src/bootstrap/doc.rs

   1 //! Documentation generation for rustbuilder.
   2 //!
   3 //! This module implements generation for all bits and pieces of documentation
   4 //! for the Rust project. This notably includes suites like the rust book, the
   5 //! nomicon, rust by example, standalone documentation, etc.
   6 //!
   7 //! Everything here is basically just a shim around calling either `rustbook` or
   8 //! `rustdoc`.
   9
  10 use std::collections::HashSet;
  11 use std::fs;
  12 use std::io;
  13 use std::path::{Path, PathBuf};
  14
  15 use crate::Mode;
  16 use build_helper::{t, up_to_date};
  17
  18 use crate::builder::{Builder, Compiler, RunConfig, ShouldRun, Step};
  19 use crate::cache::{Interned, INTERNER};
  20 use crate::compile;
  21 use crate::config::{Config, TargetSelection};
  22 use crate::tool::{self, prepare_tool_cargo, SourceType, Tool};
  23 use crate::util::symlink_dir;
  24
  25 macro_rules! book {
  26     ($($name:ident, $path:expr, $book_name:expr;)+) => {
  27         $(
  28             #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
  29         pub struct $name {
  30             target: TargetSelection,
  31         }
  32
  33         impl Step for $name {
  34             type Output = ();
  35             const DEFAULT: bool = true;
  36
  37             fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
  38                 let builder = run.builder;
  39                 run.path($path).default_condition(builder.config.docs)
  40             }
  41
  42             fn make_run(run: RunConfig<'_>) {
  43                 run.builder.ensure($name {
  44                     target: run.target,
  45                 });
  46             }
  47
  48             fn run(self, builder: &Builder<'_>) {
  49                 builder.ensure(RustbookSrc {
  50                     target: self.target,
  51                     name: INTERNER.intern_str($book_name),
  52                     src: INTERNER.intern_path(builder.src.join($path)),
  53                 })
  54             }
  55         }
  56         )+
  57     }
  58 }
  59
  60 // NOTE: When adding a book here, make sure to ALSO build the book by
  61 // adding a build step in `src/bootstrap/builder.rs`!
  62 book!(
  63     CargoBook, "src/tools/cargo/src/doc", "cargo";
  64     EditionGuide, "src/doc/edition-guide", "edition-guide";
  65     EmbeddedBook, "src/doc/embedded-book", "embedded-book";
  66     Nomicon, "src/doc/nomicon", "nomicon";
  67     Reference, "src/doc/reference", "reference";
  68     RustByExample, "src/doc/rust-by-example", "rust-by-example";
  69     RustdocBook, "src/doc/rustdoc", "rustdoc";
  70 );
  71
  72 fn open(builder: &Builder<'_>, path: impl AsRef<Path>) {
  73     if builder.config.dry_run || !builder.config.cmd.open() {
  74         return;
  75     }
  76
  77     let path = path.as_ref();
  78     builder.info(&format!("Opening doc {}", path.display()));
  79     if let Err(err) = opener::open(path) {
  80         builder.info(&format!("{}\n", err));
  81     }
  82 }
  83
  84 // "library/std" -> ["library", "std"]
  85 //
  86 // Used for deciding whether a particular step is one requested by the user on
  87 // the `x.py doc` command line, which determines whether `--open` will open that
  88 // page.
  89 fn components_simplified(path: &PathBuf) -> Vec<&str> {
  90     path.iter().map(|component| component.to_str().unwrap_or("???")).collect()
  91 }
  92
  93 fn is_explicit_request(builder: &Builder<'_>, path: &str) -> bool {
  94     builder
  95         .paths
  96         .iter()
  97         .map(components_simplified)
  98         .any(|requested| requested.iter().copied().eq(path.split('/')))
  99 }
 100
 101 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 102 pub struct UnstableBook {
 103     target: TargetSelection,
 104 }
 105
 106 impl Step for UnstableBook {
 107     type Output = ();
 108     const DEFAULT: bool = true;
 109
 110     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 111         let builder = run.builder;
 112         run.path("src/doc/unstable-book").default_condition(builder.config.docs)
 113     }
 114
 115     fn make_run(run: RunConfig<'_>) {
 116         run.builder.ensure(UnstableBook { target: run.target });
 117     }
 118
 119     fn run(self, builder: &Builder<'_>) {
 120         builder.ensure(UnstableBookGen { target: self.target });
 121         builder.ensure(RustbookSrc {
 122             target: self.target,
 123             name: INTERNER.intern_str("unstable-book"),
 124             src: INTERNER.intern_path(builder.md_doc_out(self.target).join("unstable-book")),
 125         })
 126     }
 127 }
 128
 129 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 130 struct RustbookSrc {
 131     target: TargetSelection,
 132     name: Interned<String>,
 133     src: Interned<PathBuf>,
 134 }
 135
 136 impl Step for RustbookSrc {
 137     type Output = ();
 138
 139     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 140         run.never()
 141     }
 142
 143     /// Invoke `rustbook` for `target` for the doc book `name` from the `src` path.
