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<title>src/Darcs/Utils.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP, ForeignFunctionInterface #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Exec</span>
<a name="line-5"></a><span class='hs-comment'>-- Maintainer : darcs-devel@darcs.net</span>
<a name="line-6"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-7"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- Various utility functions that do not belong anywhere else.</span>
<a name="line-10"></a>
<a name="line-11"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span>
<a name="line-12"></a> <span class='hs-layout'>(</span>
<a name="line-13"></a> <span class='hs-varid'>ortryrunning</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>nubsort</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>breakCommand</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>showHexLen</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>maybeGetEnv</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>formatPath</span>
<a name="line-19"></a> <span class='hs-comment'>-- * Monads</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>firstJustIO</span>
<a name="line-21"></a> <span class='hs-comment'>-- * User prompts</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>askEnter</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>askUser</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>askUserListItem</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>PromptConfig</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>promptYorn</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>promptChar</span>
<a name="line-28"></a> <span class='hs-comment'>-- * Text</span>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>getViewer</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>editFile</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>runEditor</span>
<a name="line-32"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stripCr</span>
<a name="line-33"></a> <span class='hs-comment'>-- * Help</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>environmentHelpEditor</span>
<a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>environmentHelpPager</span>
<a name="line-36"></a> <span class='hs-comment'>-- * Errors and exceptions</span>
<a name="line-37"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>catchall</span>
<a name="line-38"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>clarifyErrors</span>
<a name="line-39"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>prettyException</span>
<a name="line-40"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>prettyError</span>
<a name="line-41"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>addToErrorLoc</span>
<a name="line-42"></a> <span class='hs-comment'>-- * Files and directories</span>
<a name="line-43"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>getFileStatus</span>
<a name="line-44"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>withCurrentDirectory</span>
<a name="line-45"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>withUMask</span>
<a name="line-46"></a> <span class='hs-comment'>-- * Locales</span>
<a name="line-47"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>setDarcsEncodings</span>
<a name="line-48"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>getSystemEncoding</span>
<a name="line-49"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isUTF8Locale</span>
<a name="line-50"></a> <span class='hs-comment'>-- * Tree filtering.</span>
<a name="line-51"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>filterFilePaths</span>
<a name="line-52"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>filterPaths</span>
<a name="line-53"></a> <span class='hs-comment'>-- * Tree lookup.</span>
<a name="line-54"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>treeHas</span>
<a name="line-55"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>treeHasDir</span>
<a name="line-56"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>treeHasFile</span>
<a name="line-57"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>treeHasAnycase</span>
<a name="line-58"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-59"></a>
<a name="line-60"></a>
<a name="line-61"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span> <span class='hs-varid'>catch</span> <span class='hs-layout'>)</span>
<a name="line-62"></a>
<a name="line-63"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-conid'>Extensible</span>
<a name="line-64"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>bracket</span><span class='hs-layout'>,</span> <span class='hs-varid'>bracket_</span><span class='hs-layout'>,</span> <span class='hs-varid'>catch</span><span class='hs-layout'>,</span> <span class='hs-varid'>try</span><span class='hs-layout'>,</span>
<a name="line-65"></a> <span class='hs-conid'>IOException</span><span class='hs-layout'>,</span> <span class='hs-conid'>SomeException</span><span class='hs-layout'>,</span> <span class='hs-conid'>Exception</span><span class='hs-layout'>(</span><span class='hs-varid'>fromException</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-66"></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-layout'>(</span> <span class='hs-varid'>when</span><span class='hs-layout'>,</span> <span class='hs-varid'>forM</span> <span class='hs-layout'>)</span>
<a name="line-67"></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'>Error</span><span class='hs-layout'>(</span> <span class='hs-conid'>MonadError</span> <span class='hs-layout'>)</span>
<a name="line-68"></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'>State</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span><span class='hs-layout'>(</span> <span class='hs-varid'>gets</span> <span class='hs-layout'>)</span>
<a name="line-69"></a>
<a name="line-70"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>B</span> <span class='hs-layout'>(</span> <span class='hs-varid'>readFile</span> <span class='hs-layout'>)</span>
<a name="line-71"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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'>Char8</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>BSC</span>
<a name="line-72"></a>
<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'>Char</span> <span class='hs-layout'>(</span> <span class='hs-varid'>toUpper</span><span class='hs-layout'>,</span> <span class='hs-varid'>toLower</span><span class='hs-layout'>,</span> <span class='hs-varid'>isSpace</span> <span class='hs-layout'>)</span>
<a name="line-74"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span> <span class='hs-varid'>group</span><span class='hs-layout'>,</span> <span class='hs-varid'>sort</span> <span class='hs-layout'>)</span>
<a name="line-75"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span> <span class='hs-varid'>isJust</span> <span class='hs-layout'>)</span>
<a name="line-76"></a>
<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'>String</span> <span class='hs-layout'>(</span> <span class='hs-conid'>CString</span><span class='hs-layout'>,</span> <span class='hs-varid'>withCString</span><span class='hs-layout'>,</span> <span class='hs-varid'>peekCString</span> <span class='hs-layout'>)</span>
<a name="line-78"></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> <span class='hs-layout'>(</span> <span class='hs-varid'>throwErrno</span> <span class='hs-layout'>)</span>
<a name="line-79"></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'>Types</span> <span class='hs-layout'>(</span> <span class='hs-conid'>CInt</span> <span class='hs-layout'>)</span>
<a name="line-80"></a>
<a name="line-81"></a><span class='hs-cpp'>#ifdef FORCE_CHAR8_ENCODING</span>
<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'>Encoding</span> <span class='hs-layout'>(</span> <span class='hs-varid'>setFileSystemEncoding</span><span class='hs-layout'>,</span> <span class='hs-varid'>setForeignEncoding</span><span class='hs-layout'>,</span> <span class='hs-varid'>char8</span> <span class='hs-layout'>)</span>
<a name="line-83"></a><span class='hs-cpp'>#endif</span>
<a name="line-84"></a>
<a name="line-85"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Storage</span><span class='hs-varop'>.</span><span class='hs-conid'>Hashed</span><span class='hs-varop'>.</span><span class='hs-conid'>AnchoredPath</span><span class='hs-layout'>(</span> <span class='hs-conid'>AnchoredPath</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Name</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>isPrefix</span><span class='hs-layout'>,</span> <span class='hs-varid'>floatPath</span> <span class='hs-layout'>)</span>
