src/bootstrap/doc.rs

   1 // Copyright 2016 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 //! Documentation generation for rustbuilder.
  12 //!
  13 //! This module implements generation for all bits and pieces of documentation
  14 //! for the Rust project. This notably includes suites like the rust book, the
  15 //! nomicon, rust by example, standalone documentation, etc.
  16 //!
  17 //! Everything here is basically just a shim around calling either `rustbook` or
  18 //! `rustdoc`.
  19
  20 use std::collections::HashSet;
  21 use std::fs::{self, File};
  22 use std::io::prelude::*;
  23 use std::io;
  24 use std::path::{PathBuf, Path};
  25
  26 use Mode;
  27 use build_helper::up_to_date;
  28
  29 use util::symlink_dir;
  30 use builder::{Builder, Compiler, RunConfig, ShouldRun, Step};
  31 use tool::Tool;
  32 use compile;
  33 use cache::{INTERNER, Interned};
  34 use config::Config;
  35
  36 macro_rules! book {
  37     ($($name:ident, $path:expr, $book_name:expr;)+) => {
  38         $(
  39             #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
  40         pub struct $name {
  41             target: Interned<String>,
  42         }
  43
  44         impl Step for $name {
  45             type Output = ();
  46             const DEFAULT: bool = true;
  47
  48             fn should_run(run: ShouldRun) -> ShouldRun {
  49                 let builder = run.builder;
  50                 run.path($path).default_condition(builder.config.docs)
  51             }
  52
  53             fn make_run(run: RunConfig) {
  54                 run.builder.ensure($name {
  55                     target: run.target,
  56                 });
  57             }
  58
  59             fn run(self, builder: &Builder) {
  60                 builder.ensure(Rustbook {
  61                     target: self.target,
  62                     name: INTERNER.intern_str($book_name),
  63                 })
  64             }
  65         }
  66         )+
  67     }
  68 }
  69
  70 book!(
  71     Nomicon, "src/doc/nomicon", "nomicon";
  72     Reference, "src/doc/reference", "reference";
  73     Rustdoc, "src/doc/rustdoc", "rustdoc";
  74     RustcBook, "src/doc/rustc", "rustc";
  75     RustByExample, "src/doc/rust-by-example", "rust-by-example";
  76 );
  77
  78 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
  79 struct Rustbook {
  80     target: Interned<String>,
  81     name: Interned<String>,
  82 }
  83
  84 impl Step for Rustbook {
  85     type Output = ();
  86
  87     // rustbook is never directly called, and only serves as a shim for the nomicon and the
  88     // reference.
  89     fn should_run(run: ShouldRun) -> ShouldRun {
  90         run.never()
  91     }
  92
  93     /// Invoke `rustbook` for `target` for the doc book `name`.
  94     ///
  95     /// This will not actually generate any documentation if the documentation has
  96     /// already been generated.
  97     fn run(self, builder: &Builder) {
  98         let src = builder.src.join("src/doc");
  99         builder.ensure(RustbookSrc {
 100             target: self.target,
 101             name: self.name,
 102             src: INTERNER.intern_path(src),
 103         });
 104     }
 105 }
 106
 107 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 108 pub struct UnstableBook {
 109     target: Interned<String>,
 110 }
 111
 112 impl Step for UnstableBook {
 113     type Output = ();
 114     const DEFAULT: bool = true;
 115
 116     fn should_run(run: ShouldRun) -> ShouldRun {
 117         let builder = run.builder;
 118         run.path("src/doc/unstable-book").default_condition(builder.config.docs)
 119     }
 120
 121     fn make_run(run: RunConfig) {
 122         run.builder.ensure(UnstableBook {
 123             target: run.target,
 124         });
 125     }
 126
 127     fn run(self, builder: &Builder) {
 128         builder.ensure(UnstableBookGen {
 129             target: self.target,
