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<title>src/Darcs/Utils.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- Various utility functions that do not belong anywhere else.</span>
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<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE CPP, ForeignFunctionInterface #-}</span>
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<a name="line-5"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span> <span class='hs-layout'>(</span> <span class='hs-varid'>catchall</span><span class='hs-layout'>,</span> <span class='hs-varid'>ortryrunning</span><span class='hs-layout'>,</span> <span class='hs-varid'>nubsort</span><span class='hs-layout'>,</span> <span class='hs-varid'>breakCommand</span><span class='hs-layout'>,</span>
<a name="line-6"></a> <span class='hs-varid'>clarifyErrors</span><span class='hs-layout'>,</span> <span class='hs-varid'>prettyException</span><span class='hs-layout'>,</span> <span class='hs-varid'>prettyError</span><span class='hs-layout'>,</span>
<a name="line-7"></a> <span class='hs-varid'>putStrLnError</span><span class='hs-layout'>,</span> <span class='hs-varid'>putDocLnError</span><span class='hs-layout'>,</span>
<a name="line-8"></a> <span class='hs-varid'>withCurrentDirectory</span><span class='hs-layout'>,</span>
<a name="line-9"></a> <span class='hs-varid'>withUMask</span><span class='hs-layout'>,</span> <span class='hs-varid'>askUser</span><span class='hs-layout'>,</span> <span class='hs-varid'>stripCr</span><span class='hs-layout'>,</span>
<a name="line-10"></a> <span class='hs-varid'>showHexLen</span><span class='hs-layout'>,</span> <span class='hs-varid'>add_to_error_loc</span><span class='hs-layout'>,</span>
<a name="line-11"></a> <span class='hs-varid'>maybeGetEnv</span><span class='hs-layout'>,</span> <span class='hs-varid'>firstNotBlank</span><span class='hs-layout'>,</span> <span class='hs-varid'>firstJustM</span><span class='hs-layout'>,</span> <span class='hs-varid'>firstJustIO</span><span class='hs-layout'>,</span>
<a name="line-12"></a> <span class='hs-varid'>isUnsupportedOperationError</span><span class='hs-layout'>,</span> <span class='hs-varid'>isHardwareFaultError</span><span class='hs-layout'>,</span>
<a name="line-13"></a> <span class='hs-varid'>get_viewer</span><span class='hs-layout'>,</span> <span class='hs-varid'>edit_file</span><span class='hs-layout'>,</span> <span class='hs-varid'>run_editor</span><span class='hs-layout'>,</span>
<a name="line-14"></a> <span class='hs-varid'>promptYorn</span><span class='hs-layout'>,</span> <span class='hs-varid'>promptCharFancy</span><span class='hs-layout'>,</span>
<a name="line-15"></a> <span class='hs-varid'>environmentHelpEditor</span><span class='hs-layout'>,</span> <span class='hs-varid'>environmentHelpPager</span><span class='hs-layout'>,</span>
<a name="line-16"></a> <span class='hs-varid'>formatPath</span>
<a name="line-17"></a> <span class='hs-comment'>-- * Tree filtering.</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>filterFilePaths</span><span class='hs-layout'>,</span> <span class='hs-varid'>filterPaths</span>
<a name="line-19"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
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<a name="line-21"></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-22"></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-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-conid'>Exception</span><span class='hs-layout'>(</span><span class='hs-conid'>IOException</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>try</span> <span class='hs-layout'>)</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>IOBase</span> <span class='hs-layout'>(</span> <span class='hs-conid'>IOException</span><span class='hs-layout'>(</span><span class='hs-varid'>ioe_location</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-24"></a> <span class='hs-conid'>IOErrorType</span><span class='hs-layout'>(</span><span class='hs-conid'>UnsupportedOperation</span><span class='hs-layout'>,</span> <span class='hs-conid'>HardwareFault</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-25"></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'>isUserError</span><span class='hs-layout'>,</span> <span class='hs-varid'>ioeGetErrorType</span><span class='hs-layout'>,</span> <span class='hs-varid'>ioeGetErrorString</span> <span class='hs-layout'>)</span>
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<a name="line-27"></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-28"></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-29"></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-30"></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-varid'>exitWith</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-31"></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-32"></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-layout'>(</span> <span class='hs-varid'>hPutStrLn</span><span class='hs-layout'>,</span> <span class='hs-varid'>stderr</span> <span class='hs-layout'>)</span>
<a name="line-33"></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>
<a name="line-34"></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-35"></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'>listToMaybe</span><span class='hs-layout'>,</span> <span class='hs-varid'>isJust</span> <span class='hs-layout'>)</span>
<a name="line-36"></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-37"></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>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Exec</span> <span class='hs-layout'>(</span> <span class='hs-varid'>exec_interactive</span> <span class='hs-layout'>)</span>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Printer</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Doc</span><span class='hs-layout'>,</span> <span class='hs-varid'>hPutDocLn</span> <span class='hs-layout'>)</span>
<a name="line-40"></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>
<a name="line-41"></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-42"></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>
