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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE DeriveDataTypeable #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances #-}</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE NoMonomorphismRestriction #-}</span>
<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE RankNTypes #-}</span>
<a name="line-6"></a><span class='hs-comment'>{-# LANGUAGE TemplateHaskell #-}</span>
<a name="line-7"></a><span class='hs-comment'>{-# LANGUAGE TypeFamilies #-}</span>
<a name="line-8"></a><span class='hs-comment'>{-# LANGUAGE UndecidableInstances #-}</span>
<a name="line-9"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-10"></a><span class='hs-comment'>-- |</span>
<a name="line-11"></a><span class='hs-comment'>-- Module : Diagrams.Backend.CmdLine</span>
<a name="line-12"></a><span class='hs-comment'>-- Copyright : (c) 2013 Diagrams team (see LICENSE)</span>
<a name="line-13"></a><span class='hs-comment'>-- License : BSD-style (see LICENSE)</span>
<a name="line-14"></a><span class='hs-comment'>-- Maintainer : diagrams-discuss@googlegroups.com</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>-- Convenient creation of command-line-driven executables for</span>
<a name="line-17"></a><span class='hs-comment'>-- rendering diagrams. This module provides a general framework</span>
<a name="line-18"></a><span class='hs-comment'>-- and default behaviors for parsing command-line arguments,</span>
<a name="line-19"></a><span class='hs-comment'>-- records for diagram creation options in various forms, and</span>
<a name="line-20"></a><span class='hs-comment'>-- classes and instances for a unified entry point to command-line-driven</span>
<a name="line-21"></a><span class='hs-comment'>-- diagram creation executables.</span>
<a name="line-22"></a><span class='hs-comment'>--</span>
<a name="line-23"></a><span class='hs-comment'>-- For a tutorial on command-line diagram creation see</span>
<a name="line-24"></a><span class='hs-comment'>-- <<a href="http://projects.haskell.org/diagrams/doc/cmdline.html">http://projects.haskell.org/diagrams/doc/cmdline.html</a>>.</span>
<a name="line-25"></a><span class='hs-comment'>--</span>
<a name="line-26"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Diagrams</span><span class='hs-varop'>.</span><span class='hs-conid'>Backend</span><span class='hs-varop'>.</span><span class='hs-conid'>CmdLine</span>
<a name="line-29"></a> <span class='hs-layout'>(</span>
<a name="line-30"></a>
<a name="line-31"></a> <span class='hs-comment'>-- * Options</span>
<a name="line-32"></a>
<a name="line-33"></a> <span class='hs-comment'>-- ** Standard options</span>
<a name="line-34"></a> <span class='hs-conid'>DiagramOpts</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>diagramOpts</span>
<a name="line-36"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>width</span>
<a name="line-37"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>height</span>
<a name="line-38"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>output</span>
<a name="line-39"></a>
<a name="line-40"></a> <span class='hs-comment'>-- ** Multi-diagram options</span>
<a name="line-41"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DiagramMultiOpts</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-42"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>diagramMultiOpts</span>
<a name="line-43"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>selection</span>
<a name="line-44"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>list</span>
<a name="line-45"></a>
<a name="line-46"></a> <span class='hs-comment'>-- ** Animation options</span>
<a name="line-47"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DiagramAnimOpts</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-48"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>diagramAnimOpts</span>
<a name="line-49"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fpu</span>
<a name="line-50"></a>
<a name="line-51"></a> <span class='hs-comment'>-- ** Loop options</span>
<a name="line-52"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DiagramLoopOpts</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-53"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>diagramLoopOpts</span>
<a name="line-54"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>loop</span>
<a name="line-55"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>src</span>
<a name="line-56"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>interval</span>
<a name="line-57"></a>
<a name="line-58"></a> <span class='hs-comment'>-- * Parsing</span>
<a name="line-59"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Parseable</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-60"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>readHexColor</span>
<a name="line-61"></a>
<a name="line-62"></a> <span class='hs-comment'>-- * Command-line programs (@Mainable@)</span>
<a name="line-63"></a> <span class='hs-comment'>-- ** Arguments, rendering, and entry point</span>
<a name="line-64"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Mainable</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-65"></a>
<a name="line-66"></a> <span class='hs-comment'>-- ** General currying</span>
<a name="line-67"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>ToResult</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-68"></a>
<a name="line-69"></a> <span class='hs-comment'>-- ** Default @mainRender@ implementations</span>
<a name="line-70"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>defaultAnimMainRender</span>
<a name="line-71"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>defaultMultiMainRender</span>
<a name="line-72"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-73"></a>
<a name="line-74"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>argument</span><span class='hs-layout'>)</span>
<a name="line-75"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Diagrams</span><span class='hs-varop'>.</span><span class='hs-conid'>Animation</span>
<a name="line-76"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Diagrams</span><span class='hs-varop'>.</span><span class='hs-conid'>Attributes</span>
<a name="line-77"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Diagrams</span><span class='hs-varop'>.</span><span class='hs-conid'>Core</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>value</span><span class='hs-layout'>)</span>
<a name="line-78"></a>
<a name="line-79"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Options</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span>
<a name="line-80"></a>
<a name="line-81"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span>
<a name="line-82"></a>
<a name="line-83"></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-84"></a>
<a name="line-85"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Active</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>interval</span><span class='hs-layout'>)</span>
<a name="line-86"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span> <span class='hs-layout'>(</span><span class='hs-varid'>isDigit</span><span class='hs-layout'>)</span>
<a name="line-87"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Colour</span>
<a name="line-88"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Colour</span><span class='hs-varop'>.</span><span class='hs-conid'>Names</span>
<a name="line-89"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Colour</span><span class='hs-varop'>.</span><span class='hs-conid'>SRGB</span>
<a name="line-90"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span>
<a name="line-91"></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-92"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
<a name="line-93"></a>
<a name="line-94"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Numeric</span>
<a name="line-95"></a>
<a name="line-96"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Safe</span> <span class='hs-layout'>(</span><span class='hs-varid'>readMay</span><span class='hs-layout'>)</span>
<a name="line-97"></a>
<a name="line-98"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Environment</span> <span class='hs-layout'>(</span><span class='hs-varid'>getProgName</span><span class='hs-layout'>)</span>
<a name="line-99"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>FilePath</span> <span class='hs-layout'>(</span><span class='hs-varid'>addExtension</span><span class='hs-layout'>,</span> <span class='hs-varid'>splitExtension</span><span class='hs-layout'>)</span>
<a name="line-100"></a>
<a name="line-101"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Printf</span>
<a name="line-102"></a>
<a name="line-103"></a><a name="DiagramOpts"></a><span class='hs-comment'>-- | Standard options most diagrams are likely to have.</span>
<a name="line-104"></a><a name="DiagramOpts"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DiagramOpts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DiagramOpts</span>
