github-url-detection

Which GitHub page are you on? Is it an issue? Is it a list? Perfect for your WebExtension or userscript.

Battle-tested in Refined GitHub extension.

• Try the live demo
• See the code and expected URLs for every detection

Install

npm install github-url-detection

// This package is pure ESM
import * as pageDetect from 'github-url-detection';

Usage

const href = 'https://github.com/refined-github/github-url-detection/issues/1';
if (pageDetect.isIssue(new URL(href))) { // Pass the URL as an `URL` object
	alert('The passed URL is of an issue!')
}

if (pageDetect.isRepo()) { // Uses `window.location.href` by default
	alert('You’re looking at a repo!')
}

if (pageDetect.isIssueOrPRList()) {
	alert('You’re looking at a issues and PRs list!')
}

API

Most detections are URL-based while others need access to the current document. You can determine which ones are URL-based by looking at their signature: URL-based functions have a url parameter.

URL-based detections

By default, URL-based detections use the location global if you don't pass a url argument.

if (pageDetect.isIssueOrPRList()) {
	alert('You’re looking at a issues or PRs list!')
}

if (pageDetect.isIssueOrPRList(new URL('https://github.com/refined-github/github-url-detection/pulls'))) {
	alert('You’re looking at a issues or PRs list!')
}

Notice that the url parameter is not a plain string but it has to be a proper URL or location object.

Document-based detections

By default, document-based detections use the document global, which means they can only be used if you have the whole page, you can't just test any random URL string.

if (pageDetect.isOrganizationProfile()) {
	alert('You’re on an organization profile, like https://github.com/babel')
}

Async detections with waitFor

The waitFor helper function allows you to wait for a detection to become true by repeatedly checking it on each animation frame. This is useful for DOM-based detections that need to wait for elements to appear before the document is fully loaded.

import {utils, isOrganizationProfile} from 'github-url-detection';

async function init() {
	// Wait for the detection to return true or for the document to be complete
	if (!await utils.waitFor(isOrganizationProfile)) {
		return; // Not an organization profile
	}

	// The page is now confirmed to be an organization profile
	console.log('On organization profile!');
}

The waitFor function:

• Repeatedly calls the detection function on each animation frame
• Stops when the detection returns true or when document.readyState is 'complete'
• Returns the final result of the detection
• Works with any detection function that returns a boolean

Related

• github-reserved-names - Get a list, or check if a user or organization name is reserved by GitHub.
• shorten-repo-url - Shorten GitHub links like GitHub shortens Issues and Commit links.

License

MIT © Federico Brigante