 144     ///
 145     /// This will not actually generate any documentation if the documentation has
 146     /// already been generated.
 147     fn run(self, builder: &Builder<'_>) {
 148         let target = self.target;
 149         let name = self.name;
 150         let src = self.src;
 151         let out = builder.doc_out(target);
 152         t!(fs::create_dir_all(&out));
 153
 154         let out = out.join(name);
 155         let index = out.join("index.html");
 156         let rustbook = builder.tool_exe(Tool::Rustbook);
 157         let mut rustbook_cmd = builder.tool_cmd(Tool::Rustbook);
 158         if builder.config.dry_run || up_to_date(&src, &index) && up_to_date(&rustbook, &index) {
 159             return;
 160         }
 161         builder.info(&format!("Rustbook ({}) - {}", target, name));
 162         let _ = fs::remove_dir_all(&out);
 163
 164         builder.run(rustbook_cmd.arg("build").arg(&src).arg("-d").arg(out));
 165     }
 166 }
 167
 168 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 169 pub struct TheBook {
 170     compiler: Compiler,
 171     target: TargetSelection,
 172 }
 173
 174 impl Step for TheBook {
 175     type Output = ();
 176     const DEFAULT: bool = true;
 177
 178     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 179         let builder = run.builder;
 180         run.path("src/doc/book").default_condition(builder.config.docs)
 181     }
 182
 183     fn make_run(run: RunConfig<'_>) {
 184         run.builder.ensure(TheBook {
 185             compiler: run.builder.compiler(run.builder.top_stage, run.builder.config.build),
 186             target: run.target,
 187         });
 188     }
 189
 190     /// Builds the book and associated stuff.
 191     ///
 192     /// We need to build:
 193     ///
 194     /// * Book
 195     /// * Older edition redirects
 196     /// * Version info and CSS
 197     /// * Index page
 198     /// * Redirect pages
 199     fn run(self, builder: &Builder<'_>) {
 200         let compiler = self.compiler;
 201         let target = self.target;
 202
 203         // build book
 204         builder.ensure(RustbookSrc {
 205             target,
 206             name: INTERNER.intern_str("book"),
 207             src: INTERNER.intern_path(builder.src.join("src/doc/book")),
 208         });
 209
 210         // building older edition redirects
 211         for edition in &["first-edition", "second-edition", "2018-edition"] {
 212             builder.ensure(RustbookSrc {
 213                 target,
 214                 name: INTERNER.intern_string(format!("book/{}", edition)),
 215                 src: INTERNER.intern_path(builder.src.join("src/doc/book").join(edition)),
 216             });
 217         }
 218
 219         // build the version info page and CSS
 220         builder.ensure(Standalone { compiler, target });
 221
 222         // build the redirect pages
 223         builder.info(&format!("Documenting book redirect pages ({})", target));
 224         for file in t!(fs::read_dir(builder.src.join("src/doc/book/redirects"))) {
 225             let file = t!(file);
 226             let path = file.path();
 227             let path = path.to_str().unwrap();
 228
 229             invoke_rustdoc(builder, compiler, target, path);
 230         }
 231
 232         if is_explicit_request(builder, "src/doc/book") {
 233             let out = builder.doc_out(target);
 234             let index = out.join("book").join("index.html");
 235             open(builder, &index);
 236         }
 237     }
 238 }
 239
 240 fn invoke_rustdoc(
 241     builder: &Builder<'_>,
 242     compiler: Compiler,
 243     target: TargetSelection,
 244     markdown: &str,
 245 ) {
 246     let out = builder.doc_out(target);
 247
 248     let path = builder.src.join("src/doc").join(markdown);
 249
 250     let header = builder.src.join("src/doc/redirect.inc");
 251     let footer = builder.src.join("src/doc/footer.inc");
 252     let version_info = out.join("version_info.html");
 253
 254     let mut cmd = builder.rustdoc_cmd(compiler);
 255
 256     let out = out.join("book");
 257
 258     cmd.arg("--html-after-content")
 259         .arg(&footer)
 260         .arg("--html-before-content")
 261         .arg(&version_info)
 262         .arg("--html-in-header")
 263         .arg(&header)
 264         .arg("--markdown-no-toc")
 265         .arg("--markdown-playground-url")
 266         .arg("https://play.rust-lang.org/")
 267         .arg("-o")
 268         .arg(&out)
 269         .arg(&path)
 270         .arg("--markdown-css")
 271         .arg("../rust.css");
 272
 273     builder.run(&mut cmd);
