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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Distribution.GetOpt</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Sven Panne 2002-2005</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/base/LICENSE)</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : libraries@haskell.org</span>
<a name="line-8"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-9"></a><span class='hs-comment'>--</span>
<a name="line-10"></a><span class='hs-comment'>-- This library provides facilities for parsing the command-line options</span>
<a name="line-11"></a><span class='hs-comment'>-- in a standalone program. It is essentially a Haskell port of the GNU</span>
<a name="line-12"></a><span class='hs-comment'>-- @getopt@ library.</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-15"></a>
<a name="line-16"></a><span class='hs-comment'>{-
<a name="line-17"></a>Sven Panne <Sven.Panne@informatik.uni-muenchen.de> Oct. 1996 (small
<a name="line-18"></a>changes Dec. 1997)
<a name="line-19"></a>
<a name="line-20"></a>Two rather obscure features are missing: The Bash 2.0 non-option hack
<a name="line-21"></a>(if you don't already know it, you probably don't want to hear about
<a name="line-22"></a>it...) and the recognition of long options with a single dash
<a name="line-23"></a>(e.g. '-help' is recognised as '--help', as long as there is no short
<a name="line-24"></a>option 'h').
<a name="line-25"></a>
<a name="line-26"></a>Other differences between GNU's getopt and this implementation:
<a name="line-27"></a>
<a name="line-28"></a>* To enforce a coherent description of options and arguments, there
<a name="line-29"></a> are explanation fields in the option/argument descriptor.
<a name="line-30"></a>
<a name="line-31"></a>* Error messages are now more informative, but no longer POSIX
<a name="line-32"></a> compliant... :-(
<a name="line-33"></a>
<a name="line-34"></a>And a final Haskell advertisement: The GNU C implementation uses well
<a name="line-35"></a>over 1100 lines, we need only 195 here, including a 46 line example!
<a name="line-36"></a>:-)
<a name="line-37"></a>-}</span>
<a name="line-38"></a>
<a name="line-39"></a><span class='hs-comment'>{-# OPTIONS_HADDOCK hide #-}</span>
<a name="line-40"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Distribution</span><span class='hs-varop'>.</span><span class='hs-conid'>GetOpt</span> <span class='hs-layout'>(</span>
<a name="line-41"></a> <span class='hs-comment'>-- * GetOpt</span>
<a name="line-42"></a> <span class='hs-varid'>getOpt</span><span class='hs-layout'>,</span> <span class='hs-varid'>getOpt'</span><span class='hs-layout'>,</span>
<a name="line-43"></a> <span class='hs-varid'>usageInfo</span><span class='hs-layout'>,</span>
<a name="line-44"></a> <span class='hs-conid'>ArgOrder</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-45"></a> <span class='hs-conid'>OptDescr</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-46"></a> <span class='hs-conid'>ArgDescr</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-47"></a>
<a name="line-48"></a> <span class='hs-comment'>-- * Example</span>
<a name="line-49"></a>
<a name="line-50"></a> <span class='hs-comment'>-- $example</span>
<a name="line-51"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-52"></a>
<a name="line-53"></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'>isPrefixOf</span><span class='hs-layout'>,</span> <span class='hs-varid'>intercalate</span><span class='hs-layout'>,</span> <span class='hs-varid'>find</span> <span class='hs-layout'>)</span>
<a name="line-54"></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-55"></a>
<a name="line-56"></a><a name="ArgOrder"></a><span class='hs-comment'>-- |What to do with options following non-options</span>
<a name="line-57"></a><a name="ArgOrder"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ArgOrder</span> <span class='hs-varid'>a</span>
<a name="line-58"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RequireOrder</span> <span class='hs-comment'>-- ^ no option processing after first non-option</span>
<a name="line-59"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Permute</span> <span class='hs-comment'>-- ^ freely intersperse options and non-options</span>
<a name="line-60"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ReturnInOrder</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ wrap non-options into options</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="OptDescr"></a><span class='hs-comment'>{-|
<a name="line-63"></a>Each 'OptDescr' describes a single option.
