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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
<title>lib/Options.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE TypeSynonymInstances #-}</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module: Options</span>
<a name="line-6"></a><span class='hs-comment'>-- License: MIT</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- The @options@ package lets library and application developers easily work</span>
<a name="line-9"></a><span class='hs-comment'>-- with command-line options.</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- The following example is a full program that can accept two options,</span>
<a name="line-12"></a><span class='hs-comment'>-- @--message@ and @--quiet@:</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><span class='hs-comment'>--import Control.Applicative</span>
<a name="line-16"></a><span class='hs-comment'>--import Options</span>
<a name="line-17"></a><span class='hs-comment'>--</span>
<a name="line-18"></a><span class='hs-comment'>--data MainOptions = MainOptions</span>
<a name="line-19"></a><span class='hs-comment'>--    { optMessage :: String</span>
<a name="line-20"></a><span class='hs-comment'>--    , optQuiet :: Bool</span>
<a name="line-21"></a><span class='hs-comment'>--    }</span>
<a name="line-22"></a><span class='hs-comment'>--</span>
<a name="line-23"></a><span class='hs-comment'>--instance 'Options' MainOptions where</span>
<a name="line-24"></a><span class='hs-comment'>--    'defineOptions' = pure MainOptions</span>
<a name="line-25"></a><span class='hs-comment'>--        \&lt;*\&gt; 'simpleOption' \"message\" \"Hello world!\"</span>
<a name="line-26"></a><span class='hs-comment'>--            \"A message to show the user.\"</span>
<a name="line-27"></a><span class='hs-comment'>--        \&lt;*\&gt; 'simpleOption' \"quiet\" False</span>
<a name="line-28"></a><span class='hs-comment'>--            \"Whether to be quiet.\"</span>
<a name="line-29"></a><span class='hs-comment'>--</span>
<a name="line-30"></a><span class='hs-comment'>--main :: IO ()</span>
<a name="line-31"></a><span class='hs-comment'>--main = 'runCommand' $ \\opts args -&gt; do</span>
<a name="line-32"></a><span class='hs-comment'>--    if optQuiet opts</span>
<a name="line-33"></a><span class='hs-comment'>--        then return ()</span>
<a name="line-34"></a><span class='hs-comment'>--        else putStrLn (optMessage opts)</span>
<a name="line-35"></a><span class='hs-comment'>-- @</span>
<a name="line-36"></a><span class='hs-comment'>--</span>
<a name="line-37"></a><span class='hs-comment'>-- &gt;$ ./hello</span>
<a name="line-38"></a><span class='hs-comment'>-- &gt;Hello world!</span>
<a name="line-39"></a><span class='hs-comment'>-- &gt;$ ./hello --message='ciao mondo'</span>
<a name="line-40"></a><span class='hs-comment'>-- &gt;ciao mondo</span>
<a name="line-41"></a><span class='hs-comment'>-- &gt;$ ./hello --quiet</span>
<a name="line-42"></a><span class='hs-comment'>-- &gt;$</span>
<a name="line-43"></a><span class='hs-comment'>--</span>
<a name="line-44"></a><span class='hs-comment'>-- In addition, this library will automatically create documentation options</span>
<a name="line-45"></a><span class='hs-comment'>-- such as @--help@ and @--help-all@:</span>
<a name="line-46"></a><span class='hs-comment'>--</span>
<a name="line-47"></a><span class='hs-comment'>-- &gt;$ ./hello --help</span>
<a name="line-48"></a><span class='hs-comment'>-- &gt;Help Options:</span>
<a name="line-49"></a><span class='hs-comment'>-- &gt;  -h, --help</span>
<a name="line-50"></a><span class='hs-comment'>-- &gt;    Show option summary.</span>
<a name="line-51"></a><span class='hs-comment'>-- &gt;  --help-all</span>
<a name="line-52"></a><span class='hs-comment'>-- &gt;    Show all help options.</span>
<a name="line-53"></a><span class='hs-comment'>-- &gt;</span>
<a name="line-54"></a><span class='hs-comment'>-- &gt;Application Options:</span>
<a name="line-55"></a><span class='hs-comment'>-- &gt;  --message :: text</span>
<a name="line-56"></a><span class='hs-comment'>-- &gt;    A message to show the user.</span>
<a name="line-57"></a><span class='hs-comment'>-- &gt;    default: "Hello world!"</span>
<a name="line-58"></a><span class='hs-comment'>-- &gt;  --quiet :: bool</span>
<a name="line-59"></a><span class='hs-comment'>-- &gt;    Whether to be quiet.</span>
<a name="line-60"></a><span class='hs-comment'>-- &gt;    default: false</span>
<a name="line-61"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Options</span>
<a name="line-62"></a>	<span class='hs-layout'>(</span>
<a name="line-63"></a>	<span class='hs-comment'>-- * Defining options</span>
<a name="line-64"></a>	  <span class='hs-conid'>Options</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-65"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>defaultOptions</span>
<a name="line-66"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>simpleOption</span>
<a name="line-67"></a>	<span class='hs-layout'>,</span> <span class='hs-conid'>DefineOptions</span>
<a name="line-68"></a>	<span class='hs-layout'>,</span> <span class='hs-conid'>SimpleOptionType</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-69"></a>	
<a name="line-70"></a>	<span class='hs-comment'>-- * Defining subcommands</span>
<a name="line-71"></a>	<span class='hs-layout'>,</span> <span class='hs-conid'>Subcommand</span>
<a name="line-72"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>subcommand</span>
<a name="line-73"></a>	
<a name="line-74"></a>	<span class='hs-comment'>-- * Running main with options</span>
<a name="line-75"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>runCommand</span>
<a name="line-76"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>runSubcommand</span>
<a name="line-77"></a>	
<a name="line-78"></a>	<span class='hs-comment'>-- * Parsing argument lists</span>
<a name="line-79"></a>	<span class='hs-layout'>,</span> <span class='hs-conid'>Parsed</span>
<a name="line-80"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>parsedError</span>
<a name="line-81"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>parsedHelp</span>
<a name="line-82"></a>	
<a name="line-83"></a>	<span class='hs-comment'>-- ** Parsing options</span>
<a name="line-84"></a>	<span class='hs-layout'>,</span> <span class='hs-conid'>ParsedOptions</span>
<a name="line-85"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>parsedOptions</span>
<a name="line-86"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>parsedArguments</span>
<a name="line-87"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>parseOptions</span>
<a name="line-88"></a>	
<a name="line-89"></a>	<span class='hs-comment'>-- ** Parsing sub-commands</span>
<a name="line-90"></a>	<span class='hs-layout'>,</span> <span class='hs-conid'>ParsedSubcommand</span>
<a name="line-91"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>parsedSubcommand</span>
<a name="line-92"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>parseSubcommand</span>
<a name="line-93"></a>	
<a name="line-94"></a>	<span class='hs-comment'>-- * Advanced option definitions</span>
<a name="line-95"></a>	<span class='hs-layout'>,</span> <span class='hs-conid'>OptionType</span>
<a name="line-96"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>defineOption</span>
<a name="line-97"></a>	<span class='hs-layout'>,</span> <span class='hs-conid'>Option</span>
<a name="line-98"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionShortFlags</span>
<a name="line-99"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionLongFlags</span>
<a name="line-100"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionDefault</span>
<a name="line-101"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionDescription</span>
<a name="line-102"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionGroup</span>
<a name="line-103"></a>	
<a name="line-104"></a>	<span class='hs-comment'>-- ** Option groups</span>
<a name="line-105"></a>	<span class='hs-layout'>,</span> <span class='hs-conid'>Group</span>
<a name="line-106"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>group</span>
<a name="line-107"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>groupName</span>
<a name="line-108"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>groupTitle</span>
<a name="line-109"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>groupDescription</span>
<a name="line-110"></a>	
<a name="line-111"></a>	<span class='hs-comment'>-- * Option types</span>
<a name="line-112"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_bool</span>
<a name="line-113"></a>	
<a name="line-114"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_string</span>
<a name="line-115"></a>	
<a name="line-116"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_int</span>
<a name="line-117"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_int8</span>
<a name="line-118"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_int16</span>
<a name="line-119"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_int32</span>
<a name="line-120"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_int64</span>
<a name="line-121"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_word</span>
<a name="line-122"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_word8</span>
<a name="line-123"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_word16</span>
<a name="line-124"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_word32</span>
<a name="line-125"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_word64</span>
<a name="line-126"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_integer</span>
<a name="line-127"></a>	
<a name="line-128"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_float</span>
<a name="line-129"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_double</span>
<a name="line-130"></a>	
<a name="line-131"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_maybe</span>
<a name="line-132"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_list</span>
<a name="line-133"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_set</span>
<a name="line-134"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_map</span>
<a name="line-135"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType_enum</span>
<a name="line-136"></a>	
<a name="line-137"></a>	<span class='hs-comment'>-- ** Custom option types</span>
<a name="line-138"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionType</span>
<a name="line-139"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionTypeName</span>
<a name="line-140"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionTypeDefault</span>
<a name="line-141"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionTypeParse</span>
<a name="line-142"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionTypeShow</span>
<a name="line-143"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionTypeUnary</span>
<a name="line-144"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionTypeMerge</span>
<a name="line-145"></a>	<span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-146"></a>
<a name="line-147"></a><span class='hs-keyword'>import</span>           <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span>
<a name="line-148"></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'>forM_</span><span class='hs-layout'>)</span>
<a name="line-149"></a><span class='hs-keyword'>import</span>           <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span><span class='hs-layout'>,</span> <span class='hs-varid'>runErrorT</span><span class='hs-layout'>,</span> <span class='hs-varid'>throwError</span><span class='hs-layout'>)</span>
<a name="line-150"></a><span class='hs-keyword'>import</span>           <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span> <span class='hs-layout'>(</span><span class='hs-varid'>liftIO</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadIO</span><span class='hs-layout'>)</span>
<a name="line-151"></a><span class='hs-keyword'>import</span>           <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Functor</span><span class='hs-varop'>.</span><span class='hs-conid'>Identity</span>
<a name="line-152"></a><span class='hs-keyword'>import</span>           <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Int</span>
<a name="line-153"></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'>intercalate</span><span class='hs-layout'>)</span>
<a name="line-154"></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'>Map</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Map</span>
<a name="line-155"></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-156"></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'>Set</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Set</span>
<a name="line-157"></a><span class='hs-keyword'>import</span>           <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Word</span>
<a name="line-158"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Environment</span>
<a name="line-159"></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'>exitFailure</span><span class='hs-layout'>,</span> <span class='hs-varid'>exitSuccess</span><span class='hs-layout'>)</span>
<a name="line-160"></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'>hPutStr</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> <span class='hs-varid'>stdout</span><span class='hs-layout'>)</span>
<a name="line-161"></a>
<a name="line-162"></a><span class='hs-keyword'>import</span>           <span class='hs-conid'>Options</span><span class='hs-varop'>.</span><span class='hs-conid'>Help</span>
<a name="line-163"></a><span class='hs-keyword'>import</span>           <span class='hs-conid'>Options</span><span class='hs-varop'>.</span><span class='hs-conid'>Tokenize</span>
<a name="line-164"></a><span class='hs-keyword'>import</span>           <span class='hs-conid'>Options</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span>
<a name="line-165"></a><span class='hs-keyword'>import</span>           <span class='hs-conid'>Options</span><span class='hs-varop'>.</span><span class='hs-conid'>Util</span> <span class='hs-layout'>(</span><span class='hs-varid'>mapEither</span><span class='hs-layout'>)</span>
<a name="line-166"></a>
<a name="line-167"></a><a name="Options"></a><span class='hs-comment'>-- | Options are defined together in a single data type, which will be an</span>
<a name="line-168"></a><a name="Options"></a><span class='hs-comment'>-- instance of 'Options'.</span>
<a name="line-169"></a><a name="Options"></a><span class='hs-comment'>--</span>
<a name="line-170"></a><a name="Options"></a><span class='hs-comment'>-- See 'defineOptions' for details on defining instances of 'Options'.</span>
<a name="line-171"></a><a name="Options"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Options</span> <span class='hs-varid'>opts</span> <span class='hs-keyword'>where</span>
<a name="line-172"></a>	<span class='hs-comment'>-- | Defines the structure and metadata of the options in this type,</span>
<a name="line-173"></a>	<span class='hs-comment'>-- including their types, flag names, and documentation.</span>
<a name="line-174"></a>	<span class='hs-comment'>--</span>
<a name="line-175"></a>	<span class='hs-comment'>-- Options with a basic type and a single flag name may be defined</span>
<a name="line-176"></a>	<span class='hs-comment'>-- with 'simpleOption'. Options with more complex requirements may</span>
<a name="line-177"></a>	<span class='hs-comment'>-- be defined with 'defineOption'.</span>
<a name="line-178"></a>	<span class='hs-comment'>--</span>
<a name="line-179"></a>	<span class='hs-comment'>-- Non-option fields in the type may be set using applicative functions</span>
<a name="line-180"></a>	<span class='hs-comment'>-- such as 'pure'.</span>
<a name="line-181"></a>	<span class='hs-comment'>--</span>
<a name="line-182"></a>	<span class='hs-comment'>-- Options may be included from another type by using a nested call to</span>
<a name="line-183"></a>	<span class='hs-comment'>-- 'defineOptions'.</span>
<a name="line-184"></a>	<span class='hs-comment'>--</span>
<a name="line-185"></a>	<span class='hs-comment'>-- Library authors are encouraged to aggregate their options into a</span>
<a name="line-186"></a>	<span class='hs-comment'>-- few top-level types, so application authors can include it</span>
<a name="line-187"></a>	<span class='hs-comment'>-- easily in their own option definitions.</span>
<a name="line-188"></a>	<span class='hs-varid'>defineOptions</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DefineOptions</span> <span class='hs-varid'>opts</span>
<a name="line-189"></a>
<a name="line-190"></a><a name="DefineOptions"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DefineOptions</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DefineOptions</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-conid'>Integer</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>Integer</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptionInfo</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Integer</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-conid'>OptionKey</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Token</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-layout'>(</span><span class='hs-conid'>Integer</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-191"></a>
<a name="line-192"></a><a name="instance%20Functor%20DefineOptions"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-conid'>DefineOptions</span> <span class='hs-keyword'>where</span>
