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<h1>Lua-System</h1>
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<h2>Examples</h2>
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<li><a href="../examples/compat.lua.html">compat.lua</a></li>
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<li><strong>read.lua</strong></li>
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<h2>read.lua</h2>
<pre>
<span class="keyword">local</span> sys = <span class="global">require</span> <span class="string">"system"</span>
<span class="global">print</span> <span class="string">[[
This example shows how to do a non-blocking read from the cli.
]]</span>
<span class="comment">-- setup Windows console to handle ANSI processing
</span><span class="keyword">local</span> of_in = sys.<span class="function-name">getconsoleflags</span>(<span class="global">io</span>.stdin)
<span class="keyword">local</span> of_out = sys.<span class="function-name">getconsoleflags</span>(<span class="global">io</span>.stdout)
sys.<span class="function-name">setconsoleflags</span>(<span class="global">io</span>.stdout, sys.<span class="function-name">getconsoleflags</span>(<span class="global">io</span>.stdout) + sys.COF_VIRTUAL_TERMINAL_PROCESSING)
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_VIRTUAL_TERMINAL_INPUT)
<span class="comment">-- setup Posix terminal to use non-blocking mode, and disable line-mode
</span><span class="keyword">local</span> of_attr = sys.<span class="function-name">tcgetattr</span>(<span class="global">io</span>.stdin)
<span class="keyword">local</span> of_block = sys.<span class="function-name">getnonblock</span>(<span class="global">io</span>.stdin)
sys.<span class="function-name">setnonblock</span>(<span class="global">io</span>.stdin, <span class="keyword">true</span>)
sys.<span class="function-name">tcsetattr</span>(<span class="global">io</span>.stdin, sys.TCSANOW, {
lflag = of_attr.lflag - sys.L_ICANON - sys.L_ECHO, <span class="comment">-- disable canonical mode and echo
</span>})
<span class="comment">-- cursor sequences
</span><span class="keyword">local</span> get_cursor_pos = <span class="string">"\27[6n"</span>
<span class="global">print</span>(<span class="string">"Press a key, or 'A' to get cursor position, 'ESC' to exit"</span>)
<span class="keyword">while</span> <span class="keyword">true</span> <span class="keyword">do</span>
<span class="keyword">local</span> key, keytype
<span class="comment">-- wait for a key
</span> <span class="keyword">while</span> <span class="keyword">not</span> key <span class="keyword">do</span>
key, keytype = sys.<span class="function-name">readansi</span>(<span class="global">math</span>.huge)
<span class="keyword">end</span>
<span class="keyword">if</span> key == <span class="string">"A"</span> <span class="keyword">then</span> <span class="global">io</span>.<span class="function-name">write</span>(get_cursor_pos); <span class="global">io</span>.<span class="function-name">flush</span>() <span class="keyword">end</span>
<span class="comment">-- check if we got a key or ANSI sequence
</span> <span class="keyword">if</span> keytype == <span class="string">"char"</span> <span class="keyword">then</span>
<span class="comment">-- just a key
</span> <span class="keyword">local</span> b = key:<span class="function-name">byte</span>()
<span class="keyword">if</span> b < <span class="number">32</span> <span class="keyword">then</span>
key = <span class="string">"."</span> <span class="comment">-- replace control characters with a simple "." to not mess up the screen
</span> <span class="keyword">end</span>
<span class="global">print</span>(<span class="string">"you pressed: "</span> .. key .. <span class="string">" ("</span> .. b .. <span class="string">")"</span>)
<span class="keyword">if</span> b == <span class="number">27</span> <span class="keyword">then</span>
<span class="global">print</span>(<span class="string">"Escape pressed, exiting"</span>)
<span class="keyword">break</span>
<span class="keyword">end</span>
<span class="keyword">elseif</span> keytype == <span class="string">"ansi"</span> <span class="keyword">then</span>
<span class="comment">-- we got an ANSI sequence
</span> <span class="keyword">local</span> seq = { key:<span class="function-name">byte</span>(<span class="number">1</span>, #key) }
<span class="global">print</span>(<span class="string">"ANSI sequence received: "</span> .. key:<span class="function-name">sub</span>(<span class="number">2</span>,-<span class="number">1</span>), <span class="string">"(bytes: "</span> .. <span class="global">table</span>.<span class="function-name">concat</span>(seq, <span class="string">", "</span>)..<span class="string">")"</span>)
<span class="keyword">else</span>
<span class="global">print</span>(<span class="string">"unknown key type received: "</span> .. <span class="global">tostring</span>(keytype))
<span class="keyword">end</span>
<span class="keyword">end</span>
<span class="comment">-- Clean up afterwards
</span>sys.<span class="function-name">setnonblock</span>(<span class="global">io</span>.stdin, <span class="keyword">false</span>)
sys.<span class="function-name">setconsoleflags</span>(<span class="global">io</span>.stdout, of_out)
sys.<span class="function-name">setconsoleflags</span>(<span class="global">io</span>.stdin, of_in)
sys.<span class="function-name">tcsetattr</span>(<span class="global">io</span>.stdin, sys.TCSANOW, of_attr)
sys.<span class="function-name">setnonblock</span>(<span class="global">io</span>.stdin, of_block)</pre>
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