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<title>Fs — Ludic</title>
<meta name="description" content="The filesystem, wrapped into one safe, ergonomic API — no file descriptors, no byte buffers, no half-written files.">
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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> <span class="here">Fs</span></div>
<div class="item-head"><span class="kind-badge kind-namespace">namespace</span><h1 id="top">Fs</h1></div>
<p class="ns-blurb">The filesystem, wrapped into one safe, ergonomic API — no file descriptors, no byte buffers, no half-written files. The foundation for saves, config, mods, and asset loading: read and write whole files as text, check existence, make directories, copy, and list a folder. The bare <code>file_*</code> builtins remain underneath for streaming; <code>Fs.*</code> is the everyday layer.
Fallible calls surface failure as a value — <code>null</code>, <code>false</code>, or <code>-1</code> — that you branch on, never a crash (a first-class <code>try/else</code> lands with the error-handling work). Writes are atomic (written to a temporary file and renamed into place), so a crash mid-write never corrupts the previous file. <a href="fs-list"><code>list</code></a> returns entries sorted, so a directory walk is reproducible across runs and platforms.
Paths are <code>/</code>-separated over the native (macOS/BSD) filesystem — the fully supported target today; a sandboxed virtual filesystem for wasm and recursive directory copy are follow-ups. Text helpers are UTF-8 (they pair with <a href="ns-Unicode"><code>Unicode</code></a>); use <a href="ns-Path"><code>Path</code></a> to build the paths and <a href="ns-Os"><code>Os</code></a> for per-user locations.</p>
<div class="ns-methods"><a class="ns-method" href="fs-exists.html"><code class="nm-sig">Fs.exists(p) -&gt; bool</code><span class="nm-tip">Does a path exist?</span></a><a class="ns-method" href="fs-is_dir.html"><code class="nm-sig">Fs.is_dir(p) -&gt; bool</code><span class="nm-tip">Is a path a directory?</span></a><a class="ns-method" href="fs-read_text.html"><code class="nm-sig">Fs.read_text(p) -&gt; string</code><span class="nm-tip">Read a whole file as a string.</span></a><a class="ns-method" href="fs-write_text.html"><code class="nm-sig">Fs.write_text(p, s) -&gt; bool</code><span class="nm-tip">Write a string to a file (atomically).</span></a><a class="ns-method" href="fs-append_text.html"><code class="nm-sig">Fs.append_text(p, s) -&gt; bool</code><span class="nm-tip">Append a string to a file.</span></a><a class="ns-method" href="fs-remove.html"><code class="nm-sig">Fs.remove(p) -&gt; bool</code><span class="nm-tip">Delete a file.</span></a><a class="ns-method" href="fs-size.html"><code class="nm-sig">Fs.size(p) -&gt; int</code><span class="nm-tip">File size in bytes.</span></a><a class="ns-method" href="fs-mkdir.html"><code class="nm-sig">Fs.mkdir(p) -&gt; bool</code><span class="nm-tip">Create a directory and its parents.</span></a><a class="ns-method" href="fs-copy.html"><code class="nm-sig">Fs.copy(src, dst) -&gt; bool</code><span class="nm-tip">Copy a file byte-for-byte.</span></a><a class="ns-method" href="fs-list.html"><code class="nm-sig">Fs.list(dir) -&gt; []string</code><span class="nm-tip">Directory entries, sorted.</span></a></div>
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