Rollup merge of rust-lang#37134 - GuillaumeGomez:display_tag, r=steveklabnik

Print more tags in rustdoc

r? @steveklabnik

cc @frewsxcv

A little screenshot:

<img width="1440" alt="screen shot 2016-10-13 at 01 41 53" src="https://cloud.githubusercontent.com/assets/3050060/19331745/873cd71e-90e6-11e6-88f8-715668366a3f.png">

Author: eddyb

src/librustdoc/html/render.rs

@@ -2492,18 +2492,55 @@ fn item_enum(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
     Ok(())
 }
 
+fn attribute_without_value(s: &str) -> bool {
+    ["must_use", "no_mangle", "unsafe_destructor_blind_to_params"].iter().any(|x| x == &s)
+}
+
+fn attribute_with_value(s: &str) -> bool {
+    ["export_name", "lang", "link_section", "must_use"].iter().any(|x| x == &s)
+}
+
+fn attribute_with_values(s: &str) -> bool {
+    ["repr"].iter().any(|x| x == &s)
+}
+
+fn render_attribute(attr: &clean::Attribute, recurse: bool) -> Option<String> {
+    match *attr {
+        clean::Word(ref s) if attribute_without_value(&*s) || recurse => {
+            Some(format!("{}", s))
+        }
+        clean::NameValue(ref k, ref v) if attribute_with_value(&*k) => {
+            Some(format!("{} = \"{}\"", k, v))
+        }
+        clean::List(ref k, ref values) if attribute_with_values(&*k) => {
+            let display: Vec<_> = values.iter()
+                                        .filter_map(|value| render_attribute(value, true))
+                                        .map(|entry| format!("{}", entry))
+                                        .collect();
+
+            if display.len() > 0 {
+                Some(format!("{}({})", k, display.join(", ")))
+            } else {
+                None
+            }
+        }
+        _ => {
+            None
+        }
+    }
+}
+
 fn render_attributes(w: &mut fmt::Formatter, it: &clean::Item) -> fmt::Result {
+    let mut attrs = String::new();
+
     for attr in &it.attrs {
-        match *attr {
-            clean::Word(ref s) if *s == "must_use" => {
-                write!(w, "#[{}]\n", s)?;
-            }
-            clean::NameValue(ref k, ref v) if *k == "must_use" => {
-                write!(w, "#[{} = \"{}\"]\n", k, v)?;
-            }
-            _ => ()
+        if let Some(s) = render_attribute(attr, false) {
+            attrs.push_str(&format!("#[{}]\n", s));
         }
     }
+    if attrs.len() > 0 {
+        write!(w, "<div class=\"docblock attributes\">{}</div>", &attrs)?;
+    }
     Ok(())
 }
 

src/librustdoc/html/static/main.js

@@ -963,27 +963,35 @@
         }
     }
 
-    $("#toggle-all-docs").on("click", toggleAllDocs);
-
-    $(document).on("click", ".collapse-toggle", function() {
-        var toggle = $(this);
+    function collapseDocs(toggle, animate) {
         var relatedDoc = toggle.parent().next();
         if (relatedDoc.is(".stability")) {
             relatedDoc = relatedDoc.next();
         }
         if (relatedDoc.is(".docblock")) {
             if (relatedDoc.is(":visible")) {
-                relatedDoc.slideUp({duration: 'fast', easing: 'linear'});
+                if (animate === true) {
+                    relatedDoc.slideUp({duration: 'fast', easing: 'linear'});
+                    toggle.children(".toggle-label").fadeIn();
+                } else {
+                    relatedDoc.hide();
+                    toggle.children(".toggle-label").show();
+                }
                 toggle.parent(".toggle-wrapper").addClass("collapsed");
                 toggle.children(".inner").text(labelForToggleButton(true));
-                toggle.children(".toggle-label").fadeIn();
             } else {
                 relatedDoc.slideDown({duration: 'fast', easing: 'linear'});
                 toggle.parent(".toggle-wrapper").removeClass("collapsed");
                 toggle.children(".inner").text(labelForToggleButton(false));
                 toggle.children(".toggle-label").hide();
             }
         }
+    }
+
+    $("#toggle-all-docs").on("click", toggleAllDocs);
+
+    $(document).on("click", ".collapse-toggle", function() {
+        collapseDocs($(this), true)
     });
 
     $(function() {
@@ -999,12 +1007,22 @@
         });
 
         var mainToggle =
-            $(toggle).append(
+            $(toggle.clone()).append(
                 $('<span/>', {'class': 'toggle-label'})
                     .css('display', 'none')
                     .html('&nbsp;Expand&nbsp;description'));
         var wrapper = $("<div class='toggle-wrapper'>").append(mainToggle);
         $("#main > .docblock").before(wrapper);
+        var mainToggle =
+            $(toggle).append(
+                $('<span/>', {'class': 'toggle-label'})
+                    .css('display', 'none')
+                    .html('&nbsp;Expand&nbsp;attributes'));
+        var wrapper = $("<div class='toggle-wrapper toggle-attributes'>").append(mainToggle);
+        $("#main > pre > .attributes").each(function() {
+            $(this).before(wrapper);
+            collapseDocs($($(this).prev().children()[0]), false);
+        });
     });
 
     $('pre.line-numbers').on('click', 'span', function() {