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import select from 'select-dom';
import cache from 'webext-storage-cache';
import * as api from './api';
import {getRepoURL} from './utils';
// This regex should match all of these combinations:
// "This branch is even with master."
// "This branch is 1 commit behind master."
// "This branch is 1 commit ahead of master."
// "This branch is 1 commit ahead, 27 commits behind master."
const branchInfoRegex = /([^ ]+)\.$/;
function parseBranchFromDom(): string | undefined {
if (select.exists('.repohead h1 .octicon-repo-forked')) {
return; // It's a fork, no "default branch" info available #1132
}
// We can find the name in the infobar, available in folder views
const branchInfo = select('.branch-infobar');
if (!branchInfo) {
return;
}
// Parse the infobar
const matches = branchInfoRegex.exec(branchInfo.textContent!.trim());
return matches ? matches[1] : undefined;
}
async function fetchFromApi(): Promise<string> {
const response = await api.v3(`repos/${getRepoURL()}`);
return response.default_branch as string;
}
export default async function (): Promise<string> {
const cached = await cache.get<string>(`default-branch:${getRepoURL()}`);
if (cached) {
return cached;
}
const branch = parseBranchFromDom() || await fetchFromApi();
await cache.set(`default-branch:${getRepoURL()}`, branch, 1);
return branch;
}
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