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36<h2>Examples</h2>
37<ul class="nowrap">
38 <li><strong>compat.lua</strong></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>
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68 <h2>compat.lua</h2>
69<pre>
70<span class="comment">-- This example shows how to remove platform differences to create a
71</span><span class="comment">-- cross-platform level playing field.
72</span>
73<span class="keyword">local</span> sys = <span class="global">require</span> <span class="string">"system"</span>
74
75
76
77<span class="keyword">if</span> sys.windows <span class="keyword">then</span>
78 <span class="comment">-- Windows holds multiple copies of environment variables, to ensure <code>getenv</code>
79</span> <span class="comment">-- returns what <code>setenv</code> sets we need to use the <a href="../modules/system.html#getenv">system.getenv</a> instead of
80</span> <span class="comment">-- <a href="https://www.lua.org/manual/5.4/manual.html#pdf-os.getenv">os.getenv</a>.
81</span> <span class="global">os</span>.getenv = sys.getenv <span class="comment">-- luacheck: ignore
82</span>
83 <span class="comment">-- Set console output to UTF-8 encoding.
84</span> sys.<span class="function-name">setconsoleoutputcp</span>(sys.CODEPAGE_UTF8)
85
86 <span class="comment">-- Set up the terminal to handle ANSI escape sequences on Windows.
87</span> <span class="keyword">if</span> sys.<span class="function-name">isatty</span>(<span class="global">io</span>.stdout) <span class="keyword">then</span>
88 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)
89 <span class="keyword">end</span>
90 <span class="keyword">if</span> sys.<span class="function-name">isatty</span>(<span class="global">io</span>.stderr) <span class="keyword">then</span>
91 sys.<span class="function-name">setconsoleflags</span>(<span class="global">io</span>.stderr, sys.<span class="function-name">getconsoleflags</span>(<span class="global">io</span>.stderr) + sys.COF_VIRTUAL_TERMINAL_PROCESSING)
92 <span class="keyword">end</span>
93 <span class="keyword">if</span> sys.<span class="function-name">isatty</span>(<span class="global">io</span>.stdin) <span class="keyword">then</span>
94 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>.stdout) + sys.ENABLE_VIRTUAL_TERMINAL_INPUT)
95 <span class="keyword">end</span>
96
97
98<span class="keyword">else</span>
99 <span class="comment">-- On Posix, one can set a variable to an empty string, but on Windows, this
100</span> <span class="comment">-- will remove the variable from the environment. To make this consistent
101</span> <span class="comment">-- across platforms, we will remove the variable from the environment if the
102</span> <span class="comment">-- value is an empty string.
103</span> <span class="keyword">local</span> old_setenv = sys.setenv
104 <span class="keyword">function</span> sys.<span class="function-name">setenv</span>(name, value)
105 <span class="keyword">if</span> value == <span class="string">""</span> <span class="keyword">then</span> value = <span class="keyword">nil</span> <span class="keyword">end</span>
106 <span class="keyword">return</span> <span class="function-name">old_setenv</span>(name, value)
107 <span class="keyword">end</span>
108<span class="keyword">end</span></pre>
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