
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<a name="line-58"></a> <span class='hs-varid'>forM</span>
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<a name="line-59"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>when</span>
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<a name="line-60"></a> <span class='hs-layout'>)</span>
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<a name="line-61"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>IfElse</span>
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<a name="line-62"></a> <span class='hs-layout'>(</span>
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<a name="line-63"></a> <span class='hs-varid'>whenM</span>
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<a name="line-64"></a> <span class='hs-layout'>)</span>
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<a name="line-65"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span>
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<a name="line-66"></a> <span class='hs-layout'>(</span>
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<a name="line-67"></a> <span class='hs-conid'>ByteString</span>
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<a name="line-68"></a> <span class='hs-layout'>)</span>
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<a name="line-69"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>UTF8</span>
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<a name="line-70"></a> <span class='hs-layout'>(</span>
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<a name="line-71"></a> <span class='hs-varid'>toString</span>
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<a name="line-72"></a> <span class='hs-layout'>)</span>
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<a name="line-73"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Typeable</span>
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<a name="line-74"></a> <span class='hs-layout'>(</span>
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<a name="line-75"></a> <span class='hs-conid'>Typeable</span>
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<a name="line-76"></a> <span class='hs-layout'>)</span>
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<a name="line-77"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span>
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<a name="line-78"></a> <span class='hs-layout'>(</span>
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<a name="line-79"></a> <span class='hs-varid'>getErrno</span>
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<a name="line-80"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Errno</span>
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<a name="line-81"></a> <span class='hs-layout'>)</span>
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<a name="line-82"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span>
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<a name="line-83"></a> <span class='hs-layout'>(</span>
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<a name="line-84"></a> <span class='hs-conid'>IOErrorType</span>
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<a name="line-85"></a> <span class='hs-layout'>)</span>
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<a name="line-86"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>HPath</span>
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<a name="line-87"></a><span class='hs-keyword'>import</span> <span class='hs-comment'>{-# SOURCE #-}</span> <span class='hs-conid'>HPath</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span>
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<a name="line-88"></a> <span class='hs-layout'>(</span>
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<a name="line-89"></a> <span class='hs-varid'>canonicalizePath</span>
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<a name="line-90"></a> <span class='hs-layout'>)</span>
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<a name="line-91"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span>
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<a name="line-92"></a> <span class='hs-layout'>(</span>
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<a name="line-93"></a> <span class='hs-varid'>alreadyExistsErrorType</span>
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<a name="line-94"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>catchIOError</span>
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<a name="line-95"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ioeGetErrorType</span>
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<a name="line-96"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkIOError</span>
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<a name="line-97"></a> <span class='hs-layout'>)</span>
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<a name="line-98"></a>
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<a name="line-99"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>Directory</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>PFD</span>
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<a name="line-100"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>Files</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span>
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<a name="line-101"></a> <span class='hs-layout'>(</span>
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<a name="line-102"></a> <span class='hs-varid'>fileAccess</span>
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<a name="line-103"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>getFileStatus</span>
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<a name="line-104"></a> <span class='hs-layout'>)</span>
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<a name="line-105"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>Files</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>PF</span>
