Filter GitHub pull request changed files by extension

github.pr.toggle.file.extension.js

/**
 * Prompt and filter a PR's changed files by the given extension(s).
 */
var els=document.getElementsByClassName('user-select-contain');
var input = prompt('File extension(s), comma separated');

els = [].forEach.call(els, function(el) {
    var parent = el;

    while (parent && !parent.classList.contains('js-details-container')) {
        parent = parent.parentNode;
    }

    var exts = input.split(',');
    var matches = exts.filter(function(ext) {
        return el.textContent.trim().endsWith(ext.trim());
    });

    parent.style.display = matches.length ? 'block' : 'none';
});

// bookmarklet (includes String.prototype.endsWith polyfill)
javascript:(function(){String.prototype.endsWith||(String.prototype.endsWith=function(t,e){var n=this.toString();("number"!=typeof e||!isFinite(e)||Math.floor(e)!==e||e>n.length)&&(e=n.length),e-=t.length;var i=n.indexOf(t,e);return-1!==i&&i===e});var els=document.getElementsByClassName("user-select-contain"),input=prompt("File extension(s), comma separated");els=[].forEach.call(els,function(t){for(var e=t;e&&!e.classList.contains("js-details-container");)e=e.parentNode;var n=input.split(","),i=n.filter(function(e){return t.textContent.trim().endsWith(e.trim())});e.style.display=i.length?"block":"none"});}())