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<h1>LaTeX like macro for markdown</h1>
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<p><span class="sc"><abbr title="Too long; didn't read">tl;dr</abbr>: </span> I made a simple macro system for my blog. Now I juste have to write %<span></span>latex and it show as <span style="text-transform: uppercase">L<sup style="vertical-align: 0.15em; margin-left: -0.36em; margin-right: -0.15em; font-size: .85em">a</sup>T<sub style="vertical-align: -0.5ex; margin-left: -0.1667em; margin-right: -0.125em; font-size: 1em">e</sub>X</span>.</p>
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<p>I added a macro system for my blog system. When we are used to <span style="text-transform: uppercase">L<sup style="vertical-align: 0.15em; margin-left: -0.36em; margin-right: -0.15em; font-size: .85em">a</sup>T<sub style="vertical-align: -0.5ex; margin-left: -0.1667em; margin-right: -0.125em; font-size: 1em">e</sub>X</span> this lack can be hard to handle. Particularly when using mathematical notations. In the header of my files I simply write:</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode yaml"><code class="sourceCode yaml"></code></pre></div>
<p>In the body it will replace every occurrence of:</p>
<ul>
<li>%<span></span>test by <em>Just a test</em>,</li>
<li>and %<span></span>latex by <em><span style="text-transform: uppercase">L<sup style="vertical-align: 0.15em; margin-left: -0.36em; margin-right: -0.15em; font-size: .85em">a</sup>T<sub style="vertical-align: -0.5ex; margin-left: -0.1667em; margin-right: -0.125em; font-size: 1em">e</sub>X</span></em>.</li>
</ul>
<p>The source code is really simple. For <code>nanoc</code> user, simply put this file in your <code>lib</code> directory.</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode ruby"><code class="sourceCode ruby"><a class="sourceLine" id="cb2-1" title="1"><span class="co"># usage:</span></a>
<a class="sourceLine" id="cb2-2" title="2"><span class="co"># ---</span></a>
<a class="sourceLine" id="cb2-3" title="3"><span class="co"># ...</span></a>
<a class="sourceLine" id="cb2-4" title="4"><span class="co"># macros:</span></a>
<a class="sourceLine" id="cb2-5" title="5"><span class="co"># test: &quot;passed test&quot;</span></a>
<a class="sourceLine" id="cb2-6" title="6"><span class="co"># ---</span></a>
<a class="sourceLine" id="cb2-7" title="7"><span class="co"># ...</span></a>
<a class="sourceLine" id="cb2-8" title="8"><span class="co"># Here is a Just a test.</span></a>
<a class="sourceLine" id="cb2-9" title="9"><span class="co">#</span></a>
<a class="sourceLine" id="cb2-10" title="10"><span class="kw">class</span> <span class="dt">Macros</span> &lt; <span class="dt">Nanoc3</span>::<span class="dt">Filter</span></a>
<a class="sourceLine" id="cb2-11" title="11"> identifier <span class="st">:falacy</span></a>
<a class="sourceLine" id="cb2-12" title="12"> <span class="ot">attr_accessor</span> <span class="st">:macro</span></a>
<a class="sourceLine" id="cb2-13" title="13"> <span class="kw">def</span> initialize(arg)</a>
<a class="sourceLine" id="cb2-14" title="14"> <span class="dv">super</span></a>
<a class="sourceLine" id="cb2-15" title="15"> <span class="ot">@macro</span>={}</a>
<a class="sourceLine" id="cb2-16" title="16"> <span class="ot">@macro</span>[<span class="st">:tlal</span>] =<span class="ot"> %{</span><span class="st">&lt;span class=&quot;sc&quot;&gt;&lt;abbr title=&quot;Trop long à lire&quot;&gt;tlàl&lt;/abbr&gt; : &lt;/span&gt;</span><span class="ot">}</span></a>
<a class="sourceLine" id="cb2-17" title="17"> <span class="ot">@macro</span>[<span class="st">:tldr</span>] =<span class="ot"> %{</span><span class="st">&lt;span class=&quot;sc&quot;&gt;&lt;abbr title=&quot;Too long; didn't read&quot;&gt;tl;dr&lt;/abbr&gt;: &lt;/span&gt;</span><span class="ot">}</span></a>
<a class="sourceLine" id="cb2-18" title="18"> <span class="kw">if</span> <span class="ot">@item</span>.nil?</a>
<a class="sourceLine" id="cb2-19" title="19"> <span class="kw">if</span> <span class="kw">not</span> arg.nil?</a>
<a class="sourceLine" id="cb2-20" title="20"> <span class="ot">@macro</span>.merge!( arg )</a>
<a class="sourceLine" id="cb2-21" title="21"> <span class="kw">end</span></a>
<a class="sourceLine" id="cb2-22" title="22"> <span class="kw">else</span></a>
<a class="sourceLine" id="cb2-23" title="23"> <span class="kw">if</span> <span class="kw">not</span> <span class="ot">@item</span>[<span class="st">:macros</span>].nil?</a>
<a class="sourceLine" id="cb2-24" title="24"> <span class="ot">@macro</span>.merge!( <span class="ot">@item</span>[<span class="st">:macros</span>] )</a>
<a class="sourceLine" id="cb2-25" title="25"> <span class="kw">end</span></a>
<a class="sourceLine" id="cb2-26" title="26"> <span class="kw">end</span></a>
<a class="sourceLine" id="cb2-27" title="27"> <span class="kw">end</span></a>
<a class="sourceLine" id="cb2-28" title="28"> <span class="kw">def</span> macro_value_for(macro_name)</a>
<a class="sourceLine" id="cb2-29" title="29"> <span class="kw">if</span> macro_name.nil? <span class="kw">or</span> macro_name==<span class="st">&quot;&quot;</span> <span class="kw">or</span> <span class="ot">@macro</span>[macro_name.intern].nil?</a>
<a class="sourceLine" id="cb2-30" title="30"> <span class="kw">return</span><span class="ot"> %{</span><span class="st">%</span><span class="ot">#{</span>macro_name<span class="ot">}}</span> </a>
<a class="sourceLine" id="cb2-31" title="31"> <span class="kw">end</span></a>
<a class="sourceLine" id="cb2-32" title="32"> <span class="kw">return</span> <span class="ot">@macro</span>[macro_name.intern]</a>
<a class="sourceLine" id="cb2-33" title="33"> <span class="kw">end</span></a>
<a class="sourceLine" id="cb2-34" title="34"> <span class="kw">def</span> run(content, params={})</a>
<a class="sourceLine" id="cb2-35" title="35"> content.gsub(<span class="ot">/%(\w*)/</span>) <span class="kw">do</span> |m| </a>
<a class="sourceLine" id="cb2-36" title="36"> <span class="kw">if</span> m != <span class="ch">'%'</span></a>
<a class="sourceLine" id="cb2-37" title="37"> macro_value_for(<span class="dt">$1</span>)</a>
<a class="sourceLine" id="cb2-38" title="38"> <span class="kw">else</span></a>
<a class="sourceLine" id="cb2-39" title="39"> m</a>
<a class="sourceLine" id="cb2-40" title="40"> <span class="kw">end</span></a>
<a class="sourceLine" id="cb2-41" title="41"> <span class="kw">end</span></a>
<a class="sourceLine" id="cb2-42" title="42"> <span class="kw">end</span></a>
<a class="sourceLine" id="cb2-43" title="43"><span class="kw">end</span></a></code></pre></div>
<p>Macros could be very useful, read <a href="http://adam.gomaa.us/blog/2007/oct/22/markdown-doesnt-scale/index.html">this article</a> for example.</p>
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Published on 2010-10-26
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