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<a name="line-106"></a>
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<a name="line-107"></a>
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<a name="line-108"></a><a name="HPathIOException"></a><span class='hs-comment'>-- |Additional generic IO exceptions that the posix functions</span>
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<a name="line-109"></a><a name="HPathIOException"></a><span class='hs-comment'>-- do not provide.</span>
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<a name="line-110"></a><a name="HPathIOException"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>HPathIOException</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SameFile</span> <span class='hs-conid'>ByteString</span> <span class='hs-conid'>ByteString</span>
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<a name="line-111"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>DestinationInSource</span> <span class='hs-conid'>ByteString</span> <span class='hs-conid'>ByteString</span>
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<a name="line-112"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>RecursiveFailure</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>RecursiveFailureHint</span><span class='hs-layout'>,</span> <span class='hs-conid'>IOException</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
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<a name="line-113"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
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<a name="line-114"></a>
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<a name="line-115"></a>
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<a name="line-116"></a><a name="RecursiveFailureHint"></a><span class='hs-comment'>-- |A type for giving failure hints on recursive failure, which allows</span>
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<a name="line-117"></a><a name="RecursiveFailureHint"></a><span class='hs-comment'>-- to programmatically make choices without examining</span>
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<a name="line-118"></a><a name="RecursiveFailureHint"></a><span class='hs-comment'>-- the weakly typed I/O error attributes (like `ioeGetFileName`).</span>
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<a name="line-119"></a><a name="RecursiveFailureHint"></a><span class='hs-comment'>--</span>
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<a name="line-120"></a><a name="RecursiveFailureHint"></a><span class='hs-comment'>-- The first argument to the data constructor is always the</span>
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<a name="line-121"></a><a name="RecursiveFailureHint"></a><span class='hs-comment'>-- source and the second the destination.</span>
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<a name="line-122"></a><a name="RecursiveFailureHint"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>RecursiveFailureHint</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ReadContentsFailed</span> <span class='hs-layout'>(</span><span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span><span class='hs-layout'>)</span>
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<a name="line-123"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CreateDirFailed</span> <span class='hs-layout'>(</span><span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span><span class='hs-layout'>)</span>
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<a name="line-124"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CopyFileFailed</span> <span class='hs-layout'>(</span><span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span><span class='hs-layout'>)</span>
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<a name="line-125"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>RecreateSymlinkFailed</span> <span class='hs-layout'>(</span><span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span><span class='hs-layout'>)</span>
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<a name="line-126"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
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<a name="line-127"></a>
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<a name="line-128"></a>
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<a name="line-129"></a><a name="instance%20%5bErrno%5d%20--%20%5e%20errno%20to%20catch%20-%3e%20e%20--%20%5e%20rethrow%20as%20if%20errno%20matches%20-%3e%20IO%20a%20--%20%5e%20action%20to%20try%20-%3e%20IO%20a%20rethrowErrnoAs%20en%20fmex%20action%20=%20catchErrno%20en%20action%20(throwIO%20fmex)%20--%20%7cLike%20%60catchIOError%60,%20with%20arguments%20swapped.%20handleIOError%20::%20(IOError%20-%3e%20IO%20a)%20-%3e%20IO%20a%20-%3e%20IO%20a%20handleIOError%20=%20flip%20catchIOError%20--%20%7cLike%20%60bracket%60,%20but%20allows%20to%20have%20different%20clean-up%20--%20actions%20depending%20on%20whether%20the%20in-between%20computation%20--%20has%20raised%20an%20exception%20or%20not.%20bracketeer%20::%20IO%20a%20--%20%5e%20computation%20to%20run%20first%20-%3e%20(a%20-%3e%20IO%20b)%20--%20%5e%20computation%20to%20run%20last,%20when%20--%20no%20exception%20was%20raised%20-%3e%20(a%20-%3e%20IO%20b)%20--%20%5e%20computation%20to%20run%20last,%20--%20when%20an%20exception%20was%20raised%20-%3e%20(a%20-%3e%20IO%20c)%20--%20%5e%20computation%20to%20run%20in-between%20-%3e%20IO%20c%20bracketeer%20before%20after%20afterEx%20thing%20=%20mask%20$%20%5crestore%20-%3e%20do%20a%20%3c-%20before%20r%20%3c-%20restore%20(thing%20a)%20%60onException%60%20afterEx%20a%20_%20%3c-%20after%20a%20return%20r%20reactOnError%20::%20IO%20a%20-%3e%20%5b(IOErrorType,%20IO%20a)%5d%20--%20%5e%20reaction%20on%20IO%20errors%20-%3e%20%5b(HPathIOException,%20IO%20a)%5d%20--%20%5e%20reaction%20on%20HPathIOException%20-%3e%20IO%20a%20reactOnError%20a%20ios%20fmios%20=%20a%20%60catches%60%20%5biohandler,%20fmiohandler%5d"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Exception</span> <span class='hs-conid'>HPathIOException</span>
