rustdoc: hardcode each header as a link.

This avoids having to include JS in the guide/tutorial/manual pages just
to get the headers being links. The on-hover behaviour showing the
little section marker § is preserved, because that gives a useful hint
that the heading is a link.

src/librustdoc/html/markdown.rs

@@ -209,7 +209,8 @@ pub fn render(w: &mut io::Writer, s: &str, print_toc: bool) -> fmt::Result {
         };
 
         // Render the HTML
-        let text = format!(r#"<h{lvl} id="{id}">{sec_len,plural,=0{}other{{sec} }}{}</h{lvl}>"#,
+        let text = format!(r#"<h{lvl} id="{id}"><a
+                           href="\#{id}">{sec_len,plural,=0{}other{{sec} }}{}</a></h{lvl}>"#,
                            s, lvl = level, id = id,
                            sec_len = sec.len(), sec = sec);
 

src/librustdoc/html/render.rs

@@ -1064,7 +1064,8 @@ fn item_module(w: &mut Writer, cx: &Context,
                 clean::ForeignStaticItem(..)   => ("ffi-statics", "Foreign Statics"),
                 clean::MacroItem(..)           => ("macros", "Macros"),
             };
-            try!(write!(w, "<h2 id='{}'>{}</h2>\n<table>", short, name));
+            try!(write!(w, "<h2 id='{id}'><a href=\"\\#{id}\">{name}</a></h2>\n<table>",
+                        id = short, name = name));
         }
 
         match myitem.inner {

src/librustdoc/html/static/main.css

@@ -320,9 +320,16 @@ pre.rust .string { color: #718C00; }
 pre.rust .lifetime { color: #C13928; }
 pre.rust .attribute, pre.rust .attribute .ident { color: #C82829; }
 
-h1 a.anchor,
+h1:hover a:after,
-h2 a.anchor,
+h2:hover a:after,
-h3 a.anchor { display: none; }
+h3:hover a:after,
-h1:hover a.anchor,
+h4:hover a:after,
-h2:hover a.anchor,
+h5:hover a:after,
-h3:hover a.anchor { display: inline-block; }
+h6:hover a:after {
+  content: ' § ';
+}
+
+h1.fqn:hover a:after,
+:hover a.fnname:after {
+  content: none;
+}

src/librustdoc/html/static/main.js

@@ -600,10 +600,4 @@
 
     initSearch(searchIndex);
 
-    $.each($('h1, h2, h3'), function(idx, element) {
-        if ($(element).attr('id') != undefined) {
-            $(element).append('<a href="#' + $(element).attr('id') + '" ' +
-                              'class="anchor"> § </a>');
-        }
-    });
 }());