<a name="line-86"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Storage</span><span class='hs-varop'>.</span><span class='hs-conid'>Hashed</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-layout'>(</span> <span class='hs-varid'>withDirectory</span><span class='hs-layout'>,</span> <span class='hs-varid'>fileExists</span><span class='hs-layout'>,</span> <span class='hs-varid'>directoryExists</span>
<a name="line-87"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>virtualTreeMonad</span><span class='hs-layout'>,</span> <span class='hs-varid'>currentDirectory</span>
<a name="line-88"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>TreeMonad</span> <span class='hs-layout'>)</span>
<a name="line-89"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Storage</span><span class='hs-varop'>.</span><span class='hs-conid'>Hashed</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>HS</span> <span class='hs-layout'>(</span> <span class='hs-varid'>exists</span><span class='hs-layout'>,</span> <span class='hs-varid'>tree</span> <span class='hs-layout'>)</span>
<a name="line-90"></a>
<a name="line-91"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Storage</span><span class='hs-varop'>.</span><span class='hs-conid'>Hashed</span><span class='hs-varop'>.</span><span class='hs-conid'>Tree</span><span class='hs-layout'>(</span> <span class='hs-conid'>Tree</span><span class='hs-layout'>,</span> <span class='hs-varid'>listImmediate</span><span class='hs-layout'>,</span> <span class='hs-varid'>findTree</span> <span class='hs-layout'>)</span>
<a name="line-92"></a>
<a name="line-93"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Console</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskeline</span> <span class='hs-layout'>(</span> <span class='hs-varid'>runInputT</span><span class='hs-layout'>,</span> <span class='hs-varid'>defaultSettings</span><span class='hs-layout'>,</span> <span class='hs-varid'>getInputLine</span><span class='hs-layout'>,</span>
<a name="line-94"></a> <span class='hs-varid'>getInputChar</span><span class='hs-layout'>,</span> <span class='hs-varid'>outputStr</span><span class='hs-layout'>,</span> <span class='hs-varid'>outputStrLn</span> <span class='hs-layout'>)</span>
<a name="line-95"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Directory</span> <span class='hs-layout'>(</span> <span class='hs-varid'>doesFileExist</span> <span class='hs-layout'>)</span>
<a name="line-96"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Environment</span> <span class='hs-layout'>(</span> <span class='hs-varid'>getEnv</span> <span class='hs-layout'>)</span>
<a name="line-97"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Exit</span> <span class='hs-layout'>(</span> <span class='hs-conid'>ExitCode</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-98"></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> <span class='hs-layout'>(</span> <span class='hs-varid'>annotateIOError</span><span class='hs-layout'>,</span> <span class='hs-varid'>isUserError</span><span class='hs-layout'>,</span> <span class='hs-varid'>ioeGetErrorString</span>
<a name="line-99"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isDoesNotExistError</span><span class='hs-layout'>,</span> <span class='hs-varid'>ioeGetFileName</span> <span class='hs-layout'>)</span>
<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-layout'>(</span> <span class='hs-varid'>getSymbolicLinkStatus</span><span class='hs-layout'>,</span> <span class='hs-conid'>FileStatus</span> <span class='hs-layout'>)</span>
<a name="line-101"></a>
<a name="line-102"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Regex</span>
<a name="line-103"></a>
<a name="line-104"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>RepoPath</span> <span class='hs-layout'>(</span> <span class='hs-conid'>FilePathLike</span><span class='hs-layout'>,</span> <span class='hs-varid'>getCurrentDirectory</span><span class='hs-layout'>,</span> <span class='hs-varid'>setCurrentDirectory</span><span class='hs-layout'>,</span> <span class='hs-varid'>toFilePath</span> <span class='hs-layout'>)</span>
<a name="line-105"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>SignalHandler</span> <span class='hs-layout'>(</span> <span class='hs-varid'>catchNonSignal</span> <span class='hs-layout'>)</span>
<a name="line-106"></a>
<a name="line-107"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Exec</span> <span class='hs-layout'>(</span> <span class='hs-varid'>execInteractive</span> <span class='hs-layout'>)</span>
<a name="line-108"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Numeric</span> <span class='hs-layout'>(</span> <span class='hs-varid'>showHex</span> <span class='hs-layout'>)</span>
<a name="line-109"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Progress</span> <span class='hs-layout'>(</span> <span class='hs-varid'>withoutProgress</span> <span class='hs-layout'>)</span>
<a name="line-110"></a>
<a name="line-111"></a>
<a name="line-112"></a><a name="showHexLen"></a><span class='hs-definition'>showHexLen</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-113"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Int</span>
<a name="line-114"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-115"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-116"></a><span class='hs-definition'>showHexLen</span> <span class='hs-varid'>n</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showHex</span> <span class='hs-varid'>x</span> <span class='hs-str'>""</span>
<a name="line-117"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>replicate</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-varid'>length</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-chr'>' '</span> <span class='hs-varop'>++</span> <span class='hs-varid'>s</span>
<a name="line-118"></a>
<a name="line-119"></a>
<a name="line-120"></a><a name="addToErrorLoc"></a><span class='hs-definition'>addToErrorLoc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IOException</span>
<a name="line-121"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-122"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IOException</span>
<a name="line-123"></a><span class='hs-definition'>addToErrorLoc</span> <span class='hs-varid'>ioe</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>annotateIOError</span> <span class='hs-varid'>ioe</span> <span class='hs-varid'>s</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span>
<a name="line-124"></a>
<a name="line-125"></a>
<a name="line-126"></a><a name="catchall"></a><span class='hs-definition'>catchall</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-127"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-128"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-129"></a><a name="catchall"></a><span class='hs-definition'>a</span> <span class='hs-varop'>`catchall`</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`catchNonSignal`</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'>b</span><span class='hs-layout'>)</span>
<a name="line-130"></a>
<a name="line-131"></a>
<a name="line-132"></a><a name="maybeGetEnv"></a><span class='hs-definition'>maybeGetEnv</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-133"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span>
<a name="line-134"></a><span class='hs-definition'>maybeGetEnv</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>getEnv</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varop'>`catchall`</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span> <span class='hs-comment'>-- err can only be isDoesNotExist</span>
<a name="line-135"></a>
<a name="line-136"></a>
<a name="line-137"></a><a name="firstJustM"></a><span class='hs-comment'>-- | The firstJustM returns the first Just entry in a list of monadic</span>
<a name="line-138"></a><span class='hs-comment'>-- operations. This is close to `listToMaybe `fmap` sequence`, but the sequence</span>
<a name="line-139"></a><span class='hs-comment'>-- operator evaluates all monadic members of the list before passing it along</span>
<a name="line-140"></a><span class='hs-comment'>-- (i.e. sequence is strict). The firstJustM is lazy in that list member monads</span>
<a name="line-141"></a><span class='hs-comment'>-- are only evaluated up to the point where the first Just entry is obtained.</span>