 274 }
 275
 276 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 277 pub struct Standalone {
 278     compiler: Compiler,
 279     target: TargetSelection,
 280 }
 281
 282 impl Step for Standalone {
 283     type Output = ();
 284     const DEFAULT: bool = true;
 285
 286     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 287         let builder = run.builder;
 288         run.path("src/doc").default_condition(builder.config.docs)
 289     }
 290
 291     fn make_run(run: RunConfig<'_>) {
 292         run.builder.ensure(Standalone {
 293             compiler: run.builder.compiler(run.builder.top_stage, run.builder.config.build),
 294             target: run.target,
 295         });
 296     }
 297
 298     /// Generates all standalone documentation as compiled by the rustdoc in `stage`
 299     /// for the `target` into `out`.
 300     ///
 301     /// This will list all of `src/doc` looking for markdown files and appropriately
 302     /// perform transformations like substituting `VERSION`, `SHORT_HASH`, and
 303     /// `STAMP` along with providing the various header/footer HTML we've customized.
 304     ///
 305     /// In the end, this is just a glorified wrapper around rustdoc!
 306     fn run(self, builder: &Builder<'_>) {
 307         let target = self.target;
 308         let compiler = self.compiler;
 309         builder.info(&format!("Documenting standalone ({})", target));
 310         let out = builder.doc_out(target);
 311         t!(fs::create_dir_all(&out));
 312
 313         let favicon = builder.src.join("src/doc/favicon.inc");
 314         let footer = builder.src.join("src/doc/footer.inc");
 315         let full_toc = builder.src.join("src/doc/full-toc.inc");
 316         t!(fs::copy(builder.src.join("src/doc/rust.css"), out.join("rust.css")));
 317
 318         let version_input = builder.src.join("src/doc/version_info.html.template");
 319         let version_info = out.join("version_info.html");
 320
 321         if !builder.config.dry_run && !up_to_date(&version_input, &version_info) {
 322             let info = t!(fs::read_to_string(&version_input))
 323                 .replace("VERSION", &builder.rust_release())
 324                 .replace("SHORT_HASH", builder.rust_info.sha_short().unwrap_or(""))
 325                 .replace("STAMP", builder.rust_info.sha().unwrap_or(""));
 326             t!(fs::write(&version_info, &info));
 327         }
 328
 329         for file in t!(fs::read_dir(builder.src.join("src/doc"))) {
 330             let file = t!(file);
 331             let path = file.path();
 332             let filename = path.file_name().unwrap().to_str().unwrap();
 333             if !filename.ends_with(".md") || filename == "README.md" {
 334                 continue;
 335             }
 336
 337             let html = out.join(filename).with_extension("html");
 338             let rustdoc = builder.rustdoc(compiler);
 339             if up_to_date(&path, &html)
 340                 && up_to_date(&footer, &html)
 341                 && up_to_date(&favicon, &html)
 342                 && up_to_date(&full_toc, &html)
 343                 && (builder.config.dry_run || up_to_date(&version_info, &html))
 344                 && (builder.config.dry_run || up_to_date(&rustdoc, &html))
 345             {
 346                 continue;
 347             }
 348
 349             let mut cmd = builder.rustdoc_cmd(compiler);
 350             // Needed for --index-page flag
 351             cmd.arg("-Z").arg("unstable-options");
 352
 353             cmd.arg("--html-after-content")
 354                 .arg(&footer)
 355                 .arg("--html-before-content")
 356                 .arg(&version_info)
 357                 .arg("--html-in-header")
 358                 .arg(&favicon)
 359                 .arg("--markdown-no-toc")
 360                 .arg("--index-page")
 361                 .arg(&builder.src.join("src/doc/index.md"))
 362                 .arg("--markdown-playground-url")
 363                 .arg("https://play.rust-lang.org/")
 364                 .arg("-o")
 365                 .arg(&out)
 366                 .arg(&path);
 367
 368             if filename == "not_found.md" {
 369                 cmd.arg("--markdown-css").arg("https://doc.rust-lang.org/rust.css");
 370             } else {
 371                 cmd.arg("--markdown-css").arg("rust.css");
 372             }
 373             builder.run(&mut cmd);
 374         }
 375
 376         // We open doc/index.html as the default if invoked as `x.py doc --open`
 377         // with no particular explicit doc requested (e.g. library/core).