<a name="line-105"></a> <span class='hs-layout'>{</span> <span class='hs-sel'>_width</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Final output width of diagram.</span>
<a name="line-106"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_height</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Final output height of diagram.</span>
<a name="line-107"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_output</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePath</span> <span class='hs-comment'>-- ^ Output file path, format is typically chosen by extension.</span>
<a name="line-108"></a> <span class='hs-layout'>}</span>
<a name="line-109"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Data</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-110"></a>
<a name="line-111"></a><a name="makeLenses"></a><span class='hs-definition'>makeLenses</span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>DiagramOpts</span>
<a name="line-112"></a>
<a name="line-113"></a><a name="DiagramMultiOpts"></a><span class='hs-comment'>-- | Extra options for a program that can offer a choice</span>
<a name="line-114"></a><a name="DiagramMultiOpts"></a><span class='hs-comment'>-- between multiple diagrams.</span>
<a name="line-115"></a><a name="DiagramMultiOpts"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DiagramMultiOpts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DiagramMultiOpts</span>
<a name="line-116"></a> <span class='hs-layout'>{</span> <span class='hs-sel'>_selection</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ Selected diagram to render.</span>
<a name="line-117"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_list</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-comment'>-- ^ Flag to indicate that a list of available diagrams should</span>
<a name="line-118"></a> <span class='hs-comment'>-- be printed to standard out.</span>
<a name="line-119"></a> <span class='hs-layout'>}</span>
<a name="line-120"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Data</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-121"></a>
<a name="line-122"></a><span class='hs-definition'>makeLenses</span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>DiagramMultiOpts</span>
<a name="line-123"></a>
<a name="line-124"></a><a name="DiagramAnimOpts"></a><span class='hs-comment'>-- | Extra options for animations.</span>
<a name="line-125"></a><a name="DiagramAnimOpts"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DiagramAnimOpts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DiagramAnimOpts</span>
<a name="line-126"></a> <span class='hs-layout'>{</span> <span class='hs-sel'>_fpu</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Double</span> <span class='hs-comment'>-- ^ Number of frames per unit time to generate for the animation.</span>
<a name="line-127"></a> <span class='hs-layout'>}</span>
<a name="line-128"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Data</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-129"></a>
<a name="line-130"></a><span class='hs-definition'>makeLenses</span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>DiagramAnimOpts</span>
<a name="line-131"></a>
<a name="line-132"></a><a name="DiagramLoopOpts"></a><span class='hs-comment'>-- | Extra options for command-line looping.</span>
<a name="line-133"></a><a name="DiagramLoopOpts"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DiagramLoopOpts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DiagramLoopOpts</span>
<a name="line-134"></a> <span class='hs-layout'>{</span> <span class='hs-sel'>_loop</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-comment'>-- ^ Flag to indicate that the program should loop creation.</span>
<a name="line-135"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_src</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>FilePath</span> <span class='hs-comment'>-- ^ File path for the source file to recompile.</span>
<a name="line-136"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_interval</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Interval in seconds at which to check for recompilation.</span>
<a name="line-137"></a> <span class='hs-layout'>}</span>
<a name="line-138"></a>
<a name="line-139"></a><span class='hs-definition'>makeLenses</span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>DiagramLoopOpts</span>
<a name="line-140"></a>
<a name="line-141"></a><a name="diagramOpts"></a><span class='hs-comment'>-- | Command line parser for 'DiagramOpts'.</span>
<a name="line-142"></a><span class='hs-comment'>-- Width is option @--width@ or @-w@.</span>
<a name="line-143"></a><span class='hs-comment'>-- Height is option @--height@ or @-h@ (note we change help to be @-?@ due to this).</span>
<a name="line-144"></a><span class='hs-comment'>-- Output is option @--output@ or @-o@.</span>
<a name="line-145"></a><span class='hs-definition'>diagramOpts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-conid'>DiagramOpts</span>
<a name="line-146"></a><span class='hs-definition'>diagramOpts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DiagramOpts</span>
<a name="line-147"></a> <span class='hs-varop'><$></span> <span class='hs-layout'>(</span><span class='hs-varid'>optional</span> <span class='hs-varop'>.</span> <span class='hs-varid'>option</span> <span class='hs-varid'>auto</span><span class='hs-layout'>)</span>
<a name="line-148"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>long</span> <span class='hs-str'>"width"</span> <span class='hs-varop'><></span> <span class='hs-varid'>short</span> <span class='hs-chr'>'w'</span>
<a name="line-149"></a> <span class='hs-varop'><></span> <span class='hs-varid'>metavar</span> <span class='hs-str'>"WIDTH"</span>
<a name="line-150"></a> <span class='hs-varop'><></span> <span class='hs-varid'>help</span> <span class='hs-str'>"Desired WIDTH of the output image"</span><span class='hs-layout'>)</span>
<a name="line-151"></a> <span class='hs-varop'><*></span> <span class='hs-layout'>(</span><span class='hs-varid'>optional</span> <span class='hs-varop'>.</span> <span class='hs-varid'>option</span> <span class='hs-varid'>auto</span><span class='hs-layout'>)</span>
<a name="line-152"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>long</span> <span class='hs-str'>"height"</span> <span class='hs-varop'><></span> <span class='hs-varid'>short</span> <span class='hs-chr'>'h'</span>
<a name="line-153"></a> <span class='hs-varop'><></span> <span class='hs-varid'>metavar</span> <span class='hs-str'>"HEIGHT"</span>
<a name="line-154"></a> <span class='hs-varop'><></span> <span class='hs-varid'>help</span> <span class='hs-str'>"Desired HEIGHT of the output image"</span><span class='hs-layout'>)</span>
<a name="line-155"></a> <span class='hs-varop'><*></span> <span class='hs-varid'>strOption</span>
<a name="line-156"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>long</span> <span class='hs-str'>"output"</span> <span class='hs-varop'><></span> <span class='hs-varid'>short</span> <span class='hs-chr'>'o'</span>
<a name="line-157"></a> <span class='hs-varop'><></span> <span class='hs-varid'>value</span> <span class='hs-str'>""</span>
<a name="line-158"></a> <span class='hs-varop'><></span> <span class='hs-varid'>metavar</span> <span class='hs-str'>"OUTPUT"</span>
<a name="line-159"></a> <span class='hs-varop'><></span> <span class='hs-varid'>help</span> <span class='hs-str'>"OUTPUT file"</span><span class='hs-layout'>)</span>
<a name="line-160"></a>
<a name="line-161"></a><a name="diagramMultiOpts"></a><span class='hs-comment'>-- | Command line parser for 'DiagramMultiOpts'.</span>
<a name="line-162"></a><span class='hs-comment'>-- Selection is option @--selection@ or @-s@.</span>
<a name="line-163"></a><span class='hs-comment'>-- List is @--list@ or @-l@.</span>
<a name="line-164"></a><span class='hs-definition'>diagramMultiOpts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-conid'>DiagramMultiOpts</span>
<a name="line-165"></a><span class='hs-definition'>diagramMultiOpts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DiagramMultiOpts</span>
<a name="line-166"></a> <span class='hs-varop'><$></span> <span class='hs-layout'>(</span><span class='hs-varid'>optional</span> <span class='hs-varop'>.</span> <span class='hs-varid'>strOption</span><span class='hs-layout'>)</span>
<a name="line-167"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>long</span> <span class='hs-str'>"selection"</span> <span class='hs-varop'><></span> <span class='hs-varid'>short</span> <span class='hs-chr'>'s'</span>
<a name="line-168"></a> <span class='hs-varop'><></span> <span class='hs-varid'>metavar</span> <span class='hs-str'>"NAME"</span>
<a name="line-169"></a> <span class='hs-varop'><></span> <span class='hs-varid'>help</span> <span class='hs-str'>"NAME of the diagram to render"</span><span class='hs-layout'>)</span>
<a name="line-170"></a> <span class='hs-varop'><*></span> <span class='hs-varid'>switch</span>
