src/librustdoc/config.rs

   1 use std::collections::BTreeMap;
   2 use std::convert::TryFrom;
   3 use std::ffi::OsStr;
   4 use std::fmt;
   5 use std::path::PathBuf;
   6 use std::str::FromStr;
   7
   8 use rustc_data_structures::fx::FxHashMap;
   9 use rustc_driver::print_flag_list;
  10 use rustc_session::config::{
  11     self, parse_crate_types_from_list, parse_externs, parse_target_triple, CrateType,
  12 };
  13 use rustc_session::config::{get_cmd_lint_options, nightly_options};
  14 use rustc_session::config::{
  15     CodegenOptions, ErrorOutputType, Externs, JsonUnusedExterns, UnstableOptions,
  16 };
  17 use rustc_session::getopts;
  18 use rustc_session::lint::Level;
  19 use rustc_session::search_paths::SearchPath;
  20 use rustc_span::edition::Edition;
  21 use rustc_target::spec::TargetTriple;
  22
  23 use crate::core::new_handler;
  24 use crate::externalfiles::ExternalHtml;
  25 use crate::html;
  26 use crate::html::markdown::IdMap;
  27 use crate::html::render::StylePath;
  28 use crate::html::static_files;
  29 use crate::opts;
  30 use crate::passes::{self, Condition};
  31 use crate::scrape_examples::{AllCallLocations, ScrapeExamplesOptions};
  32 use crate::theme;
  33
  34 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
  35 pub(crate) enum OutputFormat {
  36     Json,
  37     Html,
  38 }
  39
  40 impl Default for OutputFormat {
  41     fn default() -> OutputFormat {
  42         OutputFormat::Html
  43     }
  44 }
  45
  46 impl OutputFormat {
  47     pub(crate) fn is_json(&self) -> bool {
  48         matches!(self, OutputFormat::Json)
  49     }
  50 }
  51
  52 impl TryFrom<&str> for OutputFormat {
  53     type Error = String;
  54
  55     fn try_from(value: &str) -> Result<Self, Self::Error> {
  56         match value {
  57             "json" => Ok(OutputFormat::Json),
  58             "html" => Ok(OutputFormat::Html),
  59             _ => Err(format!("unknown output format `{}`", value)),
  60         }
  61     }
  62 }
  63
  64 /// Configuration options for rustdoc.
  65 #[derive(Clone)]
  66 pub(crate) struct Options {
  67     // Basic options / Options passed directly to rustc
  68     /// The crate root or Markdown file to load.
  69     pub(crate) input: PathBuf,
  70     /// The name of the crate being documented.
  71     pub(crate) crate_name: Option<String>,
  72     /// Whether or not this is a proc-macro crate
  73     pub(crate) proc_macro_crate: bool,
  74     /// How to format errors and warnings.
  75     pub(crate) error_format: ErrorOutputType,
  76     /// Width of output buffer to truncate errors appropriately.
  77     pub(crate) diagnostic_width: Option<usize>,
  78     /// Library search paths to hand to the compiler.
  79     pub(crate) libs: Vec<SearchPath>,
  80     /// Library search paths strings to hand to the compiler.
  81     pub(crate) lib_strs: Vec<String>,
  82     /// The list of external crates to link against.
  83     pub(crate) externs: Externs,
  84     /// The list of external crates strings to link against.
  85     pub(crate) extern_strs: Vec<String>,
  86     /// List of `cfg` flags to hand to the compiler. Always includes `rustdoc`.
  87     pub(crate) cfgs: Vec<String>,
  88     /// List of check cfg flags to hand to the compiler.
  89     pub(crate) check_cfgs: Vec<String>,
  90     /// Codegen options to hand to the compiler.
  91     pub(crate) codegen_options: CodegenOptions,
  92     /// Codegen options strings to hand to the compiler.
  93     pub(crate) codegen_options_strs: Vec<String>,
  94     /// Unstable (`-Z`) options to pass to the compiler.
  95     pub(crate) unstable_opts: UnstableOptions,
  96     /// Unstable (`-Z`) options strings to pass to the compiler.
  97     pub(crate) unstable_opts_strs: Vec<String>,
  98     /// The target used to compile the crate against.
  99     pub(crate) target: TargetTriple,
 100     /// Edition used when reading the crate. Defaults to "2015". Also used by default when
 101     /// compiling doctests from the crate.
 102     pub(crate) edition: Edition,
 103     /// The path to the sysroot. Used during the compilation process.
