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import './hidden-review-comments-indicator.css';
import mem from 'mem';
import React from 'dom-chef';
import select from 'select-dom';
import commentIcon from 'octicon/comment.svg';
import features from '../libs/features';
import anchorScroll from '../libs/anchor-scroll';
import onPrFileLoad from '../libs/on-pr-file-load';
// When an indicator is clicked, this will show comments on the current file
const handleIndicatorClick = ({currentTarget}: React.MouseEvent<HTMLElement>): void => {
const commentedLine = currentTarget.closest('tr')!.previousElementSibling!;
const resetScroll = anchorScroll(commentedLine);
currentTarget
.closest('.file.js-file')!
.querySelector<HTMLInputElement>('.js-toggle-file-notes')!
.click();
resetScroll();
};
// `mem` avoids adding the indicator twice to the same thread
const addIndicator = mem((commentThread: HTMLElement): void => {
const commentCount = commentThread.querySelectorAll('.review-comment .js-comment').length;
commentThread.before(
<tr>
<td className="rgh-comments-indicator blob-num" colSpan={2} onClick={handleIndicatorClick}>
<button type="button" className="btn-link">
{commentIcon()}
<span>{commentCount}</span>
</button>
</td>
</tr>
);
});
// Add indicator when the `show-inline-notes` class is removed (i.e. the comments are hidden)
const observer = new MutationObserver(mutations => {
for (const mutation of mutations) {
const file = mutation.target as HTMLElement;
const wasVisible = mutation.oldValue!.includes('show-inline-notes');
const isHidden = !file.classList.contains('show-inline-notes');
if (wasVisible && isHidden) {
for (const thread of select.all('tr.inline-comments', file)) {
addIndicator(thread);
}
}
}
});
function observeFiles(): void {
for (const element of select.all('.file.js-file')) {
// #observe won't observe the same element twice
observer.observe(element, {
attributes: true,
attributeOldValue: true,
attributeFilter: ['class']
});
}
}
function init(): void {
observeFiles();
onPrFileLoad(observeFiles);
}
features.add({
id: __featureName__,
description: 'Adds comment indicators when comments are hidden in PR review.',
screenshot:
'https://user-images.githubusercontent.com/1402241/63112671-011d5580-bfbb-11e9-9e19-53e11641990e.gif',
include: [
features.isPRFiles,
features.isPRCommit
],
load: features.onAjaxedPages,
init
});
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