<a name="line-171"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>long</span> <span class='hs-str'>"list"</span> <span class='hs-varop'><></span> <span class='hs-varid'>short</span> <span class='hs-chr'>'l'</span>
<a name="line-172"></a> <span class='hs-varop'><></span> <span class='hs-varid'>help</span> <span class='hs-str'>"List all available diagrams"</span><span class='hs-layout'>)</span>
<a name="line-173"></a>
<a name="line-174"></a><a name="diagramAnimOpts"></a><span class='hs-comment'>-- | Command line parser for 'DiagramAnimOpts'</span>
<a name="line-175"></a><span class='hs-comment'>-- Frames per unit is @--fpu@ or @-f@.</span>
<a name="line-176"></a><span class='hs-definition'>diagramAnimOpts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-conid'>DiagramAnimOpts</span>
<a name="line-177"></a><span class='hs-definition'>diagramAnimOpts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DiagramAnimOpts</span>
<a name="line-178"></a> <span class='hs-varop'><$></span> <span class='hs-varid'>option</span> <span class='hs-varid'>auto</span>
<a name="line-179"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>long</span> <span class='hs-str'>"fpu"</span> <span class='hs-varop'><></span> <span class='hs-varid'>short</span> <span class='hs-chr'>'f'</span>
<a name="line-180"></a> <span class='hs-varop'><></span> <span class='hs-varid'>value</span> <span class='hs-num'>30.0</span>
<a name="line-181"></a> <span class='hs-varop'><></span> <span class='hs-varid'>help</span> <span class='hs-str'>"Frames per unit time (for animations)"</span><span class='hs-layout'>)</span>
<a name="line-182"></a>
<a name="line-183"></a><a name="diagramLoopOpts"></a><span class='hs-comment'>-- | CommandLine parser for 'DiagramLoopOpts'</span>
<a name="line-184"></a><span class='hs-comment'>-- Loop is @--loop@ or @-l@.</span>
<a name="line-185"></a><span class='hs-comment'>-- Source is @--src@ or @-s@.</span>
<a name="line-186"></a><span class='hs-comment'>-- Interval is @-i@ defaulting to one second.</span>
<a name="line-187"></a><span class='hs-definition'>diagramLoopOpts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-conid'>DiagramLoopOpts</span>
<a name="line-188"></a><span class='hs-definition'>diagramLoopOpts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DiagramLoopOpts</span>
<a name="line-189"></a> <span class='hs-varop'><$></span> <span class='hs-varid'>switch</span> <span class='hs-layout'>(</span><span class='hs-varid'>long</span> <span class='hs-str'>"loop"</span> <span class='hs-varop'><></span> <span class='hs-varid'>short</span> <span class='hs-chr'>'l'</span> <span class='hs-varop'><></span> <span class='hs-varid'>help</span> <span class='hs-str'>"Run in a self-recompiling loop"</span><span class='hs-layout'>)</span>
<a name="line-190"></a> <span class='hs-varop'><*></span> <span class='hs-layout'>(</span><span class='hs-varid'>optional</span> <span class='hs-varop'>.</span> <span class='hs-varid'>strOption</span><span class='hs-layout'>)</span>
<a name="line-191"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>long</span> <span class='hs-str'>"src"</span> <span class='hs-varop'><></span> <span class='hs-varid'>short</span> <span class='hs-chr'>'s'</span>
<a name="line-192"></a> <span class='hs-varop'><></span> <span class='hs-varid'>help</span> <span class='hs-str'>"Source file to watch"</span><span class='hs-layout'>)</span>
<a name="line-193"></a> <span class='hs-varop'><*></span> <span class='hs-varid'>option</span> <span class='hs-varid'>auto</span>
<a name="line-194"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>long</span> <span class='hs-str'>"interval"</span> <span class='hs-varop'><></span> <span class='hs-varid'>short</span> <span class='hs-chr'>'i'</span>
<a name="line-195"></a> <span class='hs-varop'><></span> <span class='hs-varid'>value</span> <span class='hs-num'>1</span>
<a name="line-196"></a> <span class='hs-varop'><></span> <span class='hs-varid'>metavar</span> <span class='hs-str'>"INTERVAL"</span>
<a name="line-197"></a> <span class='hs-varop'><></span> <span class='hs-varid'>help</span> <span class='hs-str'>"When running in a loop, check for changes every INTERVAL seconds."</span><span class='hs-layout'>)</span>
<a name="line-198"></a>
<a name="line-199"></a><a name="helper'"></a><span class='hs-comment'>-- | A hidden \"helper\" option which always fails.</span>
<a name="line-200"></a><span class='hs-comment'>-- Taken from Options.Applicative.Extra but without the</span>
<a name="line-201"></a><span class='hs-comment'>-- short option 'h'. We want the 'h' for Height.</span>
<a name="line-202"></a><span class='hs-definition'>helper'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-203"></a><span class='hs-definition'>helper'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>abortOption</span> <span class='hs-conid'>ShowHelpText</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mconcat</span>
<a name="line-204"></a> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>long</span> <span class='hs-str'>"help"</span>
<a name="line-205"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>short</span> <span class='hs-chr'>'?'</span>
<a name="line-206"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>help</span> <span class='hs-str'>"Show this help text"</span>
<a name="line-207"></a> <span class='hs-keyglyph'>]</span>
<a name="line-208"></a>
<a name="line-209"></a><a name="defaultOpts"></a><span class='hs-comment'>-- | Apply a parser to the command line that includes the standard</span>
<a name="line-210"></a><span class='hs-comment'>-- program description and help behavior. Results in parsed commands</span>
<a name="line-211"></a><span class='hs-comment'>-- or fails with a help message.</span>
<a name="line-212"></a><span class='hs-definition'>defaultOpts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-213"></a><span class='hs-definition'>defaultOpts</span> <span class='hs-varid'>optsParser</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-214"></a> <span class='hs-varid'>prog</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getProgName</span>
<a name="line-215"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>info</span> <span class='hs-layout'>(</span><span class='hs-varid'>helper'</span> <span class='hs-varop'><*></span> <span class='hs-varid'>optsParser</span><span class='hs-layout'>)</span>
<a name="line-216"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>fullDesc</span>
<a name="line-217"></a> <span class='hs-varop'><></span> <span class='hs-varid'>progDesc</span> <span class='hs-str'>"Command-line diagram generation."</span>
<a name="line-218"></a> <span class='hs-varop'><></span> <span class='hs-varid'>header</span> <span class='hs-varid'>prog</span><span class='hs-layout'>)</span>
<a name="line-219"></a> <span class='hs-varid'>execParser</span> <span class='hs-varid'>p</span>
<a name="line-220"></a>
<a name="line-221"></a><a name="Parseable"></a><span class='hs-comment'>-- | Parseable instances give a command line parser for a type. If a custom</span>
<a name="line-222"></a><a name="Parseable"></a><span class='hs-comment'>-- parser for a common type is wanted a newtype wrapper could be used to make</span>
<a name="line-223"></a><a name="Parseable"></a><span class='hs-comment'>-- a new 'Parseable' instance. Notice that we do /not/ want as many</span>
<a name="line-224"></a><a name="Parseable"></a><span class='hs-comment'>-- instances as 'Read' because we want to limit ourselves to things that make</span>
<a name="line-225"></a><a name="Parseable"></a><span class='hs-comment'>-- sense to parse from the command line.</span>
<a name="line-226"></a><a name="Parseable"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Parseable</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-227"></a> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span>
<a name="line-228"></a>
<a name="line-229"></a><span class='hs-comment'>-- The following instance would overlap with the product instance for</span>
<a name="line-230"></a><span class='hs-comment'>-- Parseable. We can't tell if one wants to parse (a,b) as one argument or a</span>
<a name="line-231"></a><span class='hs-comment'>-- as one argument and b as another. Since this is the command line we almost</span>
<a name="line-232"></a><span class='hs-comment'>-- certainly want the latter. So we need to have less Read instances.</span>
<a name="line-233"></a><span class='hs-comment'>--</span>
<a name="line-234"></a><span class='hs-comment'>-- instance Read a => Parseable a where</span>
<a name="line-235"></a><span class='hs-comment'>-- parser = argument readMay mempty</span>
<a name="line-236"></a>
<a name="line-237"></a><a name="instance%20Parseable%20Int"></a><span class='hs-comment'>-- | Parse 'Int' according to its 'Read' instance.</span>
<a name="line-238"></a><a name="instance%20Parseable%20Int"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parseable</span> <span class='hs-conid'>Int</span> <span class='hs-keyword'>where</span>
