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import React from 'dom-chef';
import * as pageDetect from 'github-url-detection';
import {VersionsIcon} from '@primer/octicons-react';
import features from '../feature-manager.js';
import observe from '../helpers/selector-observer.js';
import * as api from '../github-helpers/api.js';
import GitHubURL from '../github-helpers/github-url.js';
async function getPreviousCommitForFile(pathname: string): Promise<string> {
const {user, repository, branch, filePath} = new GitHubURL(pathname);
const {resource} = await api.v4(`
resource(url: "/${user}/${repository}/commit/${branch}") {
... on Commit {
history(path: "${filePath}", first: 2) {
nodes {
oid
}
}
}
}
`);
// The first commit refers to the current one, so we skip it
return resource.history.nodes[1].oid;
}
async function add(historyButton: HTMLElement): Promise<void> {
const previousCommit = await getPreviousCommitForFile(location.href);
if (!previousCommit) {
return;
}
const url = new GitHubURL(location.href)
.assign({branch: previousCommit});
historyButton.before(
<a href={url.href} className="UnderlineNav-item tooltipped tooltipped-n ml-2" aria-label="View previous version">
<VersionsIcon className="UnderlineNav-octicon mr-0"/>
</a>,
);
}
async function init(signal: AbortSignal): Promise<void> {
observe('a[aria-label="History"].react-last-commit-history-group', add, {signal});
}
void features.add(import.meta.url, {
include: [
pageDetect.isSingleFile,
],
init,
});
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