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<a name="line-130"></a>
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<a name="line-131"></a>
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<a name="line-132"></a><a name="toConstr"></a><span class='hs-definition'>toConstr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HPathIOException</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
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<a name="line-133"></a><span class='hs-definition'>toConstr</span> <span class='hs-conid'>SameFile</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"SameFile"</span>
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<a name="line-134"></a><span class='hs-definition'>toConstr</span> <span class='hs-conid'>DestinationInSource</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"DestinationInSource"</span>
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<a name="line-135"></a><span class='hs-definition'>toConstr</span> <span class='hs-conid'>RecursiveFailure</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"RecursiveFailure"</span>
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<a name="line-136"></a>
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<a name="line-137"></a>
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<a name="line-138"></a>
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<a name="line-140"></a>
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<a name="line-141"></a> <span class='hs-comment'>-----------------------------</span>
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<a name="line-142"></a> <span class='hs-comment'>--[ Exception identifiers ]--</span>
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<a name="line-143"></a> <span class='hs-comment'>-----------------------------</span>
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<a name="line-144"></a>
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<a name="line-145"></a>
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<a name="line-146"></a><a name="isSameFile"></a><span class='hs-definition'>isSameFile</span><span class='hs-layout'>,</span> <span class='hs-varid'>isDestinationInSource</span><span class='hs-layout'>,</span> <span class='hs-varid'>isRecursiveFailure</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HPathIOException</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
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<a name="line-147"></a><span class='hs-definition'>isSameFile</span> <span class='hs-varid'>ex</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toConstr</span> <span class='hs-layout'>(</span><span class='hs-varid'>ex</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HPathIOException</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span> <span class='hs-varid'>toConstr</span> <span class='hs-conid'>SameFile</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span>
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<a name="line-148"></a><a name="isDestinationInSource"></a><span class='hs-definition'>isDestinationInSource</span> <span class='hs-varid'>ex</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toConstr</span> <span class='hs-layout'>(</span><span class='hs-varid'>ex</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HPathIOException</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span> <span class='hs-varid'>toConstr</span> <span class='hs-conid'>DestinationInSource</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span>
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<a name="line-149"></a><a name="isRecursiveFailure"></a><span class='hs-definition'>isRecursiveFailure</span> <span class='hs-varid'>ex</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toConstr</span> <span class='hs-layout'>(</span><span class='hs-varid'>ex</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HPathIOException</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span> <span class='hs-varid'>toConstr</span> <span class='hs-conid'>RecursiveFailure</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span>
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<a name="line-150"></a>
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<a name="line-151"></a>
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<a name="line-152"></a><a name="isReadContentsFailed"></a><span class='hs-definition'>isReadContentsFailed</span><span class='hs-layout'>,</span> <span class='hs-varid'>isCreateDirFailed</span><span class='hs-layout'>,</span> <span class='hs-varid'>isCopyFileFailed</span><span class='hs-layout'>,</span> <span class='hs-varid'>isRecreateSymlinkFailed</span> <span class='hs-keyglyph'>::</span><span class='hs-conid'>RecursiveFailureHint</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
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<a name="line-153"></a><span class='hs-definition'>isReadContentsFailed</span> <span class='hs-conid'>ReadContentsFailed</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
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<a name="line-154"></a><span class='hs-definition'>isReadContentsFailed</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
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<a name="line-155"></a><a name="isCreateDirFailed"></a><span class='hs-definition'>isCreateDirFailed</span> <span class='hs-conid'>CreateDirFailed</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
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<a name="line-156"></a><span class='hs-definition'>isCreateDirFailed</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
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<a name="line-157"></a><a name="isCopyFileFailed"></a><span class='hs-definition'>isCopyFileFailed</span> <span class='hs-conid'>CopyFileFailed</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
