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<pre><a name="line-1"></a><span class='hs-comment'>{- |
<a name="line-2"></a>Module : XMonad.Prompt.Shell
<a name="line-3"></a>Copyright : (C) 2007 Andrea Rossato
<a name="line-4"></a>License : BSD3
<a name="line-5"></a>
<a name="line-6"></a>Maintainer : andrea.rossato@unibz.it
<a name="line-7"></a>Stability : unstable
<a name="line-8"></a>Portability : unportable
<a name="line-9"></a>
<a name="line-10"></a>A shell prompt for XMonad
<a name="line-11"></a>-}</span>
<a name="line-12"></a>
<a name="line-13"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Prompt</span><span class='hs-varop'>.</span><span class='hs-conid'>Shell</span>
<a name="line-14"></a> <span class='hs-layout'>(</span> <span class='hs-comment'>-- * Usage</span>
<a name="line-15"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-16"></a> <span class='hs-conid'>Shell</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>shellPrompt</span>
<a name="line-18"></a> <span class='hs-comment'>-- ** Variations on shellPrompt</span>
<a name="line-19"></a> <span class='hs-comment'>-- $spawns</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>prompt</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>safePrompt</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unsafePrompt</span>
<a name="line-23"></a>
<a name="line-24"></a> <span class='hs-comment'>-- * Utility functions</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>getCommands</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>getBrowser</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>getEditor</span>
<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>getShellCompl</span>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>split</span>
<a name="line-30"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Codec</span><span class='hs-varop'>.</span><span class='hs-conid'>Binary</span><span class='hs-varop'>.</span><span class='hs-conid'>UTF8</span><span class='hs-varop'>.</span><span class='hs-conid'>String</span> <span class='hs-layout'>(</span><span class='hs-varid'>encodeString</span><span class='hs-layout'>)</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>E</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-varid'>forM</span><span class='hs-layout'>)</span>
<a name="line-35"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span><span class='hs-varid'>isPrefixOf</span><span class='hs-layout'>)</span>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Directory</span> <span class='hs-layout'>(</span><span class='hs-varid'>doesDirectoryExist</span><span class='hs-layout'>,</span> <span class='hs-varid'>getDirectoryContents</span><span class='hs-layout'>)</span>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Environment</span> <span class='hs-layout'>(</span><span class='hs-varid'>getEnv</span><span class='hs-layout'>)</span>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>Files</span> <span class='hs-layout'>(</span><span class='hs-varid'>getFileStatus</span><span class='hs-layout'>,</span> <span class='hs-varid'>isDirectory</span><span class='hs-layout'>)</span>
<a name="line-39"></a>
<a name="line-40"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>config</span><span class='hs-layout'>)</span>
<a name="line-41"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Prompt</span>
<a name="line-42"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Util</span><span class='hs-varop'>.</span><span class='hs-conid'>Run</span>
<a name="line-43"></a>
<a name="line-44"></a><a name="econst"></a><span class='hs-definition'>econst</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IOException</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-45"></a><span class='hs-definition'>econst</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>const</span> <span class='hs-varop'>.</span> <span class='hs-varid'>return</span>
<a name="line-46"></a>
<a name="line-47"></a><span class='hs-comment'>{- $usage
<a name="line-48"></a>1. In your @~\/.xmonad\/xmonad.hs@:
<a name="line-49"></a>
<a name="line-50"></a>> import XMonad.Prompt
<a name="line-51"></a>> import XMonad.Prompt.Shell
<a name="line-52"></a>
<a name="line-53"></a>2. In your keybindings add something like:
<a name="line-54"></a>
<a name="line-55"></a>> , ((modm .|. controlMask, xK_x), shellPrompt defaultXPConfig)
<a name="line-56"></a>
<a name="line-57"></a>For detailed instruction on editing the key binding see
<a name="line-58"></a>"XMonad.Doc.Extending#Editing_key_bindings". -}</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="Shell"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Shell</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Shell</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="instance%20XPrompt%20Shell"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>XPrompt</span> <span class='hs-conid'>Shell</span> <span class='hs-keyword'>where</span>
<a name="line-63"></a> <span class='hs-varid'>showXPrompt</span> <span class='hs-conid'>Shell</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Run: "</span>
<a name="line-64"></a> <span class='hs-varid'>completionToCommand</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>escape</span>
<a name="line-65"></a>
<a name="line-66"></a><a name="shellPrompt"></a><span class='hs-definition'>shellPrompt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>XPConfig</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-67"></a><span class='hs-definition'>shellPrompt</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-68"></a> <span class='hs-varid'>cmds</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>io</span> <span class='hs-varid'>getCommands</span>
<a name="line-69"></a> <span class='hs-varid'>mkXPrompt</span> <span class='hs-conid'>Shell</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>getShellCompl</span> <span class='hs-varid'>cmds</span><span class='hs-layout'>)</span> <span class='hs-varid'>spawn</span>
<a name="line-70"></a>
<a name="line-71"></a><span class='hs-comment'>{- $spawns
<a name="line-72"></a> See safe and unsafeSpawn in "XMonad.Util.Run".
