Auto merge of #124123 - flip1995:clippy-subtree-update, r=Manishearth

Clippy subtree update

r? `@Manishearth`

src/tools/clippy/.github/workflows/remark.yml

@@ -24,7 +24,7 @@ jobs:
         node-version: '18.x'
 
     - name: Install remark
-      run: npm install remark-cli remark-lint remark-lint-maximum-line-length remark-preset-lint-recommended remark-gfm
+      run: npm install remark-cli remark-lint remark-lint-maximum-line-length@^3.1.3 remark-preset-lint-recommended remark-gfm
 
     - name: Install mdbook
       run: |

src/tools/clippy/CHANGELOG.md

@@ -5894,6 +5894,7 @@ Released 2018-09-13
 [`allowed-dotfiles`]: https://doc.rust-lang.org/clippy/lint_configuration.html#allowed-dotfiles
 [`allowed-duplicate-crates`]: https://doc.rust-lang.org/clippy/lint_configuration.html#allowed-duplicate-crates
 [`allowed-idents-below-min-chars`]: https://doc.rust-lang.org/clippy/lint_configuration.html#allowed-idents-below-min-chars
+[`allowed-prefixes`]: https://doc.rust-lang.org/clippy/lint_configuration.html#allowed-prefixes
 [`allowed-scripts`]: https://doc.rust-lang.org/clippy/lint_configuration.html#allowed-scripts
 [`allowed-wildcard-imports`]: https://doc.rust-lang.org/clippy/lint_configuration.html#allowed-wildcard-imports
 [`arithmetic-side-effects-allowed`]: https://doc.rust-lang.org/clippy/lint_configuration.html#arithmetic-side-effects-allowed

src/tools/clippy/book/src/README.md

@@ -18,17 +18,27 @@ category.
 | `clippy::all`         | all lints that are on by default (correctness, suspicious, style, complexity, perf) | **warn/deny** |
 | `clippy::correctness` | code that is outright wrong or useless                                              | **deny**      |
 | `clippy::suspicious`  | code that is most likely wrong or useless                                           | **warn**      |
+| `clippy::style`       | code that should be written in a more idiomatic way                                 | **warn**      |
 | `clippy::complexity`  | code that does something simple but in a complex way                                | **warn**      |
 | `clippy::perf`        | code that can be written to run faster                                              | **warn**      |
-| `clippy::style`       | code that should be written in a more idiomatic way                                 | **warn**      |
-| `clippy::pedantic`    | lints which are rather strict or might have false positives                         | allow         |
+| `clippy::pedantic`    | lints which are rather strict or have occasional false positives                    | allow         |
+| `clippy::restriction` | lints which prevent the use of language and library features[^restrict]             | allow         |
 | `clippy::nursery`     | new lints that are still under development                                          | allow         |
-| `clippy::cargo`       | lints for the cargo manifest                                                        | allow         |                                   | allow         |
+| `clippy::cargo`       | lints for the cargo manifest                                                        | allow         |
+
+More to come, please [file an issue](https://github.com/rust-lang/rust-clippy/issues) if you have ideas!
+
+The `restriction` category should, *emphatically*, not be enabled as a whole. The contained
+lints may lint against perfectly reasonable code, may not have an alternative suggestion,
+and may contradict any other lints (including other categories). Lints should be considered
+on a case-by-case basis before enabling.
 
-More to come, please [file an
-issue](https://github.com/rust-lang/rust-clippy/issues) if you have ideas!
+[^restrict]: Some use cases for `restriction` lints include:
+    - Strict coding styles (e.g. [`clippy::else_if_without_else`]).
+    - Additional restrictions on CI (e.g. [`clippy::todo`]).
+    - Preventing panicking in certain functions (e.g. [`clippy::unwrap_used`]).
+    - Running a lint only on a subset of code (e.g. `#[forbid(clippy::float_arithmetic)]` on a module).
 
-The [lint list](https://rust-lang.github.io/rust-clippy/master/index.html) also
-contains "restriction lints", which are for things which are usually not
-considered "bad", but may be useful to turn on in specific cases. These should
-be used very selectively, if at all.
+[`clippy::else_if_without_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#else_if_without_else
+[`clippy::todo`]: https://rust-lang.github.io/rust-clippy/master/index.html#todo
+[`clippy::unwrap_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#unwrap_used

src/tools/clippy/book/src/development/adding_lints.md

@@ -18,7 +18,6 @@ because that's clearly a non-descriptive name.
     - [Cargo lints](#cargo-lints)
   - [Rustfix tests](#rustfix-tests)
   - [Testing manually](#testing-manually)
-  - [Running directly](#running-directly)
   - [Lint declaration](#lint-declaration)
   - [Lint registration](#lint-registration)
   - [Lint passes](#lint-passes)
@@ -176,23 +175,26 @@ the tests.
 