<a name="line-239"></a> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>argument</span> <span class='hs-varid'>readMay</span> <span class='hs-varid'>mempty</span>
<a name="line-240"></a>
<a name="line-241"></a><a name="instance%20Parseable%20Double"></a><span class='hs-comment'>-- | Parse 'Double' according to its 'Read' instance.</span>
<a name="line-242"></a><a name="instance%20Parseable%20Double"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parseable</span> <span class='hs-conid'>Double</span> <span class='hs-keyword'>where</span>
<a name="line-243"></a> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>argument</span> <span class='hs-varid'>readMay</span> <span class='hs-varid'>mempty</span>
<a name="line-244"></a>
<a name="line-245"></a><a name="instance%20Parseable%20String"></a><span class='hs-comment'>-- | Parse a string by just accepting the given string.</span>
<a name="line-246"></a><a name="instance%20Parseable%20String"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parseable</span> <span class='hs-conid'>String</span> <span class='hs-keyword'>where</span>
<a name="line-247"></a> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>argument</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>mempty</span>
<a name="line-248"></a>
<a name="line-249"></a><a name="instance%20Parseable%20DiagramOpts"></a><span class='hs-comment'>-- | Parse 'DiagramOpts' using the 'diagramOpts' parser.</span>
<a name="line-250"></a><a name="instance%20Parseable%20DiagramOpts"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parseable</span> <span class='hs-conid'>DiagramOpts</span> <span class='hs-keyword'>where</span>
<a name="line-251"></a> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>diagramOpts</span>
<a name="line-252"></a>
<a name="line-253"></a><a name="instance%20Parseable%20DiagramMultiOpts"></a><span class='hs-comment'>-- | Parse 'DiagramMultiOpts' using the 'diagramMultiOpts' parser.</span>
<a name="line-254"></a><a name="instance%20Parseable%20DiagramMultiOpts"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parseable</span> <span class='hs-conid'>DiagramMultiOpts</span> <span class='hs-keyword'>where</span>
<a name="line-255"></a> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>diagramMultiOpts</span>
<a name="line-256"></a>
<a name="line-257"></a><a name="instance%20Parseable%20DiagramAnimOpts"></a><span class='hs-comment'>-- | Parse 'DiagramAnimOpts' using the 'diagramAnimOpts' parser.</span>
<a name="line-258"></a><a name="instance%20Parseable%20DiagramAnimOpts"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parseable</span> <span class='hs-conid'>DiagramAnimOpts</span> <span class='hs-keyword'>where</span>
<a name="line-259"></a> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>diagramAnimOpts</span>
<a name="line-260"></a>
<a name="line-261"></a><a name="instance%20Parseable%20DiagramLoopOpts"></a><span class='hs-comment'>-- | Parse 'DiagramLoopOpts' using the 'diagramLoopOpts' parser.</span>
<a name="line-262"></a><a name="instance%20Parseable%20DiagramLoopOpts"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parseable</span> <span class='hs-conid'>DiagramLoopOpts</span> <span class='hs-keyword'>where</span>
<a name="line-263"></a> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>diagramLoopOpts</span>
<a name="line-264"></a>
<a name="line-265"></a>
<a name="line-266"></a><a name="instance%20Parseable%20(Colour%20Double)"></a><span class='hs-comment'>-- | Parse @'Colour' Double@ as either a named color from "Data.Colour.Names"</span>
<a name="line-267"></a><a name="instance%20Parseable%20(Colour%20Double)"></a><span class='hs-comment'>-- or a hexadecimal color.</span>
<a name="line-268"></a><a name="instance%20Parseable%20(Colour%20Double)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parseable</span> <span class='hs-layout'>(</span><span class='hs-conid'>Colour</span> <span class='hs-conid'>Double</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-269"></a> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>argument</span> <span class='hs-layout'>(</span><span class='hs-varid'>liftA2</span> <span class='hs-layout'>(</span><span class='hs-varop'><|></span><span class='hs-layout'>)</span> <span class='hs-varid'>rc</span> <span class='hs-varid'>rh</span><span class='hs-layout'>)</span> <span class='hs-varid'>mempty</span>
<a name="line-270"></a> <span class='hs-keyword'>where</span>
<a name="line-271"></a> <span class='hs-varid'>rh</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>colorToSRGBA</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>readHexColor</span> <span class='hs-varid'>s</span>
<a name="line-272"></a> <span class='hs-varid'>rc</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readColourName</span> <span class='hs-varid'>s</span>
<a name="line-273"></a> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span><span class='hs-varid'>g</span><span class='hs-layout'>,</span><span class='hs-varid'>b</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'>sRGB</span> <span class='hs-varid'>r</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-comment'>-- TODO: this seems unfortunate. Should the alpha</span>
<a name="line-274"></a> <span class='hs-comment'>-- value be applied to the r g b values?</span>
<a name="line-275"></a>
<a name="line-276"></a><a name="instance%20Parseable%20(AlphaColour%20Double)"></a><span class='hs-comment'>-- | Parse @'AlphaColour' Double@ as either a named color from "Data.Colour.Names"</span>
<a name="line-277"></a><a name="instance%20Parseable%20(AlphaColour%20Double)"></a><span class='hs-comment'>-- or a hexadecimal color.</span>
<a name="line-278"></a><a name="instance%20Parseable%20(AlphaColour%20Double)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parseable</span> <span class='hs-layout'>(</span><span class='hs-conid'>AlphaColour</span> <span class='hs-conid'>Double</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-279"></a> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>argument</span> <span class='hs-layout'>(</span><span class='hs-varid'>liftA2</span> <span class='hs-layout'>(</span><span class='hs-varop'><|></span><span class='hs-layout'>)</span> <span class='hs-varid'>rc</span> <span class='hs-varid'>rh</span><span class='hs-layout'>)</span> <span class='hs-varid'>mempty</span>
<a name="line-280"></a> <span class='hs-keyword'>where</span>
<a name="line-281"></a> <span class='hs-varid'>rh</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readHexColor</span> <span class='hs-varid'>s</span>
<a name="line-282"></a> <span class='hs-varid'>rc</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>opaque</span> <span class='hs-varop'><$></span> <span class='hs-varid'>readColourName</span> <span class='hs-varid'>s</span>
<a name="line-283"></a>
<a name="line-284"></a><span class='hs-comment'>-- Addapted from the Clay.Color module of the clay package</span>
<a name="line-285"></a>
<a name="line-286"></a><a name="readHexColor"></a><span class='hs-comment'>-- | Parses a hexadecimal color. The string can start with @\"0x\"@ or @\"#\"@</span>
<a name="line-287"></a><span class='hs-comment'>-- or just be a string of hexadecimal values. If four or three digits are</span>
<a name="line-288"></a><span class='hs-comment'>-- given each digit is repeated to form a full 24 or 32 bit color. For</span>
<a name="line-289"></a><span class='hs-comment'>-- example, @\"0xfc4\"@ is the same as @\"0xffcc44\"@. When eight or six</span>
<a name="line-290"></a><span class='hs-comment'>-- digits are given each pair of digits is a color or alpha channel with the</span>
<a name="line-291"></a><span class='hs-comment'>-- order being red, green, blue, alpha.</span>
<a name="line-292"></a><span class='hs-definition'>readHexColor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>AlphaColour</span> <span class='hs-conid'>Double</span><span class='hs-layout'>)</span>
<a name="line-293"></a><span class='hs-definition'>readHexColor</span> <span class='hs-varid'>cs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>cs</span> <span class='hs-keyword'>of</span>
<a name="line-294"></a> <span class='hs-layout'>(</span><span class='hs-chr'>'0'</span><span class='hs-conop'>:</span><span class='hs-chr'>'x'</span><span class='hs-conop'>:</span><span class='hs-varid'>hs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>handle</span> <span class='hs-varid'>hs</span>
<a name="line-295"></a> <span class='hs-layout'>(</span><span class='hs-chr'>'#'</span><span class='hs-conop'>:</span><span class='hs-varid'>hs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>handle</span> <span class='hs-varid'>hs</span>
<a name="line-296"></a> <span class='hs-varid'>hs</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>handle</span> <span class='hs-varid'>hs</span>
<a name="line-297"></a> <span class='hs-keyword'>where</span>
