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| author | jpayne |
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| date | Tue, 18 Mar 2025 16:23:26 -0400 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/share/doc/libtextstyle/libtextstyle_3.html Tue Mar 18 16:23:26 2025 -0400 @@ -0,0 +1,1109 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html401/loose.dtd"> +<html> +<!-- Created on February, 21 2024 by texi2html 1.78a --> +<!-- +Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author) + Karl Berry <karl@freefriends.org> + Olaf Bachmann <obachman@mathematik.uni-kl.de> + and many others. +Maintained by: Many creative people. +Send bugs and suggestions to <texi2html-bug@nongnu.org> + +--> +<head> +<title>GNU libtextstyle: 3. The programmer's perspective</title> + +<meta name="description" content="GNU libtextstyle: 3. The programmer's perspective"> +<meta name="keywords" content="GNU libtextstyle: 3. The programmer's perspective"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="texi2html 1.78a"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +pre.display {font-family: serif} +pre.format {font-family: serif} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: serif; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: serif; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.roman {font-family:serif; font-weight:normal;} +span.sansserif {font-family:sans-serif; font-weight:normal;} +ul.toc {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> + +<table cellpadding="1" cellspacing="1" border="0"> +<tr><td valign="middle" align="left">[<a href="libtextstyle_2.html#SEC4" title="Beginning of this chapter or previous chapter"> << </a>]</td> +<td valign="middle" align="left">[<a href="libtextstyle_4.html#SEC38" title="Next chapter"> >> </a>]</td> +<td valign="middle" align="left"> </td> +<td valign="middle" align="left"> </td> +<td valign="middle" align="left"> </td> +<td valign="middle" align="left"> </td> +<td valign="middle" align="left"> </td> +<td valign="middle" align="left">[<a href="libtextstyle_toc.html#SEC_Top" title="Cover (top) of document">Top</a>]</td> +<td valign="middle" align="left">[<a href="libtextstyle_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td> +<td valign="middle" align="left">[<a href="libtextstyle_5.html#SEC46" title="Index">Index</a>]</td> +<td valign="middle" align="left">[<a href="libtextstyle_abt.html#SEC_About" title="About (help)"> ? </a>]</td> +</tr></table> + +<hr size="2"> +<a name="The-programmer_0027s-view"></a> +<a name="SEC15"></a> +<h1 class="chapter"> <a href="libtextstyle_toc.html#TOC15">3. The programmer's perspective</a> </h1> + +<p>As a programmer, enabling styling consists of the following tasks: +</p><ol> +<li> +Define the command-line options and environment variable that the user +can use to control the styling. +</li><li> +Define the CSS classes that the user can use in the CSS file. Each CSS +class corresponds to a text role; each CSS class can be given a different +styling by the user. +</li><li> +Change the output routines so that they take an ‘<samp>ostream_t</samp>’ object +as argument instead of a ‘<samp>FILE *</samp>’. +</li><li> +Insert paired invocations to <code>styled_ostream_begin_css_class</code>, +<code>styled_ostream_end_css_class</code> around each run of text with a +specific text role. +</li><li> +Link with <code>libtextstyle</code>. If your package is using GNU autoconf, +you can use the <code>libtextstyle.m4</code> macro from Gnulib. +</li><li> +Prepare a default style file. +</li><li> +Update the documentation of your package. +</li></ol> + +<p>The following sections go into more detail. +</p> + + +<a name="Basic-use"></a> +<a name="SEC16"></a> +<h2 class="section"> <a href="libtextstyle_toc.html#TOC16">3.1 Basic use of libtextstyle</a> </h2> + +<p>Source code that makes use of GNU libtextstyle needs an include statement: +</p> +<table><tr><td> </td><td><pre class="smallexample">#include <textstyle.h> +</pre></td></tr></table> + +<p>Basic use of GNU libtextstyle consists of statements like these: +</p> +<table><tr><td> </td><td><pre class="smallexample"> styled_ostream_t stream = + styled_ostream_create (STDOUT_FILENO, "(stdout)", TTYCTL_AUTO, + style_file_name); + ... + styled_ostream_begin_use_class (stream, css_class); + ... + ostream_write_str (stream, string); + ... + styled_ostream_end_use_class (stream, css_class); + ... + styled_ostream_free (stream); +</pre></td></tr></table> + +<p>Before this snippet, your code needs to determine the name of the style +file to use (<code>style_file_name</code>). If no styling is desired – the +precise condition depends on the value of <code>color_mode</code> but also on +your application logic –, you should set <code>style_file_name</code> to +<code>NULL</code>. +</p> +<p>An object of type <code>styled_ostream_t</code> is allocated. The function +<code>styled_ostream_create</code> allocates it; the function +<code>styled_ostream_free</code> deallocates it. +</p> +<p>Such <code>styled_ostream_t</code> supports output operations +(<code>ostream_write_str</code>), interleaved with adding and removing CSS +classes. The CSS class in effect when an output operation is performed +determines, through the style file, the text attributes associated with +that piece of text. +</p> + + +<a name="Hyperlinks"></a> +<a name="SEC17"></a> +<h3 class="subsection"> <a href="libtextstyle_toc.html#TOC17">3.1.1 Hyperlinks</a> </h3> + +<p>Text output may contain hyperlinks. These hyperlinks are encoded through +an escape sequence, specified at +<a href="https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda">Hyperlinks in