 130         });
 131         builder.ensure(RustbookSrc {
 132             target: self.target,
 133             name: INTERNER.intern_str("unstable-book"),
 134             src: builder.md_doc_out(self.target),
 135         })
 136     }
 137 }
 138
 139 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 140 pub struct CargoBook {
 141     target: Interned<String>,
 142     name: Interned<String>,
 143 }
 144
 145 impl Step for CargoBook {
 146     type Output = ();
 147     const DEFAULT: bool = true;
 148
 149     fn should_run(run: ShouldRun) -> ShouldRun {
 150         let builder = run.builder;
 151         run.path("src/tools/cargo/src/doc/book").default_condition(builder.config.docs)
 152     }
 153
 154     fn make_run(run: RunConfig) {
 155         run.builder.ensure(CargoBook {
 156             target: run.target,
 157             name: INTERNER.intern_str("cargo"),
 158         });
 159     }
 160
 161     fn run(self, builder: &Builder) {
 162         let target = self.target;
 163         let name = self.name;
 164         let src = builder.src.join("src/tools/cargo/src/doc");
 165
 166         let out = builder.doc_out(target);
 167         t!(fs::create_dir_all(&out));
 168
 169         let out = out.join(name);
 170
 171         builder.info(&format!("Cargo Book ({}) - {}", target, name));
 172
 173         let _ = fs::remove_dir_all(&out);
 174
 175         builder.run(builder.tool_cmd(Tool::Rustbook)
 176                        .arg("build")
 177                        .arg(&src)
 178                        .arg("-d")
 179                        .arg(out));
 180     }
 181 }
 182
 183 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 184 struct RustbookSrc {
 185     target: Interned<String>,
 186     name: Interned<String>,
 187     src: Interned<PathBuf>,
 188 }
 189
 190 impl Step for RustbookSrc {
 191     type Output = ();
 192
 193     fn should_run(run: ShouldRun) -> ShouldRun {
 194         run.never()
 195     }
 196
 197     /// Invoke `rustbook` for `target` for the doc book `name` from the `src` path.
 198     ///
 199     /// This will not actually generate any documentation if the documentation has
 200     /// already been generated.
 201     fn run(self, builder: &Builder) {
 202         let target = self.target;
 203         let name = self.name;
 204         let src = self.src;
 205         let out = builder.doc_out(target);
 206         t!(fs::create_dir_all(&out));
 207
 208         let out = out.join(name);
 209         let src = src.join(name);
 210         let index = out.join("index.html");
 211         let rustbook = builder.tool_exe(Tool::Rustbook);
 212         let mut rustbook_cmd = builder.tool_cmd(Tool::Rustbook);
 213         if up_to_date(&src, &index) && up_to_date(&rustbook, &index) {
 214             return
 215         }
 216         builder.info(&format!("Rustbook ({}) - {}", target, name));
 217         let _ = fs::remove_dir_all(&out);
 218         builder.run(rustbook_cmd
 219                        .arg("build")
 220                        .arg(&src)
 221                        .arg("-d")
 222                        .arg(out));
 223     }
 224 }
 225
 226 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 227 pub struct TheBook {
 228     compiler: Compiler,
 229     target: Interned<String>,
 230     name: &'static str,
 231 }
 232
 233 impl Step for TheBook {
 234     type Output = ();
 235     const DEFAULT: bool = true;
 236
 237     fn should_run(run: ShouldRun) -> ShouldRun {
 238         let builder = run.builder;
 239         run.path("src/doc/book").default_condition(builder.config.docs)
 240     }
 241
 242     fn make_run(run: RunConfig) {
 243         run.builder.ensure(TheBook {
 244             compiler: run.builder.compiler(run.builder.top_stage, run.builder.config.build),
 245             target: run.target,
 246             name: "book",
 247         });
 248     }
 249
 250     /// Build the book and associated stuff.
