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import React from 'dom-chef';
import select from 'select-dom';
import onetime from 'onetime';
import elementReady from 'element-ready';
import * as pageDetect from 'github-url-detection';
import features from '.';
import * as api from '../github-helpers/api';
import GitHubURL from '../github-helpers/github-url';
import {getChangesToFileInCommit} from './follow-file-renames';
import getDefaultBranch from '../github-helpers/get-default-branch';
import {getCleanPathname} from '../github-helpers';
function getType(): string {
return location.pathname.split('/').pop()!.includes('.') ? 'file' : 'object';
}
async function is404(url: string): Promise<boolean> {
const {status} = await fetch(url, {method: 'head'});
return status === 404;
}
function getStrikeThrough(text: string): HTMLElement {
return <del className="color-text-tertiary">{text}</del>; /* GHE #4121 */
}
async function checkAnchor(anchor: HTMLAnchorElement): Promise<void> {
if (await is404(anchor.href)) {
anchor.replaceWith(getStrikeThrough(anchor.textContent!));
}
}
function parseCurrentURL(): string[] {
const parts = getCleanPathname().split('/');
if (parts[2] === 'blob') { // Blob URLs are never useful
parts[2] = 'tree';
}
return parts;
}
async function getLatestCommitToFile(branch: string, filePath: string): Promise<string | void> {
const {repository} = await api.v4(`
repository() {
object(expression: "${branch}") {
... on Commit {
history(first: 1, path: "${filePath}") {
nodes {
oid
}
}
}
}
}
`);
const commit = repository.object?.history.nodes[0];
return commit.oid;
}
async function getUrlToFileOnDefaultBranch(): Promise<string | void> {
const parsedUrl = new GitHubURL(location.href);
if (!parsedUrl.branch) {
return;
}
parsedUrl.assign({branch: await getDefaultBranch()});
const urlOnDefault = parsedUrl.toString();
if (urlOnDefault !== location.href && !await is404(urlOnDefault)) {
return urlOnDefault;
}
}
async function showMissingPart(): Promise<void> {
const parts = parseCurrentURL();
const bar = <h2 className="container mt-4 text-center"/>;
for (const [i, part] of parts.entries()) {
if (i === 2 && ['tree', 'blob', 'edit'].includes(part)) {
// Exclude parts that don't exist as standalones
continue;
}
if (i === parts.length - 1) {
// The last part of the URL is a known 404
bar.append(' / ', getStrikeThrough(part));
} else {
const pathname = '/' + parts.slice(0, i + 1).join('/');
bar.append(i ? ' / ' : '', <a href={pathname}>{part}</a>);
}
}
select('main > :first-child, #parallax_illustration')!.after(bar);
// Check parts from right to left; skip the last part
for (let i = bar.children.length - 2; i >= 0; i--) {
void checkAnchor(bar.children[i] as HTMLAnchorElement);
}
}
async function showDefaultBranchLink(): Promise<void> {
const urlToFileOnDefaultBranch = await getUrlToFileOnDefaultBranch();
if (!urlToFileOnDefaultBranch) {
return;
}
select('main > .container-lg')!.before(
<p className="container mt-4 text-center">
<a href={urlToFileOnDefaultBranch}>This {getType()}</a> exists on the default branch.
</p>,
);
}
async function showAlternateLink(): Promise<void> {
const url = new GitHubURL(location.href);
if (!url.branch || !url.filePath) {
return;
}
const commitSha = await getLatestCommitToFile(url.branch, url.filePath);
if (!commitSha) {
return;
}
const fileChanges = await getChangesToFileInCommit(commitSha, url.filePath);
if (!fileChanges) {
return;
}
url.assign({route: 'commits'});
const commitHistory = <a href={url.toString()}>Commit history</a>;
url.assign({route: 'blob', branch: fileChanges.commit.parentSha, filePath: url.filePath});
const lastVersionUrl = fileChanges.file.status === 'removed' ? fileChanges.file.blob_url : url.toString();
const lastVersion = <a href={lastVersionUrl}>This {getType()}</a>;
const permalink = <a href={fileChanges.commit.url}><relative-time datetime={fileChanges.commit.date}/></a>;
const verb = fileChanges.file.status === 'removed'
? 'deleted'
: <a href={fileChanges.file.blob_url}>moved</a>;
select('main > .container-lg')!.before(
<p className="container mt-4 text-center">
{lastVersion} was {verb} ({permalink}) - {commitHistory}.
</p>,
);
}
function init(): false | void {
const parts = parseCurrentURL();
if (parts.length < 2) {
return false;
}
void showMissingPart();
if (['tree', 'blob', 'edit'].includes(parts[2])) {
void showDefaultBranchLink();
void showAlternateLink();
}
}
async function initPRCommit(): Promise<void | false> {
const commitUrl = location.href.replace(/pull\/\d+\/commits/, 'commit');
if (await is404(commitUrl)) {
return false;
}
const blankSlateParagraph = await elementReady('.blankslate p', {waitForChildren: false});
blankSlateParagraph!.after(
<p>You can also try to <a href={commitUrl}>view the detached standalone commit</a>.</p>,
);
}
void features.add(__filebasename, {
include: [
pageDetect.is404,
],
init: onetime(init),
}, {
include: [
pageDetect.isPRCommit404,
],
awaitDomReady: false,
init: onetime(initPRCommit),
});
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