<a name="line-64"></a>
<a name="line-65"></a>The arguments to 'Option' are:
<a name="line-66"></a>
<a name="line-67"></a>* list of short option characters
<a name="line-68"></a>
<a name="line-69"></a>* list of long option strings (without \"--\")
<a name="line-70"></a>
<a name="line-71"></a>* argument descriptor
<a name="line-72"></a>
<a name="line-73"></a>* explanation of option for user
<a name="line-74"></a>-}</span>
<a name="line-75"></a><a name="OptDescr"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>OptDescr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>-- description of a single options:</span>
<a name="line-76"></a> <span class='hs-conid'>Option</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- list of short option characters</span>
<a name="line-77"></a> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- list of long option strings (without "--")</span>
<a name="line-78"></a> <span class='hs-layout'>(</span><span class='hs-conid'>ArgDescr</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- argument descriptor</span>
<a name="line-79"></a> <span class='hs-conid'>String</span> <span class='hs-comment'>-- explanation of option for user</span>
<a name="line-80"></a>
<a name="line-81"></a><a name="ArgDescr"></a><span class='hs-comment'>-- |Describes whether an option takes an argument or not, and if so</span>
<a name="line-82"></a><a name="ArgDescr"></a><span class='hs-comment'>-- how the argument is injected into a value of type @a@.</span>
<a name="line-83"></a><a name="ArgDescr"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ArgDescr</span> <span class='hs-varid'>a</span>
<a name="line-84"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NoArg</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ no argument expected</span>
<a name="line-85"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ReqArg</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ option requires argument</span>
<a name="line-86"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OptArg</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ optional argument</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="OptKind"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>OptKind</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- kind of cmd line arg (internal use only):</span>
<a name="line-89"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Opt</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- an option</span>
<a name="line-90"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>UnreqOpt</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- an un-recognized option</span>
<a name="line-91"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>NonOpt</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- a non-option</span>
<a name="line-92"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>EndOfOpts</span> <span class='hs-comment'>-- end-of-options marker (i.e. "--")</span>
<a name="line-93"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OptErr</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- something went wrong...</span>
<a name="line-94"></a>
<a name="line-95"></a><a name="usageInfo"></a><span class='hs-comment'>-- | Return a string describing the usage of a command, derived from</span>
<a name="line-96"></a><span class='hs-comment'>-- the header (first argument) and the options described by the</span>
<a name="line-97"></a><span class='hs-comment'>-- second argument.</span>
<a name="line-98"></a><span class='hs-definition'>usageInfo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- header</span>
<a name="line-99"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptDescr</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- option descriptors</span>
<a name="line-100"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- nicely formatted decription of options</span>
<a name="line-101"></a><span class='hs-definition'>usageInfo</span> <span class='hs-varid'>header</span> <span class='hs-varid'>optDescr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unlines</span> <span class='hs-layout'>(</span><span class='hs-varid'>header</span><span class='hs-conop'>:</span><span class='hs-varid'>table</span><span class='hs-layout'>)</span>
<a name="line-102"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>ss</span><span class='hs-layout'>,</span><span class='hs-varid'>ls</span><span class='hs-layout'>,</span><span class='hs-varid'>ds</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unzip3</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-varid'>intercalate</span> <span class='hs-str'>", "</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmtShort</span> <span class='hs-varid'>ad</span><span class='hs-layout'>)</span> <span class='hs-varid'>sos</span><span class='hs-layout'>)</span>
<a name="line-103"></a> <span class='hs-layout'>,</span><span class='hs-varid'>concatMap</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmtLong</span> <span class='hs-varid'>ad</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>take</span> <span class='hs-num'>1</span> <span class='hs-varid'>los</span><span class='hs-layout'>)</span>
<a name="line-104"></a> <span class='hs-layout'>,</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-105"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Option</span> <span class='hs-varid'>sos</span> <span class='hs-varid'>los</span> <span class='hs-varid'>ad</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>optDescr</span> <span class='hs-keyglyph'>]</span>
<a name="line-106"></a> <span class='hs-varid'>ssWidth</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>maximum</span> <span class='hs-varop'>.</span> <span class='hs-varid'>map</span> <span class='hs-varid'>length</span><span class='hs-layout'>)</span> <span class='hs-varid'>ss</span>
<a name="line-107"></a> <span class='hs-varid'>lsWidth</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>maximum</span> <span class='hs-varop'>.</span> <span class='hs-varid'>map</span> <span class='hs-varid'>length</span><span class='hs-layout'>)</span> <span class='hs-varid'>ls</span>
