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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>src/Graphics/Vty/Terminal/Generic.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>-- Copyright 2009-2011 Corey O'Connor</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE RankNTypes #-}</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE ScopedTypeVariables #-}</span>
<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE ExistentialQuantification #-}</span>
<a name="line-6"></a><span class='hs-comment'>{-# LANGUAGE GADTs #-}</span>
<a name="line-7"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-8"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Vty</span><span class='hs-varop'>.</span><span class='hs-conid'>Terminal</span><span class='hs-varop'>.</span><span class='hs-conid'>Generic</span> <span class='hs-layout'>(</span> <span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Vty</span><span class='hs-varop'>.</span><span class='hs-conid'>Terminal</span><span class='hs-varop'>.</span><span class='hs-conid'>Generic</span>
<a name="line-9"></a>                                     <span class='hs-layout'>,</span> <span class='hs-conid'>OutputBuffer</span>
<a name="line-10"></a>                                     <span class='hs-layout'>)</span>
<a name="line-11"></a>    <span class='hs-keyword'>where</span>
<a name="line-12"></a>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Marshalling</span>
<a name="line-14"></a>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Vty</span><span class='hs-varop'>.</span><span class='hs-conid'>Picture</span>
<a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Vty</span><span class='hs-varop'>.</span><span class='hs-conid'>Span</span>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Vty</span><span class='hs-varop'>.</span><span class='hs-conid'>DisplayRegion</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Vty</span><span class='hs-varop'>.</span><span class='hs-conid'>DisplayAttributes</span>
<a name="line-20"></a>
<a name="line-21"></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'>liftM</span> <span class='hs-layout'>)</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>BSCore</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>String</span><span class='hs-varop'>.</span><span class='hs-conid'>UTF8</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span> <span class='hs-varid'>foldl</span> <span class='hs-layout'>)</span>
<a name="line-27"></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'>Vector</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Vector</span> 
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span>
<a name="line-30"></a>
<a name="line-31"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>TerminalHandle</span> <span class='hs-keyword'>where</span>
<a name="line-32"></a>    <span class='hs-conid'>TerminalHandle</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Terminal</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IORef</span> <span class='hs-conid'>TerminalState</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>TerminalHandle</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="state_ref"></a><span class='hs-definition'>state_ref</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TerminalHandle</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IORef</span> <span class='hs-conid'>TerminalState</span>
<a name="line-35"></a><span class='hs-definition'>state_ref</span> <span class='hs-layout'>(</span><span class='hs-conid'>TerminalHandle</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>s_ref</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s_ref</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="new_terminal_handle"></a><span class='hs-definition'>new_terminal_handle</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>m</span> <span class='hs-varid'>t</span><span class='hs-varop'>.</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'>Terminal</span> <span class='hs-varid'>t</span> <span class='hs-layout'>)</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>TerminalHandle</span>
<a name="line-38"></a><span class='hs-definition'>new_terminal_handle</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-39"></a>    <span class='hs-varid'>s_ref</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>newIORef</span> <span class='hs-varid'>initial_terminal_state</span>
<a name="line-40"></a>    <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>TerminalHandle</span> <span class='hs-varid'>t</span> <span class='hs-varid'>s_ref</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="TerminalState"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>TerminalState</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TerminalState</span>
<a name="line-43"></a>    <span class='hs-layout'>{</span> <span class='hs-comment'>-- | The current terminal display attributes or Nothing if they are not known.</span>
<a name="line-44"></a>      <span class='hs-varid'>known_fattr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>FixedAttr</span>
<a name="line-45"></a>    <span class='hs-layout'>}</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="initial_terminal_state"></a><span class='hs-definition'>initial_terminal_state</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TerminalState</span>
<a name="line-48"></a><span class='hs-definition'>initial_terminal_state</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TerminalState</span> <span class='hs-conid'>Nothing</span>
<a name="line-49"></a>
<a name="line-50"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Terminal</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-51"></a>    <span class='hs-comment'>-- | Text identifier for the terminal. Used for debugging.</span>
<a name="line-52"></a>    <span class='hs-varid'>terminal_ID</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span>
<a name="line-53"></a>    <span class='hs-comment'>-- | </span>
<a name="line-54"></a>    <span class='hs-varid'>release_terminal</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-55"></a>    <span class='hs-comment'>-- | Clear the display and initialize the terminal to some initial display state. </span>
<a name="line-56"></a>    <span class='hs-comment'>--</span>
<a name="line-57"></a>    <span class='hs-comment'>-- The expectation of a program is that the display starts in some initial state. </span>
<a name="line-58"></a>    <span class='hs-comment'>-- The initial state would consist of fixed values:</span>
<a name="line-59"></a>    <span class='hs-comment'>--  - cursor at top left</span>
<a name="line-60"></a>    <span class='hs-comment'>--  - UTF-8 character encoding</span>
<a name="line-61"></a>    <span class='hs-comment'>--  - drawing characteristics are the default</span>
<a name="line-62"></a>    <span class='hs-comment'>-- The abstract operation I think all these behaviors are instances of is reserving exclusive</span>
<a name="line-63"></a>    <span class='hs-comment'>-- access to a display such that:</span>
<a name="line-64"></a>    <span class='hs-comment'>--  - The previous state cannot be determined</span>
<a name="line-65"></a>    <span class='hs-comment'>--  - When exclusive access to a display is release the display returns to the previous state.</span>
<a name="line-66"></a>    <span class='hs-varid'>reserve_display</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-67"></a>
<a name="line-68"></a>    <span class='hs-comment'>-- | Return the display to the state before reserve_display</span>
<a name="line-69"></a>    <span class='hs-comment'>-- If no previous state then set the display state to the initial state.</span>
<a name="line-70"></a>    <span class='hs-varid'>release_display</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-71"></a>    
<a name="line-72"></a>    <span class='hs-comment'>-- | Returns the current display bounds.</span>
<a name="line-73"></a>    <span class='hs-varid'>display_bounds</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>DisplayRegion</span>
<a name="line-74"></a>
<a name="line-75"></a>    <span class='hs-comment'>-- Internal method used to provide the DisplayTerminal instance to the DisplayHandle</span>
<a name="line-76"></a>    <span class='hs-comment'>-- constructor.</span>
<a name="line-77"></a>    <span class='hs-varid'>display_terminal_instance</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> 
<a name="line-78"></a>                              <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>t</span> 
<a name="line-79"></a>                              <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DisplayRegion</span> 
<a name="line-80"></a>                              <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>d</span><span class='hs-varop'>.</span> <span class='hs-conid'>DisplayTerminal</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DisplayHandle</span><span class='hs-layout'>)</span> 
<a name="line-81"></a>                              <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>DisplayHandle</span>
<a name="line-82"></a>
