Workflowy Strikethrough script

wfst.user.js

// ==UserScript==
// @name         Workflowy Strikethrough script
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Adds a style to the page for Strikethrough text, and sets any items with the tag #st to use that style
// @author       Michael Durland
// @match        https://workflowy.com/*
// @grant        none
// @require      http://code.jquery.com/jquery-3.4.1.min.js
// ==/UserScript==

(function() {
    'use strict';
    var j = jQuery.noConflict();
    // Add a style to the document for strikethrough formatting.
    var class_strikethrough = '' +
        '.strikethrough { ' +
        'color: #ccc !important; ' +
        'text-decoration: line-through !important; ' +
        '}';
    j("<style>")
        .prop("type", "text/css")
        .html(class_strikethrough)
        .appendTo("head");
    // Define a function to add the strikethrough formatting class to all parents of nodes with the #st tag.
    function update_strikethroughs() {
        // Need to remove first in case the #st tag was removed.
        j('.strikethrough').removeClass("strikethrough");
        // Need to add the class to the parent of the #st tag so that the entire item gets the strikethrough formatting.
        j('.contentTag[title="Filter #st"]').parents("div.content").addClass("strikethrough");
    };
    // Set a periodic timer to update the styles.
    setInterval(update_strikethroughs, 200);
    // Setup a keyboard shortcut of "Alt -" to toggle strikethrough on the current node.
    window.addEventListener('keydown', function(e) {
        let is_minus_key = (e.key == '-');
        if (is_minus_key && e.altKey) {
            WF.save(); // need to save first. Otherwise the API might return stale data.
            var current_item = WF.focusedItem();
            if (current_item) {
                var item_text = current_item.getName();
                if (item_text) {
                    let is_strikethrough = item_text.includes("#st");
                    if (is_strikethrough) {
                        // Remove the tag.
                        item_text = item_text.replace("#st", "").trim();
                    }
                    else {
                        // Add the tag.
                        item_text = item_text + " #st";
                    }
                    // Strip off whitespace. This is needed if the #st tag is removed.
                    // Otherwise the string is left with a leading space if the tag was at
                    // the front of the string, or a trailing space if the tag was at
                    // the end of the string.
                    WF.setItemName(current_item, item_text);
                }
            }
        }
    }, true);
})();