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<H2><A NAME="sec:2.5"><SPAN class="sec-nr">2.5</SPAN> <SPAN class="sec-title">GNU 
Emacs Interface</SPAN></A></H2>

<A NAME="sec:gemacs"></A>

<P><A NAME="idx:GNUEmacs:77"></A><A NAME="idx:Emacs:78"></A>The default 
Prolog mode for GNU-Emacs can be activated by adding the following rules 
to your Emacs initialisation file:

<PRE class="code">
(setq auto-mode-alist
      (append
       '(("\\.pl" . prolog-mode))
       auto-mode-alist))
(setq prolog-program-name "pl")
(setq prolog-consult-string "[user].\n")
;If you want this.  Indentation is either poor or I don't use
;it as intended.
;(setq prolog-indent-width 8)
</PRE>

<P>Unfortunately the default Prolog mode of GNU-Emacs is not very good. 
An alternative <CODE>prolog.el</CODE> file for GNU-Emacs 20 is available 
from
<A class="url" href="http://www.freesoft.cz/~pdm/software/emacs/prolog-mode/">http://www.freesoft.cz/~pdm/software/emacs/prolog-mode/</A> 
and for GNU-Emacs 19 from
<A class="url" href="http://w1.858.telia.com/~u85810764/Prolog-mode/index.html">http://w1.858.telia.com/~u85810764/Prolog-mode/index.html</A>

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swi-prolog-doc 5.6.59-2 / usr / share / doc / swi-prolog-doc / Manual / gemacs.html