<a name="line-83"></a>    <span class='hs-comment'>-- | Output the byte buffer of the specified size to the terminal device.  The size is equal to</span>
<a name="line-84"></a>    <span class='hs-comment'>-- end_ptr - start_ptr</span>
<a name="line-85"></a>    <span class='hs-varid'>output_byte_buffer</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OutputBuffer</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-86"></a>
<a name="line-87"></a>    <span class='hs-comment'>-- | Handle of output device</span>
<a name="line-88"></a>    <span class='hs-varid'>output_handle</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Handle</span>
<a name="line-89"></a>
<a name="line-90"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Terminal</span> <span class='hs-conid'>TerminalHandle</span> <span class='hs-keyword'>where</span>
<a name="line-91"></a>    <span class='hs-varid'>terminal_ID</span> <span class='hs-layout'>(</span><span class='hs-conid'>TerminalHandle</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>terminal_ID</span> <span class='hs-varid'>t</span>
<a name="line-92"></a>    <span class='hs-varid'>release_terminal</span> <span class='hs-layout'>(</span><span class='hs-conid'>TerminalHandle</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>release_terminal</span> <span class='hs-varid'>t</span>
<a name="line-93"></a>    <span class='hs-varid'>reserve_display</span> <span class='hs-layout'>(</span><span class='hs-conid'>TerminalHandle</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reserve_display</span> <span class='hs-varid'>t</span>
<a name="line-94"></a>    <span class='hs-varid'>release_display</span> <span class='hs-layout'>(</span><span class='hs-conid'>TerminalHandle</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>release_display</span> <span class='hs-varid'>t</span>
<a name="line-95"></a>    <span class='hs-varid'>display_bounds</span> <span class='hs-layout'>(</span><span class='hs-conid'>TerminalHandle</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>display_bounds</span> <span class='hs-varid'>t</span>
<a name="line-96"></a>    <span class='hs-varid'>display_terminal_instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>TerminalHandle</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>display_terminal_instance</span> <span class='hs-varid'>t</span>
<a name="line-97"></a>    <span class='hs-varid'>output_byte_buffer</span> <span class='hs-layout'>(</span><span class='hs-conid'>TerminalHandle</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>output_byte_buffer</span> <span class='hs-varid'>t</span>
<a name="line-98"></a>    <span class='hs-varid'>output_handle</span> <span class='hs-layout'>(</span><span class='hs-conid'>TerminalHandle</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>output_handle</span> <span class='hs-varid'>t</span>
<a name="line-99"></a>
<a name="line-100"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DisplayHandle</span> <span class='hs-keyword'>where</span>
<a name="line-101"></a>    <span class='hs-conid'>DisplayHandle</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>d</span> <span class='hs-varop'>.</span> <span class='hs-conid'>DisplayTerminal</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>TerminalHandle</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DisplayState</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DisplayHandle</span>
<a name="line-102"></a>
<a name="line-103"></a><a name="display_context"></a><span class='hs-comment'>-- | Acquire display access to the given region of the display.</span>
<a name="line-104"></a><span class='hs-comment'>-- Currently all regions have the upper left corner of (0,0) and the lower right corner at </span>
<a name="line-105"></a><span class='hs-comment'>-- (max display_width provided_width, max display_height provided_height)</span>
<a name="line-106"></a><span class='hs-definition'>display_context</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>TerminalHandle</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DisplayRegion</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>DisplayHandle</span>
<a name="line-107"></a><span class='hs-definition'>display_context</span> <span class='hs-varid'>t</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-108"></a>    <span class='hs-varid'>s</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>initial_display_state</span>
<a name="line-109"></a>    <span class='hs-varid'>display_terminal_instance</span> <span class='hs-varid'>t</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</span> <span class='hs-varid'>t</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-110"></a>
<a name="line-111"></a><a name="DisplayState"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DisplayState</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DisplayState</span>
<a name="line-112"></a>    <span class='hs-layout'>{</span> <span class='hs-varid'>previous_output_ref</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IORef</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>DisplayOps</span><span class='hs-layout'>)</span>
<a name="line-113"></a>    <span class='hs-layout'>}</span>
<a name="line-114"></a>
<a name="line-115"></a><a name="initial_display_state"></a><span class='hs-definition'>initial_display_state</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>DisplayState</span>
<a name="line-116"></a><span class='hs-definition'>initial_display_state</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>DisplayState</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>Nothing</span>
<a name="line-117"></a>
<a name="line-118"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>DisplayTerminal</span> <span class='hs-varid'>d</span> <span class='hs-keyword'>where</span>
<a name="line-119"></a>    <span class='hs-comment'>-- | Provide the bounds of the display context. </span>
<a name="line-120"></a>    <span class='hs-varid'>context_region</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DisplayRegion</span>
<a name="line-121"></a>
<a name="line-122"></a>    <span class='hs-comment'>-- | Maximum number of colors supported by the context.</span>
<a name="line-123"></a>    <span class='hs-varid'>context_color_count</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span>
<a name="line-124"></a>
<a name="line-125"></a>    <span class='hs-comment'>--  | sets the output position to the specified row and column. Where the number of bytes</span>
<a name="line-126"></a>    <span class='hs-comment'>--  required for the control codes can be specified seperate from the actual byte sequence.</span>
<a name="line-127"></a>    <span class='hs-varid'>move_cursor_required_bytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span>
<a name="line-128"></a>    <span class='hs-varid'>serialize_move_cursor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OutputBuffer</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>OutputBuffer</span>
<a name="line-129"></a>
<a name="line-130"></a>    <span class='hs-varid'>show_cursor_required_bytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span>
<a name="line-131"></a>    <span class='hs-varid'>serialize_show_cursor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OutputBuffer</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>OutputBuffer</span>
<a name="line-132"></a>
<a name="line-133"></a>    <span class='hs-varid'>hide_cursor_required_bytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span>
<a name="line-134"></a>    <span class='hs-varid'>serialize_hide_cursor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OutputBuffer</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>OutputBuffer</span>
<a name="line-135"></a>
<a name="line-136"></a>    <span class='hs-comment'>--  | Assure the specified output attributes will be applied to all the following text until the</span>
<a name="line-137"></a>    <span class='hs-comment'>--  next output attribute change. Where the number of bytes required for the control codes can</span>
<a name="line-138"></a>    <span class='hs-comment'>--  be specified seperate from the actual byte sequence.  The required number of bytes must be</span>
<a name="line-139"></a>    <span class='hs-comment'>--  at least the maximum number of bytes required by any attribute changes.  The serialization</span>
<a name="line-140"></a>    <span class='hs-comment'>--  equations must provide the ptr to the next byte to be specified in the output buffer.</span>
<a name="line-141"></a>    <span class='hs-comment'>--</span>
<a name="line-142"></a>    <span class='hs-comment'>--  The currently applied display attributes are provided as well. The Attr data type can</span>
<a name="line-143"></a>    <span class='hs-comment'>--  specify the style or color should not be changed from the currently applied display</span>
<a name="line-144"></a>    <span class='hs-comment'>--  attributes. In order to support this the currently applied display attributes are required.</span>
<a name="line-145"></a>    <span class='hs-comment'>--  In addition it may be possible to optimize the state changes based off the currently applied</span>
