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force use of pandoc version >= 3.1.12.2

Browse Source 
The `bin/pandoc-wrapper.sh` tool will verify that the ssytem
has a recent enough version of `pandoc(1)`.

We explain why we insist on `pandoc(1)`. version >= 3.1.12.2
in comments where the $PANDOC_MIN_VERSION is set.

Added `--wrap=preserve` as a default argument to `pandoc(1)`.
While this change will impact every HTML file generated,
we believe this will improve the ability of someone to look
at the generated HTML and correlate with the original markdown.

Changed `bin/pandoc-wrapper.sh` VERSION from "1.4.2 2024-03-17"
to "1.4.3 2024-03-18".

Performed `make www` to achieve all of the above and to generate
HTML using the new  `--wrap=preserve` `pandoc(1)` mode.
This commit is contained in:
Landon Curt Noll committed 2024-03-18 01:26:39 -07:00
1 parent 9eb7a54e9f
commit b0b212acb1
402 files changed
+37061 -55132
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2012/blakely/index.html
+73 -107
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@@ -129,10 +129,9 @@
<h2 id="author"><a name="author"></a>Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Philip_Blakely">Philip
Blakely</a><br> Location: <a href="../../location.html#GB">GB</a> -
<em>United Kingdom of Great Britain and Northern Ireland</em>
(<em>United Kingdom</em>) <br><br></li>
<li>Name: <a href="../../authors.html#Philip_Blakely">Philip Blakely</a><br>
Location: <a href="../../location.html#GB">GB</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)
<br><br></li>
</ul>
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@@ -145,44 +144,38 @@ Blakely</a><br> Location: <a href="../../location.html#GB">GB</a> -
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<pre><code>STATUS: INABIAF - please **DO NOT** fix</code></pre>
<p>For more detailed information see <a
href="../../bugs.html#2012_blakely">2012 blakely bugs</a>.</p>
<p>For more detailed information see <a href="../../bugs.html#2012_blakely">2012 blakely bugs</a>.</p>
<h2 id="to-use">To use:</h2>
<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./blakely</span> <span class="st">&quot;RPN formula&quot;</span> resolution <span class="op">&gt;</span> output.gif</span></code></pre></div>
<h2 id="try">Try:</h2>
<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span></span></code></pre></div>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Several IOCCC themes (<a
href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN
calculator</a>, animated <a
href="https://en.wikipedia.org/wiki/GIF">GIF</a> generator, <a
href="https://en.wikipedia.org/wiki/Ray_tracing_(graphics)">ray
tracing</a>) in one package! Very impressive!</p>
<p>The checkerboard pattern in the output can be broken. Could you
figure out how?</p>
<p>Several IOCCC themes (<a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN
calculator</a>, animated
<a href="https://en.wikipedia.org/wiki/GIF">GIF</a> generator, <a href="https://en.wikipedia.org/wiki/Ray_tracing_(graphics)">ray
tracing</a>) in one package!
Very impressive!</p>
<p>The checkerboard pattern in the output can be broken. Could you figure out how?</p>
<p>Larger GIF files confuse some image viewers.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="remarks">Remarks</h3>
<p>This program renders a generic <a
href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN</a>
expression in <a
href="https://en.wikipedia.org/wiki/Ray_tracing_(graphics)">ray-traced</a>
animated <a href="https://en.wikipedia.org/wiki/GIF">GIF</a> form. The
expression in spatial variables <code>x</code> and <code>y</code> is
specified on the command-line with the required resolution, and an
animated GIF showing a fly-around of the resulting surface is output to
<code>stdout</code>.</p>
<p>This program renders a generic
<a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN</a> expression in
<a href="https://en.wikipedia.org/wiki/Ray_tracing_(graphics)">ray-traced</a> animated
<a href="https://en.wikipedia.org/wiki/GIF">GIF</a> form. The expression in spatial
variables <code>x</code> and <code>y</code> is specified on the command-line with the required
resolution, and an animated GIF showing a fly-around of the resulting surface is
output to <code>stdout</code>.</p>
<h3 id="usage">Usage</h3>
<p>The program should be run as:</p>
<div class="sourceCode" id="cb5"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./blakely</span> xy<span class="pp">*</span> 32 <span class="op">&gt;</span> pic.gif</span></code></pre></div>
<p>where the first parameter is a <a
href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN</a>
expression, and the second is the width of the required <a
href="https://en.wikipedia.org/wiki/GIF">GIF</a>, up to a maximum of
250.</p>
<p>The expressions are written in <a
