arc/charterm/test-charterm.rkt


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#lang racket/base
;; For legal info, see file "charterm.rkt".

;; (require (planet neil/charterm:1))
(require "charterm.rkt")

(with-charterm
 (charterm-clear-screen)
 (charterm-cursor 10 5)
 (charterm-display "Hello, ")
 (charterm-bold)
 (charterm-display "you")
 (charterm-normal)
 (charterm-display ".")
 (charterm-cursor 1 1)
 (charterm-display "Press a key...")
 (let ((key (charterm-read-key)))
   (charterm-cursor 1 1)
   (charterm-clear-line)
   (printf "You pressed: ~S\r\n" key)))
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<pre id='vimCodeElement'>
<span class="Comment"># example program: maintain multiple counters with isolated lexical scopes</span>
<span class="Comment"># (spaces)</span>

<span class="muRecipe">recipe</span> new-counter n:number<span class="muRecipe"> -&gt; </span><span class="Constant">default-space</span>:address:shared:array:location [
  <span class="Constant">default-space</span><span class="Special"> &lt;- </span>new <span class="Constant">location:type</span>, <span class="Constant">30</span>
  <span class="Constant">load-ingredients</span>
]

<span class="muRecipe">recipe</span> increment-counter outer:address:shared:array:location/names:new-counter, x:number<span class="muRecipe"> -&gt; </span>n:number/space:<span class="Constant">1</span> [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Constant">0</span>:address:shared:array:location/names:new-counter<span class="Special"> &lt;- </span>copy outer  <span class="Comment"># setup outer space; it *must* come from 'new-counter'</span>
  n/space:<span class="Constant">1</span><span class="Special"> &lt;- </span>add n/space:<span class="Constant">1</span>, x
]

<span class="muRecipe">recipe</span> main [
  <span class="Constant">local-scope</span>
  <span class="Comment"># counter A</span>
  a:address:shared:array:location<span class="Special"> &lt;- </span>new-counter <span class="Constant">34</span>
  <span class="Comment"># counter B</span>
  b:address:shared:array:location<span class="Special"> &lt;- </span>new-counter <span class="Constant">23</span>
  <span class="Comment"># increment both by 2 but in different ways</span>
  increment-counter a, <span class="Constant">1</span>
  b-value:number<span class="Special"> &lt;- </span>increment-counter b, <span class="Constant">2</span>
  a-value:number<span class="Special"> &lt;- </span>increment-counter a, <span class="Constant">1</span>
  <span class="Comment"># check results</span>
  $print <span class="Constant">[Contents of counters</span>
<span class="Constant">]</span>
  <span class="Comment"># trailing space in next line is to help with syntax highlighting</span>
  $print <span class="Constant">[a: ]</span>, a-value, <span class="Constant">[ b: ]</span>, b-value, <span class="Constant">[ </span>
<span class="Constant">]</span>
]
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