<a name="line-142"></a><span class='hs-definition'>firstJustM</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-143"></a> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-144"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-145"></a><span class='hs-definition'>firstJustM</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-146"></a><span class='hs-definition'>firstJustM</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span><span class='hs-conop'>:</span><span class='hs-varid'>es</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>e</span> <span class='hs-varop'>>>=</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>if</span> <span class='hs-varid'>isJust</span> <span class='hs-varid'>v</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varid'>v</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>firstJustM</span> <span class='hs-varid'>es</span><span class='hs-layout'>)</span>
<a name="line-147"></a>
<a name="line-148"></a>
<a name="line-149"></a><a name="firstJustIO"></a><span class='hs-comment'>-- | The firstJustIO is a slight modification to firstJustM: the entries in the</span>
<a name="line-150"></a><span class='hs-comment'>-- list must be IO monad operations and the firstJustIO will silently turn any</span>
<a name="line-151"></a><span class='hs-comment'>-- monad call that throws an exception into Nothing, basically causing it to be</span>
<a name="line-152"></a><span class='hs-comment'>-- ignored.</span>
<a name="line-153"></a><span class='hs-definition'>firstJustIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-154"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-155"></a><span class='hs-definition'>firstJustIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>firstJustM</span> <span class='hs-varop'>.</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varop'>`catchall`</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-156"></a>
<a name="line-157"></a>
<a name="line-158"></a><a name="clarifyErrors"></a><span class='hs-definition'>clarifyErrors</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-159"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-160"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-161"></a><span class='hs-definition'>clarifyErrors</span> <span class='hs-varid'>a</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`catch`</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'>fail</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unlines</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>prettyException</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>e</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-162"></a>
<a name="line-163"></a>
<a name="line-164"></a><a name="prettyException"></a><span class='hs-definition'>prettyException</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SomeException</span>
<a name="line-165"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-166"></a><span class='hs-definition'>prettyException</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>ioe</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromException</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>isUserError</span> <span class='hs-varid'>ioe</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ioeGetErrorString</span> <span class='hs-varid'>ioe</span>
<a name="line-167"></a><span class='hs-definition'>prettyException</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>ioe</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromException</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>isDoesNotExistError</span> <span class='hs-varid'>ioe</span> <span class='hs-keyglyph'>=</span>
<a name="line-168"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>ioeGetFileName</span> <span class='hs-varid'>ioe</span> <span class='hs-keyword'>of</span>
<a name="line-169"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varop'>++</span> <span class='hs-str'>" does not exist"</span>
<a name="line-170"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>show</span> <span class='hs-varid'>e</span>
<a name="line-171"></a><span class='hs-definition'>prettyException</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>show</span> <span class='hs-varid'>e</span>
<a name="line-172"></a>
<a name="line-173"></a>
<a name="line-174"></a><a name="prettyError"></a><span class='hs-definition'>prettyError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IOError</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-175"></a><span class='hs-definition'>prettyError</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isUserError</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ioeGetErrorString</span> <span class='hs-varid'>e</span>
<a name="line-176"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>show</span> <span class='hs-varid'>e</span>
<a name="line-177"></a>
<a name="line-178"></a>
<a name="line-179"></a><a name="ortryrunning"></a><span class='hs-comment'>-- | Given two shell commands as arguments, execute the former. The</span>
<a name="line-180"></a><span class='hs-comment'>-- latter is then executed if the former failed because the executable</span>
<a name="line-181"></a><span class='hs-comment'>-- wasn't found (code 127), wasn't executable (code 126) or some other</span>
<a name="line-182"></a><span class='hs-comment'>-- exception occurred. Other failures (such as the user holding ^C)</span>
<a name="line-183"></a><span class='hs-comment'>-- do not cause the second command to be tried.</span>
<a name="line-184"></a><span class='hs-definition'>ortryrunning</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>ExitCode</span>
<a name="line-185"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>ExitCode</span>
<a name="line-186"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>ExitCode</span>
<a name="line-187"></a><a name="ortryrunning"></a><span class='hs-definition'>a</span> <span class='hs-varop'>`ortryrunning`</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-188"></a> <span class='hs-varid'>ret</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>try</span> <span class='hs-varid'>a</span>
<a name="line-189"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>ret</span> <span class='hs-keyword'>of</span>
<a name="line-190"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExitFailure</span> <span class='hs-num'>126</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-comment'>-- command not executable</span>
<a name="line-191"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExitFailure</span> <span class='hs-num'>127</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-comment'>-- command not found</span>
<a name="line-192"></a><span class='hs-cpp'>#ifdef WIN32</span>
<a name="line-193"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExitFailure</span> <span class='hs-num'>9009</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-comment'>-- command not found by cmd.exe on Windows</span>
<a name="line-194"></a><span class='hs-cpp'>#endif</span>
<a name="line-195"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span> <span class='hs-comment'>-- legitimate success/failure</span>
<a name="line-196"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SomeException</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-comment'>-- an exception</span>
<a name="line-197"></a>
<a name="line-198"></a>
<a name="line-199"></a><a name="withCurrentDirectory"></a><span class='hs-definition'>withCurrentDirectory</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePathLike</span> <span class='hs-varid'>p</span>
<a name="line-200"></a> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>p</span>
<a name="line-201"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-202"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-203"></a><span class='hs-definition'>withCurrentDirectory</span> <span class='hs-varid'>name</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-204"></a> <span class='hs-varid'>bracket</span>
<a name="line-205"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span> <span class='hs-varid'>cwd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getCurrentDirectory</span>
<a name="line-206"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>toFilePath</span> <span class='hs-varid'>name</span> <span class='hs-varop'>/=</span> <span class='hs-str'>""</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>setCurrentDirectory</span> <span class='hs-varid'>name</span><span class='hs-layout'>)</span>
<a name="line-207"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>cwd</span><span class='hs-layout'>)</span>