 104     pub(crate) maybe_sysroot: Option<PathBuf>,
 105     /// Lint information passed over the command-line.
 106     pub(crate) lint_opts: Vec<(String, Level)>,
 107     /// Whether to ask rustc to describe the lints it knows.
 108     pub(crate) describe_lints: bool,
 109     /// What level to cap lints at.
 110     pub(crate) lint_cap: Option<Level>,
 111
 112     // Options specific to running doctests
 113     /// Whether we should run doctests instead of generating docs.
 114     pub(crate) should_test: bool,
 115     /// List of arguments to pass to the test harness, if running tests.
 116     pub(crate) test_args: Vec<String>,
 117     /// The working directory in which to run tests.
 118     pub(crate) test_run_directory: Option<PathBuf>,
 119     /// Optional path to persist the doctest executables to, defaults to a
 120     /// temporary directory if not set.
 121     pub(crate) persist_doctests: Option<PathBuf>,
 122     /// Runtool to run doctests with
 123     pub(crate) runtool: Option<String>,
 124     /// Arguments to pass to the runtool
 125     pub(crate) runtool_args: Vec<String>,
 126     /// Whether to allow ignoring doctests on a per-target basis
 127     /// For example, using ignore-foo to ignore running the doctest on any target that
 128     /// contains "foo" as a substring
 129     pub(crate) enable_per_target_ignores: bool,
 130     /// Do not run doctests, compile them if should_test is active.
 131     pub(crate) no_run: bool,
 132
 133     /// The path to a rustc-like binary to build tests with. If not set, we
 134     /// default to loading from `$sysroot/bin/rustc`.
 135     pub(crate) test_builder: Option<PathBuf>,
 136
 137     // Options that affect the documentation process
 138     /// Whether to run the `calculate-doc-coverage` pass, which counts the number of public items
 139     /// with and without documentation.
 140     pub(crate) show_coverage: bool,
 141
 142     // Options that alter generated documentation pages
 143     /// Crate version to note on the sidebar of generated docs.
 144     pub(crate) crate_version: Option<String>,
 145     /// The format that we output when rendering.
 146     ///
 147     /// Currently used only for the `--show-coverage` option.
 148     pub(crate) output_format: OutputFormat,
 149     /// If this option is set to `true`, rustdoc will only run checks and not generate
 150     /// documentation.
 151     pub(crate) run_check: bool,
 152     /// Whether doctests should emit unused externs
 153     pub(crate) json_unused_externs: JsonUnusedExterns,
 154     /// Whether to skip capturing stdout and stderr of tests.
 155     pub(crate) nocapture: bool,
 156
 157     /// Configuration for scraping examples from the current crate. If this option is Some(..) then
 158     /// the compiler will scrape examples and not generate documentation.
 159     pub(crate) scrape_examples_options: Option<ScrapeExamplesOptions>,
 160
 161     /// Note: this field is duplicated in `RenderOptions` because it's useful
 162     /// to have it in both places.
 163     pub(crate) unstable_features: rustc_feature::UnstableFeatures,
 164 }
 165
 166 impl fmt::Debug for Options {
 167     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 168         struct FmtExterns<'a>(&'a Externs);
 169
 170         impl<'a> fmt::Debug for FmtExterns<'a> {
 171             fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 172                 f.debug_map().entries(self.0.iter()).finish()
 173             }
 174         }
 175
 176         f.debug_struct("Options")
 177             .field("input", &self.input)
 178             .field("crate_name", &self.crate_name)
 179             .field("proc_macro_crate", &self.proc_macro_crate)
 180             .field("error_format", &self.error_format)
 181             .field("libs", &self.libs)
 182             .field("externs", &FmtExterns(&self.externs))
 183             .field("cfgs", &self.cfgs)
 184             .field("check-cfgs", &self.check_cfgs)
 185             .field("codegen_options", &"...")
 186             .field("unstable_options", &"...")
