html/516read-line.mu.html

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  57 <a href='https://github.com/akkartik/mu/blob/main/516read-line.mu'>https://github.com/akkartik/mu/blob/main/516read-line.mu</a>
  58 <pre id='vimCodeElement'>
  59 <span id="L1" class="LineNr"> 1 </span><span class="muComment"># read line from keyboard into stream while also echoing to screen</span>
  60 <span id="L2" class="LineNr"> 2 </span><span class="muComment"># abort on stream overflow</span>
  61 <span id="L3" class="LineNr"> 3 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='516read-line.mu.html#L3'>read-line-from-keyboard</a></span> keyboard: (addr keyboard), out: (addr stream byte), <a href='500fake-screen.mu.html#L16'>screen</a>: (addr <a href='500fake-screen.mu.html#L16'>screen</a>), fg: int, bg: int <span class="Delimiter">{</span>
  62 <span id="L4" class="LineNr"> 4 </span>  <a href='106stream.subx.html#L20'>clear-stream</a> out
  63 <span id="L5" class="LineNr"> 5 </span>  $read-line-from-keyboard:<span class="PreProc">loop</span>: <span class="Delimiter">{</span>
  64 <span id="L6" class="LineNr"> 6 </span>    <a href='500fake-screen.mu.html#L316'>draw-cursor</a> <a href='500fake-screen.mu.html#L16'>screen</a>, <span class="Constant">0x20</span>/space
  65 <span id="L7" class="LineNr"> 7 </span>    <span class="PreProc">var</span> key/eax: byte <span class="Special">&lt;-</span> <a href='102keyboard.subx.html#L21'>read-key</a> keyboard
  66 <span id="L8" class="LineNr"> 8 </span>    compare key, <span class="Constant">0xa</span>/newline
  67 <span id="L9" class="LineNr"> 9 </span>    <span class="PreProc">break-if-=</span>
  68 <span id="L10" class="LineNr">10 </span>    compare key, <span class="Constant">0</span>
  69 <span id="L11" class="LineNr">11 </span>    <span class="PreProc">loop-if-=</span>
  70 <span id="L12" class="LineNr">12 </span>    compare key, <span class="Constant">8</span>/backspace
  71 <span id="L13" class="LineNr">13 </span>    <span class="Delimiter">{</span>
  72 <span id="L14" class="LineNr">14 </span>      <span class="PreProc">break-if-!=</span>
  73 <span id="L15" class="LineNr">15 </span>      <a href='115write-byte.subx.html#L79'>undo-append-byte</a> out
  74 <span id="L16" class="LineNr">16 </span>      <a href='501draw-text.mu.html#L84'>draw-code-point-at-cursor-over-full-screen</a> <a href='500fake-screen.mu.html#L16'>screen</a>, <span class="Constant">0x20</span>/space, fg <span class="Constant">0</span>/bg  <span class="muComment"># clear cursor</span>
  75 <span id="L17" class="LineNr">17 </span>      <a href='501draw-text.mu.html#L3'>move-cursor-left</a> <a href='500fake-screen.mu.html#L16'>screen</a>
  76 <span id="L18" class="LineNr">18 </span>      <a href='501draw-text.mu.html#L3'>move-cursor-left</a> <a href='500fake-screen.mu.html#L16'>screen</a>
  77 <span id="L19" class="LineNr">19 </span>      <a href='501draw-text.mu.html#L84'>draw-code-point-at-cursor-over-full-screen</a> <a href='500fake-screen.mu.html#L16'>screen</a>, <span class="Constant">0x20</span>/space, fg <span class="Constant">0</span>/bg  <span class="muComment"># clear old cursor</span>
  78 <span id="L20" class="LineNr">20 </span>      <a href='501draw-text.mu.html#L3'>move-cursor-left</a> <a href='500fake-screen.mu.html#L16'>screen</a>
  79 <span id="L21" class="LineNr">21 </span>      <span class="PreProc">loop</span> $read-line-from-keyboard:<span class="PreProc">loop</span>
  80 <span id="L22" class="LineNr">22 </span>    <span class="Delimiter">}</span>
  81 <span id="L23" class="LineNr">23 </span>    <span class="PreProc">var</span> key2/eax: int <span class="Special">&lt;-</span> copy key
  82 <span id="L24" class="LineNr">24 </span>    <a href='115write-byte.subx.html#L12'>append-byte</a> out, key2
  83 <span id="L25" class="LineNr">25 </span>    <span class="PreProc">var</span> c/eax: code-point <span class="Special">&lt;-</span> copy key2
  84 <span id="L26" class="LineNr">26 </span>    <a href='501draw-text.mu.html#L84'>draw-code-point-at-cursor-over-full-screen</a> <a href='500fake-screen.mu.html#L16'>screen</a>, c, fg bg
  85 <span id="L27" class="LineNr">27 </span>    <span class="PreProc">loop</span>
  86 <span id="L28" class="LineNr">28 </span>  <span class="Delimiter">}</span>
  87 <span id="L29" class="LineNr">29 </span>  <span class="muComment"># clear cursor</span>
  88 <span id="L30" class="LineNr">30 </span>  <a href='501draw-text.mu.html#L84'>draw-code-point-at-cursor-over-full-screen</a> <a href='500fake-screen.mu.html#L16'>screen</a>, <span class="Constant">0x20</span>/space, fg bg
  89 <span id="L31" class="LineNr">31 </span><span class="Delimiter">}</span>
  90 </pre>
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