 378         if builder.paths.is_empty() || is_explicit_request(builder, "src/doc") {
 379             let index = out.join("index.html");
 380             open(builder, &index);
 381         }
 382     }
 383 }
 384
 385 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 386 pub struct Std {
 387     pub stage: u32,
 388     pub target: TargetSelection,
 389 }
 390
 391 impl Step for Std {
 392     type Output = ();
 393     const DEFAULT: bool = true;
 394
 395     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 396         let builder = run.builder;
 397         run.all_krates("test").default_condition(builder.config.docs)
 398     }
 399
 400     fn make_run(run: RunConfig<'_>) {
 401         run.builder.ensure(Std { stage: run.builder.top_stage, target: run.target });
 402     }
 403
 404     /// Compile all standard library documentation.
 405     ///
 406     /// This will generate all documentation for the standard library and its
 407     /// dependencies. This is largely just a wrapper around `cargo doc`.
 408     fn run(self, builder: &Builder<'_>) {
 409         let stage = self.stage;
 410         let target = self.target;
 411         builder.info(&format!("Documenting stage{} std ({})", stage, target));
 412         let out = builder.doc_out(target);
 413         t!(fs::create_dir_all(&out));
 414         let compiler = builder.compiler(stage, builder.config.build);
 415
 416         builder.ensure(compile::Std { compiler, target });
 417         let out_dir = builder.stage_out(compiler, Mode::Std).join(target.triple).join("doc");
 418
 419         t!(fs::copy(builder.src.join("src/doc/rust.css"), out.join("rust.css")));
 420
 421         let run_cargo_rustdoc_for = |package: &str| {
 422             let mut cargo =
 423                 builder.cargo(compiler, Mode::Std, SourceType::InTree, target, "rustdoc");
 424             compile::std_cargo(builder, target, compiler.stage, &mut cargo);
 425
 426             cargo
 427                 .arg("-p")
 428                 .arg(package)
 429                 .arg("--")
 430                 .arg("--markdown-css")
 431                 .arg("rust.css")
 432                 .arg("--markdown-no-toc")
 433                 .arg("-Z")
 434                 .arg("unstable-options")
 435                 .arg("--resource-suffix")
 436                 .arg(&builder.version)
 437                 .arg("--index-page")
 438                 .arg(&builder.src.join("src/doc/index.md"));
 439
 440             builder.run(&mut cargo.into());
 441         };
 442         // Only build the following crates. While we could just iterate over the
 443         // folder structure, that would also build internal crates that we do
 444         // not want to show in documentation. These crates will later be visited
 445         // by the rustc step, so internal documentation will show them.
 446         //
 447         // Note that the order here is important! The crates need to be
 448         // processed starting from the leaves, otherwise rustdoc will not
 449         // create correct links between crates because rustdoc depends on the
 450         // existence of the output directories to know if it should be a local
 451         // or remote link.
 452         let krates = ["core", "alloc", "std", "proc_macro", "test"];
 453         for krate in &krates {
 454             run_cargo_rustdoc_for(krate);
 455         }
 456         builder.cp_r(&out_dir, &out);
 457
 458         // Look for library/std, library/core etc in the `x.py doc` arguments and
 459         // open the corresponding rendered docs.
