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+/* This script adds interactivity for wiki-history webpages.
+ *
+ * The main code is within the 'on-click' handler of the "diff" links.
+ * Instead of standard redirection it fills-in two hidden inputs with
+ * the appropriate values and submits the corresponding form.
+ * A special care should be taken if some intermediate edits are hidden.
+ *
+ * For the sake of compatibility with ascetic browsers the code tries
+ * to avoid modern API and ECMAScript constructs. This makes it less
+ * readable and may be reconsidered in the future.
+*/
+window.addEventListener( 'load', function() {
+
+var form = document.getElementById("wh-form");
+form.method = "GET";
+var csrf = form.querySelector("input[name='csrf']");
+if( csrf ) form.removeChild( csrf );
+
+var wh_id  = document.getElementById("wh-id" );
+var wh_pid = document.getElementById("wh-pid");
+var wh_cleaner = document.getElementById("wh-cleaner");
+var wh_collapser = document.getElementById("wh-collapser");
+
+var wh_radios   = [];  // user-visible controls for baseline selection
+var wh_hidden   =  0;  // current number of hidden (collapsed) rows
+var wh_selected = -1;  // index of the currently selected radio-button
+
+var wh_onRadio = function( event ){
+
+  var indx = event.target.indx;
+  if( wh_selected == indx ){
+
+    wh_selected  = -1;
+    event.target.checked = false;
+  }
+  else wh_selected = indx;
+}
+var wh_onDifflink = function( event ){
+
+  event.preventDefault();
+  var indx = event.target.indx;
+  wh_id.value = wh_radios[indx].value;
+
+  if( wh_hidden > 0 ){
+
+    var p = indx + 1;
+    if( wh_selected >= 0 ){
+
+       var tr = wh_radios[wh_selected].parentElement.parentElement;
+       if( ! tr.hidden )
+          p = wh_selected;
+    }
+    while( p < wh_radios.length ){
+
+      if( ! wh_radios[p].parentElement.parentElement.hidden )
+	     break;
+      p++;
+    }
+    if( p < wh_radios.length ){
+
+       wh_pid.value = wh_radios[p].value;
+       wh_pid.checked = true;
+    }
+    else {  // just render the wiki for the case of the first major edit
+
+      var path = document.location.pathname.split("/");
+      path.pop();
+      var newpath = path.join("/") + "/info/" + wh_radios[indx].value;
+      document.location = document.location.origin + newpath;
+      return;
+    }
+  }
+  else if( wh_selected >= 0 ) {
+
+     wh_pid.value = wh_radios[wh_selected].value;
+     wh_pid.checked = true;
+  }
+  else wh_pid.checked = false;
+
+  document.getElementById("wh-form").submit();
+}
+var wh_onCleaner = function() {
+
+   if( wh_selected >= 0 ) {
+
+      wh_radios[wh_selected].checked = false;
+      wh_selected = -1;
+   }
+}
+var wh_onCollapser = function( event ){
+
+  var collapsing = ( wh_hidden == 0 );
+  for( var k = 0; k < wh_radios.length; k++ ){
+
+    var radio = wh_radios[k];
+    var tr = radio.parentElement.parentElement;
+    if( tr.className == "wh-intermediate" ){
+
+	  if( tr.hidden = ! tr.hidden )
+	    wh_hidden++;
+	  else
+	    wh_hidden--;
+
+    } else if( radio.iterspan )
+               radio.iterspan.hidden = ! collapsing;
+  }
+  if( wh_hidden > 0 ) {
+
+    wh_collapser.title="Show intermediate edits";
+    wh_collapser.innerHTML = "&emsp;&#9851; " + wh_hidden;
+  }
+  else {
+
+    wh_collapser.title="Hide intermediate edits";
+    wh_collapser.innerHTML = "&emsp;&#9842;"
+  }
+}
+
+var inputs = document.getElementsByTagName("input");
+for( var k = 0, indx = 0; k < inputs.length; k++ ) {
+
+   var r = inputs[k];
+   if( r.type == "radio" && r.name == "baseline" ) {
+
+      wh_radios.push( r );
+	  r.indx = indx++;
+      r.addEventListener( "click", wh_onRadio );
+      r.disabled = false;
+      var td = r.parentElement.nextElementSibling;
+      r.iterspan = td.getElementsByTagName("span")[0];
+   }
+}
+for( var edits = 0, k = wh_radios.length - 1; k >= 0; k-- ) {
+
+   var td = wh_radios[k].parentElement.nextElementSibling;
+   if( td.parentElement.className == "wh-intermediate" )
+
+      edits++;
+
+   else if( edits > 0 ){
+
+      var span = td.getElementsByTagName("span")[0];
+      span.innerHTML = "&ensp;&#9842;" + edits;
+      wh_radios[k].iterspan = span;
+      edits = 0;
+      //   also:  &#8746; (union)   &#931; (sigma)   &#215; (times)
+   }
+}
+var links = document.getElementsByTagName("a");
+for( var i = 0, indx = 0; i < links.length; i++ ) {
+
+   var l = links[i];
+   if( l.className == "wh-difflink" ){
+
+      l.indx = indx++;
+      l.addEventListener( "click", wh_onDifflink );
+   }
+}
+wh_cleaner.addEventListener( "click", wh_onCleaner );
+wh_collapser.addEventListener( "click", wh_onCollapser );
+wh_collapser.title="Hide intermediate edits";
+wh_collapser.hidden = false;
+
+}); // window.addEventListener( 'load' ...