Rollup merge of rust-lang#88831 - inashivb:issue-88756, r=GuillaumeGomez,notriddle

Fix `rustdoc` argument error

This is the fix is corresponding to rust-lang#88756 mentored by ```@jyn514```

Author: Dylan-DPC

compiler/rustc_driver/src/lib.rs

@@ -930,7 +930,7 @@ fn describe_codegen_flags() {
     print_flag_list("-C", config::CG_OPTIONS);
 }
 
-fn print_flag_list<T>(
+pub fn print_flag_list<T>(
     cmdline_opt: &str,
     flag_list: &[(&'static str, T, &'static str, &'static str)],
 ) {

src/librustdoc/config.rs

@@ -6,6 +6,7 @@ use std::path::PathBuf;
 use std::str::FromStr;
 
 use rustc_data_structures::fx::FxHashMap;
+use rustc_driver::print_flag_list;
 use rustc_session::config::{
     self, parse_crate_types_from_list, parse_externs, parse_target_triple, CrateType,
 };
@@ -308,11 +309,12 @@ impl RenderOptions {
 impl Options {
     /// Parses the given command-line for options. If an error message or other early-return has
     /// been printed, returns `Err` with the exit code.
-    crate fn from_matches(matches: &getopts::Matches) -> Result<Options, i32> {
+    crate fn from_matches(matches: &getopts::Matches, args: Vec<String>) -> Result<Options, i32> {
+        let args = &args[1..];
         // Check for unstable options.
         nightly_options::check_nightly_options(matches, &opts());
 
-        if matches.opt_present("h") || matches.opt_present("help") {
+        if args.is_empty() || matches.opt_present("h") || matches.opt_present("help") {
             crate::usage("rustdoc");
             return Err(0);
         } else if matches.opt_present("version") {
@@ -333,6 +335,21 @@ impl Options {
         // check for deprecated options
         check_deprecated_options(matches, &diag);
 
+        let z_flags = matches.opt_strs("Z");
+        if z_flags.iter().any(|x| *x == "help") {
+            print_flag_list("-Z", config::DB_OPTIONS);
+            return Err(0);
+        }
+        let c_flags = matches.opt_strs("C");
+        if c_flags.iter().any(|x| *x == "help") {
+            print_flag_list("-C", config::CG_OPTIONS);
+            return Err(0);
+        }
+        let w_flags = matches.opt_strs("W");
+        if w_flags.iter().any(|x| *x == "help") {
+            print_flag_list("-W", config::DB_OPTIONS);
+            return Err(0);
+        }
         if matches.opt_strs("passes") == ["list"] {
             println!("Available passes for running rustdoc:");
             for pass in passes::PASSES {
@@ -413,6 +430,7 @@ impl Options {
             }
             return Err(0);
         }
+        let (_lint_opts, _describe_lints, _lint_cap) = get_cmd_lint_options(matches, error_format);
 
         if matches.free.is_empty() {
             diag.struct_err("missing file operand").emit();

src/librustdoc/lib.rs

@@ -690,7 +690,7 @@ fn main_args(at_args: &[String]) -> MainResult {
 
     // Note that we discard any distinction between different non-zero exit
     // codes from `from_matches` here.
-    let options = match config::Options::from_matches(&matches) {
+    let options = match config::Options::from_matches(&matches, args) {
         Ok(opts) => opts,
         Err(code) => {
             return if code == 0 {

src/test/run-make/issue-88756-default-output/Makefile

@@ -0,0 +1,4 @@
+-include ../../run-make-fulldeps/tools.mk
+
+all:
+	$(BARE_RUSTDOC) 2>&1 | diff - output-default.stdout

src/test/run-make/issue-88756-default-output/README.md

@@ -0,0 +1 @@
+This is a test to verify that the default behavior of `rustdoc` is printing out help output instead of erroring out (#88756).