 460         for path in builder.paths.iter().map(components_simplified) {
 461             if path.get(0) == Some(&"library") {
 462                 let requested_crate = &path[1];
 463                 if krates.contains(&requested_crate) {
 464                     let index = out.join(requested_crate).join("index.html");
 465                     open(builder, &index);
 466                 }
 467             }
 468         }
 469     }
 470 }
 471
 472 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 473 pub struct Rustc {
 474     stage: u32,
 475     target: TargetSelection,
 476 }
 477
 478 impl Step for Rustc {
 479     type Output = ();
 480     const DEFAULT: bool = true;
 481     const ONLY_HOSTS: bool = true;
 482
 483     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 484         let builder = run.builder;
 485         run.krate("rustc-main").default_condition(builder.config.docs)
 486     }
 487
 488     fn make_run(run: RunConfig<'_>) {
 489         run.builder.ensure(Rustc { stage: run.builder.top_stage, target: run.target });
 490     }
 491
 492     /// Generates compiler documentation.
 493     ///
 494     /// This will generate all documentation for compiler and dependencies.
 495     /// Compiler documentation is distributed separately, so we make sure
 496     /// we do not merge it with the other documentation from std, test and
 497     /// proc_macros. This is largely just a wrapper around `cargo doc`.
 498     fn run(self, builder: &Builder<'_>) {
 499         let stage = self.stage;
 500         let target = self.target;
 501         builder.info(&format!("Documenting stage{} compiler ({})", stage, target));
 502
 503         // This is the intended out directory for compiler documentation.
 504         let out = builder.compiler_doc_out(target);
 505         t!(fs::create_dir_all(&out));
 506
 507         let compiler = builder.compiler(stage, builder.config.build);
 508
 509         if !builder.config.compiler_docs {
 510             builder.info("\tskipping - compiler/librustdoc docs disabled");
 511             return;
 512         }
 513
 514         // Build rustc.
 515         builder.ensure(compile::Rustc { compiler, target });
 516
 517         // This uses a shared directory so that librustdoc documentation gets
 518         // correctly built and merged with the rustc documentation. This is
 519         // needed because rustdoc is built in a different directory from
 520         // rustc. rustdoc needs to be able to see everything, for example when
 521         // merging the search index, or generating local (relative) links.
 522         let out_dir = builder.stage_out(compiler, Mode::Rustc).join(target.triple).join("doc");
 523         t!(symlink_dir_force(&builder.config, &out, &out_dir));
 524
 525         // Build cargo command.
 526         let mut cargo = builder.cargo(compiler, Mode::Rustc, SourceType::InTree, target, "doc");
 527         cargo.rustdocflag("--document-private-items");
 528         cargo.rustdocflag("--enable-index-page");
 529         cargo.rustdocflag("-Zunstable-options");
 530         compile::rustc_cargo(builder, &mut cargo, target);
 531
 532         // Only include compiler crates, no dependencies of those, such as `libc`.
 533         cargo.arg("--no-deps");
 534
 535         // Find dependencies for top level crates.
 536         let mut compiler_crates = HashSet::new();
 537         for root_crate in &["rustc_driver", "rustc_codegen_llvm", "rustc_codegen_ssa"] {
 538             compiler_crates
 539                 .extend(builder.in_tree_crates(root_crate).into_iter().map(|krate| krate.name));
 540         }
 541
 542         for krate in &compiler_crates {
 543             // Create all crate output directories first to make sure rustdoc uses
 544             // relative links.
 545             // FIXME: Cargo should probably do this itself.
 546             t!(fs::create_dir_all(out_dir.join(krate)));
 547             cargo.arg("-p").arg(krate);
 548         }
 549
 550         builder.run(&mut cargo.into());
 551     }
 552 }
 553
 554 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 555 pub struct Rustdoc {
 556     stage: u32,
 557     target: TargetSelection,
 558 }
 559
 560 impl Step for Rustdoc {
 561     type Output = ();
 562     const DEFAULT: bool = true;
 563     const ONLY_HOSTS: bool = true;
 564
 565     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 566         run.krate("rustdoc-tool")
 567     }
 568
 569     fn make_run(run: RunConfig<'_>) {
 570         run.builder.ensure(Rustdoc { stage: run.builder.top_stage, target: run.target });
 571     }
 572
 573     /// Generates compiler documentation.