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<a name="line-158"></a><span class='hs-definition'>isCopyFileFailed</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
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<a name="line-159"></a><a name="isRecreateSymlinkFailed"></a><span class='hs-definition'>isRecreateSymlinkFailed</span> <span class='hs-conid'>RecreateSymlinkFailed</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
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<a name="line-160"></a><span class='hs-definition'>isRecreateSymlinkFailed</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
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<a name="line-161"></a>
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<a name="line-162"></a>
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<a name="line-163"></a>
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<a name="line-164"></a>
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<a name="line-165"></a>
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<a name="line-166"></a> <span class='hs-comment'>----------------------------</span>
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<a name="line-167"></a> <span class='hs-comment'>--[ Path based functions ]--</span>
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<a name="line-168"></a> <span class='hs-comment'>----------------------------</span>
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<a name="line-169"></a>
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<a name="line-170"></a>
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<a name="line-171"></a><a name="throwFileDoesExist"></a><span class='hs-comment'>-- |Throws `AlreadyExists` `IOError` if file exists.</span>
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<a name="line-172"></a><span class='hs-definition'>throwFileDoesExist</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
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<a name="line-173"></a><span class='hs-definition'>throwFileDoesExist</span> <span class='hs-varid'>fp</span> <span class='hs-keyglyph'>=</span>
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<a name="line-174"></a> <span class='hs-varid'>whenM</span> <span class='hs-layout'>(</span><span class='hs-varid'>doesFileExist</span> <span class='hs-varid'>fp</span><span class='hs-layout'>)</span>
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<a name="line-175"></a> <span class='hs-layout'>(</span><span class='hs-varid'>ioError</span> <span class='hs-varop'>.</span> <span class='hs-varid'>mkIOError</span>
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<a name="line-176"></a> <span class='hs-varid'>alreadyExistsErrorType</span>
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<a name="line-177"></a> <span class='hs-str'>"File already exists"</span>
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<a name="line-178"></a> <span class='hs-conid'>Nothing</span>
|
|
<a name="line-179"></a> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>toString</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromAbs</span> <span class='hs-varid'>fp</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
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<a name="line-180"></a> <span class='hs-layout'>)</span>
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<a name="line-181"></a>
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<a name="line-182"></a>
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<a name="line-183"></a><a name="throwDirDoesExist"></a><span class='hs-comment'>-- |Throws `AlreadyExists` `IOError` if directory exists.</span>
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<a name="line-184"></a><span class='hs-definition'>throwDirDoesExist</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
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<a name="line-185"></a><span class='hs-definition'>throwDirDoesExist</span> <span class='hs-varid'>fp</span> <span class='hs-keyglyph'>=</span>
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<a name="line-186"></a> <span class='hs-varid'>whenM</span> <span class='hs-layout'>(</span><span class='hs-varid'>doesDirectoryExist</span> <span class='hs-varid'>fp</span><span class='hs-layout'>)</span>
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<a name="line-187"></a> <span class='hs-layout'>(</span><span class='hs-varid'>ioError</span> <span class='hs-varop'>.</span> <span class='hs-varid'>mkIOError</span>
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|
<a name="line-188"></a> <span class='hs-varid'>alreadyExistsErrorType</span>
|
|
<a name="line-189"></a> <span class='hs-str'>"Directory already exists"</span>
|
|
<a name="line-190"></a> <span class='hs-conid'>Nothing</span>
|
|
<a name="line-191"></a> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>toString</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromAbs</span> <span class='hs-varid'>fp</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
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<a name="line-192"></a> <span class='hs-layout'>)</span>
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<a name="line-193"></a>
|
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<a name="line-194"></a>
|
|
<a name="line-195"></a><a name="throwSameFile"></a><span class='hs-comment'>-- |Uses `isSameFile` and throws `SameFile` if it returns True.</span>
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<a name="line-196"></a><span class='hs-definition'>throwSameFile</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span>
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<a name="line-197"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span>
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<a name="line-198"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
