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<title>src/Lambdabot/Plugin/Core/More.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- | Support for more(1) buffering</span>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Lambdabot</span><span class='hs-varop'>.</span><span class='hs-conid'>Plugin</span><span class='hs-varop'>.</span><span class='hs-conid'>Core</span><span class='hs-varop'>.</span><span class='hs-conid'>More</span> <span class='hs-layout'>(</span><span class='hs-varid'>morePlugin</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'>Lambdabot</span><span class='hs-varop'>.</span><span class='hs-conid'>Bot</span>
<a name="line-5"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Lambdabot</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-6"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Lambdabot</span><span class='hs-varop'>.</span><span class='hs-conid'>Plugin</span>
<a name="line-7"></a>
<a name="line-8"></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-9"></a>
<a name="line-10"></a><a name="MoreState"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>MoreState</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GlobalPrivate</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-11"></a><a name="More"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>More</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ModuleT</span> <span class='hs-conid'>MoreState</span> <span class='hs-conid'>LB</span>
<a name="line-12"></a>
<a name="line-13"></a><a name="morePlugin"></a><span class='hs-comment'>-- the @more state is handled centrally</span>
<a name="line-14"></a><span class='hs-definition'>morePlugin</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Module</span> <span class='hs-layout'>(</span><span class='hs-conid'>GlobalPrivate</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-15"></a><span class='hs-definition'>morePlugin</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>newModule</span>
<a name="line-16"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>moduleDefState</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mkGlobalPrivate</span> <span class='hs-num'>20</span> <span class='hs-conid'>()</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>moduleInit</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>registerOutputFilter</span> <span class='hs-varid'>moreFilter</span>
<a name="line-18"></a> <span class='hs-comment'>-- TODO: improve output filter system...</span>
<a name="line-19"></a> <span class='hs-comment'>-- currently, @more output will bypass any filters in the</span>
<a name="line-20"></a> <span class='hs-comment'>-- chain after 'moreFilter'</span>
<a name="line-21"></a>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>moduleCmds</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span>
<a name="line-23"></a> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-varid'>command</span> <span class='hs-str'>"more"</span><span class='hs-layout'>)</span>
<a name="line-24"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>help</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>say</span> <span class='hs-str'>"@more. Return more output from the bot buffer."</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>process</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-26"></a> <span class='hs-varid'>target</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getTarget</span>
<a name="line-27"></a> <span class='hs-varid'>morestate</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readPS</span> <span class='hs-varid'>target</span>
<a name="line-28"></a> <span class='hs-comment'>-- TODO: test theory that we can just "say" morestate;</span>
<a name="line-29"></a> <span class='hs-comment'>-- it should end up going through the moreFilter as needed</span>
<a name="line-30"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>morestate</span> <span class='hs-keyword'>of</span>
<a name="line-31"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-32"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>ls</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>moreFilter</span> <span class='hs-varid'>target</span> <span class='hs-varid'>ls</span><span class='hs-layout'>)</span>
<a name="line-33"></a> <span class='hs-varop'>>>=</span> <span class='hs-varid'>mapM_</span> <span class='hs-layout'>(</span><span class='hs-varid'>lb</span> <span class='hs-varop'>.</span> <span class='hs-varid'>ircPrivmsg'</span> <span class='hs-varid'>target</span><span class='hs-layout'>)</span>
<a name="line-34"></a> <span class='hs-layout'>}</span>
<a name="line-35"></a> <span class='hs-keyglyph'>]</span>
<a name="line-36"></a> <span class='hs-layout'>}</span>
<a name="line-37"></a>
<a name="line-38"></a><a name="moreFilter"></a><span class='hs-definition'>moreFilter</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Nick</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'>More</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-39"></a><span class='hs-definition'>moreFilter</span> <span class='hs-varid'>target</span> <span class='hs-varid'>msglines</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-40"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>morelines</span><span class='hs-layout'>,</span> <span class='hs-varid'>thislines</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>drop</span> <span class='hs-layout'>(</span><span class='hs-varid'>maxLines</span><span class='hs-varop'>+</span><span class='hs-num'>2</span><span class='hs-layout'>)</span> <span class='hs-varid'>msglines</span> <span class='hs-keyword'>of</span>
<a name="line-41"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-varid'>msglines</span><span class='hs-layout'>)</span>
<a name="line-42"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>drop</span> <span class='hs-varid'>maxLines</span> <span class='hs-varid'>msglines</span><span class='hs-layout'>,</span> <span class='hs-varid'>take</span> <span class='hs-varid'>maxLines</span> <span class='hs-varid'>msglines</span><span class='hs-layout'>)</span>
<a name="line-43"></a> <span class='hs-varid'>writePS</span> <span class='hs-varid'>target</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>morelines</span> <span class='hs-keyword'>then</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyword'>else</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>morelines</span>
<a name="line-44"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>thislines</span> <span class='hs-varop'>++</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>morelines</span>
<a name="line-45"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>[]</span>
<a name="line-46"></a> <span class='hs-keyword'>else</span> <span class='hs-keyglyph'>[</span><span class='hs-chr'>'['</span><span class='hs-conop'>:</span><span class='hs-varid'>shows</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>morelines</span><span class='hs-layout'>)</span> <span class='hs-str'>" @more lines]"</span><span class='hs-keyglyph'>]</span>
<a name="line-47"></a>
<a name="line-48"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>maxLines</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>5</span> <span class='hs-comment'>-- arbitrary, really</span>
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