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Code Editor : jed021.html

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<title>Miscellaneous</title>
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<h2 id="sec45" class="section">20&#X2003;Miscellaneous</h2>
<h3 id="sec46" class="subsection">20.1&#X2003;Abort Character</h3>

The abort character (Ctrl-G by default) is special and should not be
rebound. On the IBMPC, the keyboard interrupt 0x09 is hooked and a quit
condition is signaled when it is pressed. For this reason, it should not
be used in any keybindings. A similar statement holds for the other
systems.This character may be changed using the function <code class="verb">set_abort_char</code>
Using this function affects all keymaps. For example, putting the line
<pre class="verbatim"> set_abort_char (30);
</pre>
in your <code class="verb">jed.rc</code> file will change the abort character from its
current value to 30 which is Ctrl-<code class="verb">^</code>.
<h3 id="sec47" class="subsection">20.2&#X2003;Input Translation</h3>
By using the function <code class="verb">map_input</code> the user is able to remap
characters input from the terminal before jed&#X2019;s keymap routines have a
chance to act upon them. This is useful when it is difficult to get jed
to see certain characters. For example, consider the Ctrl-S
character. This character is especially notorious because many systems
use it and Ctrl-Q for flow control. Nevertheless Emacs uses
Ctrl-S for searching. Short of rebinding all keys which involve a
Ctrl-S how does one work with functions that are bound to key
sequences using Ctrl-S? This is where <code class="verb">map_input</code> comes into
play. The <code class="verb">map_input</code> function requires two integer arguments which
define how a given ascii character is to be mapped. Suppose that you wish
to substitute Ctrl-<code class="verb">\</code> for Ctrl-S everywhere. The line
<pre class="verbatim"> map_input (28, 19);
</pre>
will do the trick. Here 28 is the ascii character of Ctrl-<code class="verb">\</code>
and 19 is the ascii character for the Ctrl-S.As another example, consider the case where the backspace key sends out a
Ctrl-H instead of the DEL character (Ctrl-?).
<pre class="verbatim"> map_input (8, 127);
</pre>
will map the Ctrl-H (ascii 8) to the delete character (ascii 127).
<h3 id="sec48" class="subsection">20.3&#X2003;Display Sizes</h3>
On VMS and unix systems, the screen size may be changed to either 80 or
132 columns by using the functions <code class="verb">w80</code> and <code class="verb">w132</code>
respectively. Simply enter the appropriate function name at the <code class="verb">M-x</code>
prompt in the minibuffer. The default binding for access to the
minibuffer is Esc X. Most window systems, e.g., DECWindows, allow
the window size to be changed. When this is done, jed should
automatically adapt to the new size.On the PC, at this time the screen size cannot be changed while jed is
running. Instead it is necessary to exit jed first then set the display
size and rerun jed.<hr>
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