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<h2 id="sec:mtoplevel"><a id="sec:5.6"><span class="sec-nr">5.6</span> <span class="sec-title">Interacting 
with modules from the top level</span></a></h2>

<a id="sec:mtoplevel"></a>

<p>Debugging often requires interaction with predicates that reside in 
modules: running them, setting spy points on them, etc. This can be 
achieved using the &lt;<var>module</var>&gt;:&lt;<var>term</var>&gt; 
construct explicitly as described above. In SWI-Prolog, you may also 
wish to omit the module qualification. Setting a spy point (<a id="idx:spy1:1439"></a><a class="pred" href="debugger.html#spy/1">spy/1</a>) 
on a plain predicate sets a spy point on any predicate with that name in 
any module. Editing (<a id="idx:edit1:1440"></a><a class="pred" href="edit.html#edit/1">edit/1</a>) 
or calling an unqualified predicate invokes the DWIM (Do What I Mean) 
mechanism, which generally suggests the correct qualified query.

<p>Mainly for compatibility, we provide <a id="idx:module1:1441"></a><a class="pred" href="mtoplevel.html#module/1">module/1</a> 
to switch the module with which the interactive top level interacts:

<dl class="latex">
<dt class="pubdef"><a id="module/1"><strong>module</strong>(<var>+Module</var>)</a></dt>
<dd class="defbody">
The call <code>module(<var>Module</var>)</code> may be used to switch 
the default working module for the interactive top level (see <a id="idx:prolog0:1442"></a><a class="pred" href="toplevel.html#prolog/0">prolog/0</a>). 
This may be used when debugging a module. The example below lists the 
clauses of <a id="idx:fileoflabel2:1443"></a><span class="pred-ext">file_of_label/2</span> 
in the module <code>tex</code>.

<pre class="code">
1 ?- module(tex).
true.
tex: 2 ?- listing(file_of_label/2).
...
</pre>

<p></dd>
</dl>

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swi-prolog-nox 6.6.4-2ubuntu1 / usr / lib / swi-prolog / doc / Manual / mtoplevel.html
