cannam@147: function initSidebar() {
cannam@147:   var filename = document.location.pathname;
cannam@147: 
cannam@147:   if (filename.slice(0, 5) == "/next") {
cannam@147:     filename = filename.slice(5);
cannam@147:   }
cannam@147: 
cannam@147:   if (filename == "/") {
cannam@147:     filename = "/index.html";
cannam@147:   } else if (filename.slice(0, 6) == "/news/") {
cannam@147:     filename = "/news/";
cannam@147:   }
cannam@147: 
cannam@147:   var menu = document.getElementById("menu");
cannam@147:   var setMenuLayout = function() {
cannam@147:     if (window.innerWidth < 900) {
cannam@147:       document.body.className = "narrow";
cannam@147:       menu.className = "";
cannam@147:     } else {
cannam@147:       if (document.body.clientWidth < 1340) {
cannam@147:         document.body.className = "normal";
cannam@147:       } else {
cannam@147:         document.body.className = "wide";
cannam@147:       }
cannam@147: 
cannam@147:       var y = (window.pageYOffset !== undefined) ? window.pageYOffset :
cannam@147:         (document.documentElement || document.body.parentNode || document.body).scrollTop;
cannam@147: 
cannam@147:       if (y < 444 || window.innerHeight < menu.clientHeight + 100) {
cannam@147:         menu.className = "";
cannam@147:       } else {
cannam@147:         menu.className = "floating";
cannam@147:       }
cannam@147:     }
cannam@147:   };
cannam@147:   setMenuLayout();
cannam@147:   window.onresize = setMenuLayout;
cannam@147:   window.onscroll = setMenuLayout;
cannam@147: 
cannam@147:   var items = menu.getElementsByTagName("li");
cannam@147:   var toc = null;
cannam@147:   for (var i = 0; i < items.length; i++) {
cannam@147:     var link = items[i].getElementsByTagName("a")[0];
cannam@147:     var href = link.href;
cannam@147:     if (href.lastIndexOf(filename) >= 0) {
cannam@147:       var parent = link.parentNode;
cannam@147: 
cannam@147:       while (link.childNodes.length > 0) {
cannam@147:         var child = link.childNodes[0];
cannam@147:         link.removeChild(child);
cannam@147:         parent.appendChild(child);
cannam@147:       }
cannam@147:       parent.removeChild(link);
cannam@147:       items[i].className = "selected";
cannam@147:       toc = document.createElement("ul");
cannam@147:       toc.id = "toc";
cannam@147:       items[i].appendChild(toc);
cannam@147:     }
cannam@147:   }
cannam@147: 
cannam@147:   document.getElementById("main_content").style.minHeight = menu.clientHeight + 100 + "px";
cannam@147: 
cannam@147:   return toc;
cannam@147: }
cannam@147: 
cannam@147: function setupSidebar() {
cannam@147:   var filename = document.location.pathname;
cannam@147: 
cannam@147:   if (filename.slice(0, 5) == "/next") {
cannam@147:     filename = filename.slice(5);
cannam@147:   }
cannam@147: 
cannam@147:   var isNews = filename.slice(0, 6) == "/news/";
cannam@147: 
cannam@147:   var toc = initSidebar();
cannam@147:   if (toc) {
cannam@147:     var content = document.getElementById("main_content").childNodes;
cannam@147:     var headings = [];
cannam@147: 
cannam@147:     for (var i = 0; i < content.length; i++) {
cannam@147:       if (content[i].tagName == "H2" ||
cannam@147:           (!isNews && (content[i].tagName == "H3" || content[i].tagName == "H4"))) {
cannam@147:         headings.push(content[i]);
cannam@147:       }
cannam@147:     }
cannam@147: 
cannam@147:     var levels = [toc];
cannam@147:     for (var i in headings) {
cannam@147:       var hl = headings[i].tagName.slice(1) - 1;
cannam@147:       while (hl > levels.length) {
cannam@147:         var parent = levels[levels.length - 1];
cannam@147:         var item = parent.childNodes[parent.childNodes.length - 1];
cannam@147:         var sublist = document.createElement("ul");
cannam@147:         item.appendChild(sublist);
cannam@147:         levels.push(sublist);
cannam@147:       }
cannam@147:       while (hl < levels.length) {
cannam@147:         levels.pop();
cannam@147:       }
cannam@147: 
cannam@147:       var parent = levels[levels.length - 1];
cannam@147:       var item = document.createElement("li");
cannam@147:       var p = document.createElement("p");
cannam@147:       var link = document.createElement("a");
cannam@147:       p.appendChild(document.createTextNode(headings[i].innerText || headings[i].textContent));
cannam@147:       var hlinks = headings[i].getElementsByTagName("a");
cannam@147:       if (hlinks.length == 1) {
cannam@147:         link.href = hlinks[0].href;
cannam@147:       } else {
cannam@147:         link.href = "#" + headings[i].id;
cannam@147:       }
cannam@147:       link.appendChild(p);
cannam@147:       item.appendChild(link);
cannam@147:       parent.appendChild(item);
cannam@147:     }
cannam@147:   }
cannam@147: }
cannam@147: 
cannam@147: function setupNewsSidebar(items) {
cannam@147:   var toc = initSidebar();
cannam@147:   if (toc) {
cannam@147:     for (var i in items) {
cannam@147:       var item = document.createElement("li");
cannam@147:       var p = document.createElement("p");
cannam@147:       var link = document.createElement("a");
cannam@147:       p.appendChild(document.createTextNode(items[i].title));
cannam@147:       link.href = items[i].url;
cannam@147:       link.appendChild(p);
cannam@147:       item.appendChild(link);
cannam@147:       toc.appendChild(item);
cannam@147:     }
cannam@147:   }
cannam@147: }