 251     ///
 252     /// We need to build:
 253     ///
 254     /// * Book (first edition)
 255     /// * Book (second edition)
 256     /// * Version info and CSS
 257     /// * Index page
 258     /// * Redirect pages
 259     fn run(self, builder: &Builder) {
 260         let compiler = self.compiler;
 261         let target = self.target;
 262         let name = self.name;
 263         // build book first edition
 264         builder.ensure(Rustbook {
 265             target,
 266             name: INTERNER.intern_string(format!("{}/first-edition", name)),
 267         });
 268
 269         // build book second edition
 270         builder.ensure(Rustbook {
 271             target,
 272             name: INTERNER.intern_string(format!("{}/second-edition", name)),
 273         });
 274
 275         // build the version info page and CSS
 276         builder.ensure(Standalone {
 277             compiler,
 278             target,
 279         });
 280
 281         // build the index page
 282         let index = format!("{}/index.md", name);
 283         builder.info(&format!("Documenting book index ({})", target));
 284         invoke_rustdoc(builder, compiler, target, &index);
 285
 286         // build the redirect pages
 287         builder.info(&format!("Documenting book redirect pages ({})", target));
 288         for file in t!(fs::read_dir(builder.src.join("src/doc/book/redirects"))) {
 289             let file = t!(file);
 290             let path = file.path();
 291             let path = path.to_str().unwrap();
 292
 293             invoke_rustdoc(builder, compiler, target, path);
 294         }
 295     }
 296 }
 297
 298 fn invoke_rustdoc(builder: &Builder, compiler: Compiler, target: Interned<String>, markdown: &str) {
 299     let out = builder.doc_out(target);
 300
 301     let path = builder.src.join("src/doc").join(markdown);
 302
 303     let favicon = builder.src.join("src/doc/favicon.inc");
 304     let footer = builder.src.join("src/doc/footer.inc");
 305     let version_info = out.join("version_info.html");
 306
 307     let mut cmd = builder.rustdoc_cmd(compiler.host);
 308
 309     let out = out.join("book");
 310
 311     cmd.arg("--html-after-content").arg(&footer)
 312         .arg("--html-before-content").arg(&version_info)
 313         .arg("--html-in-header").arg(&favicon)
 314         .arg("--markdown-no-toc")
 315         .arg("--markdown-playground-url")
 316         .arg("https://play.rust-lang.org/")
 317         .arg("-o").arg(&out)
 318         .arg(&path)
 319         .arg("--markdown-css")
 320         .arg("../rust.css");
 321
 322     builder.run(&mut cmd);
 323 }
 324
 325 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 326 pub struct Standalone {
 327     compiler: Compiler,
 328     target: Interned<String>,
 329 }
 330
 331 impl Step for Standalone {
 332     type Output = ();
 333     const DEFAULT: bool = true;
 334
 335     fn should_run(run: ShouldRun) -> ShouldRun {
 336         let builder = run.builder;
 337         run.path("src/doc").default_condition(builder.config.docs)
 338     }
 339
 340     fn make_run(run: RunConfig) {
 341         run.builder.ensure(Standalone {
 342             compiler: run.builder.compiler(run.builder.top_stage, run.builder.config.build),
 343             target: run.target,
 344         });
 345     }
 346
 347     /// Generates all standalone documentation as compiled by the rustdoc in `stage`
 348     /// for the `target` into `out`.
 349     ///
 350     /// This will list all of `src/doc` looking for markdown files and appropriately
 351     /// perform transformations like substituting `VERSION`, `SHORT_HASH`, and
 352     /// `STAMP` along with providing the various header/footer HTML we've customized.
 353     ///
 354     /// In the end, this is just a glorified wrapper around rustdoc!
 355     fn run(self, builder: &Builder) {
 356         let target = self.target;
 357         let compiler = self.compiler;
 358         builder.info(&format!("Documenting standalone ({})", target));
 359         let out = builder.doc_out(target);
 360         t!(fs::create_dir_all(&out));
 361
 362         let favicon = builder.src.join("src/doc/favicon.inc");
 363         let footer = builder.src.join("src/doc/footer.inc");
 364         let full_toc = builder.src.join("src/doc/full-toc.inc");
 365         t!(fs::copy(builder.src.join("src/doc/rust.css"), out.join("rust.css")));
 366
 367         let version_input = builder.src.join("src/doc/version_info.html.template");
 368         let version_info = out.join("version_info.html");
 369
 370         if !builder.config.dry_run && !up_to_date(&version_input, &version_info) {
 371             let mut info = String::new();
 372             t!(t!(File::open(&version_input)).read_to_string(&mut info));
 373             let info = info.replace("VERSION", &builder.rust_release())
 374                            .replace("SHORT_HASH", builder.rust_info.sha_short().unwrap_or(""))