terminal emulators</a>. Currently (as of 2019), they are +displayed only in <code>gnome-terminal</code> version 3.26 or above. More +terminal emulators will support hyperlinks in the future. Terminal +emulators which don't support hyperlinks ignore it, except for a few +terminal emulators, for which users may need to disable the hyperlinks +(see <a href="libtextstyle_2.html#SEC9">The environment variable <code>NO_TERM_HYPERLINKS</code></a>) if the heuristic built into +<code>libtextstyle</code> does not already disable them. +</p> +<p>To emit a hyperlink, use code like this: +</p> +<table><tr><td> </td><td><pre class="smallexample"> styled_ostream_t stream = ... + ... + /* Start a hyperlink. */ + styled_ostream_set_hyperlink (stream, url, NULL); + ... + /* Emit the anchor text. This can be styled text. */ + ostream_write_str (stream, "Click here!"); + ... + /* End the current hyperlink. */ + styled_ostream_set_hyperlink (stream, NULL, NULL); +</pre></td></tr></table> + +<p>The anchor text can be styled. But the hyperlinks themselves cannot be +styled; they behave as implemented by the terminal emulator. +</p> + +<a name="Include-files"></a> +<a name="SEC18"></a> +<h2 class="section"> <a href="libtextstyle_toc.html#TOC18">3.2 Include files</a> </h2> + +<p>The include file <code><textstyle.h></code> declares all facilities defined by +the library. +</p> + +<a name="Link-options"></a> +<a name="SEC19"></a> +<h2 class="section"> <a href="libtextstyle_toc.html#TOC19">3.3 Link options</a> </h2> + +<p>The library to link with is called <code>libtextstyle</code>, with a +system-dependent suffix. You link with it though link options of the +form <code>-ltextstyle</code> for a library installed in system locations, or +<code>-L<var>libdir</var> -ltextstyle</code> for a static library installed in other +locations, or <code>-L<var>libdir</var> -ltextstyle -Wl,-rpath,<var>libdir</var></code> +for a shared library installed in other locations (assuming a GCC +compatible compiler and linker and no <code>libtool</code>), or +<code>-L<var>libdir</var> -ltextstyle -R<var>libdir</var></code> for a shared library +installed in other locations (with <code>libtool</code>). Additionally, the +link options may need to include the dependencies: <code>-lm</code>, and +<code>-lncurses</code> or (on NetBSD) <code>-ltermcap</code> or (on AIX) +<code>-lxcurses</code> or (on HP-UX) <code>-lcurses</code>, and on some systems also +<code>-liconv</code>. +</p> +<p>It is a bit complicated to determine the right link options in a portable +way. Therefore an Autoconf macro is provided in the file +<code>libtextstyle.m4</code> in Gnulib, that makes this task easier. Assuming +the build system of your package is based on GNU Autoconf, you invoke it +through <code>gl_LIBTEXTSTYLE</code>. It searches for an installed +<code>libtextstyle</code>. If found, it sets and AC_SUBSTs +<code>HAVE_LIBTEXTSTYLE=yes</code> and the <code>LIBTEXTSTYLE</code> and +<code>LTLIBTEXTSTYLE</code> variables, and augments the <code>CPPFLAGS</code> +variable, and #defines <code>HAVE_LIBTEXTSTYLE</code> to 1. Otherwise, it sets +and AC_SUBSTs <code>HAVE_LIBTEXTSTYLE=no</code> and <code>LIBTEXTSTYLE</code> and +<code>LTLIBTEXTSTYLE</code> to empty. In link commands that use <code>libtool</code>, +use <code>LTLIBTEXTSTYLE</code>; in link commands that don't use <code>libtool</code>, +use <code>LIBTEXTSTYLE</code>. +</p> +<p>If you use GNU Automake, the proper place to use the link options is +<code><var>program</var>_LDADD</code> for programs and <code><var>library</var>_LIBADD</code> +for libraries. +</p> + +<a name="Command_002dline-options"></a> +<a name="SEC20"></a> +<h2 class="section"> <a href="libtextstyle_toc.html#TOC20">3.4 Command-line options</a> </h2> + +<p>While you are free to provide any command-line option to enable the +styling of the output, it is good if different GNU programs use the same +command-line options for this purpose. These options are described in +the sections <a href="libtextstyle_2.html#SEC11">The <code>--color</code> option</a> and <a href="libtextstyle_2.html#SEC12">The <code>--style</code> option</a>. To +achieve this, use the following API (declared in <code><textstyle.h></code>): +</p> +<dl> +<dt><u>Variable:</u> bool <b>color_test_mode</b> +<a name="IDX1"></a> +</dt> +<dd><p>True if a <code>--color</code> option with value <code>test</code> has been seen. +</p></dd></dl> + +<dl> +<dt><u>Variable:</u> enum color_option <b>color_mode</b> +<a name="IDX2"></a> +</dt> +<dd><p>Stores the value of the <code>--color</code> option. +</p></dd></dl> + +<dl> +<dt><u>Variable:</u> const char * <b>style_file_name</b> +<a name="IDX3"></a> +</dt> +<dd><p>Stores the value of the <code>--style</code> option. +</p></dd></dl> + +<p>Note: These variables, like any variables exported from shared libraries, +can only be used in executable code. You <em>cannot</em> portably use +their address in initializers of global or static variables. This is a +restriction that is imposed by the Windows, Cygwin, and Android platforms. +</p> +<dl> +<dt><u>Function:</u> bool <b>handle_color_option</b><i> (const char *<var>option</var>)</i> +<a name="IDX4"></a> +</dt> +<dd><p>You invoke this function when, during argument parsing, you have +encountered a <code>--color</code> or <code>--color=...</code> option. The return +value is an error indicator: <code>true</code> means an invalid option. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>handle_style_option</b><i> (const char *<var>option</var>)</i> +<a name="IDX5"></a> +</dt> +<dd><p>You invoke this function when, during argument parsing, you have +encountered a <code>--style</code> or <code>--style=...