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<h5 class="subsubsection">16.6.4.4 Querying switches interactively</h5>

<p><a name="index-input_005fdialog-881"></a><a name="index-yes_005fno_005fdialog-882"></a><!--  -->

   <p>Another solution to query the arguments for the tool is to ask the user
interactively. 
The scripting languages provides a number of solutions for these.

   <p>They generally have their own native way to read input, possibly by creating
a dialog.

   <p>In addition, the simplest solution is to use the predefined GPS commands for
this. These are the two functions:

     <dl>
<dt><code>yes_no_dialog</code><dd>This function takes a single argument, which is a question to display. Two
buttons are then available to the user, "Yes" and "No". The result of this
function is the button the user has selected, as a boolean value.

     <br><dt><code>input_dialog</code><dd>This function is more general. It takes a minimum of two arguments, with no
upper limit. The first argument is a message describing what input is expected
from the user. The second, third and following arguments each correspond to
an entry line in the dialog, to query one specific value (as a string). The
result of this function is a list of strings, each corresponding to these
arguments.

     <p>From the GPS shell, it is only convenient to query one value at a time, since
it doesn't have support for lists, and would return a concatenation of the
values. However, this function is especially useful with other scripting
languages. 
</dl>

   <p>The following is a short example that queries the name of a directory and a
file name, and displays each in the Messages window.

<pre class="smallexample">     &lt;?xml version="1.0" ?&gt;
     &lt;query_file&gt;
       &lt;action name="query file and dir"&gt;
         &lt;shell lang="python"&gt;list=GPS.MDI.input_dialog \
           ("Please enter directory and file name", "Directory", "File")&lt;/shell&gt;
         &lt;shell lang="python"&gt;print ("Dir=" + list[0], "File=" + list[1])&lt;/shell&gt;
         &lt;/shell&gt;
       &lt;/action&gt;
     &lt;/query_file&gt;
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gnat-gps-doc 5.0-6 / usr / share / doc / gnat-gps / html / Querying-switches-interactively.html