src/test/run-make/issue-88756-default-output/output-default.stdout

@@ -0,0 +1,192 @@
+rustdoc [options] <input>
+
+Options:
+    -h, --help          show this help message
+    -V, --version       print rustdoc's version
+    -v, --verbose       use verbose output
+    -w, --output-format [html]
+                        the output type to write
+        --output PATH   Which directory to place the output. This option is
+                        deprecated, use --out-dir instead.
+    -o, --out-dir PATH  which directory to place the output
+        --crate-name NAME
+                        specify the name of this crate
+        --crate-type [bin|lib|rlib|dylib|cdylib|staticlib|proc-macro]
+                        Comma separated list of types of crates
+                        for the compiler to emit
+    -L, --library-path DIR
+                        directory to add to crate search path
+        --cfg           pass a --cfg to rustc
+        --extern NAME[=PATH]
+                        pass an --extern to rustc
+        --extern-html-root-url NAME=URL
+                        base URL to use for dependencies; for example,
+                        "std=/doc" links std::vec::Vec to
+                        /doc/std/vec/struct.Vec.html
+        --extern-html-root-takes-precedence 
+                        give precedence to `--extern-html-root-url`, not
+                        `html_root_url`
+    -C, --codegen OPT[=VALUE]
+                        pass a codegen option to rustc
+        --document-private-items 
+                        document private items
+        --document-hidden-items 
+                        document items that have doc(hidden)
+        --test          run code examples as tests
+        --test-args ARGS
+                        arguments to pass to the test runner
+        --test-run-directory PATH
+                        The working directory in which to run tests
+        --target TRIPLE target triple to document
+        --markdown-css FILES
+                        CSS files to include via <link> in a rendered Markdown
+                        file
+        --html-in-header FILES
+                        files to include inline in the <head> section of a
+                        rendered Markdown file or generated documentation
+        --html-before-content FILES
+                        files to include inline between <body> and the content
+                        of a rendered Markdown file or generated documentation
+        --html-after-content FILES
+                        files to include inline between the content and
+                        </body> of a rendered Markdown file or generated
+                        documentation
+        --markdown-before-content FILES
+                        files to include inline between <body> and the content
+                        of a rendered Markdown file or generated documentation
+        --markdown-after-content FILES
+                        files to include inline between the content and
+                        </body> of a rendered Markdown file or generated
+                        documentation
+        --markdown-playground-url URL
+                        URL to send code snippets to
+        --markdown-no-toc 
+                        don't include table of contents
+    -e, --extend-css PATH
+                        To add some CSS rules with a given file to generate
+                        doc with your own theme. However, your theme might
+                        break if the rustdoc's generated HTML changes, so be
+                        careful!
+    -Z FLAG             internal and debugging options (only on nightly build)
+        --sysroot PATH  Override the system root
+        --playground-url URL
+                        URL to send code snippets to, may be reset by
+                        --markdown-playground-url or
+                        `#![doc(html_playground_url=...)]`
+        --display-doctest-warnings 
+                        show warnings that originate in doctests
+        --crate-version VERSION
+                        crate version to print into documentation
+        --sort-modules-by-appearance 
+                        sort modules by where they appear in the program,
+                        rather than alphabetically
+        --default-theme THEME
+                        Set the default theme. THEME should be the theme name,
+                        generally lowercase. If an unknown default theme is
+                        specified, the builtin default is used. The set of
+                        themes, and the rustdoc built-in default, are not
+                        stable.
+        --default-setting SETTING[=VALUE]
+                        Default value for a rustdoc setting (used when
+                        "rustdoc-SETTING" is absent from web browser Local
+                        Storage). If VALUE is not supplied, "true" is used.
+                        Supported SETTINGs and VALUEs are not documented and
+                        not stable.
+        --theme FILES   additional themes which will be added to the generated
+                        docs
+        --check-theme FILES
+                        check if given theme is valid
+        --resource-suffix PATH
+                        suffix to add to CSS and JavaScript files, e.g.,
