Set possibility to hide attributes

src/librustdoc/html/render.rs

@@ -2493,24 +2493,24 @@ fn item_enum(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
 }
 
 fn attribute_without_value(s: &str) -> bool {
-    vec!("must_use", "no_mangle", "unsafe_destructor_blind_to_params").iter().any(|x| x == &s)
+    ["must_use", "no_mangle", "unsafe_destructor_blind_to_params"].iter().any(|x| x == &s)
 }
 
 fn attribute_with_value(s: &str) -> bool {
-    vec!("export_name", "lang", "link_section", "must_use").iter().any(|x| x == &s)
+    ["export_name", "lang", "link_section", "must_use"].iter().any(|x| x == &s)
 }
 
 fn attribute_with_values(s: &str) -> bool {
-    vec!("repr").iter().any(|x| x == &s)
+    ["repr"].iter().any(|x| x == &s)
 }
 
-fn render_attribute(attr: &clean::Attribute, recurse: bool) -> String {
+fn render_attribute(attr: &clean::Attribute, recurse: bool) -> Option<String> {
     match *attr {
         clean::Word(ref s) if attribute_without_value(&*s) || recurse => {
-            format!("{}", s)
+            Some(format!("{}", s))
         }
         clean::NameValue(ref k, ref v) if attribute_with_value(&*k) => {
-            format!("{} = \"{}\"", k, v)
+            Some(format!("{} = \"{}\"", k, v))
         }
         clean::List(ref k, ref values) if attribute_with_values(&*k) => {
             let mut display = Vec::new();
@@ -2521,21 +2521,25 @@ fn render_attribute(attr: &clean::Attribute, recurse: bool) -> String {
                     display.push(format!("{}", s));
                 }
             }
-            format!("{}({})", k, display.join(", "))
+            Some(format!("{}({})", k, display.join(", ")))
         }
         _ => {
-            String::new()
+            None
         }
     }
 }
 
 fn render_attributes(w: &mut fmt::Formatter, it: &clean::Item) -> fmt::Result {
+    let mut attrs = String::new();
+
     for attr in &it.attrs {
-        let s = render_attribute(attr, false);
-        if s.len() > 0 {
-            write!(w, "#[{}]\n", s)?;
+        if let Some(s) = render_attribute(attr, false) {
+            attrs.push_str(&format!("#[{}]\n", s));
         }
     }
+    if attrs.len() > 0 {
+        write!(w, "<div class=\"docblock\">{}</div>", &attrs)?;
+    }
     Ok(())
 }