<a name="line-208"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>oldwd</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>setCurrentDirectory</span> <span class='hs-varid'>oldwd</span> <span class='hs-varop'>`catchall`</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-209"></a> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-210"></a>
<a name="line-211"></a>
<a name="line-212"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"umask.h set_umask"</span> <span class='hs-varid'>set_umask</span>
<a name="line-213"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CString</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>CInt</span>
<a name="line-214"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"umask.h reset_umask"</span> <span class='hs-varid'>reset_umask</span>
<a name="line-215"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>CInt</span>
<a name="line-216"></a>
<a name="line-217"></a>
<a name="line-218"></a><a name="withUMask"></a><span class='hs-definition'>withUMask</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-219"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-220"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-221"></a><span class='hs-definition'>withUMask</span> <span class='hs-varid'>umask</span> <span class='hs-varid'>job</span> <span class='hs-keyglyph'>=</span>
<a name="line-222"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>rc</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>withCString</span> <span class='hs-varid'>umask</span> <span class='hs-varid'>set_umask</span>
<a name="line-223"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>rc</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>throwErrno</span> <span class='hs-str'>"Couldn't set umask"</span><span class='hs-layout'>)</span>
<a name="line-224"></a> <span class='hs-varid'>bracket_</span>
<a name="line-225"></a> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-226"></a> <span class='hs-layout'>(</span><span class='hs-varid'>reset_umask</span> <span class='hs-varid'>rc</span><span class='hs-layout'>)</span>
<a name="line-227"></a> <span class='hs-varid'>job</span>
<a name="line-228"></a>
<a name="line-229"></a>
<a name="line-230"></a><a name="askUser"></a><span class='hs-comment'>-- | Ask the user for a line of input.</span>
<a name="line-231"></a><span class='hs-definition'>askUser</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The prompt to display</span>
<a name="line-232"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The string the user entered.</span>
<a name="line-233"></a><span class='hs-definition'>askUser</span> <span class='hs-varid'>prompt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withoutProgress</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runInputT</span> <span class='hs-varid'>defaultSettings</span> <span class='hs-varop'>$</span>
<a name="line-234"></a> <span class='hs-varid'>getInputLine</span> <span class='hs-varid'>prompt</span>
<a name="line-235"></a> <span class='hs-varop'>>>=</span> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>error</span> <span class='hs-str'>"askUser: unexpected end of input"</span><span class='hs-layout'>)</span> <span class='hs-varid'>return</span>
<a name="line-236"></a>
<a name="line-237"></a><a name="askEnter"></a><span class='hs-comment'>-- | Ask the user to press Enter</span>
<a name="line-238"></a><span class='hs-definition'>askEnter</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The prompt to display</span>
<a name="line-239"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-240"></a><span class='hs-definition'>askEnter</span> <span class='hs-varid'>prompt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>askUser</span> <span class='hs-varid'>prompt</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-241"></a>
<a name="line-242"></a><a name="askUserListItem"></a><span class='hs-comment'>-- | @askUserListItem prompt xs@ enumerates @xs@ on the screen, allowing</span>
<a name="line-243"></a><span class='hs-comment'>-- the user to choose one of the items</span>
<a name="line-244"></a><span class='hs-definition'>askUserListItem</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-245"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-246"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-247"></a><span class='hs-definition'>askUserListItem</span> <span class='hs-varid'>prompt</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withoutProgress</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runInputT</span> <span class='hs-varid'>defaultSettings</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-248"></a> <span class='hs-varid'>outputStr</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unlines</span> <span class='hs-varop'>$</span> <span class='hs-varid'>zipWith</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>n</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>show</span> <span class='hs-varid'>n</span> <span class='hs-varop'>++</span> <span class='hs-str'>". "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>1</span><span class='hs-keyglyph'>::</span><span class='hs-conid'>Int</span> <span class='hs-keyglyph'>..</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>xs</span>
<a name="line-249"></a> <span class='hs-varid'>loop</span>
<a name="line-250"></a> <span class='hs-keyword'>where</span>
<a name="line-251"></a> <span class='hs-varid'>loop</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-252"></a> <span class='hs-varid'>answer</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInputLine</span> <span class='hs-varid'>prompt</span>
<a name="line-253"></a> <span class='hs-varop'>>>=</span> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>error</span> <span class='hs-str'>"askUser: unexpected end of input"</span><span class='hs-layout'>)</span> <span class='hs-varid'>return</span>
<a name="line-254"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>maybeRead</span> <span class='hs-varid'>answer</span> <span class='hs-keyword'>of</span>
<a name="line-255"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>></span> <span class='hs-num'>0</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>xs</span> <span class='hs-varop'>!!</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-256"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>outputStrLn</span> <span class='hs-str'>"Invalid response, try again!"</span> <span class='hs-varop'>>></span> <span class='hs-varid'>loop</span>
<a name="line-257"></a>
<a name="line-258"></a>
<a name="line-259"></a><a name="maybeRead"></a><span class='hs-definition'>maybeRead</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Read</span> <span class='hs-varid'>a</span>
<a name="line-260"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>String</span>
<a name="line-261"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span>
<a name="line-262"></a><span class='hs-definition'>maybeRead</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reads</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-263"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>all</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span>
<a name="line-264"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-265"></a>
<a name="line-266"></a>
<a name="line-267"></a><a name="stripCr"></a><span class='hs-definition'>stripCr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-268"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-269"></a><span class='hs-definition'>stripCr</span> <span class='hs-str'>""</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
<a name="line-270"></a><span class='hs-definition'>stripCr</span> <span class='hs-str'>"\r"</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
<a name="line-271"></a><span class='hs-definition'>stripCr</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span> <span class='hs-conop'>:</span> <span class='hs-varid'>stripCr</span> <span class='hs-varid'>cs</span>
<a name="line-272"></a>
<a name="line-273"></a>
<a name="line-274"></a><a name="formatPath"></a><span class='hs-comment'>-- | Format a path for screen output, so that the user sees where the path</span>
<a name="line-275"></a><span class='hs-comment'>-- begins and ends. Could (should?) also warn about unprintable characters here.</span>
