87 lines
3.2 KiB
HTML
87 lines
3.2 KiB
HTML
<html>
|
|
<head>
|
|
<!-- This file has been generated by unroff 1.0, 03/21/96 19:29:47. -->
|
|
<!-- Do not edit! -->
|
|
<link rev="made" href="mailto:net@informatik.uni-bremen.de">
|
|
<title>unroff Programmer's Manual, section 13.</title>
|
|
</head><body>
|
|
<h2><a name="section13">13.</a> <tt> </tt>Miscellaneous Primitives
|
|
</h2>
|
|
<p>
|
|
 <tt> </tt> <tt> </tt> <tt> </tt>The first two primitives described in this section are not essential,
|
|
as the same function could be achieved with pipe streams,
|
|
although with greater overhead.<tt> </tt>
|
|
The remaining primitives perform a number of troff-specific operations
|
|
and are only useful in a few specialized contexts.<tt> </tt>
|
|
<h2>
|
|
(shell-command <i>command</i>)
|
|
</h2>
|
|
<p>
|
|
 <tt> </tt> <tt> </tt> <tt> </tt>Runs the specified
|
|
<i>command
|
|
</i>(which must be a string) as a shell command by passing it to a call to
|
|
<i>system</i>(3).<tt> </tt>
|
|
The return value is that of
|
|
<i>system()
|
|
</i>(an integer).<tt> </tt>
|
|
<h2>
|
|
(remove-file <i>filename</i>)
|
|
</h2>
|
|
<p>
|
|
 <tt> </tt> <tt> </tt> <tt> </tt>Removes the specified file;
|
|
<i>filename
|
|
</i>must be a string or a symbol.<tt> </tt>
|
|
<h2>
|
|
(troff-compatible?)
|
|
</h2>
|
|
<p>
|
|
 <tt> </tt> <tt> </tt> <tt> </tt>This predicate returns #t if troff compatibility mode has been
|
|
enabled (i.e. if the option
|
|
<b>-C
|
|
</b>has been given), otherwise #f.<tt> </tt>
|
|
<h2>
|
|
(set-escape! <i>char</i>)
|
|
</h2>
|
|
<p>
|
|
 <tt> </tt> <tt> </tt> <tt> </tt>Sets the troff escape character (initially `\') to the specified
|
|
character argument.<tt> </tt>
|
|
This primitive is used to implement the ``.ec'' request.<tt> </tt>
|
|
<h2>
|
|
<a name=".filter-eqn-line">(filter-eqn-line <i>string</i>)</a></h2>
|
|
<p>
|
|
 <tt> </tt> <tt> </tt> <tt> </tt>This primitive scans the string argument (which is supposed to
|
|
be passed to the
|
|
<i>eqn
|
|
</i>preprocessor afterwards) for occurrences of the ``delim'' directive.<tt> </tt>
|
|
If a ``delim'' directive is found, the current inline equation
|
|
delimiters maintained by the parser are changed or disabled as specified by
|
|
the directive.<tt> </tt>
|
|
The primitive returns #f if
|
|
<i>string
|
|
</i>is empty or consists just of white space, or if it contains
|
|
a valid ``delim'' or ``define'' directive, otherwise #t.<tt> </tt>
|
|
The inline equation delimiters are disabled initially.<tt> </tt>
|
|
<p>
|
|
 <tt> </tt> <tt> </tt> <tt> </tt>The primitive is supposed to be used by implementations of
|
|
the request ``.EQ'' and inline equation event handlers to intercept the
|
|
<i>eqn
|
|
</i>input.<tt> </tt>
|
|
In this case, the
|
|
<i>eqn
|
|
</i>preprocessor need only be invoked if
|
|
<i>filter-eqn-line
|
|
</i>returned #t at least once.<tt> </tt>
|
|
<h2>
|
|
(skip-group)
|
|
</h2>
|
|
<p>
|
|
 <tt> </tt> <tt> </tt> <tt> </tt>This primitive reads input lines from the current input stream
|
|
and scans them for the escape sequences `\{' and `\}' until
|
|
the nesting level of conditional input is balanced (i.e. until
|
|
a matching closing brace for an initial opening brace has been found).<tt> </tt>
|
|
The primitive is only useful for the implementation of the
|
|
troff requests for conditional input.<tt> </tt>
|
|
<p><hr>
|
|
Markup created by <em>unroff</em> 1.0, <tt> </tt> <tt> </tt>March 21, 1996, <tt> </tt> <tt> </tt>net@informatik.uni-bremen.de</body>
|
|
</html>
|