href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">Reverse
Polish Notation</a> with the following characters recognised:</p>
<p>where the first parameter is a
<a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN</a> expression, and the
second is the width of the required <a href="https://en.wikipedia.org/wiki/GIF">GIF</a>, up
to a maximum of 250.</p>
<p>The expressions are written in <a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">Reverse Polish
Notation</a> with the
following characters recognised:</p>
<pre><code>+, -, *, / - usual arithmetic operations
^ - Exponentiation; valid for constant exponent only
s - sin
@@ -192,111 +185,84 @@ d - duplicate number on stack
t - transpose top two elements on stack
x - x coordinate value
y - y coordinate value</code></pre>
<p>NB: all arithmetic is done in double precision, so <code>23/</code>
is two-thirds, rather than 0.</p>
<p>The surface plotted corresponds to <code>-1 &lt;= x,y &lt;= 1</code>
and for best results, the generated <code>z</code> value should lie
between <code>-1</code> and <code>1</code>.</p>
<p>If there is a division by zero, square-root of a negative number, or
similar operation, then the results are undefined.</p>
<p>NB: all arithmetic is done in double precision, so <code>23/</code> is two-thirds, rather
than 0.</p>
<p>The surface plotted corresponds to <code>-1 &lt;= x,y &lt;= 1</code> and for best results, the
generated <code>z</code> value should lie between <code>-1</code> and <code>1</code>.</p>
<p>If there is a division by zero, square-root of a negative number, or similar
operation, then the results are undefined.</p>
<h3 id="examples">Examples</h3>
<p>For test-runs, use a resolution of 32. For simple expressions, the <a
href="https://en.wikipedia.org/wiki/GIF">GIF</a> generation should take
only a few seconds with a modern processor and full optimization.
Runtime scales as <a
href="https://en.wikipedia.org/wiki/Big_O_notation">O(N^3)</a> with
resolution <code>N</code>, and more complex expressions take longer to
compute. For example, increasing the resolution of
<code>ripple.gif</code> to 250 took ~35 minutes to render on an <a
href="https://en.wikipedia.org/wiki/Intel_Core#Core_i7">i7
<p>For test-runs, use a resolution of 32. For simple expressions, the
<a href="https://en.wikipedia.org/wiki/GIF">GIF</a> generation should take only
a few seconds with a modern processor and full optimization. Runtime scales as
<a href="https://en.wikipedia.org/wiki/Big_O_notation">O(N^3)</a> with resolution <code>N</code>,
and more complex expressions take longer to compute. For example, increasing the
resolution of <code>ripple.gif</code>
to 250 took ~35 minutes to render on an <a href="https://en.wikipedia.org/wiki/Intel_Core#Core_i7">i7
processor</a>.</p>
<div class="sourceCode" id="cb7"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./blakely</span> xy<span class="pp">*</span> 32 <span class="op">&gt;</span> saddle.gif</span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./blakely</span> xx<span class="pp">*</span>yy<span class="pp">*</span>1++d5<span class="pp">*</span>ct/ 64 <span class="op">&gt;</span> ripple.gif</span></code></pre></div>
<h3 id="algorithm">Algorithm</h3>
<p>A generic root-finding algorithm to find the point of intersection
between a ray and the surface is done using a simple forward search from
the eye. In order to make the rendering realistic, both the value of the
expression, and its derivative with respect to <code>x</code> and
<code>y</code> must be tracked. This is done using an obvious
stack-based approach.</p>
<p>A generic root-finding algorithm to find the point of intersection between a ray
and the surface is done using a simple forward search from the eye. In order to
make the rendering realistic, both the value of the expression, and its
derivative with respect to <code>x</code> and <code>y</code> must be tracked. This is done using an
obvious stack-based approach.</p>
<h3 id="obfuscations">Obfuscations</h3>
<p>Much of the obfuscation is achieved through the use of single-letter
variables and <code>#define</code>s. The characters output for the <a
href="https://en.wikipedia.org/wiki/GIF#File_format">GIF format</a> are
generated in myriad and wonderful ways, making use of <a
href="https://en.wikipedia.org/wiki/Exclusive_or">XOR</a>, return values
from <code>putchar()</code>, and odd expressions. The layout is in the
form of <code>X Y Z</code>.</p>
<p>Much of the obfuscation is achieved through the use of single-letter variables
and <code>#define</code>s. The characters output for the <a href="https://en.wikipedia.org/wiki/GIF#File_format">GIF
format</a> are generated in myriad
and wonderful ways, making use of
<a href="https://en.wikipedia.org/wiki/Exclusive_or">XOR</a>, return values from