+                        "light.css" will become "light-suffix.css"
+        --edition EDITION
+                        edition to use when compiling rust code (default:
+                        2015)
+        --color auto|always|never
+                        Configure coloring of output:
+                        auto = colorize, if output goes to a tty (default);
+                        always = always colorize output;
+                        never = never colorize output
+        --error-format human|json|short
+                        How errors and other messages are produced
+        --json CONFIG   Configure the structure of JSON diagnostics
+        --disable-minification 
+                        Disable minification applied on JS files
+    -A, --allow LINT    Set lint allowed
+    -W, --warn LINT     Set lint warnings
+        --force-warn LINT
+                        Set lint force-warn
+    -D, --deny LINT     Set lint denied
+    -F, --forbid LINT   Set lint forbidden
+        --cap-lints LEVEL
+                        Set the most restrictive lint level. More restrictive
+                        lints are capped at this level. By default, it is at
+                        `forbid` level.
+        --index-page PATH
+                        Markdown file to be used as index page
+        --enable-index-page 
+                        To enable generation of the index page
+        --static-root-path PATH
+                        Path string to force loading static files from in
+                        output pages. If not set, uses combinations of '../'
+                        to reach the documentation root.
+        --disable-per-crate-search 
+                        disables generating the crate selector on the search
+                        box
+        --persist-doctests PATH
+                        Directory to persist doctest executables into
+        --show-coverage 
+                        calculate percentage of public items with
+                        documentation
+        --enable-per-target-ignores 
+                        parse ignore-foo for ignoring doctests on a per-target
+                        basis
+        --runtool The tool to run tests with when building for a different target than host
+                        
+        --runtool-arg One (of possibly many) arguments to pass to the runtool
+                        
+        --test-builder PATH
+                        The rustc-like binary to use as the test builder
+        --check         Run rustdoc checks
+        --generate-redirect-map 
+                        Generate JSON file at the top level instead of
+                        generating HTML redirection files
+        --emit [unversioned-shared-resources,toolchain-shared-resources,invocation-specific]
+                        Comma separated list of types of output for rustdoc to
+                        emit
+        --no-run        Compile doctests without running them
+        --show-type-layout 
+                        Include the memory layout of types in the docs
+        --nocapture     Don't capture stdout and stderr of tests
+        --generate-link-to-definition 
+                        Make the identifiers in the HTML source code pages
+                        navigable
+        --scrape-examples-output-path collect function call information and output at the given path
+                        
+        --scrape-examples-target-crate collect function call information for functions from the target crate
+                        
+        --scrape-tests  Include test code when scraping examples
+        --with-examples path to function call information (for displaying examples in the documentation)
+                        
+        --plugin-path DIR
+                        removed, see issue #44136
+                        <https://github.com/rust-lang/rust/issues/44136> for
+                        more information
+        --passes PASSES removed, see issue #44136
+                        <https://github.com/rust-lang/rust/issues/44136> for
+                        more information
+        --plugins PLUGINS
+                        removed, see issue #44136
+                        <https://github.com/rust-lang/rust/issues/44136> for
+                        more information
+        --no-defaults   removed, see issue #44136
+                        <https://github.com/rust-lang/rust/issues/44136> for
+                        more information
+    -r, --input-format [rust]
+                        removed, see issue #44136
+                        <https://github.com/rust-lang/rust/issues/44136> for
+                        more information
+
+    @path               Read newline separated options from `path`
+
+More information available at https://doc.rust-lang.org/nightly/rustdoc/what-is-rustdoc.html

src/test/run-make/issue-88756-default-output/x.rs

@@ -0,0 +1 @@
+// nothing to see here

src/test/run-make/issue-88756-opt-help/Makefile

@@ -0,0 +1,4 @@
+-include ../../run-make-fulldeps/tools.mk
+
+all:
+	$(RUSTDOC) -W help 2>&1 | diff - output-default.stdout

src/test/run-make/issue-88756-opt-help/README.md

@@ -0,0 +1 @@
+This is a test to verify that `rustdoc` behaves the same as rustc and prints out help output for its options like -W (#88756).