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<!DOCTYPE html>
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<h1 class="main">Tools</h1>
<h2 id="v-fmt">v fmt <a href="tools.html#v-fmt" class="header-anchor" aria-hidden="true">#</a></h2>
<p>You don't need to worry about formatting your code or setting style guidelines.
<code>v fmt</code> takes care of that:</p>
<pre><code class="language-shell">v fmt file.v
</code></pre>
<p>It's recommended to set up your editor, so that <code>v fmt -w</code> runs on every save.
A vfmt run is usually pretty cheap (takes <30ms).</p>
<p>Always run <code>v fmt -w file.v</code> before pushing your code.</p>
<p>The formatter checks syntax without requiring the code to pass semantic checks.
For example, it preserves closure captures and loop binder mutability while you edit
incomplete code.</p>
<p>Adjacent struct fields align their inline attributes, including fields with default values.
Mixed volatile and non-volatile fields account for the width of the <code>volatile </code> prefix.
The alignment accounts for the type, the <code>=</code> separator, and the default value:</p>
<div class="language-v">struct SearchOptions {
quiet bool @[long: quiet; short: q]
thold f64 = 0.9 @[long: thold; short: t]
query string @[tail]
}
</div>
<p>Fields written on one line with semicolons retain their attribute alignment after formatting.
An attributed default that spans several lines separates the attribute alignment groups around it.
Comments between a default value and its attributes stay with that field, after its attributes.
Deferred inline comments align with neighboring trailing field comments on the first pass.
Fields following a multiline attributed default start a fresh trailing comment alignment group.
Comments inside a default expression remain inside that expression.</p>
<p>Backend options before <code>fmt</code>, such as <code>v -b arm64 fmt file.v</code>, or in <code>VFLAGS</code> are honored.
The <code>arm64</code> and <code>eval</code> backends use the same source formatting rules as <code>c</code>.</p>
<p>A function, loop, <code>if</code> branch or <code>match</code> branch whose body is a single statement
stays on one line when you write it that way and it fits in 100 columns:</p>
<div class="language-v">struct Point {
x int
y int
}
fn (p Point) sum() int { return p.x + p.y }
fn first_positive(a []int) int {
for x in a { if x > 0 { return x } }
return 0
}
</div>
<p>A comment after a compact <code>match</code> branch's closing brace stays with that branch,
including the final <code>else</code> branch.</p>
<p>During the formatter transition, <code>v fmt -verify</code> and <code>v fmt -c</code> accept
files matching either current or legacy vfmt output. <code>v fmt -w</code> uses current formatting,
so it may rewrite a file accepted by either check mode.</p>
<h3 id="disabling-the-formatting-locally">Disabling the formatting locally <a href="tools.html#disabling-the-formatting-locally" class="header-anchor" aria-hidden="true">#</a></h3>
<p>To disable formatting for a block of code, wrap it with <code>// vfmt off</code> and
<code>// vfmt on</code> comments.</p>
<p>These directives retain their source order relative to struct field attributes.
Attribute groups that cross a directive boundary retain the affected field's source text.
This preservation also applies to the first field in a struct.
Compile-time members also provide source boundaries for following field attributes.