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<section class="tex2jax_ignore mathjax_ignore" id="unix-like-command-style">
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<h1>Unix-like Command style<a class="headerlink" href="#unix-like-command-style" title="Permalink to this headline">¶</a></h1>
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<p>Contribution by Vincent Le Geoff (vlgeoff), 2017</p>
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<p>This module contains a command class with an alternate syntax parser implementing
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Unix-style command syntax in-game. This means <code class="docutils literal notranslate"><span class="pre">--options</span></code>, positional arguments
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and stuff like <code class="docutils literal notranslate"><span class="pre">-n</span> <span class="pre">10</span></code>. It might not the best syntax for the average player
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but can be really useful for builders when they need to have a single command do
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many things with many options. It uses the <code class="docutils literal notranslate"><span class="pre">ArgumentParser</span></code> from Python’s standard
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library under the hood.</p>
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<section id="installation">
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<h2>Installation<a class="headerlink" href="#installation" title="Permalink to this headline">¶</a></h2>
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<p>To use, inherit <code class="docutils literal notranslate"><span class="pre">UnixCommand</span></code> from this module from your own commands. You need
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to override two methods:</p>
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<ul class="simple">
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<li><p>The <code class="docutils literal notranslate"><span class="pre">init_parser</span></code> method, which adds options to the parser. Note that you
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should normally <em>not</em> override the normal <code class="docutils literal notranslate"><span class="pre">parse</span></code> method when inheriting from
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<code class="docutils literal notranslate"><span class="pre">UnixCommand</span></code>.</p></li>
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<li><p>The <code class="docutils literal notranslate"><span class="pre">func</span></code> method, called to execute the command once parsed (like any Command).</p></li>
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</ul>
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<p>Here’s a short example:</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">evennia.contrib.base_systems.unixcommand</span> <span class="kn">import</span> <span class="n">UnixCommand</span>
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<span class="k">class</span> <span class="nc">CmdPlant</span><span class="p">(</span><span class="n">UnixCommand</span><span class="p">):</span>
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<span class="w"> </span><span class="sd">'''</span>
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<span class="sd"> Plant a tree or plant.</span>
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<span class="sd"> This command is used to plant something in the room you are in.</span>
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<span class="sd"> Examples:</span>
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<span class="sd"> plant orange -a 8</span>
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<span class="sd"> plant strawberry --hidden</span>
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<span class="sd"> plant potato --hidden --age 5</span>
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<span class="sd"> '''</span>
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<span class="n">key</span> <span class="o">=</span> <span class="s2">"plant"</span>
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<span class="k">def</span> <span class="nf">init_parser</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="s2">"Add the arguments to the parser."</span>
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<span class="c1"># 'self.parser' inherits `argparse.ArgumentParser`</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s2">"key"</span><span class="p">,</span>
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<span class="n">help</span><span class="o">=</span><span class="s2">"the key of the plant to be planted here"</span><span class="p">)</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s2">"-a"</span><span class="p">,</span> <span class="s2">"--age"</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span>
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<span class="n">default</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s2">"the age of the plant to be planted"</span><span class="p">)</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s2">"--hidden"</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s2">"store_true"</span><span class="p">,</span>
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<span class="n">help</span><span class="o">=</span><span class="s2">"should the newly-planted plant be hidden to players?"</span><span class="p">)</span>
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<span class="k">def</span> <span class="nf">func</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="s2">"func is called only if the parser succeeded."</span>
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<span class="c1"># 'self.opts' contains the parsed options</span>
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<span class="n">key</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">opts</span><span class="o">.</span><span class="n">key</span>
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<span class="n">age</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">opts</span><span class="o">.</span><span class="n">age</span>
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<span class="n">hidden</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">opts</span><span class="o">.</span><span class="n">hidden</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">msg</span><span class="p">(</span><span class="s2">"Going to plant '</span><span class="si">{}</span><span class="s2">', age=</span><span class="si">{}</span><span class="s2">, hidden=</span><span class="si">{}</span><span class="s2">."</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
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<span class="n">key</span><span class="p">,</span> <span class="n">age</span><span class="p">,</span> <span class="n">hidden</span><span class="p">))</span>
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</pre></div>
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</div>
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<p>To see the full power of argparse and the types of supported options, visit
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<a class="reference external" href="https://docs.python.org/2/library/argparse.html">the documentation of argparse</a>.</p>
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<hr class="docutils" />
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<p><small>This document page is generated from <code class="docutils literal notranslate"><span class="pre">evennia/contrib/base_systems/unixcommand/README.md</span></code>. Changes to this
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file will be overwritten, so edit that file rather than this one.</small></p>
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</section>
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</section>
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