<a name="line-73"></a> prompt is an alias for safePrompt;
<a name="line-74"></a> safePrompt and unsafePrompt work on the same principles, but will use
<a name="line-75"></a> XPrompt to interactively query the user for input; the appearance is
<a name="line-76"></a> set by passing an XPConfig as the second argument. The first argument
<a name="line-77"></a> is the program to be run with the interactive input.
<a name="line-78"></a> You would use these like this:
<a name="line-79"></a>
<a name="line-80"></a> > , ((modm, xK_b), safePrompt "firefox" greenXPConfig)
<a name="line-81"></a> > , ((modm .|. shiftMask, xK_c), prompt ("xterm" ++ " -e") greenXPConfig)
<a name="line-82"></a>
<a name="line-83"></a> Note that you want to use safePrompt for Firefox input, as Firefox
<a name="line-84"></a> wants URLs, and unsafePrompt for the XTerm example because this allows
<a name="line-85"></a> you to easily start a terminal executing an arbitrary command, like
<a name="line-86"></a> 'top'. -}</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="prompt"></a><span class='hs-definition'>prompt</span><span class='hs-layout'>,</span> <span class='hs-varid'>unsafePrompt</span><span class='hs-layout'>,</span> <span class='hs-varid'>safePrompt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>XPConfig</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-89"></a><span class='hs-definition'>prompt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePrompt</span>
<a name="line-90"></a><a name="safePrompt"></a><span class='hs-definition'>safePrompt</span> <span class='hs-varid'>c</span> <span class='hs-varid'>config</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkXPrompt</span> <span class='hs-conid'>Shell</span> <span class='hs-varid'>config</span> <span class='hs-layout'>(</span><span class='hs-varid'>getShellCompl</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-varid'>run</span>
<a name="line-91"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>run</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>safeSpawn</span> <span class='hs-varid'>c</span> <span class='hs-varop'>.</span> <span class='hs-varid'>return</span>
<a name="line-92"></a><a name="unsafePrompt"></a><span class='hs-definition'>unsafePrompt</span> <span class='hs-varid'>c</span> <span class='hs-varid'>config</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkXPrompt</span> <span class='hs-conid'>Shell</span> <span class='hs-varid'>config</span> <span class='hs-layout'>(</span><span class='hs-varid'>getShellCompl</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-varid'>run</span>
<a name="line-93"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>run</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafeSpawn</span> <span class='hs-varop'>$</span> <span class='hs-varid'>c</span> <span class='hs-varop'>++</span> <span class='hs-str'>" "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>a</span>
<a name="line-94"></a>
<a name="line-95"></a><a name="getShellCompl"></a><span class='hs-definition'>getShellCompl</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> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-96"></a><span class='hs-definition'>getShellCompl</span> <span class='hs-varid'>cmds</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>s</span> <span class='hs-varop'>==</span> <span class='hs-str'>""</span> <span class='hs-varop'>||</span> <span class='hs-varid'>last</span> <span class='hs-varid'>s</span> <span class='hs-varop'>==</span> <span class='hs-chr'>' '</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-97"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-98"></a> <span class='hs-varid'>f</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>lines</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runProcessWithInput</span> <span class='hs-str'>"bash"</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-str'>"compgen -A file -- "</span>
<a name="line-99"></a> <span class='hs-varop'>++</span> <span class='hs-varid'>s</span> <span class='hs-varop'>++</span> <span class='hs-str'>"\n"</span><span class='hs-layout'>)</span>
<a name="line-100"></a> <span class='hs-varid'>files</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>of</span>
<a name="line-101"></a> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>fs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getFileStatus</span> <span class='hs-layout'>(</span><span class='hs-varid'>encodeString</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-102"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>isDirectory</span> <span class='hs-varid'>fs</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span> <span class='hs-varop'>++</span> <span class='hs-str'>"/"</span><span class='hs-keyglyph'>]</span>
<a name="line-103"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-104"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>f</span>
<a name="line-105"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-varid'>uniqSort</span> <span class='hs-varop'>$</span> <span class='hs-varid'>files</span> <span class='hs-varop'>++</span> <span class='hs-varid'>commandCompletionFunction</span> <span class='hs-varid'>cmds</span> <span class='hs-varid'>s</span>
<a name="line-106"></a>
<a name="line-107"></a><a name="commandCompletionFunction"></a><span class='hs-definition'>commandCompletionFunction</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> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-108"></a><span class='hs-definition'>commandCompletionFunction</span> <span class='hs-varid'>cmds</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>|</span> <span class='hs-chr'>'/'</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-109"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varid'>isPrefixOf</span> <span class='hs-varid'>str</span><span class='hs-layout'>)</span> <span class='hs-varid'>cmds</span>
<a name="line-110"></a>
<a name="line-111"></a><a name="getCommands"></a><span class='hs-definition'>getCommands</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-112"></a><span class='hs-definition'>getCommands</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-113"></a> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getEnv</span> <span class='hs-str'>"PATH"</span> <span class='hs-varop'>`</span><span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>catch</span><span class='hs-varop'>`</span> <span class='hs-varid'>econst</span> <span class='hs-conid'>[]</span>
