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kmfgaegmail.com / Ficbook downloader

// ==UserScript==
// @name         Ficbook downloader
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  Add epub download button for ficbook
// @author       xomq
// @match        https://ficbook.net/*
// @grant        none
// @license      MIT
// ==/UserScript==

(function () {
  function addEpubDownloadButton(elem, url) {
    let re = new RegExp(/readfic\/([0-9A-z-]*)/);
    let download_url = url.replace(re, 'fanfic_download/$1/epub');

    let btn = document.createElement("a");
    btn.classList.add("btn", "btn-primary", "btn-with-description");
    btn.href = download_url;

    let txt_elem = document.createElement("span");
    txt_elem.classList.add("description");
    txt_elem.innerHTML = "⭳ Epub";

    btn.appendChild(txt_elem);
    elem.appendChild(btn);
  }

  let loc = document.location.href;
  if (loc.includes("ficbook.net/readfic")) {
    /* fic page */
    let actions_container = document.getElementsByClassName("hat-actions-container hidden-xs")[0];
    if (actions_container != undefined) {
      let button_container = actions_container.children[0];
      addEpubDownloadButton(button_container, document.location.href);
    }
  }
  else {
    /* any page with fic list */
    let fic_list = document.querySelectorAll("article.fanfic-inline");
    fic_list.forEach(function (e) {
    	let link_elem = e.getElementsByClassName("visit-link")[0];
    	if (link_elem !== undefined) {
    		let item_header = e.getElementsByTagName("h3")[0];
    		addEpubDownloadButton(item_header, link_elem.href);
    	}
    });
  }
})();