 187             .field("target", &self.target)
 188             .field("edition", &self.edition)
 189             .field("maybe_sysroot", &self.maybe_sysroot)
 190             .field("lint_opts", &self.lint_opts)
 191             .field("describe_lints", &self.describe_lints)
 192             .field("lint_cap", &self.lint_cap)
 193             .field("should_test", &self.should_test)
 194             .field("test_args", &self.test_args)
 195             .field("test_run_directory", &self.test_run_directory)
 196             .field("persist_doctests", &self.persist_doctests)
 197             .field("show_coverage", &self.show_coverage)
 198             .field("crate_version", &self.crate_version)
 199             .field("runtool", &self.runtool)
 200             .field("runtool_args", &self.runtool_args)
 201             .field("enable-per-target-ignores", &self.enable_per_target_ignores)
 202             .field("run_check", &self.run_check)
 203             .field("no_run", &self.no_run)
 204             .field("nocapture", &self.nocapture)
 205             .field("scrape_examples_options", &self.scrape_examples_options)
 206             .field("unstable_features", &self.unstable_features)
 207             .finish()
 208     }
 209 }
 210
 211 /// Configuration options for the HTML page-creation process.
 212 #[derive(Clone, Debug)]
 213 pub(crate) struct RenderOptions {
 214     /// Output directory to generate docs into. Defaults to `doc`.
 215     pub(crate) output: PathBuf,
 216     /// External files to insert into generated pages.
 217     pub(crate) external_html: ExternalHtml,
 218     /// A pre-populated `IdMap` with the default headings and any headings added by Markdown files
 219     /// processed by `external_html`.
 220     pub(crate) id_map: IdMap,
 221     /// If present, playground URL to use in the "Run" button added to code samples.
 222     ///
 223     /// Be aware: This option can come both from the CLI and from crate attributes!
 224     pub(crate) playground_url: Option<String>,
 225     /// What sorting mode to use for module pages.
 226     /// `ModuleSorting::Alphabetical` by default.
 227     pub(crate) module_sorting: ModuleSorting,
 228     /// List of themes to extend the docs with. Original argument name is included to assist in
 229     /// displaying errors if it fails a theme check.
 230     pub(crate) themes: Vec<StylePath>,
 231     /// If present, CSS file that contains rules to add to the default CSS.
 232     pub(crate) extension_css: Option<PathBuf>,
 233     /// A map of crate names to the URL to use instead of querying the crate's `html_root_url`.
 234     pub(crate) extern_html_root_urls: BTreeMap<String, String>,
 235     /// Whether to give precedence to `html_root_url` or `--exten-html-root-url`.
 236     pub(crate) extern_html_root_takes_precedence: bool,
 237     /// A map of the default settings (values are as for DOM storage API). Keys should lack the
 238     /// `rustdoc-` prefix.
 239     pub(crate) default_settings: FxHashMap<String, String>,
 240     /// If present, suffix added to CSS/JavaScript files when referencing them in generated pages.
 241     pub(crate) resource_suffix: String,
 242     /// Whether to run the static CSS/JavaScript through a minifier when outputting them. `true` by
 243     /// default.
 244     pub(crate) enable_minification: bool,
 245     /// Whether to create an index page in the root of the output directory. If this is true but
 246     /// `enable_index_page` is None, generate a static listing of crates instead.
 247     pub(crate) enable_index_page: bool,
 248     /// A file to use as the index page at the root of the output directory. Overrides
 249     /// `enable_index_page` to be true if set.
 250     pub(crate) index_page: Option<PathBuf>,
 251     /// An optional path to use as the location of static files. If not set, uses combinations of
 252     /// `../` to reach the documentation root.
 253     pub(crate) static_root_path: Option<String>,
 254
 255     // Options specific to reading standalone Markdown files
 256     /// Whether to generate a table of contents on the output file when reading a standalone
 257     /// Markdown file.
 258     pub(crate) markdown_no_toc: bool,
 259     /// Additional CSS files to link in pages generated from standalone Markdown files.
 260     pub(crate) markdown_css: Vec<String>,
 261     /// If present, playground URL to use in the "Run" button added to code samples generated from
 262     /// standalone Markdown files. If not present, `playground_url` is used.
 263     pub(crate) markdown_playground_url: Option<String>,
 264     /// Document items that have lower than `pub` visibility.
 265     pub(crate) document_private: bool,
 266     /// Document items that have `doc(hidden)`.
 267     pub(crate) document_hidden: bool,
 268     /// If `true`, generate a JSON file in the crate folder instead of HTML redirection files.
 269     pub(crate) generate_redirect_map: bool,
 270     /// Show the memory layout of types in the docs.
 271     pub(crate) show_type_layout: bool,
 272     /// Note: this field is duplicated in `Options` because it's useful to have
 273     /// it in both places.
 274     pub(crate) unstable_features: rustc_feature::UnstableFeatures,
 275     pub(crate) emit: Vec<EmitType>,
 276     /// If `true`, HTML source pages will generate links for items to their definition.