<a name="line-298"></a> <span class='hs-varid'>handle</span> <span class='hs-varid'>hs</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>length</span> <span class='hs-varid'>hs</span> <span class='hs-varop'><=</span> <span class='hs-num'>8</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>all</span> <span class='hs-varid'>isHexDigit</span> <span class='hs-varid'>hs</span>
<a name="line-299"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>hs</span> <span class='hs-keyword'>of</span>
<a name="line-300"></a> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span><span class='hs-varid'>e</span><span class='hs-layout'>,</span><span class='hs-varid'>f</span><span class='hs-layout'>,</span><span class='hs-varid'>g</span><span class='hs-layout'>,</span><span class='hs-varid'>h</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>withOpacity</span> <span class='hs-varop'><$></span> <span class='hs-layout'>(</span><span class='hs-varid'>sRGB</span> <span class='hs-varop'><$></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varop'><*></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span> <span class='hs-varop'><*></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>e</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varop'><*></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>g</span> <span class='hs-varid'>h</span>
<a name="line-301"></a> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span><span class='hs-varid'>e</span><span class='hs-layout'>,</span><span class='hs-varid'>f</span> <span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>opaque</span> <span class='hs-varop'><$></span> <span class='hs-layout'>(</span><span class='hs-varid'>sRGB</span> <span class='hs-varop'><$></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varop'><*></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span> <span class='hs-varop'><*></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>e</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-302"></a> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>d</span> <span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>withOpacity</span> <span class='hs-varop'><$></span> <span class='hs-layout'>(</span><span class='hs-varid'>sRGB</span> <span class='hs-varop'><$></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>a</span> <span class='hs-varid'>a</span> <span class='hs-varop'><*></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>b</span> <span class='hs-varid'>b</span> <span class='hs-varop'><*></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>c</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varop'><*></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>d</span> <span class='hs-varid'>d</span>
<a name="line-303"></a> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>opaque</span> <span class='hs-varop'><$></span> <span class='hs-layout'>(</span><span class='hs-varid'>sRGB</span> <span class='hs-varop'><$></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>a</span> <span class='hs-varid'>a</span> <span class='hs-varop'><*></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>b</span> <span class='hs-varid'>b</span> <span class='hs-varop'><*></span> <span class='hs-varid'>hex</span> <span class='hs-varid'>c</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-304"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-305"></a> <span class='hs-varid'>handle</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-306"></a>
<a name="line-307"></a> <span class='hs-varid'>isHexDigit</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>c</span><span class='hs-varop'>||</span> <span class='hs-varid'>c</span> <span class='hs-varop'>`elem`</span> <span class='hs-str'>"abcdef"</span>
<a name="line-308"></a>
<a name="line-309"></a> <span class='hs-varid'>hex</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>/</span> <span class='hs-num'>255</span><span class='hs-layout'>)</span> <span class='hs-varop'><$></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>readHex</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span> <span class='hs-keyword'>of</span>
<a name="line-310"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>h</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'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>h</span>
<a name="line-311"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-312"></a>
<a name="line-313"></a>
<a name="line-314"></a><a name="instance%20Parseable%20()"></a><span class='hs-comment'>-- | This instance is needed to signal the end of a chain of</span>
<a name="line-315"></a><a name="instance%20Parseable%20()"></a><span class='hs-comment'>-- nested tuples, it always just results in the unit value</span>
<a name="line-316"></a><a name="instance%20Parseable%20()"></a><span class='hs-comment'>-- without consuming anything.</span>
<a name="line-317"></a><a name="instance%20Parseable%20()"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parseable</span> <span class='hs-conid'>()</span> <span class='hs-keyword'>where</span>
<a name="line-318"></a> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pure</span> <span class='hs-conid'>()</span>
<a name="line-319"></a>
<a name="line-320"></a><a name="instance%20Parseable%20(a,b)"></a><span class='hs-comment'>-- | Allow 'Parseable' things to be combined.</span>
<a name="line-321"></a><a name="instance%20Parseable%20(a,b)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Parseable</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Parseable</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parseable</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-322"></a> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>(,)</span> <span class='hs-varop'><$></span> <span class='hs-varid'>parser</span> <span class='hs-varop'><*></span> <span class='hs-varid'>parser</span>
<a name="line-323"></a>
<a name="line-324"></a>
<a name="line-325"></a><a name="ToResult"></a><span class='hs-comment'>-- | This class allows us to abstract over functions that take some arguments</span>
<a name="line-326"></a><a name="ToResult"></a><span class='hs-comment'>-- and produce a final value. When some @d@ is an instance of</span>
<a name="line-327"></a><a name="ToResult"></a><span class='hs-comment'>-- 'ToResult' we get a type @'Args' d@ that is a type of /all/ the arguments</span>
<a name="line-328"></a><a name="ToResult"></a><span class='hs-comment'>-- at once, and a type @'ResultOf' d@ that is the type of the final result from</span>
<a name="line-329"></a><a name="ToResult"></a><span class='hs-comment'>-- some base case instance.</span>
<a name="line-330"></a><a name="ToResult"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>ToResult</span> <span class='hs-varid'>d</span> <span class='hs-keyword'>where</span>
<a name="line-331"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>Args</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>*</span>
<a name="line-332"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>ResultOf</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>*</span>
<a name="line-333"></a>
<a name="line-334"></a> <span class='hs-varid'>toResult</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Args</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ResultOf</span> <span class='hs-varid'>d</span>
<a name="line-335"></a>
<a name="line-336"></a><a name="instance%20ToResult%20(Diagram%20b%20v)"></a><span class='hs-comment'>-- | A diagram can always produce a diagram when given @()@ as an argument.</span>
<a name="line-337"></a><a name="instance%20ToResult%20(Diagram%20b%20v)"></a><span class='hs-comment'>-- This is our base case.</span>
<a name="line-338"></a><a name="instance%20ToResult%20(Diagram%20b%20v)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ToResult</span> <span class='hs-layout'>(</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-339"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>Args</span> <span class='hs-layout'>(</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>()</span>
<a name="line-340"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>ResultOf</span> <span class='hs-layout'>(</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span>
<a name="line-341"></a>
<a name="line-342"></a> <span class='hs-varid'>toResult</span> <span class='hs-varid'>d</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>d</span>
<a name="line-343"></a>
<a name="line-344"></a><a name="instance%20ToResult%20%5bDiagram%20b%20v%5d"></a><span class='hs-comment'>-- | A list of diagrams can produce pages.</span>
<a name="line-345"></a><a name="instance%20ToResult%20%5bDiagram%20b%20v%5d"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ToResult</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span> <span class='hs-keyword'>where</span>
<a name="line-346"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>Args</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>()</span>
<a name="line-347"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>ResultOf</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span>
<a name="line-348"></a>
