Add generate-old-style-files option to rustdoc

src/bootstrap/doc.rs

@@ -328,7 +328,8 @@ fn invoke_rustdoc(builder: &Builder, compiler: Compiler, target: Interned<String
         .arg("-o").arg(&out)
         .arg(&path)
         .arg("--markdown-css")
-        .arg("../rust.css");
+        .arg("../rust.css")
+        .arg("--generate-redirect-pages");
 
     builder.run(&mut cmd);
 }
@@ -503,6 +504,7 @@ impl Step for Std {
             cargo.arg("--")
                  .arg("--markdown-css").arg("rust.css")
                  .arg("--markdown-no-toc")
+                 .arg("--generate-redirect-pages")
                  .arg("--index-page").arg(&builder.src.join("src/doc/index.md"));
 
             builder.run(&mut cargo);

src/librustdoc/config.rs

@@ -192,6 +192,8 @@ pub struct RenderOptions {
     /// If present, playground URL to use in the "Run" button added to code samples generated from
     /// standalone Markdown files. If not present, `playground_url` is used.
     pub markdown_playground_url: Option<String>,
+    /// Option (disabled by default) to generate files used by RLS and some other tools.
+    pub generate_redirect_pages: bool,
 }
 
 impl Options {
@@ -434,6 +436,7 @@ impl Options {
         let markdown_playground_url = matches.opt_str("markdown-playground-url");
         let crate_version = matches.opt_str("crate-version");
         let enable_index_page = matches.opt_present("enable-index-page") || index_page.is_some();
+        let generate_redirect_pages = matches.opt_present("generate-redirect-pages");
 
         let (lint_opts, describe_lints, lint_cap) = get_cmd_lint_options(matches, error_format);
 
@@ -475,6 +478,7 @@ impl Options {
                 markdown_no_toc,
                 markdown_css,
                 markdown_playground_url,
+                generate_redirect_pages,
             }
         })
     }

src/librustdoc/html/render.rs

@@ -43,7 +43,7 @@ use std::default::Default;
 use std::error;
 use std::fmt::{self, Display, Formatter, Write as FmtWrite};
 use std::ffi::OsStr;
-use std::fs::{self, File};
+use std::fs::{self, File, OpenOptions};
 use std::io::prelude::*;
 use std::io::{self, BufWriter, BufReader};
 use std::mem;
@@ -140,6 +140,8 @@ struct SharedContext {
     /// Suffix to be added on resource files (if suffix is "-v2" then "light.css" becomes
     /// "light-v2.css").
     pub resource_suffix: String,
+    /// Option disabled by default to generate files used by RLS and some other tools.
+    pub generate_redirect_pages: bool,
 }
 
 impl SharedContext {
@@ -506,6 +508,7 @@ pub fn run(mut krate: clean::Crate,
         extension_css,
         extern_html_root_urls,
         resource_suffix,
+        generate_redirect_pages,
         ..
     } = options;
 
@@ -533,6 +536,7 @@ pub fn run(mut krate: clean::Crate,
         sort_modules_alphabetically,
         themes,
         resource_suffix,
+        generate_redirect_pages,
     };
 
     // If user passed in `--playground-url` arg, we fill in crate name here
@@ -2143,6 +2147,27 @@ impl Context {
                 if !self.render_redirect_pages {
                     all.append(full_path(self, &item), &item_type);
                 }
+                if self.shared.generate_redirect_pages {
+                    // Redirect from a sane URL using the namespace to Rustdoc's
+                    // URL for the page.
+                    let redir_name = format!("{}.{}.html", name, item_type.name_space());
+                    let redir_dst = self.dst.join(redir_name);
+                    if let Ok(redirect_out) = OpenOptions::new().create_new(true)
+                                                                .write(true)
+                                                                .open(&redir_dst) {
+                        let mut redirect_out = BufWriter::new(redirect_out);
+                        try_err!(layout::redirect(&mut redirect_out, file_name), &redir_dst);
+                    }
+                     // If the item is a macro, redirect from the old macro URL (with !)
+                    // to the new one (without).
+                    if item_type == ItemType::Macro {
+                        let redir_name = format!("{}.{}!.html", item_type, name);
+                        let redir_dst = self.dst.join(redir_name);
+                        let redirect_out = try_err!(File::create(&redir_dst), &redir_dst);
+                        let mut redirect_out = BufWriter::new(redirect_out);
+                        try_err!(layout::redirect(&mut redirect_out, file_name), &redir_dst);
+                    }
+                }
             }
         }
         Ok(())

src/librustdoc/lib.rs

@@ -338,6 +338,11 @@ fn opts() -> Vec<RustcOptGroup> {
                        "enable-index-page",
                        "To enable generation of the index page")
         }),
+        stable("generate-redirect-pages", |o| {
+            o.optflag("",
+                      "generate-redirect-pages",
+                      "Generate extra pages to support legacy URLs and tool links")
+        }),
     ]
 }
 

src/test/rustdoc/issue-19190.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// compile-flags:--generate-redirect-pages
+
 use std::ops::Deref;
 
 pub struct Foo;
@@ -23,6 +25,9 @@ impl Deref for Bar {
     fn deref(&self) -> &Foo { loop {} }
 }
 
