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<!DOCTYPE html>
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<a class="link" href="introduction.html">Introduction</a>
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<a class="link" href="appendix-i-keywords.html">Appendix I: Keywords</a>
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<a class="link" href="appendix-ii-operators.html">Appendix II: Operators</a>
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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>
<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>
<pre><code class="language-bash">// Not affected by fmt
// vfmt off
... your code here ...
// vfmt on
// Affected by fmt
... your code here ...
</code></pre>
<h2 id="v-shader">v shader <a href="tools.html#v-shader" class="header-anchor" aria-hidden="true">#</a></h2>
<p>You can use GPU shaders with V graphical apps. You write your shaders in an
<a href="https://github.com/vlang/v/blob/1d8ece7/examples/sokol/02_cubes_glsl/cube_glsl.glsl">annotated GLSL dialect</a>
and use <code>v shader</code> to compile them for all supported target platforms.</p>
<pre><code class="language-shell">v shader /path/to/project/dir/or/file.v
</code></pre>
<p>Currently you need to
<a href="https://github.com/vlang/v/blob/c14c324/examples/sokol/02_cubes_glsl/cube_glsl.v#L43-L46">include a header and declare a glue function</a>
before using the shader in your code.</p>
<h2 id="profiling">Profiling <a href="tools.html#profiling" class="header-anchor" aria-hidden="true">#</a></h2>
<p>V has good support for profiling your programs: <code>v -profile profile.txt run file.v</code>
That will produce a profile.txt file, which you can then analyze.</p>
<p>The generated profile.txt file will have lines with 4 columns:
a) how many times a function was called
b) how much time in total a function took (in ms)
c) how much time on average, a call to a function took (in ns)
d) the name of the v function</p>
<p>You can sort on column 3 (average time per function) using:
<code>sort -n -k3 profile.txt|tail</code></p>
<p>You can also use stopwatches to measure just portions of your code explicitly:</p>
<div class="language-v">import time
fn main() {
sw := time.new_stopwatch()
println('Hello world')
println('Greeting the world took: ${sw.elapsed().nanoseconds()}ns')
}
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