 375                            .replace("STAMP", builder.rust_info.sha().unwrap_or(""));
 376             t!(t!(File::create(&version_info)).write_all(info.as_bytes()));
 377         }
 378
 379         for file in t!(fs::read_dir(builder.src.join("src/doc"))) {
 380             let file = t!(file);
 381             let path = file.path();
 382             let filename = path.file_name().unwrap().to_str().unwrap();
 383             if !filename.ends_with(".md") || filename == "README.md" {
 384                 continue
 385             }
 386
 387             let html = out.join(filename).with_extension("html");
 388             let rustdoc = builder.rustdoc(compiler.host);
 389             if up_to_date(&path, &html) &&
 390                up_to_date(&footer, &html) &&
 391                up_to_date(&favicon, &html) &&
 392                up_to_date(&full_toc, &html) &&
 393                up_to_date(&version_info, &html) &&
 394                (builder.config.dry_run || up_to_date(&rustdoc, &html)) {
 395                 continue
 396             }
 397
 398             let mut cmd = builder.rustdoc_cmd(compiler.host);
 399             cmd.arg("--html-after-content").arg(&footer)
 400                .arg("--html-before-content").arg(&version_info)
 401                .arg("--html-in-header").arg(&favicon)
 402                .arg("--markdown-playground-url")
 403                .arg("https://play.rust-lang.org/")
 404                .arg("-o").arg(&out)
 405                .arg(&path);
 406
 407             if filename == "not_found.md" {
 408                 cmd.arg("--markdown-no-toc")
 409                    .arg("--markdown-css")
 410                    .arg("https://doc.rust-lang.org/rust.css");
 411             } else {
 412                 cmd.arg("--markdown-css").arg("rust.css");
 413             }
 414             builder.run(&mut cmd);
 415         }
 416     }
 417 }
 418
 419 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 420 pub struct Std {
 421     pub stage: u32,
 422     pub target: Interned<String>,
 423 }
 424
 425 impl Step for Std {
 426     type Output = ();
 427     const DEFAULT: bool = true;
 428
 429     fn should_run(run: ShouldRun) -> ShouldRun {
 430         let builder = run.builder;
 431         run.all_krates("std").default_condition(builder.config.docs)
 432     }
 433
 434     fn make_run(run: RunConfig) {
 435         run.builder.ensure(Std {
 436             stage: run.builder.top_stage,
 437             target: run.target
 438         });
 439     }
 440
 441     /// Compile all standard library documentation.
 442     ///
 443     /// This will generate all documentation for the standard library and its
 444     /// dependencies. This is largely just a wrapper around `cargo doc`.
 445     fn run(self, builder: &Builder) {
 446         let stage = self.stage;
 447         let target = self.target;
 448         builder.info(&format!("Documenting stage{} std ({})", stage, target));
 449         let out = builder.doc_out(target);
 450         t!(fs::create_dir_all(&out));
 451         let compiler = builder.compiler(stage, builder.config.build);
 452         let rustdoc = builder.rustdoc(compiler.host);
 453         let compiler = if builder.force_use_stage1(compiler, target) {
 454             builder.compiler(1, compiler.host)
 455         } else {
 456             compiler
 457         };
 458
 459         builder.ensure(compile::Std { compiler, target });
 460         let out_dir = builder.stage_out(compiler, Mode::Libstd)
 461                            .join(target).join("doc");
 462
 463         // Here what we're doing is creating a *symlink* (directory junction on
 464         // Windows) to the final output location. This is not done as an
 465         // optimization but rather for correctness. We've got three trees of
 466         // documentation, one for std, one for test, and one for rustc. It's then
 467         // our job to merge them all together.
 468         //
 469         // Unfortunately rustbuild doesn't know nearly as well how to merge doc
 470         // trees as rustdoc does itself, so instead of actually having three
 471         // separate trees we just have rustdoc output to the same location across
 472         // all of them.
 473         //
 474         // This way rustdoc generates output directly into the output, and rustdoc
 475         // will also directly handle merging.
 476         let my_out = builder.crate_doc_out(target);
 477         builder.clear_if_dirty(&my_out, &rustdoc);
 478         t!(symlink_dir_force(&builder.config, &my_out, &out_dir));
 479
 480         let mut cargo = builder.cargo(compiler, Mode::Libstd, target, "doc");
 481         compile::std_cargo(builder, &compiler, target, &mut cargo);
 482
 483         // Keep a whitelist so we do not build internal stdlib crates, these will be
 484         // build by the rustc step later if enabled.