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<a name="line-199"></a><span class='hs-definition'>throwSameFile</span> <span class='hs-varid'>fp1</span> <span class='hs-varid'>fp2</span> <span class='hs-keyglyph'>=</span>
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<a name="line-200"></a> <span class='hs-varid'>whenM</span> <span class='hs-layout'>(</span><span class='hs-varid'>sameFile</span> <span class='hs-varid'>fp1</span> <span class='hs-varid'>fp2</span><span class='hs-layout'>)</span>
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<a name="line-201"></a> <span class='hs-layout'>(</span><span class='hs-varid'>throwIO</span> <span class='hs-varop'>$</span> <span class='hs-conid'>SameFile</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromAbs</span> <span class='hs-varid'>fp1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromAbs</span> <span class='hs-varid'>fp2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
|
|
<a name="line-202"></a>
|
|
<a name="line-203"></a>
|
|
<a name="line-204"></a><a name="sameFile"></a><span class='hs-comment'>-- |Check if the files are the same by examining device and file id.</span>
|
|
<a name="line-205"></a><span class='hs-comment'>-- This follows symbolic links.</span>
|
|
<a name="line-206"></a><span class='hs-definition'>sameFile</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
|
|
<a name="line-207"></a><span class='hs-definition'>sameFile</span> <span class='hs-varid'>fp1</span> <span class='hs-varid'>fp2</span> <span class='hs-keyglyph'>=</span>
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<a name="line-208"></a> <span class='hs-varid'>withAbsPath</span> <span class='hs-varid'>fp1</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>fp1'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>withAbsPath</span> <span class='hs-varid'>fp2</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>fp2'</span> <span class='hs-keyglyph'>-></span>
|
|
<a name="line-209"></a> <span class='hs-varid'>handleIOError</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
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<a name="line-210"></a> <span class='hs-varid'>fs1</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getFileStatus</span> <span class='hs-varid'>fp1'</span>
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|
<a name="line-211"></a> <span class='hs-varid'>fs2</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getFileStatus</span> <span class='hs-varid'>fp2'</span>
|
|
<a name="line-212"></a>
|
|
<a name="line-213"></a> <span class='hs-keyword'>if</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>deviceID</span> <span class='hs-varid'>fs1</span><span class='hs-layout'>,</span> <span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>fileID</span> <span class='hs-varid'>fs1</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span>
|
|
<a name="line-214"></a> <span class='hs-layout'>(</span><span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>deviceID</span> <span class='hs-varid'>fs2</span><span class='hs-layout'>,</span> <span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>fileID</span> <span class='hs-varid'>fs2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
|
|
<a name="line-215"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
|
|
<a name="line-216"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
|
|
<a name="line-217"></a>
|
|
<a name="line-218"></a>
|
|
<a name="line-219"></a><a name="throwDestinationInSource"></a><span class='hs-comment'>-- TODO: make this more robust when destination does not exist</span>
|
|
<a name="line-220"></a><span class='hs-comment'>-- |Checks whether the destination directory is contained</span>
|
|
<a name="line-221"></a><span class='hs-comment'>-- within the source directory by comparing the device+file ID of the</span>
|
|
<a name="line-222"></a><span class='hs-comment'>-- source directory with all device+file IDs of the parent directories</span>
|
|
<a name="line-223"></a><span class='hs-comment'>-- of the destination.</span>
|
|
<a name="line-224"></a><span class='hs-definition'>throwDestinationInSource</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span> <span class='hs-comment'>-- ^ source dir</span>
|
|
<a name="line-225"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span> <span class='hs-comment'>-- ^ full destination, @dirname dest@</span>
|
|
<a name="line-226"></a> <span class='hs-comment'>-- must exist</span>
|
|
<a name="line-227"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
|
|
<a name="line-228"></a><span class='hs-definition'>throwDestinationInSource</span> <span class='hs-varid'>source</span> <span class='hs-varid'>dest</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
|
|
<a name="line-229"></a> <span class='hs-varid'>dest'</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span> <span class='hs-varop'></></span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>basename</span> <span class='hs-varid'>dest</span><span class='hs-layout'>)</span>
|
|
<a name="line-230"></a> <span class='hs-varop'><$></span> <span class='hs-layout'>(</span><span class='hs-varid'>canonicalizePath</span> <span class='hs-varop'>$</span> <span class='hs-varid'>dirname</span> <span class='hs-varid'>dest</span><span class='hs-layout'>)</span>
|
|
<a name="line-231"></a> <span class='hs-varid'>dids</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>forM</span> <span class='hs-layout'>(</span><span class='hs-varid'>getAllParents</span> <span class='hs-varid'>dest'</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>p</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
|
|
<a name="line-232"></a> <span class='hs-varid'>fs</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>getSymbolicLinkStatus</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromAbs</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
|
|
<a name="line-233"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>deviceID</span> <span class='hs-varid'>fs</span><span class='hs-layout'>,</span> <span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>fileID</span> <span class='hs-varid'>fs</span><span class='hs-layout'>)</span>