<a name="line-349"></a> <span class='hs-varid'>toResult</span> <span class='hs-varid'>ds</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ds</span>
<a name="line-350"></a>
<a name="line-351"></a><a name="instance%20ToResult%20%5b(String,Diagram%20b%20v)%5d"></a><span class='hs-comment'>-- | A list of named diagrams can give the multi-diagram interface.</span>
<a name="line-352"></a><a name="instance%20ToResult%20%5b(String,Diagram%20b%20v)%5d"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ToResult</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyword'>where</span>
<a name="line-353"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>Args</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>()</span>
<a name="line-354"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>ResultOf</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-355"></a>
<a name="line-356"></a> <span class='hs-varid'>toResult</span> <span class='hs-varid'>ds</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ds</span>
<a name="line-357"></a>
<a name="line-358"></a><a name="instance%20ToResult%20(Animation%20b%20v)"></a><span class='hs-comment'>-- | An animation is another suitable base case.</span>
<a name="line-359"></a><a name="instance%20ToResult%20(Animation%20b%20v)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ToResult</span> <span class='hs-layout'>(</span><span class='hs-conid'>Animation</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-360"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>Args</span> <span class='hs-layout'>(</span><span class='hs-conid'>Animation</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>()</span>
<a name="line-361"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>ResultOf</span> <span class='hs-layout'>(</span><span class='hs-conid'>Animation</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Animation</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span>
<a name="line-362"></a>
<a name="line-363"></a> <span class='hs-varid'>toResult</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-364"></a>
<a name="line-365"></a><a name="instance%20ToResult%20(IO%20d)"></a><span class='hs-comment'>-- | Diagrams that require IO to build are a base case.</span>
<a name="line-366"></a><a name="instance%20ToResult%20(IO%20d)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ToResult</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ToResult</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-367"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>Args</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Args</span> <span class='hs-varid'>d</span>
<a name="line-368"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>ResultOf</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResultOf</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-369"></a>
<a name="line-370"></a> <span class='hs-varid'>toResult</span> <span class='hs-varid'>d</span> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flip</span> <span class='hs-varid'>toResult</span> <span class='hs-varid'>args</span> <span class='hs-varop'><$></span> <span class='hs-varid'>d</span>
<a name="line-371"></a>
<a name="line-372"></a><span class='hs-comment'>-- | An instance for a function that, given some 'a', can produce a 'd' that is</span>
<a name="line-373"></a><span class='hs-comment'>-- also an instance of 'ToResult'. For this to work we need both the</span>
<a name="line-374"></a><span class='hs-comment'>-- argument 'a' and all the arguments that 'd' will need. Producing the</span>
<a name="line-375"></a><span class='hs-comment'>-- result is simply applying the argument to the producer and passing the</span>
<a name="line-376"></a><span class='hs-comment'>-- remaining arguments to the produced producer.</span>
<a name="line-377"></a>
<a name="line-378"></a><a name="instance%20ToResult%20(a%20-%3e%20d)"></a><span class='hs-comment'>-- The previous paragraph stands as a witness to the fact that Haskell code</span>
<a name="line-379"></a><a name="instance%20ToResult%20(a%20-%3e%20d)"></a><span class='hs-comment'>-- is clearer and easier to understand then paragraphs in English written by</span>
<a name="line-380"></a><a name="instance%20ToResult%20(a%20-%3e%20d)"></a><span class='hs-comment'>-- me.</span>
<a name="line-381"></a><a name="instance%20ToResult%20(a%20-%3e%20d)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ToResult</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ToResult</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-382"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>Args</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Args</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-383"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>ResultOf</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResultOf</span> <span class='hs-varid'>d</span>
<a name="line-384"></a>
<a name="line-385"></a> <span class='hs-varid'>toResult</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>args</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toResult</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>args</span>
<a name="line-386"></a>
<a name="line-387"></a>
<a name="line-388"></a><span class='hs-comment'>-- | This class represents the various ways we want to support diagram creation</span>
<a name="line-389"></a><span class='hs-comment'>-- from the command line. It has the right instances to select between creating</span>
<a name="line-390"></a><span class='hs-comment'>-- single static diagrams, multiple static diagrams, static animations, and</span>
<a name="line-391"></a><span class='hs-comment'>-- functions that produce diagrams as long as the arguments are 'Parseable'.</span>
<a name="line-392"></a><span class='hs-comment'>--</span>
<a name="line-393"></a><span class='hs-comment'>-- Backends are expected to create @Mainable@ instances for the types that are</span>
<a name="line-394"></a><span class='hs-comment'>-- suitable for generating output in the backend's format. For instance,</span>
<a name="line-395"></a><span class='hs-comment'>-- Postscript can handle single diagrams, pages of diagrams, animations as</span>
<a name="line-396"></a><span class='hs-comment'>-- separate files, and association lists. This implies instances for</span>
<a name="line-397"></a><span class='hs-comment'>-- @Diagram Postscript R2@, @[Diagram Postscript R2]@, @Animation Postscript R2@,</span>
<a name="line-398"></a><span class='hs-comment'>-- and @[(String,Diagram Postscript R2)]@. We can consider these as the base</span>
<a name="line-399"></a><span class='hs-comment'>-- cases for the function instance.</span>
<a name="line-400"></a><span class='hs-comment'>--</span>
<a name="line-401"></a><span class='hs-comment'>-- The associated type 'MainOpts' describes the options which need to be parsed</span>
<a name="line-402"></a><span class='hs-comment'>-- from the command-line and passed to @mainRender@.</span>
<a name="line-403"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Mainable</span> <span class='hs-varid'>d</span> <span class='hs-keyword'>where</span>
<a name="line-404"></a> <span class='hs-comment'>-- | Associated type that describes the options which need to be parsed</span>
<a name="line-405"></a> <span class='hs-comment'>-- from the command-line and passed to @mainRender@.</span>
<a name="line-406"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>MainOpts</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>*</span>
<a name="line-407"></a>
<a name="line-408"></a> <span class='hs-comment'>-- | This method invokes the command-line parser resulting in an options</span>
<a name="line-409"></a> <span class='hs-comment'>-- value or ending the program with an error or help message.</span>
<a name="line-410"></a> <span class='hs-comment'>-- Typically the default instance will work. If a different help message</span>
<a name="line-411"></a> <span class='hs-comment'>-- or parsing behavior is desired a new implementation is appropriate.</span>
<a name="line-412"></a> <span class='hs-comment'>--</span>
<a name="line-413"></a> <span class='hs-comment'>-- Note the @d@ argument should only be needed to fix the type @d@. Its</span>
<a name="line-414"></a> <span class='hs-comment'>-- value should not be relied on as a parameter.</span>
<a name="line-415"></a> <span class='hs-varid'>mainArgs</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parseable</span> <span class='hs-layout'>(</span><span class='hs-conid'>MainOpts</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>MainOpts</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-416"></a> <span class='hs-varid'>mainArgs</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultOpts</span> <span class='hs-varid'>parser</span>
<a name="line-417"></a>
<a name="line-418"></a> <span class='hs-comment'>-- | Backend specific work of rendering with the given options and mainable</span>
<a name="line-419"></a> <span class='hs-comment'>-- value is done here. All backend instances should implement this method.</span>