<a name="line-146"></a>    <span class='hs-comment'>--  display attributes.</span>
<a name="line-147"></a>    <span class='hs-varid'>attr_required_bytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>FixedAttr</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Attr</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DisplayAttrDiff</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span>
<a name="line-148"></a>    <span class='hs-varid'>serialize_set_attr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>FixedAttr</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Attr</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DisplayAttrDiff</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OutputBuffer</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>OutputBuffer</span>
<a name="line-149"></a>
<a name="line-150"></a>    <span class='hs-comment'>-- | Reset the display attributes to the default display attributes</span>
<a name="line-151"></a>    <span class='hs-varid'>default_attr_required_bytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span>
<a name="line-152"></a>    <span class='hs-varid'>serialize_default_attr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OutputBuffer</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>OutputBuffer</span>
<a name="line-153"></a>
<a name="line-154"></a>    <span class='hs-comment'>-- | See Graphics.Vty.Terminal.XTermColor.inline_hack</span>
<a name="line-155"></a>    <span class='hs-varid'>inline_hack</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-156"></a>    <span class='hs-varid'>inline_hack</span> <span class='hs-sel'>_d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-157"></a>
<a name="line-158"></a>
<a name="line-159"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>DisplayTerminal</span> <span class='hs-conid'>DisplayHandle</span> <span class='hs-keyword'>where</span>
<a name="line-160"></a>    <span class='hs-varid'>context_region</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>context_region</span> <span class='hs-varid'>d</span>
<a name="line-161"></a>    <span class='hs-varid'>context_color_count</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>context_color_count</span> <span class='hs-varid'>d</span>
<a name="line-162"></a>    <span class='hs-varid'>move_cursor_required_bytes</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>move_cursor_required_bytes</span> <span class='hs-varid'>d</span>
<a name="line-163"></a>    <span class='hs-varid'>serialize_move_cursor</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>serialize_move_cursor</span> <span class='hs-varid'>d</span>
<a name="line-164"></a>    <span class='hs-varid'>show_cursor_required_bytes</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>show_cursor_required_bytes</span> <span class='hs-varid'>d</span>
<a name="line-165"></a>    <span class='hs-varid'>serialize_show_cursor</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>serialize_show_cursor</span> <span class='hs-varid'>d</span>
<a name="line-166"></a>    <span class='hs-varid'>hide_cursor_required_bytes</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>hide_cursor_required_bytes</span> <span class='hs-varid'>d</span>
<a name="line-167"></a>    <span class='hs-varid'>serialize_hide_cursor</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>serialize_hide_cursor</span> <span class='hs-varid'>d</span>
<a name="line-168"></a>    <span class='hs-varid'>attr_required_bytes</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>attr_required_bytes</span> <span class='hs-varid'>d</span>
<a name="line-169"></a>    <span class='hs-varid'>serialize_set_attr</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>serialize_set_attr</span> <span class='hs-varid'>d</span>
<a name="line-170"></a>    <span class='hs-varid'>default_attr_required_bytes</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>default_attr_required_bytes</span> <span class='hs-varid'>d</span>
<a name="line-171"></a>    <span class='hs-varid'>serialize_default_attr</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>serialize_default_attr</span> <span class='hs-varid'>d</span>
<a name="line-172"></a>    <span class='hs-varid'>inline_hack</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</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'>inline_hack</span> <span class='hs-varid'>d</span> 
<a name="line-173"></a>    
<a name="line-174"></a><a name="utf8_text_required_bytes"></a><span class='hs-comment'>-- | All terminals serialize UTF8 text to the terminal device exactly as serialized in memory.</span>
<a name="line-175"></a><span class='hs-definition'>utf8_text_required_bytes</span> <span class='hs-keyglyph'>::</span>  <span class='hs-conid'>UTF8</span> <span class='hs-conid'>BSCore</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span>
<a name="line-176"></a><span class='hs-definition'>utf8_text_required_bytes</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span>
<a name="line-177"></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-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>src_bytes_length</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BSCore</span><span class='hs-varop'>.</span><span class='hs-varid'>toForeignPtr</span> <span class='hs-layout'>(</span><span class='hs-varid'>toRep</span> <span class='hs-varid'>str</span><span class='hs-layout'>)</span>
<a name="line-178"></a>    <span class='hs-keyword'>in</span> <span class='hs-varid'>toEnum</span> <span class='hs-varid'>src_bytes_length</span>
<a name="line-179"></a>
<a name="line-180"></a><a name="serialize_utf8_text"></a><span class='hs-comment'>-- | All terminals serialize UTF8 text to the terminal device exactly as serialized in memory.</span>
<a name="line-181"></a><span class='hs-definition'>serialize_utf8_text</span>  <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>UTF8</span> <span class='hs-conid'>BSCore</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OutputBuffer</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>OutputBuffer</span>
<a name="line-182"></a><span class='hs-definition'>serialize_utf8_text</span> <span class='hs-varid'>str</span> <span class='hs-varid'>dest_ptr</span> <span class='hs-keyglyph'>=</span> 
<a name="line-183"></a>    <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>src_fptr</span><span class='hs-layout'>,</span> <span class='hs-varid'>src_ptr_offset</span><span class='hs-layout'>,</span> <span class='hs-varid'>src_bytes_length</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BSCore</span><span class='hs-varop'>.</span><span class='hs-varid'>toForeignPtr</span> <span class='hs-layout'>(</span><span class='hs-varid'>toRep</span> <span class='hs-varid'>str</span><span class='hs-layout'>)</span>
<a name="line-184"></a>    <span class='hs-keyword'>in</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>withForeignPtr</span> <span class='hs-varid'>src_fptr</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>src_ptr</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-185"></a>        <span class='hs-keyword'>let</span> <span class='hs-varid'>src_ptr'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>src_ptr</span> <span class='hs-varop'>`plusPtr`</span> <span class='hs-varid'>src_ptr_offset</span>
<a name="line-186"></a>        <span class='hs-conid'>BSCore</span><span class='hs-varop'>.</span><span class='hs-varid'>memcpy</span> <span class='hs-varid'>dest_ptr</span> <span class='hs-varid'>src_ptr'</span> <span class='hs-layout'>(</span><span class='hs-varid'>toEnum</span> <span class='hs-varid'>src_bytes_length</span><span class='hs-layout'>)</span> 
<a name="line-187"></a>        <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>dest_ptr</span> <span class='hs-varop'>`plusPtr`</span> <span class='hs-varid'>src_bytes_length</span><span class='hs-layout'>)</span>
<a name="line-188"></a>
<a name="line-189"></a>
<a name="line-190"></a><a name="output_picture"></a><span class='hs-comment'>-- | Displays the given `Picture`.</span>
<a name="line-191"></a><span class='hs-comment'>--</span>
<a name="line-192"></a><span class='hs-comment'>--      0. The image is cropped to the display size. </span>
<a name="line-193"></a><span class='hs-comment'>--</span>
<a name="line-194"></a><span class='hs-comment'>--      1. Converted into a sequence of attribute changes and text spans.</span>
<a name="line-195"></a><span class='hs-comment'>--      </span>
<a name="line-196"></a><span class='hs-comment'>--      2. The cursor is hidden.</span>
<a name="line-197"></a><span class='hs-comment'>--</span>
<a name="line-198"></a><span class='hs-comment'>--      3. Serialized to the display.</span>
<a name="line-199"></a><span class='hs-comment'>--</span>
<a name="line-200"></a><span class='hs-comment'>--      4. The cursor is then shown and positioned or kept hidden.</span>
<a name="line-201"></a><span class='hs-comment'>--</span>
<a name="line-202"></a><span class='hs-comment'>-- </span>
<a name="line-203"></a><span class='hs-comment'>-- todo: specify possible IO exceptions.</span>
