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<h1 id="create-an-alias-for-a-target">Create an Alias for a Target</h1>
<h2 id="problem">Problem</h2>
<p>You have a library target definition buried deep within the directory structure
of your project and want to make it easier for others to refer to that
definition (for example when specifying dependencies).</p>
<h2 id="solution">Solution</h2>
<p>Specify a <code>target</code> definition that refers to a target deeper in the directory
tree and acts as a proxy for it.</p>
<h2 id="discussion">Discussion</h2>
<p>Let's say that you have a project with a <code>BUILD</code> file specifying a Scala
<code>scala_library</code> target that's deep in the directory tree, for example at
<code>myproject/subproject/src/main/scala</code>. In order for other libraries to depend
on that project, you'd need to add something like this to their dependencies:</p>
<div class="codehilite"><pre><span class="n">dependencies</span><span class="o">=</span><span class="p">[</span>
<span class="c"># ...</span>
<span class="s">'myproject/src/main/scala/com/twitter/myproject:scala'</span><span class="p">,</span>
<span class="c"># ...</span>
<span class="p">]</span>
</pre></div>
<p>In addition, Pants commands would be similarly verbose:</p>
<div class="codehilite"><pre><span class="nv">$ </span>./pants compile myproject/src/main/scala/com/twitter/myproject:scala
</pre></div>
<p>You can simplify this by creating a <code>target</code> definition in a <code>BUILD</code> file
stored in a more convenient location in the directory tree, for example in the root directory. Here's an example:</p>
<div class="codehilite"><pre><span class="p">::</span> <span class="n">python</span>
<span class="c"># myproject/BUILD</span>
<span class="n">target</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'myproject'</span><span class="p">,</span>
<span class="n">dependencies</span><span class="o">=</span><span class="p">[</span>
<span class="s">'myproject/src/main/scala/com/twitter/myproject/subproject/util:scala'</span>
<span class="p">]</span>
<span class="p">)</span>
</pre></div>
<p>Now, other projects can depend on the library target in a more concise manner:</p>
<div class="codehilite"><pre><span class="p">::</span> <span class="n">python</span>
<span class="n">dependencies</span><span class="o">=</span><span class="p">[</span>
<span class="c"># ...</span>
<span class="s">'myproject:myproject'</span><span class="p">,</span>
<span class="c"># ...</span>
<span class="p">]</span>
</pre></div>
<p>Pants commands involving the target are simplified as well. Here's a comparison:</p>
<div class="codehilite"><pre>:: bash
<span class="c"># Without target alias</span>
<span class="nv">$ </span>./pants compile myproject/src/main/scala/com/twitter/myproject/subproject/util:scala
<span class="c"># With target alias</span>
<span class="nv">$ </span>./pants compile myproject:myproject
</pre></div>
<p>NOTE: Proper aliases always contain exactly one destination. Using them to combine multiple library targets introduces false dependencies between the dependent and the dependency. </p>
<h2 id="see-also">See Also</h2>
<ul>
<li><a href="dependencies.html">Add a Dependency on Another Target</a></li>
</ul>
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