<a name="line-193"></a>	<span class='hs-varid'>fmap</span> <span class='hs-varid'>fn</span> <span class='hs-layout'>(</span><span class='hs-conid'>DefineOptions</span> <span class='hs-varid'>defaultValue</span> <span class='hs-varid'>getInfo</span> <span class='hs-varid'>parse</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DefineOptions</span> <span class='hs-layout'>(</span><span class='hs-varid'>fn</span> <span class='hs-varid'>defaultValue</span><span class='hs-layout'>)</span> <span class='hs-varid'>getInfo</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>key</span> <span class='hs-varid'>tokens</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>parse</span> <span class='hs-varid'>key</span> <span class='hs-varid'>tokens</span> <span class='hs-keyword'>of</span>
<a name="line-194"></a>		<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-195"></a>		<span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>key'</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>key'</span><span class='hs-layout'>,</span> <span class='hs-varid'>fn</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-196"></a>
<a name="line-197"></a><a name="instance%20Applicative%20DefineOptions"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Applicative</span> <span class='hs-conid'>DefineOptions</span> <span class='hs-keyword'>where</span>
<a name="line-198"></a>	<span class='hs-varid'>pure</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DefineOptions</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>key</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>key</span><span class='hs-layout'>,</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>key</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>key</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-199"></a>	<span class='hs-layout'>(</span><span class='hs-conid'>DefineOptions</span> <span class='hs-varid'>acc_default</span> <span class='hs-varid'>acc_getInfo</span> <span class='hs-varid'>acc_parse</span><span class='hs-layout'>)</span> <span class='hs-varop'>&lt;*&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>DefineOptions</span> <span class='hs-varid'>defaultValue</span> <span class='hs-varid'>getInfo</span> <span class='hs-varid'>parse</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DefineOptions</span>
<a name="line-200"></a>		<span class='hs-layout'>(</span><span class='hs-varid'>acc_default</span> <span class='hs-varid'>defaultValue</span><span class='hs-layout'>)</span>
<a name="line-201"></a>		<span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>key</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>acc_getInfo</span> <span class='hs-varid'>key</span> <span class='hs-keyword'>of</span>
<a name="line-202"></a>			<span class='hs-layout'>(</span><span class='hs-varid'>key'</span><span class='hs-layout'>,</span> <span class='hs-varid'>infos</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>getInfo</span> <span class='hs-varid'>key'</span> <span class='hs-keyword'>of</span>
<a name="line-203"></a>				<span class='hs-layout'>(</span><span class='hs-varid'>key''</span><span class='hs-layout'>,</span> <span class='hs-varid'>infos'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>key''</span><span class='hs-layout'>,</span> <span class='hs-varid'>infos</span> <span class='hs-varop'>++</span> <span class='hs-varid'>infos'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-204"></a>		<span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>key</span> <span class='hs-varid'>tokens</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>acc_parse</span> <span class='hs-varid'>key</span> <span class='hs-varid'>tokens</span> <span class='hs-keyword'>of</span>
<a name="line-205"></a>			<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-206"></a>			<span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>key'</span><span class='hs-layout'>,</span> <span class='hs-varid'>fn</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>parse</span> <span class='hs-varid'>key'</span> <span class='hs-varid'>tokens</span> <span class='hs-keyword'>of</span>
<a name="line-207"></a>				<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-208"></a>				<span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>key''</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>key''</span><span class='hs-layout'>,</span> <span class='hs-varid'>fn</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-209"></a>
<a name="line-210"></a><a name="defaultOptions"></a><span class='hs-comment'>-- | An options value containing only the default values for each option.</span>
<a name="line-211"></a><span class='hs-comment'>-- This is equivalent to the options value when parsing an empty argument</span>
<a name="line-212"></a><span class='hs-comment'>-- list.</span>
<a name="line-213"></a><span class='hs-definition'>defaultOptions</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Options</span> <span class='hs-varid'>opts</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>opts</span>
<a name="line-214"></a><span class='hs-definition'>defaultOptions</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>defineOptions</span> <span class='hs-keyword'>of</span>
<a name="line-215"></a>	<span class='hs-layout'>(</span><span class='hs-conid'>DefineOptions</span> <span class='hs-varid'>def</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>def</span>
<a name="line-216"></a>
<a name="line-217"></a><a name="OptionType"></a><span class='hs-comment'>-- | An option's type determines how the option will be parsed, and which</span>
<a name="line-218"></a><a name="OptionType"></a><span class='hs-comment'>-- Haskell type the parsed value will be stored as. There are many types</span>
<a name="line-219"></a><a name="OptionType"></a><span class='hs-comment'>-- available, covering most basic types and a few more advanced types.</span>
<a name="line-220"></a><a name="OptionType"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>OptionType</span>
<a name="line-221"></a>	<span class='hs-layout'>{</span>
<a name="line-222"></a>	<span class='hs-comment'>-- | The name of this option type; used in @--help@ output.</span>
<a name="line-223"></a>	  <span class='hs-varid'>optionTypeName</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-224"></a>	
<a name="line-225"></a>	<span class='hs-comment'>-- | The default value for options of this type. This will be used</span>
<a name="line-226"></a>	<span class='hs-comment'>-- if 'optionDefault' is not set when defining the option.</span>
<a name="line-227"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionTypeDefault</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>val</span>
<a name="line-228"></a>	
<a name="line-229"></a>	<span class='hs-comment'>-- | Try to parse the given string to an option value. If parsing</span>
<a name="line-230"></a>	<span class='hs-comment'>-- fails, an error message will be returned.</span>
<a name="line-231"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionTypeParse</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>val</span>
<a name="line-232"></a>	
<a name="line-233"></a>	<span class='hs-comment'>-- | Format the value for display; used in @--help@ output.</span>
<a name="line-234"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionTypeShow</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span>
<a name="line-235"></a>	
<a name="line-236"></a>	<span class='hs-comment'>-- | If not Nothing, then options of this type may be set by a unary</span>
<a name="line-237"></a>	<span class='hs-comment'>-- flag. The option will be parsed as if the given value were set.</span>
<a name="line-238"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionTypeUnary</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>val</span>
<a name="line-239"></a>	
<a name="line-240"></a>	<span class='hs-comment'>-- | If not Nothing, then options of this type may be set with repeated</span>
<a name="line-241"></a>	<span class='hs-comment'>-- flags. Each flag will be parsed with 'optionTypeParse', and the</span>
<a name="line-242"></a>	<span class='hs-comment'>-- resulting parsed values will be passed to this function for merger</span>
<a name="line-243"></a>	<span class='hs-comment'>-- into the final value.</span>
<a name="line-244"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionTypeMerge</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>val</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>val</span><span class='hs-layout'>)</span>
<a name="line-245"></a>	<span class='hs-layout'>}</span>
<a name="line-246"></a>
<a name="line-247"></a><a name="group"></a><span class='hs-comment'>-- | Define an option group with the given name and title. Use</span>
<a name="line-248"></a><span class='hs-comment'>-- 'groupDescription' to add additional descriptive text, if needed.</span>
<a name="line-249"></a><span class='hs-definition'>group</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ Name</span>
<a name="line-250"></a>      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ Title; see 'groupTitle'.</span>
<a name="line-251"></a>      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ Description; see 'groupDescription'.</span>
<a name="line-252"></a>      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Group</span>
<a name="line-253"></a><span class='hs-definition'>group</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Group</span>
<a name="line-254"></a>
<a name="line-255"></a><a name="optionType"></a><span class='hs-comment'>-- | Define a new option type with the given name, default, and behavior.</span>
<a name="line-256"></a><span class='hs-definition'>optionType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ Name</span>
<a name="line-257"></a>           <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>val</span> <span class='hs-comment'>-- ^ Default value</span>
<a name="line-258"></a>           <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>val</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Parser</span>
<a name="line-259"></a>           <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>val</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Formatter</span>
<a name="line-260"></a>           <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>val</span>
<a name="line-261"></a><span class='hs-definition'>optionType</span> <span class='hs-varid'>name</span> <span class='hs-varid'>def</span> <span class='hs-varid'>parse</span> <span class='hs-varid'>show'</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>name</span> <span class='hs-varid'>def</span> <span class='hs-varid'>parse</span> <span class='hs-varid'>show'</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span>
<a name="line-262"></a>
<a name="line-263"></a><a name="SimpleOptionType"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-264"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>a</span>
<a name="line-265"></a>
<a name="line-266"></a><a name="instance%20SimpleOptionType%20Bool"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Bool</span> <span class='hs-keyword'>where</span>
<a name="line-267"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_bool</span>
<a name="line-268"></a>
<a name="line-269"></a><a name="optionType_bool"></a><span class='hs-comment'>-- | Store an option as a @'Bool'@. The option's value must be either</span>
<a name="line-270"></a><span class='hs-comment'>-- @\"true\"@ or @\"false\"@.</span>
<a name="line-271"></a><span class='hs-comment'>--</span>
<a name="line-272"></a><span class='hs-comment'>-- Boolean options are unary, which means that their value is optional when</span>
<a name="line-273"></a><span class='hs-comment'>-- specified on the command line. If a flag is present, the option is set to</span>
<a name="line-274"></a><span class='hs-comment'>-- True.</span>
<a name="line-275"></a><span class='hs-comment'>--</span>
<a name="line-276"></a><span class='hs-comment'>-- &gt;$ ./app -q</span>
<a name="line-277"></a><span class='hs-comment'>-- &gt;$ ./app --quiet</span>
<a name="line-278"></a><span class='hs-comment'>--</span>
<a name="line-279"></a><span class='hs-comment'>-- Boolean options may still be specified explicitly by using long flags with</span>
<a name="line-280"></a><span class='hs-comment'>-- the @--flag=value@ format. This is the only way to set a unary flag to</span>
<a name="line-281"></a><span class='hs-comment'>-- @\"false\"@.</span>
<a name="line-282"></a><span class='hs-comment'>--</span>
<a name="line-283"></a><span class='hs-comment'>-- &gt;$ ./app --quiet=true</span>
<a name="line-284"></a><span class='hs-comment'>-- &gt;$ ./app --quiet=false</span>
<a name="line-285"></a><span class='hs-definition'>optionType_bool</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Bool</span>
<a name="line-286"></a><span class='hs-definition'>optionType_bool</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionType</span> <span class='hs-str'>"bool"</span> <span class='hs-conid'>False</span> <span class='hs-varid'>parseBool</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>then</span> <span class='hs-str'>"true"</span> <span class='hs-keyword'>else</span> <span class='hs-str'>"false"</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-287"></a>	<span class='hs-layout'>{</span> <span class='hs-varid'>optionTypeUnary</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>True</span>
<a name="line-288"></a>	<span class='hs-layout'>}</span>
<a name="line-289"></a>
<a name="line-290"></a><a name="parseBool"></a><span class='hs-definition'>parseBool</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-conid'>Bool</span>
<a name="line-291"></a><span class='hs-definition'>parseBool</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-292"></a>	<span class='hs-str'>"true"</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-conid'>True</span>
<a name="line-293"></a>	<span class='hs-str'>"false"</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-conid'>False</span>
<a name="line-294"></a>	<span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>s</span> <span class='hs-varop'>++</span> <span class='hs-str'>" is not in {\"true\", \"false\"}."</span><span class='hs-layout'>)</span>
<a name="line-295"></a>
<a name="line-296"></a><a name="instance%20SimpleOptionType%20String"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>String</span> <span class='hs-keyword'>where</span>
<a name="line-297"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_string</span>
<a name="line-298"></a>
<a name="line-299"></a><a name="optionType_string"></a><span class='hs-comment'>-- | Store an option value as a @'String'@. The value is decoded to Unicode</span>
<a name="line-300"></a><span class='hs-comment'>-- first, if needed. The value may contain non-Unicode bytes, in which case</span>
<a name="line-301"></a><span class='hs-comment'>-- they will be stored using GHC 7.4's encoding for mixed-use strings.</span>
<a name="line-302"></a><span class='hs-definition'>optionType_string</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>String</span>
<a name="line-303"></a><span class='hs-definition'>optionType_string</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType</span> <span class='hs-str'>"text"</span> <span class='hs-str'>""</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>show</span>
<a name="line-304"></a>
<a name="line-305"></a><a name="instance%20SimpleOptionType%20Integer"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Integer</span> <span class='hs-keyword'>where</span>
<a name="line-306"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_integer</span>
<a name="line-307"></a>
<a name="line-308"></a><a name="optionType_integer"></a><span class='hs-comment'>-- | Store an option as an @'Integer'@. The option value must be an integer.</span>
<a name="line-309"></a><span class='hs-comment'>-- There is no minimum or maximum value.</span>
<a name="line-310"></a><span class='hs-definition'>optionType_integer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Integer</span>
<a name="line-311"></a><span class='hs-definition'>optionType_integer</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType</span> <span class='hs-str'>"integer"</span> <span class='hs-num'>0</span> <span class='hs-varid'>parseInteger</span> <span class='hs-varid'>show</span>
<a name="line-312"></a>
<a name="line-313"></a><a name="parseInteger"></a><span class='hs-definition'>parseInteger</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-conid'>Integer</span>
<a name="line-314"></a><span class='hs-definition'>parseInteger</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parsed</span> <span class='hs-keyword'>where</span>
<a name="line-315"></a>	<span class='hs-varid'>parsed</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>valid</span>
<a name="line-316"></a>		<span class='hs-keyword'>then</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>read</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-317"></a>		<span class='hs-keyword'>else</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>s</span> <span class='hs-varop'>++</span> <span class='hs-str'>" is not an integer."</span><span class='hs-layout'>)</span>
<a name="line-318"></a>	<span class='hs-varid'>valid</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-319"></a>		<span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>False</span>
<a name="line-320"></a>		<span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>allDigits</span> <span class='hs-varid'>s'</span>
<a name="line-321"></a>		<span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>allDigits</span> <span class='hs-varid'>s</span>