<a name="line-108"></a> <span class='hs-varid'>dsWidth</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>30</span> <span class='hs-varop'>`max`</span> <span class='hs-layout'>(</span><span class='hs-num'>80</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>ssWidth</span> <span class='hs-varop'>+</span> <span class='hs-varid'>lsWidth</span> <span class='hs-varop'>+</span> <span class='hs-num'>3</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-109"></a> <span class='hs-varid'>table</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-str'>" "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>padTo</span> <span class='hs-varid'>ssWidth</span> <span class='hs-varid'>so'</span> <span class='hs-varop'>++</span>
<a name="line-110"></a> <span class='hs-str'>" "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>padTo</span> <span class='hs-varid'>lsWidth</span> <span class='hs-varid'>lo'</span> <span class='hs-varop'>++</span>
<a name="line-111"></a> <span class='hs-str'>" "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>d'</span>
<a name="line-112"></a> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>so</span><span class='hs-layout'>,</span><span class='hs-varid'>lo</span><span class='hs-layout'>,</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>zip3</span> <span class='hs-varid'>ss</span> <span class='hs-varid'>ls</span> <span class='hs-varid'>ds</span>
<a name="line-113"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>so'</span><span class='hs-layout'>,</span><span class='hs-varid'>lo'</span><span class='hs-layout'>,</span><span class='hs-varid'>d'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fmtOpt</span> <span class='hs-varid'>dsWidth</span> <span class='hs-varid'>so</span> <span class='hs-varid'>lo</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>]</span>
<a name="line-114"></a> <span class='hs-varid'>padTo</span> <span class='hs-varid'>n</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>take</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varop'>++</span> <span class='hs-varid'>repeat</span> <span class='hs-chr'>' '</span><span class='hs-layout'>)</span>
<a name="line-115"></a>
<a name="line-116"></a><a name="fmtOpt"></a><span class='hs-definition'>fmtOpt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</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-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-117"></a><span class='hs-definition'>fmtOpt</span> <span class='hs-varid'>descrWidth</span> <span class='hs-varid'>so</span> <span class='hs-varid'>lo</span> <span class='hs-varid'>descr</span> <span class='hs-keyglyph'>=</span>
<a name="line-118"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>wrapText</span> <span class='hs-varid'>descrWidth</span> <span class='hs-varid'>descr</span> <span class='hs-keyword'>of</span>
<a name="line-119"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>so</span><span class='hs-layout'>,</span><span class='hs-varid'>lo</span><span class='hs-layout'>,</span><span class='hs-str'>""</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-120"></a> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-varid'>ds</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>so</span><span class='hs-layout'>,</span><span class='hs-varid'>lo</span><span class='hs-layout'>,</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-str'>""</span><span class='hs-layout'>,</span><span class='hs-str'>""</span><span class='hs-layout'>,</span><span class='hs-varid'>d'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>d'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'>]</span>
<a name="line-121"></a>
<a name="line-122"></a><a name="fmtShort"></a><span class='hs-definition'>fmtShort</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ArgDescr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-123"></a><span class='hs-definition'>fmtShort</span> <span class='hs-layout'>(</span><span class='hs-conid'>NoArg</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>)</span> <span class='hs-varid'>so</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"-"</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>so</span><span class='hs-keyglyph'>]</span>
<a name="line-124"></a><span class='hs-definition'>fmtShort</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReqArg</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>so</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"-"</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>so</span><span class='hs-keyglyph'>]</span>
<a name="line-125"></a><span class='hs-definition'>fmtShort</span> <span class='hs-layout'>(</span><span class='hs-conid'>OptArg</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>so</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"-"</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>so</span><span class='hs-keyglyph'>]</span>
<a name="line-126"></a>
<a name="line-127"></a><a name="fmtLong"></a><span class='hs-definition'>fmtLong</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ArgDescr</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'>String</span>
<a name="line-128"></a><span class='hs-definition'>fmtLong</span> <span class='hs-layout'>(</span><span class='hs-conid'>NoArg</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>)</span> <span class='hs-varid'>lo</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"--"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>lo</span>
<a name="line-129"></a><span class='hs-definition'>fmtLong</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReqArg</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>ad</span><span class='hs-layout'>)</span> <span class='hs-varid'>lo</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"--"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>lo</span> <span class='hs-varop'>++</span> <span class='hs-str'>"="</span> <span class='hs-varop'>++</span> <span class='hs-varid'>ad</span>
<a name="line-130"></a><span class='hs-definition'>fmtLong</span> <span class='hs-layout'>(</span><span class='hs-conid'>OptArg</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>ad</span><span class='hs-layout'>)</span> <span class='hs-varid'>lo</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"--"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>lo</span> <span class='hs-varop'>++</span> <span class='hs-str'>"[="</span> <span class='hs-varop'>++</span> <span class='hs-varid'>ad</span> <span class='hs-varop'>++</span> <span class='hs-str'>"]"</span>