 574     ///
 575     /// This will generate all documentation for compiler and dependencies.
 576     /// Compiler documentation is distributed separately, so we make sure
 577     /// we do not merge it with the other documentation from std, test and
 578     /// proc_macros. This is largely just a wrapper around `cargo doc`.
 579     fn run(self, builder: &Builder<'_>) {
 580         let stage = self.stage;
 581         let target = self.target;
 582         builder.info(&format!("Documenting stage{} rustdoc ({})", stage, target));
 583
 584         // This is the intended out directory for compiler documentation.
 585         let out = builder.compiler_doc_out(target);
 586         t!(fs::create_dir_all(&out));
 587
 588         let compiler = builder.compiler(stage, builder.config.build);
 589
 590         if !builder.config.compiler_docs {
 591             builder.info("\tskipping - compiler/librustdoc docs disabled");
 592             return;
 593         }
 594
 595         // Build rustc docs so that we generate relative links.
 596         builder.ensure(Rustc { stage, target });
 597
 598         // Build rustdoc.
 599         builder.ensure(tool::Rustdoc { compiler });
 600
 601         // Symlink compiler docs to the output directory of rustdoc documentation.
 602         let out_dir = builder.stage_out(compiler, Mode::ToolRustc).join(target.triple).join("doc");
 603         t!(fs::create_dir_all(&out_dir));
 604         t!(symlink_dir_force(&builder.config, &out, &out_dir));
 605
 606         // Build cargo command.
 607         let mut cargo = prepare_tool_cargo(
 608             builder,
 609             compiler,
 610             Mode::ToolRustc,
 611             target,
 612             "doc",
 613             "src/tools/rustdoc",
 614             SourceType::InTree,
 615             &[],
 616         );
 617
 618         // Only include compiler crates, no dependencies of those, such as `libc`.
 619         cargo.arg("--no-deps");
 620         cargo.arg("-p").arg("rustdoc");
 621
 622         cargo.rustdocflag("--document-private-items");
 623         builder.run(&mut cargo.into());
 624     }
 625 }
 626
 627 #[derive(Ord, PartialOrd, Debug, Copy, Clone, Hash, PartialEq, Eq)]
 628 pub struct ErrorIndex {
 629     pub compiler: Compiler,
 630     pub target: TargetSelection,
 631 }
 632
 633 impl Step for ErrorIndex {
 634     type Output = ();
 635     const DEFAULT: bool = true;
 636     const ONLY_HOSTS: bool = true;
 637
 638     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 639         let builder = run.builder;
 640         run.path("src/tools/error_index_generator").default_condition(builder.config.docs)
 641     }
 642
 643     fn make_run(run: RunConfig<'_>) {
 644         let target = run.target;
 645         // error_index_generator depends on librustdoc. Use the compiler that
 646         // is normally used to build rustdoc for other documentation so that
 647         // it shares the same artifacts.
 648         let compiler =
 649             run.builder.compiler_for(run.builder.top_stage, run.builder.config.build, target);
 650         run.builder.ensure(ErrorIndex { compiler, target });
 651     }
 652
 653     /// Generates the HTML rendered error-index by running the
 654     /// `error_index_generator` tool.
