/usr/lib/swi-prolog/doc/Manual/tty.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html>
<head>
<title>SWI-Prolog 7.1.10 Reference Manual: Section 4.33</title><link rel="home" href="index.html">
<link rel="contents" href="Contents.html">
<link rel="index" href="DocIndex.html">
<link rel="summary" href="summary.html">
<link rel="previous" href="format.html">
<link rel="next" href="system.html">

<style type="text/css">

/* Style sheet for SWI-Prolog latex2html
*/

dd.defbody
{ margin-bottom: 1em;
}

dt.pubdef, dt.multidef
{ color: #fff;
padding: 2px 10px 0px 10px;
margin-bottom: 5px;
font-size: 18px;
vertical-align: middle;
overflow: hidden;
}

dt.pubdef { background-color: #0c3d6e; }
dt.multidef { background-color: #ef9439; }

.bib dd
{ margin-bottom: 1em;
}

.bib dt
{ float: left;
margin-right: 1.3ex;
}

pre.code
{ margin-left: 1.5em;
margin-right: 1.5em;
border: 1px dotted;
padding-top: 5px;
padding-left: 5px;
padding-bottom: 5px;
background-color: #f8f8f8;
}

div.navigate
{ text-align: center;
background-color: #f0f0f0;
border: 1px dotted;
padding: 5px;
}

div.title
{ text-align: center;
padding-bottom: 1em;
font-size: 200%;
font-weight: bold;
}

div.author
{ text-align: center;
font-style: italic;
}

div.abstract
{ margin-top: 2em;
background-color: #f0f0f0;
border: 1px dotted;
padding: 5px;
margin-left: 10%; margin-right:10%;
}

div.abstract-title
{ text-align: center;
padding: 5px;
font-size: 120%;
font-weight: bold;
}

div.toc-h1
{ font-size: 200%;
font-weight: bold;
}

div.toc-h2
{ font-size: 120%;
font-weight: bold;
margin-left: 2em;
}

div.toc-h3
{ font-size: 100%;
font-weight: bold;
margin-left: 4em;
}

div.toc-h4
{ font-size: 100%;
margin-left: 6em;
}

span.sec-nr
{
}

span.sec-title
{
}

span.pred-ext
{ font-weight: bold;
}

span.pred-tag
{ float: right;
padding-top: 0.2em;
font-size: 80%;
font-style: italic;
color: #fff;
}

div.caption
{ width: 80%;
margin: auto;
text-align:center;
}

/* Footnotes */
.fn {
color: red;
font-size: 70%;
}

.fn-text, .fnp {
position: absolute;
top: auto;
left: 10%;
border: 1px solid #000;
box-shadow: 5px 5px 5px #888;
display: none;
background: #fff;
color: #000;
margin-top: 25px;
padding: 8px 12px;
font-size: larger;
}

sup:hover span.fn-text
{ display: block;
}

/* Lists */

dl.latex
{ margin-top: 1ex;
margin-bottom: 0.5ex;
}

dl.latex dl.latex dd.defbody
{ margin-bottom: 0.5ex;
}

/* PlDoc Tags */

dl.tags
{ font-size: 90%;
margin-left: 5ex;
margin-top: 1ex;
margin-bottom: 0.5ex;
}

