User:Tollens/longCommenter.js

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/*
    To use this script, add the following line to your Special:MyPage/common.js:

    importScript("User:Tollens/longCommenter.js"); // Backlink: [[User:Tollens/longCommenter.js]]

    The button will be placed in the same dropdown menu as the "Move" button,
    which depending on the skin used could be called "More" or "Tools". It will
    only appear on article pages, and will not tag any page that is already
    256 bytes or larger.
*/


//<nowiki>
if (sessionStorage.getItem("justAddedLongComment") === "true") {
    mw.notify("Long comment tag added successfully", { type: "success" });
    sessionStorage.removeItem("justAddedLongComment");
}

$.when(mw.loader.using(["mediawiki.util"]), $.ready).done(function () {
    if (mw.config.get("wgNamespaceNumber") !== 0) return;

    const api = new mw.Api();
    const currentPage = mw.config.get("wgPageName");

    let button = mw.util.addPortletLink(
        "p-cactions",
        "#",
        "Add long comment tag",
        "ca-add-longcomment",
        "Add long comment tag to this page"
    );

    if (button) {
        button.addEventListener("click", async function () {
            const length = Object.values(
                (
                    await api.post({
                        action: "query",
                        prop: "revisions",
                        titles: currentPage,
                        rvprop: "size"
                    })
                ).query.pages
            )[0].revisions[0].size;

            if (length >= 256) {
                mw.notify(`Page too long (${length} bytes), will not tag`, { type: "warn" });
                return;
            }

            await api.postWithToken("csrf", {
                action: "edit",
                title: currentPage,
                summary: "Adding long comment tag to prevent legitimately short page from listing at [[Special:ShortPages]] (via [[User:Tollens/longCommenter.js|script]])",
                appendtext: "\n{{subst:long comment}}"
            });

            sessionStorage.setItem("justAddedLongComment", "true");

            window.location.reload();
        });
    }
});
//</nowiki>