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<title>Os.save_dir — Ludic</title>
<meta name="description" content="Per-user save directory for an app.">
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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="ns-os.html">Os</a> <span>›</span> <span class="here">Os.save_dir</span></div>
<div class="item-head">
<span class="kind-badge kind-method">method</span>
<h1 id="top">Os.save_dir</h1>
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<code class="sig">Os.save_dir(app) -&gt; string</code>
<div class="desc"><p>The per-user directory where an application should store save files, named for the app. Which directory that is, is the platform's decision, not the program's:</p><p>| | |
| --- | --- |
| macOS | <code>~/Library/Application Support/&lt;app&gt;</code> |
| Linux | <code>$XDG_DATA_HOME/&lt;app&gt;</code>, or <code>~/.local/share/&lt;app&gt;</code> |</p><p>An XDG variable that is set but empty falls back to the default, as the spec requires. The path is returned as a string; creating the directory and reading/writing files is the filesystem library's job (see the <a href="os-config_dir"><code>config_dir</code></a>/<a href="os-cache_dir"><code>cache_dir</code></a> companions).</p><p>On macOS <code>save_dir</code> and <code>config_dir</code> are the same directory — Apple's home for a config file that is not an <code>NSUserDefaults</code> plist is Application Support too. On Linux XDG separates them, and so does this.</p></div>
<div class="params"><h2>Parameters</h2><div class="param" id="param-app"><code class="pname">app</code><span class="pdesc">the application name (used as the folder name)</span></div></div>
<div class="examples"><h2>Example</h2><pre data-lang="ludic">program SaveDir {
entry {
let dir = Os.save_dir("MyGame")
print(len(dir))
}
}</pre></div>
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