User:Splarka/fetchredirects.js

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/* Fetch redirects to a page, version [0.0.3]
Originally from: http://en.wikipedia.org/wiki/User:Splarka/fetchredirects.js
*/

var frBaseURL = wgScriptPath + '/api.php?format=json&maxage=3600&smaxage=3600&rawcontinue=&callback=fetchRedirectsCB&action=query&list=backlinks&blfilterredir=redirects&bllimit=500';
if(wgNamespaceNumber > -1) addOnloadHook(function() {
  mw.util.addPortletLink('p-tb','javascript:fetchRedirects();','Get redirects','t-getredirects','Get a list of pages redirecting to this one');
})

function fetchRedirects() {
  var bar = document.getElementById('contentSub') || document.getElementById('topbar');
  if(!bar) return;
  var div = document.createElement('div');
  div.setAttribute('id','fr-out');
  bar.appendChild(div);
  injectSpinner(div,'fr');
  var url = frBaseURL + '&bltitle=' + encodeURIComponent(wgTitle);
  mw.loader.load(url);
  appendCSS('#t-getredirects {display:none;} #fr-out {border:1px solid #777777;padding:.5em;}');
}

function fetchRedirectsCB(obj) {
  var fr = document.getElementById('fr-out');
  if(!obj['query'] || !obj['query']['backlinks']) {
    fr.appendChild(document.createTextNode('Api error'));
    if(obj['error']) fr.appendChild(document.createTextNode(' - ' + obj['error']['code'] + ' - ' + obj['error']['info']));
    removeSpinner('fr');
    return;
  }
  var bl = obj['query']['backlinks'];
  if(bl.length == 0) {
    fr.appendChild(document.createTextNode('There are no redirects to this page.'));
    removeSpinner('fr');
    return;
  }
  fr.appendChild(document.createTextNode('Found redirects:'));
  fr.appendChild(document.createElement('br'));
 
  for(var i=0;i<bl.length;i++) {
    var title = encodeURIComponent(bl[i]['title']);
    fr.appendChild(document.createTextNode('('));
    addLinkChild(fr,wgScript + '?title=' + title + '&action=history','hist');
    fr.appendChild(document.createTextNode(' | '));
    addLinkChild(fr,wgScript + '?title=' + title + '&action=edit','edit');
    fr.appendChild(document.createTextNode(') '));
    addLinkChild(fr,wgScript + '?title=' + title + '&redirect=no',bl[i]['title'],false,'fr-result','Redirect to ' + wgTitle);
    fr.appendChild(document.createElement('br'));
  }
  if(obj['query-continue']) {
    var url = frBaseURL + '&bltitle=' + encodeURIComponent(wgTitle) + '&blcontinue=' + obj['query-continue']['backlinks']['blcontinue'];
    mw.loader.load(url);
  } else {
    removeSpinner('fr');
  }
}

function addLinkChild(obj,href,text,id,classes,title) {
  if(!obj || !href || !text) return false;
  var a = document.createElement('a');
  a.setAttribute('href',href);
  a.appendChild(document.createTextNode(text));
  if(id) a.setAttribute('id',id);
  if(classes) a.setAttribute('class',classes);
  if(title) a.setAttribute('title',title);
  obj.appendChild(a);
  return a;
}