Count and show the deprecated attribute again

Since we don’t have Deprecated stability level anymore, the only other source of information is
deprecated-since version, which conveniently to us, only exists if the symbol is deprecated.

Fixes #21789

Author: nagisa

src/librustdoc/clean/mod.rs

@@ -2490,6 +2490,7 @@ pub struct Stability {
     pub level: attr::StabilityLevel,
     pub feature: String,
     pub since: String,
+    pub deprecated_since: String,
     pub reason: String
 }
 
@@ -2500,6 +2501,8 @@ impl Clean<Stability> for attr::Stability {
             feature: self.feature.to_string(),
             since: self.since.as_ref().map_or("".to_string(),
                                               |interned| interned.to_string()),
+            deprecated_since: self.deprecated_since.as_ref().map_or("".to_string(),
+                                                                    |istr| istr.to_string()),
             reason: self.reason.as_ref().map_or("".to_string(),
                                                 |interned| interned.to_string()),
         }

src/librustdoc/html/format.rs

@@ -711,7 +711,11 @@ impl<'a> fmt::Display for Stability<'a> {
         match *stab {
             Some(ref stability) => {
                 write!(f, "<a class='stability {lvl}' title='{reason}'>{lvl}</a>",
-                       lvl = stability.level,
+                       lvl = if stability.deprecated_since.is_empty() {
+                           format!("{}", stability.level)
+                       } else {
+                           "Deprecated".to_string()
+                       },
                        reason = stability.reason)
             }
             None => Ok(())
@@ -725,7 +729,11 @@ impl<'a> fmt::Display for ConciseStability<'a> {
         match *stab {
             Some(ref stability) => {
                 write!(f, "<a class='stability {lvl}' title='{lvl}{colon}{reason}'></a>",
-                       lvl = stability.level,
+                       lvl = if stability.deprecated_since.is_empty() {
+                           format!("{}", stability.level)
+                       } else {
+                           "Deprecated".to_string()
+                       },
                        colon = if stability.reason.len() > 0 { ": " } else { "" },
                        reason = stability.reason)
             }
@@ -763,6 +771,9 @@ impl fmt::Display for ModuleSummary {
             try!(write!(f, "<span class='summary Unstable' \
                             style='width: {:.4}%; display: inline-block'>&nbsp</span>",
                         (100 * cnt.unstable) as f64/tot as f64));
+            try!(write!(f, "<span class='summary Deprecated' \
+                            style='width: {:.4}%; display: inline-block'>&nbsp</span>",
+                        (100 * cnt.deprecated) as f64/tot as f64));
             try!(write!(f, "<span class='summary Unmarked' \
                             style='width: {:.4}%; display: inline-block'>&nbsp</span>",
                         (100 * cnt.unmarked) as f64/tot as f64));
@@ -778,11 +789,12 @@ impl fmt::Display for ModuleSummary {
         let mut context = Vec::new();
 
         let tot = self.counts.total();
-        let (stable, unstable, unmarked) = if tot == 0 {
-            (0, 0, 0)
+        let (stable, unstable, deprecated, unmarked) = if tot == 0 {
+            (0, 0, 0, 0)
         } else {
             ((100 * self.counts.stable)/tot,
              (100 * self.counts.unstable)/tot,
+             (100 * self.counts.deprecated)/tot,
              (100 * self.counts.unmarked)/tot)
         };
 
@@ -794,11 +806,12 @@ its children (percentages total for {name}):
 <blockquote>
 <a class='stability Stable'></a> stable ({}%),<br/>
 <a class='stability Unstable'></a> unstable ({}%),<br/>
+<a class='stability Deprecated'></a> deprecated ({}%),<br/>
 <a class='stability Unmarked'></a> unmarked ({}%)
 </blockquote>
 The counts do not include methods or trait
 implementations that are visible only through a re-exported type.",
-stable, unstable, unmarked,
+stable, unstable, deprecated, unmarked,
 name=self.name));
         try!(write!(f, "<table>"));
         try!(fmt_inner(f, &mut context, self));

src/librustdoc/stability_summary.rs

@@ -29,18 +29,20 @@ use html::render::cache;
 /// The counts for each stability level.
 #[derive(Copy)]
 pub struct Counts {
-    pub unstable: uint,
-    pub stable: uint,
+    pub deprecated: u64,
+    pub unstable: u64,
+    pub stable: u64,
 
     /// No stability level, inherited or otherwise.
-    pub unmarked: uint,
+    pub unmarked: u64,
 }
 
 impl Add for Counts {
     type Output = Counts;
 
     fn add(self, other: Counts) -> Counts {
         Counts {
+            deprecated:   self.deprecated   + other.deprecated,
             unstable:     self.unstable     + other.unstable,
             stable:       self.stable       + other.stable,
             unmarked:     self.unmarked     + other.unmarked,
@@ -51,14 +53,15 @@ impl Add for Counts {
 impl Counts {
     fn zero() -> Counts {
         Counts {
+            deprecated:   0,
             unstable:     0,
             stable:       0,
             unmarked:     0,
         }
     }
 
-    pub fn total(&self) -> uint {
-        self.unstable + self.stable + self.unmarked
+    pub fn total(&self) -> u64 {
+        self.deprecated + self.unstable + self.stable + self.unmarked
     }
 }
 
@@ -94,9 +97,14 @@ fn visible(item: &Item) -> bool {
 fn count_stability(stab: Option<&Stability>) -> Counts {
     match stab {
         None            => Counts { unmarked: 1,     .. Counts::zero() },
-        Some(ref stab) => match stab.level {
-            Unstable    => Counts { unstable: 1,     .. Counts::zero() },
-            Stable      => Counts { stable: 1,       .. Counts::zero() },
+        Some(ref stab) => {
+            if !stab.deprecated_since.is_empty() {
+                return Counts { deprecated: 1, .. Counts::zero() };
+            }
+            match stab.level {
+                Unstable    => Counts { unstable: 1,     .. Counts::zero() },
+                Stable      => Counts { stable: 1,       .. Counts::zero() },
+            }
         }
     }
 }