 277     pub(crate) generate_link_to_definition: bool,
 278     /// Set of function-call locations to include as examples
 279     pub(crate) call_locations: AllCallLocations,
 280     /// If `true`, Context::init will not emit shared files.
 281     pub(crate) no_emit_shared: bool,
 282 }
 283
 284 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 285 pub(crate) enum ModuleSorting {
 286     DeclarationOrder,
 287     Alphabetical,
 288 }
 289
 290 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 291 pub(crate) enum EmitType {
 292     Unversioned,
 293     Toolchain,
 294     InvocationSpecific,
 295 }
 296
 297 impl FromStr for EmitType {
 298     type Err = ();
 299
 300     fn from_str(s: &str) -> Result<Self, Self::Err> {
 301         use EmitType::*;
 302         match s {
 303             "unversioned-shared-resources" => Ok(Unversioned),
 304             "toolchain-shared-resources" => Ok(Toolchain),
 305             "invocation-specific" => Ok(InvocationSpecific),
 306             _ => Err(()),
 307         }
 308     }
 309 }
 310
 311 impl RenderOptions {
 312     pub(crate) fn should_emit_crate(&self) -> bool {
 313         self.emit.is_empty() || self.emit.contains(&EmitType::InvocationSpecific)
 314     }
 315 }
 316
 317 impl Options {
 318     /// Parses the given command-line for options. If an error message or other early-return has
 319     /// been printed, returns `Err` with the exit code.
 320     pub(crate) fn from_matches(
 321         matches: &getopts::Matches,
 322         args: Vec<String>,
 323     ) -> Result<(Options, RenderOptions), i32> {
 324         let args = &args[1..];
 325         // Check for unstable options.
 326         nightly_options::check_nightly_options(matches, &opts());
 327
 328         if args.is_empty() || matches.opt_present("h") || matches.opt_present("help") {
 329             crate::usage("rustdoc");
 330             return Err(0);
 331         } else if matches.opt_present("version") {
 332             rustc_driver::version("rustdoc", matches);
 333             return Err(0);
 334         }
 335
 336         let z_flags = matches.opt_strs("Z");
 337         if z_flags.iter().any(|x| *x == "help") {
 338             print_flag_list("-Z", config::Z_OPTIONS);
 339             return Err(0);
 340         }
 341         let c_flags = matches.opt_strs("C");
 342         if c_flags.iter().any(|x| *x == "help") {
 343             print_flag_list("-C", config::CG_OPTIONS);
 344             return Err(0);
 345         }
 346
 347         let color = config::parse_color(matches);
 348         let config::JsonConfig { json_rendered, json_unused_externs, .. } =
 349             config::parse_json(matches);
 350         let error_format = config::parse_error_format(matches, color, json_rendered);
 351         let diagnostic_width = matches.opt_get("diagnostic-width").unwrap_or_default();
 352
 353         let codegen_options = CodegenOptions::build(matches, error_format);
 354         let unstable_opts = UnstableOptions::build(matches, error_format);
 355
 356         let diag = new_handler(error_format, None, diagnostic_width, &unstable_opts);
 357
 358         // check for deprecated options
 359         check_deprecated_options(matches, &diag);
 360
 361         if matches.opt_strs("passes") == ["list"] {
 362             println!("Available passes for running rustdoc:");
 363             for pass in passes::PASSES {
 364                 println!("{:>20} - {}", pass.name, pass.description);
 365             }
 366             println!("\nDefault passes for rustdoc:");
 367             for p in passes::DEFAULT_PASSES {
 368                 print!("{:>20}", p.pass.name);
 369                 println_condition(p.condition);
 370             }
 371
 372             if nightly_options::match_is_nightly_build(matches) {
 373                 println!("\nPasses run with `--show-coverage`:");
 374                 for p in passes::COVERAGE_PASSES {
 375                     print!("{:>20}", p.pass.name);
 376                     println_condition(p.condition);
 377                 }
 378             }
 379
 380             fn println_condition(condition: Condition) {
 381                 use Condition::*;
 382                 match condition {
 383                     Always => println!(),
 384                     WhenDocumentPrivate => println!("  (when --document-private-items)"),
 385                     WhenNotDocumentPrivate => println!("  (when not --document-private-items)"),
 386                     WhenNotDocumentHidden => println!("  (when not --document-hidden-items)"),
 387                 }
 388             }
 389
 390             return Err(0);
 391         }
 392
 393         let mut emit = Vec::new();
 394         for list in matches.opt_strs("emit") {
 395             for kind in list.split(',') {
 396                 match kind.parse() {
 397                     Ok(kind) => emit.push(kind),
 398                     Err(()) => {
 399                         diag.err(&format!("unrecognized emission type: {}", kind));
 400                         return Err(1);
 401                     }