<a name="line-131"></a>
<a name="line-132"></a><a name="wrapText"></a><span class='hs-definition'>wrapText</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</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'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-133"></a><span class='hs-definition'>wrapText</span> <span class='hs-varid'>width</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>unwords</span> <span class='hs-varop'>.</span> <span class='hs-varid'>wrap</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span> <span class='hs-varop'>.</span> <span class='hs-varid'>words</span>
<a name="line-134"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>wrap</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-conid'>String</span><span class='hs-keyglyph'>]</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-keyglyph'>[</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span><span class='hs-keyglyph'>]</span>
<a name="line-135"></a> <span class='hs-varid'>wrap</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-conop'>:</span><span class='hs-varid'>ws</span><span class='hs-layout'>)</span>
<a name="line-136"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>length</span> <span class='hs-varid'>w</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span> <span class='hs-varop'>></span> <span class='hs-varid'>width</span>
<a name="line-137"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>wrap</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>w</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>ws</span>
<a name="line-138"></a> <span class='hs-varid'>wrap</span> <span class='hs-varid'>col</span> <span class='hs-varid'>line</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-conop'>:</span><span class='hs-varid'>ws</span><span class='hs-layout'>)</span>
<a name="line-139"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>col</span> <span class='hs-varop'>+</span> <span class='hs-varid'>length</span> <span class='hs-varid'>w</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span> <span class='hs-varop'>></span> <span class='hs-varid'>width</span>
<a name="line-140"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>line</span> <span class='hs-conop'>:</span> <span class='hs-varid'>wrap</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-conop'>:</span><span class='hs-varid'>ws</span><span class='hs-layout'>)</span>
<a name="line-141"></a> <span class='hs-varid'>wrap</span> <span class='hs-varid'>col</span> <span class='hs-varid'>line</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-conop'>:</span><span class='hs-varid'>ws</span><span class='hs-layout'>)</span>
<a name="line-142"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>col'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>col</span> <span class='hs-varop'>+</span> <span class='hs-varid'>length</span> <span class='hs-varid'>w</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span>
<a name="line-143"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>wrap</span> <span class='hs-varid'>col'</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-conop'>:</span><span class='hs-varid'>line</span><span class='hs-layout'>)</span> <span class='hs-varid'>ws</span>
<a name="line-144"></a> <span class='hs-varid'>wrap</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-145"></a> <span class='hs-varid'>wrap</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>line</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>line</span><span class='hs-keyglyph'>]</span>
<a name="line-146"></a>
<a name="line-147"></a><a name="getOpt"></a><span class='hs-comment'>{-|
<a name="line-148"></a>Process the command-line, and return the list of values that matched
<a name="line-149"></a>(and those that didn\'t). The arguments are:
<a name="line-150"></a>
<a name="line-151"></a>* The order requirements (see 'ArgOrder')
<a name="line-152"></a>
<a name="line-153"></a>* The option descriptions (see 'OptDescr')
<a name="line-154"></a>
<a name="line-155"></a>* The actual command line arguments (presumably got from
<a name="line-156"></a> 'System.Environment.getArgs').
<a name="line-157"></a>
<a name="line-158"></a>'getOpt' returns a triple consisting of the option arguments, a list
<a name="line-159"></a>of non-options, and a list of error messages.
<a name="line-160"></a>-}</span>
<a name="line-161"></a><span class='hs-definition'>getOpt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ArgOrder</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- non-option handling</span>
<a name="line-162"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptDescr</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- option descriptors</span>
<a name="line-163"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- the command-line arguments</span>
<a name="line-164"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>a</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> <span class='hs-comment'>-- (options,non-options,error messages)</span>
<a name="line-165"></a><span class='hs-definition'>getOpt</span> <span class='hs-varid'>ordering</span> <span class='hs-varid'>optDescr</span> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>os</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>,</span><span class='hs-varid'>es</span> <span class='hs-varop'>++</span> <span class='hs-varid'>map</span> <span class='hs-varid'>errUnrec</span> <span class='hs-varid'>us</span><span class='hs-layout'>)</span>
<a name="line-166"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>os</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>,</span><span class='hs-varid'>us</span><span class='hs-layout'>,</span><span class='hs-varid'>es</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getOpt'</span> <span class='hs-varid'>ordering</span> <span class='hs-varid'>optDescr</span> <span class='hs-varid'>args</span>
<a name="line-167"></a>
<a name="line-168"></a><a name="getOpt'"></a><span class='hs-comment'>{-|
<a name="line-169"></a>This is almost the same as 'getOpt', but returns a quadruple
<a name="line-170"></a>consisting of the option arguments, a list of non-options, a list of
<a name="line-171"></a>unrecognized options, and a list of error messages.
