User:Ais523/catwatch.js

/* 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.

   A previous version of this script had a limit on the maximum size of a category that could be
   watched; this limit no longer exists.
   
   Thanks to [[User:TheDJ]] for helping me make this compatible with more browsers and preference
   settings, and to Roan Kattouw for fixing [[bugzilla:11275]] and making this cheap on the servers.

   Note that some users have had problems installing this in Internet Explorer; if the second cachea
   bypass (after changing the category watchlist) doesn't work, deleting all your temporary
   Internet files seems to.
*/

//<source lang="javascript">

var cwwpajax;
// From [[WP:US]] mainpage (wpajax renamed to cwwpajax)
cwwpajax={
        download:function(bundle) {
                // mandatory: bundle.url
                // mandatory: bundle.async
                // 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() // Firefox, Safari, Opera, IE7
                : window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") // IE6
                : false;
                
                if (x) {
                        x.onreadystatechange=function() {
                                x.readyState==4 && cwwpajax.downloadComplete(x,bundle);
                        };
                        x.open("GET",bundle.url,bundle.async);
                        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;
  var diag="";
  if(a.indexOf("<categorymembers/>")!=-1) return; //cat is empty, nothing to do here
  if(a.indexOf('title="')==-1) return; // this error happens sometimes, just do nothing here
  var latesttime=0;
  var latestpage="";
  var temp, temp2;
  latestpage=a.split('title="')[1].split('" timestamp=')[0];
  latesttime=a.split('timestamp="')[1].split('"/>')[0];
  a=document.getElementsByTagName("h4"); //get dates in the watchlist
  var monthname=[];
  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);
  
  var mn1, mn2, mn3, mn4;
  
  // Allow for different date styles:
  // January 29, 2001
  mn1=""+monthname[latesttime.substr(5,2)]+" "+new Number(latesttime.substr(8,2))+
      ", "+latesttime.substr(0,4);
  // 29 January 2001
  mn2=""+new Number(latesttime.substr(8,2))+" "+monthname[latesttime.substr(5,2)]+
      " "+latesttime.substr(0,4);
  // 2001 January 29
  mn3=""+latesttime.substr(0,4)+" "+monthname[latesttime.substr(5,2)]+
      " "+new Number(latesttime.substr(8,2));
  // 2001-01-29
  mn4=""+latesttime.substr(0,4)+"-"+latesttime.substr(5,2)+"-"+latesttime.substr(8,2);

  i=a.length;
  while(i--)
  {
    if(a[i].innerHTML==mn1||a[i].innerHTML==mn2||a[i].innerHTML==mn3||a[i].innerHTML==mn4)
    {
      diag+=a[i].innerHTML+":";
      temp=a[i].nextSibling.firstChild;
      if(temp==null) temp=a[i].nextSibling.nextSibling.firstChild;
      while(temp!=null)
      {
        diag+=temp.tagname+"!";
        if(temp.tagName!=null)
        if(temp.tagName.toLowerCase()=="li")
        {
          temp2=temp.innerHTML.match(/<span class="mw-changeslist-date">([0-9][0-9]):([0-9][0-9])(:[0-9][0-9])?<\/span>/i) || [];
          temp2=new Number(temp2[1])*100+new Number(temp2[2]);
          diag+=temp2+",";
          if(temp2<new Number(latesttime.substr(11,2)+latesttime.substr(14,2))) {temp2=temp; break;}
        }
        temp2=temp; temp=temp.nextSibling;
        if(temp==null) break;
      }
      temp=document.createElement("li");
      if(temp2==null) {return;}
      if(a[i].nextSibling.firstChild!==null) // IE-like whitespace handling
        a[i].nextSibling.insertBefore(temp,temp2);
      else // Firefox-like whitespace handling
        a[i].nextSibling.nextSibling.insertBefore(temp,temp2);

      temp.innerHTML="(diff | hist) . . <a "+
                     "href='"+mw.config.get('wgScriptPath')+"/index.php?title=Category:"+
                     encodeURI(c)+
                     "'>Category:"+c+"</a>; "+latesttime.substr(11,2)+":"+latesttime.substr(14,2)+
                     " . . (+ <a "+
                     "href='"+mw.config.get('wgScriptPath')+'/index.php?title='+
                     encodeURI(latestpage)+"'>"+latestpage+"</a> "+
                     "(<a href='"+mw.config.get('wgScriptPath')+"/index.php?title="+encodeURI(latestpage)+
                     "&diff=last'>last</a>))";
      return;
    }
  }
}

var WatchedCategories;

//An example of a query to check a category would be

//http://en.wikipedia.org/w/api.php?action=query&list=categorymembers&cmcategory=Wikipedia%20protected%20edit%20requests&cmlimit=1&cmprop=title|timestamp&cmsort=timestamp&cmdir=desc&format=xml
$(function(){
  var scriptPath = mw.config.get('wgScriptPath');
  //DHTMLloadscript( 'http://en.wikipedia.org/w/index.php?title=User:'+mw.config.get('wgUserName')
  //  +'/WatchedCategories.js&action=raw&ctype=text/javascript');
  if(mw.config.get('wgPageName')=="Special:Watchlist")
  {
    // load the script using AJAX, because DHTML fails in Firefox and document.write fails in Safari
    var sru=scriptPath+'/index.php?title=User:'+mw.config.get('wgUserName')+'/WatchedCategories.js&action=raw&ctype=text/javascript';
    var sr=cwwpajax.download({url:sru,async:false});
    eval(sr.responseText);
    if(WatchedCategories===undefined)
    {
      if(confirm("You don't have a category watchlist yet. Do you want to create one?\n\n"+
                 "(Please provide the following debug information when reporting a problem if "+
                 "this message comes up when you already have a category watchlist: "+
                 (sr.responseText.length<50 ? "responseText='"+sr.responseText+"'" :
                 "responseText.length="+sr.responseText.length)+", statusText='"+sr.statusText
                 +"'.)"))
        location.href=scriptPath+'/index.php?title=User:'+mw.config.get('wgUserName')+
        '/WatchedCategories.js&action=edit&preload=User:Ais523/WatchedCategoriesTemplate.js';
    }
    else
    {
      var i;
      for(i=0; i<WatchedCategories.length; i++)
      {
        var a=WatchedCategories[i];
        cwwpajax.download({url:scriptPath+'/api.php?action=query&list=categorymembers&'
                           +'cmtitle=Category:'+encodeURI(a)+'&cmlimit=1&cmprop=title'
                           +'|timestamp&cmsort=timestamp&cmdir=desc&format=xml',
                           onSuccess:cwOntoWatchlist,
                           catname:a, async:true});
      }
    }
  }
});

//</source>
//<!--[[Category:Wikipedia scripts]]-->