<a name="line-322"></a>	<span class='hs-varid'>allDigits</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>all</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>c</span> <span class='hs-varop'>&gt;=</span> <span class='hs-chr'>'0'</span> <span class='hs-varop'>&amp;&amp;</span> <span class='hs-varid'>c</span> <span class='hs-varop'>&lt;=</span> <span class='hs-chr'>'9'</span><span class='hs-layout'>)</span>
<a name="line-323"></a>
<a name="line-324"></a><a name="parseBoundedIntegral"></a><span class='hs-definition'>parseBoundedIntegral</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Bounded</span> <span class='hs-varid'>a</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'>=&gt;</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>a</span>
<a name="line-325"></a><span class='hs-definition'>parseBoundedIntegral</span> <span class='hs-varid'>label</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parse</span> <span class='hs-keyword'>where</span>
<a name="line-326"></a>	<span class='hs-varid'>getBounds</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Bounded</span> <span class='hs-varid'>a</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'>=&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>Integer</span><span class='hs-layout'>,</span> <span class='hs-conid'>Integer</span><span class='hs-layout'>)</span>
<a name="line-327"></a>	<span class='hs-varid'>getBounds</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>min'</span> <span class='hs-varid'>max'</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>toInteger</span> <span class='hs-varid'>min'</span><span class='hs-layout'>,</span> <span class='hs-varid'>toInteger</span> <span class='hs-varid'>max'</span><span class='hs-layout'>)</span>
<a name="line-328"></a>	
<a name="line-329"></a>	<span class='hs-layout'>(</span><span class='hs-varid'>minInt</span><span class='hs-layout'>,</span> <span class='hs-varid'>maxInt</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getBounds</span> <span class='hs-varid'>parse</span> <span class='hs-varid'>minBound</span> <span class='hs-varid'>maxBound</span>
<a name="line-330"></a>	
<a name="line-331"></a>	<span class='hs-varid'>parse</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>parseInteger</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-332"></a>		<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-333"></a>		<span class='hs-conid'>Right</span> <span class='hs-varid'>int</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>int</span> <span class='hs-varop'>&lt;</span> <span class='hs-varid'>minInt</span> <span class='hs-varop'>||</span> <span class='hs-varid'>int</span> <span class='hs-varop'>&gt;</span> <span class='hs-varid'>maxInt</span>
<a name="line-334"></a>			<span class='hs-keyword'>then</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>int</span> <span class='hs-varop'>++</span> <span class='hs-str'>" is not within bounds ["</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>minInt</span> <span class='hs-varop'>++</span> <span class='hs-str'>":"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>maxInt</span> <span class='hs-varop'>++</span> <span class='hs-str'>"] of type "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>label</span> <span class='hs-varop'>++</span> <span class='hs-str'>"."</span><span class='hs-layout'>)</span>
<a name="line-335"></a>			<span class='hs-keyword'>else</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromInteger</span> <span class='hs-varid'>int</span><span class='hs-layout'>)</span>
<a name="line-336"></a>
<a name="line-337"></a><a name="optionTypeBoundedInt"></a><span class='hs-definition'>optionTypeBoundedInt</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Bounded</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>a</span>
<a name="line-338"></a><span class='hs-definition'>optionTypeBoundedInt</span> <span class='hs-varid'>tName</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType</span> <span class='hs-varid'>tName</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseBoundedIntegral</span> <span class='hs-varid'>tName</span><span class='hs-layout'>)</span> <span class='hs-varid'>show</span>
<a name="line-339"></a>
<a name="line-340"></a><a name="instance%20SimpleOptionType%20Int"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Int</span> <span class='hs-keyword'>where</span>
<a name="line-341"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_int</span>
<a name="line-342"></a>
<a name="line-343"></a><a name="optionType_int"></a><span class='hs-comment'>-- | Store an option as an @'Int'@. The option value must be an integer /n/</span>
<a name="line-344"></a><span class='hs-comment'>-- such that @'minBound' &lt;= n &lt;= 'maxBound'@.</span>
<a name="line-345"></a><span class='hs-definition'>optionType_int</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Int</span>
<a name="line-346"></a><span class='hs-definition'>optionType_int</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeBoundedInt</span> <span class='hs-str'>"int"</span>
<a name="line-347"></a>
<a name="line-348"></a><a name="instance%20SimpleOptionType%20Int8"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Int8</span> <span class='hs-keyword'>where</span>
<a name="line-349"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_int8</span>
<a name="line-350"></a>
<a name="line-351"></a><a name="optionType_int8"></a><span class='hs-comment'>-- | Store an option as an @'Int8'@. The option value must be an integer /n/</span>
<a name="line-352"></a><span class='hs-comment'>-- such that @'minBound' &lt;= n &lt;= 'maxBound'@.</span>
<a name="line-353"></a><span class='hs-definition'>optionType_int8</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Int8</span>
<a name="line-354"></a><span class='hs-definition'>optionType_int8</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeBoundedInt</span> <span class='hs-str'>"int8"</span>
<a name="line-355"></a>
<a name="line-356"></a><a name="instance%20SimpleOptionType%20Int16"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Int16</span> <span class='hs-keyword'>where</span>
<a name="line-357"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_int16</span>
<a name="line-358"></a>
<a name="line-359"></a><a name="optionType_int16"></a><span class='hs-comment'>-- | Store an option as an @'Int16'@. The option value must be an integer /n/</span>
<a name="line-360"></a><span class='hs-comment'>-- such that @'minBound' &lt;= n &lt;= 'maxBound'@.</span>
<a name="line-361"></a><span class='hs-definition'>optionType_int16</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Int16</span>
<a name="line-362"></a><span class='hs-definition'>optionType_int16</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeBoundedInt</span> <span class='hs-str'>"int16"</span>
<a name="line-363"></a>
<a name="line-364"></a><a name="instance%20SimpleOptionType%20Int32"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Int32</span> <span class='hs-keyword'>where</span>
<a name="line-365"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_int32</span>
<a name="line-366"></a>
<a name="line-367"></a><a name="optionType_int32"></a><span class='hs-comment'>-- | Store an option as an @'Int32'@. The option value must be an integer /n/</span>
<a name="line-368"></a><span class='hs-comment'>-- such that @'minBound' &lt;= n &lt;= 'maxBound'@.</span>
<a name="line-369"></a><span class='hs-definition'>optionType_int32</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Int32</span>
<a name="line-370"></a><span class='hs-definition'>optionType_int32</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeBoundedInt</span> <span class='hs-str'>"int32"</span>
<a name="line-371"></a>
<a name="line-372"></a><a name="instance%20SimpleOptionType%20Int64"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Int64</span> <span class='hs-keyword'>where</span>
<a name="line-373"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_int64</span>
<a name="line-374"></a>
<a name="line-375"></a><a name="optionType_int64"></a><span class='hs-comment'>-- | Store an option as an @'Int64'@. The option value must be an integer /n/</span>
<a name="line-376"></a><span class='hs-comment'>-- such that @'minBound' &lt;= n &lt;= 'maxBound'@.</span>
<a name="line-377"></a><span class='hs-definition'>optionType_int64</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Int64</span>
<a name="line-378"></a><span class='hs-definition'>optionType_int64</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeBoundedInt</span> <span class='hs-str'>"int64"</span>
<a name="line-379"></a>
<a name="line-380"></a><a name="instance%20SimpleOptionType%20Word"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Word</span> <span class='hs-keyword'>where</span>
<a name="line-381"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_word</span>
<a name="line-382"></a>
<a name="line-383"></a><a name="optionType_word"></a><span class='hs-comment'>-- | Store an option as a @'Word'@. The option value must be a positive</span>
<a name="line-384"></a><span class='hs-comment'>-- integer /n/ such that @0 &lt;= n &lt;= 'maxBound'@.</span>
<a name="line-385"></a><span class='hs-definition'>optionType_word</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Word</span>
<a name="line-386"></a><span class='hs-definition'>optionType_word</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeBoundedInt</span> <span class='hs-str'>"uint"</span>
<a name="line-387"></a>
<a name="line-388"></a><a name="instance%20SimpleOptionType%20Word8"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Word8</span> <span class='hs-keyword'>where</span>
<a name="line-389"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_word8</span>
<a name="line-390"></a>
<a name="line-391"></a><a name="optionType_word8"></a><span class='hs-comment'>-- | Store an option as a @'Word8'@. The option value must be a positive</span>
<a name="line-392"></a><span class='hs-comment'>-- integer /n/ such that @0 &lt;= n &lt;= 'maxBound'@.</span>
<a name="line-393"></a><span class='hs-definition'>optionType_word8</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Word8</span>
<a name="line-394"></a><span class='hs-definition'>optionType_word8</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeBoundedInt</span> <span class='hs-str'>"uint8"</span>
<a name="line-395"></a>
<a name="line-396"></a><a name="instance%20SimpleOptionType%20Word16"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Word16</span> <span class='hs-keyword'>where</span>
<a name="line-397"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_word16</span>
<a name="line-398"></a>
<a name="line-399"></a><a name="optionType_word16"></a><span class='hs-comment'>-- | Store an option as a @'Word16'@. The option value must be a positive</span>
<a name="line-400"></a><span class='hs-comment'>-- integer /n/ such that @0 &lt;= n &lt;= 'maxBound'@.</span>
<a name="line-401"></a><span class='hs-definition'>optionType_word16</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Word16</span>
<a name="line-402"></a><span class='hs-definition'>optionType_word16</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeBoundedInt</span> <span class='hs-str'>"uint16"</span>
<a name="line-403"></a>
<a name="line-404"></a><a name="instance%20SimpleOptionType%20Word32"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Word32</span> <span class='hs-keyword'>where</span>
<a name="line-405"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_word32</span>
<a name="line-406"></a>
<a name="line-407"></a><a name="optionType_word32"></a><span class='hs-comment'>-- | Store an option as a @'Word32'@. The option value must be a positive</span>
<a name="line-408"></a><span class='hs-comment'>-- integer /n/ such that @0 &lt;= n &lt;= 'maxBound'@.</span>
<a name="line-409"></a><span class='hs-definition'>optionType_word32</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Word32</span>
<a name="line-410"></a><span class='hs-definition'>optionType_word32</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeBoundedInt</span> <span class='hs-str'>"uint32"</span>
<a name="line-411"></a>
<a name="line-412"></a><a name="instance%20SimpleOptionType%20Word64"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Word64</span> <span class='hs-keyword'>where</span>
<a name="line-413"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_word64</span>
<a name="line-414"></a>
<a name="line-415"></a><a name="optionType_word64"></a><span class='hs-comment'>-- | Store an option as a @'Word64'@. The option value must be a positive</span>
<a name="line-416"></a><span class='hs-comment'>-- integer /n/ such that @0 &lt;= n &lt;= 'maxBound'@.</span>
<a name="line-417"></a><span class='hs-definition'>optionType_word64</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Word64</span>
<a name="line-418"></a><span class='hs-definition'>optionType_word64</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeBoundedInt</span> <span class='hs-str'>"uint64"</span>
<a name="line-419"></a>
<a name="line-420"></a><a name="instance%20SimpleOptionType%20Float"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Float</span> <span class='hs-keyword'>where</span>
<a name="line-421"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_float</span>
<a name="line-422"></a>
<a name="line-423"></a><a name="optionType_float"></a><span class='hs-comment'>-- | Store an option as a @'Float'@. The option value must be a number. Due to</span>
<a name="line-424"></a><span class='hs-comment'>-- the imprecision of floating-point math, the stored value might not exactly</span>
<a name="line-425"></a><span class='hs-comment'>-- match the user's input. If the user's input is out of range for the</span>
<a name="line-426"></a><span class='hs-comment'>-- @'Float'@ type, it will be stored as @Infinity@ or @-Infinity@.</span>
<a name="line-427"></a><span class='hs-definition'>optionType_float</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Float</span>
<a name="line-428"></a><span class='hs-definition'>optionType_float</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType</span> <span class='hs-str'>"float32"</span> <span class='hs-num'>0</span> <span class='hs-varid'>parseFloat</span> <span class='hs-varid'>show</span>
<a name="line-429"></a>
<a name="line-430"></a><a name="instance%20SimpleOptionType%20Double"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-conid'>Double</span> <span class='hs-keyword'>where</span>
<a name="line-431"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_double</span>
<a name="line-432"></a>
<a name="line-433"></a><a name="optionType_double"></a><span class='hs-comment'>-- | Store an option as a @'Double'@. The option value must be a number. Due to</span>
<a name="line-434"></a><span class='hs-comment'>-- the imprecision of floating-point math, the stored value might not exactly</span>
<a name="line-435"></a><span class='hs-comment'>-- match the user's input. If the user's input is out of range for the</span>
<a name="line-436"></a><span class='hs-comment'>-- @'Double'@ type, it will be stored as @Infinity@ or @-Infinity@.</span>
<a name="line-437"></a><span class='hs-definition'>optionType_double</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-conid'>Double</span>
<a name="line-438"></a><span class='hs-definition'>optionType_double</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType</span> <span class='hs-str'>"float64"</span> <span class='hs-num'>0</span> <span class='hs-varid'>parseFloat</span> <span class='hs-varid'>show</span>
<a name="line-439"></a>
<a name="line-440"></a><a name="parseFloat"></a><span class='hs-definition'>parseFloat</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Read</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>a</span>
<a name="line-441"></a><span class='hs-definition'>parseFloat</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reads</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-442"></a>	<span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-str'>""</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>x</span>
<a name="line-443"></a>	<span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>s</span> <span class='hs-varop'>++</span> <span class='hs-str'>" is not a number."</span><span class='hs-layout'>)</span>
<a name="line-444"></a>
<a name="line-445"></a><a name="instance%20SimpleOptionType%20(Maybe%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>SimpleOptionType</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-keyword'>where</span>
<a name="line-446"></a>	<span class='hs-varid'>simpleOptionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType_maybe</span> <span class='hs-varid'>simpleOptionType</span>
<a name="line-447"></a>
<a name="line-448"></a><a name="optionType_maybe"></a><span class='hs-comment'>-- | Store an option as a @'Maybe'@ of another type. The value will be</span>
<a name="line-449"></a><span class='hs-comment'>-- @Nothing@ if the option is set to an empty string.</span>
<a name="line-450"></a><span class='hs-definition'>optionType_maybe</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OptionType</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-451"></a><span class='hs-definition'>optionType_maybe</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybeT</span> <span class='hs-layout'>{</span> <span class='hs-varid'>optionTypeUnary</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unary</span> <span class='hs-layout'>}</span> <span class='hs-keyword'>where</span>