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<a name="line-44"></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>
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<a name="line-46"></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-varid'>isPrefix</span><span class='hs-layout'>,</span> <span class='hs-varid'>floatPath</span> <span class='hs-layout'>)</span>
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<a name="line-48"></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-49"></a> <span class='hs-varid'>getInputChar</span><span class='hs-layout'>,</span> <span class='hs-varid'>outputStrLn</span> <span class='hs-layout'>)</span>
<a name="line-50"></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-varop'>.</span><span class='hs-conid'>Encoding</span> <span class='hs-layout'>(</span> <span class='hs-varid'>encode</span> <span class='hs-layout'>)</span>
<a name="line-51"></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-52"></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'>B</span> <span class='hs-layout'>(</span> <span class='hs-varid'>unpack</span> <span class='hs-layout'>)</span>
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<a name="line-54"></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-keyglyph'>=></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-55"></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-56"></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>
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<a name="line-58"></a><a name="add_to_error_loc"></a><span class='hs-definition'>add_to_error_loc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Exception</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Exception</span>
<a name="line-59"></a><span class='hs-definition'>add_to_error_loc</span> <span class='hs-layout'>(</span><span class='hs-conid'>IOException</span> <span class='hs-varid'>ioe</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-60"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IOException</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ioe</span> <span class='hs-layout'>{</span> <span class='hs-varid'>ioe_location</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s</span> <span class='hs-varop'>++</span> <span class='hs-str'>": "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>ioe_location</span> <span class='hs-varid'>ioe</span> <span class='hs-layout'>}</span>
<a name="line-61"></a><span class='hs-definition'>add_to_error_loc</span> <span class='hs-varid'>e</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>e</span>
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<a name="line-63"></a><a name="isUnsupportedOperationError"></a><span class='hs-definition'>isUnsupportedOperationError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IOError</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-64"></a><span class='hs-definition'>isUnsupportedOperationError</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isUnsupportedOperationErrorType</span> <span class='hs-varop'>.</span> <span class='hs-varid'>ioeGetErrorType</span>
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<a name="line-66"></a><a name="isUnsupportedOperationErrorType"></a><span class='hs-definition'>isUnsupportedOperationErrorType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IOErrorType</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-67"></a><span class='hs-definition'>isUnsupportedOperationErrorType</span> <span class='hs-conid'>UnsupportedOperation</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-68"></a><span class='hs-definition'>isUnsupportedOperationErrorType</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
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<a name="line-70"></a><a name="isHardwareFaultError"></a><span class='hs-definition'>isHardwareFaultError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IOError</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-71"></a><span class='hs-definition'>isHardwareFaultError</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isHardwareFaultErrorType</span> <span class='hs-varop'>.</span> <span class='hs-varid'>ioeGetErrorType</span>
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<a name="line-73"></a><a name="isHardwareFaultErrorType"></a><span class='hs-definition'>isHardwareFaultErrorType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IOErrorType</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-74"></a><span class='hs-definition'>isHardwareFaultErrorType</span> <span class='hs-conid'>HardwareFault</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-75"></a><span class='hs-definition'>isHardwareFaultErrorType</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
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<a name="line-77"></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> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-78"></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>
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<a name="line-80"></a><a name="maybeGetEnv"></a><span class='hs-definition'>maybeGetEnv</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</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-conid'>String</span><span class='hs-layout'>)</span>
<a name="line-81"></a><span class='hs-definition'>maybeGetEnv</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>getEnv</span> <span class='hs-varid'>s</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>return</span><span class='hs-varop'>.</span><span class='hs-conid'>Just</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>
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<a name="line-84"></a><a name="firstJustM"></a><span class='hs-comment'>-- |The firstJustM returns the first Just entry in a list of monadic operations. This is close to</span>
<a name="line-85"></a><span class='hs-comment'>-- `listToMaybe `fmap` sequence`, but the sequence operator evaluates all monadic members of the</span>
<a name="line-86"></a><span class='hs-comment'>-- list before passing it along (i.e. sequence is strict). The firstJustM is lazy in that list</span>
