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<html><head><title>Term::ReadLine (Perl in a Nutshell, 2nd Edition)</title><link rel="stylesheet" type="text/css" href="../style/style1.css" /><meta name="DC.Creator" content="Stephen Spainhour" /><meta name="DC.Format" content="text/xml" scheme="MIME" /><meta name="DC.Language" content="en-US" /><meta name="DC.Publisher" content="O'Reilly & Associates, Inc." /><meta name="DC.Source" scheme="ISBN" content="0596002416L" /><meta name="DC.Subject.Keyword" content="stuff" /><meta name="DC.Title" content="Perl in a Nutshell, 2nd Edition" /><meta name="DC.Type" content="Text.Monograph" /></head><body bgcolor="#ffffff"><img src="gifs/smbanner.gif" usemap="#banner-map" border="0" alt="Book Home" /><map name="banner-map"><area shape="rect" coords="1,-2,616,66" href="index.htm" alt="Java and XSLT" /><area shape="rect" coords="629,-11,726,25" href="jobjects/fsearch.htm" alt="Search this book" /></map><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch08_197.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228" /><td align="right" valign="top" width="228"><a href="ch08_199.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr></table></div><h2 class="sect1">8.198. Term::ReadLine</h2><p><a name="INDEX-1562" />Frontend to other ReadLine packages.Currently interfaces to Term-ReadLine, which is available on CPAN.Defines the variables <tt class="literal">$IN</tt> and<tt class="literal">$OUT</tt>, which return the filehandles for input andoutput, respectively, or <tt class="literal">undef</tt> if Readline inputand output cannot be used for Perl. Provides the following methods.</p><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>new</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">term</em> = new Term::ReadLine '<em class="replaceable">name</em>'</pre><p>Constructor. Returns the handle for subsequent calls to otherReadLine methods. Argument <em class="replaceable"><tt>name</tt></em> is thename of the application. Optionally can be followed by two argumentsthat are globs specifying input and output filehandles.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>addhistory</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">term</em>->addhistory(<em class="replaceable">line</em>)</pre><p>Adds <em class="replaceable">line</em> to the input history.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>Features</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">term</em>->Features</pre><p>Returns a reference to a hash whose keys are features present in thecurrent implementation and whose values are assigned to each feature.Several optional features are used in the minimal interface:</p><dl><dt><i><em class="emphasis">appname</em></i></dt><dd>Should be present if the first argument to <tt class="literal">new</tt> isrecognized</p></dd><dt><i><em class="emphasis">minline</em></i></dt><dd>Should be present if <tt class="literal">MinLine</tt> method is not a dummy</p></dd><dt><i><em class="emphasis">autohistory</em></i></dt><dd>Should be present if lines are put into history automatically (maybesubject to <em class="emphasis">MinLine</em>)</p></dd><dt><i><em class="emphasis">addhistory</em></i></dt><dd>Should be present if the <tt class="literal">addhistory</tt> method is nota dummy</p></dd></dl></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>findConsole</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">term</em>->findConsole</pre><p>Returns array of two strings containing the most appropriate namesfor input and output files, using the conventions<tt class="literal"><$in</tt> and <tt class="literal">>$out</tt>.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>MinLine</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">term</em>->MinLine([<em class="replaceable">size</em>])</pre><p>With <em class="replaceable">size</em> argument, serves as arecommendation on minimal size of line to be added to history.Without an argument, does not add anything to the history. Returnsthe old value.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>ReadLine</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">term</em>->ReadLine</pre><p>Returns the actual package that executes the commands. Some possiblevalues are <tt class="literal">Term::ReadLine::Gnu</tt>,<tt class="literal">Term::ReadLine::Perl</tt>, or<tt class="literal">Term::ReadLine::Stub</tt>.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>readline</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>$<em class="replaceable">term</em>->readline(<em class="replaceable">prompt</em>)</pre><p>Prompts for input line and gets the result. Removes trailing newlineand returns <tt class="literal">undef</tt> at end-of-file.</p></div><hr width="684" align="left" /><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch08_197.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228"><a href="index.htm"><img src="../gifs/txthome.gif" alt="Home" border="0" /></a></td><td align="right" valign="top" width="228"><a href="ch08_199.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr><tr><td align="left" valign="top" width="228">8.197. Term::Complete</td><td align="center" valign="top" width="228"><a href="index/index.htm"><img src="../gifs/index.gif" alt="Book Index" border="0" /></a></td><td align="right" valign="top" width="228">8.199. 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