<a name="line-452"></a>	<span class='hs-varid'>maybeT</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType</span> <span class='hs-varid'>name</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseMaybe</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>showMaybe</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-453"></a>	<span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"maybe&lt;"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>optionTypeName</span> <span class='hs-varid'>t</span> <span class='hs-varop'>++</span> <span class='hs-str'>"&gt;"</span>
<a name="line-454"></a>	<span class='hs-varid'>unary</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>optionTypeUnary</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>of</span>
<a name="line-455"></a>		<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Nothing</span>
<a name="line-456"></a>		<span class='hs-conid'>Just</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>val</span><span class='hs-layout'>)</span>
<a name="line-457"></a>
<a name="line-458"></a><a name="parseMaybe"></a><span class='hs-definition'>parseMaybe</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>val</span><span class='hs-layout'>)</span>
<a name="line-459"></a><span class='hs-definition'>parseMaybe</span> <span class='hs-varid'>t</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-460"></a>	<span class='hs-str'>""</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-conid'>Nothing</span>
<a name="line-461"></a>	<span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>optionTypeParse</span> <span class='hs-varid'>t</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-462"></a>		<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-463"></a>		<span class='hs-conid'>Right</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-464"></a>
<a name="line-465"></a><a name="showMaybe"></a><span class='hs-definition'>showMaybe</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span>
<a name="line-466"></a><span class='hs-definition'>showMaybe</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
<a name="line-467"></a><span class='hs-definition'>showMaybe</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeShow</span> <span class='hs-varid'>t</span> <span class='hs-varid'>x</span>
<a name="line-468"></a>
<a name="line-469"></a><a name="optionType_set"></a><span class='hs-comment'>-- | Store an option as a @'Set.Set'@, using another option type for the</span>
<a name="line-470"></a><span class='hs-comment'>-- elements. The separator should be a character that will not occur within</span>
<a name="line-471"></a><span class='hs-comment'>-- the values, such as a comma or semicolon.</span>
<a name="line-472"></a><span class='hs-comment'>--</span>
<a name="line-473"></a><span class='hs-comment'>-- Duplicate elements in the input are permitted.</span>
<a name="line-474"></a><span class='hs-definition'>optionType_set</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>a</span>
<a name="line-475"></a>               <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>Char</span> <span class='hs-comment'>-- ^ Element separator</span>
<a name="line-476"></a>               <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ Element type</span>
<a name="line-477"></a>               <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OptionType</span> <span class='hs-layout'>(</span><span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-478"></a><span class='hs-definition'>optionType_set</span> <span class='hs-varid'>sep</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType</span> <span class='hs-varid'>name</span> <span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <span class='hs-varid'>parseSet</span> <span class='hs-varid'>showSet</span> <span class='hs-keyword'>where</span>
<a name="line-479"></a>	<span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"set&lt;"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>optionTypeName</span> <span class='hs-varid'>t</span> <span class='hs-varop'>++</span> <span class='hs-str'>"&gt;"</span>
<a name="line-480"></a>	<span class='hs-varid'>parseSet</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>parseList</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionTypeParse</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>split</span> <span class='hs-varid'>sep</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-481"></a>		<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-482"></a>		<span class='hs-conid'>Right</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-483"></a>	<span class='hs-varid'>showSet</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>intercalate</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>sep</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionTypeShow</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-varid'>toList</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-484"></a>
<a name="line-485"></a><a name="optionType_map"></a><span class='hs-comment'>-- | Store an option as a 'Map.Map', using other option types for the keys and</span>
<a name="line-486"></a><span class='hs-comment'>-- values.</span>
<a name="line-487"></a><span class='hs-comment'>--</span>
<a name="line-488"></a><span class='hs-comment'>-- The item separator is used to separate key/value pairs from eachother. It</span>
<a name="line-489"></a><span class='hs-comment'>-- should be a character that will not occur within either the keys or values.</span>
<a name="line-490"></a><span class='hs-comment'>--</span>
<a name="line-491"></a><span class='hs-comment'>-- The value separator is used to separate the key from the value. It should</span>
<a name="line-492"></a><span class='hs-comment'>-- be a character that will not occur within the keys. It may occur within the</span>
<a name="line-493"></a><span class='hs-comment'>-- values.</span>
<a name="line-494"></a><span class='hs-comment'>--</span>
<a name="line-495"></a><span class='hs-comment'>-- Duplicate keys in the input are permitted. The final value for each key is</span>
<a name="line-496"></a><span class='hs-comment'>-- stored.</span>
<a name="line-497"></a><span class='hs-definition'>optionType_map</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>k</span>
<a name="line-498"></a>               <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>Char</span> <span class='hs-comment'>-- ^ Item separator</span>
<a name="line-499"></a>               <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Char</span> <span class='hs-comment'>-- ^ Key/Value separator</span>
<a name="line-500"></a>               <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>k</span> <span class='hs-comment'>-- ^ Key type</span>
<a name="line-501"></a>               <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>v</span> <span class='hs-comment'>-- ^ Value type</span>
<a name="line-502"></a>               <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OptionType</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-varid'>k</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span>
<a name="line-503"></a><span class='hs-definition'>optionType_map</span> <span class='hs-varid'>itemSep</span> <span class='hs-varid'>keySep</span> <span class='hs-varid'>kt</span> <span class='hs-varid'>vt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType</span> <span class='hs-varid'>name</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <span class='hs-varid'>parser</span> <span class='hs-varid'>showMap</span> <span class='hs-keyword'>where</span>
<a name="line-504"></a>	<span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"map&lt;"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>optionTypeName</span> <span class='hs-varid'>kt</span> <span class='hs-varop'>++</span> <span class='hs-str'>","</span> <span class='hs-varop'>++</span> <span class='hs-varid'>optionTypeName</span> <span class='hs-varid'>vt</span> <span class='hs-varop'>++</span> <span class='hs-str'>"&gt;"</span>
<a name="line-505"></a>	<span class='hs-varid'>parser</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseMap</span> <span class='hs-varid'>keySep</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionTypeParse</span> <span class='hs-varid'>kt</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionTypeParse</span> <span class='hs-varid'>vt</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>split</span> <span class='hs-varid'>itemSep</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-506"></a>	<span class='hs-varid'>showMap</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>intercalate</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>itemSep</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>showItem</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>toList</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-507"></a>	<span class='hs-varid'>showItem</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span><span class='hs-layout'>,</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeShow</span> <span class='hs-varid'>kt</span> <span class='hs-varid'>k</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>keySep</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>++</span> <span class='hs-varid'>optionTypeShow</span> <span class='hs-varid'>vt</span> <span class='hs-varid'>v</span>
<a name="line-508"></a>
<a name="line-509"></a><a name="parseList"></a><span class='hs-definition'>parseList</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-510"></a><span class='hs-definition'>parseList</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-keyword'>where</span>
<a name="line-511"></a>	<span class='hs-varid'>loop</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Right</span> <span class='hs-conid'>[]</span>
<a name="line-512"></a>	<span class='hs-varid'>loop</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-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>p</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-513"></a>		<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-514"></a>		<span class='hs-conid'>Right</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>of</span>
<a name="line-515"></a>			<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-516"></a>			<span class='hs-conid'>Right</span> <span class='hs-varid'>vs</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span><span class='hs-conop'>:</span><span class='hs-varid'>vs</span><span class='hs-layout'>)</span>
<a name="line-517"></a>
<a name="line-518"></a><a name="parseMap"></a><span class='hs-definition'>parseMap</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-varid'>k</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span>
<a name="line-519"></a><span class='hs-definition'>parseMap</span> <span class='hs-varid'>keySep</span> <span class='hs-varid'>pKey</span> <span class='hs-varid'>pVal</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parsed</span> <span class='hs-keyword'>where</span>
<a name="line-520"></a>	<span class='hs-varid'>parsed</span> <span class='hs-varid'>strs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>parseList</span> <span class='hs-varid'>pItem</span> <span class='hs-varid'>strs</span> <span class='hs-keyword'>of</span>
<a name="line-521"></a>		<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-522"></a>		<span class='hs-conid'>Right</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-523"></a>	<span class='hs-varid'>pItem</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>break</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span> <span class='hs-varid'>keySep</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-524"></a>		<span class='hs-layout'>(</span><span class='hs-varid'>sKey</span><span class='hs-layout'>,</span> <span class='hs-varid'>valAndSep</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>valAndSep</span> <span class='hs-keyword'>of</span>
<a name="line-525"></a>			<span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-str'>"Map item "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>s</span> <span class='hs-varop'>++</span> <span class='hs-str'>" has no value."</span><span class='hs-layout'>)</span>
<a name="line-526"></a>			<span class='hs-keyword'>_</span> <span class='hs-conop'>:</span> <span class='hs-varid'>sVal</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>pKey</span> <span class='hs-varid'>sKey</span> <span class='hs-keyword'>of</span>
<a name="line-527"></a>				<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-528"></a>				<span class='hs-conid'>Right</span> <span class='hs-varid'>key</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>pVal</span> <span class='hs-varid'>sVal</span> <span class='hs-keyword'>of</span>
<a name="line-529"></a>					<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-530"></a>					<span class='hs-conid'>Right</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>key</span><span class='hs-layout'>,</span> <span class='hs-varid'>val</span><span class='hs-layout'>)</span>
<a name="line-531"></a>
<a name="line-532"></a><a name="split"></a><span class='hs-definition'>split</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-533"></a><span class='hs-definition'>split</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-534"></a><span class='hs-definition'>split</span> <span class='hs-varid'>sep</span> <span class='hs-varid'>s0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>s0</span> <span class='hs-keyword'>where</span>
<a name="line-535"></a>	<span class='hs-varid'>loop</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span>
<a name="line-536"></a>		<span class='hs-layout'>(</span><span class='hs-varid'>chunk</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'>break</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span> <span class='hs-varid'>sep</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-537"></a>		<span class='hs-varid'>cont</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>chunk</span> <span class='hs-conop'>:</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>tail</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-538"></a>		<span class='hs-keyword'>in</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>rest</span> <span class='hs-keyword'>then</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>chunk</span><span class='hs-keyglyph'>]</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>cont</span>
<a name="line-539"></a>
<a name="line-540"></a><a name="optionType_list"></a><span class='hs-comment'>-- | Store an option as a list, using another option type for the elements.</span>
<a name="line-541"></a><span class='hs-comment'>-- The separator should be a character that will not occur within the values,</span>
<a name="line-542"></a><span class='hs-comment'>-- such as a comma or semicolon.</span>
<a name="line-543"></a><span class='hs-definition'>optionType_list</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-comment'>-- ^ Element separator</span>
<a name="line-544"></a>                <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ Element type</span>
<a name="line-545"></a>                <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OptionType</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-546"></a><span class='hs-definition'>optionType_list</span> <span class='hs-varid'>sep</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType</span> <span class='hs-varid'>name</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>parser</span> <span class='hs-varid'>shower</span> <span class='hs-keyword'>where</span>
<a name="line-547"></a>	<span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span>  <span class='hs-str'>"list&lt;"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>optionTypeName</span> <span class='hs-varid'>t</span> <span class='hs-varop'>++</span> <span class='hs-str'>"&gt;"</span>
<a name="line-548"></a>	<span class='hs-varid'>parser</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseList</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionTypeParse</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>split</span> <span class='hs-varid'>sep</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-549"></a>	<span class='hs-varid'>shower</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>intercalate</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>sep</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionTypeShow</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-550"></a>
<a name="line-551"></a><a name="optionType_enum"></a><span class='hs-comment'>-- | Store an option as one of a set of possible values. The type must be a</span>
<a name="line-552"></a><span class='hs-comment'>-- bounded enumeration, and the type's 'Show' instance will be used to</span>
<a name="line-553"></a><span class='hs-comment'>-- implement the parser.</span>
<a name="line-554"></a><span class='hs-comment'>--</span>
<a name="line-555"></a><span class='hs-comment'>-- This is a simplistic implementation, useful for quick scripts. Users with</span>
<a name="line-556"></a><span class='hs-comment'>-- more complex requirements for enum parsing are encouraged to define their</span>
<a name="line-557"></a><span class='hs-comment'>-- own option types using 'optionType'.</span>
<a name="line-558"></a><span class='hs-comment'>--</span>
<a name="line-559"></a><span class='hs-comment'>-- @</span>
<a name="line-560"></a><span class='hs-comment'>--data Action = Hello | Goodbye</span>
<a name="line-561"></a><span class='hs-comment'>--    deriving (Bounded, Enum, Show)</span>
<a name="line-562"></a><span class='hs-comment'>--</span>
<a name="line-563"></a><span class='hs-comment'>--data MainOptions = MainOptions { optAction :: Action }</span>
<a name="line-564"></a><span class='hs-comment'>--</span>