|
|
<a name="line-234"></a> <span class='hs-varid'>sid</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>deviceID</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>fileID</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
|
|
<a name="line-235"></a> <span class='hs-varop'>$</span> <span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>getFileStatus</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromAbs</span> <span class='hs-varid'>source</span><span class='hs-layout'>)</span>
|
|
<a name="line-236"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>elem</span> <span class='hs-varid'>sid</span> <span class='hs-varid'>dids</span><span class='hs-layout'>)</span>
|
|
<a name="line-237"></a> <span class='hs-layout'>(</span><span class='hs-varid'>throwIO</span> <span class='hs-varop'>$</span> <span class='hs-conid'>DestinationInSource</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromAbs</span> <span class='hs-varid'>dest</span><span class='hs-layout'>)</span>
|
|
<a name="line-238"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fromAbs</span> <span class='hs-varid'>source</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
|
|
<a name="line-239"></a>
|
|
<a name="line-240"></a>
|
|
<a name="line-241"></a><a name="doesFileExist"></a><span class='hs-comment'>-- |Checks if the given file exists and is not a directory.</span>
|
|
<a name="line-242"></a><span class='hs-comment'>-- Does not follow symlinks.</span>
|
|
<a name="line-243"></a><span class='hs-definition'>doesFileExist</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
|
|
<a name="line-244"></a><span class='hs-definition'>doesFileExist</span> <span class='hs-varid'>fp</span> <span class='hs-keyglyph'>=</span>
|
|
<a name="line-245"></a> <span class='hs-varid'>handleIOError</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
|
|
<a name="line-246"></a> <span class='hs-varid'>fs</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>getSymbolicLinkStatus</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromAbs</span> <span class='hs-varid'>fp</span><span class='hs-layout'>)</span>
|
|
<a name="line-247"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>isDirectory</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fs</span>
|
|
<a name="line-248"></a>
|
|
<a name="line-249"></a>
|
|
<a name="line-250"></a><a name="doesDirectoryExist"></a><span class='hs-comment'>-- |Checks if the given file exists and is a directory.</span>
|
|
<a name="line-251"></a><span class='hs-comment'>-- Does not follow symlinks.</span>
|
|
<a name="line-252"></a><span class='hs-definition'>doesDirectoryExist</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
|
|
<a name="line-253"></a><span class='hs-definition'>doesDirectoryExist</span> <span class='hs-varid'>fp</span> <span class='hs-keyglyph'>=</span>
|
|
<a name="line-254"></a> <span class='hs-varid'>handleIOError</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
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<a name="line-255"></a> <span class='hs-varid'>fs</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>getSymbolicLinkStatus</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromAbs</span> <span class='hs-varid'>fp</span><span class='hs-layout'>)</span>
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<a name="line-256"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PF</span><span class='hs-varop'>.</span><span class='hs-varid'>isDirectory</span> <span class='hs-varid'>fs</span>
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<a name="line-257"></a>
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<a name="line-258"></a>
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<a name="line-259"></a><a name="isWritable"></a><span class='hs-comment'>-- |Checks whether a file or folder is writable.</span>
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<a name="line-260"></a><span class='hs-definition'>isWritable</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
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<a name="line-261"></a><span class='hs-definition'>isWritable</span> <span class='hs-varid'>fp</span> <span class='hs-keyglyph'>=</span>
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<a name="line-262"></a> <span class='hs-varid'>handleIOError</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
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<a name="line-263"></a> <span class='hs-varid'>fileAccess</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromAbs</span> <span class='hs-varid'>fp</span><span class='hs-layout'>)</span> <span class='hs-conid'>False</span> <span class='hs-conid'>True</span> <span class='hs-conid'>False</span>
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<a name="line-264"></a>
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<a name="line-265"></a>
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<a name="line-266"></a><a name="canOpenDirectory"></a><span class='hs-comment'>-- |Checks whether the directory at the given path exists and can be</span>
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<a name="line-267"></a><span class='hs-comment'>-- opened. This invokes `openDirStream` which follows symlinks.</span>
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<a name="line-268"></a><span class='hs-definition'>canOpenDirectory</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Path</span> <span class='hs-conid'>Abs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
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<a name="line-269"></a><span class='hs-definition'>canOpenDirectory</span> <span class='hs-varid'>fp</span> <span class='hs-keyglyph'>=</span>
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<a name="line-270"></a> <span class='hs-varid'>handleIOError</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