<a name="line-114"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span> <span class='hs-str'>""</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>split</span> <span class='hs-chr'>':'</span> <span class='hs-varid'>p</span>
<a name="line-115"></a> <span class='hs-varid'>es</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>forM</span> <span class='hs-varid'>ds</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-116"></a> <span class='hs-varid'>exists</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>doesDirectoryExist</span> <span class='hs-varid'>d</span>
<a name="line-117"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>exists</span>
<a name="line-118"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>getDirectoryContents</span> <span class='hs-varid'>d</span>
<a name="line-119"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-120"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-varid'>uniqSort</span> <span class='hs-varop'>.</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>/=</span> <span class='hs-chr'>'.'</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>head</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>$</span> <span class='hs-varid'>es</span>
<a name="line-121"></a>
<a name="line-122"></a><a name="split"></a><span class='hs-definition'>split</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span><span class='hs-keyglyph'>]</span>
<a name="line-123"></a><span class='hs-definition'>split</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-124"></a><span class='hs-definition'>split</span> <span class='hs-varid'>e</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span>
<a name="line-125"></a> <span class='hs-varid'>f</span> <span class='hs-conop'>:</span> <span class='hs-varid'>split</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-varid'>rest</span> <span class='hs-varid'>ls</span><span class='hs-layout'>)</span>
<a name="line-126"></a> <span class='hs-keyword'>where</span>
<a name="line-127"></a> <span class='hs-layout'>(</span><span class='hs-varid'>f</span><span class='hs-layout'>,</span><span class='hs-varid'>ls</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span><span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>l</span>
<a name="line-128"></a> <span class='hs-varid'>rest</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>s</span> <span class='hs-varop'>==</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-129"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tail</span> <span class='hs-varid'>s</span>
<a name="line-130"></a>
<a name="line-131"></a><a name="escape"></a><span class='hs-definition'>escape</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-132"></a><span class='hs-definition'>escape</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
<a name="line-133"></a><span class='hs-definition'>escape</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>
<a name="line-134"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSpecialChar</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'\\'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>escape</span> <span class='hs-varid'>xs</span>
<a name="line-135"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>escape</span> <span class='hs-varid'>xs</span>
<a name="line-136"></a>
<a name="line-137"></a><a name="isSpecialChar"></a><span class='hs-definition'>isSpecialChar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-138"></a><span class='hs-definition'>isSpecialChar</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flip</span> <span class='hs-varid'>elem</span> <span class='hs-str'>" &\\@\"'#?$*()[]{};"</span>
<a name="line-139"></a>
<a name="line-140"></a><a name="env"></a><span class='hs-comment'>-- | Ask the shell environment for the value of a variable in XMonad's environment, with a default value.</span>
<a name="line-141"></a><span class='hs-comment'>-- In order to /set/ an environment variable (eg. combine with a prompt so you can modify @$HTTP_PROXY@ dynamically),</span>
<a name="line-142"></a><span class='hs-comment'>-- you need to use 'System.Posix.putEnv'.</span>
<a name="line-143"></a><span class='hs-definition'>env</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-144"></a><span class='hs-definition'>env</span> <span class='hs-varid'>variable</span> <span class='hs-varid'>fallthrough</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getEnv</span> <span class='hs-varid'>variable</span> <span class='hs-varop'>`</span><span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>catch</span><span class='hs-varop'>`</span> <span class='hs-varid'>econst</span> <span class='hs-varid'>fallthrough</span>
<a name="line-145"></a>
<a name="line-146"></a><a name="getBrowser"></a><span class='hs-comment'>{- | Ask the shell what browser the user likes. If the user hasn't defined any
<a name="line-147"></a> $BROWSER, defaults to returning \"firefox\", since that seems to be the most
<a name="line-148"></a> common X web browser.
<a name="line-149"></a> Note that if you don't specify a GUI browser but a textual one, that'll be a problem
<a name="line-150"></a> as 'getBrowser' will be called by functions expecting to be able to just execute the string
<a name="line-151"></a> or pass it to a shell; so in that case, define $BROWSER as something like \"xterm -e elinks\"
<a name="line-152"></a> or as the name of a shell script doing much the same thing. -}</span>
<a name="line-153"></a><span class='hs-definition'>getBrowser</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-154"></a><span class='hs-definition'>getBrowser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>env</span> <span class='hs-str'>"BROWSER"</span> <span class='hs-str'>"firefox"</span>
<a name="line-155"></a>
<a name="line-156"></a><a name="getEditor"></a><span class='hs-comment'>-- | Like 'getBrowser', but should be of a text editor. This gets the $EDITOR variable, defaulting to \"emacs\".</span>
<a name="line-157"></a><span class='hs-definition'>getEditor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-158"></a><span class='hs-definition'>getEditor</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>env</span> <span class='hs-str'>"EDITOR"</span> <span class='hs-str'>"emacs"</span>
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