Tampermonkey script to add 'view post source' button to Discourse forum posts

view_post_source.js

// ==UserScript==
// @name         Discourse View Post Source
// @namespace    jholbrook
// @author       John Holbrook
// @version      0.1
// @description  Adds a 'view post source' button to posts on Discourse forums
// @website      https://gist.github.com/dhmmjoph/77edfd56cd54e65acbd4877e3154458a

//Change these or add aditional sites here:
// @match        https://www.vexforum.com/t/*
// @match        http://www.vexforum.com/t/*

// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Get the current thread ID
    var this_page_url_contents = window.location.href.split('/');
    var this_thread_id = this_page_url_contents[5];

    // Get all the post objects
    var all_posts = document.getElementsByClassName("topic-post");

    // For each post...
    for (var i=0; i<all_posts.length; i++){
        // Find the area with the controls at the bottom of the post
        let actions_div = all_posts[i].getElementsByTagName("article")[0].
            getElementsByClassName("row")[0].
            getElementsByClassName("topic-body")[0].
            getElementsByClassName("contents")[0].
            getElementsByClassName("post-menu-area")[0].
            getElementsByClassName("post-controls")[0].
            getElementsByClassName("actions")[0];

        //console.log(actions_div);

        // Build the URL of the raw post text
        var source_url = "https://www.vexforum.com/raw/" + this_thread_id + "/" + (i+1);

        // Construct the new button and add it to the row of existing buttons
        var new_button_html = "<div class=\"double-button\" aria-label=\"View post source\" style=\"font-family:\'Lucida Console\', Monaco, monospace; font-size=1.5em;\" text=\"View Post Source\">";
        new_button_html += "<a target=\"_blank\" href=\"" + source_url + "\">";
        new_button_html += "&lt;&#47;&gt;";
        new_button_html += "</a></div>"
        actions_div.innerHTML = new_button_html + actions_div.innerHTML;

    }
})();