+// @has issue_19190/Bar.t.html
 // @has issue_19190/struct.Bar.html
+// @has - '//*[@id="foo.v"]' 'fn foo(&self)'
 // @has - '//*[@id="method.foo"]' 'fn foo(&self)'
+// @!has - '//*[@id="static_foo.v"]' 'fn static_foo()'
 // @!has - '//*[@id="method.static_foo"]' 'fn static_foo()'

src/test/rustdoc/issue-35169-2.rs

@@ -34,10 +34,17 @@ impl DerefMut for Bar {
 }
 
 // @has issue_35169_2/struct.Bar.html
+// @has - '//*[@id="by_ref.v"]' 'fn by_ref(&self)'
 // @has - '//*[@id="method.by_ref"]' 'fn by_ref(&self)'
+// @has - '//*[@id="by_explicit_ref.v"]' 'fn by_explicit_ref(self: &Foo)'
 // @has - '//*[@id="method.by_explicit_ref"]' 'fn by_explicit_ref(self: &Foo)'
+// @has - '//*[@id="by_mut_ref.v"]' 'fn by_mut_ref(&mut self)'
 // @has - '//*[@id="method.by_mut_ref"]' 'fn by_mut_ref(&mut self)'
+// @has - '//*[@id="by_explicit_mut_ref.v"]' 'fn by_explicit_mut_ref(self: &mut Foo)'
 // @has - '//*[@id="method.by_explicit_mut_ref"]' 'fn by_explicit_mut_ref(self: &mut Foo)'
+// @!has - '//*[@id="by_explicit_box.v"]' 'fn by_explicit_box(self: Box<Foo>)'
 // @!has - '//*[@id="method.by_explicit_box"]' 'fn by_explicit_box(self: Box<Foo>)'
+// @!has - '//*[@id="by_explicit_self_box.v"]' 'fn by_explicit_self_box(self: Box<Self>)'
 // @!has - '//*[@id="method.by_explicit_self_box"]' 'fn by_explicit_self_box(self: Box<Self>)'
+// @!has - '//*[@id="static_foo.v"]' 'fn static_foo()'
 // @!has - '//*[@id="method.static_foo"]' 'fn static_foo()'

src/test/rustdoc/issue-35169.rs

@@ -29,10 +29,17 @@ impl Deref for Bar {
 }
 
 // @has issue_35169/struct.Bar.html
+// @has - '//*[@id="by_ref.v"]' 'fn by_ref(&self)'
 // @has - '//*[@id="method.by_ref"]' 'fn by_ref(&self)'
+// @has - '//*[@id="by_explicit_ref.v"]' 'fn by_explicit_ref(self: &Foo)'
 // @has - '//*[@id="method.by_explicit_ref"]' 'fn by_explicit_ref(self: &Foo)'
+// @!has - '//*[@id="by_mut_ref.v"]' 'fn by_mut_ref(&mut self)'
 // @!has - '//*[@id="method.by_mut_ref"]' 'fn by_mut_ref(&mut self)'
+// @!has - '//*[@id="by_explicit_mut_ref.v"]' 'fn by_explicit_mut_ref(self: &mut Foo)'
 // @!has - '//*[@id="method.by_explicit_mut_ref"]' 'fn by_explicit_mut_ref(self: &mut Foo)'
+// @!has - '//*[@id="by_explicit_box.v"]' 'fn by_explicit_box(self: Box<Foo>)'
 // @!has - '//*[@id="method.by_explicit_box"]' 'fn by_explicit_box(self: Box<Foo>)'
+// @!has - '//*[@id="by_explicit_self_box.v"]' 'fn by_explicit_self_box(self: Box<Self>)'
 // @!has - '//*[@id="method.by_explicit_self_box"]' 'fn by_explicit_self_box(self: Box<Self>)'
+// @!has - '//*[@id="static_foo.v"]' 'fn static_foo()'
 // @!has - '//*[@id="method.static_foo"]' 'fn static_foo()'

src/test/rustdoc/structfields.rs

@@ -8,6 +8,10 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// compile-flags:--generate-redirect-pages
+
+// @has structfields/Foo.t.html
+// @has - struct.Foo.html
 // @has structfields/struct.Foo.html
 pub struct Foo {
     // @has - //pre "pub a: ()"
@@ -22,13 +26,17 @@ pub struct Foo {
     pub d: usize,
 }
 
+// @has structfields/Bar.t.html
+// @has - struct.Bar.html
 // @has structfields/struct.Bar.html
 pub struct Bar {
     // @has - //pre "pub a: ()"
     pub a: (),
     // @!has - //pre "// some fields omitted"
 }
 
+// @has structfields/Qux.t.html
+// @has - enum.Qux.html
 // @has structfields/enum.Qux.html
 pub enum Qux {
     Quz {