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<a name="Automatic-Preferences-1"></a>
<h3 class="section">3.9 Automatic Preferences</h3>
<a name="index-Automatic-preferences-1"></a>

<p>Automatic preferences let you set up a custom configuration that is
automatically used whenever you open a file with a given extension. For
instance, you may prefer a <small>TAB</small> size of three when editing C sources, but
eight could be more palatable when writing electronic mail.
</p>
<p>The use of autoprefs is definitely straightforward. You simply use the
&lsquo;<samp>Save AutoPrefs</samp>&rsquo; menu item (or the <code>SaveAutoPrefs</code> command;
see <a href="SaveAutoPrefs.html#SaveAutoPrefs">SaveAutoPrefs</a>) when the current document has the given extension and
the current configuration suits your tastes. The internal state of a series of
options will be recorded as a macro containing commands that reproduce the
current configuration. The macro is then saved in the <samp>~/.ne</samp>
directory (which is created if necessary) with the name given by the
extension, postfixed with &lsquo;<samp>#ap</samp>&rsquo;. Thus, the C sources automatic
preferences file will be named &lsquo;<samp>c#ap</samp>&rsquo;, the one for TeX files &lsquo;<samp>tex#ap</samp>&rsquo;,
and so on.
</p>
<p>Macros are generated with short or long command names depending on the
status of the verbose macros flag. See <a href="VerboseMacros.html#VerboseMacros">VerboseMacros</a>.
</p>
<p>Automatic preferences files are loaded and executed whenever a file with a known
extension is opened. Note that you can manually edit such files, and even
insert commands, but any command that does something other than setting a flag
will be rejected, and an error message will be issued.
</p>





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