<a name="line-204"></a><span class='hs-comment'>-- abstract from IO monad to a MonadIO instance.</span>
<a name="line-205"></a><span class='hs-definition'>output_picture</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>DisplayHandle</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Picture</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-206"></a><span class='hs-definition'>output_picture</span> <span class='hs-layout'>(</span><span class='hs-conid'>DisplayHandle</span> <span class='hs-varid'>d</span> <span class='hs-varid'>t</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>pic</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-207"></a>    <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>context_region</span> <span class='hs-varid'>d</span>
<a name="line-208"></a>    <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>ops</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>spans_for_pic</span> <span class='hs-varid'>pic</span> <span class='hs-varid'>r</span>
<a name="line-209"></a>    <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>initial_attr</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FixedAttr</span> <span class='hs-varid'>default_style_mask</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span>
<a name="line-210"></a>    <span class='hs-comment'>-- Diff the previous output against the requested output. Differences are currently on a per-row</span>
<a name="line-211"></a>    <span class='hs-comment'>-- basis.</span>
<a name="line-212"></a>    <span class='hs-varid'>diffs</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Bool</span><span class='hs-keyglyph'>]</span>
<a name="line-213"></a>        <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>liftIO</span> <span class='hs-layout'>(</span> <span class='hs-varid'>readIORef</span> <span class='hs-layout'>(</span><span class='hs-varid'>previous_output_ref</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-214"></a>            <span class='hs-varop'>&gt;&gt;=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>mprevious_ops</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>mprevious_ops</span> <span class='hs-keyword'>of</span>
<a name="line-215"></a>                <span class='hs-conid'>Nothing</span>      
<a name="line-216"></a>                    <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>replicate</span> <span class='hs-layout'>(</span> <span class='hs-varid'>fromEnum</span> <span class='hs-varop'>$</span> <span class='hs-varid'>region_height</span> <span class='hs-varop'>$</span> <span class='hs-varid'>effected_region</span> <span class='hs-varid'>ops</span> <span class='hs-layout'>)</span> 
<a name="line-217"></a>                                                   <span class='hs-conid'>True</span>
<a name="line-218"></a>                <span class='hs-conid'>Just</span> <span class='hs-varid'>previous_ops</span> 
<a name="line-219"></a>                    <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>effected_region</span> <span class='hs-varid'>previous_ops</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>effected_region</span> <span class='hs-varid'>ops</span>
<a name="line-220"></a>                            <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>replicate</span> <span class='hs-layout'>(</span> <span class='hs-varid'>fromEnum</span> <span class='hs-varop'>$</span> <span class='hs-varid'>region_height</span> <span class='hs-varop'>$</span> <span class='hs-varid'>effected_region</span> <span class='hs-varid'>ops</span> <span class='hs-layout'>)</span> 
<a name="line-221"></a>                                                    <span class='hs-conid'>True</span>
<a name="line-222"></a>                            <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>zipWith</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Vector</span><span class='hs-varop'>.</span><span class='hs-varid'>toList</span> <span class='hs-varop'>$</span> <span class='hs-varid'>display_ops</span> <span class='hs-varid'>previous_ops</span> <span class='hs-layout'>)</span> 
<a name="line-223"></a>                                                       <span class='hs-layout'>(</span> <span class='hs-conid'>Vector</span><span class='hs-varop'>.</span><span class='hs-varid'>toList</span> <span class='hs-varop'>$</span> <span class='hs-varid'>display_ops</span> <span class='hs-varid'>ops</span> <span class='hs-layout'>)</span>
<a name="line-224"></a>
<a name="line-225"></a>    <span class='hs-comment'>-- determine the number of bytes required to completely serialize the output ops.</span>
<a name="line-226"></a>    <span class='hs-keyword'>let</span> <span class='hs-varid'>total</span> <span class='hs-keyglyph'>=</span>   <span class='hs-varid'>hide_cursor_required_bytes</span> <span class='hs-varid'>d</span> 
<a name="line-227"></a>                <span class='hs-varop'>+</span> <span class='hs-varid'>default_attr_required_bytes</span> <span class='hs-varid'>d</span>
<a name="line-228"></a>                <span class='hs-varop'>+</span> <span class='hs-varid'>required_bytes</span> <span class='hs-varid'>d</span> <span class='hs-varid'>initial_attr</span> <span class='hs-varid'>diffs</span> <span class='hs-varid'>ops</span> 
<a name="line-229"></a>                <span class='hs-varop'>+</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>pic_cursor</span> <span class='hs-varid'>pic</span> <span class='hs-keyword'>of</span>
<a name="line-230"></a>                    <span class='hs-conid'>NoCursor</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-num'>0</span>
<a name="line-231"></a>                    <span class='hs-conid'>Cursor</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cursor_output_map</span> <span class='hs-varid'>ops</span> <span class='hs-varop'>$</span> <span class='hs-varid'>pic_cursor</span> <span class='hs-varid'>pic</span>
<a name="line-232"></a>		                      <span class='hs-layout'>(</span> <span class='hs-varid'>ox</span><span class='hs-layout'>,</span> <span class='hs-varid'>oy</span> <span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>char_to_output_pos</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span> <span class='hs-layout'>)</span>
<a name="line-233"></a>		                   <span class='hs-keyword'>in</span> <span class='hs-varid'>show_cursor_required_bytes</span> <span class='hs-varid'>d</span>
<a name="line-234"></a>                                      <span class='hs-varop'>+</span> <span class='hs-varid'>move_cursor_required_bytes</span> <span class='hs-varid'>d</span> <span class='hs-varid'>ox</span> <span class='hs-varid'>oy</span>
<a name="line-235"></a>
<a name="line-236"></a>    <span class='hs-comment'>-- ... then serialize</span>
<a name="line-237"></a>    <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>allocaBytes</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromEnum</span> <span class='hs-varid'>total</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>start_ptr</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-238"></a>        <span class='hs-varid'>ptr</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>serialize_hide_cursor</span> <span class='hs-varid'>d</span> <span class='hs-varid'>start_ptr</span>
<a name="line-239"></a>        <span class='hs-varid'>ptr'</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>serialize_default_attr</span> <span class='hs-varid'>d</span> <span class='hs-varid'>ptr</span>
<a name="line-240"></a>        <span class='hs-varid'>ptr''</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>serialize_output_ops</span> <span class='hs-varid'>d</span> <span class='hs-varid'>ptr'</span> <span class='hs-varid'>initial_attr</span> <span class='hs-varid'>diffs</span> <span class='hs-varid'>ops</span>
<a name="line-241"></a>        <span class='hs-varid'>end_ptr</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>pic_cursor</span> <span class='hs-varid'>pic</span> <span class='hs-keyword'>of</span>
<a name="line-242"></a>                        <span class='hs-conid'>NoCursor</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-varid'>ptr''</span>
<a name="line-243"></a>                        <span class='hs-conid'>Cursor</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-244"></a>                            <span class='hs-keyword'>let</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cursor_output_map</span> <span class='hs-varid'>ops</span> <span class='hs-varop'>$</span> <span class='hs-varid'>pic_cursor</span> <span class='hs-varid'>pic</span>
<a name="line-245"></a>                                <span class='hs-layout'>(</span><span class='hs-varid'>ox</span><span class='hs-layout'>,</span> <span class='hs-varid'>oy</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>char_to_output_pos</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-246"></a>                            <span class='hs-varid'>serialize_show_cursor</span> <span class='hs-varid'>d</span> <span class='hs-varid'>ptr''</span> <span class='hs-varop'>&gt;&gt;=</span> <span class='hs-varid'>serialize_move_cursor</span> <span class='hs-varid'>d</span> <span class='hs-varid'>ox</span> <span class='hs-varid'>oy</span>