<a name="line-565"></a><span class='hs-comment'>--instance 'Options' MainOptions where</span>
<a name="line-566"></a><span class='hs-comment'>--    'defineOptions' = pure MainOptions</span>
<a name="line-567"></a><span class='hs-comment'>--        \&lt;*\&gt; 'defineOption' (optionType_enum \"action\") (\\o -&gt; o</span>
<a name="line-568"></a><span class='hs-comment'>--            { 'optionLongFlags' = [\"action\"]</span>
<a name="line-569"></a><span class='hs-comment'>--            , 'optionDefault' = Hello</span>
<a name="line-570"></a><span class='hs-comment'>--            })</span>
<a name="line-571"></a><span class='hs-comment'>--</span>
<a name="line-572"></a><span class='hs-comment'>--main = 'runCommand' $ \\opts args -&gt; do</span>
<a name="line-573"></a><span class='hs-comment'>--    putStrLn (\"Running action \" ++ show (optAction opts))</span>
<a name="line-574"></a><span class='hs-comment'>-- @</span>
<a name="line-575"></a><span class='hs-comment'>--</span>
<a name="line-576"></a><span class='hs-comment'>-- &gt;$ ./app</span>
<a name="line-577"></a><span class='hs-comment'>-- &gt;Running action Hello</span>
<a name="line-578"></a><span class='hs-comment'>-- &gt;$ ./app --action=Goodbye</span>
<a name="line-579"></a><span class='hs-comment'>-- &gt;Running action Goodbye</span>
<a name="line-580"></a><span class='hs-definition'>optionType_enum</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Bounded</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Enum</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-581"></a>                <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ Option type name</span>
<a name="line-582"></a>                <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>a</span>
<a name="line-583"></a><span class='hs-definition'>optionType_enum</span> <span class='hs-varid'>tName</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionType</span> <span class='hs-varid'>tName</span> <span class='hs-varid'>minBound</span> <span class='hs-varid'>parseEnum</span> <span class='hs-varid'>show</span> <span class='hs-keyword'>where</span>
<a name="line-584"></a>	<span class='hs-varid'>values</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>enumFrom</span> <span class='hs-varid'>minBound</span><span class='hs-keyglyph'>]</span>
<a name="line-585"></a>	<span class='hs-varid'>setString</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"{"</span> <span class='hs-varop'>++</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-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>keys</span> <span class='hs-varid'>values</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-str'>"}"</span>
<a name="line-586"></a>	<span class='hs-varid'>parseEnum</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>s</span> <span class='hs-varid'>values</span> <span class='hs-keyword'>of</span>
<a name="line-587"></a>		<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>s</span> <span class='hs-varop'>++</span> <span class='hs-str'>" is not in "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>setString</span> <span class='hs-varop'>++</span> <span class='hs-str'>"."</span><span class='hs-layout'>)</span>
<a name="line-588"></a>		<span class='hs-conid'>Just</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>x</span>
<a name="line-589"></a>
<a name="line-590"></a><a name="simpleOption"></a><span class='hs-comment'>-- | Defines a new option in the current options type.</span>
<a name="line-591"></a><span class='hs-comment'>--</span>
<a name="line-592"></a><span class='hs-definition'>simpleOption</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SimpleOptionType</span> <span class='hs-varid'>a</span>
<a name="line-593"></a>             <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- long flag</span>
<a name="line-594"></a>             <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- default value</span>
<a name="line-595"></a>             <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- description</span>
<a name="line-596"></a>             <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DefineOptions</span> <span class='hs-varid'>a</span>
<a name="line-597"></a><span class='hs-definition'>simpleOption</span> <span class='hs-varid'>flag</span> <span class='hs-varid'>def</span> <span class='hs-varid'>desc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defineOption</span> <span class='hs-varid'>simpleOptionType</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>o</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>o</span>
<a name="line-598"></a>	<span class='hs-layout'>{</span> <span class='hs-varid'>optionLongFlags</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>flag</span><span class='hs-keyglyph'>]</span>
<a name="line-599"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionDefault</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>def</span>
<a name="line-600"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionDescription</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>desc</span>
<a name="line-601"></a>	<span class='hs-layout'>}</span><span class='hs-layout'>)</span>
<a name="line-602"></a>
<a name="line-603"></a><a name="defineOption"></a><span class='hs-comment'>-- | Defines a new option in the current options type.</span>
<a name="line-604"></a><span class='hs-comment'>--</span>
<a name="line-605"></a><span class='hs-comment'>-- All options must have one or more /flags/. Options may also have a</span>
<a name="line-606"></a><span class='hs-comment'>-- default value, a description, and a group.</span>
<a name="line-607"></a><span class='hs-comment'>--</span>
<a name="line-608"></a><span class='hs-comment'>-- The /flags/ are how the user specifies an option on the command line. Flags</span>
<a name="line-609"></a><span class='hs-comment'>-- may be /short/ or /long/. See 'optionShortFlags' and 'optionLongFlags' for</span>
<a name="line-610"></a><span class='hs-comment'>-- details.</span>
<a name="line-611"></a><span class='hs-comment'>--</span>
<a name="line-612"></a><span class='hs-comment'>-- @</span>
<a name="line-613"></a><span class='hs-comment'>--'defineOption' 'optionType_word16' (\\o -&gt; o</span>
<a name="line-614"></a><span class='hs-comment'>--    { 'optionLongFlags' = [\"port\"]</span>
<a name="line-615"></a><span class='hs-comment'>--    , 'optionDefault' = 80</span>
<a name="line-616"></a><span class='hs-comment'>--    })</span>
<a name="line-617"></a><span class='hs-comment'>-- @</span>
<a name="line-618"></a><span class='hs-definition'>defineOption</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionType</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>Option</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Option</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DefineOptions</span> <span class='hs-varid'>a</span>
<a name="line-619"></a><span class='hs-definition'>defineOption</span> <span class='hs-varid'>t</span> <span class='hs-varid'>fn</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DefineOptions</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionDefault</span> <span class='hs-varid'>opt</span><span class='hs-layout'>)</span> <span class='hs-varid'>getInfo</span> <span class='hs-varid'>parser</span> <span class='hs-keyword'>where</span>
<a name="line-620"></a>	<span class='hs-varid'>opt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fn</span> <span class='hs-layout'>(</span><span class='hs-conid'>Option</span>
<a name="line-621"></a>		<span class='hs-layout'>{</span> <span class='hs-varid'>optionShortFlags</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-622"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionLongFlags</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-623"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionDefault</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeDefault</span> <span class='hs-varid'>t</span>
<a name="line-624"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionDescription</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
<a name="line-625"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionGroup</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-626"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionLocation</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-627"></a>		<span class='hs-layout'>}</span><span class='hs-layout'>)</span>
<a name="line-628"></a>	
<a name="line-629"></a>	<span class='hs-varid'>getInfo</span> <span class='hs-varid'>key</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>key</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptionInfo</span>
<a name="line-630"></a>		<span class='hs-layout'>{</span> <span class='hs-varid'>optionInfoKey</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>OptionKeyGenerated</span> <span class='hs-varid'>key</span>
<a name="line-631"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionInfoShortFlags</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionShortFlags</span> <span class='hs-varid'>opt</span>
<a name="line-632"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionInfoLongFlags</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionLongFlags</span> <span class='hs-varid'>opt</span>
<a name="line-633"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionInfoDefault</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeShow</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionDefault</span> <span class='hs-varid'>opt</span><span class='hs-layout'>)</span>
<a name="line-634"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionInfoDescription</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionDescription</span> <span class='hs-varid'>opt</span>
<a name="line-635"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionInfoGroup</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionGroup</span> <span class='hs-varid'>opt</span>
<a name="line-636"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionInfoLocation</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionLocation</span> <span class='hs-varid'>opt</span>
<a name="line-637"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionInfoTypeName</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionTypeName</span> <span class='hs-varid'>t</span>
<a name="line-638"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionInfoUnary</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isJust</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionTypeUnary</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-639"></a>		<span class='hs-layout'>,</span> <span class='hs-varid'>optionInfoUnaryOnly</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-640"></a>		<span class='hs-layout'>}</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-641"></a>	
<a name="line-642"></a>	<span class='hs-comment'>-- parseToken :: Token -&gt; Either String val</span>
<a name="line-643"></a>	<span class='hs-varid'>parseToken</span> <span class='hs-varid'>tok</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>tok</span> <span class='hs-keyword'>of</span>
<a name="line-644"></a>		<span class='hs-conid'>TokenUnary</span> <span class='hs-varid'>flagName</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>optionTypeUnary</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>of</span>
<a name="line-645"></a>			<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-str'>"The flag "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>flagName</span> <span class='hs-varop'>++</span> <span class='hs-str'>" requires an argument."</span><span class='hs-layout'>)</span>
<a name="line-646"></a>			<span class='hs-conid'>Just</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>val</span>
<a name="line-647"></a>		<span class='hs-conid'>Token</span> <span class='hs-varid'>flagName</span> <span class='hs-varid'>rawValue</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>optionTypeParse</span> <span class='hs-varid'>t</span> <span class='hs-varid'>rawValue</span> <span class='hs-keyword'>of</span>
<a name="line-648"></a>			<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-str'>"Value for flag "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>flagName</span> <span class='hs-varop'>++</span> <span class='hs-str'>" is invalid: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span>
<a name="line-649"></a>			<span class='hs-conid'>Right</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>val</span>
<a name="line-650"></a>	
<a name="line-651"></a>	<span class='hs-varid'>parser</span> <span class='hs-varid'>key</span> <span class='hs-varid'>tokens</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-layout'>(</span><span class='hs-conid'>OptionKeyGenerated</span> <span class='hs-varid'>key</span><span class='hs-layout'>)</span> <span class='hs-varid'>tokens</span> <span class='hs-keyword'>of</span>
<a name="line-652"></a>		<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>key</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>optionDefault</span> <span class='hs-varid'>opt</span><span class='hs-layout'>)</span>
<a name="line-653"></a>		<span class='hs-conid'>Just</span> <span class='hs-varid'>toks</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>toks</span> <span class='hs-keyword'>of</span>
<a name="line-654"></a>			<span class='hs-comment'>-- shouldn't happen, but lets do something graceful anyway.</span>
<a name="line-655"></a>			<span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>key</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>optionDefault</span> <span class='hs-varid'>opt</span><span class='hs-layout'>)</span>
<a name="line-656"></a>			<span class='hs-keyglyph'>[</span><span class='hs-varid'>tok</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>parseToken</span> <span class='hs-varid'>tok</span> <span class='hs-keyword'>of</span>
<a name="line-657"></a>				<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-658"></a>				<span class='hs-conid'>Right</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>key</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>val</span><span class='hs-layout'>)</span>
<a name="line-659"></a>			<span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>optionTypeMerge</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>of</span>
<a name="line-660"></a>				<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-str'>"Multiple values for flag: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>showMultipleFlagValues</span> <span class='hs-varid'>toks</span><span class='hs-layout'>)</span>
<a name="line-661"></a>				<span class='hs-conid'>Just</span> <span class='hs-varid'>appendFn</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>mapEither</span> <span class='hs-varid'>parseToken</span> <span class='hs-varid'>toks</span> <span class='hs-keyword'>of</span>
<a name="line-662"></a>					<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-663"></a>					<span class='hs-conid'>Right</span> <span class='hs-varid'>vals</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>key</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>appendFn</span> <span class='hs-varid'>vals</span><span class='hs-layout'>)</span>
<a name="line-664"></a>
<a name="line-665"></a><a name="showMultipleFlagValues"></a><span class='hs-definition'>showMultipleFlagValues</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Token</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span>
<a name="line-666"></a><span class='hs-definition'>showMultipleFlagValues</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>intercalate</span> <span class='hs-str'>" "</span> <span class='hs-varop'>.</span> <span class='hs-varid'>map</span> <span class='hs-varid'>showToken</span> <span class='hs-keyword'>where</span>
<a name="line-667"></a>	<span class='hs-varid'>showToken</span> <span class='hs-layout'>(</span><span class='hs-conid'>TokenUnary</span> <span class='hs-varid'>flagName</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flagName</span>
<a name="line-668"></a>	<span class='hs-varid'>showToken</span> <span class='hs-layout'>(</span><span class='hs-conid'>Token</span> <span class='hs-varid'>flagName</span> <span class='hs-varid'>rawValue</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>flagName</span> <span class='hs-varop'>++</span> <span class='hs-str'>"="</span> <span class='hs-varop'>++</span> <span class='hs-varid'>rawValue</span><span class='hs-layout'>)</span>
<a name="line-669"></a>
<a name="line-670"></a><a name="Option"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Option</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Option</span>
<a name="line-671"></a>	<span class='hs-layout'>{</span>
<a name="line-672"></a>	<span class='hs-comment'>-- | Short flags are a single character. When entered by a user,</span>
<a name="line-673"></a>	<span class='hs-comment'>-- they are preceded by a dash and possibly other short flags.</span>
<a name="line-674"></a>	<span class='hs-comment'>--</span>
<a name="line-675"></a>	<span class='hs-comment'>-- Short flags must be a letter or a number.</span>
<a name="line-676"></a>	<span class='hs-comment'>--</span>
<a name="line-677"></a>	<span class='hs-comment'>-- Example: An option with @optionShortFlags = [\'p\']@ may be set using:</span>
<a name="line-678"></a>	<span class='hs-comment'>--</span>
<a name="line-679"></a>	<span class='hs-comment'>-- &gt;$ ./app -p 443</span>
<a name="line-680"></a>	<span class='hs-comment'>-- &gt;$ ./app -p443</span>
<a name="line-681"></a>	  <span class='hs-varid'>optionShortFlags</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span>
<a name="line-682"></a>	
