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import React from 'dom-chef';
import domify from 'doma';
import select from 'select-dom';
import * as pageDetect from 'github-url-detection';
import features from '.';
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 {
// Fetch via background.js due to CORB policies
const gistData = await browser.runtime.sendMessage({fetchJSON: `${link.href}.json`});
if (gistData.div.length > 10_000) {
info.textContent = ' (too large to embed)';
return;
}
const fileCount: number = gistData.files.length;
if (fileCount > 1) {
info.textContent = ` (${fileCount} files)`;
} else {
const container = <div/>;
container.attachShadow({mode: 'open'}).append(
<style>{`
.gist .gist-data {
max-height: 16em;
overflow-y: auto;
}
`}
</style>,
<link rel="stylesheet" href={gistData.stylesheet}/>,
domify.one(gistData.div)!
);
link.parentElement!.after(container);
info.remove();
}
} catch {
info.remove();
}
}
function init(): void {
for (const link of select.all('.js-comment-body p a:only-child')) {
if (isGist(link) && isOnlyChild(link)) {
void embedGist(link);
}
}
}
void features.add(__filebasename, {
include: [
pageDetect.hasComments
],
init
});
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