<a name="line-247"></a>        <span class='hs-comment'>-- todo: How to handle exceptions?</span>
<a name="line-248"></a>        <span class='hs-keyword'>case</span> <span class='hs-varid'>end_ptr</span> <span class='hs-varop'>`minusPtr`</span> <span class='hs-varid'>start_ptr</span> <span class='hs-keyword'>of</span>
<a name="line-249"></a>            <span class='hs-varid'>count</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>count</span> <span class='hs-varop'>&lt;</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"End pointer before start of buffer."</span>
<a name="line-250"></a>                  <span class='hs-keyglyph'>|</span> <span class='hs-varid'>toEnum</span> <span class='hs-varid'>count</span> <span class='hs-varop'>&gt;</span> <span class='hs-varid'>total</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>fail</span> <span class='hs-varop'>$</span> <span class='hs-str'>"End pointer past end of buffer by "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>toEnum</span> <span class='hs-varid'>count</span> <span class='hs-comment'>-</span> <span class='hs-varid'>total</span><span class='hs-layout'>)</span>
<a name="line-251"></a>                  <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>output_byte_buffer</span> <span class='hs-varid'>t</span> <span class='hs-varid'>start_ptr</span> <span class='hs-layout'>(</span><span class='hs-varid'>toEnum</span> <span class='hs-varid'>count</span><span class='hs-layout'>)</span>
<a name="line-252"></a>        <span class='hs-comment'>-- Cache the output spans.</span>
<a name="line-253"></a>        <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>writeIORef</span> <span class='hs-layout'>(</span><span class='hs-varid'>previous_output_ref</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>ops</span><span class='hs-layout'>)</span>
<a name="line-254"></a>    <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-255"></a>
<a name="line-256"></a><a name="required_bytes"></a><span class='hs-definition'>required_bytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DisplayTerminal</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>FixedAttr</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Bool</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DisplayOps</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span>
<a name="line-257"></a><span class='hs-definition'>required_bytes</span> <span class='hs-varid'>d</span> <span class='hs-varid'>in_fattr</span> <span class='hs-varid'>diffs</span> <span class='hs-varid'>ops</span> <span class='hs-keyglyph'>=</span> 
<a name="line-258"></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'>n</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-conid'>Vector</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl'</span> <span class='hs-varid'>required_bytes'</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-varid'>in_fattr</span><span class='hs-layout'>,</span> <span class='hs-varid'>diffs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span> <span class='hs-varid'>display_ops</span> <span class='hs-varid'>ops</span> <span class='hs-layout'>)</span>
<a name="line-259"></a>    <span class='hs-keyword'>in</span> <span class='hs-varid'>n</span>
<a name="line-260"></a>    <span class='hs-keyword'>where</span> 
<a name="line-261"></a>        <span class='hs-varid'>required_bytes'</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>current_sum</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr</span><span class='hs-layout'>,</span> <span class='hs-conid'>True</span> <span class='hs-conop'>:</span> <span class='hs-varid'>diffs'</span><span class='hs-layout'>)</span> <span class='hs-varid'>span_ops</span>
<a name="line-262"></a>            <span class='hs-keyglyph'>=</span>   <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span_ops_required_bytes</span> <span class='hs-varid'>d</span> <span class='hs-varid'>y</span> <span class='hs-varid'>fattr</span> <span class='hs-varid'>span_ops</span> 
<a name="line-263"></a>                <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span> <span class='hs-varid'>y</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span> <span class='hs-varop'>+</span> <span class='hs-varid'>current_sum</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr'</span><span class='hs-layout'>,</span> <span class='hs-varid'>diffs'</span> <span class='hs-layout'>)</span>
<a name="line-264"></a>        <span class='hs-varid'>required_bytes'</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>current_sum</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span> <span class='hs-conop'>:</span> <span class='hs-varid'>diffs'</span><span class='hs-layout'>)</span> <span class='hs-sel'>_span_ops</span>
<a name="line-265"></a>            <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span> <span class='hs-varid'>y</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>current_sum</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr</span><span class='hs-layout'>,</span> <span class='hs-varid'>diffs'</span> <span class='hs-layout'>)</span>
<a name="line-266"></a>        <span class='hs-varid'>required_bytes'</span> <span class='hs-layout'>(</span><span class='hs-sel'>_y</span><span class='hs-layout'>,</span> <span class='hs-sel'>_current_sum</span><span class='hs-layout'>,</span> <span class='hs-sel'>_fattr</span><span class='hs-layout'>,</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>)</span> <span class='hs-sel'>_span_ops</span>
<a name="line-267"></a>            <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"shouldn't be possible"</span>
<a name="line-268"></a>
<a name="line-269"></a><a name="span_ops_required_bytes"></a><span class='hs-definition'>span_ops_required_bytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DisplayTerminal</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>FixedAttr</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>SpanOps</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>Word</span><span class='hs-layout'>,</span> <span class='hs-conid'>FixedAttr</span><span class='hs-layout'>)</span>
<a name="line-270"></a><span class='hs-definition'>span_ops_required_bytes</span> <span class='hs-varid'>d</span> <span class='hs-varid'>y</span> <span class='hs-varid'>in_fattr</span> <span class='hs-varid'>span_ops</span> <span class='hs-keyglyph'>=</span> 
<a name="line-271"></a>    <span class='hs-comment'>-- The first operation is to set the cursor to the start of the row</span>
<a name="line-272"></a>    <span class='hs-keyword'>let</span> <span class='hs-varid'>header_required_bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>move_cursor_required_bytes</span> <span class='hs-varid'>d</span> <span class='hs-num'>0</span> <span class='hs-varid'>y</span>
<a name="line-273"></a>    <span class='hs-comment'>-- then the span ops are serialized in the order specified</span>
<a name="line-274"></a>    <span class='hs-keyword'>in</span> <span class='hs-conid'>Vector</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl'</span> <span class='hs-layout'>(</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>current_sum</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr</span><span class='hs-layout'>)</span> <span class='hs-varid'>op</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span_op_required_bytes</span> <span class='hs-varid'>d</span> <span class='hs-varid'>fattr</span> <span class='hs-varid'>op</span> 
<a name="line-275"></a>                                                   <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-varop'>+</span> <span class='hs-varid'>current_sum</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr'</span><span class='hs-layout'>)</span> 
<a name="line-276"></a>                     <span class='hs-layout'>)</span> 
<a name="line-277"></a>                     <span class='hs-layout'>(</span><span class='hs-varid'>header_required_bytes</span><span class='hs-layout'>,</span> <span class='hs-varid'>in_fattr</span><span class='hs-layout'>)</span>
<a name="line-278"></a>                     <span class='hs-varid'>span_ops</span>
<a name="line-279"></a>
<a name="line-280"></a><a name="span_op_required_bytes"></a><span class='hs-definition'>span_op_required_bytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DisplayTerminal</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>FixedAttr</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>SpanOp</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>Word</span><span class='hs-layout'>,</span> <span class='hs-conid'>FixedAttr</span><span class='hs-layout'>)</span>
<a name="line-281"></a><span class='hs-definition'>span_op_required_bytes</span> <span class='hs-varid'>d</span> <span class='hs-varid'>fattr</span> <span class='hs-layout'>(</span><span class='hs-conid'>AttributeChange</span> <span class='hs-varid'>attr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> 
