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<title>System/Console/CmdArgs/Explicit/SplitJoin.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE RecordWildCards #-}</span>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Console</span><span class='hs-varop'>.</span><span class='hs-conid'>CmdArgs</span><span class='hs-varop'>.</span><span class='hs-conid'>Explicit</span><span class='hs-varop'>.</span><span class='hs-conid'>SplitJoin</span><span class='hs-layout'>(</span><span class='hs-varid'>splitArgs</span><span class='hs-layout'>,</span> <span class='hs-varid'>joinArgs</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span>
<a name="line-5"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span>
<a name="line-6"></a>
<a name="line-7"></a>
<a name="line-8"></a><a name="joinArgs"></a><span class='hs-comment'>-- | Given a sequence of arguments, join them together in a manner that could be used on</span>
<a name="line-9"></a><span class='hs-comment'>-- the command line, giving preference to the Windows @cmd@ shell quoting conventions.</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- For an alternative version, intended for actual running the result in a shell, see "System.Process.showCommandForUser"</span>
<a name="line-12"></a><span class='hs-definition'>joinArgs</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-13"></a><span class='hs-definition'>joinArgs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unwords</span> <span class='hs-varop'>.</span> <span class='hs-varid'>map</span> <span class='hs-varid'>f</span>
<a name="line-14"></a> <span class='hs-keyword'>where</span>
<a name="line-15"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>q</span> <span class='hs-varop'>++</span> <span class='hs-varid'>g</span> <span class='hs-varid'>x</span> <span class='hs-varop'>++</span> <span class='hs-varid'>q</span>
<a name="line-16"></a> <span class='hs-keyword'>where</span>
<a name="line-17"></a> <span class='hs-varid'>hasSpace</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>any</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>x</span>
<a name="line-18"></a> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-chr'>'\"'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>hasSpace</span> <span class='hs-varop'>||</span> <span class='hs-varid'>null</span> <span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-19"></a>
<a name="line-20"></a> <span class='hs-varid'>g</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span> <span class='hs-varid'>g</span> <span class='hs-varid'>xs</span>
<a name="line-21"></a> <span class='hs-varid'>g</span> <span class='hs-str'>"\\"</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>hasSpace</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"\\\\"</span>
<a name="line-22"></a> <span class='hs-varid'>g</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span> <span class='hs-varid'>g</span> <span class='hs-varid'>xs</span>
<a name="line-23"></a> <span class='hs-varid'>g</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>g</span> <span class='hs-varid'>xs</span>
<a name="line-24"></a> <span class='hs-varid'>g</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-25"></a>
<a name="line-26"></a>
<a name="line-27"></a><a name="State"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>State</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Init</span> <span class='hs-comment'>-- either I just started, or just emitted something</span>
<a name="line-28"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Norm</span> <span class='hs-comment'>-- I'm seeing characters</span>
<a name="line-29"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Quot</span> <span class='hs-comment'>-- I've seen a quote</span>
<a name="line-30"></a>
<a name="line-31"></a><a name="splitArgs"></a><span class='hs-comment'>-- | Given a string, split into the available arguments. The inverse of 'joinArgs'.</span>
<a name="line-32"></a><span class='hs-definition'>splitArgs</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-33"></a><span class='hs-definition'>splitArgs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>join</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span> <span class='hs-conid'>Init</span>
<a name="line-34"></a> <span class='hs-keyword'>where</span>
<a name="line-35"></a> <span class='hs-comment'>-- Nothing is start a new string</span>
<a name="line-36"></a> <span class='hs-comment'>-- Just x is accumulate onto the existing string</span>
<a name="line-37"></a> <span class='hs-varid'>join</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-38"></a> <span class='hs-varid'>join</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-39"></a> <span class='hs-varid'>join</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fromJust</span> <span class='hs-varid'>a</span> <span class='hs-conop'>:</span> <span class='hs-varid'>join</span> <span class='hs-layout'>(</span><span class='hs-varid'>drop</span> <span class='hs-num'>1</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-40"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>break</span> <span class='hs-varid'>isNothing</span> <span class='hs-varid'>xs</span>
<a name="line-41"></a>
<a name="line-42"></a> <span class='hs-varid'>f</span> <span class='hs-conid'>Init</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-conid'>Init</span> <span class='hs-varid'>xs</span>
<a name="line-43"></a> <span class='hs-varid'>f</span> <span class='hs-conid'>Init</span> <span class='hs-str'>"\"\""</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Nothing</span><span class='hs-keyglyph'>]</span>
<a name="line-44"></a> <span class='hs-varid'>f</span> <span class='hs-conid'>Init</span> <span class='hs-str'>"\""</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Nothing</span><span class='hs-keyglyph'>]</span>
<a name="line-45"></a> <span class='hs-varid'>f</span> <span class='hs-conid'>Init</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-conid'>Norm</span> <span class='hs-varid'>xs</span>
<a name="line-46"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-chr'>'\"'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-varid'>xs</span>
<a name="line-47"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-chr'>'\"'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-varid'>xs</span>
<a name="line-48"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-chr'>'\\'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-49"></a> <span class='hs-varid'>f</span> <span class='hs-conid'>Norm</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-conid'>Quot</span> <span class='hs-varid'>xs</span>
<a name="line-50"></a> <span class='hs-varid'>f</span> <span class='hs-conid'>Quot</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-chr'>'\"'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>f</span> <span class='hs-conid'>Norm</span> <span class='hs-varid'>xs</span>
<a name="line-51"></a> <span class='hs-varid'>f</span> <span class='hs-conid'>Quot</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\"'</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-conid'>Norm</span> <span class='hs-varid'>xs</span>
<a name="line-52"></a> <span class='hs-varid'>f</span> <span class='hs-conid'>Norm</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span> <span class='hs-conop'>:</span> <span class='hs-varid'>f</span> <span class='hs-conid'>Init</span> <span class='hs-varid'>xs</span>
<a name="line-53"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-varid'>xs</span>
<a name="line-54"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
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