Here is line 91-113 of twig.imagevue.inc.php
// Filter: shortcode
function shortcode($value) {
return str_replace('[contact]',
"<form data-abide class=contactform>
<div class=honey>
<input type=text class=honey1 name=honey1 placeholder=honey1>
</div>
<div class=honey>
<input type=text class=honey2 name=honey2 placeholder=honey2 value=googooforgaga>
</div>
<div>
<input required type=text name=name placeholder=Name>
</div>
<div>
<input required type=email name=email placeholder=Email>
</div>
<div>
<textarea required rows=6 name=message placeholder='What's up?'></textarea>
</div>
<button type=submit>Send</button>
</form>",
$value);
}