<a name="line-87"></a><span class='hs-comment'>-- member monads are only evaluated up to the point where the first Just entry is obtained.</span>
<a name="line-88"></a><span class='hs-definition'>firstJustM</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <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> <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-89"></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-90"></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-91"></a>
<a name="line-92"></a><a name="firstJustIO"></a><span class='hs-comment'>-- |The firstJustIO is a slight modification to firstJustM: the</span>
<a name="line-93"></a><span class='hs-comment'>-- entries in the list must be IO monad operations and the</span>
<a name="line-94"></a><span class='hs-comment'>-- firstJustIO will silently turn any monad call that throws an</span>
<a name="line-95"></a><span class='hs-comment'>-- exception into Nothing, basically causing it to be ignored.</span>
<a name="line-96"></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> <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-97"></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-keyglyph'>\</span><span class='hs-varid'>o</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>o</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-98"></a>
<a name="line-99"></a>
<a name="line-100"></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> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-101"></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-102"></a>
<a name="line-103"></a><a name="prettyException"></a><span class='hs-definition'>prettyException</span> <span class='hs-keyglyph'>::</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'>Exception</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-104"></a><span class='hs-definition'>prettyException</span> <span class='hs-layout'>(</span><span class='hs-conid'>IOException</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</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-105"></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-106"></a>
<a name="line-107"></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-108"></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-109"></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-110"></a>
<a name="line-111"></a><a name="ortryrunning"></a><span class='hs-comment'>-- | Given two shell commands as arguments, execute the former. The</span>
<a name="line-112"></a><span class='hs-comment'>-- latter is then executed if the former failed because the executable</span>
<a name="line-113"></a><span class='hs-comment'>-- wasn't found (code 127), wasn't executable (code 126) or some other</span>
<a name="line-114"></a><span class='hs-comment'>-- exception occurred. Other failures (such as the user holding ^C)</span>
<a name="line-115"></a><span class='hs-comment'>-- do not cause the second command to be tried.</span>
<a name="line-116"></a><span class='hs-definition'>ortryrunning</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>ExitCode</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>ExitCode</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>ExitCode</span>
<a name="line-117"></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-118"></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-119"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>ret</span> <span class='hs-keyword'>of</span>
<a name="line-120"></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-121"></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-122"></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-123"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-keyword'>_</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-124"></a>
<a name="line-125"></a><a name="putStrLnError"></a><span class='hs-definition'>putStrLnError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-126"></a><span class='hs-definition'>putStrLnError</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hPutStrLn</span> <span class='hs-varid'>stderr</span>
<a name="line-127"></a>
<a name="line-128"></a><a name="putDocLnError"></a><span class='hs-definition'>putDocLnError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Doc</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-129"></a><span class='hs-definition'>putDocLnError</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hPutDocLn</span> <span class='hs-varid'>stderr</span>
<a name="line-130"></a>
<a name="line-131"></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> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-132"></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-133"></a> <span class='hs-varid'>bracket</span>
<a name="line-134"></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-135"></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-136"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>cwd</span><span class='hs-layout'>)</span>
<a name="line-137"></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-138"></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-139"></a>
<a name="line-140"></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-141"></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-142"></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-143"></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-144"></a>
<a name="line-145"></a><a name="withUMask"></a><span class='hs-definition'>withUMask</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-146"></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-147"></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-148"></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-149"></a> <span class='hs-varid'>bracket_</span>
<a name="line-150"></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-151"></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-152"></a> <span class='hs-varid'>job</span>
<a name="line-153"></a>
<a name="line-154"></a><a name="askUser"></a><span class='hs-definition'>askUser</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-155"></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-156"></a> <span class='hs-varid'>getInputLine</span> <span class='hs-varid'>prompt</span>