 655     fn run(self, builder: &Builder<'_>) {
 656         builder.info(&format!("Documenting error index ({})", self.target));
 657         let out = builder.doc_out(self.target);
 658         t!(fs::create_dir_all(&out));
 659         let mut index = tool::ErrorIndex::command(builder, self.compiler);
 660         index.arg("html");
 661         index.arg(out.join("error-index.html"));
 662         index.arg(&builder.version);
 663
 664         builder.run(&mut index);
 665     }
 666 }
 667
 668 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 669 pub struct UnstableBookGen {
 670     target: TargetSelection,
 671 }
 672
 673 impl Step for UnstableBookGen {
 674     type Output = ();
 675     const DEFAULT: bool = true;
 676     const ONLY_HOSTS: bool = true;
 677
 678     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 679         let builder = run.builder;
 680         run.path("src/tools/unstable-book-gen").default_condition(builder.config.docs)
 681     }
 682
 683     fn make_run(run: RunConfig<'_>) {
 684         run.builder.ensure(UnstableBookGen { target: run.target });
 685     }
 686
 687     fn run(self, builder: &Builder<'_>) {
 688         let target = self.target;
 689
 690         builder.info(&format!("Generating unstable book md files ({})", target));
 691         let out = builder.md_doc_out(target).join("unstable-book");
 692         builder.create_dir(&out);
 693         builder.remove_dir(&out);
 694         let mut cmd = builder.tool_cmd(Tool::UnstableBookGen);
 695         cmd.arg(builder.src.join("library"));
 696         cmd.arg(builder.src.join("compiler"));
 697         cmd.arg(builder.src.join("src"));
 698         cmd.arg(out);
 699
 700         builder.run(&mut cmd);
 701     }
 702 }
 703
 704 fn symlink_dir_force(config: &Config, src: &Path, dst: &Path) -> io::Result<()> {
 705     if config.dry_run {
 706         return Ok(());
 707     }
 708     if let Ok(m) = fs::symlink_metadata(dst) {
 709         if m.file_type().is_dir() {
 710             fs::remove_dir_all(dst)?;
 711         } else {
 712             // handle directory junctions on windows by falling back to
 713             // `remove_dir`.
 714             fs::remove_file(dst).or_else(|_| fs::remove_dir(dst))?;
 715         }
 716     }
 717
 718     symlink_dir(config, src, dst)
 719 }
 720
 721 #[derive(Ord, PartialOrd, Debug, Copy, Clone, Hash, PartialEq, Eq)]
 722 pub struct RustcBook {
 723     pub compiler: Compiler,
 724     pub target: TargetSelection,
 725 }
 726
 727 impl Step for RustcBook {
 728     type Output = ();
 729     const DEFAULT: bool = true;
 730     const ONLY_HOSTS: bool = true;
 731
 732     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
 733         let builder = run.builder;
 734         run.path("src/doc/rustc").default_condition(builder.config.docs)
 735     }
 736
 737     fn make_run(run: RunConfig<'_>) {
 738         run.builder.ensure(RustcBook {
 739             compiler: run.builder.compiler(run.builder.top_stage, run.builder.config.build),
 740             target: run.target,
 741         });
 742     }
 743
 744     /// Builds the rustc book.
 745     ///
 746     /// The lints are auto-generated by a tool, and then merged into the book
 747     /// in the "md-doc" directory in the build output directory. Then
 748     /// "rustbook" is used to convert it to HTML.
 749     fn run(self, builder: &Builder<'_>) {
 750         let out_base = builder.md_doc_out(self.target).join("rustc");
 751         t!(fs::create_dir_all(&out_base));
 752         let out_listing = out_base.join("src/lints");
 753         builder.cp_r(&builder.src.join("src/doc/rustc"), &out_base);
 754         builder.info(&format!("Generating lint docs ({})", self.target));
 755
 756         let rustc = builder.rustc(self.compiler);
 757         // The tool runs `rustc` for extracting output examples, so it needs a
 758         // functional sysroot.
 759         builder.ensure(compile::Std { compiler: self.compiler, target: self.target });
 760         let mut cmd = builder.tool_cmd(Tool::LintDocs);
 761         cmd.arg("--src");
 762         cmd.arg(builder.src.join("compiler"));
 763         cmd.arg("--out");
 764         cmd.arg(&out_listing);
 765         cmd.arg("--rustc");
 766         cmd.arg(&rustc);
 767         cmd.arg("--rustc-target").arg(&self.target.rustc_target_arg());
 768         if builder.config.verbose() {
 769             cmd.arg("--verbose");
 770         }
 771         // If the lib directories are in an unusual location (changed in
 772         // config.toml), then this needs to explicitly update the dylib search
 773         // path.
 774         builder.add_rustc_lib_path(self.compiler, &mut cmd);
 775         builder.run(&mut cmd);
 776         // Run rustbook/mdbook to generate the HTML pages.
 777         builder.ensure(RustbookSrc {
 778             target: self.target,
 779             name: INTERNER.intern_str("rustc"),
 780             src: INTERNER.intern_path(out_base),
 781         });
 782         if is_explicit_request(builder, "src/doc/rustc") {
 783             let out = builder.doc_out(self.target);
 784             let index = out.join("rustc").join("index.html");
 785             open(builder, &index);
 786         }
 787     }
 788 }