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<link rel="alternate" lang="fr" xml:lang="fr" title="Des macros LaTeX pour markdown" type="text/html" hreflang="fr" href="/Scratch/fr/blog/2010-10-26-LaTeX-like-macro-and-markdown/" />
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<h1>
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LaTeX like macro for markdown
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<p><span class="sc"><abbr title="Too long; don't read">tl;dr</abbr>: </span> I made a simple macro system for my blog. Now I juste have to write %<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.
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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.
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Particularly when using mathematical notations.
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In the header of my files I simply write:</p>
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<pre class="twilight">
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<span class="MetaTagAll"><span class="MetaTagInline">macros</span><span class="MetaTagAll">:</span></span>
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<span class="MetaTagAll"><span class="MetaTagInline">test</span><span class="MetaTagAll">:</span> </span><span class="String"><span class="String">"</span>This is a macro test<span class="String">"</span></span>
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<span class="MetaTagAll"><span class="MetaTagInline">latex</span><span class="MetaTagAll">:</span> </span><span class="String"><span class="String">'</span><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><span class="String">'</span></span>
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</pre>
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<p>In the body it will replace every occurrence of:</p>
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<ul>
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<li>%<span />test by <em>This is a macro test</em>,</li>
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<li>and %<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>
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</ul>
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<p>The source code is really simple.
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For <code>nanoc</code> user, simply put this file in your <code>lib</code> directory.</p>
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<div class="code"><div class="file"><a href="/Scratch/en/blog/2010-10-26-LaTeX-like-macro-and-markdown/code/macros.rb"> ➥ macros.rb </a></div><div class="withfile">
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<pre class="twilight">
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<span class="Comment"><span class="Comment">#</span> usage:</span>
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<span class="Comment"><span class="Comment">#</span> ---</span>
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<span class="Comment"><span class="Comment">#</span> ...</span>
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<span class="Comment"><span class="Comment">#</span> macros:</span>
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<span class="Comment"><span class="Comment">#</span> test: "passed test"</span>
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<span class="Comment"><span class="Comment">#</span> ---</span>
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<span class="Comment"><span class="Comment">#</span> ...</span>
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<span class="Comment"><span class="Comment">#</span> Here is a This is a macro test.</span>
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<span class="Comment"><span class="Comment">#</span></span>
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<span class="Keyword">class</span> <span class="Entity">Macros<span class="EntityInheritedClass"> <span class="EntityInheritedClass"><</span> Nanoc3::Filter</span></span>
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identifier <span class="Constant"><span class="Constant">:</span>falacy</span>
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<span class="Keyword">attr_accessor</span> <span class="Constant"><span class="Constant">:</span>macro</span>
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<span class="Keyword">def</span> <span class="Entity">initialize</span>(<span class="Variable">arg</span>)
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<span class="Keyword">super</span>
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<span class="Variable"><span class="Variable">@</span>macro</span><span class="Keyword">=</span>{}
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<span class="Variable"><span class="Variable">@</span>macro</span>[<span class="Constant"><span class="Constant">:</span>tlal</span>] <span class="Keyword">=</span> <span class="String"><span class="String">%{</span><span class="sc"><abbr title="Trop long à lire">tlàl</abbr> : </span><span class="String">}</span></span>
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<span class="Variable"><span class="Variable">@</span>macro</span>[<span class="Constant"><span class="Constant">:</span>tldr</span>] <span class="Keyword">=</span> <span class="String"><span class="String">%{</span><span class="sc"><abbr title="Too long; don't read">tl;dr</abbr>: </span><span class="String">}</span></span>
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<span class="Keyword">if</span> <span class="Variable"><span class="Variable">@</span>item</span>.<span class="Entity">nil?</span>
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<span class="Keyword">if</span> <span class="Keyword">not</span> arg.<span class="Entity">nil?</span>
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<span class="Variable"><span class="Variable">@</span>macro</span>.<span class="Entity">merge!</span>( arg )
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<span class="Keyword">end</span>
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<span class="Keyword">else</span>
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<span class="Keyword">if</span> <span class="Keyword">not</span> <span class="Variable"><span class="Variable">@</span>item</span>[<span class="Constant"><span class="Constant">:</span>macros</span>].<span class="Entity">nil?</span>
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<span class="Variable"><span class="Variable">@</span>macro</span>.<span class="Entity">merge!</span>( <span class="Variable"><span class="Variable">@</span>item</span>[<span class="Constant"><span class="Constant">:</span>macros</span>] )
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<span class="Keyword">end</span>
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<span class="Keyword">end</span>
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<span class="Keyword">end</span>
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<span class="Keyword">def</span> <span class="Entity">macro_value_for</span>(<span class="Variable">macro_name</span>)
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<span class="Keyword">if</span> macro_name.<span class="Entity">nil?</span> <span class="Keyword">or</span> macro_name<span class="Keyword">==</span><span class="String"><span class="String">"</span><span class="String">"</span></span> <span class="Keyword">or</span> <span class="Variable"><span class="Variable">@</span>macro</span>[macro_name.<span class="Entity">intern</span>].<span class="Entity">nil?</span>
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<span class="Keyword">return</span> <span class="String"><span class="String">%{</span>%<span class="StringEmbeddedSource"><span class="StringEmbeddedSource">#{</span>macro_name<span class="StringEmbeddedSource">}</span></span><span class="String">}</span></span>
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<span class="Keyword">end</span>
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<span class="Keyword">return</span> <span class="Variable"><span class="Variable">@</span>macro</span>[macro_name.<span class="Entity">intern</span>]
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<span class="Keyword">end</span>
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<span class="Keyword">def</span> <span class="Entity">run</span>(<span class="Variable">content<span class="Variable">,</span> params<span class="Keyword">=</span><span class="Variable">{</span><span class="Variable">}</span></span>)
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content.<span class="Entity">gsub</span>(<span class="StringRegexp"><span class="StringRegexp">/</span></span><span class="StringRegexp">%<span class="StringRegexp"><span class="StringRegexp">(</span><span class="StringRegexpSpecial">\w</span>*<span class="StringRegexp">)</span></span></span><span class="StringRegexp"><span class="StringRegexp">/</span></span>) <span class="Keyword">do </span>|<span class="Variable">m</span>|
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<span class="Keyword">if</span> m <span class="Keyword">!=</span> <span class="String"><span class="String">'</span>%<span class="String">'</span></span>
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<span class="Entity">macro_value_for</span>(<span class="Variable"><span class="Variable">$</span>1</span>)
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<span class="Keyword">else</span>
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m
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<span class="Keyword">end</span>
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<span class="Keyword">end</span>
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<span class="Keyword">end</span>
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<span class="Keyword">end</span>
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</pre>
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</div></div>
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<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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<div id="lastmod">
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Created: 10/26/2010
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Modified: 04/07/2011
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Entirely done with
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<a href="http://www.vim.org">Vim</a>
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and
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