 Manually testing against an example file can be useful if you have added some
 `println!`s and the test suite output becomes unreadable. To try Clippy with
-your local modifications, run
+your local modifications, run the following from the Clippy directory:
 
-```
+```bash
 cargo dev lint input.rs
 ```
 
-from the working copy root. With tests in place, let's have a look at
-implementing our lint now.
+To run Clippy on an existing project rather than a single file you can use
+
+```bash
+cargo dev lint /path/to/project
+```
+
+Or set up a rustup toolchain that points to the local Clippy binaries
 
-## Running directly
+```bash
+cargo dev setup toolchain
 
-While it's easier to just use `cargo dev lint`, it might be desirable to get
-`target/release/cargo-clippy` and `target/release/clippy-driver` to work as well in some cases.
-By default, they don't work because clippy dynamically links rustc. To help them find rustc,
-add the path printed by`rustc --print target-libdir` (ran inside this workspace so that the rustc version matches)
-to your library search path.
-On linux, this can be done by setting the `LD_LIBRARY_PATH` environment variable to that path.
+# Then in `/path/to/project` you can run
+cargo +clippy clippy
+```
 
 ## Lint declaration
 

src/tools/clippy/book/src/lint_configuration.md

@@ -164,6 +164,32 @@ configuration of Clippy. By default, any configuration will replace the default
 * [`min_ident_chars`](https://rust-lang.github.io/rust-clippy/master/index.html#min_ident_chars)
 
 
+## `allowed-prefixes`
+List of prefixes to allow when determining whether an item's name ends with the module's name.
+If the rest of an item's name is an allowed prefix (e.g. item `ToFoo` or `to_foo` in module `foo`),
+then don't emit a warning.
+
+#### Example
+
+```toml
+allowed-prefixes = [ "to", "from" ]
+```
+
+#### Noteworthy
+
+- By default, the following prefixes are allowed: `to`, `as`, `into`, `from`, `try_into` and `try_from`
+- PascalCase variant is included automatically for each snake_case variant (e.g. if `try_into` is included,
+  `TryInto` will also be included)
+- Use `".."` as part of the list to indicate that the configured values should be appended to the
+default configuration of Clippy. By default, any configuration will replace the default value
+
+**Default Value:** `["to", "as", "into", "from", "try_into", "try_from"]`
+
+---
+**Affected lints:**
+* [`module_name_repetitions`](https://rust-lang.github.io/rust-clippy/master/index.html#module_name_repetitions)
+
+
 ## `allowed-scripts`
 The list of unicode scripts allowed to be used in the scope.
 

src/tools/clippy/clippy_config/src/conf.rs

@@ -39,6 +39,7 @@ const DEFAULT_DOC_VALID_IDENTS: &[&str] = &[
 ];
 const DEFAULT_DISALLOWED_NAMES: &[&str] = &["foo", "baz", "quux"];
 const DEFAULT_ALLOWED_IDENTS_BELOW_MIN_CHARS: &[&str] = &["i", "j", "x", "y", "z", "w", "n"];
+const DEFAULT_ALLOWED_PREFIXES: &[&str] = &["to", "as", "into", "from", "try_into", "try_from"];
 
 /// Conf with parse errors
 #[derive(Default)]
@@ -589,6 +590,26 @@ define_Conf! {
     /// 2. Paths with any segment that containing the word 'prelude'
     /// are already allowed by default.
     (allowed_wildcard_imports: FxHashSet<String> = FxHashSet::default()),
+    /// Lint: MODULE_NAME_REPETITIONS.
+    ///
+    /// List of prefixes to allow when determining whether an item's name ends with the module's name.
+    /// If the rest of an item's name is an allowed prefix (e.g. item `ToFoo` or `to_foo` in module `foo`),
+    /// then don't emit a warning.
+    ///
+    /// #### Example
+    ///
+    /// ```toml
+    /// allowed-prefixes = [ "to", "from" ]
+    /// ```
+    ///
+    /// #### Noteworthy
+    ///
+    /// - By default, the following prefixes are allowed: `to`, `as`, `into`, `from`, `try_into` and `try_from`
+    /// - PascalCase variant is included automatically for each snake_case variant (e.g. if `try_into` is included,
+    ///   `TryInto` will also be included)
+    /// - Use `".."` as part of the list to indicate that the configured values should be appended to the
+    /// default configuration of Clippy. By default, any configuration will replace the default value
+    (allowed_prefixes: Vec<String> = DEFAULT_ALLOWED_PREFIXES.iter().map(ToString::to_string).collect()),