</code> option. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>print_color_test</b><i> (void)</i> +<a name="IDX6"></a> +</dt> +<dd><p>Prints a color test page. You invoke this function after argument +parsing, when the <code>color_test_mode</code> variable is true. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>style_file_prepare</b><i> (const char *<var>style_file_envvar</var>, const char *<var>stylesdir_envvar</var>, const char *<var>stylesdir_after_install</var>, const char *<var>default_style_file</var>)</i> +<a name="IDX7"></a> +</dt> +<dd><p>Assigns a default value to <code>style_file_name</code> if necessary. You +invoke this function after argument parsing, when <code>color_test_mode</code> +is false. +</p> +<p><code><var>style_file_envvar</var></code> is an environment variable that, when set +to a non-empty value, specifies the style file to use. This environment +variable is meant to be set by the user. +</p> +<p><code><var>stylesdir_envvar</var></code> is an environment variable that, when set +to a non-empty value, specifies the directory with the style files, or +<code>NULL</code>. This is necessary for running the testsuite before +‘<samp>make install</samp>’. +</p> +<p><code><var>stylesdir_after_install</var></code> is the directory with the style +files after ‘<samp>make install</samp>’. +</p> +<p><code><var>default_style_file</var></code> is the file name of the default style +file, relative to <var>stylesdir</var>. +</p></dd></dl> + + +<a name="The-output-stream-hierarchy"></a> +<a name="SEC21"></a> +<h2 class="section"> <a href="libtextstyle_toc.html#TOC21">3.5 The output stream hierarchy</a> </h2> + +<p>There are various classes of output streams, some of them with styling +support. These “classes” are defined in an object-oriented programming +style that resembles C++ or Java, but are actually implemented in C with +a little bit of object orientation syntax. These definitions are +preprocessed down to C. As a consequence, GNU libtextstyle is a C +library and does not need to link with the C++ standard library. +</p> +<p>All these classes are declared in <code><textstyle.h></code>. +</p> +<p>The base output stream type is ‘<samp>ostream_t</samp>’. It is a pointer type to +a (hidden) implementation type. Similarly for the subclasses. +</p> +<p>When we say that ‘<samp>some_ostream_t</samp>’ is a subclass of ‘<samp>ostream_t</samp>’, +what we mean is: +</p><ul> +<li> +Every ‘<samp>some_ostream_t</samp>’ object can be converted to an +‘<samp>ostream_t</samp>’, by virtue of a simple assignment. No cast is needed. +</li><li> +The opposite conversion, from ‘<samp>ostream_t</samp>’ to ‘<samp>some_ostream_t</samp>’, +can also be performed, provided that the object is actually an instance +of ‘<samp>some_ostream_t</samp>’. You can test whether an object is an instance +of ‘<samp>some_ostream_t</samp>’ by invoking the method +‘<samp>bool is_instance_of_some_ostream (ostream_t stream)</samp>’. +<a name="IDX8"></a> +<a name="IDX9"></a> +<a name="IDX10"></a> +<a name="IDX11"></a> +<a name="IDX12"></a> +<a name="IDX13"></a> +<a name="IDX14"></a> +<a name="IDX15"></a> +<a name="IDX16"></a> +<a name="IDX17"></a> +</li><li> +Every method ‘<samp>ostream_<var>foobar</var></samp>’ exists also as a method +‘<samp>some_ostream_<var>foobar</var></samp>’ with compatible argument types and a +compatible return type. +</li></ul> + + + +<a name="The-ostream-class"></a> +<a name="SEC22"></a> +<h3 class="subsection"> <a href="libtextstyle_toc.html#TOC22">3.5.1 The abstract <code>ostream</code> class</a> </h3> + +<p>The base output stream type is ‘<samp>ostream_t</samp>’. +</p> +<p>It has the following methods: +</p> +<dl> +<dt><u>Function:</u> void <b>ostream_write_mem</b><i> (ostream_t <var>stream</var>, const void *<var>data</var>, size_t <var>len</var>)</i> +<a name="IDX18"></a> +</dt> +<dd><p>Writes a sequence of bytes to a stream. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>ostream_write_str</b><i> (ostream_t <var>stream</var>, const char *<var>string</var>)</i> +<a name="IDX19"></a> +</dt> +<dd><p>Writes a string's contents to a stream. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> ptrdiff_t <b>ostream_printf</b><i> (ostream_t <var>stream</var>, const char *<var>format</var>, ...)</i> +<a name="IDX20"></a> +</dt> +<dt><u>Function:</u> ptrdiff_t <b>ostream_vprintf</b><i> (ostream_t <var>stream</var>, const char *<var>format</var>, va_list args)</i> +<a name="IDX21"></a> +</dt> +<dd><p>Writes formatted output to a stream. +</p> +<p>These functions return the size of formatted output, or a negative value +in case of an error. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>ostream_flush</b><i> (ostream_t <var>stream</var>, ostream_flush_scope_t <var>scope</var>)</i> +<a name="IDX22"></a> +</dt> +<dd><p>Brings buffered data to its destination. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>ostream_free</b><i> (ostream_t <var>stream</var>)</i> +<a name="IDX23"></a> +</dt> +<dd><p>Closes and frees a stream. +</p></dd></dl> + + +<a name="The-styled_005fostream-class"></a> +<a name="SEC23"></a> +<h3 class="subsection"> <a href="libtextstyle_toc.html#TOC23">3.5.2 The abstract <code>styled_ostream</code> class</a> </h3> + +<p>The type for a styled output stream is ‘<samp>styled_ostream_t</samp>’. It is a +subclass of ‘<samp>ostream_t</samp>’ that adds the following methods: +</p> +<dl> +<dt><u>Function:</u> void <b>styled_ostream_begin_use_class</b><i> (styled_ostream_t <var>stream</var>, const char *<var>classname</var>)</i> +<a name="IDX24"></a> +</dt> +<dd><p>Starts a run of text belonging to <code><var>classname</var></code>. The +<code><var>classname</var></code> is the name of a CSS class. It can be chosen +arbitrarily and customized through the CSS file. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>styled_ostream_end_use_class</b><i> (styled_ostream_t <var>stream</var>, const char *<var>classname</var>)</i> +<a name="IDX25"></a> +</dt> +<dd><p>Ends a run of text belonging to <code><var>classname</var></code>. The +<code>styled_ostream_begin_use_class</code> / +<code>styled_ostream_end_use_class</code> calls must match properly. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> const char * <b>styled_ostream_get_hyperlink_ref</b><i> (styled_ostream_t <var>stream</var>)</i> +<a name="IDX26"></a> +</dt> +<dd><p>Returns the referred URL of the currently set hyperlink, or <code>NULL</code> +if no hyperlink attribute is currently set. +</p> +<p>Note: The returned string is only valid up to the next invocation of +<code>styled_ostream_set_hyperlink</code>. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> const char * <b>styled_ostream_get_hyperlink_id</b><i> (styled_ostream_t <var>stream</var>)</i> +<a name="IDX27"></a> +</dt> +<dd><p>Returns the id of the currently set hyperlink, or <code>NULL</code> if no +hyperlink attribute is currently set. +</p> +<p>Note: The returned string is only valid up to the next invocation of +<code>styled_ostream_set_hyperlink</code>. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>styled_ostream_set_hyperlink</b><i> (styled_ostream_t <var>stream</var>, const char *<var>ref</var>, const char *<var>id</var>)</i> +<a name="IDX28"></a> +</dt> +<dd><p>Sets or removes a hyperlink attribute. +</p> +<p>To set a hyperlink attribute, pass a non-<code>NULL</code> <var>ref</var>. +<var>ref</var> is an URL; it should be at most 2083 bytes long. Non-ASCII +characters should be URI-escaped (using the %nn syntax). <var>id</var> is +an optional identifier. On terminal output, multiple hyperlinks with +the same <var>id</var> will be highlighted together. If specified, <var>id</var> +should be at most 250 bytes long. +</p> +<p>To remove a hyperlink attribute, pass <code>NULL</code> for <var>ref</var> and <var>id</var>. +</p> +<p>Hyperlinks don't nest. That is, a hyperlink attribute is enabled only +up to the next invocation of <code>styled_ostream_set_hyperlink</code>. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>styled_ostream_flush_to_current_style</b><i> (styled_ostream_t <var>stream</var>)</i> +<a name="IDX29"></a> +</dt> +<dd><p>This function acts like <code>ostream_flush (<var>stream</var>, FLUSH_THIS_STREAM)</code>, +except that it leaves the destination with the current text style enabled, +instead of with the default text style. +</p> +<p>After calling this function, you can output strings without newlines(!) to the +underlying stream, and they will be rendered like strings passed to +<code>ostream_write_mem</code>, <code>ostream_write_str</code>, or <code>ostream_printf</code>. +</p></dd></dl> + + +<a name="ostream-subclasses-without-styling"></a> +<a name="SEC24"></a> +<h3 class="subsection"> <a href="libtextstyle_toc.html#TOC24">3.5.3 Concrete ostream subclasses without styling</a> </h3> + + + +<a name="The-file_005fostream-class"></a> +<a name="SEC25"></a> +<h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC25">3.5.3.1 The <code>file_ostream</code> class</a> </h4> + +<p>The <code>file_ostream</code> class supports output to an <code><stdio.h></code> +<code>FILE</code> stream. Its type is ‘<samp>file_ostream_t</samp>’. It is a subclass +of ‘<samp>ostream_t</samp>’ that adds no methods. +</p> +<p>It can be instantiated through this function: +</p> +<dl> +<dt><u>Function:</u> file_ostream_t <b>file_ostream_create</b><i> (FILE *<var>fp</var>)</i> +<a name="IDX30"></a> +</dt> +<dd><p>Creates an output stream referring to <code><var>fp</var></code>. +</p> +<p>Note: The resulting stream must be closed before <code><var>fp</var></code> can be +closed. +</p></dd></dl> + + +<a name="The-fd_005fostream-class"></a> +<a name="SEC26"></a> +<h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC26">3.5.3.2 The <code>fd_ostream</code> class</a> </h4> + +<p>The <code>file_ostream</code> class supports output to a file descriptor. Its +type is ‘<samp>fd_ostream_t</samp>’. It is a subclass of ‘<samp>ostream_t</samp>’ that +adds no methods. +</p> +<p>It can be instantiated through this function: +</p> +<dl> +<dt><u>Function:</u> fd_ostream_t <b>fd_ostream_create</b><i> (int <var>fd</var>, const char *<var>filename</var>, bool <var>buffered</var>)</i> +<a name="IDX31"></a> +</dt> +<dd><p>Creates an output stream referring to the file descriptor <code><var>fd</var></code>. +</p> +<p><code><var>filename</var></code> is used only for error messages. +</p> +<p>Note: The resulting stream must be closed before <code><var>fd</var></code> can be +closed. +</p></dd></dl> + + +<a name="The-term_005fostream-class"></a> +<a name="SEC27"></a> +<h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC27">3.5.3.3 The <code>term_ostream</code> class</a> </h4> + +<p>The <code>term_ostream</code> class supports output to a file descriptor that +is connected to a terminal emulator or console. Its type is +‘<samp>term_ostream_t</samp>’. It is a subclass of ‘<samp>ostream_t</samp>’. +</p> +<p>It can be instantiated through this function: +</p> +<dl> +<dt><u>Function:</u> term_ostream_t <b>term_ostream_create</b><i> (int <var>fd</var>, const char *<var>filename</var>, ttyctl_t <var>tty_control</var>)</i> +<a name="IDX32"></a> +</dt> +<dd><p>Creates an output stream referring to the file descriptor <code><var>fd</var></code>. +</p> +<p><code><var>filename</var></code> is used only for error messages. +</p> +<p><code><var>tty_control</var></code> specifies the amount of control to take over the +underlying tty. +</p> +<p>The resulting stream will be line-buffered. +</p> +<p>Note: The resulting stream must be closed before <code><var>fd</var></code> can be +closed. +</p></dd></dl> + +<p>The class adds the following methods: +</p> +<dl> +<dt><u>Function:</u> term_color_t <b>term_ostream_rgb_to_color</b><i> (term_ostream_t <var>stream</var>, int <var>red</var>, int <var>green</var>, int <var>blue</var>)</i> +<a name="IDX33"></a> +</dt> +<dd><p>Converts an RGB value +(<code><var>red</var></code>, <code><var>green</var></code>, <code><var>blue</var></code> in [0..255]) to +a color, valid for this stream only. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> term_color_t <b>term_ostream_get_color</b><i> (term_ostream_t <var>stream</var>)</i> +<a name="IDX34"></a> +</dt> +<dt><u>Function:</u> void <b>term_ostream_set_color</b><i> (term_ostream_t <var>stream</var>, term_color_t <var>color</var>)</i> +<a name="IDX35"></a> +</dt> +<dd><p>Gets/sets the text color. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> term_color_t <b>term_ostream_get_bgcolor</b><i> (term_ostream_t <var>stream</var>)</i> +<a name="IDX36"></a> +</dt> +<dt><u>Function:</u> void <b>term_ostream_set_bgcolor</b><i> (term_ostream_t <var>stream</var>, term_color_t <var>color</var>)</i> +<a name="IDX37"></a> +</dt> +<dd><p>Gets/sets the background color. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> term_weight_t <b>term_ostream_get_weight</b><i> (term_ostream_t <var>stream</var>)</i> +<a name="IDX38"></a> +</dt> +<dt><u>Function:</u> void <b>term_ostream_set_weight</b><i> (term_ostream_t <var>stream</var>, term_weight_t <var>weight</var>)</i> +<a name="IDX39"></a> +</dt> +<dd><p>Gets/sets the font weight. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> term_posture_t <b>term_ostream_get_posture</b><i> (term_ostream_t <var>stream</var>)</i> +<a name="IDX40"></a> +</dt> +<dt><u>Function:</u> void <b>term_ostream_set_posture</b><i> (term_ostream_t <var>stream</var>, term_posture_t <var>posture</var>)</i> +<a name="IDX41"></a> +</dt> +<dd><p>Gets/sets the font posture. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> term_underline_t <b>term_ostream_get_underline</b><i> (term_ostream_t <var>stream</var>)</i> +<a name="IDX42"></a> +</dt> +<dt><u>Function:</u> void <b>term_ostream_set_underline</b><i> (term_ostream_t <var>stream</var>, term_underline_t <var>underline</var>)</i> +<a name="IDX43"></a> +</dt> +<dd><p>Gets/sets the text underline decoration. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> const char * <b>term_ostream_get_hyperlink_ref</b><i> (term_ostream_t <var>stream</var>)</i> +<a name="IDX44"></a> +</dt> +<dd><p>Returns the referred URL of the currently set hyperlink, or <code>NULL</code> +if no hyperlink attribute is currently set. +</p> +<p>Note: The returned string is only valid up to the next invocation of +<code>term_ostream_set_hyperlink</code>. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> const char * <b>term_ostream_get_hyperlink_id</b><i> (term_ostream_t <var>stream</var>)</i> +<a name="IDX45"></a> +</dt> +<dd><p>Returns the id of the currently set hyperlink, or <code>NULL</code> if no +hyperlink attribute is currently set. +</p> +<p>Note: The returned string is only valid up to the next invocation of +<code>term_ostream_set_hyperlink</code>. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>term_ostream_set_hyperlink</b><i> (term_ostream_t <var>stream</var>, const char *<var>ref</var>, const char *<var>id</var>)</i> +<a name="IDX46"></a> +</dt> +<dd><p>Sets or removes a hyperlink attribute. +</p> +<p>To set a hyperlink attribute, pass a non-<code>NULL</code> <var>ref</var>. +<var>ref</var> is an URL; it should be at most 2083 bytes long. Non-ASCII +characters should be URI-escaped (using the %nn syntax). <var>id</var> is +an optional identifier. Multiple hyperlinks with the same <var>id</var> +will be highlighted together. If specified, <var>id</var> should be at most +250 bytes long. +</p> +<p>To remove a hyperlink attribute, pass <code>NULL</code> for <var>ref</var> and <var>id</var>. +</p> +<p>Hyperlinks don't nest. That is, a hyperlink attribute is enabled only +up to the next invocation of <code>styled_ostream_set_hyperlink</code>. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>term_ostream_flush_to_current_style</b><i> (term_ostream_t <var>stream</var>)</i> +<a name="IDX47"></a> +</dt> +<dd><p>This function acts like <code>ostream_flush (<var>stream</var>, FLUSH_THIS_STREAM)</code>, +except that it leaves the terminal with the current text attributes enabled, +instead of with the default text attributes. +</p> +<p>After calling this function, you can output strings without newlines(!) to the +underlying file descriptor, and they will be rendered like strings passed to +<code>ostream_write_mem</code>, <code>ostream_write_str</code>, or <code>ostream_printf</code>. +</p></dd></dl> + + +<a name="The-html_005fostream-class"></a> +<a name="SEC28"></a> +<h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC28">3.5.3.4 The <code>html_ostream</code> class</a> </h4> + +<p>The <code>html_ostream</code> class supports output to any destination, in HTML +syntax. Its type is ‘<samp>html_ostream_t</samp>’. It is a subclass of +‘<samp>ostream_t</samp>’. +</p> +<p>It can be instantiated through this function: +</p> +<dl> +<dt><u>Function:</u> html_ostream_t <b>html_ostream_create</b><i> (ostream_t <var>destination</var>)</i> +<a name="IDX48"></a> +</dt> +<dd><p>Creates an output stream that takes input in the UTF-8 encoding and +writes it in HTML form on <code><var>destination</var></code>. +</p> +<p>This stream produces a sequence of lines. The caller is responsible for +opening the <code><body><html></code> elements before and for closing them +after the use of this stream. +</p> +<p>Note: The resulting stream must be closed before <code><var>destination</var></code> +can be closed. +</p></dd></dl> + +<p>The class adds the following methods: +</p> +<dl> +<dt><u>Function:</u> void <b>html_ostream_begin_span</b><i> (html_ostream_t <var>stream</var>, const char *<var>classname</var>)</i> +<a name="IDX49"></a> +</dt> +<dd><p>Starts a <code><span class="<var>classname</var>"></code> element. The +<code><var>classname</var></code> is the name of a CSS class. It can be chosen +arbitrarily and customized through the CSS file. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>html_ostream_end_span</b><i> (html_ostream_t <var>stream</var>, const char *<var>classname</var>)</i> +<a name="IDX50"></a> +</dt> +<dd><p>Ends a <code><span class="<var>classname</var>"></code> element. +</p> +<p>The <code>html_ostream_begin_span</code> / <code>html_ostream_end_span</code> calls +must match properly. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> const char * <b>html_ostream_get_hyperlink_ref</b><i> (html_ostream_t <var>stream</var>)</i> +<a name="IDX51"></a> +</dt> +<dd><p>Returns the referred URL of the currently set hyperlink, or <code>NULL</code> +if no hyperlink attribute is currently set. +</p> +<p>Note: The returned string is only valid up to the next invocation of +<code>html_ostream_set_hyperlink_ref</code>. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>html_ostream_set_hyperlink_ref</b><i> (html_ostream_t <var>stream</var>, const char *<var>ref</var>)</i> +<a name="IDX52"></a> +</dt> +<dd><p>Sets or removes a hyperlink attribute. +</p> +<p>To set a hyperlink attribute, pass a non-<code>NULL</code> <var>ref</var>. +<var>ref</var> is an URL; it should be at most 2083 bytes long. Non-ASCII +characters should be URI-escaped (using the %nn syntax). +</p> +<p>To remove a hyperlink attribute, pass <code>NULL</code> for <var>ref</var>. +</p> +<p>Hyperlinks don't nest. That is, a hyperlink attribute is enabled only +up to the next invocation of <code>html_ostream_set_hyperlink_ref</code>. +</p></dd></dl> + +<dl> +<dt><u>Function:</u> void <b>html_ostream_flush_to_current_style</b><i> (html_ostream_t <var>stream</var>)</i> +<a name="IDX53"></a> +</dt> +<dd><p>This function acts like <code>ostream_flush (<var>stream</var>, FLUSH_THIS_STREAM)</code>, +except that it leaves the destination with the current text style enabled, +instead of with the default text style. +</p> +<p>After calling this function, you can output strings without newlines(!) to the +underlying stream, and they will be rendered like strings passed to +<code>ostream_write_mem</code>, <code>ostream_write_str</code>, or <code>ostream_printf</code>. +</p></dd></dl> + + +<a name="The-memory_005fostream-class"></a> +<a name="SEC29"></a> +<h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC29">3.5.3.5 The <code>memory_ostream</code> class</a> </h4> + +<p>The <code>memory_ostream</code> class supports output to an in-memory buffer. +Its type is ‘<samp>memory_ostream_t</samp>’. It is a subclass of +‘<samp>ostream_t</samp>’. +</p> +<p>It can be instantiated through this function: +</p> +<dl> +<dt><u>Function:</u> memory_ostream_t <b>memory_ostream_create</b><i> (void)</i> +<a name="IDX54"></a> +</dt> +<dd><p>Creates an output stream that accumulates the output in a memory buffer. +</p></dd></dl> + +<p>The class adds the following method: +</p> +<dl> +<dt><u>Function:</u> void <b>memory_ostream_contents</b><i> (memory_ostream_t <var>stream</var>, const void **<var>bufp</var>, size_t *<var>buflenp</var>)</i> +<a name="IDX55"></a> +</dt> +<dd><p>Returns a pointer to the output accumulated so far and its size. It +stores them in <code>*<var>bufp</var></code> and <code>*<var>buflenp</var></code>, respectively. +</p> +<p>Note: These two return values become invalid when more output is done to +the stream or when the stream is freed. +</p></dd></dl> + + +<a name="The-iconv_005fostream-class"></a> +<a name="SEC30"></a> +<h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC30">3.5.3.6 The <code>iconv_ostream</code> class</a> </h4> + +<p>The <code>iconv_ostream</code> class supports output to any destination. Its +type is ‘<samp>iconv_ostream_t</samp>’. It is a subclass of ‘<samp>ostream_t</samp>’ +that adds no methods. +</p> +<p>It can be instantiated through this function: +</p> +<dl> +<dt><u>Function:</u> iconv_ostream_t <b>iconv_ostream_create</b><i> (const char *<var>from_encoding</var>, const char *<var>to_encoding</var>, ostream_t <var>destination</var>)</i> +<a name="IDX56"></a> +</dt> +<dd><p>Creates an output stream that converts from <code><var>from_encoding</var></code> to +<code><var>to_encoding</var></code>, writing the result to <code><var>destination</var></code>. +</p> +<p>Note: The resulting stream must be closed before <code><var>destination</var></code> +can be closed. +</p></dd></dl> + + +<a name="styled_005fostream-subclasses"></a> +<a name="SEC31"></a> +<h3 class="subsection"> <a href="libtextstyle_toc.html#TOC31">3.5.4 Concrete <code>styled_ostream</code> subclasses</a> </h3> + + + +<a name="The-term_005fstyled_005fostream-class"></a> +<a name="SEC32"></a> +<h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC32">3.5.4.1 The <code>term_styled_ostream</code> class</a> </h4> + +<p>The <code>term_styled_ostream</code> class supports styled output to a file +descriptor that is