<a name="line-683"></a>	<span class='hs-comment'>-- | Long flags are multiple characters. When entered by a user, they</span>
<a name="line-684"></a>	<span class='hs-comment'>-- are preceded by two dashes.</span>
<a name="line-685"></a>	<span class='hs-comment'>--</span>
<a name="line-686"></a>	<span class='hs-comment'>-- Long flags may contain letters, numbers, @\'-\'@, and @\'_\'@.</span>
<a name="line-687"></a>	<span class='hs-comment'>--</span>
<a name="line-688"></a>	<span class='hs-comment'>-- Example: An option with @optionLongFlags = [\"port\"]@ may be set using:</span>
<a name="line-689"></a>	<span class='hs-comment'>--</span>
<a name="line-690"></a>	<span class='hs-comment'>-- &gt;$ ./app --port 443</span>
<a name="line-691"></a>	<span class='hs-comment'>-- &gt;$ ./app --port=443</span>
<a name="line-692"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionLongFlags</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-693"></a>	
<a name="line-694"></a>	<span class='hs-comment'>-- | Options may have a default value. This will be parsed as if the</span>
<a name="line-695"></a>	<span class='hs-comment'>-- user had entered it on the command line.</span>
<a name="line-696"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionDefault</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span>
<a name="line-697"></a>	
<a name="line-698"></a>	<span class='hs-comment'>-- | An option's description is used with the default implementation</span>
<a name="line-699"></a>	<span class='hs-comment'>-- of @--help@. It should be a short string describing what the option</span>
<a name="line-700"></a>	<span class='hs-comment'>-- does.</span>
<a name="line-701"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionDescription</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-702"></a>	
<a name="line-703"></a>	<span class='hs-comment'>-- | Which group the option is in. See the \"Option groups\" section</span>
<a name="line-704"></a>	<span class='hs-comment'>-- for details.</span>
<a name="line-705"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionGroup</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Group</span>
<a name="line-706"></a>	
<a name="line-707"></a>	<span class='hs-comment'>-- | TODO docs</span>
<a name="line-708"></a>	<span class='hs-layout'>,</span> <span class='hs-varid'>optionLocation</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Location</span>
<a name="line-709"></a>	<span class='hs-layout'>}</span>
<a name="line-710"></a>
<a name="line-711"></a><a name="validateOptionDefs"></a><span class='hs-definition'>validateOptionDefs</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptionInfo</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</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'>OptionInfo</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-conid'>OptionDefinitions</span>
<a name="line-712"></a><span class='hs-definition'>validateOptionDefs</span> <span class='hs-varid'>cmdInfos</span> <span class='hs-varid'>subInfos</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runIdentity</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runErrorT</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-713"></a>	<span class='hs-comment'>-- All subcommands have unique names.</span>
<a name="line-714"></a>	<span class='hs-keyword'>let</span> <span class='hs-varid'>subcmdNames</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>subInfos</span>
<a name="line-715"></a>	<span class='hs-keyword'>if</span> <span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-varid'>size</span> <span class='hs-layout'>(</span><span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-varid'>subcmdNames</span><span class='hs-layout'>)</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>subcmdNames</span>
<a name="line-716"></a>		<span class='hs-comment'>-- TODO: the error should mention which subcommand names are duplicated</span>
<a name="line-717"></a>		<span class='hs-keyword'>then</span> <span class='hs-varid'>throwError</span> <span class='hs-str'>"Multiple subcommands exist with the same name."</span>
<a name="line-718"></a>		<span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-719"></a>	
<a name="line-720"></a>	<span class='hs-comment'>-- Each option defines at least one short or long flag.</span>
<a name="line-721"></a>	<span class='hs-keyword'>let</span> <span class='hs-varid'>allOptInfos</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cmdInfos</span> <span class='hs-varop'>++</span> <span class='hs-varid'>concat</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>infos</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>infos</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>subInfos</span><span class='hs-keyglyph'>]</span>
<a name="line-722"></a>	<span class='hs-keyword'>case</span> <span class='hs-varid'>mapEither</span> <span class='hs-varid'>optValidFlags</span> <span class='hs-varid'>allOptInfos</span> <span class='hs-keyword'>of</span>
<a name="line-723"></a>		<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>throwError</span> <span class='hs-varid'>err</span>
<a name="line-724"></a>		<span class='hs-conid'>Right</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-725"></a>	
<a name="line-726"></a>	<span class='hs-comment'>-- There are no duplicate short or long flags, unless:</span>
<a name="line-727"></a>	<span class='hs-comment'>-- The flags are defined in separate subcommands.</span>
<a name="line-728"></a>	<span class='hs-comment'>-- The flags have identical OptionInfos (aside from keys)</span>
<a name="line-729"></a>	<span class='hs-varid'>cmdDeDupedFlags</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>checkNoDuplicateFlags</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <span class='hs-varid'>cmdInfos</span>
<a name="line-730"></a>	<span class='hs-varid'>forM_</span> <span class='hs-varid'>subInfos</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>subInfo</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>checkNoDuplicateFlags</span> <span class='hs-varid'>cmdDeDupedFlags</span> <span class='hs-layout'>(</span><span class='hs-varid'>snd</span> <span class='hs-varid'>subInfo</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-731"></a>	
<a name="line-732"></a>	<span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>addHelpFlags</span> <span class='hs-layout'>(</span><span class='hs-conid'>OptionDefinitions</span> <span class='hs-varid'>cmdInfos</span> <span class='hs-varid'>subInfos</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-733"></a>
<a name="line-734"></a><a name="optValidFlags"></a><span class='hs-definition'>optValidFlags</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionInfo</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-conid'>()</span>
<a name="line-735"></a><span class='hs-definition'>optValidFlags</span> <span class='hs-varid'>info</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionInfoShortFlags</span> <span class='hs-varid'>info</span><span class='hs-layout'>)</span> <span class='hs-varop'>&amp;&amp;</span> <span class='hs-varid'>null</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionInfoLongFlags</span> <span class='hs-varid'>info</span><span class='hs-layout'>)</span>
<a name="line-736"></a>	<span class='hs-keyword'>then</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>optionInfoLocation</span> <span class='hs-varid'>info</span> <span class='hs-keyword'>of</span>
<a name="line-737"></a>		<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-str'>"Option with description "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionInfoDescription</span> <span class='hs-varid'>info</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-str'>" has no flags."</span><span class='hs-layout'>)</span>
<a name="line-738"></a>		<span class='hs-conid'>Just</span> <span class='hs-varid'>loc</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-str'>"Option with description "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionInfoDescription</span> <span class='hs-varid'>info</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-str'>" at "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>locationFilename</span> <span class='hs-varid'>loc</span> <span class='hs-varop'>++</span> <span class='hs-str'>":"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>locationLine</span> <span class='hs-varid'>loc</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-str'>" has no flags."</span><span class='hs-layout'>)</span>
<a name="line-739"></a>	<span class='hs-comment'>-- TODO: All short or long flags have a reasonable name.</span>
<a name="line-740"></a>	<span class='hs-keyword'>else</span> <span class='hs-conid'>Right</span> <span class='hs-conid'>()</span>
<a name="line-741"></a>
<a name="line-742"></a><a name="DeDupFlag"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DeDupFlag</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DeDupShort</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>DeDupLong</span> <span class='hs-conid'>String</span>
<a name="line-743"></a>	<span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-744"></a>
<a name="line-745"></a><a name="checkNoDuplicateFlags"></a><span class='hs-definition'>checkNoDuplicateFlags</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-conid'>DeDupFlag</span> <span class='hs-conid'>OptionInfo</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OptionInfo</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ErrorT</span> <span class='hs-conid'>String</span> <span class='hs-conid'>Identity</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-conid'>DeDupFlag</span> <span class='hs-conid'>OptionInfo</span><span class='hs-layout'>)</span>
<a name="line-746"></a><span class='hs-definition'>checkNoDuplicateFlags</span> <span class='hs-varid'>checked</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>checked</span>
<a name="line-747"></a><span class='hs-definition'>checkNoDuplicateFlags</span> <span class='hs-varid'>checked</span> <span class='hs-layout'>(</span><span class='hs-varid'>info</span><span class='hs-conop'>:</span><span class='hs-varid'>infos</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-748"></a>	<span class='hs-keyword'>let</span> <span class='hs-varid'>mappedShort</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-conid'>DeDupShort</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionInfoShortFlags</span> <span class='hs-varid'>info</span><span class='hs-layout'>)</span>
<a name="line-749"></a>	<span class='hs-keyword'>let</span> <span class='hs-varid'>mappedLong</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-conid'>DeDupLong</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionInfoLongFlags</span> <span class='hs-varid'>info</span><span class='hs-layout'>)</span>
<a name="line-750"></a>	<span class='hs-keyword'>let</span> <span class='hs-varid'>mappedFlags</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mappedShort</span> <span class='hs-varop'>++</span> <span class='hs-varid'>mappedLong</span>
<a name="line-751"></a>	<span class='hs-varid'>forM_</span> <span class='hs-varid'>mappedFlags</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>mapKey</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>mapKey</span> <span class='hs-varid'>checked</span> <span class='hs-keyword'>of</span>
<a name="line-752"></a>		<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-753"></a>		<span class='hs-conid'>Just</span> <span class='hs-varid'>prevInfo</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>eqIgnoringKey</span> <span class='hs-varid'>info</span> <span class='hs-varid'>prevInfo</span>
<a name="line-754"></a>			<span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-755"></a>			<span class='hs-keyword'>else</span> <span class='hs-keyword'>let</span>
<a name="line-756"></a>				<span class='hs-varid'>flagName</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>mapKey</span> <span class='hs-keyword'>of</span>
<a name="line-757"></a>					<span class='hs-conid'>DeDupShort</span> <span class='hs-varid'>flag</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-chr'>'-'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>flag</span> <span class='hs-conop'>:</span> <span class='hs-conid'>[]</span>
<a name="line-758"></a>					<span class='hs-conid'>DeDupLong</span> <span class='hs-varid'>long</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-str'>"--"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>long</span>
<a name="line-759"></a>				<span class='hs-keyword'>in</span> <span class='hs-varid'>throwError</span> <span class='hs-layout'>(</span><span class='hs-str'>"Duplicate option flag "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>flagName</span> <span class='hs-varop'>++</span> <span class='hs-str'>"."</span><span class='hs-layout'>)</span>
<a name="line-760"></a>	
<a name="line-761"></a>	<span class='hs-keyword'>let</span> <span class='hs-varid'>infoMap</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>f</span><span class='hs-layout'>,</span> <span class='hs-varid'>info</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>mappedFlags</span><span class='hs-keyglyph'>]</span>
<a name="line-762"></a>	<span class='hs-varid'>checkNoDuplicateFlags</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>union</span> <span class='hs-varid'>checked</span> <span class='hs-varid'>infoMap</span><span class='hs-layout'>)</span> <span class='hs-varid'>infos</span>
<a name="line-763"></a>
<a name="line-764"></a><a name="eqIgnoringKey"></a><span class='hs-definition'>eqIgnoringKey</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>OptionInfo</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OptionInfo</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Bool</span>
<a name="line-765"></a><span class='hs-definition'>eqIgnoringKey</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>normKey</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>normKey</span> <span class='hs-varid'>y</span> <span class='hs-keyword'>where</span>
<a name="line-766"></a>	<span class='hs-varid'>normKey</span> <span class='hs-varid'>info</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>info</span> <span class='hs-layout'>{</span> <span class='hs-varid'>optionInfoKey</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>OptionKeyIgnored</span> <span class='hs-layout'>}</span>
<a name="line-767"></a>
<a name="line-768"></a><a name="Parsed"></a><span class='hs-comment'>-- | See @'parseOptions'@ and @'parseSubcommand'@.</span>
<a name="line-769"></a><a name="Parsed"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Parsed</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-770"></a>	<span class='hs-varid'>parsedError_</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>String</span>
<a name="line-771"></a>	<span class='hs-varid'>parsedHelp_</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span>
<a name="line-772"></a>
<a name="line-773"></a><a name="ParsedOptions"></a><span class='hs-comment'>-- | See @'parseOptions'@.</span>
<a name="line-774"></a><a name="ParsedOptions"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ParsedOptions</span> <span class='hs-varid'>opts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParsedOptions</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-775"></a>
<a name="line-776"></a><a name="ParsedSubcommand"></a><span class='hs-comment'>-- | See @'parseSubcommand'@.</span>
<a name="line-777"></a><a name="ParsedSubcommand"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ParsedSubcommand</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParsedSubcommand</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>action</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span> <span class='hs-conid'>String</span>
<a name="line-778"></a>
<a name="line-779"></a><a name="instance%20Parsed%20(ParsedOptions%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parsed</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParsedOptions</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-780"></a>	<span class='hs-varid'>parsedError_</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParsedOptions</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</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'>x</span>
<a name="line-781"></a>	<span class='hs-varid'>parsedHelp_</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParsedOptions</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-782"></a>
<a name="line-783"></a><a name="instance%20Parsed%20(ParsedSubcommand%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parsed</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParsedSubcommand</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-784"></a>	<span class='hs-varid'>parsedError_</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParsedSubcommand</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-785"></a>	<span class='hs-varid'>parsedHelp_</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParsedSubcommand</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-786"></a>
<a name="line-787"></a><a name="parsedOptions"></a><span class='hs-comment'>-- | Get the options value that was parsed from argv, or @Nothing@ if the</span>
<a name="line-788"></a><span class='hs-comment'>-- arguments could not be converted into options.</span>
<a name="line-789"></a><span class='hs-comment'>--</span>
<a name="line-790"></a><span class='hs-comment'>-- Note: This function return @Nothing@ if the user provided a help flag. To</span>
<a name="line-791"></a><span class='hs-comment'>-- check whether an error occured during parsing, check the value of</span>
