Plonking userscript for Linuxfr.org

DLFPlonk.user.js

// ==UserScript==
// @name        DLFPlonk
// @namespace   DLFPlonk
// @include     https://linuxfr.org/*
// @version     2
// @grant       GM_xmlhttpRequest
// @grant       GM_getValue
// @grant       GM_setValue
// @grant       GM_deleteValue
// @grant       GM_addStyle
// ==/UserScript==

//            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
//   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
//
//  0. You just DO WHAT THE FUCK YOU WANT TO.
//

(function() {
    let plonkList = GM_getValue("plonkList","").split(",");
    if(plonkList.length === 1 && plonkList[0] === ""){
      plonkList=[];
    }

    GM_addStyle(".overlaybg{position:fixed;top:0;left:0;width: 100%;height: 100%;background-color:#000; opacity:0.5;z-index:100}");
    GM_addStyle(".overlaywin{position:fixed;left:0;right:0;top:0;bottom:0;width:600px;height:300px;margin:auto;background-color:#FFF;z-index:101;padding:10px 20px;border:thick double #000}");
    GM_addStyle(".overlaywin select{width:100%;height:200px}");
    GM_addStyle(".overlaywin button{background-image:none;padding-left:5px}");
    GM_addStyle(".overlaywin button[disabled='disabled']{background-image:none;padding-left:5px;color:gray}");

    function closePlonkList(){
      document.getElementsByClassName("overlaywin").item(0).remove();
      document.getElementsByClassName("overlaybg").item(0).remove();
      location.reload();
    }

    function buildForm(form,user){
      let p = document.createElement("p");
      let select = document.createElement("select");
      if(plonkList.length){
        p.appendChild(document.createTextNode("Liste des utilisateurs plonkés:"));
        select.setAttribute("id","plonkList");
        select.setAttribute("multiple","multiple");
        for (let i = 0; i < plonkList.length; i++){
          let option = document.createElement("option");
          option.setAttribute("value",plonkList[i]);
          option.appendChild(document.createTextNode(plonkList[i]));
          select.appendChild(option);
        }
      }else{
        p.appendChild(document.createTextNode("Aucun utilisateur plonké pour le moment."));
        select.remove();
        select=null;
      }
      form.appendChild(p);
      if(select){
        form.appendChild(select);
      }

      let addButton = document.createElement("button");
      addButton.setAttribute("id","plonkAdd");
      addButton.appendChild(document.createTextNode("Plonker '"+user+"'"));
      addButton.addEventListener("click",function(){plonk(plonkList,user);},true);
      if(plonkList.indexOf(user) !== -1){
        addButton.setAttribute("disabled","disabled");
      }
      form.appendChild(addButton);

      let delButton = document.createElement("button");
      delButton.appendChild(document.createTextNode("Supprimer la sélection"));
      delButton.addEventListener("click",function(){unplonk(plonkList,user);},true);
      if(!plonkList.length){
        delButton.setAttribute("disabled","disabled");
      }
      form.appendChild(delButton);

      let cancelButton = document.createElement("button");
      cancelButton.appendChild(document.createTextNode("Valider"));
      cancelButton.addEventListener("click",function(){closePlonkList();},true);
      form.appendChild(cancelButton);
    }

    function plonk(plonkList,user){
      plonkList.push(user);
      GM_setValue("plonkList",plonkList.join(","));
      let select = document.getElementById("plonkList");
      if(!select){
        let form = document.getElementById("plonkForm");
        form.remove();
        form = document.createElement("form");
        form.setAttribute("id","plonkForm");
        buildForm(form,user);
        document.getElementsByClassName("overlaywin").item(0).appendChild(form);
      }else{
        let option = document.createElement("option");
        option.setAttribute("value",user);
        option.appendChild(document.createTextNode(user));
        option.setAttribute("selected","selected");
        select.appendChild(option);
      }
    }

    function unplonk(plonkList,user){
      select = document.getElementById("plonkList");
      for (let i = 0; i < select.length; i++){
        if(!select[i].selected){
          continue;
        }
        plonkList.splice(plonkList.indexOf(select[i]),1);
        select[i].remove();
      }
      if(plonkList.length === 1 && plonkList[0] === ""){
        plonkList=[];
      }
      if(!plonkList.length){
        let form = document.getElementById("plonkForm");
        form.remove();
        form = document.createElement("form");
        form.setAttribute("id","plonkForm");
        buildForm(form,user);
        document.getElementsByClassName("overlaywin").item(0).appendChild(form);
      }

      GM_setValue("plonkList",plonkList.join(","));
    }

    function addToPlonkList(plonkList,user){
      let bg = document.createElement("div");
      bg.className = "overlaybg";
      document.body.appendChild(bg);
      let win = document.createElement("div");
      win.className = "overlaywin";
      let form = document.createElement("form");
      form.setAttribute("id","plonkForm");
      buildForm(form,user);
      win.appendChild(form);
      document.body.appendChild(win);
      return false;
    }

    let articles = document.getElementsByTagName('article');
    for (let i = 0; i < articles.length; i++) {
      let userLink = articles[i].getElementsByClassName('meta').item(0).getElementsByTagName('a').item(0);
      let span = document.createElement("span");
      let sup = document.createElement("sup");
      let a = document.createElement("a");
      let txt = document.createTextNode(" Plonk");
      a.appendChild(txt);
      a.addEventListener("click",function(){addToPlonkList(plonkList,userLink.textContent);},true);
      a.href="#";
      sup.appendChild(a);
      span.appendChild(sup);
      userLink.parentNode.insertBefore(span,userLink.nextSibling);
      GM_xmlhttpRequest({
          method: "GET",
          url: userLink.href,
          context: articles[i],
          onload: function(response) {
            if(response.responseText.match(/Compte fermé/)){
              response.context.style.display="none";
            }
          }
      });
      for(let j = 0; j < plonkList.length; j++){
        if (userLink.textContent === plonkList[j] || userLink.href === "https://linuxfr.org/users/"+plonkList[j]){
          articles[i].style.display = "none";
          break;
        }
      }
    }
})();