connected to a terminal emulator or console. Its type +is ‘<samp>term_styled_ostream_t</samp>’. It is a subclass of +‘<samp>styled_ostream_t</samp>’. +</p> +<p>It can be instantiated through this function: +</p> +<dl> +<dt><u>Function:</u> term_styled_ostream_t <b>term_styled_ostream_create</b><i> (int <var>fd</var>, const char *<var>filename</var>, ttyctl_t <var>tty_control</var>, const char *<var>css_filename</var>)</i> +<a name="IDX57"></a> +</dt> +<dd><p>Creates an output stream referring to the file descriptor <code><var>fd</var></code>, +styled with the file <code><var>css_filename</var></code>. +</p> +<p><code><var>filename</var></code> is used only for error messages. +</p> +<p><code><var>tty_control</var></code> specifies the amount of control to take over the +underlying tty. +</p> +<p>Note: The resulting stream must be closed before <code><var>fd</var></code> can be +closed. +</p> +<p>Returns <code>NULL</code> upon failure. +</p></dd></dl> + +<p>The following is a variant of this function. Upon failure, it does not +return <code>NULL</code>; instead, it returns a styled <code>fd_stream</code> on +which the styling operations exist but are no-ops. +</p> +<dl> +<dt><u>Function:</u> styled_ostream_t <b>styled_ostream_create</b><i> (int <var>fd</var>, const char *<var>filename</var>, ttyctl_t <var>tty_control</var>, const char *<var>css_filename</var>)</i> +<a name="IDX58"></a> +</dt> +<dd><p>Creates an output stream referring to the file descriptor <code><var>fd</var></code>, +styled with the file <code><var>css_filename</var></code> if possible. +</p> +<p><code><var>filename</var></code> is used only for error messages. +</p> +<p><code><var>tty_control</var></code> specifies the amount of control to take over the +underlying tty. +</p> +<p>Note: The resulting stream must be closed before <code><var>fd</var></code> can be +closed. +</p></dd></dl> + + +<a name="The-html_005fstyled_005fostream-class"></a> +<a name="SEC33"></a> +<h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC33">3.5.4.2 The <code>html_styled_ostream</code> class</a> </h4> + +<p>The <code>html_styled_ostream</code> class supports styled output to any +destination, in HTML syntax. Its type is ‘<samp>html_styled_ostream_t</samp>’. +It is a subclass of ‘<samp>styled_ostream_t</samp>’. +</p> +<p>It can be instantiated through this function: +</p> +<dl> +<dt><u>Function:</u> html_styled_ostream_t <b>html_styled_ostream_create</b><i> (ostream_t <var>destination</var>, const char *<var>css_filename</var>)</i> +<a name="IDX59"></a> +</dt> +<dd><p>Creates an output stream that takes input in the UTF-8 encoding and +writes it in HTML form on <code><var>destination</var></code>, styled with the file +<code><var>css_filename</var></code>. +</p> +<p>Note: The resulting stream must be closed before <code><var>destination</var></code> +can be closed. +</p></dd></dl> + + +<a name="The-noop_005fstyled_005fostream-class"></a> +<a name="SEC34"></a> +<h4 class="subsubsection"> <a href="libtextstyle_toc.html#TOC34">3.5.4.3 The <code>noop_styled_ostream</code> class</a> </h4> + +<p>The <code>noop_styled_ostream</code> class supports the styled output operations +to any destination. The text is output to the given destination; the +styling operations, however, do nothing. Its type is +‘<samp>noop_styled_ostream_t</samp>’. It is a subclass of ‘<samp>styled_ostream_t</samp>’. +</p> +<p>It can be instantiated through this function: +</p> +<dl> +<dt><u>Function:</u> noop_styled_ostream_t <b>noop_styled_ostream_create</b><i> (ostream_t <var>destination</var>, bool <var>pass_ownership</var>)</i> +<a name="IDX60"></a> +</dt> +<dd><p>Creates an output stream that delegates to <code><var>destination</var></code> and +that supports the styling operations as no-ops. +</p> +<p>If <code><var>pass_ownership</var></code> is <code>true</code>, closing the resulting +stream will automatically close the <code><var>destination</var></code>. +</p> +<p>Note: If <code><var>pass_ownership</var></code> is <code>false</code>, the resulting stream +must be closed before <code><var>destination</var></code> can be closed. +</p></dd></dl> + + +<a name="Accessors"></a> +<a name="SEC35"></a> +<h3 class="subsection"> <a href="libtextstyle_toc.html#TOC35">3.5.5 Accessor functions</a> </h3> + +<p>The various concrete stream classes have methods that allow you to retrieve +the arguments passed to the respective constructor function. +</p> +<p>Note: While these methods allow you to retrieve the underlying destination +stream of various kinds of stream, it is not recommended to operate on both +the stream and its underlying destination stream at the same time. Doing +so can lead to undesired interactions between the two streams. +</p> +<p>The <code>file_ostream</code> class has this accessor method: +</p> +<dl> +<dt><u>Function:</u> FILE * <b>file_ostream_get_stdio_stream</b><i> (file_ostream_t <var>stream</var>)</i> +<a name="IDX61"></a> +</dt> +</dl> + +<p>The <code>fd_ostream</code> class has these accessor methods: +</p> +<dl> +<dt><u>Function:</u> int <b>fd_ostream_get_descriptor</b><i> (fd_ostream_t <var>stream</var>)</i> +<a name="IDX62"></a> +</dt> +</dl> +<dl> +<dt><u>Function:</u> const char * <b>fd_ostream_get_filename</b><i> (fd_ostream_t <var>stream</var>)</i> +<a name="IDX63"></a> +</dt> +</dl> +<dl> +<dt><u>Function:</u> bool <b>fd_ostream_is_buffered</b><i> (fd_ostream_t <var>stream</var>)</i> +<a name="IDX64"></a> +</dt> +</dl> + +<p>The <code>term_ostream</code> class has these accessor methods: +</p> +<dl> +<dt><u>Function:</u> int <b>term_ostream_get_descriptor</b><i> (term_ostream_t <var>stream</var>)</i> +<a