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Linedit management
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<H3 CLASS="subsection"><A NAME="htoc282">7.29</A>&nbsp;&nbsp;Linedit management</H3><UL>
<LI><A HREF="gprolog052.html#toc232"><TT>get_linedit_prompt/1</TT></A>
<LI><A HREF="gprolog052.html#toc233"><TT>set_linedit_prompt/1</TT></A>
<LI><A HREF="gprolog052.html#toc234"><TT>add_linedit_completion/1</TT></A>
<LI><A HREF="gprolog052.html#toc235"><TT>find_linedit_completion/2</TT></A>
</UL>

The following predicates are only available if the <TT>linedit</TT> part of
GNU Prolog has been installed.<BR>
<BR>
<A NAME="toc232"></A>
<H4 CLASS="subsubsection"><A NAME="htoc283">7.29.1</A>&nbsp;&nbsp;<TT>get_linedit_prompt/1</TT></H4>
 
<B>Templates</B>
<DL CLASS="list" COMPACT="compact"><DT CLASS="dt-list"><DD CLASS="dd-list"><TT>
get_linedit_prompt(?atom)</TT></DL>
<B>Description</B><BR>
<BR>
<TT>get_linedit_prompt(Prompt)</TT> succeeds if <TT>Prompt</TT> is the
current <TT>linedit</TT> prompt, e.g. the top-level prompt is
<TT>'| ?-'</TT>. By default all other reads have an empty prompt.<BR>
<BR>
<B>Errors</B><BR>
<TABLE CELLSPACING=2 CELLPADDING=0>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Prompt</TT> is neither a variable nor an atom</TD>
<TD VALIGN=top ALIGN=center NOWRAP>&nbsp;&nbsp;</TD>
<TD VALIGN=top ALIGN=left><TT>type_error(atom, Pred)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR></TABLE><BR>
<B>Portability</B><BR>
<BR>
GNU Prolog predicate.<BR>
<BR>
<A NAME="toc233"></A>
<H4 CLASS="subsubsection"><A NAME="htoc284">7.29.2</A>&nbsp;&nbsp;<TT>set_linedit_prompt/1</TT></H4>
 
<B>Templates</B>
<DL CLASS="list" COMPACT="compact"><DT CLASS="dt-list"><DD CLASS="dd-list"><TT>
set_linedit_prompt(+atom)</TT></DL>
<B>Description</B><BR>
<BR>
<TT>set_linedit_prompt(Prompt)</TT> sets the current <TT>linedit</TT>
prompt to <TT>Prompt</TT>. This prompt will be displayed for reads from a
terminal (except for top-level reads).<BR>
<BR>
<B>Errors</B><BR>
<TABLE CELLSPACING=2 CELLPADDING=0>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Prompt</TT> is a variable</TD>
<TD VALIGN=top ALIGN=center NOWRAP>&nbsp;&nbsp;</TD>
<TD VALIGN=top ALIGN=left><TT>instantiation_error</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Prompt</TT> is neither a variable nor an atom</TD>
<TD VALIGN=top ALIGN=center NOWRAP>&nbsp;&nbsp;</TD>
<TD VALIGN=top ALIGN=left><TT>type_error(atom, Pred)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR></TABLE><BR>
<B>Portability</B><BR>
<BR>
GNU Prolog predicate.<BR>
<BR>
<A NAME="toc234"></A>
<H4 CLASS="subsubsection"><A NAME="htoc285">7.29.3</A>&nbsp;&nbsp;<TT>add_linedit_completion/1</TT></H4>
 
<B>Templates</B>
<DL CLASS="list" COMPACT="compact"><DT CLASS="dt-list"><DD CLASS="dd-list"><TT>
add_linedit_completion(+atom)</TT></DL>
<B>Description</B><BR>
<BR>
<TT>add_linedit_completion(Word)</TT> adds <TT>Word</TT> in the list of
completion words maintained by <TT>linedit</TT>
(section&nbsp;<A HREF="gprolog006.html#The-line-editor">3.2.5</A>). Only words containing letters, digits and
the underscore character are added (if <TT>Word</TT> does not respect
this restriction the predicate fails).<BR>
<BR>
<B>Errors</B><BR>
<TABLE CELLSPACING=2 CELLPADDING=0>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Word</TT> is a variable</TD>
<TD VALIGN=top ALIGN=center NOWRAP>&nbsp;&nbsp;</TD>
<TD VALIGN=top ALIGN=left><TT>instantiation_error</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Word</TT> is neither a variable nor an atom</TD>
<TD VALIGN=top ALIGN=center NOWRAP>&nbsp;&nbsp;</TD>
<TD VALIGN=top ALIGN=left><TT>type_error(atom, Word)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR></TABLE><BR>
<B>Portability</B><BR>
<BR>
GNU Prolog predicate.<BR>
<BR>
<A NAME="toc235"></A>
<H4 CLASS="subsubsection"><A NAME="htoc286">7.29.4</A>&nbsp;&nbsp;<TT>find_linedit_completion/2</TT></H4>
 
<B>Templates</B>
<DL CLASS="list" COMPACT="compact"><DT CLASS="dt-list"><DD CLASS="dd-list"><TT>
find_linedit_completion(+atom, ?atom)</TT></DL>
<B>Description</B><BR>
<BR>
<TT>find_linedit_completion(Prefix, Word)</TT> succeeds if <TT>Word</TT>
is a word beginning by <TT>Prefix</TT> and belongs to the list of
completion words maintained by <TT>linedit</TT>
(section&nbsp;<A HREF="gprolog006.html#The-line-editor">3.2.5</A>). This predicate is re-executable on backtracking.<BR>
<BR>
<B>Errors</B><BR>
<TABLE CELLSPACING=2 CELLPADDING=0>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Prefix</TT> is a variable</TD>
<TD VALIGN=top ALIGN=center NOWRAP>&nbsp;&nbsp;</TD>
<TD VALIGN=top ALIGN=left><TT>instantiation_error</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Prefix</TT> is neither a variable nor an atom</TD>
<TD VALIGN=top ALIGN=center NOWRAP>&nbsp;&nbsp;</TD>
<TD VALIGN=top ALIGN=left><TT>type_error(atom, Prefix)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Word</TT> is neither a variable nor an atom</TD>
<TD VALIGN=top ALIGN=center NOWRAP>&nbsp;&nbsp;</TD>
<TD VALIGN=top ALIGN=left><TT>type_error(atom, Word)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR></TABLE><BR>
<B>Portability</B><BR>
<BR>
GNU Prolog predicate.<BR>
<BR>

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