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<h1>Bugs in asciidoc latex backend</h1>
<span id="author">Geoff Eddy</span><br />
<span id="revision">version 9.0.4,</span>
20 October 2020
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>Benjamin Klum was unable to maintain the LaTeX backend beyond version
8.2.7, and as a consequence the <code>latex.conf</code> file ceased to work with
<code>asciidoc</code> sometime after this. For version 8.4.3 I made some changes
to the file to get it working again. This document summarises the
remaining issues which I have found with generating LaTeX and thence
PDF output with <code>asciidoc</code>, which is done as follows:</p></div>
<div class="ulist"><ul>
<li>
<p>
<code>asciidoc --backend=latex --unsafe FILE.txt</code>
</p>
</li>
<li>
<p>
<code>latex FILE.tex</code>
</p>
</li>
<li>
<p>
<code>kpdf FILE.pdf</code>
</p>
</li>
</ul></div>
<div class="paragraph"><p>Many of these were found by processing the <code>asciidoc.txt</code> file and
comparing the HTML output with the PDF.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_footnotes">Footnotes</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
Priority
</dt>
<dd>
<p>
Low.
</p>
</dd>
<dt class="hdlist1">
Problem
</dt>
<dd>
<p>
References to footnotes, and a sensible value for the
<code>[footnoteref-inlinemacro]</code> section, don’t seem to be possible.
</p>
</dd>
<dt class="hdlist1">
Cause
</dt>
<dd>
<p>
LaTeX doesn’t support footnoting much beyond creating a
footnote at a certain point in text and displaying the footnote
itself.
</p>
</dd>
<dt class="hdlist1">
Solution
</dt>
<dd>
<p>
Unclear. How important or necessary is this, anyway?
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_spurious_text_at_starts_of_paragraphs">Spurious text at starts of paragraphs</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
Priority
</dt>
<dd>
<p>
Medium
</p>
</dd>
<dt class="hdlist1">
Problem
</dt>
<dd>
<p>
It is necessary to insert spurious text in paragraphs.
</p>
</dd>
<dt class="hdlist1">
Cause
</dt>
<dd>
<p>
This <code>asciidoc</code> input:
</p>
<div class="literalblock">
<div class="content">
<pre><code>-------------------------------------------------------------------
Text
-------------------------------------------------------------------</code></pre>
</div></div>
<div class="paragraph"><p>generates this LaTeX code:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>\begin{lstlisting}
SPURIOUS TEXTText\end{lstlisting}</code></pre>
</div></div>
<div class="paragraph"><p>which should be:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>\begin{lstlisting}[]
Text\end{lstlisting}</code></pre>
</div></div>
</dd>
<dt class="hdlist1">
Solution
</dt>
<dd>
<p>
Find out a way to generate the correct LaTeX output as
above. The obvious solution, as explained in <code>latet.conf</code>, doesn’t
work.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_tables">Tables</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
Priority
</dt>
<dd>
<p>
Rather high.
</p>
</dd>
<dt class="hdlist1">
Problem
</dt>
<dd>
<p>
Not all of the table configuration options can be passed
through to the LaTeX backend. In particular, I’ve had to assume that
all tables will be fifteen or fewer left-justified columns wide.
</p>
</dd>
<dt class="hdlist1">
Cause
</dt>
<dd>
<p>
The table models in LaTeX and HTML are too dissimilar for one
<code>asciidoc</code> specification to generate valid output in both formats by
simple regexp replacement. Related to this is the unfortunate fact
that <code><COLGROUP></code> and related tags aren’t a required part of HTML4,
and some broswers (at least Firefox and Konqueror) don’t implement
them.
</p>
</dd>
<dt class="hdlist1">
Solution
</dt>
<dd>
<p>
Perhaps table processing could be handled by a Python
plugin, which would read in a table spec and generate the appropriate
text?
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_unicode_escaping">Unicode escaping</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
Priority
</dt>
<dd>
<p>
Rather high, to me at least.
</p>
</dd>
<dt class="hdlist1">
Problem
</dt>
<dd>
<p>
The commented-out section in <code>latex.conf</code>, if uncommented,
converts <code>&#960;</code> to <code>\unichar{960}</code>, which then causes LaTeX to
complain that the resulting command is unavailable in encoding T1. The
more common non-ASCII characters, such as those in <code>félicité</code> and
<code>świeca</code>, are handled properly, but some - such as the IPA characters
in the <code>tipa</code> package - are not.
</p>
</dd>
<dt class="hdlist1">
Cause
</dt>
<dd>
<p>
The encodings in the LaTeX output are wrong.
</p>
</dd>
<dt class="hdlist1">
Solution
</dt>
<dd>
<p>
Correct the encodings.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_text_colours">Text colours</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
Priority
</dt>
<dd>
<p>
Probably low
</p>
</dd>
<dt class="hdlist1">
Problem
</dt>
<dd>
<p>
The text colour options are not processed by LaTeX; for
example <code>[#ff0000]#Red text#</code> is not rendered in red.
</p>
</dd>
<dt class="hdlist1">
Cause
</dt>
<dd>
<p>
LaTeX and HTML represent RGB triads differently: HTML is happy
with <code>#ff8000</code>, but LaTeX needs <code>[rgb]{1,0.5,0}</code>.
</p>
</dd>
<dt class="hdlist1">
Solution
</dt>
<dd>
<p>
Provide some sort of internal RGB conversion mechanism
which can convert RGB triads to different representations.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_text_sizes">Text sizes</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
Priority
</dt>
<dd>
<p>
Probably low
</p>
</dd>
<dt class="hdlist1">
Problem
</dt>
<dd>
<p>
The text size options are not processed by LaTeX:
<code>[,,1]#text#</code> is rendered in the same size as normal text.
</p>
</dd>
<dt class="hdlist1">
Cause
</dt>
<dd>
<p>
HTML size tags - <code>h1</code> through <code>h7</code> - are directly derivable
from the size number, whereas LaTeX has a series of descriptive words
(<code>HUGE</code> through <code>normalsize</code> to <code>scriptsize</code>).
</p>
</dd>
<dt class="hdlist1">
Solution
</dt>
<dd>
<p>
Provide a way to treat the number as an index into an
array.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_background_colour_in_paragraphs">Background colour in paragraphs</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
Priority
</dt>
<dd>
<p>
Medium
</p>
</dd>
<dt class="hdlist1">
Problem
</dt>
<dd>
<p>
If the <code>backgroundcolor</code> attribute is specified in the
<code>lstset</code> command, all paragraphs are displayed as black rectangles by
<code>kpdf</code>, <code>xpdf</code>, and <code>evince</code>, although <code>kdvi</code> has no problems. I’ve
had to remove the attribute, and so paragraphs all appear on white
backgrounds. The PDF viewers also complain:
</p>
<div class="literalblock">
<div class="content">
<pre><code>Error (NNNN): Unknown operator 'rgb'</code></pre>
</div></div>
</dd>
<dt class="hdlist1">
Cause
</dt>
<dd>
<p>
Apparently a known bug in the output of <code>pdflatex</code>. Not a bug
in <code>asciidoc</code>.
</p>
</dd>
<dt class="hdlist1">
Solution
</dt>
<dd>
<p>
Wait until this bug is fixed?
</p>
</dd>
</dl></div>
</div>
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