 485         cargo.arg("--no-deps");
 486         for krate in &["alloc", "core", "std", "std_unicode"] {
 487             cargo.arg("-p").arg(krate);
 488             // Create all crate output directories first to make sure rustdoc uses
 489             // relative links.
 490             // FIXME: Cargo should probably do this itself.
 491             t!(fs::create_dir_all(out_dir.join(krate)));
 492         }
 493
 494         builder.run(&mut cargo);
 495         builder.cp_r(&my_out, &out);
 496     }
 497 }
 498
 499 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 500 pub struct Test {
 501     stage: u32,
 502     target: Interned<String>,
 503 }
 504
 505 impl Step for Test {
 506     type Output = ();
 507     const DEFAULT: bool = true;
 508
 509     fn should_run(run: ShouldRun) -> ShouldRun {
 510         let builder = run.builder;
 511         run.krate("test").default_condition(builder.config.docs)
 512     }
 513
 514     fn make_run(run: RunConfig) {
 515         run.builder.ensure(Test {
 516             stage: run.builder.top_stage,
 517             target: run.target,
 518         });
 519     }
 520
 521     /// Compile all libtest documentation.
 522     ///
 523     /// This will generate all documentation for libtest and its dependencies. This
 524     /// is largely just a wrapper around `cargo doc`.
 525     fn run(self, builder: &Builder) {
 526         let stage = self.stage;
 527         let target = self.target;
 528         builder.info(&format!("Documenting stage{} test ({})", stage, target));
 529         let out = builder.doc_out(target);
 530         t!(fs::create_dir_all(&out));
 531         let compiler = builder.compiler(stage, builder.config.build);
 532         let rustdoc = builder.rustdoc(compiler.host);
 533         let compiler = if builder.force_use_stage1(compiler, target) {
 534             builder.compiler(1, compiler.host)
 535         } else {
 536             compiler
 537         };
 538
 539         // Build libstd docs so that we generate relative links
 540         builder.ensure(Std { stage, target });
 541
 542         builder.ensure(compile::Test { compiler, target });
 543         let out_dir = builder.stage_out(compiler, Mode::Libtest)
 544                            .join(target).join("doc");
 545
 546         // See docs in std above for why we symlink
 547         let my_out = builder.crate_doc_out(target);
 548         builder.clear_if_dirty(&my_out, &rustdoc);
 549         t!(symlink_dir_force(&builder.config, &my_out, &out_dir));
 550
 551         let mut cargo = builder.cargo(compiler, Mode::Libtest, target, "doc");
 552         compile::test_cargo(builder, &compiler, target, &mut cargo);
 553
 554         cargo.arg("--no-deps").arg("-p").arg("test");
 555
 556         builder.run(&mut cargo);
 557         builder.cp_r(&my_out, &out);
 558     }
 559 }
 560
 561 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 562 pub struct WhitelistedRustc {
 563     stage: u32,
 564     target: Interned<String>,
 565 }
 566
 567 impl Step for WhitelistedRustc {
 568     type Output = ();
 569     const DEFAULT: bool = true;
 570     const ONLY_HOSTS: bool = true;
 571
 572     fn should_run(run: ShouldRun) -> ShouldRun {
 573         let builder = run.builder;
 574         run.krate("rustc-main").default_condition(builder.config.docs)
 575     }
 576
 577     fn make_run(run: RunConfig) {
 578         run.builder.ensure(WhitelistedRustc {
 579             stage: run.builder.top_stage,
 580             target: run.target,
 581         });
 582     }
 583
 584     /// Generate whitelisted compiler crate documentation.
 585     ///
 586     /// This will generate all documentation for crates that are whitelisted
 587     /// to be included in the standard documentation. This documentation is
 588     /// included in the standard Rust documentation, so we should always
 589     /// document it and symlink to merge with the rest of the std and test
 590     /// documentation. We don't build other compiler documentation
 591     /// here as we want to be able to keep it separate from the standard
 592     /// documentation. This is largely just a wrapper around `cargo doc`.