<a name="line-282"></a>    <span class='hs-keyword'>let</span> <span class='hs-varid'>attr'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>limit_attr_for_display</span> <span class='hs-varid'>d</span> <span class='hs-varid'>attr</span>
<a name="line-283"></a>        <span class='hs-varid'>diffs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>display_attr_diffs</span> <span class='hs-varid'>fattr</span> <span class='hs-varid'>fattr'</span>
<a name="line-284"></a>        <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>attr_required_bytes</span> <span class='hs-varid'>d</span> <span class='hs-varid'>fattr</span> <span class='hs-varid'>attr'</span> <span class='hs-varid'>diffs</span>
<a name="line-285"></a>        <span class='hs-varid'>fattr'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fix_display_attr</span> <span class='hs-varid'>fattr</span> <span class='hs-varid'>attr'</span>
<a name="line-286"></a>    <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr'</span><span class='hs-layout'>)</span>
<a name="line-287"></a><span class='hs-definition'>span_op_required_bytes</span> <span class='hs-sel'>_d</span> <span class='hs-varid'>fattr</span> <span class='hs-layout'>(</span><span class='hs-conid'>TextSpan</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>str</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>utf8_text_required_bytes</span> <span class='hs-varid'>str</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr</span><span class='hs-layout'>)</span>
<a name="line-288"></a>
<a name="line-289"></a><a name="serialize_output_ops"></a><span class='hs-definition'>serialize_output_ops</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'>DisplayTerminal</span> <span class='hs-varid'>d</span> <span class='hs-layout'>)</span>
<a name="line-290"></a>                        <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> 
<a name="line-291"></a>                        <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OutputBuffer</span> 
<a name="line-292"></a>                        <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>FixedAttr</span> 
<a name="line-293"></a>                        <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Bool</span><span class='hs-keyglyph'>]</span>
<a name="line-294"></a>                        <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>DisplayOps</span> 
<a name="line-295"></a>                        <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>OutputBuffer</span>
<a name="line-296"></a><span class='hs-definition'>serialize_output_ops</span> <span class='hs-varid'>d</span> <span class='hs-varid'>start_ptr</span> <span class='hs-varid'>in_fattr</span> <span class='hs-varid'>diffs</span> <span class='hs-varid'>ops</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-297"></a>    <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>end_ptr</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'>&lt;-</span> <span class='hs-conid'>Vector</span><span class='hs-varop'>.</span><span class='hs-varid'>foldM'</span> <span class='hs-varid'>serialize_output_ops'</span> 
<a name="line-298"></a>                              <span class='hs-layout'>(</span> <span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-varid'>start_ptr</span><span class='hs-layout'>,</span> <span class='hs-varid'>in_fattr</span><span class='hs-layout'>,</span> <span class='hs-varid'>diffs</span> <span class='hs-layout'>)</span> 
<a name="line-299"></a>                              <span class='hs-layout'>(</span> <span class='hs-varid'>display_ops</span> <span class='hs-varid'>ops</span> <span class='hs-layout'>)</span>
<a name="line-300"></a>    <span class='hs-varid'>return</span> <span class='hs-varid'>end_ptr</span>
<a name="line-301"></a>    <span class='hs-keyword'>where</span> 
<a name="line-302"></a>        <span class='hs-varid'>serialize_output_ops'</span> <span class='hs-layout'>(</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>out_ptr</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr</span><span class='hs-layout'>,</span> <span class='hs-conid'>True</span> <span class='hs-conop'>:</span> <span class='hs-varid'>diffs'</span> <span class='hs-layout'>)</span> <span class='hs-varid'>span_ops</span>
<a name="line-303"></a>            <span class='hs-keyglyph'>=</span>   <span class='hs-varid'>serialize_span_ops</span> <span class='hs-varid'>d</span> <span class='hs-varid'>y</span> <span class='hs-varid'>out_ptr</span> <span class='hs-varid'>fattr</span> <span class='hs-varid'>span_ops</span> 
<a name="line-304"></a>                <span class='hs-varop'>&gt;&gt;=</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>out_ptr'</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span> <span class='hs-varid'>y</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>out_ptr'</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr'</span><span class='hs-layout'>,</span> <span class='hs-varid'>diffs'</span> <span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-305"></a>        <span class='hs-varid'>serialize_output_ops'</span> <span class='hs-layout'>(</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>out_ptr</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span> <span class='hs-conop'>:</span> <span class='hs-varid'>diffs'</span> <span class='hs-layout'>)</span> <span class='hs-sel'>_span_ops</span>
<a name="line-306"></a>            <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span> <span class='hs-varid'>y</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>out_ptr</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr</span><span class='hs-layout'>,</span> <span class='hs-varid'>diffs'</span> <span class='hs-layout'>)</span>
<a name="line-307"></a>        <span class='hs-varid'>serialize_output_ops'</span> <span class='hs-layout'>(</span><span class='hs-sel'>_y</span><span class='hs-layout'>,</span> <span class='hs-sel'>_out_ptr</span><span class='hs-layout'>,</span> <span class='hs-sel'>_fattr</span><span class='hs-layout'>,</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>)</span> <span class='hs-sel'>_span_ops</span>
<a name="line-308"></a>            <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"shouldn't be possible"</span>
<a name="line-309"></a>
<a name="line-310"></a><a name="serialize_span_ops"></a><span class='hs-definition'>serialize_span_ops</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'>DisplayTerminal</span> <span class='hs-varid'>d</span> <span class='hs-layout'>)</span>
<a name="line-311"></a>                      <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> 
<a name="line-312"></a>                      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span> 
<a name="line-313"></a>                      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OutputBuffer</span> 
<a name="line-314"></a>                      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>FixedAttr</span> 
<a name="line-315"></a>                      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>SpanOps</span> 
<a name="line-316"></a>                      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>OutputBuffer</span><span class='hs-layout'>,</span> <span class='hs-conid'>FixedAttr</span><span class='hs-layout'>)</span>
<a name="line-317"></a><span class='hs-definition'>serialize_span_ops</span> <span class='hs-varid'>d</span> <span class='hs-varid'>y</span> <span class='hs-varid'>out_ptr</span> <span class='hs-varid'>in_fattr</span> <span class='hs-varid'>span_ops</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-318"></a>    <span class='hs-comment'>-- The first operation is to set the cursor to the start of the row</span>
<a name="line-319"></a>    <span class='hs-varid'>out_ptr'</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>serialize_move_cursor</span> <span class='hs-varid'>d</span> <span class='hs-num'>0</span> <span class='hs-varid'>y</span> <span class='hs-varid'>out_ptr</span>
<a name="line-320"></a>    <span class='hs-comment'>-- then the span ops are serialized in the order specified</span>
<a name="line-321"></a>    <span class='hs-conid'>Vector</span><span class='hs-varop'>.</span><span class='hs-varid'>foldM</span> <span class='hs-layout'>(</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>out_ptr''</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr</span><span class='hs-layout'>)</span> <span class='hs-varid'>op</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>serialize_span_op</span> <span class='hs-varid'>d</span> <span class='hs-varid'>op</span> <span class='hs-varid'>out_ptr''</span> <span class='hs-varid'>fattr</span> <span class='hs-layout'>)</span> 
<a name="line-322"></a>                 <span class='hs-layout'>(</span><span class='hs-varid'>out_ptr'</span><span class='hs-layout'>,</span> <span class='hs-varid'>in_fattr</span><span class='hs-layout'>)</span>
<a name="line-323"></a>                 <span class='hs-varid'>span_ops</span>
<a name="line-324"></a>
