User:Ais523/catwatch.js

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/* Category watch ([[User:ais523/catwatch.js]]); adds entries on the watchlist if a page is added to a category
   (and is still in the category when the watchlist is checked). The entry will only appear if there is another
   page on the watchlist edited that day (if the addition was the only change on that day, it's neglected). The
   recategorisation of a page in a watched category will also trigger the watching, even if it's a different
   category that's added or removed (unless the watched category is removed); removals from the watched category
   can't be detected. Categories with more than 100 elements won't be watched for server-load reasons. */

//<pre><nowiki>

var cwwpajax;
// From [[WP:US]] mainpage (wpajax renamed to cwwpajax)
cwwpajax={
        download:function(bundle) {
                // mandatory: bundle.url
                // optional:  bundle.onSuccess (xmlhttprequest, bundle)
                // optional:  bundle.onFailure (xmlhttprequest, bundle)
                // optional:  bundle.otherStuff OK too, passed to onSuccess and onFailure
                
                var x = window.XMLHttpRequest ? new XMLHttpRequest()
                : window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP")
                : false;
                
                if (x) {
                        x.onreadystatechange=function() {
                                x.readyState==4 && cwwpajax.downloadComplete(x,bundle);
                        };
                        x.open("GET",bundle.url,true);
                        x.send(null); 
                }
                return x;
        },

        downloadComplete:function(x,bundle) {
                x.status==200 && ( bundle.onSuccess && bundle.onSuccess(x,bundle) || true )
                || ( bundle.onFailure && bundle.onFailure(x,bundle) || alert(x.statusText));
        }
};

// Example:
// function dlComplete(xmlreq, data) {
//      alert(data.message + xmlreq.responseText);
// }
//  cwwpajax.download({url:'http://en.wikipedia.org/w/index.php?title=Thresher&action=raw', 
//                   onSuccess: dlComplete, message: "Here's what we got:\n\n" });

// End of [[WP:US]] quote

function cwOntoWatchlist(xmlreq, data)
{
  var a=xmlreq.responseText;
  var c=data.catname;
  var i;
  if(a.indexOf("<error>")!=-1) return; //cat is empty, nothing to do here
  if(a.indexOf("<category next=")!=-1) return; //cat has more than 100 elements, so the results will be misleading
  a=a.split("<timestamp>");
  var latesttime=0;
  var latestpage="";
  var temp, temp2;
  for(i in a)
  {
    temp=a[i].indexOf("</timestamp>");
    if(temp!=-1)
    {
      temp=new Number(a[i].substr(0,temp));
      if(temp>latesttime)
      {
        latesttime=temp;
        a[i]=a[i].substr(a[i].indexOf("<title>")+7);
        latestpage=a[i].substr(0,a[i].indexOf("</title>"));
      }
    }
  }
  a=document.getElementsByTagName("h4"); //get dates in the watchlist
  var monthname=new Array();
  monthname['01']="January";
  monthname['02']="February";
  monthname['03']="March";
  monthname['04']="April";
  monthname['05']="May";
  monthname['06']="June";
  monthname['07']="July";
  monthname['08']="August";
  monthname['09']="September";
  monthname['10']="October";
  monthname['11']="November";
  monthname['12']="December";
  latesttime=new String(latesttime);
  temp=""+new Number(latesttime.substr(6,2))+" "+monthname[latesttime.substr(4,2)]+" "+latesttime.substr(0,4);

  i=a.length;
  while(i--)
  {
    if(a[i].innerHTML==temp)
    {
      temp=a[i].nextSibling.firstChild;
      while(temp!=null)
      {
        if(temp.tagName!=null)
        if(temp.tagName.toLowerCase()=="li")
        {
          temp2=temp.innerHTML.match(/; ([0-9][0-9]):([0-9][0-9]) \. \./);
          temp2=new Number(temp2[1])*100+new Number(temp2[2]);
          if(temp2<new Number(latesttime.substr(8,4))) {temp2=temp; break;}
        }
        temp2=temp; temp=temp.nextSibling;
        if(temp==null) break;
      }
      temp=document.createElement("li");
      a[i].nextSibling.insertBefore(temp,temp2);
      temp.innerHTML="(diff) (hist) . . <a href='http://en.wikipedia.org/wiki/Category:"+encodeURI(c)+
                     "'>Category:"+c+"</a>; "+latesttime.substr(8,2)+":"+latesttime.substr(10,2)+" . . (+ "+
                     "<a href='http://en.wikipedia.org/wiki/"+encodeURI(latestpage)+"'>"+latestpage+"</a> "+
                     "(<a href='http://en.wikipedia.org/w/index.php?title="+encodeURI(latestpage)+
                     "&diff=last'>last</a>))";
      return;
    }
  }
}

var WatchedCategories; //prevent error if there isn't a cat-watchlist yet

//An example of a query to check a category would be
//http://en.wikipedia.org/w/query.php?what=category&cptitle=Wikipedia%20protected%20edit%20requests&cplimit=100&cpextended
addOnloadHook(function(){
  if(wgPageName=="Special:Watchlist")
  {
    if(WatchedCategories==undefined)
    {
      if(confirm("You don't have a category watchlist yet. Do you want to create one?"))
        location.href='http://en.wikipedia.org/w/index.php?title=User:'+wgUserName+
                      '/WatchedCategories.js&action=edit&preload=User:Ais523/WatchedCategoriesTemplate.js';
    }
    else
    {
      var i;
      for(i in WatchedCategories)
      {
        var a=WatchedCategories[i];
        cwwpajax.download({url:'http://en.wikipedia.org/w/query.php?what=category&cptitle='+encodeURI(a)+
                               '&cplimit=100&cpextended&format=xml', onSuccess:cwOntoWatchlist, catname:a});
      }
    }
  }
});

// include current user's category watchlist
document.write('<script type="text/javascript" src="http://en.wikipedia.org'
             + '/w/index.php?title=User:'+wgUserName+'/WatchedCategories.js' 
             + '&action=raw&ctype=text/javascript&dontcountme=s"></script>');
//</nowiki></pre>
//[[Category:Wikipedia scripts]]