<a name="line-420"></a> <span class='hs-varid'>mainRender</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MainOpts</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-421"></a>
<a name="line-422"></a> <span class='hs-comment'>-- | Main entry point for command-line diagram creation. This is the method</span>
<a name="line-423"></a> <span class='hs-comment'>-- that users will call from their program @main@. For instance an expected</span>
<a name="line-424"></a> <span class='hs-comment'>-- user program would take the following form.</span>
<a name="line-425"></a> <span class='hs-comment'>--</span>
<a name="line-426"></a> <span class='hs-comment'>-- @</span>
<a name="line-427"></a> <span class='hs-comment'>-- import Diagrams.Prelude</span>
<a name="line-428"></a> <span class='hs-comment'>-- import Diagrams.Backend.TheBestBackend.CmdLine</span>
<a name="line-429"></a> <span class='hs-comment'>--</span>
<a name="line-430"></a> <span class='hs-comment'>-- d :: Diagram B R2</span>
<a name="line-431"></a> <span class='hs-comment'>-- d = ...</span>
<a name="line-432"></a> <span class='hs-comment'>--</span>
<a name="line-433"></a> <span class='hs-comment'>-- main = mainWith d</span>
<a name="line-434"></a> <span class='hs-comment'>-- @</span>
<a name="line-435"></a> <span class='hs-comment'>--</span>
<a name="line-436"></a> <span class='hs-comment'>-- Most backends should be able to use the default implementation. A different</span>
<a name="line-437"></a> <span class='hs-comment'>-- implementation should be used to handle more complex interactions with the user.</span>
<a name="line-438"></a> <span class='hs-varid'>mainWith</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parseable</span> <span class='hs-layout'>(</span><span class='hs-conid'>MainOpts</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-439"></a> <span class='hs-varid'>mainWith</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-440"></a> <span class='hs-varid'>opts</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mainArgs</span> <span class='hs-varid'>d</span>
<a name="line-441"></a> <span class='hs-varid'>mainRender</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>d</span>
<a name="line-442"></a>
<a name="line-443"></a><a name="instance%20Mainable%20(a%20-%3e%20d)"></a><span class='hs-comment'>-- | This instance allows functions resulting in something that is 'Mainable' to</span>
<a name="line-444"></a><a name="instance%20Mainable%20(a%20-%3e%20d)"></a><span class='hs-comment'>-- be 'Mainable'. It takes a parse of collected arguments and applies them to</span>
<a name="line-445"></a><a name="instance%20Mainable%20(a%20-%3e%20d)"></a><span class='hs-comment'>-- the given function producing the 'Mainable' result.</span>
<a name="line-446"></a><a name="instance%20Mainable%20(a%20-%3e%20d)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Parseable</span> <span class='hs-layout'>(</span><span class='hs-conid'>Args</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToResult</span> <span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-conid'>Mainable</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResultOf</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-447"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Mainable</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-448"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>MainOpts</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>MainOpts</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResultOf</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Args</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-449"></a>
<a name="line-450"></a> <span class='hs-varid'>mainRender</span> <span class='hs-layout'>(</span><span class='hs-varid'>opts</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mainRender</span> <span class='hs-varid'>opts</span> <span class='hs-layout'>(</span><span class='hs-varid'>toResult</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-451"></a><span class='hs-comment'>-- TODO: why can't we get away with: instance (Parseable (Args (a -> d)), Mainable (ResultOf d)) => ...</span>
<a name="line-452"></a><span class='hs-comment'>-- Doesn't `Args (a -> d)` imply `ToResult (a -> d)` which implies `ToResult d` ?</span>
<a name="line-453"></a>
<a name="line-454"></a><a name="instance%20Mainable%20(IO%20d)"></a><span class='hs-comment'>-- | With this instance we can perform IO to produce something</span>
<a name="line-455"></a><a name="instance%20Mainable%20(IO%20d)"></a><span class='hs-comment'>-- 'Mainable' before rendering.</span>
<a name="line-456"></a><a name="instance%20Mainable%20(IO%20d)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Mainable</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Mainable</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-457"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>MainOpts</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MainOpts</span> <span class='hs-varid'>d</span>
<a name="line-458"></a>
<a name="line-459"></a> <span class='hs-varid'>mainRender</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>dio</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dio</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>mainRender</span> <span class='hs-varid'>opts</span>
<a name="line-460"></a>
<a name="line-461"></a><a name="defaultMultiMainRender"></a><span class='hs-comment'>-- | @defaultMultiMainRender@ is an implementation of 'mainRender' where</span>
<a name="line-462"></a><span class='hs-comment'>-- instead of a single diagram it takes a list of diagrams paired with names</span>
<a name="line-463"></a><span class='hs-comment'>-- as input. The generated executable then takes a @--selection@ option</span>
<a name="line-464"></a><span class='hs-comment'>-- specifying the name of the diagram that should be rendered. The list of</span>
<a name="line-465"></a><span class='hs-comment'>-- available diagrams may also be printed by passing the option @--list@.</span>
<a name="line-466"></a><span class='hs-comment'>--</span>
<a name="line-467"></a><span class='hs-comment'>-- Typically a backend can write its @[(String,Diagram B V)]@ instance as</span>
<a name="line-468"></a><span class='hs-comment'>--</span>
<a name="line-469"></a><span class='hs-comment'>-- @</span>
<a name="line-470"></a><span class='hs-comment'>-- instance Mainable [(String,Diagram B V)] where</span>
<a name="line-471"></a><span class='hs-comment'>-- type MainOpts [(String,Diagram B V)] = (DiagramOpts, DiagramMultiOpts)</span>
<a name="line-472"></a><span class='hs-comment'>-- mainRender = defaultMultiMainRender</span>
<a name="line-473"></a><span class='hs-comment'>-- @</span>
<a name="line-474"></a><span class='hs-comment'>--</span>
<a name="line-475"></a><span class='hs-comment'>-- We do not provide this instance in general so that backends can choose to</span>
<a name="line-476"></a><span class='hs-comment'>-- opt-in to this form or provide a different instance that makes more sense.</span>
<a name="line-477"></a><span class='hs-definition'>defaultMultiMainRender</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Mainable</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-conid'>MainOpts</span> <span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-conid'>DiagramMultiOpts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-478"></a><span class='hs-definition'>defaultMultiMainRender</span> <span class='hs-layout'>(</span><span class='hs-varid'>opts</span><span class='hs-layout'>,</span><span class='hs-varid'>multi</span><span class='hs-layout'>)</span> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'>=</span>
<a name="line-479"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>multi</span><span class='hs-varop'>^.</span><span class='hs-varid'>list</span>
<a name="line-480"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>showDiaList</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>ds</span><span class='hs-layout'>)</span>
<a name="line-481"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>multi</span><span class='hs-varop'>^.</span><span class='hs-varid'>selection</span> <span class='hs-keyword'>of</span>
<a name="line-482"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>putStrLn</span> <span class='hs-str'>"No diagram selected."</span> <span class='hs-varop'>>></span> <span class='hs-varid'>showDiaList</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>ds</span><span class='hs-layout'>)</span>
<a name="line-483"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>sel</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookup</span> <span class='hs-varid'>sel</span> <span class='hs-varid'>ds</span> <span class='hs-keyword'>of</span>
<a name="line-484"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>putStrLn</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Unknown diagram: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>sel</span>
