SI-6017 Scaladoc: Show all letters without dangling links

Use <span> instead of <a href="..."> if there is no page on the letter.

2 files changed, 18 insertions, 8 deletions

diff --git a/src/compiler/scala/tools/nsc/doc/html/page/Index.scala b/src/compiler/scala/tools/nsc/doc/html/page/Index.scala
index 2f83741d4e..c76bdc58d9 100644
--- a/src/compiler/scala/tools/nsc/doc/html/page/Index.scala
+++ b/src/compiler/scala/tools/nsc/doc/html/page/Index.scala
@@ -48,14 +48,20 @@ class Index(universe: doc.Universe, val index: doc.Index) extends HtmlPage {
       </div>
     </body>
 
-  def letters: NodeSeq = {
-    val xs = index.firstLetterIndex.keys.toSeq
-    xs.sorted map {
-      c => <a target="template" href={ "index/index-" + c + ".html" }>{
-        if (c == '_') '#' else c.toUpper
-      }</a>
+  def letters: NodeSeq =
+    '_' +: ('a' to 'z') map {
+      char => {
+        val label = if (char == '_') '#' else char.toUpper
+
+        index.firstLetterIndex.get(char) match {
+          case Some(_) =>
+            <a target="template" href={ "index/index-" + char + ".html" }>{
+              label
+            }</a>
+          case None => <span>{ label }</span>
+        }
+      }
     }
-  }
 
   def browser =
     <div id="browser" class="ui-layout-west">
diff --git a/src/compiler/scala/tools/nsc/doc/html/resource/lib/index.css b/src/compiler/scala/tools/nsc/doc/html/resource/lib/index.css
index 2a8f9b570a..55fb370a41 100644
--- a/src/compiler/scala/tools/nsc/doc/html/resource/lib/index.css
+++ b/src/compiler/scala/tools/nsc/doc/html/resource/lib/index.css
@@ -206,7 +206,7 @@ h1 {
   border-right:0;
 }
 
-#letters > a {
+#letters > a, #letters > span {
 /*  font-family: monospace;*/
   color: #858484;
   font-weight: bold;
@@ -214,6 +214,10 @@ h1 {
   text-shadow: #ffffff 0 1px 0;
   padding-right: 2px;
 }
+
+#letters > span {
+  color: #bbb;
+}
   
 #tpl {
   display: block;