<a name="line-276"></a><span class='hs-definition'>formatPath</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-277"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-278"></a><span class='hs-definition'>formatPath</span> <span class='hs-varid'>path</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"\""</span> <span class='hs-varop'>++</span> <span class='hs-varid'>quote</span> <span class='hs-varid'>path</span> <span class='hs-varop'>++</span> <span class='hs-str'>"\""</span>
<a name="line-279"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>quote</span> <span class='hs-str'>""</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
<a name="line-280"></a> <span class='hs-varid'>quote</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>c</span> <span class='hs-varop'>`elem`</span> <span class='hs-keyglyph'>[</span><span class='hs-chr'>'\\'</span><span class='hs-layout'>,</span> <span class='hs-chr'>'"'</span><span class='hs-keyglyph'>]</span>
<a name="line-281"></a> <span class='hs-keyword'>then</span> <span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>quote</span> <span class='hs-varid'>cs</span>
<a name="line-282"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>quote</span> <span class='hs-varid'>cs</span>
<a name="line-283"></a>
<a name="line-284"></a>
<a name="line-285"></a><a name="breakCommand"></a><span class='hs-definition'>breakCommand</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-286"></a><span class='hs-definition'>breakCommand</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>words</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-287"></a> <span class='hs-layout'>(</span><span class='hs-varid'>arg0</span><span class='hs-conop'>:</span><span class='hs-varid'>args</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>arg0</span><span class='hs-layout'>,</span><span class='hs-varid'>args</span><span class='hs-layout'>)</span>
<a name="line-288"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-289"></a>
<a name="line-290"></a>
<a name="line-291"></a><a name="nubsort"></a><span class='hs-definition'>nubsort</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>a</span>
<a name="line-292"></a> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-293"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-294"></a><span class='hs-definition'>nubsort</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>head</span> <span class='hs-varop'>.</span> <span class='hs-varid'>group</span> <span class='hs-varop'>.</span> <span class='hs-varid'>sort</span>
<a name="line-295"></a>
<a name="line-296"></a>
<a name="line-297"></a><a name="editFile"></a><span class='hs-comment'>-- | @editFile f@ lets the user edit a file which could but does not need to</span>
<a name="line-298"></a><span class='hs-comment'>-- already exist. This function returns the exit code from the text editor and a</span>
<a name="line-299"></a><span class='hs-comment'>-- flag indicating if the user made any changes.</span>
<a name="line-300"></a><span class='hs-definition'>editFile</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePathLike</span> <span class='hs-varid'>p</span>
<a name="line-301"></a> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>p</span>
<a name="line-302"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExitCode</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span>
<a name="line-303"></a><span class='hs-definition'>editFile</span> <span class='hs-varid'>ff</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-304"></a> <span class='hs-varid'>old_content</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>file_content</span>
<a name="line-305"></a> <span class='hs-varid'>ec</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runEditor</span> <span class='hs-varid'>f</span>
<a name="line-306"></a> <span class='hs-varid'>new_content</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>file_content</span>
<a name="line-307"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>ec</span><span class='hs-layout'>,</span> <span class='hs-varid'>new_content</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>old_content</span><span class='hs-layout'>)</span>
<a name="line-308"></a> <span class='hs-keyword'>where</span>
<a name="line-309"></a> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toFilePath</span> <span class='hs-varid'>ff</span>
<a name="line-310"></a> <span class='hs-varid'>file_content</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-311"></a> <span class='hs-varid'>exists</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>doesFileExist</span> <span class='hs-varid'>f</span>
<a name="line-312"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>exists</span> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>content</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>readFile</span> <span class='hs-varid'>f</span>
<a name="line-313"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>content</span>
<a name="line-314"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-315"></a>
<a name="line-316"></a>
<a name="line-317"></a><a name="runEditor"></a><span class='hs-definition'>runEditor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePath</span>
<a name="line-318"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>ExitCode</span>
<a name="line-319"></a><span class='hs-definition'>runEditor</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-320"></a> <span class='hs-varid'>ed</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getEditor</span>
<a name="line-321"></a> <span class='hs-varid'>execInteractive</span> <span class='hs-varid'>ed</span> <span class='hs-varid'>f</span>
<a name="line-322"></a> <span class='hs-varop'>`ortryrunning`</span> <span class='hs-varid'>execInteractive</span> <span class='hs-str'>"emacs"</span> <span class='hs-varid'>f</span>
<a name="line-323"></a> <span class='hs-varop'>`ortryrunning`</span> <span class='hs-varid'>execInteractive</span> <span class='hs-str'>"emacs -nw"</span> <span class='hs-varid'>f</span>
<a name="line-324"></a> <span class='hs-varop'>`ortryrunning`</span> <span class='hs-varid'>execInteractive</span> <span class='hs-str'>"nano"</span> <span class='hs-varid'>f</span>
<a name="line-325"></a><span class='hs-cpp'>#ifdef WIN32</span>
<a name="line-326"></a> <span class='hs-varop'>`ortryrunning`</span> <span class='hs-varid'>execInteractive</span> <span class='hs-str'>"edit"</span> <span class='hs-varid'>f</span>
<a name="line-327"></a><span class='hs-cpp'>#endif</span>
<a name="line-328"></a>
<a name="line-329"></a>
<a name="line-330"></a><a name="getEditor"></a><span class='hs-definition'>getEditor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-331"></a><span class='hs-definition'>getEditor</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getEnv</span> <span class='hs-str'>"DARCS_EDITOR"</span> <span class='hs-varop'>`catchall`</span>
<a name="line-332"></a> <span class='hs-varid'>getEnv</span> <span class='hs-str'>"DARCSEDITOR"</span> <span class='hs-varop'>`catchall`</span>
<a name="line-333"></a> <span class='hs-varid'>getEnv</span> <span class='hs-str'>"VISUAL"</span> <span class='hs-varop'>`catchall`</span>
<a name="line-334"></a> <span class='hs-varid'>getEnv</span> <span class='hs-str'>"EDITOR"</span> <span class='hs-varop'>`catchall`</span> <span class='hs-varid'>return</span> <span class='hs-str'>"vi"</span>
<a name="line-335"></a>
<a name="line-336"></a>
<a name="line-337"></a><a name="environmentHelpEditor"></a><span class='hs-definition'>environmentHelpEditor</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-338"></a><span class='hs-definition'>environmentHelpEditor</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-str'>"DARCS_EDITOR"</span><span class='hs-layout'>,</span> <span class='hs-str'>"DARCSEDITOR"</span><span class='hs-layout'>,</span> <span class='hs-str'>"VISUAL"</span><span class='hs-layout'>,</span> <span class='hs-str'>"EDITOR"</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span>
<a name="line-339"></a> <span class='hs-str'>"To edit a patch description of email comment, Darcs will invoke an"</span><span class='hs-layout'>,</span>
<a name="line-340"></a> <span class='hs-str'>"external editor. Your preferred editor can be set as any of the"</span><span class='hs-layout'>,</span>
<a name="line-341"></a> <span class='hs-str'>"environment variables $DARCS_EDITOR, $DARCSEDITOR, $VISUAL or $EDITOR."</span><span class='hs-layout'>,</span>
<a name="line-342"></a> <span class='hs-str'>"If none of these are set, vi(1) is used. If vi crashes or is not"</span><span class='hs-layout'>,</span>
<a name="line-343"></a> <span class='hs-str'>"found in your PATH, emacs, emacs -nw, nano and (on Windows) edit are"</span><span class='hs-layout'>,</span>
