37 lines
No EOL
2.2 KiB
HTML
37 lines
No EOL
2.2 KiB
HTML
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<head>
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<title>getenv — Ludic</title>
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<meta name="description" content="Read an environment variable, returning empty when it is unset.">
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<header class="nav"><div class="wrap nav-in"><a class="brand" href="index.html"><span class="logo">L</span> Ludic</a><button class="nav-toggle" aria-label="Toggle menu" aria-expanded="false">☰</button><nav class="nav-links"><a href="index.html">Home</a><a href="api.html">API Reference</a><a class="nav-cta" href="https://git.workshopsoft.io/workshopsoft/ludic">Source ↗</a></nav></div></header>
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#builtins">Builtin functions</a> <span>›</span> <span class="here">getenv</span></div>
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<div class="item-head">
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<span class="kind-badge kind-builtin">function</span>
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<h1 id="top">getenv</h1>
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</div>
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<code class="sig">getenv(name) -> string</code>
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<div class="desc"><p>Returns the value of the named environment variable, or an empty string when that variable is not set. Use it to make command-line tools and headless runs configurable without recompiling — reading a data directory, a log level, or a seed from the environment. Check for the empty string to detect an unset variable and fall back to a default. Like the other system builtins, it is aimed at tooling rather than a shipped game loop.</p></div>
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<div class="params"><h2>Parameters</h2><div class="param" id="param-name"><code class="pname">name</code><span class="pdesc">the environment variable name to read</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program ReadConfig {
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handler ShowConfig phase Start {
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let level = getenv("LUDIC_LEVEL")
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if len(level) == 0 {
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print("default")
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} else {
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print(level)
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}
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}
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}</pre></div>
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