<a name="line-325"></a><a name="serialize_span_op"></a><span class='hs-definition'>serialize_span_op</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'>DisplayTerminal</span> <span class='hs-varid'>d</span> <span class='hs-layout'>)</span>
<a name="line-326"></a>                     <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> 
<a name="line-327"></a>                     <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>SpanOp</span> 
<a name="line-328"></a>                     <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>OutputBuffer</span> 
<a name="line-329"></a>                     <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>FixedAttr</span>
<a name="line-330"></a>                     <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>OutputBuffer</span><span class='hs-layout'>,</span> <span class='hs-conid'>FixedAttr</span><span class='hs-layout'>)</span>
<a name="line-331"></a><span class='hs-definition'>serialize_span_op</span> <span class='hs-varid'>d</span> <span class='hs-layout'>(</span><span class='hs-conid'>AttributeChange</span> <span class='hs-varid'>attr</span><span class='hs-layout'>)</span> <span class='hs-varid'>out_ptr</span> <span class='hs-varid'>fattr</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-332"></a>    <span class='hs-keyword'>let</span> <span class='hs-varid'>attr'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>limit_attr_for_display</span> <span class='hs-varid'>d</span> <span class='hs-varid'>attr</span>
<a name="line-333"></a>        <span class='hs-varid'>fattr'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fix_display_attr</span> <span class='hs-varid'>fattr</span> <span class='hs-varid'>attr'</span>
<a name="line-334"></a>        <span class='hs-varid'>diffs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>display_attr_diffs</span> <span class='hs-varid'>fattr</span> <span class='hs-varid'>fattr'</span>
<a name="line-335"></a>    <span class='hs-varid'>out_ptr'</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>serialize_set_attr</span> <span class='hs-varid'>d</span> <span class='hs-varid'>fattr</span> <span class='hs-varid'>attr'</span> <span class='hs-varid'>diffs</span> <span class='hs-varid'>out_ptr</span>
<a name="line-336"></a>    <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>out_ptr'</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr'</span><span class='hs-layout'>)</span>
<a name="line-337"></a><span class='hs-definition'>serialize_span_op</span> <span class='hs-sel'>_d</span> <span class='hs-layout'>(</span><span class='hs-conid'>TextSpan</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>str</span><span class='hs-layout'>)</span> <span class='hs-varid'>out_ptr</span> <span class='hs-varid'>fattr</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-338"></a>    <span class='hs-varid'>out_ptr'</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>serialize_utf8_text</span> <span class='hs-varid'>str</span> <span class='hs-varid'>out_ptr</span>
<a name="line-339"></a>    <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>out_ptr'</span><span class='hs-layout'>,</span> <span class='hs-varid'>fattr</span><span class='hs-layout'>)</span>
<a name="line-340"></a>
<a name="line-341"></a><a name="marshall_to_terminal"></a><span class='hs-definition'>marshall_to_terminal</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Terminal</span> <span class='hs-varid'>t</span> <span class='hs-layout'>)</span>
<a name="line-342"></a>                     <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-conid'>Word8</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-conid'>Word8</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-343"></a><span class='hs-definition'>marshall_to_terminal</span> <span class='hs-varid'>t</span> <span class='hs-varid'>c</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-344"></a>    <span class='hs-varid'>start_ptr</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>mallocBytes</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromEnum</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-345"></a>    <span class='hs-comment'>-- </span>
<a name="line-346"></a>    <span class='hs-comment'>-- todo: capture exceptions?</span>
<a name="line-347"></a>    <span class='hs-varid'>end_ptr</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>f</span> <span class='hs-varid'>start_ptr</span>
<a name="line-348"></a>    <span class='hs-keyword'>case</span> <span class='hs-varid'>end_ptr</span> <span class='hs-varop'>`minusPtr`</span> <span class='hs-varid'>start_ptr</span> <span class='hs-keyword'>of</span>
<a name="line-349"></a>        <span class='hs-varid'>count</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>count</span> <span class='hs-varop'>&lt;</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"End pointer before start pointer."</span>
<a name="line-350"></a>              <span class='hs-keyglyph'>|</span> <span class='hs-varid'>toEnum</span> <span class='hs-varid'>count</span> <span class='hs-varop'>&gt;</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>fail</span> <span class='hs-varop'>$</span> <span class='hs-str'>"End pointer past end of buffer by "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>toEnum</span> <span class='hs-varid'>count</span> <span class='hs-comment'>-</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-351"></a>              <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>output_byte_buffer</span> <span class='hs-varid'>t</span> <span class='hs-varid'>start_ptr</span> <span class='hs-layout'>(</span><span class='hs-varid'>toEnum</span> <span class='hs-varid'>count</span><span class='hs-layout'>)</span>
<a name="line-352"></a>    <span class='hs-varid'>free</span> <span class='hs-varid'>start_ptr</span>
<a name="line-353"></a>    <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-354"></a>
<a name="line-355"></a><a name="CursorOutputMap"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>CursorOutputMap</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CursorOutputMap</span>
<a name="line-356"></a>    <span class='hs-layout'>{</span> <span class='hs-varid'>char_to_output_pos</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Word</span><span class='hs-layout'>,</span> <span class='hs-conid'>Word</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>Word</span><span class='hs-layout'>,</span> <span class='hs-conid'>Word</span><span class='hs-layout'>)</span>
<a name="line-357"></a>    <span class='hs-layout'>}</span> 
<a name="line-358"></a>
<a name="line-359"></a><a name="cursor_output_map"></a><span class='hs-definition'>cursor_output_map</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DisplayOps</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Cursor</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>CursorOutputMap</span>
<a name="line-360"></a><span class='hs-definition'>cursor_output_map</span> <span class='hs-varid'>span_ops</span> <span class='hs-sel'>_cursor</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CursorOutputMap</span>
<a name="line-361"></a>    <span class='hs-layout'>{</span> <span class='hs-varid'>char_to_output_pos</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>cx</span><span class='hs-layout'>,</span> <span class='hs-varid'>cy</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>cursor_column_offset</span> <span class='hs-varid'>span_ops</span> <span class='hs-varid'>cx</span> <span class='hs-varid'>cy</span><span class='hs-layout'>,</span> <span class='hs-varid'>cy</span><span class='hs-layout'>)</span>
<a name="line-362"></a>    <span class='hs-layout'>}</span>
<a name="line-363"></a>
<a name="line-364"></a><a name="cursor_column_offset"></a><span class='hs-definition'>cursor_column_offset</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DisplayOps</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Word</span>
<a name="line-365"></a><span class='hs-definition'>cursor_column_offset</span> <span class='hs-varid'>span_ops</span> <span class='hs-varid'>cx</span> <span class='hs-varid'>cy</span> <span class='hs-keyglyph'>=</span>
<a name="line-366"></a>    <span class='hs-keyword'>let</span> <span class='hs-varid'>cursor_row_ops</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Vector</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-layout'>(</span><span class='hs-varid'>display_ops</span> <span class='hs-varid'>span_ops</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromEnum</span> <span class='hs-varid'>cy</span><span class='hs-layout'>)</span>
<a name="line-367"></a>        <span class='hs-layout'>(</span><span class='hs-varid'>out_offset</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> 
<a name="line-368"></a>            <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Vector</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl'</span> <span class='hs-layout'>(</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-varid'>current_cx</span><span class='hs-layout'>,</span> <span class='hs-varid'>done</span><span class='hs-layout'>)</span> <span class='hs-varid'>op</span> <span class='hs-keyglyph'>-&gt;</span> 