<a name="line-344"></a> <span class='hs-str'>"each tried in turn."</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-345"></a>
<a name="line-346"></a>
<a name="line-347"></a><a name="getViewer"></a><span class='hs-definition'>getViewer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-348"></a><span class='hs-definition'>getViewer</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getEnv</span> <span class='hs-str'>"DARCS_PAGER"</span> <span class='hs-varop'>`catchall`</span>
<a name="line-349"></a> <span class='hs-varid'>getEnv</span> <span class='hs-str'>"PAGER"</span> <span class='hs-varop'>`catchall`</span> <span class='hs-varid'>return</span> <span class='hs-str'>"less"</span>
<a name="line-350"></a>
<a name="line-351"></a><a name="environmentHelpPager"></a><span class='hs-definition'>environmentHelpPager</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-352"></a><span class='hs-definition'>environmentHelpPager</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-str'>"DARCS_PAGER"</span><span class='hs-layout'>,</span> <span class='hs-str'>"PAGER"</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span>
<a name="line-353"></a> <span class='hs-str'>"Darcs will sometimes invoke a pager if it deems output to be too long"</span><span class='hs-layout'>,</span>
<a name="line-354"></a> <span class='hs-str'>"to fit onscreen. Darcs will use the pager specified by $DARCS_PAGER"</span><span class='hs-layout'>,</span>
<a name="line-355"></a> <span class='hs-str'>"or $PAGER. If neither are set, `less' will be used."</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-356"></a>
<a name="line-357"></a><a name="PromptConfig"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>PromptConfig</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PromptConfig</span> <span class='hs-layout'>{</span> <span class='hs-varid'>pPrompt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-358"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>pBasicCharacters</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span>
<a name="line-359"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>pAdvancedCharacters</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ only shown on help</span>
<a name="line-360"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>pDefault</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Char</span>
<a name="line-361"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>pHelp</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span>
<a name="line-362"></a> <span class='hs-layout'>}</span>
<a name="line-363"></a>
<a name="line-364"></a>
<a name="line-365"></a><a name="promptYorn"></a><span class='hs-comment'>-- | Prompt the user for a yes or no</span>
<a name="line-366"></a><span class='hs-definition'>promptYorn</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
<a name="line-367"></a><span class='hs-definition'>promptYorn</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span> <span class='hs-chr'>'y'</span><span class='hs-layout'>)</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>promptChar</span> <span class='hs-layout'>(</span><span class='hs-conid'>PromptConfig</span> <span class='hs-varid'>p</span> <span class='hs-str'>"yn"</span> <span class='hs-conid'>[]</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-368"></a>
<a name="line-369"></a>
<a name="line-370"></a><a name="promptChar"></a><span class='hs-definition'>promptChar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PromptConfig</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Char</span>
<a name="line-371"></a><span class='hs-definition'>promptChar</span> <span class='hs-layout'>(</span><span class='hs-conid'>PromptConfig</span> <span class='hs-varid'>p</span> <span class='hs-varid'>basic_chs</span> <span class='hs-varid'>adv_chs</span> <span class='hs-varid'>md</span> <span class='hs-varid'>help_chs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-372"></a> <span class='hs-varid'>withoutProgress</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runInputT</span> <span class='hs-varid'>defaultSettings</span> <span class='hs-varid'>loopChar</span>
<a name="line-373"></a> <span class='hs-keyword'>where</span>
<a name="line-374"></a> <span class='hs-varid'>chs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>basic_chs</span> <span class='hs-varop'>++</span> <span class='hs-varid'>adv_chs</span>
<a name="line-375"></a> <span class='hs-varid'>loopChar</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-376"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>chars</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>setDefault</span> <span class='hs-layout'>(</span><span class='hs-varid'>basic_chs</span> <span class='hs-varop'>++</span> <span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>adv_chs</span> <span class='hs-keyword'>then</span> <span class='hs-str'>""</span> <span class='hs-keyword'>else</span> <span class='hs-str'>"..."</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-377"></a> <span class='hs-varid'>prompt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p</span> <span class='hs-varop'>++</span> <span class='hs-str'>" ["</span> <span class='hs-varop'>++</span> <span class='hs-varid'>chars</span> <span class='hs-varop'>++</span> <span class='hs-str'>"]"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>helpStr</span>
<a name="line-378"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInputChar</span> <span class='hs-varid'>prompt</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>error</span> <span class='hs-str'>"promptChar: unexpected end of input"</span><span class='hs-layout'>)</span>
<a name="line-379"></a> <span class='hs-varid'>return</span>
<a name="line-380"></a> <span class='hs-keyword'>case</span> <span class='hs-conid'>()</span> <span class='hs-keyword'>of</span>
<a name="line-381"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>chs</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>a</span>
<a name="line-382"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>a</span> <span class='hs-varop'>==</span> <span class='hs-chr'>' '</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>tryAgain</span> <span class='hs-varid'>return</span> <span class='hs-varid'>md</span>
<a name="line-383"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>help_chs</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>a</span>
<a name="line-384"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>tryAgain</span>
<a name="line-385"></a> <span class='hs-varid'>helpStr</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>help_chs</span> <span class='hs-keyword'>of</span>
<a name="line-386"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-str'>""</span>
<a name="line-387"></a> <span class='hs-layout'>(</span><span class='hs-varid'>h</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>adv_chs</span> <span class='hs-keyglyph'>-></span> <span class='hs-str'>", or "</span> <span class='hs-varop'>++</span> <span class='hs-layout'>(</span><span class='hs-varid'>h</span><span class='hs-conop'>:</span><span class='hs-str'>" for help: "</span><span class='hs-layout'>)</span>
<a name="line-388"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-str'>", or "</span> <span class='hs-varop'>++</span> <span class='hs-layout'>(</span><span class='hs-varid'>h</span><span class='hs-conop'>:</span><span class='hs-str'>" for more options: "</span><span class='hs-layout'>)</span>
<a name="line-389"></a> <span class='hs-varid'>tryAgain</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>outputStrLn</span> <span class='hs-str'>"Invalid response, try again!"</span>
<a name="line-390"></a> <span class='hs-varid'>loopChar</span>
<a name="line-391"></a> <span class='hs-varid'>setDefault</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>md</span> <span class='hs-keyword'>of</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span>
<a name="line-392"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>setUpper</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-393"></a> <span class='hs-varid'>setUpper</span> <span class='hs-varid'>d</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>d</span> <span class='hs-varop'>==</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>toUpper</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>c</span>
<a name="line-394"></a>
<a name="line-395"></a>
<a name="line-396"></a><a name="filterPaths"></a><span class='hs-comment'>-- | Construct a filter from a list of AnchoredPaths, that will accept any path</span>