 402                 }
 403             }
 404         }
 405
 406         // check for `--output-format=json`
 407         if !matches!(matches.opt_str("output-format").as_deref(), None | Some("html"))
 408             && !matches.opt_present("show-coverage")
 409             && !nightly_options::is_unstable_enabled(matches)
 410         {
 411             rustc_session::early_error(
 412                 error_format,
 413                 "the -Z unstable-options flag must be passed to enable --output-format for documentation generation (see https://github.com/rust-lang/rust/issues/76578)",
 414             );
 415         }
 416
 417         let to_check = matches.opt_strs("check-theme");
 418         if !to_check.is_empty() {
 419             let paths = match theme::load_css_paths(static_files::themes::LIGHT) {
 420                 Ok(p) => p,
 421                 Err(e) => {
 422                     diag.struct_err(&e.to_string()).emit();
 423                     return Err(1);
 424                 }
 425             };
 426             let mut errors = 0;
 427
 428             println!("rustdoc: [check-theme] Starting tests! (Ignoring all other arguments)");
 429             for theme_file in to_check.iter() {
 430                 print!(" - Checking \"{}\"...", theme_file);
 431                 let (success, differences) = theme::test_theme_against(theme_file, &paths, &diag);
 432                 if !differences.is_empty() || !success {
 433                     println!(" FAILED");
 434                     errors += 1;
 435                     if !differences.is_empty() {
 436                         println!("{}", differences.join("\n"));
 437                     }
 438                 } else {
 439                     println!(" OK");
 440                 }
 441             }
 442             if errors != 0 {
 443                 return Err(1);
 444             }
 445             return Err(0);
 446         }
 447
 448         let (lint_opts, describe_lints, lint_cap) = get_cmd_lint_options(matches, error_format);
 449
 450         let input = PathBuf::from(if describe_lints {
 451             "" // dummy, this won't be used
 452         } else if matches.free.is_empty() {
 453             diag.struct_err("missing file operand").emit();
 454             return Err(1);
 455         } else if matches.free.len() > 1 {
 456             diag.struct_err("too many file operands").emit();
 457             return Err(1);
 458         } else {
 459             &matches.free[0]
 460         });
 461
 462         let libs = matches
 463             .opt_strs("L")
 464             .iter()
 465             .map(|s| SearchPath::from_cli_opt(s, error_format))
 466             .collect();
 467         let externs = parse_externs(matches, &unstable_opts, error_format);
 468         let extern_html_root_urls = match parse_extern_html_roots(matches) {
 469             Ok(ex) => ex,
 470             Err(err) => {
 471                 diag.struct_err(err).emit();
 472                 return Err(1);
 473             }
 474         };
 475
 476         let default_settings: Vec<Vec<(String, String)>> = vec![
 477             matches
 478                 .opt_str("default-theme")
 479                 .iter()
 480                 .flat_map(|theme| {
 481                     vec![
 482                         ("use-system-theme".to_string(), "false".to_string()),
 483                         ("theme".to_string(), theme.to_string()),
 484                     ]
 485                 })
 486                 .collect(),
 487             matches
 488                 .opt_strs("default-setting")
 489                 .iter()
 490                 .map(|s| match s.split_once('=') {
 491                     None => (s.clone(), "true".to_string()),
 492                     Some((k, v)) => (k.to_string(), v.to_string()),
 493                 })
 494                 .collect(),
 495         ];
 496         let default_settings = default_settings
 497             .into_iter()
 498             .flatten()
 499             .map(
 500                 // The keys here become part of `data-` attribute names in the generated HTML.  The
 501                 // browser does a strange mapping when converting them into attributes on the
 502                 // `dataset` property on the DOM HTML Node:
 503                 //   https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset
 504                 //
 505                 // The original key values we have are the same as the DOM storage API keys and the
 506                 // command line options, so contain `-`.  Our Javascript needs to be able to look
 507                 // these values up both in `dataset` and in the storage API, so it needs to be able
 508                 // to convert the names back and forth.  Despite doing this kebab-case to
 509                 // StudlyCaps transformation automatically, the JS DOM API does not provide a
 510                 // mechanism for doing the just transformation on a string.  So we want to avoid
 511                 // the StudlyCaps representation in the `dataset` property.