<a name="line-172"></a>-}</span>
<a name="line-173"></a><span class='hs-definition'>getOpt'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ArgOrder</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- non-option handling</span>
<a name="line-174"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptDescr</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- option descriptors</span>
<a name="line-175"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- the command-line arguments</span>
<a name="line-176"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>a</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><span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- (options,non-options,unrecognized,error messages)</span>
<a name="line-177"></a><span class='hs-definition'>getOpt'</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-178"></a><span class='hs-definition'>getOpt'</span> <span class='hs-varid'>ordering</span> <span class='hs-varid'>optDescr</span> <span class='hs-layout'>(</span><span class='hs-varid'>arg</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-varid'>procNextOpt</span> <span class='hs-varid'>opt</span> <span class='hs-varid'>ordering</span>
<a name="line-179"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>procNextOpt</span> <span class='hs-layout'>(</span><span class='hs-conid'>Opt</span> <span class='hs-varid'>o</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>o</span><span class='hs-conop'>:</span><span class='hs-varid'>os</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>,</span><span class='hs-varid'>us</span><span class='hs-layout'>,</span><span class='hs-varid'>es</span><span class='hs-layout'>)</span>
<a name="line-180"></a> <span class='hs-varid'>procNextOpt</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnreqOpt</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>os</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>,</span><span class='hs-varid'>u</span><span class='hs-conop'>:</span><span class='hs-varid'>us</span><span class='hs-layout'>,</span><span class='hs-varid'>es</span><span class='hs-layout'>)</span>
<a name="line-181"></a> <span class='hs-varid'>procNextOpt</span> <span class='hs-layout'>(</span><span class='hs-conid'>NonOpt</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-conid'>RequireOrder</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-182"></a> <span class='hs-varid'>procNextOpt</span> <span class='hs-layout'>(</span><span class='hs-conid'>NonOpt</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-conid'>Permute</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>os</span><span class='hs-layout'>,</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-varid'>us</span><span class='hs-layout'>,</span><span class='hs-varid'>es</span><span class='hs-layout'>)</span>
<a name="line-183"></a> <span class='hs-varid'>procNextOpt</span> <span class='hs-layout'>(</span><span class='hs-conid'>NonOpt</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReturnInOrder</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span><span class='hs-varid'>os</span><span class='hs-layout'>,</span> <span class='hs-varid'>xs</span><span class='hs-layout'>,</span><span class='hs-varid'>us</span><span class='hs-layout'>,</span><span class='hs-varid'>es</span><span class='hs-layout'>)</span>
<a name="line-184"></a> <span class='hs-varid'>procNextOpt</span> <span class='hs-conid'>EndOfOpts</span> <span class='hs-conid'>RequireOrder</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-185"></a> <span class='hs-varid'>procNextOpt</span> <span class='hs-conid'>EndOfOpts</span> <span class='hs-conid'>Permute</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-186"></a> <span class='hs-varid'>procNextOpt</span> <span class='hs-conid'>EndOfOpts</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReturnInOrder</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>f</span> <span class='hs-varid'>rest</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-187"></a> <span class='hs-varid'>procNextOpt</span> <span class='hs-layout'>(</span><span class='hs-conid'>OptErr</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>os</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>,</span><span class='hs-varid'>us</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>
<a name="line-188"></a>
<a name="line-189"></a> <span class='hs-layout'>(</span><span class='hs-varid'>opt</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-varid'>getNext</span> <span class='hs-varid'>arg</span> <span class='hs-varid'>args</span> <span class='hs-varid'>optDescr</span>
<a name="line-190"></a> <span class='hs-layout'>(</span><span class='hs-varid'>os</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>,</span><span class='hs-varid'>us</span><span class='hs-layout'>,</span><span class='hs-varid'>es</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getOpt'</span> <span class='hs-varid'>ordering</span> <span class='hs-varid'>optDescr</span> <span class='hs-varid'>rest</span>
<a name="line-191"></a>
<a name="line-192"></a><a name="getNext"></a><span class='hs-comment'>-- take a look at the next cmd line arg and decide what to do with it</span>
<a name="line-193"></a><span class='hs-definition'>getNext</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'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptDescr</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>OptKind</span> <span class='hs-varid'>a</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-194"></a><span class='hs-definition'>getNext</span> <span class='hs-layout'>(</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varid'>rest</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>EndOfOpts</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-195"></a><span class='hs-definition'>getNext</span> <span class='hs-layout'>(</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-varid'>rest</span> <span class='hs-varid'>optDescr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>longOpt</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>rest</span> <span class='hs-varid'>optDescr</span>
<a name="line-196"></a><span class='hs-definition'>getNext</span> <span class='hs-layout'>(</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</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-varid'>rest</span> <span class='hs-varid'>optDescr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>shortOpt</span> <span class='hs-varid'>x</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>rest</span> <span class='hs-varid'>optDescr</span>
<a name="line-197"></a><span class='hs-definition'>getNext</span> <span class='hs-varid'>a</span> <span class='hs-varid'>rest</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>NonOpt</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-198"></a>
<a name="line-199"></a><a name="longOpt"></a><span class='hs-comment'>-- handle long option</span>
