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import {isRepoCommitList} from 'github-url-detection';
import select from 'select-dom';
import {extractCurrentBranchFromBranchPicker} from './index.js';
import {branchSelector} from './selectors.js';
const typesWithGitRef = new Set(['tree', 'blob', 'blame', 'edit', 'commit', 'commits', 'compare']);
const titleWithGitRef = / at (?<branch>[.\w-/]+)( · [\w-]+\/[\w-]+)?$/i;
/** Must not be async because it's used by GitHubURL. May return different results depending on whether it's called before or after DOM ready */
export default function getCurrentGitRef(): string | undefined {
// Note: This is not in the <head> so it's only available on AJAXed loads.
// It appears on every Code page except `commits` on folders/files
const picker = select(branchSelector);
const refViaPicker = picker && extractCurrentBranchFromBranchPicker(picker);
if (refViaPicker) {
return refViaPicker;
}
// Slashed branches on `commits`, including pages without a branch picker
const branchFromFeed = getCurrentBranchFromFeed();
if (branchFromFeed) {
return branchFromFeed;
}
return getGitRef(location.pathname, document.title);
}
export function getGitRef(pathname: string, title: string): string | undefined {
if (!pathname.startsWith('/')) {
throw new TypeError(`Expected pathname starting with /, got "${pathname}"`);
}
const [type, gitRefIfNonSlashed] = pathname.split('/').slice(3);
if (!type || !typesWithGitRef.has(type)) {
// Root; or piece of information not applicable to the page
return;
}
// Slashed branches on `blob` and `tree`
const parsedTitle = titleWithGitRef.exec(title);
if (parsedTitle) {
return parsedTitle.groups!.branch;
}
// Couldn't ensure it's not slashed, so we'll return the first piece whether correct or not
return gitRefIfNonSlashed;
}
// In <head>, but not reliable https://github.com/refined-github/refined-github/assets/1402241/50357d94-505f-48dc-bd54-74e86b19d642
function getCurrentBranchFromFeed(): string | undefined {
const feedLink = isRepoCommitList() && select('link[type="application/atom+xml"]');
if (!feedLink) {
// Do not throw errors, the element may be missing after AJAX navigation even if on the right page
return;
}
return new URL(feedLink.href)
.pathname
.split('/')
.slice(4) // Drops the initial /user/repo/route/ part
.join('/')
.replace(/\.atom$/, '');
}
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