mutations

GitHub mutations observer library script

Version vom 12.04.2017. Aktuellste Version

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyforks.org/scripts/28721/187820/mutations.js

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/* GitHub mutations observer library script v0.1.3
 * Detect changes to various elements and trigger an event
 * Copyright © 2017 Rob Garrison
 * License: MIT
 */
/* jshint esnext:true, unused:true */
(() => {
	"use strict";

	// prefix for event & document body class name, e.g. "ghmo:container"
	const prefix = "ghmo",
		targets = {
			// pjax container (covers general, repo & gists)
			"[data-pjax-container]": {
				count: 0,
				name: "container"
			},
			// comment preview active
			".js-preview-body": {
				count: 0,
				name: "preview"
			},
			// progressively loaded comments; "# items not shown"
			// example: https://github.com/isaacs/github/issues/18
			".js-discussion": {
				count: 0,
				name: "comments"
			},
			// progressively loaded content (diff files)
			".js-diff-progressive-container, .data.blob-wrapper, .js-diff-load-container": {
				count: 0,
				name: "diff"
			}
		},
		list = Object.keys(targets),
		container = document.querySelector("body");

	let timer;

	function fireEvents() {
		list.forEach(selector => {
			if (targets[selector].count > 0) {
				// event => "ghmo:container", "ghmo:comments"
				const event = new Event(prefix + ":" + targets[selector].name);
				document.dispatchEvent(event);
			}
			targets[selector].count = 0;
		});
	}
	console.log('mutation observer init');
	// prevent script from installing more than once
	if (!container.classList.contains(prefix + "-enabled")) {
		container.classList.add(prefix + "-enabled");

		new MutationObserver(mutations => {
			mutations.forEach(mutation => {
				clearTimeout(timer);
				const target = mutation.target;
				if (target) {
					list.forEach(selector => {
						if (target.matches(selector)) {
							targets[selector].count++;
						}
					});
				}
				timer = setTimeout(() => {
					fireEvents();
				}, 200);
			});
		}).observe(container, {
			childList: true,
			subtree: true
		});

	}

})();