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<title>Using the GNAT Programming Studio: Querying project switches</title>

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<a name="Querying-project-switches"></a>
<div class="header">
<p>
Next: <a href="Querying-switches-interactively.html#Querying-switches-interactively" accesskey="n" rel="next">Querying switches interactively</a>, Previous: <a href="Saving-open-windows.html#Saving-open-windows" accesskey="p" rel="previous">Saving open windows</a>, Up: <a href="Executing-external-tools.html#Executing-external-tools" accesskey="u" rel="up">Executing external tools</a> &nbsp; [<a href="Index-table.html#Index-table" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Querying-project-switches-1"></a>
<h4 class="subsubsection">16.6.4.3 Querying project switches</h4>
<a name="index-get_005ftool_005fswitches_005fas_005fstring"></a>
<a name="index-get_005ftool_005fswitches_005fas_005flist"></a>
<a name="index-get_005fattribute_005fas_005fstring"></a>
<a name="index-get_005fattribute_005fas_005flist"></a>

<p>Some GPS shell commands can be used to query the default switches set by the
user in the project file. These are <code>get_tool_switches_as_string</code>,
<code>get_tool_switches_as_list</code>, or, more generally,
<code>get_attribute_as_string</code> and <code>get_attribute_as_list</code>. The first
two require a unique parameter which is the name of the tool as specified in
the <code>&lt;tool&gt;</code> tag. This name is case-sensitive. The last two commands are
more general and can be used to query the status of any attribute from the
project. See their description by typing the following in the GPS shell
console window:
</p>
<div class="smallexample">
<pre class="smallexample">help Project.get_attribute_as_string
help Project.get_attribute_as_list
</pre></div>

<p>The following is a short example on how to query the switches for the tool
&quot;Find&quot; from the project, See <a href="Tool-example.html#Tool-example">Tool example</a>. It first creates an object
representing the current project, then passes this object as the first
argument of the <code>get_tool_switches_as_string</code> command. The last external
command is a simple output of these switches
</p>
<div class="smallexample">
<pre class="smallexample">&lt;?xml version=&quot;1.0&quot; ?&gt;
&lt;find_switches&gt;
  &lt;action name=&quot;Get switches for Find&quot;&gt;
    &lt;shell&gt;Project %p&lt;/shell&gt;
    &lt;shell&gt;Project.get_tool_switches_as_string %1 Find &lt;/shell&gt;
    &lt;external&gt;echo %1&lt;/external&gt;
  &lt;/action&gt;
&lt;/find_switches&gt;
</pre></div>

<p>The following example shows how something similar can be done from Python, in
a simpler manner. For a change, this function queries the Ada compiler
switches for the current project, and prints them out in the messages
window. The
</p>
<div class="smallexample">
<pre class="smallexample">&lt;?xml version=&quot;1.0&quot; ?&gt;
&lt;query_switches&gt;
  &lt;action name=&quot;Query compiler switches&quot;&gt;
    &lt;shell lang=&quot;python&quot;&gt;GPS.Project(&quot;%p&quot;).get_attribute_as_list
      (package=&quot;compiler&quot;,
       attribute=&quot;default_switches&quot;,
       index=&quot;ada&quot;)&lt;/shell&gt;
    &lt;external&gt;echo compiler switches= %1&lt;/external&gt;
  &lt;/action&gt;
&lt;/query_switches&gt;
</pre></div>




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