<a name="line-200"></a><span class='hs-definition'>longOpt</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'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptDescr</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>OptKind</span> <span class='hs-varid'>a</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-201"></a><span class='hs-definition'>longOpt</span> <span class='hs-varid'>ls</span> <span class='hs-varid'>rs</span> <span class='hs-varid'>optDescr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>long</span> <span class='hs-varid'>ads</span> <span class='hs-varid'>arg</span> <span class='hs-varid'>rs</span>
<a name="line-202"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>opt</span><span class='hs-layout'>,</span><span class='hs-varid'>arg</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>break</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-chr'>'='</span><span class='hs-layout'>)</span> <span class='hs-varid'>ls</span>
<a name="line-203"></a> <span class='hs-varid'>getWith</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</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-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Option</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>optDescr</span>
<a name="line-204"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isJust</span> <span class='hs-layout'>(</span><span class='hs-varid'>find</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-varid'>opt</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-205"></a> <span class='hs-varid'>exact</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getWith</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-layout'>)</span>
<a name="line-206"></a> <span class='hs-varid'>options</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>exact</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>getWith</span> <span class='hs-varid'>isPrefixOf</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>exact</span>
<a name="line-207"></a> <span class='hs-varid'>ads</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>ad</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Option</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>ad</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>options</span> <span class='hs-keyglyph'>]</span>
<a name="line-208"></a> <span class='hs-varid'>optStr</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"--"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>opt</span>
<a name="line-209"></a>
<a name="line-210"></a> <span class='hs-varid'>long</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>errAmbig</span> <span class='hs-varid'>options</span> <span class='hs-varid'>optStr</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-211"></a> <span class='hs-varid'>long</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>NoArg</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>]</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Opt</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-212"></a> <span class='hs-varid'>long</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>NoArg</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-chr'>'='</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>errNoArg</span> <span class='hs-varid'>optStr</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-213"></a> <span class='hs-varid'>long</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>ReqArg</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>d</span><span class='hs-keyglyph'>]</span> <span class='hs-conid'>[]</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>errReq</span> <span class='hs-varid'>d</span> <span class='hs-varid'>optStr</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-214"></a> <span class='hs-varid'>long</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>ReqArg</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</span><span class='hs-keyglyph'>]</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Opt</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-215"></a> <span class='hs-varid'>long</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>ReqArg</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-chr'>'='</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Opt</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-216"></a> <span class='hs-varid'>long</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptArg</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</span><span class='hs-keyglyph'>]</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Opt</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-217"></a> <span class='hs-varid'>long</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptArg</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-chr'>'='</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Opt</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-218"></a> <span class='hs-varid'>long</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnreqOpt</span> <span class='hs-layout'>(</span><span class='hs-str'>"--"</span><span class='hs-varop'>++</span><span class='hs-varid'>ls</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-219"></a>
<a name="line-220"></a><a name="shortOpt"></a><span class='hs-comment'>-- handle short option</span>
<a name="line-221"></a><span class='hs-definition'>shortOpt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</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'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptDescr</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>OptKind</span> <span class='hs-varid'>a</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-222"></a><span class='hs-definition'>shortOpt</span> <span class='hs-varid'>y</span> <span class='hs-varid'>ys</span> <span class='hs-varid'>rs</span> <span class='hs-varid'>optDescr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>short</span> <span class='hs-varid'>ads</span> <span class='hs-varid'>ys</span> <span class='hs-varid'>rs</span>
<a name="line-223"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>options</span> <span class='hs-keyglyph'>=</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-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Option</span> <span class='hs-varid'>ss</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>optDescr</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>ss</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span> <span class='hs-varop'>==</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>]</span>
<a name="line-224"></a> <span class='hs-varid'>ads</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>ad</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Option</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>ad</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>options</span> <span class='hs-keyglyph'>]</span>