name="IDX65"></a> +</dt> +</dl> +<dl> +<dt><u>Function:</u> const char * <b>term_ostream_get_filename</b><i> (term_ostream_t <var>stream</var>)</i> +<a name="IDX66"></a> +</dt> +</dl> +<dl> +<dt><u>Function:</u> ttyctl_t <b>term_ostream_get_tty_control</b><i> (term_ostream_t <var>stream</var>)</i> +<a name="IDX67"></a> +</dt> +</dl> +<dl> +<dt><u>Function:</u> ttyctl_t <b>term_ostream_get_effective_tty_control</b><i> (term_ostream_t <var>stream</var>)</i> +<a name="IDX68"></a> +</dt> +<dd><p>Returns the effective tty control of the stream (not <code>TTYCTL_AUTO</code>). +</p></dd></dl> + +<p>The <code>iconv_ostream</code> class has these accessor methods: +</p> +<dl> +<dt><u>Function:</u> const char * <b>iconv_ostream_get_from_encoding</b><i> (iconv_ostream_t <var>stream</var>)</i> +<a name="IDX69"></a> +</dt> +</dl> +<dl> +<dt><u>Function:</u> const char * <b>iconv_ostream_get_to_encoding</b><i> (iconv_ostream_t <var>stream</var>)</i> +<a name="IDX70"></a> +</dt> +</dl> +<dl> +<dt><u>Function:</u> ostream_t <b>iconv_ostream_get_destination</b><i> (iconv_ostream_t <var>stream</var>)</i> +<a name="IDX71"></a> +</dt> +</dl> + +<p>The <code>html_ostream</code> class has this accessor method: +</p> +<dl> +<dt><u>Function:</u> ostream_t <b>html_ostream_get_destination</b><i> (html_ostream_t <var>stream</var>)</i> +<a name="IDX72"></a> +</dt> +</dl> + +<p>The <code>term_styled_ostream</code> class has these accessor methods: +</p> +<dl> +<dt><u>Function:</u> term_ostream_t <b>term_styled_ostream_get_destination</b><i> (term_styled_ostream_t <var>stream</var>)</i> +<a name="IDX73"></a> +</dt> +</dl> +<dl> +<dt><u>Function:</u> const char * <b>term_styled_ostream_get_css_filename</b><i> (term_styled_ostream_t <var>stream</var>)</i> +<a name="IDX74"></a> +</dt> +</dl> + +<p>The <code>html_styled_ostream</code> class has these accessor methods: +</p> +<dl> +<dt><u>Function:</u> ostream_t <b>html_styled_ostream_get_destination</b><i> (html_styled_ostream_t <var>stream</var>)</i> +<a name="IDX75"></a> +</dt> +</dl> +<dl> +<dt><u>Function:</u> html_ostream_t <b>html_styled_ostream_get_html_destination</b><i> (html_styled_ostream_t <var>stream</var>)</i> +<a name="IDX76"></a> +</dt> +</dl> +<dl> +<dt><u>Function:</u> const char * <b>html_styled_ostream_get_css_filename</b><i> (html_styled_ostream_t <var>stream</var>)</i> +<a name="IDX77"></a> +</dt> +</dl> + +<p>The <code>noop_styled_ostream</code> class has these accessor methods: +</p> +<dl> +<dt><u>Function:</u> ostream_t <b>noop_styled_ostream_get_destination</b><i> (noop_styled_ostream_t <var>stream</var>)</i> +<a name="IDX78"></a> +</dt> +</dl> +<dl> +<dt><u>Function:</u> bool <b>noop_styled_ostream_is_owning_destination</b><i> (noop_styled_ostream_t <var>stream</var>)</i> +<a name="IDX79"></a> +</dt> +</dl> + + +<a name="Debugging-the-styling-code"></a> +<a name="SEC36"></a> +<h2 class="section"> <a href="libtextstyle_toc.html#TOC36">3.6 Debugging the text styling support</a> </h2> + +<p>If you want to understand which output of your program is associated with +which CSS classes, the simplest way is as follows: +</p> +<ol> +<li> +Run the program with the command-line option <code>--color=html</code>, +redirecting the output to a file. +</li><li> +Then inspect this output. Text regions associated with a CSS class are +surrounded by <code><span class="<var>css-class</var>"></code>...<code></span></code>. +</li></ol> + + +<a name="What-to-document"></a> +<a name="SEC37"></a> +<h2 class="section"> <a href="libtextstyle_toc.html#TOC37">3.7 Documenting the text styling support</a> </h2> + +<p>To make the text styling support available to the end user of your +package, the following need to be documented: +</p><ul> +<li> +The command-line options. This typically needs to be done in several +places: in the ‘<samp>--help</samp>’ output, in the <code>man</code> pages (if present), +and in the documentation. +</li><li> +Which programs support ‘<samp>--color=test</samp>’? +</li><li> +The list of CSS classes and their meaning. This is necessary, so that +the user can create their own style file; the CSS classes are part of the +selectors in the CSS rules. +</li><li> +The location of the default style file. This is a convenience, so that +the user, when creating their own style file, can start from the default +one. +</li><li> +The environment variable, called <code><var>style_file_envvar</var></code> above, +that, when set to a non-empty value, specifies the style file to use. +</li></ul> + + +<table cellpadding="1" cellspacing="1" border="0"> +<tr><td valign="middle" align="left">[<a href="#SEC15" title="Beginning of this chapter or previous chapter"> << </a>]</td> +<td valign="middle" align="left">[<a href="libtextstyle_4.html#SEC38" title="Next chapter"> >> </a>]</td> +<td valign="middle" align="left"> </td> +<td valign="middle" align="left"> </td> +<td valign="middle" align="left"> </td> +<td valign="middle" align="left"> </td> +<td valign="middle" align="left"> </td> +<td valign="middle" align="left">[<a href="libtextstyle_toc.html#SEC_Top" title="Cover (top) of document">Top</a>]</td> +<td valign="middle" align="left">[<a href="libtextstyle_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td> +<td valign="middle" align="left">[<a href="libtextstyle_5.html#SEC46" title="Index">Index</a>]</td> +<td valign="middle" align="left">[<a href="libtextstyle_abt.html#SEC_About" title="About (help)"> ? </a>]</td> +</tr></table> +<p> + <font size="-1"> + This document was generated by <em>Bruno Haible</em> on <em>February, 21 2024</em> using <a href="https://www.nongnu.org/texi2html/"><em>texi2html 1.78a</em></a>. + </font> + <br> + +</p> +</body> +</html>