 512                 //
 513                 // We solve this by replacing all the `-`s with `_`s.  We do that here, when we
 514                 // generate the `data-` attributes, and in the JS, when we look them up.  (See
 515                 // `getSettingValue` in `storage.js.`) Converting `-` to `_` is simple in JS.
 516                 //
 517                 // The values will be HTML-escaped by the default Tera escaping.
 518                 |(k, v)| (k.replace('-', "_"), v),
 519             )
 520             .collect();
 521
 522         let test_args = matches.opt_strs("test-args");
 523         let test_args: Vec<String> =
 524             test_args.iter().flat_map(|s| s.split_whitespace()).map(|s| s.to_string()).collect();
 525
 526         let should_test = matches.opt_present("test");
 527         let no_run = matches.opt_present("no-run");
 528
 529         if !should_test && no_run {
 530             diag.err("the `--test` flag must be passed to enable `--no-run`");
 531             return Err(1);
 532         }
 533
 534         let out_dir = matches.opt_str("out-dir").map(|s| PathBuf::from(&s));
 535         let output = matches.opt_str("output").map(|s| PathBuf::from(&s));
 536         let output = match (out_dir, output) {
 537             (Some(_), Some(_)) => {
 538                 diag.struct_err("cannot use both 'out-dir' and 'output' at once").emit();
 539                 return Err(1);
 540             }
 541             (Some(out_dir), None) => out_dir,
 542             (None, Some(output)) => output,
 543             (None, None) => PathBuf::from("doc"),
 544         };
 545
 546         let cfgs = matches.opt_strs("cfg");
 547         let check_cfgs = matches.opt_strs("check-cfg");
 548
 549         let extension_css = matches.opt_str("e").map(|s| PathBuf::from(&s));
 550
 551         if let Some(ref p) = extension_css {
 552             if !p.is_file() {
 553                 diag.struct_err("option --extend-css argument must be a file").emit();
 554                 return Err(1);
 555             }
 556         }
 557
 558         let mut themes = Vec::new();
 559         if matches.opt_present("theme") {
 560             let paths = match theme::load_css_paths(static_files::themes::LIGHT) {
 561                 Ok(p) => p,
 562                 Err(e) => {
 563                     diag.struct_err(&e.to_string()).emit();
 564                     return Err(1);
 565                 }
 566             };
 567
 568             for (theme_file, theme_s) in
 569                 matches.opt_strs("theme").iter().map(|s| (PathBuf::from(&s), s.to_owned()))
 570             {
 571                 if !theme_file.is_file() {
 572                     diag.struct_err(&format!("invalid argument: \"{}\"", theme_s))
 573                         .help("arguments to --theme must be files")
 574                         .emit();
 575                     return Err(1);
 576                 }
 577                 if theme_file.extension() != Some(OsStr::new("css")) {
 578                     diag.struct_err(&format!("invalid argument: \"{}\"", theme_s))
 579                         .help("arguments to --theme must have a .css extension")
 580                         .emit();
 581                     return Err(1);
 582                 }
 583                 let (success, ret) = theme::test_theme_against(&theme_file, &paths, &diag);
 584                 if !success {
 585                     diag.struct_err(&format!("error loading theme file: \"{}\"", theme_s)).emit();
 586                     return Err(1);
 587                 } else if !ret.is_empty() {
 588                     diag.struct_warn(&format!(
 589                         "theme file \"{}\" is missing CSS rules from the default theme",
 590                         theme_s
 591                     ))
 592                     .warn("the theme may appear incorrect when loaded")
 593                     .help(&format!(
 594                         "to see what rules are missing, call `rustdoc --check-theme \"{}\"`",
 595                         theme_s
 596                     ))
 597                     .emit();
 598                 }
 599                 themes.push(StylePath { path: theme_file });
 600             }
 601         }
 602
 603         let edition = config::parse_crate_edition(matches);
 604
 605         let mut id_map = html::markdown::IdMap::new();
 606         let Some(external_html) = ExternalHtml::load(
 607             &matches.opt_strs("html-in-header"),
 608             &matches.opt_strs("html-before-content"),
 609             &matches.opt_strs("html-after-content"),
 610             &matches.opt_strs("markdown-before-content"),
 611             &matches.opt_strs("markdown-after-content"),
 612             nightly_options::match_is_nightly_build(matches),
 613             &diag,
 614             &mut id_map,
 615             edition,
 616             &None,
 617         ) else {
 618             return Err(3);
