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Code Editor : jed006.html

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<title>Emulating Other Editors</title>
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<h2 id="sec6" class="section">5&#X2003;Emulating Other Editors</h2>
jed&#X2019;s ability to create new functions using the S&#X2013;Lang programming
language as well as allowing the user to choose key bindings, makes the
emulation of other editors possible. Currently, jed provides reasonable
emulation of the Emacs, EDT, and Wordstar editors.
<h3 id="sec7" class="subsection">5.1&#X2003;Emacs Emulation</h3>
Emacs Emulation is provided by the S-Lang code in <code class="verb">emacs.sl</code>. The
basic functionality of Emacs is emulated; most Emacs users should have no
problem with jed. To enable Emacs emulation in jed, make sure that the
line
<pre class="verbatim"> evalfile ("emacs"); pop ():
</pre>
is in your <code class="verb">jed.rc</code> (<code class="verb">.jedrc</code>) startup file. jed is distributed
with this line already present in the default <code class="verb">jed.rc</code> file.
<h3 id="sec8" class="subsection">5.2&#X2003;EDT Emulation</h3>
For EDT emulation, <code class="verb">edt.sl</code> must be loaded. This is accomplished by
ensuring that the line<pre class="verbatim"> evalfile ("edt"); pop ();
</pre>is in present in the <code class="verb">jed.rc</code> (<code class="verb">.jedrc</code>) Startup File. jed is
distributed with EDT emulation enabled on VMS and Unix systems but the
above line is commented out in the <code class="verb">jed.rc</code> file on MS-DOS systems.This emulation provides a near identical emulation of the EDT keypad key
commands. In addition, the smaller keypad on the newer DEC terminals is
also setup. It is possible to have both EDT and Emacs emulation at the
same time. The only restriction is that <code class="verb">emacs.sl</code> must be loaded
before <code class="verb">edt.sl</code> is loaded.One minor difference between jed&#X2019;s EDT emulation and the real EDT concerns
the Ctrl-H key. EDT normally binds this to move the cursor to the
beginning of the line. However, jed uses it as a help key. Nevertheless,
it is possible to re-bind it. See the section on re-binding keys as well as
the file <code class="verb">edt.sl</code> for hints. Alternatively, simply put
<pre class="verbatim"> unsetkey ("^H"); setkey ("bol", "^H");
</pre>
in the <code class="verb">jed.rc</code> startup file after <code class="verb">edt.sl</code> is loaded. Keep in
mind that the Ctrl-H key will no longer function as a help key if
this is done.EDT emulation for PCs only work with the enhanced keyboard. When
<code class="verb">edt.sl</code> is loaded, a variable <code class="verb">NUMLOCK_IS_GOLD</code> is set which
instructs jed to interpret the Num-Lock key on the square numeric keypad to
function as the EDT GOLD key. In fact, this keypad should behave exactly
like the keypad on VTxxx terminals. The only other problem that remains
concerns the + key on the PC keypad. This key occupies two VTxxx
key positions, the minus and the comma (delete word and character) keys.
Thus a decision had to be made about which key to emulate. I chose the
+ key to return the characters Esc O l which jed maps
to the delete character function. This may be changed to the delete word
function if you prefer. See the file <code class="verb">edt.sl</code> for details.The GOLD&#X2013;GOLD key combination toggles the keypad between
application and numeric states. On the PC, this is not possible. Instead,
the PC F1 key has been instructed to perform this task.
<h3 id="sec9" class="subsection">5.3&#X2003;Wordstar Emulation</h3>
<code class="verb">wordstar.sl</code> contains the S-Lang code for jed&#X2019;s Wordstar
emulation. Adding the line
<pre class="verbatim"> evalfile ("wordstar"); pop ();
</pre>
to your <code class="verb">jed.rc</code> (<code class="verb">.jedrc</code>) startup file will enable jed&#X2019;s
Wordstar emulation.
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Code Editor : jed006.html