Rollup merge of #33196 - mitaa:rdoc-crate-links, r=alexcrichton

rustdoc: Linkify extern crates

fixes #33178

r? @alexcrichton

Author: Manishearth

src/librustdoc/clean/mod.rs

@@ -38,7 +38,7 @@ use rustc_trans::back::link;
 use rustc::middle::cstore::{self, CrateStore};
 use rustc::middle::privacy::AccessLevels;
 use rustc::hir::def::Def;
-use rustc::hir::def_id::{DefId, DefIndex};
+use rustc::hir::def_id::{DefId, DefIndex, CRATE_DEF_INDEX};
 use rustc::ty::subst::{self, ParamSpace, VecPerParamSpace};
 use rustc::ty;
 use rustc::middle::stability;
@@ -2388,7 +2388,7 @@ impl Clean<Item> for doctree::ExternCrate {
             name: None,
             attrs: self.attrs.clean(cx),
             source: self.whence.clean(cx),
-            def_id: cx.map.local_def_id(0),
+            def_id: DefId { krate: self.cnum, index: CRATE_DEF_INDEX },
             visibility: self.vis.clean(cx),
             stability: None,
             deprecation: None,

src/librustdoc/doctree.rs

@@ -232,6 +232,7 @@ pub struct Macro {
 
 pub struct ExternCrate {
     pub name: Name,
+    pub cnum: ast::CrateNum,
     pub path: Option<String>,
     pub vis: hir::Visibility,
     pub attrs: hir::HirVec<ast::Attribute>,

src/librustdoc/html/format.rs

@@ -57,6 +57,11 @@ pub struct TyParamBounds<'a>(pub &'a [clean::TyParamBound]);
 pub struct CommaSep<'a, T: 'a>(pub &'a [T]);
 pub struct AbiSpace(pub Abi);
 
+pub struct HRef<'a> {
+    pub did: DefId,
+    pub text: &'a str,
+}
+
 impl<'a> VisSpace<'a> {
     pub fn get(self) -> &'a Option<clean::Visibility> {
         let VisSpace(v) = self; v
@@ -363,15 +368,7 @@ fn resolved_path(w: &mut fmt::Formatter, did: DefId, path: &clean::Path,
             }
         }
     }
-
-    match href(did) {
-        Some((url, shortty, fqp)) => {
-            write!(w, "<a class='{}' href='{}' title='{}'>{}</a>",
-                   shortty, url, fqp.join("::"), last.name)?;
-        }
-        _ => write!(w, "{}", last.name)?,
-    }
-    write!(w, "{}", last.params)?;
+    write!(w, "{}{}", HRef::new(did, &last.name), last.params)?;
     Ok(())
 }
 
@@ -437,6 +434,24 @@ fn tybounds(w: &mut fmt::Formatter,
     }
 }
 
+impl<'a> HRef<'a> {
+    pub fn new(did: DefId, text: &'a str) -> HRef<'a> {
+        HRef { did: did, text: text }
+    }
+}
+
+impl<'a> fmt::Display for HRef<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match href(self.did) {
+            Some((url, shortty, fqp)) => {
+                write!(f, "<a class='{}' href='{}' title='{}'>{}</a>",
+                       shortty, url, fqp.join("::"), self.text)
+            }
+            _ => write!(f, "{}", self.text),
+        }
+    }
+}
+
 impl fmt::Display for clean::Type {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {

src/librustdoc/html/render.rs

@@ -1739,16 +1739,19 @@ fn item_module(w: &mut fmt::Formatter, cx: &Context,
 
         match myitem.inner {
             clean::ExternCrateItem(ref name, ref src) => {
+                use html::format::HRef;
+
                 match *src {
                     Some(ref src) => {
                         write!(w, "<tr><td><code>{}extern crate {} as {};",
                                VisSpace(&myitem.visibility),
-                               src,
+                               HRef::new(myitem.def_id, src),
                                name)?
                     }
                     None => {
                         write!(w, "<tr><td><code>{}extern crate {};",
-                               VisSpace(&myitem.visibility), name)?
+                               VisSpace(&myitem.visibility),
+                               HRef::new(myitem.def_id, name))?
                     }
                 }
                 write!(w, "</code></td></tr>")?;

src/librustdoc/visit_ast.rs

@@ -316,7 +316,10 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
         let name = renamed.unwrap_or(item.name);
         match item.node {
             hir::ItemExternCrate(ref p) => {
+                let cstore = &self.cx.sess().cstore;
                 om.extern_crates.push(ExternCrate {
+                    cnum: cstore.extern_mod_stmt_cnum(item.id)
+                                .unwrap_or(ast::CrateNum::max_value()),
                     name: name,
                     path: p.map(|x|x.to_string()),
                     vis: item.vis.clone(),

src/librustdoc/visit_lib.rs

@@ -44,6 +44,7 @@ impl<'a, 'b, 'tcx> LibEmbargoVisitor<'a, 'b, 'tcx> {
 
     pub fn visit_lib(&mut self, cnum: ast::CrateNum) {
         let did = DefId { krate: cnum, index: CRATE_DEF_INDEX };
+        self.update(did, Some(AccessLevel::Public));
         self.visit_mod(did);
     }
 

src/test/rustdoc/issue-33178-1.rs

@@ -0,0 +1,20 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// aux-build:empty.rs
+// aux-build:variant-struct.rs
+// ignore-cross-compile
+
+// @has issue_33178_1/index.html
+// @!has - //a/@title empty
+pub extern crate empty;
+
+// @!has - //a/@title variant_struct
+pub extern crate variant_struct as foo;

src/test/rustdoc/issue-33178.rs

@@ -0,0 +1,23 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// aux-build:empty.rs
+// aux-build:variant-struct.rs
+// build-aux-docs
+// ignore-cross-compile
+
+// @has issue_33178/index.html
+// @has - //a/@title empty
+// @has - //a/@href ../empty/index.html
+pub extern crate empty;
+
+// @has - //a/@title variant_struct
+// @has - //a/@href ../variant_struct/index.html
+pub extern crate variant_struct as foo;