 593     fn run(self, builder: &Builder) {
 594         let stage = self.stage;
 595         let target = self.target;
 596         builder.info(&format!("Documenting stage{} whitelisted compiler ({})", stage, target));
 597         let out = builder.doc_out(target);
 598         t!(fs::create_dir_all(&out));
 599         let compiler = builder.compiler(stage, builder.config.build);
 600         let rustdoc = builder.rustdoc(compiler.host);
 601         let compiler = if builder.force_use_stage1(compiler, target) {
 602             builder.compiler(1, compiler.host)
 603         } else {
 604             compiler
 605         };
 606
 607         // Build libstd docs so that we generate relative links
 608         builder.ensure(Std { stage, target });
 609
 610         builder.ensure(compile::Rustc { compiler, target });
 611         let out_dir = builder.stage_out(compiler, Mode::Librustc)
 612                            .join(target).join("doc");
 613
 614         // See docs in std above for why we symlink
 615         let my_out = builder.crate_doc_out(target);
 616         builder.clear_if_dirty(&my_out, &rustdoc);
 617         t!(symlink_dir_force(&builder.config, &my_out, &out_dir));
 618
 619         let mut cargo = builder.cargo(compiler, Mode::Librustc, target, "doc");
 620         compile::rustc_cargo(builder, &mut cargo);
 621
 622         // We don't want to build docs for internal compiler dependencies in this
 623         // step (there is another step for that). Therefore, we whitelist the crates
 624         // for which docs must be built.
 625         cargo.arg("--no-deps");
 626         for krate in &["proc_macro"] {
 627             cargo.arg("-p").arg(krate);
 628         }
 629
 630         builder.run(&mut cargo);
 631         builder.cp_r(&my_out, &out);
 632     }
 633 }
 634
 635 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 636 pub struct Rustc {
 637     stage: u32,
 638     target: Interned<String>,
 639 }
 640
 641 impl Step for Rustc {
 642     type Output = ();
 643     const DEFAULT: bool = true;
 644     const ONLY_HOSTS: bool = true;
 645
 646     fn should_run(run: ShouldRun) -> ShouldRun {
 647         let builder = run.builder;
 648         run.krate("rustc-main").default_condition(builder.config.docs)
 649     }
 650
 651     fn make_run(run: RunConfig) {
 652         run.builder.ensure(Rustc {
 653             stage: run.builder.top_stage,
 654             target: run.target,
 655         });
 656     }
 657
 658     /// Generate compiler documentation.
 659     ///
 660     /// This will generate all documentation for compiler and dependencies.
 661     /// Compiler documentation is distributed separately, so we make sure
 662     /// we do not merge it with the other documentation from std, test and
 663     /// proc_macros. This is largely just a wrapper around `cargo doc`.
 664     fn run(self, builder: &Builder) {
 665         let stage = self.stage;
 666         let target = self.target;
 667         builder.info(&format!("Documenting stage{} compiler ({})", stage, target));
 668         let out = builder.compiler_doc_out(target);
 669         t!(fs::create_dir_all(&out));
 670         let compiler = builder.compiler(stage, builder.config.build);
 671         let rustdoc = builder.rustdoc(compiler.host);
 672         let compiler = if builder.force_use_stage1(compiler, target) {
 673             builder.compiler(1, compiler.host)
 674         } else {
 675             compiler
 676         };
 677
 678         if !builder.config.compiler_docs {
 679             builder.info(&format!("\tskipping - compiler docs disabled"));
 680             return;
 681         }
 682
 683         // Build libstd docs so that we generate relative links
 684         builder.ensure(Std { stage, target });
 685
 686         builder.ensure(compile::Rustc { compiler, target });
 687         let out_dir = builder.stage_out(compiler, Mode::Librustc)
 688                            .join(target).join("doc");
 689         // We do not symlink to the same shared folder that already contains std library
 690         // documentation from previous steps as we do not want to include that.
 691         builder.clear_if_dirty(&out, &rustdoc);
 692         t!(symlink_dir_force(&builder.config, &out, &out_dir));
 693
 694         let mut cargo = builder.cargo(compiler, Mode::Librustc, target, "doc");
 695         cargo.env("RUSTDOCFLAGS", "--document-private-items");
 696         compile::rustc_cargo(builder, &mut cargo);
 697
 698         // Only include compiler crates, no dependencies of those, such as `libc`.
 699         cargo.arg("--no-deps");
 700
 701         // Find dependencies for top level crates.
