User:Rummskartoffel/generate pings.js

Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.

$(() => {
    const portlet_link = mw.util.addPortletLink("p-tb", "#", "Generate pings");
    $(portlet_link).on("click", () => {
        const api = new mw.Api();
        api.get({
            action: "query",
            format: "json",
            list: "categorymembers",
            cmtitle: mw.config.get("wgPageName"),
            cmnamespace: "2",
            cmlimit: "100",
            formatversion: "2",
        })
        .then(response =>
            [...new Set(response.query.categorymembers
                .map(entry => entry.title.split("/")[0])
            )]
            .slice(0, 50)
            .map(entry => `[[${entry}]]`)
            .join(", ")
        )
        .then(wikitext => {
            if (wikitext.length) {
                try {
                    navigator.clipboard.writeText(wikitext)
                    .then(() => mw.notify("Wikitext copied to clipboard"))
                    .catch((...errors) => {
                        console.warn("navigator.clipboard.writeText rejected with", ...errors);
                        copy_to_clipboard_fallback(wikitext);
                    });
                } catch(error) {
                    console.warn("error when accessing navigator.clipboard.writeText", error);
                    copy_to_clipboard_fallback(wikitext);
                }
            } else {
                mw.notify(
                    "This category does not appear to contain any users. No wikitext was generated.",
                    {type: "warn"}
                );
            }
        })
        .catch((error_code, ...errors) => {
            if (error_code === "invalidcategory") {
                mw.notify(
                    "Error: The current page does not appear to be a valid category, unable to generate pings.",
                    {type: "error"}
                );
            } else {
                mw.notify("Error: An unknown error occured.", {type: "error"});
                console.error(error_code, ...errors);
            }
        });
    });

    function copy_to_clipboard_fallback(wikitext) {
        const input = $("<input>", {
            value: wikitext,
            type: "text",
            style: "position: fixed; top: -100em; left: -100em;"
        }).appendTo(document.body).select();
        document.execCommand("copy");
        input.remove();
        mw.notify(
            "Warning: Falling back to old method of clipboard access. Copying to clipboard may have failed.",
            {type: "warn"}
        );
    }
});