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jerone / Twitter profile replies hider

// ==UserScript==
// @name             Twitter profile replies hider
// @namespace        https://github.com/jerone/UserScripts
// @description      Hide replies on Twitter profiles
// @author           jerone
// @copyright        2014+, jerone (https://github.com/jerone)
// @license          CC-BY-NC-SA-4.0; https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
// @license          GPL-3.0-or-later; http://www.gnu.org/licenses/gpl-3.0.txt
// @homepage         https://github.com/jerone/UserScripts/tree/master/Hide_replies_on_Twitter_user_account
// @homepageURL      https://github.com/jerone/UserScripts/tree/master/Hide_replies_on_Twitter_user_account
// @downloadURL      https://github.com/jerone/UserScripts/raw/master/Hide_replies_on_Twitter_user_account/163703.user.js
// @updateURL        https://github.com/jerone/UserScripts/raw/master/Hide_replies_on_Twitter_user_account/163703.user.js
// @supportURL       https://github.com/jerone/UserScripts/issues
// @contributionURL  https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=VCYMHWQ7ZMBKW
// @include          *://twitter.com/*
// @exclude          *://twitter.com/
// @exclude          *://twitter.com
// @version          5
// @grant            none
// ==/UserScript==

(function () {
	var settingsKey = "userscript_hide_replies",
		selector = ".js-stream-tweet[data-is-reply-to]",
		textOn = "Show Replies",
		textOff = "Hide Replies";

	function addMenuItem() {
		// ignore own account;
		//if(document.body.classList.contains("logged-in") && location.href === document.querySelector(".profile a").href) return;

		// tweets timeline;
		var timeline =
			document.getElementById("stream-items-id") ||
			document.getElementsByClassName("GridTimeline")[0];
		if (!timeline) return;

		// user menu;
		var menuDivider = document.getElementsByClassName(
			"dropdown-divider is-following",
		)[0];
		if (!menuDivider) return;

		// setting;
		var settingSaved = !!~~localStorage.getItem(settingsKey, +true);

		// work-around to get new tweets;
		var loadTweets = function () {
			var y = 0;
			function scroll() {
				y++;
				window.scrollTo(
					document.documentElement.scrollLeft,
					document.documentElement.scrollTop + 1,
				);
				if (y < 10) {
					window.setTimeout(scroll, 13);
				} else {
					window.scrollTo(
						document.documentElement.scrollLeft,
						document.documentElement.scrollTop - y,
					);
				}
			}
			window.setTimeout(scroll, 13);
		};

		// toggle visibility;
		var toggle = function (hide, init) {
			window.setTimeout(function () {
				Array.forEach(
					document.querySelectorAll(selector),
					function (tweet) {
						tweet.style.display = !hide ? "block" : "none";
					},
				);

				if (hide && init) {
					loadTweets();
				}
			});
		};

		// menu item;
		var liShow = document.createElement("li");
		liShow.appendChild(document.createTextNode(textOn));
		liShow.classList.add("dropdown-link");
		liShow.style.display = settingSaved ? "block" : "none";
		menuDivider.parentNode.insertBefore(liShow, menuDivider.nextSibling);

		var liHide = document.createElement("li");
		liHide.appendChild(document.createTextNode(textOff));
		liHide.classList.add("dropdown-link");
		liHide.style.display = !settingSaved ? "block" : "none";
		menuDivider.parentNode.insertBefore(liHide, menuDivider.nextSibling);

		liShow.addEventListener("click", function (e) {
			e.preventDefault();
			localStorage.setItem(settingsKey, +false);
			toggle(false);
			liShow.style.display = "none";
			liHide.style.display = "block";
			return false;
		});

		liHide.addEventListener("click", function (e) {
			e.preventDefault();
			localStorage.setItem(settingsKey, +true);
			toggle(true);
			liShow.style.display = "block";
			liHide.style.display = "none";
			return false;
		});

		// new tweets are loaded, handle accordingly;
		new MutationObserver(function (mutations) {
			mutations.forEach(function () {
				toggle(!!~~localStorage.getItem(settingsKey, +true));
			});
		}).observe(timeline, { childList: true });

		// load previous state;
		toggle(settingSaved, true);
	}

	window.setTimeout(function () {
		addMenuItem();

		unsafeWindow.$(document).on("uiPageChanged", function () {
			addMenuItem();
		});
	}, 1);

	/* useful for the user popup;
	function MutationObserverStyle(elem, property, fn) {
		var that = this;
		that.propertyChanged = false;
		new MutationObserver(function(mutations) {
			mutations.forEach(function(mutation) {
				if (that.propertyChanged !== (mutation.target.style[property] != "none")) {
					that.propertyChanged = !that.propertyChanged;
					fn();
				}
			});
		}).observe(elem, { attributes: true, attributeFilter: ["style"] });
	}

	MutationObserverStyle(document.getElementById("profile_popup"), "display", function() {
		console.log("MutationObserverStyle propertyChanged");
	});
	*/

	/* alternative page load;
	var window_History_prototype_pushState = window.History.prototype.pushState;
	window.History.prototype.pushState = function() {
		window_History_prototype_pushState.apply(window.history, arguments);
		window.setTimeout(function() {
			//init();
			document.title = "3" + document.title;
		});
	};
	*/
})();