1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<head>
<title>Lua-System docs</title>
<link rel="stylesheet" href="../ldoc.css" type="text/css" />
</head>
<body>
<div id="container">
<div id="product">
<div id="product_logo"></div>
<div id="product_name"><big><b></b></big></div>
<div id="product_description"></div>
</div> <!-- id="product" -->
<div id="main">
<!-- Menu -->
<div id="navigation">
<br/>
<h1>Lua-System</h1>
<ul>
<li><a href="../index.html">Index</a></li>
</ul>
<h2>Examples</h2>
<ul class="nowrap">
<li><a href="../examples/compat.lua.html">compat.lua</a></li>
<li><a href="../examples/flag_debugging.lua.html">flag_debugging.lua</a></li>
<li><a href="../examples/password_input.lua.html">password_input.lua</a></li>
<li><strong>read.lua</strong></li>
<li><a href="../examples/readline.lua.html">readline.lua</a></li>
<li><a href="../examples/spinner.lua.html">spinner.lua</a></li>
<li><a href="../examples/spiral_snake.lua.html">spiral_snake.lua</a></li>
<li><a href="../examples/terminalsize.lua.html">terminalsize.lua</a></li>
</ul>
<h2>Modules</h2>
<ul class="nowrap">
<li><a href="../modules/system.html">system</a></li>
</ul>
<h2>Classes</h2>
<ul class="nowrap">
<li><a href="../classes/bitflags.html">bitflags</a></li>
</ul>
<h2>Topics</h2>
<ul class="">
<li><a href="../topics/01-introduction.md.html">1. Introduction</a></li>
<li><a href="../topics/02-development.md.html">2. Development</a></li>
<li><a href="../topics/03-terminal.md.html">3. Terminal functionality</a></li>
<li><a href="../topics/CHANGELOG.md.html">CHANGELOG</a></li>
<li><a href="../topics/LICENSE.md.html">MIT License</a></li>
</ul>
</div>
<div id="content">
<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>
</div> <!-- id="content" -->
</div> <!-- id="main" -->
<div id="about">
<i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
<i style="float:right;">Last updated 2024-06-20 23:11:37 </i>
</div> <!-- id="about" -->
</div> <!-- id="container" -->
</body>
</html>
|
