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27<h1>Lua-System</h1>
28
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30<ul>
31 <li><a href="../index.html">Index</a></li>
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33
34
35
36<h2>Examples</h2>
37<ul class="nowrap">
38 <li><a href="../examples/compat.lua.html">compat.lua</a></li>
39 <li><a href="../examples/flag_debugging.lua.html">flag_debugging.lua</a></li>
40 <li><a href="../examples/password_input.lua.html">password_input.lua</a></li>
41 <li><a href="../examples/read.lua.html">read.lua</a></li>
42 <li><a href="../examples/readline.lua.html">readline.lua</a></li>
43 <li><strong>spinner.lua</strong></li>
44 <li><a href="../examples/spiral_snake.lua.html">spiral_snake.lua</a></li>
45 <li><a href="../examples/terminalsize.lua.html">terminalsize.lua</a></li>
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47<h2>Modules</h2>
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50</ul>
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55<h2>Topics</h2>
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59 <li><a href="../topics/03-terminal.md.html">3. Terminal functionality</a></li>
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61 <li><a href="../topics/LICENSE.md.html">MIT License</a></li>
62</ul>
63
64</div>
65
66<div id="content">
67
68 <h2>spinner.lua</h2>
69<pre>
70<span class="keyword">local</span> sys = <span class="global">require</span>(<span class="string">"system"</span>)
71
72<span class="global">print</span> <span class="string">[[
73
74An example to display a spinner, whilst a long running task executes.
75
76]]</span>
77
78
79<span class="comment">-- start make backup, to auto-restore on exit
80</span>sys.<span class="function-name">autotermrestore</span>()
81<span class="comment">-- configure console
82</span>sys.<span class="function-name">setconsoleflags</span>(<span class="global">io</span>.stdin, sys.<span class="function-name">getconsoleflags</span>(<span class="global">io</span>.stdin) - sys.CIF_ECHO_INPUT - sys.CIF_LINE_INPUT)
83<span class="keyword">local</span> of = sys.<span class="function-name">tcgetattr</span>(<span class="global">io</span>.stdin)
84sys.<span class="function-name">tcsetattr</span>(<span class="global">io</span>.stdin, sys.TCSANOW, { lflag = of.lflag - sys.L_ICANON - sys.L_ECHO })
85sys.<span class="function-name">setnonblock</span>(<span class="global">io</span>.stdin, <span class="keyword">true</span>)
86
87
88
89<span class="keyword">local</span> <span class="keyword">function</span> <span class="function-name">hideCursor</span>()
90 <span class="global">io</span>.<span class="function-name">write</span>(<span class="string">"\27[?25l"</span>)
91 <span class="global">io</span>.<span class="function-name">flush</span>()
92<span class="keyword">end</span>
93
94<span class="keyword">local</span> <span class="keyword">function</span> <span class="function-name">showCursor</span>()
95 <span class="global">io</span>.<span class="function-name">write</span>(<span class="string">"\27[?25h"</span>)
96 <span class="global">io</span>.<span class="function-name">flush</span>()
97<span class="keyword">end</span>
98
99<span class="keyword">local</span> <span class="keyword">function</span> <span class="function-name">left</span>(n)
100 <span class="global">io</span>.<span class="function-name">write</span>(<span class="string">"\27["</span>,n <span class="keyword">or</span> <span class="number">1</span>,<span class="string">"D"</span>)
101 <span class="global">io</span>.<span class="function-name">flush</span>()
102<span class="keyword">end</span>
103
104
105
106<span class="keyword">local</span> spinner <span class="keyword">do</span>
107 <span class="keyword">local</span> spin = <span class="string">[[|/-\]]</span>
108 <span class="keyword">local</span> i = <span class="number">1</span>
109 spinner = <span class="keyword">function</span>()
110 <span class="function-name">hideCursor</span>()
111 <span class="global">io</span>.<span class="function-name">write</span>(spin:<span class="function-name">sub</span>(i, i))
112 <span class="function-name">left</span>()
113 i = i + <span class="number">1</span>
114 <span class="keyword">if</span> i &gt; #spin <span class="keyword">then</span> i = <span class="number">1</span> <span class="keyword">end</span>
115
116 <span class="keyword">if</span> sys.<span class="function-name">readkey</span>(<span class="number">0</span>) ~= <span class="keyword">nil</span> <span class="keyword">then</span>
117 <span class="keyword">while</span> sys.<span class="function-name">readkey</span>(<span class="number">0</span>) ~= <span class="keyword">nil</span> <span class="keyword">do</span> <span class="keyword">end</span> <span class="comment">-- consume keys pressed
118</span> <span class="global">io</span>.<span class="function-name">write</span>(<span class="string">" "</span>);
119 <span class="function-name">left</span>()
120 <span class="function-name">showCursor</span>()
121 <span class="keyword">return</span> <span class="keyword">true</span>
122 <span class="keyword">else</span>
123 <span class="keyword">return</span> <span class="keyword">false</span>
124 <span class="keyword">end</span>
125 <span class="keyword">end</span>
126<span class="keyword">end</span>
127
128<span class="global">io</span>.stdout:<span class="function-name">write</span>(<span class="string">"press any key to stop the spinner... "</span>)
129<span class="keyword">while</span> <span class="keyword">not</span> <span class="function-name">spinner</span>() <span class="keyword">do</span>
130 sys.<span class="function-name">sleep</span>(<span class="number">0.1</span>)
131<span class="keyword">end</span>
132
133<span class="global">print</span>(<span class="string">"Done!"</span>)</pre>
134
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