<a name="line-225"></a> <span class='hs-varid'>optStr</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>y</span><span class='hs-keyglyph'>]</span>
<a name="line-226"></a>
<a name="line-227"></a> <span class='hs-varid'>short</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>errAmbig</span> <span class='hs-varid'>options</span> <span class='hs-varid'>optStr</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-228"></a> <span class='hs-varid'>short</span> <span class='hs-layout'>(</span><span class='hs-conid'>NoArg</span> <span class='hs-varid'>a</span> <span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Opt</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-229"></a> <span class='hs-varid'>short</span> <span class='hs-layout'>(</span><span class='hs-conid'>NoArg</span> <span class='hs-varid'>a</span> <span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Opt</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-230"></a> <span class='hs-varid'>short</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReqArg</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>errReq</span> <span class='hs-varid'>d</span> <span class='hs-varid'>optStr</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-231"></a> <span class='hs-varid'>short</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReqArg</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Opt</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-232"></a> <span class='hs-varid'>short</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReqArg</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Opt</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-233"></a> <span class='hs-varid'>short</span> <span class='hs-layout'>(</span><span class='hs-conid'>OptArg</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Opt</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-234"></a> <span class='hs-varid'>short</span> <span class='hs-layout'>(</span><span class='hs-conid'>OptArg</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Opt</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-235"></a> <span class='hs-varid'>short</span> <span class='hs-conid'>[]</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnreqOpt</span> <span class='hs-varid'>optStr</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-236"></a> <span class='hs-varid'>short</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnreqOpt</span> <span class='hs-layout'>(</span><span class='hs-varid'>optStr</span><span class='hs-varop'>++</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-237"></a>
<a name="line-238"></a><span class='hs-comment'>-- miscellaneous error formatting</span>
<a name="line-239"></a>
<a name="line-240"></a><a name="errAmbig"></a><span class='hs-definition'>errAmbig</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptDescr</span> <span class='hs-varid'>a</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-conid'>OptKind</span> <span class='hs-varid'>a</span>
<a name="line-241"></a><span class='hs-definition'>errAmbig</span> <span class='hs-varid'>ods</span> <span class='hs-varid'>optStr</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>OptErr</span> <span class='hs-layout'>(</span><span class='hs-varid'>usageInfo</span> <span class='hs-varid'>header</span> <span class='hs-varid'>ods</span><span class='hs-layout'>)</span>
<a name="line-242"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>header</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"option `"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>optStr</span> <span class='hs-varop'>++</span> <span class='hs-str'>"' is ambiguous; could be one of:"</span>
<a name="line-243"></a>
<a name="line-244"></a><a name="errReq"></a><span class='hs-definition'>errReq</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>OptKind</span> <span class='hs-varid'>a</span>
<a name="line-245"></a><span class='hs-definition'>errReq</span> <span class='hs-varid'>d</span> <span class='hs-varid'>optStr</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>OptErr</span> <span class='hs-layout'>(</span><span class='hs-str'>"option `"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>optStr</span> <span class='hs-varop'>++</span> <span class='hs-str'>"' requires an argument "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>d</span> <span class='hs-varop'>++</span> <span class='hs-str'>"\n"</span><span class='hs-layout'>)</span>
<a name="line-246"></a>
<a name="line-247"></a><a name="errUnrec"></a><span class='hs-definition'>errUnrec</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-248"></a><span class='hs-definition'>errUnrec</span> <span class='hs-varid'>optStr</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"unrecognized option `"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>optStr</span> <span class='hs-varop'>++</span> <span class='hs-str'>"'\n"</span>
<a name="line-249"></a>
<a name="line-250"></a><a name="errNoArg"></a><span class='hs-definition'>errNoArg</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>OptKind</span> <span class='hs-varid'>a</span>
<a name="line-251"></a><span class='hs-definition'>errNoArg</span> <span class='hs-varid'>optStr</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>OptErr</span> <span class='hs-layout'>(</span><span class='hs-str'>"option `"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>optStr</span> <span class='hs-varop'>++</span> <span class='hs-str'>"' doesn't allow an argument\n"</span><span class='hs-layout'>)</span>
<a name="line-252"></a>
<a name="line-253"></a><span class='hs-comment'>{-
<a name="line-254"></a>-----------------------------------------------------------------------------------------
<a name="line-255"></a>-- and here a small and hopefully enlightening example:
<a name="line-256"></a>
<a name="line-257"></a>data Flag = Verbose | Version | Name String | Output String | Arg String deriving Show
<a name="line-258"></a>
<a name="line-259"></a>options :: [OptDescr Flag]
<a name="line-260"></a>options =
<a name="line-261"></a> [Option ['v'] ["verbose"] (NoArg Verbose) "verbosely list files",
<a name="line-262"></a> Option ['V','?'] ["version","release"] (NoArg Version) "show version info",
<a name="line-263"></a> Option ['o'] ["output"] (OptArg out "FILE") "use FILE for dump",
<a name="line-264"></a> Option ['n'] ["name"] (ReqArg Name "USER") "only dump USER's files"]
<a name="line-265"></a>
<a name="line-266"></a>out :: Maybe String -> Flag
<a name="line-267"></a>out Nothing = Output "stdout"
<a name="line-268"></a>out (Just o) = Output o
<a name="line-269"></a>
<a name="line-270"></a>test :: ArgOrder Flag -> [String] -> String
<a name="line-271"></a>test order cmdline = case getOpt order options cmdline of
<a name="line-272"></a> (o,n,[] ) -> "options=" ++ show o ++ " args=" ++ show n ++ "\n"
<a name="line-273"></a> (_,_,errs) -> concat errs ++ usageInfo header options
<a name="line-274"></a> where header = "Usage: foobar [OPTION...] files..."