 702         let mut compiler_crates = HashSet::new();
 703         for root_crate in &["rustc", "rustc_driver"] {
 704             let interned_root_crate = INTERNER.intern_str(root_crate);
 705             find_compiler_crates(builder, &interned_root_crate, &mut compiler_crates);
 706         }
 707
 708         for krate in &compiler_crates {
 709             cargo.arg("-p").arg(krate);
 710         }
 711
 712         builder.run(&mut cargo);
 713     }
 714 }
 715
 716 fn find_compiler_crates(
 717     builder: &Builder,
 718     name: &Interned<String>,
 719     crates: &mut HashSet<Interned<String>>
 720 ) {
 721     // Add current crate.
 722     crates.insert(*name);
 723
 724     // Look for dependencies.
 725     for dep in builder.crates.get(name).unwrap().deps.iter() {
 726         if builder.crates.get(dep).unwrap().is_local(builder) {
 727             find_compiler_crates(builder, dep, crates);
 728         }
 729     }
 730 }
 731
 732 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 733 pub struct ErrorIndex {
 734     target: Interned<String>,
 735 }
 736
 737 impl Step for ErrorIndex {
 738     type Output = ();
 739     const DEFAULT: bool = true;
 740     const ONLY_HOSTS: bool = true;
 741
 742     fn should_run(run: ShouldRun) -> ShouldRun {
 743         let builder = run.builder;
 744         run.path("src/tools/error_index_generator").default_condition(builder.config.docs)
 745     }
 746
 747     fn make_run(run: RunConfig) {
 748         run.builder.ensure(ErrorIndex {
 749             target: run.target,
 750         });
 751     }
 752
 753     /// Generates the HTML rendered error-index by running the
 754     /// `error_index_generator` tool.
 755     fn run(self, builder: &Builder) {
 756         let target = self.target;
 757
 758         builder.info(&format!("Documenting error index ({})", target));
 759         let out = builder.doc_out(target);
 760         t!(fs::create_dir_all(&out));
 761         let mut index = builder.tool_cmd(Tool::ErrorIndex);
 762         index.arg("html");
 763         index.arg(out.join("error-index.html"));
 764
 765         // FIXME: shouldn't have to pass this env var
 766         index.env("CFG_BUILD", &builder.config.build)
 767              .env("RUSTC_ERROR_METADATA_DST", builder.extended_error_dir());
 768
 769         builder.run(&mut index);
 770     }
 771 }
 772
 773 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 774 pub struct UnstableBookGen {
 775     target: Interned<String>,
 776 }
 777
 778 impl Step for UnstableBookGen {
 779     type Output = ();
 780     const DEFAULT: bool = true;
 781     const ONLY_HOSTS: bool = true;
 782
 783     fn should_run(run: ShouldRun) -> ShouldRun {
 784         let builder = run.builder;
 785         run.path("src/tools/unstable-book-gen").default_condition(builder.config.docs)
 786     }
 787
 788     fn make_run(run: RunConfig) {
 789         run.builder.ensure(UnstableBookGen {
 790             target: run.target,
 791         });
 792     }
 793
 794     fn run(self, builder: &Builder) {
 795         let target = self.target;
 796
 797         builder.ensure(compile::Std {
 798             compiler: builder.compiler(builder.top_stage, builder.config.build),
 799             target,
 800         });
 801
 802         builder.info(&format!("Generating unstable book md files ({})", target));
 803         let out = builder.md_doc_out(target).join("unstable-book");
 804         builder.create_dir(&out);
 805         builder.remove_dir(&out);
 806         let mut cmd = builder.tool_cmd(Tool::UnstableBookGen);
 807         cmd.arg(builder.src.join("src"));
 808         cmd.arg(out);
 809
 810         builder.run(&mut cmd);
 811     }
 812 }
 813
 814 fn symlink_dir_force(config: &Config, src: &Path, dst: &Path) -> io::Result<()> {
 815     if config.dry_run {
 816         return Ok(());
 817     }
 818     if let Ok(m) = fs::symlink_metadata(dst) {
 819         if m.file_type().is_dir() {
 820             try!(fs::remove_dir_all(dst));
 821         } else {
 822             // handle directory junctions on windows by falling back to
 823             // `remove_dir`.
 824             try!(fs::remove_file(dst).or_else(|_| {
 825                 fs::remove_dir(dst)
 826             }));
 827         }
 828     }
 829
 830     symlink_dir(config, src, dst)
 831 }