<a name="line-792"></a><span class='hs-comment'>-- @'parsedError'@.</span>
<a name="line-793"></a><span class='hs-definition'>parsedOptions</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ParsedOptions</span> <span class='hs-varid'>opts</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>opts</span>
<a name="line-794"></a><span class='hs-definition'>parsedOptions</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParsedOptions</span> <span class='hs-varid'>x</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'>x</span>
<a name="line-795"></a>
<a name="line-796"></a><a name="parsedArguments"></a><span class='hs-comment'>-- | Get command-line arguments remaining after parsing options. The arguments</span>
<a name="line-797"></a><span class='hs-comment'>-- are unchanged from the original argument list, and have not been decoded</span>
<a name="line-798"></a><span class='hs-comment'>-- or otherwise transformed.</span>
<a name="line-799"></a><span class='hs-definition'>parsedArguments</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ParsedOptions</span> <span class='hs-varid'>opts</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-800"></a><span class='hs-definition'>parsedArguments</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParsedOptions</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-801"></a>
<a name="line-802"></a><a name="parsedSubcommand"></a><span class='hs-comment'>-- | Get the subcommand action that was parsed from argv, or @Nothing@ if the</span>
<a name="line-803"></a><span class='hs-comment'>-- arguments could not be converted into a valid action.</span>
<a name="line-804"></a><span class='hs-comment'>--</span>
<a name="line-805"></a><span class='hs-comment'>-- Note: This function return @Nothing@ if the user provided a help flag. To</span>
<a name="line-806"></a><span class='hs-comment'>-- check whether an error occured during parsing, check the value of</span>
<a name="line-807"></a><span class='hs-comment'>-- @'parsedError'@.</span>
<a name="line-808"></a><span class='hs-definition'>parsedSubcommand</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ParsedSubcommand</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>action</span>
<a name="line-809"></a><span class='hs-definition'>parsedSubcommand</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParsedSubcommand</span> <span class='hs-varid'>x</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'>x</span>
<a name="line-810"></a>
<a name="line-811"></a><a name="parsedError"></a><span class='hs-comment'>-- | Get the error that prevented options from being parsed from argv,</span>
<a name="line-812"></a><span class='hs-comment'>-- or @Nothing@ if no error was detected.</span>
<a name="line-813"></a><span class='hs-definition'>parsedError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parsed</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>String</span>
<a name="line-814"></a><span class='hs-definition'>parsedError</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parsedError_</span>
<a name="line-815"></a>
<a name="line-816"></a><a name="parsedHelp"></a><span class='hs-comment'>-- | Get a help message to show the user. If the arguments included</span>
<a name="line-817"></a><span class='hs-comment'>-- a help flag, this will be a message appropriate to that flag.</span>
<a name="line-818"></a><span class='hs-comment'>-- Otherwise, it is a summary (equivalent to @--help@).</span>
<a name="line-819"></a><span class='hs-comment'>--</span>
<a name="line-820"></a><span class='hs-comment'>-- This is always a non-empty string, regardless of whether the parse</span>
<a name="line-821"></a><span class='hs-comment'>-- succeeded or failed. If you need to perform additional validation</span>
<a name="line-822"></a><span class='hs-comment'>-- on the options value, this message can be displayed if validation</span>
<a name="line-823"></a><span class='hs-comment'>-- fails.</span>
<a name="line-824"></a><span class='hs-definition'>parsedHelp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parsed</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span>
<a name="line-825"></a><span class='hs-definition'>parsedHelp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parsedHelp_</span>
<a name="line-826"></a>
<a name="line-827"></a><a name="parseOptions"></a><span class='hs-comment'>-- | Attempt to convert a list of command-line arguments into an options</span>
<a name="line-828"></a><span class='hs-comment'>-- value. This can be used by application developers who want finer control</span>
<a name="line-829"></a><span class='hs-comment'>-- over error handling, or who want to perform additional validation on the</span>
<a name="line-830"></a><span class='hs-comment'>-- options value.</span>
<a name="line-831"></a><span class='hs-comment'>--</span>
<a name="line-832"></a><span class='hs-comment'>-- The argument list must be in the same encoding as the result of</span>
<a name="line-833"></a><span class='hs-comment'>-- 'System.Environment.getArgs'.</span>
<a name="line-834"></a><span class='hs-comment'>--</span>
<a name="line-835"></a><span class='hs-comment'>-- Use @'parsedOptions'@, @'parsedArguments'@, @'parsedError'@, and</span>
<a name="line-836"></a><span class='hs-comment'>-- @'parsedHelp'@ to inspect the result of @'parseOptions'@.</span>
<a name="line-837"></a><span class='hs-comment'>--</span>
<a name="line-838"></a><span class='hs-comment'>-- Example:</span>
<a name="line-839"></a><span class='hs-comment'>--</span>
<a name="line-840"></a><span class='hs-comment'>-- @</span>
<a name="line-841"></a><span class='hs-comment'>--getOptionsOrDie :: Options a =&gt; IO a</span>
<a name="line-842"></a><span class='hs-comment'>--getOptionsOrDie = do</span>
<a name="line-843"></a><span class='hs-comment'>--    argv &lt;- System.Environment.getArgs</span>
<a name="line-844"></a><span class='hs-comment'>--    let parsed = 'parseOptions' argv</span>
<a name="line-845"></a><span class='hs-comment'>--    case 'parsedOptions' parsed of</span>
<a name="line-846"></a><span class='hs-comment'>--        Just opts -&gt; return opts</span>
<a name="line-847"></a><span class='hs-comment'>--        Nothing -&gt; case 'parsedError' parsed of</span>
<a name="line-848"></a><span class='hs-comment'>--            Just err -&gt; do</span>
<a name="line-849"></a><span class='hs-comment'>--                hPutStrLn stderr ('parsedHelp' parsed)</span>
<a name="line-850"></a><span class='hs-comment'>--                hPutStrLn stderr err</span>
<a name="line-851"></a><span class='hs-comment'>--                exitFailure</span>
<a name="line-852"></a><span class='hs-comment'>--            Nothing -&gt; do</span>
<a name="line-853"></a><span class='hs-comment'>--                hPutStr stdout ('parsedHelp' parsed)</span>
<a name="line-854"></a><span class='hs-comment'>--                exitSuccess</span>
<a name="line-855"></a><span class='hs-comment'>-- @</span>
<a name="line-856"></a><span class='hs-definition'>parseOptions</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Options</span> <span class='hs-varid'>opts</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ParsedOptions</span> <span class='hs-varid'>opts</span>
<a name="line-857"></a><span class='hs-definition'>parseOptions</span> <span class='hs-varid'>argv</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parsed</span> <span class='hs-keyword'>where</span>
<a name="line-858"></a>	<span class='hs-layout'>(</span><span class='hs-conid'>DefineOptions</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>getInfos</span> <span class='hs-varid'>parser</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defineOptions</span>
<a name="line-859"></a>	<span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>optionInfos</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getInfos</span> <span class='hs-num'>0</span>
<a name="line-860"></a>	<span class='hs-varid'>parseTokens</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parser</span> <span class='hs-num'>0</span>
<a name="line-861"></a>	
<a name="line-862"></a>	<span class='hs-varid'>parsed</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>validateOptionDefs</span> <span class='hs-varid'>optionInfos</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>of</span>
<a name="line-863"></a>		<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ParsedOptions</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-str'>""</span> <span class='hs-conid'>[]</span>
<a name="line-864"></a>		<span class='hs-conid'>Right</span> <span class='hs-varid'>optionDefs</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>tokenize</span> <span class='hs-layout'>(</span><span class='hs-varid'>addHelpFlags</span> <span class='hs-varid'>optionDefs</span><span class='hs-layout'>)</span> <span class='hs-varid'>argv</span> <span class='hs-keyword'>of</span>
<a name="line-865"></a>			<span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ParsedOptions</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>helpFor</span> <span class='hs-conid'>HelpSummary</span> <span class='hs-varid'>optionDefs</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-866"></a>			<span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>tokens</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>checkHelpFlag</span> <span class='hs-varid'>tokens</span> <span class='hs-keyword'>of</span>
<a name="line-867"></a>				<span class='hs-conid'>Just</span> <span class='hs-varid'>helpFlag</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ParsedOptions</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-varid'>helpFor</span> <span class='hs-varid'>helpFlag</span> <span class='hs-varid'>optionDefs</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-868"></a>				<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>parseTokens</span> <span class='hs-layout'>(</span><span class='hs-varid'>tokensMap</span> <span class='hs-varid'>tokens</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-869"></a>					<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ParsedOptions</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>helpFor</span> <span class='hs-conid'>HelpSummary</span> <span class='hs-varid'>optionDefs</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-870"></a>					<span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ParsedOptions</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-varid'>helpFor</span> <span class='hs-conid'>HelpSummary</span> <span class='hs-varid'>optionDefs</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>tokensArgv</span> <span class='hs-varid'>tokens</span><span class='hs-layout'>)</span>
<a name="line-871"></a>
<a name="line-872"></a><a name="runCommand"></a><span class='hs-comment'>-- | Retrieve 'System.Environment.getArgs', and attempt to parse it into a</span>
<a name="line-873"></a><span class='hs-comment'>-- valid value of an 'Options' type plus a list of left-over arguments. The</span>
<a name="line-874"></a><span class='hs-comment'>-- options and arguments are then passed to the provided computation.</span>
<a name="line-875"></a><span class='hs-comment'>--</span>
<a name="line-876"></a><span class='hs-comment'>-- If parsing fails, this computation will print an error and call</span>
<a name="line-877"></a><span class='hs-comment'>-- 'exitFailure'.</span>
<a name="line-878"></a><span class='hs-comment'>--</span>
<a name="line-879"></a><span class='hs-comment'>-- If parsing succeeds, and the user has passed a @--help@ flag, and the</span>
<a name="line-880"></a><span class='hs-comment'>-- developer is using the default help flag definitions, then this computation</span>
<a name="line-881"></a><span class='hs-comment'>-- will print documentation and call 'exitSuccess'.</span>
<a name="line-882"></a><span class='hs-comment'>--</span>
<a name="line-883"></a><span class='hs-comment'>-- See 'runSubcommand' for details on subcommand support.</span>
<a name="line-884"></a><span class='hs-definition'>runCommand</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Options</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>opts</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-885"></a><span class='hs-definition'>runCommand</span> <span class='hs-varid'>io</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-886"></a>	<span class='hs-varid'>argv</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>liftIO</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Environment</span><span class='hs-varop'>.</span><span class='hs-varid'>getArgs</span>
<a name="line-887"></a>	<span class='hs-keyword'>let</span> <span class='hs-varid'>parsed</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseOptions</span> <span class='hs-varid'>argv</span>
<a name="line-888"></a>	<span class='hs-keyword'>case</span> <span class='hs-varid'>parsedOptions</span> <span class='hs-varid'>parsed</span> <span class='hs-keyword'>of</span>
<a name="line-889"></a>		<span class='hs-conid'>Just</span> <span class='hs-varid'>opts</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>io</span> <span class='hs-varid'>opts</span> <span class='hs-layout'>(</span><span class='hs-varid'>parsedArguments</span> <span class='hs-varid'>parsed</span><span class='hs-layout'>)</span>
<a name="line-890"></a>		<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>parsedError</span> <span class='hs-varid'>parsed</span> <span class='hs-keyword'>of</span>
<a name="line-891"></a>			<span class='hs-conid'>Just</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-892"></a>				<span class='hs-varid'>hPutStrLn</span> <span class='hs-varid'>stderr</span> <span class='hs-layout'>(</span><span class='hs-varid'>parsedHelp</span> <span class='hs-varid'>parsed</span><span class='hs-layout'>)</span>
<a name="line-893"></a>				<span class='hs-varid'>hPutStrLn</span> <span class='hs-varid'>stderr</span> <span class='hs-varid'>err</span>
<a name="line-894"></a>				<span class='hs-varid'>exitFailure</span>
<a name="line-895"></a>			<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-896"></a>				<span class='hs-varid'>hPutStr</span> <span class='hs-varid'>stdout</span> <span class='hs-layout'>(</span><span class='hs-varid'>parsedHelp</span> <span class='hs-varid'>parsed</span><span class='hs-layout'>)</span>
<a name="line-897"></a>				<span class='hs-varid'>exitSuccess</span>
<a name="line-898"></a>
<a name="line-899"></a><a name="Subcommand"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Subcommand</span> <span class='hs-varid'>cmdOpts</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Subcommand</span> <span class='hs-conid'>String</span> <span class='hs-layout'>(</span><span class='hs-conid'>Integer</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>OptionInfo</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmdOpts</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Tokens</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-varid'>action</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Integer</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-900"></a>
<a name="line-901"></a><a name="subcommand"></a><span class='hs-definition'>subcommand</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Options</span> <span class='hs-varid'>cmdOpts</span><span class='hs-layout'>,</span> <span class='hs-conid'>Options</span> <span class='hs-varid'>subcmdOpts</span><span class='hs-layout'>)</span>
<a name="line-902"></a>           <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The subcommand name.</span>
<a name="line-903"></a>           <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>cmdOpts</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>subcmdOpts</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>action</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ The action to run.</span>
<a name="line-904"></a>           <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Subcommand</span> <span class='hs-varid'>cmdOpts</span> <span class='hs-varid'>action</span>
<a name="line-905"></a><span class='hs-definition'>subcommand</span> <span class='hs-varid'>name</span> <span class='hs-varid'>fn</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Subcommand</span> <span class='hs-varid'>name</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>initialKey</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>let</span>
<a name="line-906"></a>	<span class='hs-layout'>(</span><span class='hs-conid'>DefineOptions</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>getInfos</span> <span class='hs-varid'>parser</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defineOptions</span>
<a name="line-907"></a>	<span class='hs-layout'>(</span><span class='hs-varid'>nextKey</span><span class='hs-layout'>,</span> <span class='hs-varid'>optionInfos</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getInfos</span> <span class='hs-varid'>initialKey</span>
<a name="line-908"></a>	<span class='hs-varid'>parseTokens</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parser</span> <span class='hs-varid'>initialKey</span>
<a name="line-909"></a>	
