MediaWiki:Gadget-FlagMovedPageForDeletion.js

// <nowiki>
// Idea: set a local storage item to remember which page got moved. 
// Then, on the "other side", make an automated edit which replaces the redirect with {{d}}.

(async () => {

// Setup. Don't add the button if the user already has permissions to delete the page immediately.
if (document.querySelector(".movepage-wrapper") && !document.querySelector("#wpLeaveRedirect")) {
	let firstCheckbox = document.querySelector(".movepage-wrapper .oo-ui-fieldLayout-align-inline");
	firstCheckbox.insertAdjacentHTML("afterEnd", `<div id="flag-delete-field" class="oo-ui-layout oo-ui-labelElement oo-ui-fieldLayout oo-ui-fieldLayout-align-inline"><div class="oo-ui-fieldLayout-body"><span class="oo-ui-fieldLayout-field"><span id="flag-delete" class="oo-ui-widget oo-ui-widget-enabled oo-ui-inputWidget oo-ui-checkboxInputWidget"><input type="checkbox" tabindex="0" id="flag-delete-checkbox" class="oo-ui-inputWidget-input"><span class="oo-ui-checkboxInputWidget-checkIcon oo-ui-widget oo-ui-widget-enabled oo-ui-iconElement-icon oo-ui-icon-check oo-ui-iconElement oo-ui-labelElement-invisible oo-ui-iconWidget oo-ui-image-invert"></span></span></span><span class="oo-ui-fieldLayout-header"><label for="flag-delete-checkbox" class="oo-ui-labelElement-label">Flag the source page for deletion</label></span></div></div>`);
	
	let flagDeleteCheckbox = document.querySelector("#flag-delete-checkbox");
	let submitButton = document.querySelector(".movepage-wrapper button");

	submitButton.addEventListener("click", () => {
		if (flagDeleteCheckbox.checked) {
			let oldPageTitle = document.querySelector(`[name="wpOldTitle"]`).value;
			localStorage.setItem("flagDelete", oldPageTitle);
		}
	});
}

// Make the edit after the move has completed.
let sourcePageElem = document.querySelector("#movepage-oldlink");
let pageToFlagDelete = localStorage.getItem("flagDelete");

if (pageToFlagDelete && sourcePageElem && sourcePageElem.textContent === localStorage.getItem("flagDelete")) {
	localStorage.removeItem("flagDelete");

	let actionAPI = new mw.Api({ajax: {headers: { "Api-User-Agent": "Gadget developed by [[User:Ioaxxere]]"}}});
	let targetPage = document.querySelector("#movepage-newlink").textContent;
	let reason = "(no reason provided)";
	let pageExists = false;
	let ns = (new mw.Title(pageToFlagDelete)).namespace;

	// 1. Make sure the moved page still exists (sometimes it gets deleted immediately)
	let pageExistsQuery = await actionAPI.get({action: "query", titles: pageToFlagDelete, format: "json"});

	if (pageExistsQuery.query.pages[-1] === undefined) {
		pageExists = true;

		// 2. Find out the edit summary through the logevents API.
		let moveLogResponse = await actionAPI.get({
			action: "query",
			letitle: pageToFlagDelete,
			list: "logevents",
			letype: "move",
			format: "json"
		});

		if (moveLogResponse.query.logevents[0] && moveLogResponse.query.logevents[0].comment)
			reason = moveLogResponse.query.logevents[0].comment;

		try {
			// 3. Make the edit.
			await actionAPI.postWithToken("csrf", {
				action: "edit",
				title: pageToFlagDelete,
				summary: "Flagging for deletion after moving the page to [[:" + targetPage + "]]: " + reason + " ([[MediaWiki:Gadget-FlagMovedPageForDeletion.js|automated]])",
				text: "{{d|Page moved to [[:" + targetPage + "]]: " + reason + "}}"
			});
		} catch (e) {
			// 4. If there's an error, try again on /documentation.
			if (ns === 8 || ns === 9 || ns === 10 || ns === 11 || ns === 828 || ns === 829) {
				await actionAPI.postWithToken("csrf", {
					action: "edit",
					title: pageToFlagDelete + "/documentation",
					summary: "Flagging for deletion after moving the page to [[:" + targetPage + "]]: " + reason + " ([[MediaWiki:Gadget-FlagMovedPageForDeletion.js|automated]])",
					text: "{{d|Page moved to [[:" + targetPage + "]]: " + reason + "}}"
				});
			}
		}
	}

	// 5. Display a message on success.
	let a = document.createElement("a");
	a.href = mw.util.getUrl(pageToFlagDelete);
	a.textContent = pageToFlagDelete;

	let message = document.createElement("span");
	message.append(a, pageExists ? " has been successfully flagged for deletion." : " has been deleted.");

	mw.notify(message);
}

})();
// </nowiki>