<a name="line-369"></a>                        <span class='hs-keyword'>if</span> <span class='hs-varid'>done</span> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-varid'>current_cx</span><span class='hs-layout'>,</span> <span class='hs-varid'>done</span><span class='hs-layout'>)</span> <span class='hs-keyword'>else</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>span_op_has_width</span> <span class='hs-varid'>op</span> <span class='hs-keyword'>of</span>
<a name="line-370"></a>                            <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-varid'>current_cx</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-371"></a>                            <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>cw</span><span class='hs-layout'>,</span> <span class='hs-varid'>ow</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>compare</span> <span class='hs-varid'>cx</span> <span class='hs-layout'>(</span><span class='hs-varid'>current_cx</span> <span class='hs-varop'>+</span> <span class='hs-varid'>cw</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-372"></a>                                    <span class='hs-conid'>GT</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span> <span class='hs-varid'>d</span> <span class='hs-varop'>+</span> <span class='hs-varid'>ow</span>
<a name="line-373"></a>                                          <span class='hs-layout'>,</span> <span class='hs-varid'>current_cx</span> <span class='hs-varop'>+</span> <span class='hs-varid'>cw</span>
<a name="line-374"></a>                                          <span class='hs-layout'>,</span> <span class='hs-conid'>False</span> 
<a name="line-375"></a>                                          <span class='hs-layout'>)</span>
<a name="line-376"></a>                                    <span class='hs-conid'>EQ</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span> <span class='hs-varid'>d</span> <span class='hs-varop'>+</span> <span class='hs-varid'>ow</span>
<a name="line-377"></a>                                          <span class='hs-layout'>,</span> <span class='hs-varid'>current_cx</span> <span class='hs-varop'>+</span> <span class='hs-varid'>cw</span>
<a name="line-378"></a>                                          <span class='hs-layout'>,</span> <span class='hs-conid'>True</span> 
<a name="line-379"></a>                                          <span class='hs-layout'>)</span>
<a name="line-380"></a>                                    <span class='hs-conid'>LT</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span> <span class='hs-varid'>d</span> <span class='hs-varop'>+</span> <span class='hs-varid'>columns_to_char_offset</span> <span class='hs-layout'>(</span><span class='hs-varid'>cx</span> <span class='hs-comment'>-</span> <span class='hs-varid'>current_cx</span><span class='hs-layout'>)</span> <span class='hs-varid'>op</span>
<a name="line-381"></a>                                          <span class='hs-layout'>,</span> <span class='hs-varid'>current_cx</span> <span class='hs-varop'>+</span> <span class='hs-varid'>cw</span>
<a name="line-382"></a>                                          <span class='hs-layout'>,</span> <span class='hs-conid'>True</span>
<a name="line-383"></a>                                          <span class='hs-layout'>)</span>
<a name="line-384"></a>                      <span class='hs-layout'>)</span>
<a name="line-385"></a>                      <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-386"></a>                      <span class='hs-varid'>cursor_row_ops</span>
<a name="line-387"></a>    <span class='hs-keyword'>in</span> <span class='hs-varid'>out_offset</span>
<a name="line-388"></a>
<a name="line-389"></a><a name="limit_attr_for_display"></a><span class='hs-definition'>limit_attr_for_display</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DisplayTerminal</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Attr</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Attr</span>
<a name="line-390"></a><span class='hs-definition'>limit_attr_for_display</span> <span class='hs-varid'>d</span> <span class='hs-varid'>attr</span> 
<a name="line-391"></a>    <span class='hs-keyglyph'>=</span> <span class='hs-varid'>attr</span> <span class='hs-layout'>{</span> <span class='hs-varid'>attr_fore_color</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>clamp_color</span> <span class='hs-varop'>$</span> <span class='hs-varid'>attr_fore_color</span> <span class='hs-varid'>attr</span>
<a name="line-392"></a>           <span class='hs-layout'>,</span> <span class='hs-varid'>attr_back_color</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>clamp_color</span> <span class='hs-varop'>$</span> <span class='hs-varid'>attr_back_color</span> <span class='hs-varid'>attr</span>
<a name="line-393"></a>           <span class='hs-layout'>}</span>
<a name="line-394"></a>    <span class='hs-keyword'>where</span>
<a name="line-395"></a>        <span class='hs-varid'>clamp_color</span> <span class='hs-conid'>Default</span>     <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Default</span>
<a name="line-396"></a>        <span class='hs-varid'>clamp_color</span> <span class='hs-conid'>KeepCurrent</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>KeepCurrent</span>
<a name="line-397"></a>        <span class='hs-varid'>clamp_color</span> <span class='hs-layout'>(</span><span class='hs-conid'>SetTo</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>   <span class='hs-keyglyph'>=</span> <span class='hs-varid'>clamp_color'</span> <span class='hs-varid'>c</span>
<a name="line-398"></a>        <span class='hs-varid'>clamp_color'</span> <span class='hs-layout'>(</span><span class='hs-conid'>ISOColor</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> 
<a name="line-399"></a>            <span class='hs-keyglyph'>|</span> <span class='hs-varid'>context_color_count</span> <span class='hs-varid'>d</span> <span class='hs-varop'>&lt;</span> <span class='hs-num'>8</span>            <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Default</span>
<a name="line-400"></a>            <span class='hs-keyglyph'>|</span> <span class='hs-varid'>context_color_count</span> <span class='hs-varid'>d</span> <span class='hs-varop'>&lt;</span> <span class='hs-num'>16</span> <span class='hs-varop'>&amp;&amp;</span> <span class='hs-varid'>v</span> <span class='hs-varop'>&gt;=</span> <span class='hs-num'>8</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SetTo</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ISOColor</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span> <span class='hs-comment'>-</span> <span class='hs-num'>8</span><span class='hs-layout'>)</span>
<a name="line-401"></a>            <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>                            <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SetTo</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ISOColor</span> <span class='hs-varid'>v</span>
<a name="line-402"></a>        <span class='hs-varid'>clamp_color'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Color240</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span>
<a name="line-403"></a>            <span class='hs-comment'>-- TODO: Choose closes ISO color?</span>
<a name="line-404"></a>            <span class='hs-keyglyph'>|</span> <span class='hs-varid'>context_color_count</span> <span class='hs-varid'>d</span> <span class='hs-varop'>&lt;</span> <span class='hs-num'>8</span>            <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Default</span>
<a name="line-405"></a>            <span class='hs-keyglyph'>|</span> <span class='hs-varid'>context_color_count</span> <span class='hs-varid'>d</span> <span class='hs-varop'>&lt;</span> <span class='hs-num'>16</span>           <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Default</span>
<a name="line-406"></a>            <span class='hs-keyglyph'>|</span> <span class='hs-varid'>context_color_count</span> <span class='hs-varid'>d</span> <span class='hs-varop'>==</span> <span class='hs-num'>240</span>         <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SetTo</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Color240</span> <span class='hs-varid'>v</span>
<a name="line-407"></a>            <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> 
<a name="line-408"></a>                <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>v</span> <span class='hs-varop'>/</span> <span class='hs-num'>240.0</span> 
<a name="line-409"></a>                      <span class='hs-varid'>v'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>floor</span> <span class='hs-varop'>$</span> <span class='hs-varid'>p</span> <span class='hs-varop'>*</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>context_color_count</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-410"></a>                  <span class='hs-keyword'>in</span> <span class='hs-conid'>SetTo</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Color240</span> <span class='hs-varid'>v'</span>
<a name="line-411"></a>
</pre></body>
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