<a name="line-910"></a>	<span class='hs-varid'>runAction</span> <span class='hs-varid'>cmdOpts</span> <span class='hs-varid'>tokens</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>parseTokens</span> <span class='hs-layout'>(</span><span class='hs-varid'>tokensMap</span> <span class='hs-varid'>tokens</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-911"></a>		<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-912"></a>		<span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>subOpts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>fn</span> <span class='hs-varid'>cmdOpts</span> <span class='hs-varid'>subOpts</span> <span class='hs-layout'>(</span><span class='hs-varid'>tokensArgv</span> <span class='hs-varid'>tokens</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-913"></a>	<span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-varid'>optionInfos</span><span class='hs-layout'>,</span> <span class='hs-varid'>runAction</span><span class='hs-layout'>,</span> <span class='hs-varid'>nextKey</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-914"></a>
<a name="line-915"></a><a name="parseSubcommand"></a><span class='hs-comment'>-- | Attempt to convert a list of command-line arguments into a subcommand</span>
<a name="line-916"></a><span class='hs-comment'>-- action. This can be used by application developers who want finer control</span>
<a name="line-917"></a><span class='hs-comment'>-- over error handling, or who want subcommands that run in an unusual monad.</span>
<a name="line-918"></a><span class='hs-comment'>--</span>
<a name="line-919"></a><span class='hs-comment'>-- The argument list must be in the same encoding as the result of</span>
<a name="line-920"></a><span class='hs-comment'>-- 'System.Environment.getArgs'.</span>
<a name="line-921"></a><span class='hs-comment'>--</span>
<a name="line-922"></a><span class='hs-comment'>-- Use @'parsedSubcommand'@, @'parsedError'@, and @'parsedHelp'@ to inspect the</span>
<a name="line-923"></a><span class='hs-comment'>-- result of @'parseSubcommand'@.</span>
<a name="line-924"></a><span class='hs-comment'>--</span>
<a name="line-925"></a><span class='hs-comment'>-- Example:</span>
<a name="line-926"></a><span class='hs-comment'>--</span>
<a name="line-927"></a><span class='hs-comment'>-- @</span>
<a name="line-928"></a><span class='hs-comment'>--runSubcommand :: Options cmdOpts =&gt; [Subcommand cmdOpts (IO a)] -&gt; IO a</span>
<a name="line-929"></a><span class='hs-comment'>--runSubcommand subcommands = do</span>
<a name="line-930"></a><span class='hs-comment'>--    argv &lt;- System.Environment.getArgs</span>
<a name="line-931"></a><span class='hs-comment'>--    let parsed = 'parseSubcommand' subcommands argv</span>
<a name="line-932"></a><span class='hs-comment'>--    case 'parsedSubcommand' parsed of</span>
<a name="line-933"></a><span class='hs-comment'>--        Just cmd -&gt; cmd</span>
<a name="line-934"></a><span class='hs-comment'>--        Nothing -&gt; case 'parsedError' parsed of</span>
<a name="line-935"></a><span class='hs-comment'>--            Just err -&gt; do</span>
<a name="line-936"></a><span class='hs-comment'>--                hPutStrLn stderr ('parsedHelp' parsed)</span>
<a name="line-937"></a><span class='hs-comment'>--                hPutStrLn stderr err</span>
<a name="line-938"></a><span class='hs-comment'>--                exitFailure</span>
<a name="line-939"></a><span class='hs-comment'>--            Nothing -&gt; do</span>
<a name="line-940"></a><span class='hs-comment'>--                hPutStr stdout ('parsedHelp' parsed)</span>
<a name="line-941"></a><span class='hs-comment'>--                exitSuccess</span>
<a name="line-942"></a><span class='hs-comment'>-- @</span>
<a name="line-943"></a><span class='hs-comment'>--</span>
<a name="line-944"></a><span class='hs-definition'>parseSubcommand</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Options</span> <span class='hs-varid'>cmdOpts</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Subcommand</span> <span class='hs-varid'>cmdOpts</span> <span class='hs-varid'>action</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ParsedSubcommand</span> <span class='hs-varid'>action</span>
<a name="line-945"></a><span class='hs-definition'>parseSubcommand</span> <span class='hs-varid'>subcommands</span> <span class='hs-varid'>argv</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parsed</span> <span class='hs-keyword'>where</span>
<a name="line-946"></a>	<span class='hs-layout'>(</span><span class='hs-conid'>DefineOptions</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>getInfos</span> <span class='hs-varid'>parser</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defineOptions</span>
<a name="line-947"></a>	<span class='hs-layout'>(</span><span class='hs-varid'>cmdNextKey</span><span class='hs-layout'>,</span> <span class='hs-varid'>cmdInfos</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getInfos</span> <span class='hs-num'>0</span>
<a name="line-948"></a>	<span class='hs-varid'>cmdParseTokens</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parser</span> <span class='hs-num'>0</span>
<a name="line-949"></a>	
<a name="line-950"></a>	<span class='hs-varid'>subcmdInfos</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-951"></a>		<span class='hs-conid'>Subcommand</span> <span class='hs-varid'>name</span> <span class='hs-varid'>fn</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>subcommands</span>
<a name="line-952"></a>		<span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>infos</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fn</span> <span class='hs-varid'>cmdNextKey</span>
<a name="line-953"></a>		<span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>name</span><span class='hs-layout'>,</span> <span class='hs-varid'>infos</span><span class='hs-layout'>)</span>
<a name="line-954"></a>	
<a name="line-955"></a>	<span class='hs-varid'>subcmdRunners</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-956"></a>		<span class='hs-conid'>Subcommand</span> <span class='hs-varid'>name</span> <span class='hs-varid'>fn</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>subcommands</span>
<a name="line-957"></a>		<span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>runner</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fn</span> <span class='hs-varid'>cmdNextKey</span>
<a name="line-958"></a>		<span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>name</span><span class='hs-layout'>,</span> <span class='hs-varid'>runner</span><span class='hs-layout'>)</span>
<a name="line-959"></a>	
<a name="line-960"></a>	<span class='hs-varid'>parsed</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>validateOptionDefs</span> <span class='hs-varid'>cmdInfos</span> <span class='hs-varid'>subcmdInfos</span> <span class='hs-keyword'>of</span>
<a name="line-961"></a>		<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ParsedSubcommand</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-str'>""</span>
<a name="line-962"></a>		<span class='hs-conid'>Right</span> <span class='hs-varid'>optionDefs</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>tokenize</span> <span class='hs-layout'>(</span><span class='hs-varid'>addHelpFlags</span> <span class='hs-varid'>optionDefs</span><span class='hs-layout'>)</span> <span class='hs-varid'>argv</span> <span class='hs-keyword'>of</span>
<a name="line-963"></a>			<span class='hs-layout'>(</span><span class='hs-varid'>subcmd</span><span class='hs-layout'>,</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ParsedSubcommand</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>helpFor</span> <span class='hs-conid'>HelpSummary</span> <span class='hs-varid'>optionDefs</span> <span class='hs-varid'>subcmd</span><span class='hs-layout'>)</span>
<a name="line-964"></a>			<span class='hs-layout'>(</span><span class='hs-varid'>subcmd</span><span class='hs-layout'>,</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>tokens</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>checkHelpFlag</span> <span class='hs-varid'>tokens</span> <span class='hs-keyword'>of</span>
<a name="line-965"></a>				<span class='hs-conid'>Just</span> <span class='hs-varid'>helpFlag</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ParsedSubcommand</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-varid'>helpFor</span> <span class='hs-varid'>helpFlag</span> <span class='hs-varid'>optionDefs</span> <span class='hs-varid'>subcmd</span><span class='hs-layout'>)</span>
<a name="line-966"></a>				<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>findAction</span> <span class='hs-varid'>tokens</span> <span class='hs-varid'>subcmd</span> <span class='hs-keyword'>of</span>
<a name="line-967"></a>					<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ParsedSubcommand</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>helpFor</span> <span class='hs-conid'>HelpSummary</span> <span class='hs-varid'>optionDefs</span> <span class='hs-varid'>subcmd</span><span class='hs-layout'>)</span>
<a name="line-968"></a>					<span class='hs-conid'>Right</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ParsedSubcommand</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>action</span><span class='hs-layout'>)</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-varid'>helpFor</span> <span class='hs-conid'>HelpSummary</span> <span class='hs-varid'>optionDefs</span> <span class='hs-varid'>subcmd</span><span class='hs-layout'>)</span>
<a name="line-969"></a>	
<a name="line-970"></a>	<span class='hs-varid'>findAction</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Left</span> <span class='hs-str'>"No subcommand specified"</span>
<a name="line-971"></a>	<span class='hs-varid'>findAction</span> <span class='hs-varid'>tokens</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>subcmdName</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>cmdParseTokens</span> <span class='hs-layout'>(</span><span class='hs-varid'>tokensMap</span> <span class='hs-varid'>tokens</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-972"></a>		<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-973"></a>		<span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>cmdOpts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>subcmdName</span> <span class='hs-varid'>subcmdRunners</span> <span class='hs-keyword'>of</span>
<a name="line-974"></a>			<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-str'>"Unknown subcommand "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>subcmdName</span> <span class='hs-varop'>++</span> <span class='hs-str'>"."</span><span class='hs-layout'>)</span>
<a name="line-975"></a>			<span class='hs-conid'>Just</span> <span class='hs-varid'>getRunner</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>getRunner</span> <span class='hs-varid'>cmdOpts</span> <span class='hs-varid'>tokens</span> <span class='hs-keyword'>of</span>
<a name="line-976"></a>				<span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span>
<a name="line-977"></a>				<span class='hs-conid'>Right</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>action</span>
<a name="line-978"></a>
<a name="line-979"></a><a name="runSubcommand"></a><span class='hs-comment'>-- | Used to run applications that are split into subcommands.</span>
<a name="line-980"></a><span class='hs-comment'>--</span>
<a name="line-981"></a><span class='hs-comment'>-- Use 'subcommand' to define available commands and their actions, then pass</span>
<a name="line-982"></a><span class='hs-comment'>-- them to this computation to select one and run it. If the user specifies</span>
<a name="line-983"></a><span class='hs-comment'>-- an invalid subcommand, this computation will print an error and call</span>
<a name="line-984"></a><span class='hs-comment'>-- 'exitFailure'. In handling of invalid flags or @--help@, 'runSubcommand'</span>
<a name="line-985"></a><span class='hs-comment'>-- acts like 'runCommand'.</span>
<a name="line-986"></a><span class='hs-comment'>--</span>
<a name="line-987"></a><span class='hs-comment'>-- @</span>
<a name="line-988"></a><span class='hs-comment'>--import Control.Applicative</span>
<a name="line-989"></a><span class='hs-comment'>--import Control.Monad (unless)</span>
<a name="line-990"></a><span class='hs-comment'>--import Options</span>
<a name="line-991"></a><span class='hs-comment'>--</span>
<a name="line-992"></a><span class='hs-comment'>--data MainOptions = MainOptions { optQuiet :: Bool }</span>
<a name="line-993"></a><span class='hs-comment'>--instance 'Options' MainOptions where</span>
<a name="line-994"></a><span class='hs-comment'>--    'defineOptions' = pure MainOptions</span>
<a name="line-995"></a><span class='hs-comment'>--        \&lt;*\&gt; 'simpleOption' \"quiet\" False \"Whether to be quiet.\"</span>
<a name="line-996"></a><span class='hs-comment'>--</span>
<a name="line-997"></a><span class='hs-comment'>--data HelloOpts = HelloOpts { optHello :: String }</span>
<a name="line-998"></a><span class='hs-comment'>--instance 'Options' HelloOpts where</span>
<a name="line-999"></a><span class='hs-comment'>--    'defineOptions' = pure HelloOpts</span>
<a name="line-1000"></a><span class='hs-comment'>--        \&lt;*\&gt; 'simpleOption' \"hello\" \"Hello!\" \"How to say hello.\"</span>
<a name="line-1001"></a><span class='hs-comment'>--</span>
<a name="line-1002"></a><span class='hs-comment'>--data ByeOpts = ByeOpts { optName :: String }</span>
<a name="line-1003"></a><span class='hs-comment'>--instance 'Options' ByeOpts where</span>
<a name="line-1004"></a><span class='hs-comment'>--    'defineOptions' = pure ByeOpts</span>
<a name="line-1005"></a><span class='hs-comment'>--        \&lt;*\&gt; 'simpleOption' \"name\" \"\" \"The user's name.\"</span>
<a name="line-1006"></a><span class='hs-comment'>--</span>
<a name="line-1007"></a><span class='hs-comment'>--hello :: MainOptions -&gt; HelloOpts -&gt; [String] -&gt; IO ()</span>
<a name="line-1008"></a><span class='hs-comment'>--hello mainOpts opts args = unless (optQuiet mainOpts) $ do</span>
<a name="line-1009"></a><span class='hs-comment'>--    putStrLn (optHello opts)</span>
<a name="line-1010"></a><span class='hs-comment'>--</span>
<a name="line-1011"></a><span class='hs-comment'>--bye :: MainOptions -&gt; ByeOpts -&gt; [String] -&gt; IO ()</span>
<a name="line-1012"></a><span class='hs-comment'>--bye mainOpts opts args = unless (optQuiet mainOpts) $ do</span>
<a name="line-1013"></a><span class='hs-comment'>--    putStrLn (\"Good bye \" ++ optName opts)</span>
<a name="line-1014"></a><span class='hs-comment'>--</span>
<a name="line-1015"></a><span class='hs-comment'>--main :: IO ()</span>
<a name="line-1016"></a><span class='hs-comment'>--main = 'runSubcommand'</span>
<a name="line-1017"></a><span class='hs-comment'>--    [ 'subcommand' \"hello\" hello</span>
<a name="line-1018"></a><span class='hs-comment'>--    , 'subcommand' \"bye\" bye</span>
<a name="line-1019"></a><span class='hs-comment'>--    ]</span>
<a name="line-1020"></a><span class='hs-comment'>-- @</span>
<a name="line-1021"></a><span class='hs-comment'>--</span>
<a name="line-1022"></a><span class='hs-comment'>-- &gt;$ ./app hello</span>
<a name="line-1023"></a><span class='hs-comment'>-- &gt;Hello!</span>
<a name="line-1024"></a><span class='hs-comment'>-- &gt;$ ./app hello --hello='Allo!'</span>
<a name="line-1025"></a><span class='hs-comment'>-- &gt;Allo!</span>
<a name="line-1026"></a><span class='hs-comment'>-- &gt;$ ./app bye</span>
<a name="line-1027"></a><span class='hs-comment'>-- &gt;Good bye </span>
<a name="line-1028"></a><span class='hs-comment'>-- &gt;$ ./app bye --name='Alice'</span>
<a name="line-1029"></a><span class='hs-comment'>-- &gt;Good bye Alice</span>
<a name="line-1030"></a><span class='hs-definition'>runSubcommand</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Options</span> <span class='hs-varid'>opts</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Subcommand</span> <span class='hs-varid'>opts</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-1031"></a><span class='hs-definition'>runSubcommand</span> <span class='hs-varid'>subcommands</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-1032"></a>	<span class='hs-varid'>argv</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>liftIO</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Environment</span><span class='hs-varop'>.</span><span class='hs-varid'>getArgs</span>
<a name="line-1033"></a>	<span class='hs-keyword'>let</span> <span class='hs-varid'>parsed</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseSubcommand</span> <span class='hs-varid'>subcommands</span> <span class='hs-varid'>argv</span>
<a name="line-1034"></a>	<span class='hs-keyword'>case</span> <span class='hs-varid'>parsedSubcommand</span> <span class='hs-varid'>parsed</span> <span class='hs-keyword'>of</span>
<a name="line-1035"></a>		<span class='hs-conid'>Just</span> <span class='hs-varid'>cmd</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>cmd</span>
<a name="line-1036"></a>		<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>parsedError</span> <span class='hs-varid'>parsed</span> <span class='hs-keyword'>of</span>
<a name="line-1037"></a>			<span class='hs-conid'>Just</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-1038"></a>				<span class='hs-varid'>hPutStrLn</span> <span class='hs-varid'>stderr</span> <span class='hs-layout'>(</span><span class='hs-varid'>parsedHelp</span> <span class='hs-varid'>parsed</span><span class='hs-layout'>)</span>
<a name="line-1039"></a>				<span class='hs-varid'>hPutStrLn</span> <span class='hs-varid'>stderr</span> <span class='hs-varid'>err</span>
<a name="line-1040"></a>				<span class='hs-varid'>exitFailure</span>
<a name="line-1041"></a>			<span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-1042"></a>				<span class='hs-varid'>hPutStr</span> <span class='hs-varid'>stdout</span> <span class='hs-layout'>(</span><span class='hs-varid'>parsedHelp</span> <span class='hs-varid'>parsed</span><span class='hs-layout'>)</span>
<a name="line-1043"></a>				<span class='hs-varid'>exitSuccess</span>
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