<a name="line-397"></a><span class='hs-comment'>-- that is either a parent or a child of any of the listed paths, and discard</span>
<a name="line-398"></a><span class='hs-comment'>-- everything else.</span>
<a name="line-399"></a><span class='hs-definition'>filterPaths</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>AnchoredPath</span><span class='hs-keyglyph'>]</span>
<a name="line-400"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>AnchoredPath</span>
<a name="line-401"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span>
<a name="line-402"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-403"></a><span class='hs-definition'>filterPaths</span> <span class='hs-varid'>files</span> <span class='hs-varid'>p</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>any</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'>x</span> <span class='hs-varop'>`isPrefix`</span> <span class='hs-varid'>p</span> <span class='hs-varop'>||</span> <span class='hs-varid'>p</span> <span class='hs-varop'>`isPrefix`</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>files</span>
<a name="line-404"></a>
<a name="line-405"></a>
<a name="line-406"></a><a name="filterFilePaths"></a><span class='hs-comment'>-- | Same as 'filterPath', but for ordinary 'FilePath's (as opposed to</span>
<a name="line-407"></a><span class='hs-comment'>-- AnchoredPath).</span>
<a name="line-408"></a><span class='hs-definition'>filterFilePaths</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>FilePath</span><span class='hs-keyglyph'>]</span>
<a name="line-409"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>AnchoredPath</span>
<a name="line-410"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span>
<a name="line-411"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-412"></a><span class='hs-definition'>filterFilePaths</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filterPaths</span> <span class='hs-varop'>.</span> <span class='hs-varid'>map</span> <span class='hs-varid'>floatPath</span>
<a name="line-413"></a>
<a name="line-414"></a>
<a name="line-415"></a><a name="getFileStatus"></a><span class='hs-definition'>getFileStatus</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePath</span>
<a name="line-416"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>FileStatus</span><span class='hs-layout'>)</span>
<a name="line-417"></a><span class='hs-definition'>getFileStatus</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span>
<a name="line-418"></a> <span class='hs-conid'>Just</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>getSymbolicLinkStatus</span> <span class='hs-varid'>f</span> <span class='hs-varop'>`catchall`</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-419"></a>
<a name="line-420"></a>
<a name="line-421"></a><a name="treeHasAnycase"></a><span class='hs-definition'>treeHasAnycase</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadError</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Functor</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-422"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Tree</span> <span class='hs-varid'>m</span>
<a name="line-423"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePath</span>
<a name="line-424"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>Bool</span>
<a name="line-425"></a><span class='hs-definition'>treeHasAnycase</span> <span class='hs-varid'>tree</span> <span class='hs-varid'>path</span> <span class='hs-keyglyph'>=</span>
<a name="line-426"></a> <span class='hs-varid'>fst</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>virtualTreeMonad</span> <span class='hs-layout'>(</span><span class='hs-varid'>existsAnycase</span> <span class='hs-varop'>$</span> <span class='hs-varid'>floatPath</span> <span class='hs-varid'>path</span><span class='hs-layout'>)</span> <span class='hs-varid'>tree</span>
<a name="line-427"></a>
<a name="line-428"></a>
<a name="line-429"></a><a name="existsAnycase"></a><span class='hs-definition'>existsAnycase</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadError</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Functor</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-430"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>AnchoredPath</span>
<a name="line-431"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TreeMonad</span> <span class='hs-varid'>m</span> <span class='hs-conid'>Bool</span>
<a name="line-432"></a><span class='hs-definition'>existsAnycase</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnchoredPath</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-433"></a><span class='hs-definition'>existsAnycase</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnchoredPath</span> <span class='hs-layout'>(</span><span class='hs-conid'>Name</span> <span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-434"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>wd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>currentDirectory</span>
<a name="line-435"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>tree</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>gets</span> <span class='hs-layout'>(</span><span class='hs-varid'>flip</span> <span class='hs-varid'>findTree</span> <span class='hs-varid'>wd</span> <span class='hs-varop'>.</span> <span class='hs-conid'>HS</span><span class='hs-varop'>.</span><span class='hs-varid'>tree</span><span class='hs-layout'>)</span>
<a name="line-436"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>subs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-conid'>AnchoredPath</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Name</span> <span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-conid'>Name</span> <span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>listImmediate</span> <span class='hs-varid'>tree</span><span class='hs-layout'>,</span>
<a name="line-437"></a> <span class='hs-conid'>BSC</span><span class='hs-varop'>.</span><span class='hs-varid'>map</span> <span class='hs-varid'>toLower</span> <span class='hs-varid'>n</span> <span class='hs-varop'>==</span> <span class='hs-conid'>BSC</span><span class='hs-varop'>.</span><span class='hs-varid'>map</span> <span class='hs-varid'>toLower</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>]</span>
<a name="line-438"></a> <span class='hs-varid'>or</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>forM</span> <span class='hs-varid'>subs</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>path</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-439"></a> <span class='hs-varid'>file</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fileExists</span> <span class='hs-varid'>path</span>
<a name="line-440"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>file</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-441"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>withDirectory</span> <span class='hs-varid'>path</span> <span class='hs-layout'>(</span><span class='hs-varid'>existsAnycase</span> <span class='hs-varop'>$</span> <span class='hs-conid'>AnchoredPath</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-442"></a>
<a name="line-443"></a>
<a name="line-444"></a><a name="treeHas"></a><span class='hs-definition'>treeHas</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadError</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Functor</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Tree</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>Bool</span>
<a name="line-445"></a><span class='hs-definition'>treeHas</span> <span class='hs-varid'>tree</span> <span class='hs-varid'>path</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fst</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>virtualTreeMonad</span> <span class='hs-layout'>(</span><span class='hs-conid'>HS</span><span class='hs-varop'>.</span><span class='hs-varid'>exists</span> <span class='hs-varop'>$</span> <span class='hs-varid'>floatPath</span> <span class='hs-varid'>path</span><span class='hs-layout'>)</span> <span class='hs-varid'>tree</span>
<a name="line-446"></a>
<a name="line-447"></a><a name="treeHasDir"></a><span class='hs-definition'>treeHasDir</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadError</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Functor</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Tree</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>Bool</span>