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|
<a name="line-271"></a> <span class='hs-varid'>bracket</span> <span class='hs-layout'>(</span><span class='hs-conid'>PFD</span><span class='hs-varop'>.</span><span class='hs-varid'>openDirStream</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fromAbs</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fp</span><span class='hs-layout'>)</span>
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<a name="line-272"></a> <span class='hs-conid'>PFD</span><span class='hs-varop'>.</span><span class='hs-varid'>closeDirStream</span>
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<a name="line-273"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
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<a name="line-274"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
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|
<a name="line-275"></a>
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<a name="line-276"></a>
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<a name="line-277"></a>
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<a name="line-278"></a>
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<a name="line-279"></a> <span class='hs-comment'>--------------------------------</span>
|
|
<a name="line-280"></a> <span class='hs-comment'>--[ Error handling functions ]--</span>
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<a name="line-281"></a> <span class='hs-comment'>--------------------------------</span>
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<a name="line-282"></a>
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<a name="line-283"></a>
|
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<a name="line-284"></a><a name="catchErrno"></a><span class='hs-comment'>-- |Carries out an action, then checks if there is an IOException and</span>
|
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<a name="line-285"></a><span class='hs-comment'>-- a specific errno. If so, then it carries out another action, otherwise</span>
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<a name="line-286"></a><span class='hs-comment'>-- it rethrows the error.</span>
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<a name="line-287"></a><span class='hs-definition'>catchErrno</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Errno</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ errno to catch</span>
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<a name="line-288"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ action to try, which can raise an IOException</span>
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<a name="line-289"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ action to carry out in case of an IOException and</span>
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<a name="line-290"></a> <span class='hs-comment'>-- if errno matches</span>
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<a name="line-291"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
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<a name="line-292"></a><span class='hs-definition'>catchErrno</span> <span class='hs-varid'>en</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-keyglyph'>=</span>
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<a name="line-293"></a> <span class='hs-varid'>catchIOError</span> <span class='hs-varid'>a1</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
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<a name="line-294"></a> <span class='hs-varid'>errno</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getErrno</span>
|
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<a name="line-295"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>errno</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>en</span>
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<a name="line-296"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>a2</span>
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<a name="line-297"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>ioError</span> <span class='hs-varid'>e</span>
|
|
<a name="line-298"></a>
|
|
<a name="line-299"></a>
|
|
<a name="line-300"></a><a name="rethrowErrnoAs"></a><span class='hs-comment'>-- |Execute the given action and retrow IO exceptions as a new Exception</span>
|
|
<a name="line-301"></a><span class='hs-comment'>-- that have the given errno. If errno does not match the exception is rethrown</span>
|
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<a name="line-302"></a><span class='hs-comment'>-- as is.</span>
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<a name="line-303"></a><span class='hs-definition'>rethrowErrnoAs</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span>
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|
<a name="line-304"></a> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Errno</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ errno to catch</span>
|
|
<a name="line-305"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>e</span> <span class='hs-comment'>-- ^ rethrow as if errno matches</span>
|
|
<a name="line-306"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ action to try</span>
|
|
<a name="line-307"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
|
|
<a name="line-308"></a><span class='hs-definition'>rethrowErrnoAs</span> <span class='hs-varid'>en</span> <span class='hs-varid'>fmex</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catchErrno</span> <span class='hs-varid'>en</span> <span class='hs-varid'>action</span> <span class='hs-layout'>(</span><span class='hs-varid'>throwIO</span> <span class='hs-varid'>fmex</span><span class='hs-layout'>)</span>
|
|
<a name="line-309"></a>
|
|
<a name="line-310"></a>
|
|
<a name="line-311"></a>
|
|
<a name="line-312"></a><a name="handleIOError"></a><span class='hs-comment'>-- |Like `catchIOError`, with arguments swapped.</span>
|
|