 }
 
 /// Search for the configuration file.
@@ -649,6 +670,7 @@ fn deserialize(file: &SourceFile) -> TryConf {
         Ok(mut conf) => {
             extend_vec_if_indicator_present(&mut conf.conf.doc_valid_idents, DEFAULT_DOC_VALID_IDENTS);
             extend_vec_if_indicator_present(&mut conf.conf.disallowed_names, DEFAULT_DISALLOWED_NAMES);
+            extend_vec_if_indicator_present(&mut conf.conf.allowed_prefixes, DEFAULT_ALLOWED_PREFIXES);
             // TODO: THIS SHOULD BE TESTED, this comment will be gone soon
             if conf.conf.allowed_idents_below_min_chars.contains("..") {
                 conf.conf

src/tools/clippy/clippy_dev/src/fmt.rs

@@ -35,7 +35,6 @@ struct FmtContext {
 }
 
 // the "main" function of cargo dev fmt
-#[allow(clippy::missing_panics_doc)]
 pub fn run(check: bool, verbose: bool) {
     fn try_run(context: &FmtContext) -> Result<bool, CliError> {
         let mut success = true;

src/tools/clippy/clippy_dev/src/lib.rs

@@ -9,6 +9,7 @@
     unused_lifetimes,
     unused_qualifications
 )]
+#![allow(clippy::missing_panics_doc)]
 
 // The `rustc_driver` crate seems to be required in order to use the `rust_lexer` crate.
 #[allow(unused_extern_crates)]

src/tools/clippy/clippy_dev/src/main.rs

@@ -46,6 +46,13 @@ fn main() {
             }
         },
         Some(("setup", sub_command)) => match sub_command.subcommand() {
+            Some(("git-hook", matches)) => {
+                if matches.get_flag("remove") {
+                    setup::git_hook::remove_hook();
+                } else {
+                    setup::git_hook::install_hook(matches.get_flag("force-override"));
+                }
+            },
             Some(("intellij", matches)) => {
                 if matches.get_flag("remove") {
                     setup::intellij::remove_rustc_src();
@@ -57,12 +64,12 @@ fn main() {
                     );
                 }
             },
-            Some(("git-hook", matches)) => {
-                if matches.get_flag("remove") {
-                    setup::git_hook::remove_hook();
-                } else {
-                    setup::git_hook::install_hook(matches.get_flag("force-override"));
-                }
+            Some(("toolchain", matches)) => {
+                setup::toolchain::create(
+                    matches.get_flag("force"),
+                    matches.get_flag("release"),
+                    matches.get_one::<String>("name").unwrap(),
+                );
             },
             Some(("vscode-tasks", matches)) => {
                 if matches.get_flag("remove") {
@@ -210,6 +217,19 @@ fn get_clap_config() -> ArgMatches {
                 .about("Support for setting up your personal development environment")
                 .arg_required_else_help(true)
                 .subcommands([
+                    Command::new("git-hook")
+                        .about("Add a pre-commit git hook that formats your code to make it look pretty")
+                        .args([
+                            Arg::new("remove")
+                                .long("remove")
+                                .action(ArgAction::SetTrue)
+                                .help("Remove the pre-commit hook added with 'cargo dev setup git-hook'"),
+                            Arg::new("force-override")
+                                .long("force-override")
+                                .short('f')
+                                .action(ArgAction::SetTrue)
+                                .help("Forces the override of an existing git pre-commit hook"),
+                        ]),
                     Command::new("intellij")
                         .about("Alter dependencies so Intellij Rust can find rustc internals")
                         .args([
@@ -225,18 +245,23 @@ fn get_clap_config() -> ArgMatches {
                                 .conflicts_with("remove")
                                 .required(true),
                         ]),
-                    Command::new("git-hook")
-                        .about("Add a pre-commit git hook that formats your code to make it look pretty")
+                    Command::new("toolchain")
+                        .about("Install a rustup toolchain pointing to the local clippy build")
