var histComb = new function(){
 
if (!window.histCombTalk) histCombTalk = 't'
if (!window.histCombContrib) histCombContrib = 'c'
if (!window.histCombMyBg) histCombMyBg = '#F0FFF0'
 
var pagehis,  histRow, histSize, isCombEdits = false
 
 
this.onLoad = function(){
 
 pagehis = document.getElementById('pagehistory') 
 if (!pagehis) return
 histRow = pagehis.getElementsByTagName('li')
 histSize = new Array (histRow.length)
 var row, spans, i, aa, author, author_p = '', size_digits  
 var sameAuthor = 0, thisMinor, allMinor = true
 
 for (var rr=histRow.length-1; rr>=0; rr--){ //main loop: all rows bottom to top
  row = histRow[rr]
  thisMinor = false
  spans = row.getElementsByTagName('span')
  //check all spans
  for (i=0; i<spans.length; i++)
    switch (spans[i].className){
    case 'history-size':
      size_digits = spans[i].innerHTML.match(/\d+/g)
      histSize[rr] = size_digits ? size_digits.join('') : '0'
      if (histSize[rr+1]){ 
        spans[i].title = spans[i].innerHTML.replace(/&nbsp;/g,' ')
        insertDiffValue(spans[i], histSize[rr] - histSize[rr+1])
      }
      break
    case 'minor':
      thisMinor = true
      break
    case 'history-user': // get user name and shorten talk/contribs
      aa = spans[i].getElementsByTagName('a')
      author = aa[1].title.split(':')[1]
      aa[1].innerHTML = histCombTalk 
      if (aa.length >= 3 && (aa[2].title.indexOf(':Contributions/') != -1)) //for anons this could be 'block'
        aa[2].innerHTML = histCombContrib 
      break
    case 'mw-history-undo':
      aa = spans[i].getElementsByTagName('a')[0]
      aa.title = aa.innerHTML 
      aa.innerHTML = '×'
      break
    //case 'comment':  histSumm = spans[i].innerHTML  break 
    }//end switch inside for 
 
    if (!histSize[rr] && histSize[rr+1]) histSize[rr] = histSize[rr+1] //assume it was '(un)protect' edit
 
  if (wgUserName == author) histRow[rr].style.backgroundColor = histCombMyBg
  //check how many consequent edits
  if (author == author_p) 
    sameAuthor++
  else {
    if (sameAuthor > 1) createCombineEdit(rr+1, sameAuthor, allMinor)
    sameAuthor = 1 
    author_p = author
    allMinor = thisMinor
  }
  if (!thisMinor) allMinor = false
 }//main loop
 
 //collapse top editor too
 if (sameAuthor>1) {
   createCombineEdit(0, sameAuthor, allMinor)
   if (histRow.length > sameAuthor && !window.histCombNoCollapse) //if collapsing top row - make  next row selected
     histRow[sameAuthor].getElementsByTagName('input')[0].click()
 }
 
 //add  "expand/collapse all" link
 if (isCombEdits) { 
   var togAll = document.createElement('a')
   togAll.appendChild(document.createTextNode('[±]'))
   togAll.href = 'javascript:histComb.toggleAll()'
   pagehis.parentNode.insertBefore(togAll, pagehis.previousSibling)   
 }
 
 
 //bonus: link to toоlserver
 var lnk = document.createElement('a')
 lnk.style.marginLeft = '20px'
 lnk.href = 'http://tools.wikimedia.de/~daniel/WikiSense/Contributors.php?'
  +'wikilang='+wgServer.substring(wgServer.lastIndexOf('/')+1, wgServer.indexOf('.'))
  +'&wikifam='+wgServer.substring(wgServer.indexOf('.'))
  +'&grouped=on&order=-edit_count&page='+encodeURIComponent(mw.config.get('wgPageName'))
 lnk.appendChild(document.createTextNode('Contributors'))
 lnk.title = 'All authors sorted by edits (on toolserver)'
 if (i=document.getElementById('contentSub')) i.appendChild(lnk)
 
