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<TeXmacs|1.0.7.14>
<style|tmdoc>
<\body>
<tmdoc-title|Output channels, prompts and default input>
Besides blocks of the form
<\quotation>
<framed-fragment|<verbatim|<render-key|DATA_BEGIN><em|format>:<em|message><render-key|DATA_END>>>
</quotation>
the <TeXmacs> meta-format also allows you to use blocks of the form
<\quotation>
<framed-fragment|<verbatim|<render-key|DATA_BEGIN><em|channel>#<em|message><render-key|DATA_END>>>
</quotation>
Here <verbatim|<em|channel>> specifies an ``output channel'' to which the
body <verbatim|<em|message>> has to be sent. The default output channel is
<verbatim|output>, but we also provide channels <verbatim|prompt> and
<verbatim|input> for specifying the prompt and a default input for the next
input in a session. Default inputs may be useful for instance be useful for
demo modes of computer algebra systems. In the future, we also plan to
support <verbatim|error> and <verbatim|status> channels.
<paragraph*|The <verbatim|prompt> plug-in>
The <verbatim|prompt> plug-in shows how to use prompts. It consists of the
files
<\verbatim>
\ \ \ \ <example-plugin-link|prompt/Makefile>
\ \ \ \ <example-plugin-link|prompt/progs/init-prompt.scm>
\ \ \ \ <example-plugin-link|prompt/src/prompt.cpp>
</verbatim>
The routine for displaying the next prompt is given by
<\cpp-code>
void
next_input () {
\ \ counter++;
\ \ cout \<less\>\<less\> DATA_BEGIN \<less\>\<less\> "prompt#";
\ \ cout \<less\>\<less\> "Input " \<less\>\<less\> counter
\<less\>\<less\> "] ";
\ \ cout \<less\>\<less\> DATA_END;
}
</cpp-code>
This routine is both used for displaying the startup banner
<\cpp-code>
cout \<less\>\<less\> DATA_BEGIN \<less\>\<less\> "verbatim:";
cout \<less\>\<less\> "A LaTeX -\<gtr\> TeXmacs converter";
next_input ();
cout \<less\>\<less\> DATA_END;
cout.flush ();
</cpp-code>
and in the body of the main loop
<\cpp-code>
char buffer[100];
cin.getline (buffer, 100, '\\n');
cout \<less\>\<less\> DATA_BEGIN \<less\>\<less\> "verbatim:";
cout \<less\>\<less\> DATA_BEGIN;
cout \<less\>\<less\> "latex:$" \<less\>\<less\> buffer \<less\>\<less\>
"$";
cout \<less\>\<less\> DATA_END;
next_input ();
cout \<less\>\<less\> DATA_END;
cout.flush ();
</cpp-code>
<tmdoc-copyright|1998--2002|Joris van der Hoeven>
<tmdoc-license|Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.1
or any later version published by the Free Software Foundation; with no
Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
Texts. A copy of the license is included in the section entitled "GNU Free
Documentation License".>
</body>
<\initial>
<\collection>
<associate|language|english>
</collection>
</initial>
|
