From a759ad3f0f71ea9626d84c08458b57b73cf6470d Mon Sep 17 00:00:00 2001
From: wakgill <76528604+wakgill@users.noreply.github.com>
Date: Thu, 31 Dec 2020 22:37:15 -0600
Subject: [PATCH] Update default.html

---
 _layouts/default.html | 137 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 136 insertions(+), 1 deletion(-)

diff --git a/_layouts/default.html b/_layouts/default.html
index 42682b2..1b5b725 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -131,8 +131,11 @@
         {% if site.heading_anchors != false %}
           {% include vendor/anchor_headings.html html=content beforeHeading="true" anchorBody="<svg viewBox=\"0 0 16 16\" aria-hidden=\"true\"><use xlink:href=\"#svg-link\"></use></svg>" anchorClass="anchor-heading" anchorAttrs="aria-labelledby=\"%html_id%\"" %}
         {% else %}
-          {{ content }}
+        
+        <span id="CONTENT">
+          {{ content }}</span>
         {% endif %}
+          
 
         {% if page.has_children == true and page.has_toc != false %}
           <hr>
@@ -195,5 +198,137 @@
       <div class="search-overlay"></div>
     {% endif %}
   </div>
+  <script type="text/javascript">
+	function findPos(obj) {
+  var curtop = 0;
+  while (obj && obj.offsetParent) {
+    curtop += obj.offsetTop; // todo: + webkit-transform
+    obj = obj.offsetParent;
+  }
+  return curtop;
+}
+var artificial = null;
+var prevhash = "";
+function scrollToHash() {
+  if (document.location.hash.replace(/^#/, "")==prevhash.replace(/^#/, ""))
+    return;
+  prevhash = document.location.hash;
+  if (document.location.hash.match(/#[0-9.]+%/)) {
+    var p = parseFloat(document.location.hash.substring(1));
+    if (0 < p && p < 100 /*&& p%5 != 0*/) {
+      var content = document.getElementById("CONTENT")
+      var y = findPos(content) + (content.offsetHeight)*p/100;
+      window.scrollTo(0, y-16);
+    }
+  }
+
+  var adr = document.location.hash.match(/selection-(\d+).(\d+)-(\d+).(\d+)/);
+  if (adr) {
+    var pos=0,begin=null,end=null;
+    function recur(e) {
+      if (e.nodeType==1) pos = (pos&~1)+2;
+      if (e.nodeType==3) pos = pos|1;
+      if (pos==adr[1]) begin=[e, adr[2]];
+      if (pos==adr[3]) end  =[e, adr[4]];
+      for (var i=0; i<e.childNodes.length; i++)
+        recur(e.childNodes[i]);
+      if (e.childNodes.length>0 && e.lastChild.nodeType==3)
+        pos = (pos&~1)+2;
+    }
+    // remove old "artificial" span if any
+    if (artificial) {
+      artificial.previousSibling.data += artificial.childNodes[0].data;
+      artificial.parentNode.removeChild(artificial);
+    }
+    var content = document.getElementById("CONTENT");
+    recur(content.childNodes[content.childNodes[0].nodeType==3 ? 1 : 0]);
+    if (begin!=null && end!=null) {
+      // scroll to selection
+      if (begin[0].nodeType==3) {
+        var text = document.createTextNode(begin[0].data.substr(0, begin[1]));
+        artificial = document.createElement("SPAN");
+        artificial.appendChild(document.createTextNode(begin[0].data.substr(begin[1])));
+
+   begin[0].parentNode.insertBefore(text, begin[0]);
+        begin[0].parentNode.replaceChild(artificial, begin[0]);
+
+ if (end[0]===begin[0])
+ end = [artificial.childNodes[0], end[1]-begin[1]];
+  begin = [artificial.childNodes[0], 0];
+        /* window.scrollTo(0, findPos(artificial)-8); */ artificial.scrollIntoView(true);
+      } else if (begin[0].nodeType==1) {
+        /* window.scrollTo(0, findPos(begin[0])-8);   */ begin[0].scrollIntoView(true);
+      }
+
+if (window.getSelection) {
+        var sel = window.getSelection();
+        sel.removeAllRanges();
+        var range = document.createRange();
+        range.setStart(begin[0], begin[1]);
+        range.setEnd  (  end[0],   end[1]);
+        sel.addRange(range);
+      } else if (document.selection) { // IE
+      }
+    }
+  }
+}
+window.onhashchange = scrollToHash;
+var initScrollToHashDone = false;
+function initScrollToHash() {
+  if (!initScrollToHashDone) {
+    initScrollToHashDone = true;
+    scrollToHash();
+  }
+}
+window.onload = initScrollToHash;
+setTimeout(initScrollToHash, 500); /* onload can be delayed by counter code */
+
+//document.onselectionchange = /* only webkit has working document.onselectionchange */
+document.onmousedown = document.onmouseup = function(e) {
+  var newhash = "";
+  if (window.getSelection) {
+    var sel=window.getSelection();
+    if (!sel.isCollapsed) {
+      var pos=0,begin=[0,0],end=[0,0];
+      var range=sel.getRangeAt(0);
+      function recur(e) {
+        if (e===artificial) {
+          if (range.startContainer===e.childNodes[0]) begin=[pos, e.previousSibling.data.length+range.startOffset];
+          if (range.endContainer  ===e.childNodes[0]) end  =[pos, e.previousSibling.data.length+range.endOffset ];
+        } else {
+          if (e.nodeType==1) pos = (pos&~1)+2;
+          if (e.nodeType==3) pos = pos|1;
+          if (range.startContainer===e) begin=[pos, range.startOffset];
+          if (range.endContainer  ===e) end  =[pos, range.endOffset ];
+          for (var i=0; i<e.childNodes.length; i++)
+            recur(e.childNodes[i]);
+          if (e.childNodes.length>0 && e.lastChild.nodeType==3)
+            pos = (pos&~1)+2;
+        }
+      }
+
+ var content = document.getElementById("CONTENT");
+      recur(content.childNodes[content.childNodes[0].nodeType==3 ? 1 : 0]);
+      if (begin[0]>0 && end[0]>0) {
+        newhash = "selection-"+begin[0]+"."+begin[1]+"-"+end[0]+"."+end[1];
+      }
+    }
+  } else if (document.selection) { // IE
+  }
+
+  try {
+    var oldhash = location.hash.replace(/^#/, "");
+    if (oldhash != newhash) {
+      prevhash = newhash; /* avoid firing window.onhashchange and scrolling */
+      if (history.replaceState)
+        history.replaceState('', document.title, newhash=="" ? window.location.pathname : '#'+newhash);
+      else
+        location.hash = newhash;
+    }
+  } catch(e) {
+  }
+};
+</script>
+
 </body>
 </html>