 
}
 
 
this.toggleAll = function(){
 var links = getElementsByClassName(pagehis, 'a', 'collapsedEdits')
 var state = (links[0].innerHTML == '[–]')
 for (var i=0; i<links.length; i++)
   if (state == (links[i].innerHTML == '[–]'))
     eval(links[i].href)
}
 
 
this.toggle = function (m, len, isMinor){ //handler for collapsing link
 var row = histRow[m]
 var spans = row.getElementsByTagName('span')
 var plus = row.lastChild
 var radios = row.getElementsByTagName('input')
 var topDiff = row.getElementsByTagName('a')[ m > 0 ? 1 : 0] // "diff to last" in the combined edit
 var i, clss, bottomDiff, oldid
 var isHiding = (plus.innerHTML == '[–]')
 if (isHiding) {//need to collapse −
   plus.innerHTML = '[' + len + ']'
   row.style.borderLeft = '1px solid transparent'
   //hide other rows
   for (i=m+1; i<m+len; i++) histRow[i].style.display = 'none'
   //"diff from last" link: get oldid from the lowest collapsed edit
   bottomDiff = histRow[m+len-1].getElementsByTagName('a')[1].href
   if (bottomDiff.indexOf('&diff=') == -1)  topDiff.style.visibility = 'hidden' //the very 1st edit
   oldid = bottomDiff.match(/oldid=(\d+)/)[1]
   topDiff['old'] = topDiff.href
   topDiff.href = topDiff.href.replace(/&oldid=\d+/, '&oldid='+oldid)
 }else{ //need to expand
   plus.innerHTML = '[–]'
   //show other rows and visually reference the whole group
   row.style.borderLeft = '1px dotted gray'
   for (i=m+1; i<m+len; i++){
     histRow[i].style.display = 'block'
     histRow[i].style.borderLeft = '1px dotted gray'
     histRow[i].style.listStyle = 'none none'
   }
   histRow[m+len-1].style.borderBottom = '1px dotted gray'
   topDiff.href = topDiff['old']
   topDiff.style.visibility = 'visible'
 }
 //hide/show/modify spans in this row
 for (i=0; i<spans.length; i++)
   switch (spans[i].className.split(' ')[0]){
   case 'minor':
     spans[i].style.display = (isHiding && !isMinor)?'none':'inline'
     break
   case 'history-size': //switch to  combined diff size and back
     insertDiffValue(spans[i], histSize[m] - (isHiding ? histSize[m+len] : histSize[m+1]))
     break
   case 'comment': //hide/show
     spans[i].style.display = (isHiding && !window.histCombLeaveComment)?'none':'inline'
     break
   case 'mw-history-undo':
     var undoLnk = spans[i].getElementsByTagName('a')[0]
     if (isHiding) {
       undoLnk['old'] = undoLnk.href
       undoLnk.href = undoLnk.href.replace(/&undoafter=\d+/, '&undoafter='+oldid)
     }else
       undoLnk.href = undoLnk['old']
     break
   //case 'history-user':
 }
}
 
 
function createCombineEdit(m, len, isMinor){ //creates collapsing link for row m down to row m+len
 var row = histRow[m]
 row.style.listStyle = 'none none'
 row.style.position = 'relative'
 var plus = document.createElement('a')
 plus.className = 'collapsedEdits'
 plus.appendChild(document.createTextNode('[–]'))
 plus.style.position = 'absolute'
 plus.style.left = '-22px'
 plus.style.top = '2px'
 plus.href = 'javascript:histComb.toggle('+m+','+len+','+isMinor+')'
 row.appendChild(plus)
 if (!window.histCombNoCollapse) histComb.toggle(m, len, isMinor) //and collapse
 isCombEdits = true
 
 //unexplained IE bug: in row just under collapsed edit  radios were jumping to the left, links were unclickable
 if (navigator.userAgent.indexOf('MSIE') != -1 && m+len < histRow.length){ //make all elements 'relative'
  var els = histRow[m+len].getElementsByTagName('*')
  for (i=0; i<els.length; i++)  
     if (els[i].style && !els[i].style.position) els[i].style.position = 'relative'
 }
}
 
 
function insertDiffValue(span, value){
 var html, class2
 if (value>0) {
  html = '(+' + value + ')'
  class2 = ' mw-plusminus-pos'
 } else if (value<0) {
  html = '(' + value + ')'
  class2 = ' mw-plusminus-neg'
 } else {
  html = '(0)'
  class2 = ' mw-plusminus-null'
 }
 span.style.fontWeight = (value < -500) ? 'bold' : 'normal'
 span.innerHTML = html
 span.className = span.className.split(' ')[0] + class2
}
 
}//obj
 
if (doneOnloadHook) histComb.onLoad()
else if (wgAction == 'history') addOnloadHook(histComb.onLoad)