<a name="line-313"></a><span class='hs-definition'>handleIOError</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>IOError</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
|
|
<a name="line-314"></a><span class='hs-definition'>handleIOError</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flip</span> <span class='hs-varid'>catchIOError</span>
|
|
<a name="line-315"></a>
|
|
<a name="line-316"></a>
|
|
<a name="line-317"></a><a name="bracketeer"></a><span class='hs-comment'>-- |Like `bracket`, but allows to have different clean-up</span>
|
|
<a name="line-318"></a><span class='hs-comment'>-- actions depending on whether the in-between computation</span>
|
|
<a name="line-319"></a><span class='hs-comment'>-- has raised an exception or not. </span>
|
|
<a name="line-320"></a><span class='hs-definition'>bracketeer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ computation to run first</span>
|
|
<a name="line-321"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ computation to run last, when</span>
|
|
<a name="line-322"></a> <span class='hs-comment'>-- no exception was raised</span>
|
|
<a name="line-323"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ computation to run last,</span>
|
|
<a name="line-324"></a> <span class='hs-comment'>-- when an exception was raised</span>
|
|
<a name="line-325"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ computation to run in-between</span>
|
|
<a name="line-326"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>c</span>
|
|
<a name="line-327"></a><span class='hs-definition'>bracketeer</span> <span class='hs-varid'>before</span> <span class='hs-varid'>after</span> <span class='hs-varid'>afterEx</span> <span class='hs-varid'>thing</span> <span class='hs-keyglyph'>=</span>
|
|
<a name="line-328"></a> <span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>restore</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
|
|
<a name="line-329"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>before</span>
|
|
<a name="line-330"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>restore</span> <span class='hs-layout'>(</span><span class='hs-varid'>thing</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varop'>`onException`</span> <span class='hs-varid'>afterEx</span> <span class='hs-varid'>a</span>
|
|
<a name="line-331"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>after</span> <span class='hs-varid'>a</span>
|
|
<a name="line-332"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>r</span>
|
|
<a name="line-333"></a>
|
|
<a name="line-334"></a>
|
|
<a name="line-335"></a><a name="reactOnError"></a><span class='hs-definition'>reactOnError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
|
|
<a name="line-336"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>IOErrorType</span><span class='hs-layout'>,</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ reaction on IO errors</span>
|
|
<a name="line-337"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>HPathIOException</span><span class='hs-layout'>,</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ reaction on HPathIOException</span>
|
|
<a name="line-338"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
|
|
<a name="line-339"></a><span class='hs-definition'>reactOnError</span> <span class='hs-varid'>a</span> <span class='hs-varid'>ios</span> <span class='hs-varid'>fmios</span> <span class='hs-keyglyph'>=</span>
|
|
<a name="line-340"></a> <span class='hs-varid'>a</span> <span class='hs-varop'>`catches`</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>iohandler</span><span class='hs-layout'>,</span> <span class='hs-varid'>fmiohandler</span><span class='hs-keyglyph'>]</span>
|
|
<a name="line-341"></a> <span class='hs-keyword'>where</span>
|
|
<a name="line-342"></a> <span class='hs-varid'>iohandler</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Handler</span> <span class='hs-varop'>$</span>
|
|
<a name="line-343"></a> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>ex</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IOException</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
|
|
<a name="line-344"></a> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-varid'>a'</span><span class='hs-layout'>)</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>if</span> <span class='hs-varid'>ioeGetErrorType</span> <span class='hs-varid'>ex</span> <span class='hs-varop'>==</span> <span class='hs-varid'>t</span>
|
|
<a name="line-345"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>a'</span>
|
|
<a name="line-346"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
|
|
<a name="line-347"></a> <span class='hs-layout'>(</span><span class='hs-varid'>throwIO</span> <span class='hs-varid'>ex</span><span class='hs-layout'>)</span>
|
|
<a name="line-348"></a> <span class='hs-varid'>ios</span>
|
|
<a name="line-349"></a> <span class='hs-varid'>fmiohandler</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Handler</span> <span class='hs-varop'>$</span>
|
|
<a name="line-350"></a> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>ex</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HPathIOException</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
|
|
<a name="line-351"></a> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-varid'>a'</span><span class='hs-layout'>)</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>if</span> <span class='hs-varid'>toConstr</span> <span class='hs-varid'>ex</span> <span class='hs-varop'>==</span> <span class='hs-varid'>toConstr</span> <span class='hs-varid'>t</span>
|
|
<a name="line-352"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>a'</span>
|
|
<a name="line-353"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
|
|
<a name="line-354"></a> <span class='hs-layout'>(</span><span class='hs-varid'>throwIO</span> <span class='hs-varid'>ex</span><span class='hs-layout'>)</span>
|
|
<a name="line-355"></a> <span class='hs-varid'>fmios</span>
|
|
<a name="line-356"></a>
|
|
</pre></body>
|
|
</html>
|