 619         };
 620
 621         match matches.opt_str("r").as_deref() {
 622             Some("rust") | None => {}
 623             Some(s) => {
 624                 diag.struct_err(&format!("unknown input format: {}", s)).emit();
 625                 return Err(1);
 626             }
 627         }
 628
 629         let index_page = matches.opt_str("index-page").map(|s| PathBuf::from(&s));
 630         if let Some(ref index_page) = index_page {
 631             if !index_page.is_file() {
 632                 diag.struct_err("option `--index-page` argument must be a file").emit();
 633                 return Err(1);
 634             }
 635         }
 636
 637         let target = parse_target_triple(matches, error_format);
 638
 639         let show_coverage = matches.opt_present("show-coverage");
 640
 641         let crate_types = match parse_crate_types_from_list(matches.opt_strs("crate-type")) {
 642             Ok(types) => types,
 643             Err(e) => {
 644                 diag.struct_err(&format!("unknown crate type: {}", e)).emit();
 645                 return Err(1);
 646             }
 647         };
 648
 649         let output_format = match matches.opt_str("output-format") {
 650             Some(s) => match OutputFormat::try_from(s.as_str()) {
 651                 Ok(out_fmt) => {
 652                     if !out_fmt.is_json() && show_coverage {
 653                         diag.struct_err(
 654                             "html output format isn't supported for the --show-coverage option",
 655                         )
 656                         .emit();
 657                         return Err(1);
 658                     }
 659                     out_fmt
 660                 }
 661                 Err(e) => {
 662                     diag.struct_err(&e).emit();
 663                     return Err(1);
 664                 }
 665             },
 666             None => OutputFormat::default(),
 667         };
 668         let crate_name = matches.opt_str("crate-name");
 669         let proc_macro_crate = crate_types.contains(&CrateType::ProcMacro);
 670         let playground_url = matches.opt_str("playground-url");
 671         let maybe_sysroot = matches.opt_str("sysroot").map(PathBuf::from);
 672         let module_sorting = if matches.opt_present("sort-modules-by-appearance") {
 673             ModuleSorting::DeclarationOrder
 674         } else {
 675             ModuleSorting::Alphabetical
 676         };
 677         let resource_suffix = matches.opt_str("resource-suffix").unwrap_or_default();
 678         let enable_minification = !matches.opt_present("disable-minification");
 679         let markdown_no_toc = matches.opt_present("markdown-no-toc");
 680         let markdown_css = matches.opt_strs("markdown-css");
 681         let markdown_playground_url = matches.opt_str("markdown-playground-url");
 682         let crate_version = matches.opt_str("crate-version");
 683         let enable_index_page = matches.opt_present("enable-index-page") || index_page.is_some();
 684         let static_root_path = matches.opt_str("static-root-path");
 685         let test_run_directory = matches.opt_str("test-run-directory").map(PathBuf::from);
 686         let persist_doctests = matches.opt_str("persist-doctests").map(PathBuf::from);
 687         let test_builder = matches.opt_str("test-builder").map(PathBuf::from);
 688         let codegen_options_strs = matches.opt_strs("C");
 689         let unstable_opts_strs = matches.opt_strs("Z");
 690         let lib_strs = matches.opt_strs("L");
 691         let extern_strs = matches.opt_strs("extern");
 692         let runtool = matches.opt_str("runtool");
 693         let runtool_args = matches.opt_strs("runtool-arg");
 694         let enable_per_target_ignores = matches.opt_present("enable-per-target-ignores");
 695         let document_private = matches.opt_present("document-private-items");
 696         let document_hidden = matches.opt_present("document-hidden-items");
 697         let run_check = matches.opt_present("check");
 698         let generate_redirect_map = matches.opt_present("generate-redirect-map");
 699         let show_type_layout = matches.opt_present("show-type-layout");
 700         let nocapture = matches.opt_present("nocapture");
 701         let generate_link_to_definition = matches.opt_present("generate-link-to-definition");
 702         let extern_html_root_takes_precedence =
 703             matches.opt_present("extern-html-root-takes-precedence");
 704
 705         if generate_link_to_definition && (show_coverage || output_format != OutputFormat::Html) {
 706             diag.struct_err(
 707                 "--generate-link-to-definition option can only be used with HTML output format",
 708             )
 709             .emit();
 710             return Err(1);
 711         }
 712
 713         let scrape_examples_options = ScrapeExamplesOptions::new(matches, &diag)?;
