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<a href='https://github.com/akkartik/mu/blob/main/baremetal/ex7.mu'>https://github.com/akkartik/mu/blob/main/baremetal/ex7.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Cursor-based motions.</span>
<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="muComment"># To build a disk image:</span>
<span id="L4" class="LineNr"> 4 </span><span class="muComment"># ./translate_mu_baremetal baremetal/ex7.mu # emits disk.img</span>
<span id="L5" class="LineNr"> 5 </span><span class="muComment"># To run:</span>
<span id="L6" class="LineNr"> 6 </span><span class="muComment"># qemu-system-i386 disk.img</span>
<span id="L7" class="LineNr"> 7 </span><span class="muComment"># Or:</span>
<span id="L8" class="LineNr"> 8 </span><span class="muComment"># bochs -f baremetal/boot.bochsrc # boot.bochsrc loads disk.img</span>
<span id="L9" class="LineNr"> 9 </span><span class="muComment">#</span>
<span id="L10" class="LineNr">10 </span><span class="muComment"># Expected output: an interactive game a bit like "snakes". Try pressing h, j,</span>
<span id="L11" class="LineNr">11 </span><span class="muComment"># k, l.</span>
<span id="L12" class="LineNr">12 </span>
<span id="L13" class="LineNr">13 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='ex7.mu.html#L13'>main</a></span> <span class="Delimiter">{</span>
<span id="L14" class="LineNr">14 </span> <span class="PreProc">var</span> space/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> copy <span class="Constant">0x20</span>
<span id="L15" class="LineNr">15 </span> <a href='500text-screen.mu.html#L115'>set-cursor-position</a> <span class="Constant">0</span>, <span class="Constant">0</span>, <span class="Constant">0</span>
<span id="L16" class="LineNr">16 </span> <span class="Delimiter">{</span>
<span id="L17" class="LineNr">17 </span> <a href='500text-screen.mu.html#L162'>show-cursor</a> <span class="Constant">0</span>, space
<span id="L18" class="LineNr">18 </span> <span class="PreProc">var</span> key/<span class="Constant">eax</span>: byte <span class="SpecialChar"><-</span> <a href='102keyboard.subx.html#L9'>read-key</a> <span class="Constant">0</span>
<span id="L19" class="LineNr">19 </span> <span class="Delimiter">{</span>
<span id="L20" class="LineNr">20 </span> compare key, <span class="Constant">0x68</span> <span class="muComment"># 'h'</span>
<span id="L21" class="LineNr">21 </span> <span class="PreProc">break-if-!=</span>
<span id="L22" class="LineNr">22 </span> <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> copy <span class="Constant">0x2d</span> <span class="muComment"># '-'</span>
<span id="L23" class="LineNr">23 </span> <a href='501draw-text.mu.html#L63'>draw-grapheme-at-cursor</a> <span class="Constant">0</span>, g, <span class="Constant">0x31</span>
<span id="L24" class="LineNr">24 </span> <a href='501draw-text.mu.html#L3'>cursor-left</a> <span class="Constant">0</span>
<span id="L25" class="LineNr">25 </span> <span class="Delimiter">}</span>
<span id="L26" class="LineNr">26 </span> <span class="Delimiter">{</span>
<span id="L27" class="LineNr">27 </span> compare key, <span class="Constant">0x6a</span> <span class="muComment"># 'j'</span>
<span id="L28" class="LineNr">28 </span> <span class="PreProc">break-if-!=</span>
<span id="L29" class="LineNr">29 </span> <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> copy <span class="Constant">0x7c</span> <span class="muComment"># '|'</span>
<span id="L30" class="LineNr">30 </span> <a href='501draw-text.mu.html#L63'>draw-grapheme-at-cursor</a> <span class="Constant">0</span>, g, <span class="Constant">0x31</span>
<span id="L31" class="LineNr">31 </span> <a href='501draw-text.mu.html#L46'>cursor-down</a> <span class="Constant">0</span>
<span id="L32" class="LineNr">32 </span> <span class="Delimiter">}</span>
<span id="L33" class="LineNr">33 </span> <span class="Delimiter">{</span>
<span id="L34" class="LineNr">34 </span> compare key, <span class="Constant">0x6b</span> <span class="muComment"># 'k'</span>
<span id="L35" class="LineNr">35 </span> <span class="PreProc">break-if-!=</span>
<span id="L36" class="LineNr">36 </span> <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> copy <span class="Constant">0x7c</span> <span class="muComment"># '|'</span>
<span id="L37" class="LineNr">37 </span> <a href='501draw-text.mu.html#L63'>draw-grapheme-at-cursor</a> <span class="Constant">0</span>, g, <span class="Constant">0x31</span>
<span id="L38" class="LineNr">38 </span> <a href='501draw-text.mu.html#L33'>cursor-up</a> <span class="Constant">0</span>
<span id="L39" class="LineNr">39 </span> <span class="Delimiter">}</span>
<span id="L40" class="LineNr">40 </span> <span class="Delimiter">{</span>
<span id="L41" class="LineNr">41 </span> compare key, <span class="Constant">0x6c</span> <span class="muComment"># 'l'</span>
<span id="L42" class="LineNr">42 </span> <span class="PreProc">break-if-!=</span>
<span id="L43" class="LineNr">43 </span> <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar"><-</span> copy <span class="Constant">0x2d</span> <span class="muComment"># '-'</span>
<span id="L44" class="LineNr">44 </span> <a href='501draw-text.mu.html#L63'>draw-grapheme-at-cursor</a> <span class="Constant">0</span>, g, <span class="Constant">0x31</span>
<span id="L45" class="LineNr">45 </span> <a href='501draw-text.mu.html#L16'>cursor-right</a> <span class="Constant">0</span>
<span id="L46" class="LineNr">46 </span> <span class="Delimiter">}</span>
<span id="L47" class="LineNr">47 </span> <span class="PreProc">loop</span>
<span id="L48" class="LineNr">48 </span> <span class="Delimiter">}</span>
<span id="L49" class="LineNr">49 </span><span class="Delimiter">}</span>
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