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<h1>Lua-System</h1>
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<h2>Examples</h2>
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<li><strong>compat.lua</strong></li>
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<h2>compat.lua</h2>
<pre>
<span class="comment">-- This example shows how to remove platform differences to create a
</span><span class="comment">-- cross-platform level playing field.
</span>
<span class="keyword">local</span> sys = <span class="global">require</span> <span class="string">"system"</span>
<span class="keyword">if</span> sys.windows <span class="keyword">then</span>
<span class="comment">-- Windows holds multiple copies of environment variables, to ensure <code>getenv</code>
</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
</span> <span class="comment">-- <a href="https://www.lua.org/manual/5.4/manual.html#pdf-os.getenv">os.getenv</a>.
</span> <span class="global">os</span>.getenv = sys.getenv <span class="comment">-- luacheck: ignore
</span>
<span class="comment">-- Set console output to UTF-8 encoding.
</span> sys.<span class="function-name">setconsoleoutputcp</span>(sys.CODEPAGE_UTF8)
<span class="comment">-- Set up the terminal to handle ANSI escape sequences on Windows.
</span> <span class="keyword">if</span> sys.<span class="function-name">isatty</span>(<span class="global">io</span>.stdout) <span class="keyword">then</span>
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)
<span class="keyword">end</span>
<span class="keyword">if</span> sys.<span class="function-name">isatty</span>(<span class="global">io</span>.stderr) <span class="keyword">then</span>
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)
<span class="keyword">end</span>
<span class="keyword">if</span> sys.<span class="function-name">isatty</span>(<span class="global">io</span>.stdin) <span class="keyword">then</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>.stdout) + sys.ENABLE_VIRTUAL_TERMINAL_INPUT)
<span class="keyword">end</span>
<span class="keyword">else</span>
<span class="comment">-- On Posix, one can set a variable to an empty string, but on Windows, this
</span> <span class="comment">-- will remove the variable from the environment. To make this consistent
</span> <span class="comment">-- across platforms, we will remove the variable from the environment if the
</span> <span class="comment">-- value is an empty string.
</span> <span class="keyword">local</span> old_setenv = sys.setenv
<span class="keyword">function</span> sys.<span class="function-name">setenv</span>(name, value)
<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>
<span class="keyword">return</span> <span class="function-name">old_setenv</span>(name, value)
<span class="keyword">end</span>
<span class="keyword">end</span></pre>
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