Fix the search engine post.

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-<p>The Matrix digital rain implemented in raw C using ANSI escape sequences with
-zero dependencies—not even ncurses.</p>
-
-<video style="max-width:100%;" controls="" poster="poster.png">
-  <source src="matrix.mp4" type="video/mp4" />
-</video>
-
-<p>This project began over three years ago as a fork of Domsson’s unique rendition
-of the Matrix rain: <a href="https://github.com/domsson/fakesteak" class="external" target="_blank" rel="noopener noreferrer">Fakesteak</a>.  I
-aimed to modify the algorithm to produce a rain that resembled the original
-with high visual fidelity.</p>
-
-<h2 id="unicode-support">Unicode support</h2>
-
-<p>Unicode support in the 2022 version lacked flexibility. The charset used in the
-rain had to be a single contiguous block defined by <code class="language-plaintext highlighter-rouge">UNICODE_MIN</code> and
-<code class="language-plaintext highlighter-rouge">UNICODE_MAX</code> settings:</p>
-
-<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>#define UNICODE_MIN 0x0021
-#define UNICODE_MAX 0x007E
-
-static inline void insert_code(matrix *mat,
-    size_t row, size_t col) 
-{
-    mat-&gt;code[index(mat, row, col)] = rand()
-        % (UNICODE_MAX - UNICODE_MIN)
-        + UNICODE_MIN;
-}
-</code></pre></div></div>
-
-<p>There was no way, for instance, to use both ASCII and Katakana at the same
-time. The user had to pick one. In the new version, the user can use any number
-of Unicode blocks using <code class="language-plaintext highlighter-rouge">glyphs</code> array. In fact, the default rain now includes
-both ASCII and half-width Katakana characters:</p>
-
-<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>#define UNICODE(min, max)  (((uint64_t)max &lt;&lt; 32) | min)
-
-static uint64_t glyphs[] = {
-    UNICODE(0x0021, 0x007E), /* ASCII */
-    UNICODE(0xFF65, 0xFF9F), /* Half-width Katakana */
-};
-
-static uint8_t glyphlen = (sizeof glyphs) / (sizeof glyphs[0]);
-
-static inline void insert_code(matrix *mat,
-    size_t row, size_t col) 
-{
-    uint64_t block;
-    uint32_t unicode_min, unicode_max;
-
-    block = glyphs[(rand() % glyphlen)];
-    unicode_min = (uint32_t)block;
-    unicode_max = (uint32_t)(block &gt;&gt; 32);
-
-    mat-&gt;code[index(mat, row, col)] = rand()
-        % (unicode_max - unicode_min)
-        + unicode_min;
-}
-</code></pre></div></div>
-
-<p>Entries in the <code class="language-plaintext highlighter-rouge">glyphs</code> array are Unicode blocks bit-packed in an 8-byte
-container: the four low bytes forms the first codepoint and the four high bytes
-the last.</p>
-
-<h2 id="phosphor-decay">Phosphor decay</h2>
-
-<p>The dim afterglow of monochrome CRT displays is achieved by carefully scaling
-the RGB channels individually and mixing them:</p>
-
-<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>#define DECAY_MPLIER  2
-
-static inline void blend(matrix *mat,
-    size_t row, size_t col)
-{
-    unsigned char *color;
-
-    color = mat-&gt;rgb[index(mat, row, col)].color;
-    color[R] = color[R] - (color[R] - RGB_BG_RED) / DECAY_MPLIER;
-    color[G] = color[G] - (color[G] - RGB_BG_GRN) / DECAY_MPLIER;
-    color[B] = color[B] - (color[B] - RGB_BG_BLU) / DECAY_MPLIER;
-}
-</code></pre></div></div>
-
-<p>The blending function emulates the phosphor decay by gradually transitioning
-each raindrop’s color towards the background color. The multiplier is the
-number of passes over the rain track needed before the afterglow disappears.</p>
-
-<p>Nonetheless, the rain resembles the original with high visual fidelity. It’s
-highly customizable and gentle on the CPU. On my 14” ThinkPad T490, which has a
-resolution of 1920x1080 and 4GHz CPU, it uses 2-3% of the CPU with occasional
-jumps of up to about 8%. Not too bad for a weekend project. The program has
-been tested with xterm and urxvt terminal emulators on OpenBSD and Arch Linux
-systems. Someone has managed to get it moving on a Raspberry Pi as well.</p>
-
-<p>Lastly, to compile and run:</p>
-
-<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>$ cc -O3 main.c -o matrix
-$ ./matrix
-</code></pre></div></div>
-
-<p>“All I see is blonde, brunette, red head.”</p>
-
-<p>Files: <a href="source.tar.gz">source.tar.gz</a></p>