<code>putchar()</code>, and odd expressions. The layout is in the form of <code>X Y Z</code>.</p>
<h3 id="limitations">Limitations</h3>
<p>ASCII is assumed since many bytes for the <a
href="https://en.wikipedia.org/wiki/GIF">GIF</a> output are generated
from characters given in the source code. On compilation a few warnings
about parentheses come up when using gcc 4.6.3, and one about no return
value from <code>main()</code> (who uses exit codes anyway?), but clang
3.1 emits no warnings.</p>
<p>ASCII is assumed since many bytes for the
<a href="https://en.wikipedia.org/wiki/GIF">GIF</a> output are generated from characters
given in the source code. On compilation a few warnings about parentheses come
up when using gcc 4.6.3, and one about no return value from <code>main()</code> (who uses
exit codes anyway?), but clang 3.1 emits no warnings.</p>
<h3 id="questions">Questions</h3>
<ul>
<li>Apart from their appearance when computing the <a
href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN
expression</a>, <a
href="https://en.wikipedia.org/wiki/Sine_and_cosine">sin and cos</a> are
not used. How do we then get the correct angles for rotation?</li>
<li>Apart from their appearance when computing the <a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation">RPN
expression</a>, <a href="https://en.wikipedia.org/wiki/Sine_and_cosine">sin and
cos</a> are not used.
How do we then get the correct angles for rotation?</li>
<li>Exactly how many times will the animation repeat?</li>
<li>Why is there an upper limit of 250x250 for the resolution?</li>
<li>What is the point of <code>b[0]</code>?</li>
<li>Where are the words <code>NETSCAPE</code> and <code>GIF</code>
hidden in the source?</li>
<li>Where are the words <code>NETSCAPE</code> and <code>GIF</code> hidden in the source?</li>
</ul>
<p>(Note that the author may or may not be able to answer all of the
above questions.)</p>
<h2 id="copyright-and-cc-by-sa-4.0-license">Copyright and CC BY-SA 4.0
License:</h2>
<p>This file is Copyright (c) 2023 by Landon Curt Noll. All Rights
Reserved. You are free to share and adapt this file under the terms of
this license:</p>
<p>(Note that the author may or may not be able to answer all of the above
questions.)</p>
<h2 id="copyright-and-cc-by-sa-4.0-license">Copyright and CC BY-SA 4.0 License:</h2>
<p>This file is Copyright (c) 2023 by Landon Curt Noll. All Rights Reserved.
You are free to share and adapt this file under the terms of this license:</p>
<pre><code>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)</code></pre>
<p>For more information, see:
https://creativecommons.org/licenses/by-sa/4.0/</p>
<p>For more information, see: https://creativecommons.org/licenses/by-sa/4.0/</p>
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<h1 id="inventory-for-2012blakely"><a name="inventory"></a>Inventory for
2012/blakely</h1>
<h1 id="inventory-for-2012blakely"><a name="inventory"></a>Inventory for 2012/blakely</h1>
<p><a href="#top">Jump to top</a></p>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/blakely.c">blakely.c</a>
- entry source</li>
<li><a
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/Makefile">Makefile</a>
- entry Makefile</li>
<li><a
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/blakely.orig.c">blakely.orig.c</a>
- original source</li>
<li><a
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/try.sh">try.sh</a>
- how to run</li>
<li><a href="2012_blakely.tar.bz2">2012_blakely.tar.bz2</a> - download
entry source</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/blakely.c">blakely.c</a> - entry source</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/blakely.orig.c">blakely.orig.c</a> - original source</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/try.sh">try.sh</a> - how to run</li>
<li><a href="2012_blakely.tar.bz2">2012_blakely.tar.bz2</a> - download entry source</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="index.html">index.html</a> - entry home page</li>
<li><a
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/.entry.json">.entry.json</a>
- description of entry in JSON</li>
<li><a
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/.gitignore">.gitignore</a>
- list of files that should not be committed under git</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/.entry.json">.entry.json</a> - description of entry in JSON</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href=".path">.path</a> - directory path from top directory</li>
<li><a
href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/README.md">README.md</a>
- markdown source for index.html</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2012/blakely/README.md">README.md</a> - markdown source for index.html</li>
</ul>
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