FEATURE: support non-Latin characters (#4)

common/header.html

@@ -23,10 +23,13 @@
     const cleanItem = item
       .trim()
       .toLowerCase()
-      .replace(/[^\w]+/g, "-")
+      .replace(
+        /[\{\}\[\]\\\/\<\>\(\)\|\+\?\*\^\'\`\'\"\.\_\d\s~!@#$%&,;:=]/gi,
+        "-"
+      )
+      .replace(/\-\-+/g, "-")
       .replace(/^\-/, "")
-      .replace(/\-$/, "")
+      .replace(/\-$/, "");
-      .replace(/\-\-+/g, "-");
 
     return cleanItem;
   };
@@ -45,8 +48,6 @@
     const unique = item.attr("id");
     const text = item.text();
 
-    item.attr({ "data-d-toc": unique });
-
     const tocItem = $("<li/>", {
       class: "d-toc-item",
       "data-d-toc": unique
@@ -298,18 +299,17 @@
 
         let id = heading.attr("id") || "";
 
-        if (id.length) {
+        if (!id.length) {
-          heading
-            .attr("id", id)
-            .append(createAnchors(id))
-            .addClass("d-toc-post-heading");
-        } else {
           id = cleanUp(heading.text());
+        }
+
         heading
-            .attr("id", id)
+          .attr({
+            id: id,
+            "data-d-toc": id
+          })
           .append(createAnchors(id))
           .addClass("d-toc-post-heading");
-        }
       });
 
       body