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It is better to have docs built in the repo so that building scm version doesn't fail with 'missing doc directory' error.
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<div class="section" id="mutually-exclusive-groups">
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<h1>Mutually exclusive groups<a class="headerlink" href="#mutually-exclusive-groups" title="Permalink to this headline">¶</a></h1>
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<p>A group of options can be marked as mutually exclusive using <tt class="docutils literal"><span class="pre">:mutex(option,</span> <span class="pre">...)</span></tt> method of the Parser class.</p>
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<div class="highlight-lua"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1
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4</pre></div></td><td class="code"><div class="highlight"><pre><span class="n">parser</span><span class="p">:</span><span class="n">mutex</span><span class="p">(</span>
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<span class="n">parser</span><span class="p">:</span><span class="n">flag</span> <span class="s2">"</span><span class="s">-q --quiet"</span><span class="p">,</span>
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<span class="n">parser</span><span class="p">:</span><span class="n">flag</span> <span class="s2">"</span><span class="s">-v --verbose"</span>
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<span class="p">)</span>
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</pre></div>
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</td></tr></table></div>
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<p>If more than one element of a mutually exclusive group is used, an error is raised.</p>
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<div class="highlight-python"><div class="highlight"><pre>$ lua script.lua -qv
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</pre></div>
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<div class="highlight-python"><div class="highlight"><pre>Usage: script.lua ([-q] | [-v]) [-h]
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Error: option '-v' can not be used together with option '-q'
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</pre></div>
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