<a name="line-157"></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-158"></a> <span class='hs-comment'>-- Return the input as encoded, 8-bit Chars (same as the</span>
<a name="line-159"></a> <span class='hs-comment'>-- non-Haskeline backend).</span>
<a name="line-160"></a> <span class='hs-varop'>>>=</span> <span class='hs-varid'>fmap</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>unpack</span> <span class='hs-varop'>.</span> <span class='hs-varid'>encode</span>
<a name="line-161"></a>
<a name="line-162"></a><a name="stripCr"></a><span class='hs-definition'>stripCr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-163"></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-164"></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-165"></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-166"></a>
<a name="line-167"></a><a name="firstNotBlank"></a><span class='hs-comment'>-- |Returns Just l where l is first non-blank string in input array; Nothing if no non-blank entries</span>
<a name="line-168"></a><span class='hs-definition'>firstNotBlank</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>String</span>
<a name="line-169"></a><span class='hs-definition'>firstNotBlank</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>listToMaybe</span> <span class='hs-varop'>.</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-varid'>null</span><span class='hs-layout'>)</span>
<a name="line-170"></a>
<a name="line-171"></a>
<a name="line-172"></a><a name="formatPath"></a><span class='hs-comment'>-- Format a path for screen output,</span>
<a name="line-173"></a><span class='hs-comment'>-- so that the user sees where the path begins and ends.</span>
<a name="line-174"></a><span class='hs-comment'>-- Could (should?) also warn about unprintable characters here.</span>
<a name="line-175"></a><span class='hs-definition'>formatPath</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-176"></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-177"></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-178"></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'>==</span><span class='hs-chr'>'\\'</span> <span class='hs-varop'>||</span> <span class='hs-varid'>c</span><span class='hs-varop'>==</span><span class='hs-chr'>'"'</span>
<a name="line-179"></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-180"></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-181"></a>
<a name="line-182"></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-183"></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-184"></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-185"></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-186"></a>
<a name="line-187"></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> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-188"></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-189"></a>
<a name="line-190"></a>
<a name="line-191"></a><a name="edit_file"></a><span class='hs-definition'>edit_file</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePathLike</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>ExitCode</span>
<a name="line-192"></a><span class='hs-definition'>edit_file</span> <span class='hs-varid'>ff</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-193"></a> <span class='hs-varid'>old_content</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>file_content</span>
<a name="line-194"></a> <span class='hs-varid'>ec</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>run_editor</span> <span class='hs-varid'>f</span>
<a name="line-195"></a> <span class='hs-varid'>new_content</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>file_content</span>
<a name="line-196"></a> <span class='hs-varid'>when</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> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-197"></a> <span class='hs-varid'>yorn</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>promptYorn</span> <span class='hs-str'>"File content did not change. Continue anyway?"</span>
<a name="line-198"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>yorn</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'n'</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>putStrLn</span> <span class='hs-str'>"Aborted."</span>
<a name="line-199"></a> <span class='hs-varid'>exitWith</span> <span class='hs-conid'>ExitSuccess</span>
<a name="line-200"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>ec</span>
<a name="line-201"></a> <span class='hs-keyword'>where</span> <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-202"></a> <span class='hs-varid'>file_content</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-203"></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-204"></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-205"></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-206"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-207"></a>
<a name="line-208"></a><a name="run_editor"></a><span class='hs-definition'>run_editor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>ExitCode</span>
<a name="line-209"></a><span class='hs-definition'>run_editor</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-210"></a> <span class='hs-varid'>ed</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>get_editor</span>
<a name="line-211"></a> <span class='hs-varid'>exec_interactive</span> <span class='hs-varid'>ed</span> <span class='hs-varid'>f</span>
<a name="line-212"></a> <span class='hs-varop'>`ortryrunning`</span> <span class='hs-varid'>exec_interactive</span> <span class='hs-str'>"emacs"</span> <span class='hs-varid'>f</span>
<a name="line-213"></a> <span class='hs-varop'>`ortryrunning`</span> <span class='hs-varid'>exec_interactive</span> <span class='hs-str'>"emacs -nw"</span> <span class='hs-varid'>f</span>
<a name="line-214"></a> <span class='hs-varop'>`ortryrunning`</span> <span class='hs-varid'>exec_interactive</span> <span class='hs-str'>"nano"</span> <span class='hs-varid'>f</span>
<a name="line-215"></a><span class='hs-cpp'>#ifdef WIN32</span>