<a name="line-275"></a>
<a name="line-276"></a>-- example runs:
<a name="line-277"></a>-- putStr (test RequireOrder ["foo","-v"])
<a name="line-278"></a>-- ==> options=[] args=["foo", "-v"]
<a name="line-279"></a>-- putStr (test Permute ["foo","-v"])
<a name="line-280"></a>-- ==> options=[Verbose] args=["foo"]
<a name="line-281"></a>-- putStr (test (ReturnInOrder Arg) ["foo","-v"])
<a name="line-282"></a>-- ==> options=[Arg "foo", Verbose] args=[]
<a name="line-283"></a>-- putStr (test Permute ["foo","--","-v"])
<a name="line-284"></a>-- ==> options=[] args=["foo", "-v"]
<a name="line-285"></a>-- putStr (test Permute ["-?o","--name","bar","--na=baz"])
<a name="line-286"></a>-- ==> options=[Version, Output "stdout", Name "bar", Name "baz"] args=[]
<a name="line-287"></a>-- putStr (test Permute ["--ver","foo"])
<a name="line-288"></a>-- ==> option `--ver' is ambiguous; could be one of:
<a name="line-289"></a>-- -v --verbose verbosely list files
<a name="line-290"></a>-- -V, -? --version, --release show version info
<a name="line-291"></a>-- Usage: foobar [OPTION...] files...
<a name="line-292"></a>-- -v --verbose verbosely list files
<a name="line-293"></a>-- -V, -? --version, --release show version info
<a name="line-294"></a>-- -o[FILE] --output[=FILE] use FILE for dump
<a name="line-295"></a>-- -n USER --name=USER only dump USER's files
<a name="line-296"></a>-----------------------------------------------------------------------------------------
<a name="line-297"></a>-}</span>
<a name="line-298"></a>
<a name="line-299"></a><span class='hs-comment'>{- $example
<a name="line-300"></a>
<a name="line-301"></a>To hopefully illuminate the role of the different data
<a name="line-302"></a>structures, here\'s the command-line options for a (very simple)
<a name="line-303"></a>compiler:
<a name="line-304"></a>
<a name="line-305"></a>> module Opts where
<a name="line-306"></a>>
<a name="line-307"></a>> import Distribution.GetOpt
<a name="line-308"></a>> import Data.Maybe ( fromMaybe )
<a name="line-309"></a>>
<a name="line-310"></a>> data Flag
<a name="line-311"></a>> = Verbose | Version
<a name="line-312"></a>> | Input String | Output String | LibDir String
<a name="line-313"></a>> deriving Show
<a name="line-314"></a>>
<a name="line-315"></a>> options :: [OptDescr Flag]
<a name="line-316"></a>> options =
<a name="line-317"></a>> [ Option ['v'] ["verbose"] (NoArg Verbose) "chatty output on stderr"
<a name="line-318"></a>> , Option ['V','?'] ["version"] (NoArg Version) "show version number"
<a name="line-319"></a>> , Option ['o'] ["output"] (OptArg outp "FILE") "output FILE"
<a name="line-320"></a>> , Option ['c'] [] (OptArg inp "FILE") "input FILE"
<a name="line-321"></a>> , Option ['L'] ["libdir"] (ReqArg LibDir "DIR") "library directory"
<a name="line-322"></a>> ]
<a name="line-323"></a>>
<a name="line-324"></a>> inp,outp :: Maybe String -> Flag
<a name="line-325"></a>> outp = Output . fromMaybe "stdout"
<a name="line-326"></a>> inp = Input . fromMaybe "stdin"
<a name="line-327"></a>>
<a name="line-328"></a>> compilerOpts :: [String] -> IO ([Flag], [String])
<a name="line-329"></a>> compilerOpts argv =
<a name="line-330"></a>> case getOpt Permute options argv of
<a name="line-331"></a>> (o,n,[] ) -> return (o,n)
<a name="line-332"></a>> (_,_,errs) -> ioError (userError (concat errs ++ usageInfo header options))
<a name="line-333"></a>> where header = "Usage: ic [OPTION...] files..."
<a name="line-334"></a>
<a name="line-335"></a>-}</span>
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