 714         let with_examples = matches.opt_strs("with-examples");
 715         let call_locations = crate::scrape_examples::load_call_locations(with_examples, &diag)?;
 716
 717         let unstable_features =
 718             rustc_feature::UnstableFeatures::from_environment(crate_name.as_deref());
 719         let options = Options {
 720             input,
 721             proc_macro_crate,
 722             error_format,
 723             diagnostic_width,
 724             libs,
 725             lib_strs,
 726             externs,
 727             extern_strs,
 728             cfgs,
 729             check_cfgs,
 730             codegen_options,
 731             codegen_options_strs,
 732             unstable_opts,
 733             unstable_opts_strs,
 734             target,
 735             edition,
 736             maybe_sysroot,
 737             lint_opts,
 738             describe_lints,
 739             lint_cap,
 740             should_test,
 741             test_args,
 742             show_coverage,
 743             crate_version,
 744             test_run_directory,
 745             persist_doctests,
 746             runtool,
 747             runtool_args,
 748             enable_per_target_ignores,
 749             test_builder,
 750             run_check,
 751             no_run,
 752             nocapture,
 753             crate_name,
 754             output_format,
 755             json_unused_externs,
 756             scrape_examples_options,
 757             unstable_features,
 758         };
 759         let render_options = RenderOptions {
 760             output,
 761             external_html,
 762             id_map,
 763             playground_url,
 764             module_sorting,
 765             themes,
 766             extension_css,
 767             extern_html_root_urls,
 768             extern_html_root_takes_precedence,
 769             default_settings,
 770             resource_suffix,
 771             enable_minification,
 772             enable_index_page,
 773             index_page,
 774             static_root_path,
 775             markdown_no_toc,
 776             markdown_css,
 777             markdown_playground_url,
 778             document_private,
 779             document_hidden,
 780             generate_redirect_map,
 781             show_type_layout,
 782             unstable_features,
 783             emit,
 784             generate_link_to_definition,
 785             call_locations,
 786             no_emit_shared: false,
 787         };
 788         Ok((options, render_options))
 789     }
 790
 791     /// Returns `true` if the file given as `self.input` is a Markdown file.
 792     pub(crate) fn markdown_input(&self) -> bool {
 793         self.input.extension().map_or(false, |e| e == "md" || e == "markdown")
 794     }
 795 }
 796
 797 /// Prints deprecation warnings for deprecated options
 798 fn check_deprecated_options(matches: &getopts::Matches, diag: &rustc_errors::Handler) {
 799     let deprecated_flags = [];
 800
 801     for &flag in deprecated_flags.iter() {
 802         if matches.opt_present(flag) {
 803             diag.struct_warn(&format!("the `{}` flag is deprecated", flag))
 804                 .note(
 805                     "see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
 806                     for more information",
 807                 )
 808                 .emit();
 809         }
 810     }
 811
 812     let removed_flags = ["plugins", "plugin-path", "no-defaults", "passes", "input-format"];
 813
 814     for &flag in removed_flags.iter() {
 815         if matches.opt_present(flag) {
 816             let mut err = diag.struct_warn(&format!("the `{}` flag no longer functions", flag));
 817             err.note(
 818                 "see issue #44136 <https://github.com/rust-lang/rust/issues/44136> \
 819                 for more information",
 820             );
 821
 822             if flag == "no-defaults" || flag == "passes" {
 823                 err.help("you may want to use --document-private-items");
 824             } else if flag == "plugins" || flag == "plugin-path" {
 825                 err.warn("see CVE-2018-1000622");
 826             }
 827
 828             err.emit();
 829         }
 830     }
 831 }
 832
 833 /// Extracts `--extern-html-root-url` arguments from `matches` and returns a map of crate names to
 834 /// the given URLs. If an `--extern-html-root-url` argument was ill-formed, returns an error
 835 /// describing the issue.
 836 fn parse_extern_html_roots(
 837     matches: &getopts::Matches,
 838 ) -> Result<BTreeMap<String, String>, &'static str> {
 839     let mut externs = BTreeMap::new();
 840     for arg in &matches.opt_strs("extern-html-root-url") {
 841         let (name, url) =
 842             arg.split_once('=').ok_or("--extern-html-root-url must be of the form name=url")?;
 843         externs.insert(name.to_string(), url.to_string());
 844     }
 845     Ok(externs)
 846 }