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import React from 'dom-chef';
import domify from 'doma';
import select from 'select-dom';
import features from '../libs/features';
const isGist = (link: HTMLAnchorElement): boolean =>
!link.pathname.includes('.') && // Exclude links to embed files
(
(link.hostname.startsWith('gist.') && link.pathname.includes('/', 1)) || // Exclude user links
link.pathname.startsWith('gist/')
);
const isOnlyChild = (link: HTMLAnchorElement): boolean => link.textContent!.trim() === link.parentNode!.textContent!.trim();
async function embedGist(link: HTMLAnchorElement): Promise<void> {
const info = <em> (loading)</em>;
link.after(info);
try {
const response = await fetch(`${link.href}.json`);
const gistData = await response.json();
const files = domify.one(gistData.div)!;
const fileCount = files.children.length;
if (fileCount > 1) {
info.textContent = ` (${fileCount} files)`;
} else {
link.parentElement!.attachShadow({mode: 'open'}).append(
<style>{`
.gist .gist-data {
max-height: 16em;
overflow-y: auto;
}
`}</style>,
<link rel="stylesheet" href={gistData.stylesheet} />,
files
);
}
} catch {
info.replaceWith(' (embed failed)');
}
}
function init(): void {
select.all<HTMLAnchorElement>('.js-comment-body p a:only-child')
.filter(item => isGist(item) && isOnlyChild(item))
.forEach(embedGist);
}
features.add({
id: __featureName__,
description: 'Embeds linked gists.',
screenshot: 'https://user-images.githubusercontent.com/6978877/33911900-c62ee968-df8b-11e7-8685-506ffafc60b4.',
include: [
features.hasComments
],
load: features.onAjaxedPages,
init
});
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