<a name="line-216"></a> <span class='hs-varop'>`ortryrunning`</span> <span class='hs-varid'>exec_interactive</span> <span class='hs-str'>"edit"</span> <span class='hs-varid'>f</span>
<a name="line-217"></a><span class='hs-cpp'>#endif</span>
<a name="line-218"></a>
<a name="line-219"></a><a name="get_editor"></a><span class='hs-definition'>get_editor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-220"></a><span class='hs-definition'>get_editor</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-221"></a> <span class='hs-varid'>getEnv</span> <span class='hs-str'>"DARCSEDITOR"</span> <span class='hs-varop'>`catchall`</span>
<a name="line-222"></a> <span class='hs-varid'>getEnv</span> <span class='hs-str'>"VISUAL"</span> <span class='hs-varop'>`catchall`</span>
<a name="line-223"></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-224"></a>
<a name="line-225"></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-226"></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-227"></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-228"></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-229"></a> <span class='hs-str'>"environment variables $DARCS_EDITOR, $DARCSEDITOR, $VISUAL or $EDITOR."</span><span class='hs-layout'>,</span>
<a name="line-230"></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-231"></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-232"></a> <span class='hs-str'>"each tried in turn."</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-233"></a>
<a name="line-234"></a><a name="get_viewer"></a><span class='hs-definition'>get_viewer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-235"></a><span class='hs-definition'>get_viewer</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-236"></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-237"></a>
<a name="line-238"></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-239"></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-240"></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-241"></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-242"></a> <span class='hs-str'>"or $PAGER. If neither are set, `less' will be used."</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-243"></a>
<a name="line-244"></a><a name="promptYorn"></a><span class='hs-definition'>promptYorn</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Char</span>
<a name="line-245"></a><span class='hs-definition'>promptYorn</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>promptCharFancy</span> <span class='hs-varid'>p</span> <span class='hs-str'>"yn"</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>[]</span>
<a name="line-246"></a>
<a name="line-247"></a><a name="promptCharFancy"></a><span class='hs-definition'>promptCharFancy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Char</span>
<a name="line-248"></a><span class='hs-definition'>promptCharFancy</span> <span class='hs-varid'>p</span> <span class='hs-varid'>chs</span> <span class='hs-varid'>md</span> <span class='hs-varid'>help_chs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withoutProgress</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runInputT</span> <span class='hs-varid'>defaultSettings</span> <span class='hs-varop'>$</span>
<a name="line-249"></a> <span class='hs-varid'>loopChar</span>
<a name="line-250"></a> <span class='hs-keyword'>where</span>
<a name="line-251"></a> <span class='hs-varid'>loopChar</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-252"></a> <span class='hs-keyword'>let</span> <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'>setDefault</span> <span class='hs-varid'>chs</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-253"></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'>"promptCharFancy: unexpected end of input"</span><span class='hs-layout'>)</span>
<a name="line-254"></a> <span class='hs-varid'>return</span>
<a name="line-255"></a> <span class='hs-keyword'>case</span> <span class='hs-conid'>()</span> <span class='hs-keyword'>of</span>
<a name="line-256"></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-257"></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-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'>tryAgain</span>
<a name="line-258"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>d</span>
<a name="line-259"></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-260"></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-261"></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-262"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-str'>""</span>
<a name="line-263"></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-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-264"></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-265"></a> <span class='hs-varid'>loopChar</span>
<a name="line-266"></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-267"></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-268"></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-269"></a>
<a name="line-270"></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-271"></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-272"></a><span class='hs-comment'>-- everything else.</span>
<a name="line-273"></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> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>AnchoredPath</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-274"></a><span class='hs-definition'>filterPaths</span> <span class='hs-varid'>files</span> <span class='hs-keyglyph'>=</span>
<a name="line-275"></a> <span class='hs-keyglyph'>\</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-276"></a>
<a name="line-277"></a><a name="filterFilePaths"></a><span class='hs-comment'>-- | Same as 'filterPath', but for ordinary 'FilePath's (as opposed to</span>
<a name="line-278"></a><span class='hs-comment'>-- AnchoredPath).</span>
<a name="line-279"></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> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>AnchoredPath</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-280"></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-281"></a>
</pre></body>
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