                         .args([
-                            Arg::new("remove")
-                                .long("remove")
-                                .action(ArgAction::SetTrue)
-                                .help("Remove the pre-commit hook added with 'cargo dev setup git-hook'"),
-                            Arg::new("force-override")
-                                .long("force-override")
+                            Arg::new("force")
+                                .long("force")
                                 .short('f')
                                 .action(ArgAction::SetTrue)
-                                .help("Forces the override of an existing git pre-commit hook"),
+                                .help("Override an existing toolchain"),
+                            Arg::new("release")
+                                .long("release")
+                                .short('r')
+                                .action(ArgAction::SetTrue)
+                                .help("Point to --release clippy binaries"),
+                            Arg::new("name")
+                                .long("name")
+                                .default_value("clippy")
+                                .help("The name of the created toolchain"),
                         ]),
                     Command::new("vscode-tasks")
                         .about("Add several tasks to vscode for formatting, validation and testing")

src/tools/clippy/clippy_dev/src/new_lint.rs

@@ -36,7 +36,6 @@ impl<T> Context for io::Result<T> {
 /// # Errors
 ///
 /// This function errors out if the files couldn't be created or written to.
-#[allow(clippy::missing_panics_doc)]
 pub fn create(
     pass: &String,
     lint_name: Option<&String>,

src/tools/clippy/clippy_dev/src/setup/mod.rs

@@ -1,5 +1,6 @@
 pub mod git_hook;
 pub mod intellij;
+pub mod toolchain;
 pub mod vscode;
 
 use std::path::Path;

src/tools/clippy/clippy_dev/src/setup/toolchain.rs

@@ -0,0 +1,75 @@
+use std::env::consts::EXE_SUFFIX;
+use std::env::current_dir;
+use std::ffi::OsStr;
+use std::fs;
+use std::path::{Path, PathBuf};
+use walkdir::WalkDir;
+
+use super::verify_inside_clippy_dir;
+
+pub fn create(force: bool, release: bool, name: &str) {
+    if !verify_inside_clippy_dir() {
+        return;
+    }
+
+    let rustup_home = std::env::var("RUSTUP_HOME").unwrap();
+    let toolchain = std::env::var("RUSTUP_TOOLCHAIN").unwrap();
+
+    let src = PathBuf::from_iter([&rustup_home, "toolchains", &toolchain]);
+    let dest = PathBuf::from_iter([&rustup_home, "toolchains", name]);
+
+    if dest.exists() {
+        if force {
+            fs::remove_dir_all(&dest).unwrap();
+        } else {
+            println!("{} already exists, pass `--force` to override it", dest.display());
+            return;
+        }
+    }
+
+    for entry in WalkDir::new(&src) {
+        let entry = entry.unwrap();
+        let relative = entry.path().strip_prefix(&src).unwrap();
+
+        if relative.starts_with("bin")
+            && matches!(
+                relative.file_stem().and_then(OsStr::to_str),
+                Some("cargo-clippy" | "clippy-driver")
+            )
+        {
+            continue;
+        }
+
+        let target = dest.join(relative);
+        if entry.file_type().is_dir() {
+            fs::create_dir(&target).unwrap();
+        } else {
+            fs::hard_link(entry.path(), target).unwrap();
+        }
+    }
+
+    symlink_bin("cargo-clippy", &dest, release);
+    symlink_bin("clippy-driver", &dest, release);
+
+    println!("Created toolchain {name}, use it in other projects with e.g. `cargo +{name} clippy`");
+    println!("Note: This will need to be re-run whenever the Clippy `rust-toolchain` changes");
+}
+
+fn symlink_bin(bin: &str, dest: &Path, release: bool) {
+    #[cfg(windows)]
+    use std::os::windows::fs::symlink_file as symlink;
+
+    #[cfg(not(windows))]
+    use std::os::unix::fs::symlink;
+
+    let profile = if release { "release" } else { "debug" };
+    let file_name = format!("{bin}{EXE_SUFFIX}");
+
+    let mut src = current_dir().unwrap();
+    src.extend(["target", profile, &file_name]);
+
+    let mut dest = dest.to_path_buf();
+    dest.extend(["bin", &file_name]);
+
+    symlink(src, dest).unwrap();
+}