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<h1 class="title"><a id="ch4"/>Chapter 4. Modules and interfaces</h1>
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<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">The user interface module</span>
</dt>
<dd>
<p>
Look at Behan Webster's documentation.
</p>
</dd>
<dt>
<span class="term">Widget set</span>
</dt>
<dd>
<p>
Related closely to above Could some one present design decisions of the widget
set here?
</p>
</dd>
<dt>
<span class="term">pdate Module</span>
</dt>
<dd>
<p>
Distinct versions of the same package are recorded separately, but if multiple
Packages files contain the same version of a package, then only the first one
is recorded. For this reason, the least expensive update source should be
listed first (local file system is better than a remote ftp site)
</p>
<p>
This module should interact with the user interface module to set and change
configuration parameters for the modules listed below. It needs to record that
information in an on disk data file, to be read on future invocations.
</p>
<div class="orderedlist">
<ol class="orderedlist">
<li class="listitem">
<p>
FTP methods
</p>
</li>
<li class="listitem">
<p>
mount and file traversal module(s)?
</p>
</li>
<li class="listitem">
<p>
Other methods ???
</p>
</li>
</ol>
</div>
</dd>
<dt>
<span class="term">Status file parser/generator</span>
</dt>
<dd>
<p>
The status file records the current state of the system, listing the packages
installed, etc. The status file is also one method of communicating with dpkg,
since it is perfectly permissible for the user to use APT to request packages
be updated, put others on hold, mark other for removal, etc, and then run
<code class="literal">dpkg -BORGiE</code> on a file system.
</p>
</dd>
<dt>
<span class="term">Package file parser/generator</span>
</dt>
<dd>
<p>
Related to above. Handle multiple Packages files, from different
sources. Each package contains a link back to the packages file structure
that contains details about the origin of the data.
</p>
</dd>
<dt>
<span class="term">Dependency module</span>
</dt>
<dd>
<div class="itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<p>
dependency/conflict determination and linking
</p>
</li>
<li class="listitem">
<p>
reverse dependency generator. Maybe merged with above
</p>
</li>
</ul>
</div>
</dd>
<dt>
<span class="term">Package ordering Module</span>
</dt>
<dd>
<p>
Create an ordering of the actions to be taken.
</p>
</dd>
<dt>
<span class="term">Event generator</span>
</dt>
<dd>
<p>
module to interact with dpkg
</p>
</dd>
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