<a name="line-485"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mainRender</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>d</span>
<a name="line-486"></a>
<a name="line-487"></a><a name="showDiaList"></a><span class='hs-comment'>-- | Display the list of diagrams available for rendering.</span>
<a name="line-488"></a><span class='hs-definition'>showDiaList</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-489"></a><span class='hs-definition'>showDiaList</span> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-490"></a> <span class='hs-varid'>putStrLn</span> <span class='hs-str'>"Available diagrams:"</span>
<a name="line-491"></a> <span class='hs-varid'>putStrLn</span> <span class='hs-varop'>$</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-varid'>ds</span>
<a name="line-492"></a>
<a name="line-493"></a><a name="defaultAnimMainRender"></a><span class='hs-comment'>-- | @defaultAnimMainRender@ is an implementation of 'mainRender' which renders</span>
<a name="line-494"></a><span class='hs-comment'>-- an animation as numbered frames, named by extending the given output file</span>
<a name="line-495"></a><span class='hs-comment'>-- name by consecutive integers. For example if the given output file name is</span>
<a name="line-496"></a><span class='hs-comment'>-- @foo\/blah.ext@, the frames will be saved in @foo\/blah001.ext@,</span>
<a name="line-497"></a><span class='hs-comment'>-- @foo\/blah002.ext@, and so on (the number of padding digits used depends on</span>
<a name="line-498"></a><span class='hs-comment'>-- the total number of frames). It is up to the user to take these images and</span>
<a name="line-499"></a><span class='hs-comment'>-- stitch them together into an actual animation format (using, /e.g./</span>
<a name="line-500"></a><span class='hs-comment'>-- @ffmpeg@).</span>
<a name="line-501"></a><span class='hs-comment'>--</span>
<a name="line-502"></a><span class='hs-comment'>-- Of course, this is a rather crude method of rendering animations;</span>
<a name="line-503"></a><span class='hs-comment'>-- more sophisticated methods will likely be added in the future.</span>
<a name="line-504"></a><span class='hs-comment'>--</span>
<a name="line-505"></a><span class='hs-comment'>-- The @fpu@ option from 'DiagramAnimOpts' can be used to control how many frames will</span>
<a name="line-506"></a><span class='hs-comment'>-- be output for each second (unit time) of animation.</span>
<a name="line-507"></a><span class='hs-comment'>--</span>
<a name="line-508"></a><span class='hs-comment'>-- This function requires a lens into the structure that the particular backend</span>
<a name="line-509"></a><span class='hs-comment'>-- uses for it's diagram base case. If @MainOpts (Diagram b v) ~ DiagramOpts@</span>
<a name="line-510"></a><span class='hs-comment'>-- then this lens will simply be 'output'. For a backend supporting looping</span>
<a name="line-511"></a><span class='hs-comment'>-- it will most likely be @_1 . output@. This lens is required because the</span>
<a name="line-512"></a><span class='hs-comment'>-- implementation works by modifying the output field and running the base @mainRender@.</span>
<a name="line-513"></a><span class='hs-comment'>-- Typically a backend can write its @Animation B V@ instance as</span>
<a name="line-514"></a><span class='hs-comment'>--</span>
<a name="line-515"></a><span class='hs-comment'>-- @</span>
<a name="line-516"></a><span class='hs-comment'>-- instance Mainable (Animation B V) where</span>
<a name="line-517"></a><span class='hs-comment'>-- type MainOpts (Animation B V) = (DiagramOpts, DiagramAnimOpts)</span>
<a name="line-518"></a><span class='hs-comment'>-- mainRender = defaultAnimMainRender output</span>
<a name="line-519"></a><span class='hs-comment'>-- @</span>
<a name="line-520"></a><span class='hs-comment'>--</span>
<a name="line-521"></a><span class='hs-comment'>-- We do not provide this instance in general so that backends can choose to</span>
<a name="line-522"></a><span class='hs-comment'>-- opt-in to this form or provide a different instance that makes more sense.</span>
<a name="line-523"></a><span class='hs-definition'>defaultAnimMainRender</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Mainable</span> <span class='hs-layout'>(</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-524"></a> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-conid'>Lens'</span> <span class='hs-layout'>(</span><span class='hs-conid'>MainOpts</span> <span class='hs-layout'>(</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-conid'>FilePath</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ A lens into the output path.</span>
<a name="line-525"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>MainOpts</span> <span class='hs-layout'>(</span><span class='hs-conid'>Diagram</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-conid'>DiagramAnimOpts</span><span class='hs-layout'>)</span>
<a name="line-526"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Animation</span> <span class='hs-varid'>b</span> <span class='hs-varid'>v</span>
<a name="line-527"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-528"></a><span class='hs-definition'>defaultAnimMainRender</span> <span class='hs-varid'>out</span> <span class='hs-layout'>(</span><span class='hs-varid'>opts</span><span class='hs-layout'>,</span><span class='hs-varid'>animOpts</span><span class='hs-layout'>)</span> <span class='hs-varid'>anim</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-529"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>frames</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>simulate</span> <span class='hs-layout'>(</span><span class='hs-varid'>toRational</span> <span class='hs-varop'>$</span> <span class='hs-varid'>animOpts</span><span class='hs-varop'>^.</span><span class='hs-varid'>fpu</span><span class='hs-layout'>)</span> <span class='hs-varid'>anim</span>
<a name="line-530"></a> <span class='hs-varid'>nDigits</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varop'>.</span> <span class='hs-varid'>show</span> <span class='hs-varop'>.</span> <span class='hs-varid'>length</span> <span class='hs-varop'>$</span> <span class='hs-varid'>frames</span>
<a name="line-531"></a> <span class='hs-varid'>forM_</span> <span class='hs-layout'>(</span><span class='hs-varid'>zip</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>1</span><span class='hs-keyglyph'>..</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>frames</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-layout'>,</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mainRender</span> <span class='hs-layout'>(</span><span class='hs-varid'>indexize</span> <span class='hs-varid'>out</span> <span class='hs-varid'>nDigits</span> <span class='hs-varid'>i</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-varid'>d</span>
<a name="line-532"></a>
<a name="line-533"></a><a name="indexize"></a><span class='hs-comment'>-- | @indexize d n@ adds the integer index @n@ to the end of the</span>
<a name="line-534"></a><span class='hs-comment'>-- output file name, padding with zeros if necessary so that it uses</span>
<a name="line-535"></a><span class='hs-comment'>-- at least @d@ digits.</span>
<a name="line-536"></a><span class='hs-definition'>indexize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lens'</span> <span class='hs-varid'>s</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Integer</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span>
<a name="line-537"></a><span class='hs-definition'>indexize</span> <span class='hs-varid'>out</span> <span class='hs-varid'>nDigits</span> <span class='hs-varid'>i</span> <span class='hs-varid'>opts</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>opts</span> <span class='hs-varop'>&</span> <span class='hs-varid'>out</span> <span class='hs-varop'>.~</span> <span class='hs-varid'>output'</span>
<a name="line-538"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>fmt</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"%0"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>nDigits</span> <span class='hs-varop'>++</span> <span class='hs-str'>"d"</span>
<a name="line-539"></a> <span class='hs-varid'>output'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addExtension</span> <span class='hs-layout'>(</span><span class='hs-varid'>base</span> <span class='hs-varop'>++</span> <span class='hs-varid'>printf</span> <span class='hs-varid'>fmt</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-keyglyph'>::</span><span class='hs-conid'>Integer</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>ext</span>
<a name="line-540"></a> <span class='hs-layout'>(</span><span class='hs-varid'>base</span><span class='hs-layout'>,</span> <span class='hs-varid'>ext</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>splitExtension</span> <span class='hs-layout'>(</span><span class='hs-varid'>opts</span><span class='hs-varop'>^.</span><span class='hs-varid'>out</span><span class='hs-layout'>)</span>
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