<a name="line-448"></a><span class='hs-definition'>treeHasDir</span> <span class='hs-varid'>tree</span> <span class='hs-varid'>path</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fst</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>virtualTreeMonad</span> <span class='hs-layout'>(</span><span class='hs-varid'>directoryExists</span> <span class='hs-varop'>$</span> <span class='hs-varid'>floatPath</span> <span class='hs-varid'>path</span><span class='hs-layout'>)</span> <span class='hs-varid'>tree</span>
<a name="line-449"></a>
<a name="line-450"></a><a name="treeHasFile"></a><span class='hs-definition'>treeHasFile</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadError</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Functor</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Tree</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>Bool</span>
<a name="line-451"></a><span class='hs-definition'>treeHasFile</span> <span class='hs-varid'>tree</span> <span class='hs-varid'>path</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fst</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>virtualTreeMonad</span> <span class='hs-layout'>(</span><span class='hs-varid'>fileExists</span> <span class='hs-varop'>$</span> <span class='hs-varid'>floatPath</span> <span class='hs-varid'>path</span><span class='hs-layout'>)</span> <span class='hs-varid'>tree</span>
<a name="line-452"></a>
<a name="line-453"></a><a name="setDarcsEncodings"></a><span class='hs-comment'>-- | In some environments, darcs requires that certain global GHC library variables that</span>
<a name="line-454"></a><span class='hs-comment'>-- control the encoding used in internal translations are set to specific values.</span>
<a name="line-455"></a><span class='hs-comment'>--</span>
<a name="line-456"></a><span class='hs-comment'>-- @setDarcsEncoding@ enforces those settings, and should be called before the</span>
<a name="line-457"></a><span class='hs-comment'>-- first time any darcs operation is run, and again if anything else might have</span>
<a name="line-458"></a><span class='hs-comment'>-- set those encodings to different values.</span>
<a name="line-459"></a><span class='hs-comment'>--</span>
<a name="line-460"></a><span class='hs-comment'>-- Note that it isn't thread-safe and has a global effect on your program.</span>
<a name="line-461"></a><span class='hs-comment'>--</span>
<a name="line-462"></a><span class='hs-comment'>-- The current behaviour of this function is as follows, though this may</span>
<a name="line-463"></a><span class='hs-comment'>-- change in future:</span>
<a name="line-464"></a><span class='hs-comment'>--</span>
<a name="line-465"></a><span class='hs-comment'>-- Encodings are only set on GHC 7.4 and up, on any non-Windows platform.</span>
<a name="line-466"></a><span class='hs-comment'>--</span>
<a name="line-467"></a><span class='hs-comment'>-- Two encodings are set, both to @GHC.IO.Encoding.char8@:</span>
<a name="line-468"></a><span class='hs-comment'>-- @GHC.IO.Encoding.setFileSystemEncoding@ and @GHC.IO.Encoding.setForeignEncoding@.</span>
<a name="line-469"></a><span class='hs-comment'>--</span>
<a name="line-470"></a><span class='hs-definition'>setDarcsEncodings</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-471"></a><span class='hs-definition'>setDarcsEncodings</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-472"></a><span class='hs-cpp'>#ifdef FORCE_CHAR8_ENCODING</span>
<a name="line-473"></a>
<a name="line-474"></a><span class='hs-comment'>-- This is needed for appropriate behaviour from getArgs and from general</span>
<a name="line-475"></a><span class='hs-comment'>-- filesystem calls (e.g. getDirectoryContents, readFile, ...)</span>
<a name="line-476"></a> <span class='hs-varid'>setFileSystemEncoding</span> <span class='hs-varid'>char8</span>
<a name="line-477"></a>
<a name="line-478"></a><span class='hs-comment'>-- This ensures that foreign calls made by hashed-storage to stat</span>
<a name="line-479"></a><span class='hs-comment'>-- filenames returned from getDirectoryContents are translated appropriately</span>
<a name="line-480"></a> <span class='hs-varid'>setForeignEncoding</span> <span class='hs-varid'>char8</span>
<a name="line-481"></a>
<a name="line-482"></a><span class='hs-cpp'>#endif</span>
<a name="line-483"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-484"></a>
<a name="line-485"></a><span class='hs-comment'>-- The following functions are copied from the encoding package (BSD3</span>
<a name="line-486"></a><span class='hs-comment'>-- licence, by Henning Günther).</span>
<a name="line-487"></a>
<a name="line-488"></a><span class='hs-comment'>-- | @getSystemEncoding@ fetches the current encoding from locale</span>
<a name="line-489"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-str'>"system_encoding.h get_system_encoding"</span>
<a name="line-490"></a> <span class='hs-varid'>get_system_encoding</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>CString</span>
<a name="line-491"></a>
<a name="line-492"></a>
<a name="line-493"></a><a name="getSystemEncoding"></a><span class='hs-definition'>getSystemEncoding</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-494"></a><span class='hs-definition'>getSystemEncoding</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-495"></a> <span class='hs-varid'>enc</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>get_system_encoding</span>
<a name="line-496"></a> <span class='hs-varid'>peekCString</span> <span class='hs-varid'>enc</span>
<a name="line-497"></a>
<a name="line-498"></a>
<a name="line-499"></a><a name="isUTF8Locale"></a><span class='hs-comment'>-- | @isUTF8@ checks if an encoding is UTF-8 (or ascii, since it is a</span>
<a name="line-500"></a><span class='hs-comment'>-- subset of UTF-8).</span>
<a name="line-501"></a><span class='hs-definition'>isUTF8Locale</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-502"></a><span class='hs-definition'>isUTF8Locale</span> <span class='hs-varid'>codeName</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>normalizeEncoding</span> <span class='hs-varid'>codeName</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-503"></a> <span class='hs-comment'>-- ASCII</span>
<a name="line-504"></a> <span class='hs-str'>"ascii"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-505"></a> <span class='hs-str'>"646"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-506"></a> <span class='hs-str'>"ansi_x3_4_1968"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-507"></a> <span class='hs-str'>"ansi_x3.4_1986"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-508"></a> <span class='hs-str'>"cp367"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-509"></a> <span class='hs-str'>"csascii"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-510"></a> <span class='hs-str'>"ibm367"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-511"></a> <span class='hs-str'>"iso646_us"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-512"></a> <span class='hs-str'>"iso_646.irv_1991"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-513"></a> <span class='hs-str'>"iso_ir_6"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-514"></a> <span class='hs-str'>"us"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-515"></a> <span class='hs-str'>"us_ascii"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-516"></a> <span class='hs-comment'>-- UTF-8</span>
<a name="line-517"></a> <span class='hs-str'>"utf_8"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-518"></a> <span class='hs-str'>"u8"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-519"></a> <span class='hs-str'>"utf"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-520"></a> <span class='hs-str'>"utf8"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-521"></a> <span class='hs-str'>"utf8_ucs2"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-522"></a> <span class='hs-str'>"utf8_ucs4"</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-523"></a> <span class='hs-comment'>-- Everything else</span>
<a name="line-524"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-525"></a> <span class='hs-keyword'>where</span>
<a name="line-526"></a> <span class='hs-varid'>normalizeEncoding</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>toLower</span> <span class='hs-varop'>$</span> <span class='hs-varid'>subRegex</span> <span class='hs-varid'>sep</span> <span class='hs-varid'>s</span> <span class='hs-str'>"_"</span>
<a name="line-527"></a> <span class='hs-varid'>sep</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkRegex</span> <span class='hs-str'>"[^0-9A-Za-z]+"</span>
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