dl.tags dt
{ margin-left: 0pt;
font-weight: bold;
}

dl.tags dd
{ margin-left: 3ex;
}

td.param
{ font-style: italic;
font-weight: bold;
}

/* Index */

dt.index-sep
{ font-weight: bold;
font-size: +1;
margin-top: 1ex;
}

/* Tables */

table.center
{ margin: auto;
}

table.latex
{ border-collapse:collapse;
}

table.latex tr
{ vertical-align: text-top;
}

table.latex td,th
{ padding: 2px 1em;
}

table.latex tr.hline td,th
{ border-top: 1px solid black;
}

table.frame-box
{ border: 2px solid black;
}

</style>
</head>
<body style="background:white">
<div class="navigate"><a class="nav" href="index.html"><img src="home.gif" alt="Home"></a>
<a class="nav" href="Contents.html"><img src="index.gif" alt="Contents"></a>
<a class="nav" href="DocIndex.html"><img src="yellow_pages.gif" alt="Index"></a>
<a class="nav" href="summary.html"><img src="info.gif" alt="Summary"></a>
<a class="nav" href="format.html"><img src="prev.gif" alt="Previous"></a>
<a class="nav" href="system.html"><img src="next.gif" alt="Next"></a>
</div>
<h2 id="sec:tty"><a id="sec:4.33"><span class="sec-nr">4.33</span> <span class="sec-title">Terminal 
Control</span></a></h2>

<a id="sec:tty"></a>

<p>The following predicates form a simple access mechanism to the Unix 
termcap library to provide terminal-independent I/O for screen 
terminals. These predicates are only available on Unix machines. The 
SWI-Prolog Windows console accepts the ANSI escape sequences.

<dl class="latex">
<dt class="pubdef"><a id="tty_get_capability/3"><strong>tty_get_capability</strong>(<var>+Name, 
+Type, -Result</var>)</a></dt>
<dd class="defbody">
Get the capability named <var>Name</var> from the termcap library. See 
termcap(5) for the capability names. <var>Type</var> specifies the type 
of the expected result, and is one of <code>string</code>, <code>number</code> 
or
<code>bool</code>. String results are returned as an atom, number 
results as an integer, and bool results as the atom <code>on</code> or <code>off</code>. 
If an option cannot be found, this predicate fails silently. The results 
are only computed once. Successive queries on the same capability are 
fast.
</dd>
<dt class="pubdef"><a id="tty_goto/2"><strong>tty_goto</strong>(<var>+X, 
+Y</var>)</a></dt>
<dd class="defbody">
Goto position (<var>X</var>, <var>Y</var>) on the screen. Note that the 
predicates
<a id="idx:linecount2:1241"></a><a class="pred" href="streamstat.html#line_count/2">line_count/2</a> 
and <a id="idx:lineposition2:1242"></a><a class="pred" href="streamstat.html#line_position/2">line_position/2</a> 
will not have a well-defined behaviour while using this predicate.
</dd>
<dt class="pubdef"><a id="tty_put/2"><strong>tty_put</strong>(<var>+Atom, 
+Lines</var>)</a></dt>
<dd class="defbody">
Put an atom via the termcap library function tputs(). This function 
decodes padding information in the strings returned by <a id="idx:ttygetcapability3:1243"></a><a class="pred" href="tty.html#tty_get_capability/3">tty_get_capability/3</a> 
and should be used to output these strings. <var>Lines</var> is the 
number of lines affected by the operation, or 1 if not applicable (as in 
almost all cases).
</dd>
<dt class="pubdef"><a id="tty_size/2"><strong>tty_size</strong>(<var>-Rows, 
-Columns</var>)</a></dt>
<dd class="defbody">
Determine the size of the terminal. Platforms:

<dl class="latex">
<dt><b>Unix</b></dt>
<dd>
If the system provides <em>ioctl</em> calls for this, these are used and <a id="idx:ttysize2:1244"></a><a class="pred" href="tty.html#tty_size/2">tty_size/2</a> 
properly reflects the actual size after a user resize of the window. As 
a fallback, the system uses
<a id="idx:ttygetcapability3:1245"></a><a class="pred" href="tty.html#tty_get_capability/3">tty_get_capability/3</a> 
using <code>li</code> and <code>co</code> capabilities. In this case the 
reported size reflects the size at the first call and is not updated 
after a user-initiated resize of the terminal.</dd>
<dt><b>Windows</b></dt>
<dd>
Getting the size of the terminal is provided for <b>swipl-win.exe</b>. 
The requested value reflects the current size. For the multithreaded 
version the console that is associated with the
<code>user_input</code> stream is used.
</dd>
</dl>

</dd>
</dl>

<p></body></html>
swi-prolog-nox 6.6.4-2ubuntu1 / usr / lib / swi-prolog / doc / Manual / tty.html
