Auto merge of #11495 - blyxyas:help_message_reformat, r=flip1995

Add colored help to be consistent with Cargo

On rust-lang/cargo#12578, a new colored help message format was introduced. This PR introduces the same styling from that `cargo help` message to our `cargo clippy --help` message.

More information is provided in the original PR, fixes #11482. The perfect reviewing process would be that the reviewer installs this branch and checks for themselves, but here are some screenshots, there are some more screenshots in the original issue.

![image](https://github.com/rust-lang/rust-clippy/assets/73757586/0c4d1b6d-5aa2-4146-a401-9ae88f6dedf5)

(Note that the actual text may change in the actual commit, that screenshot is just to test the colors).
Also note that the `color-print` version **should always** be synced with Cargo's `color-print` version to avoid increasing build times in the rust-lang/rust repo.

changelog:Add colors to the `cargo clippy --help` output 🎉.

Cargo.toml

@@ -25,6 +25,8 @@ clippy_lints = { path = "clippy_lints" }
 rustc_tools_util = "0.3.0"
 tempfile = { version = "3.2", optional = true }
 termize = "0.1"
+color-print = "0.3.4" # Sync version with Cargo
+anstream = "0.5.0"
 
 [dev-dependencies]
 ui_test = "0.20"

src/driver.rs

@@ -26,6 +26,8 @@ use std::ops::Deref;
 use std::path::Path;
 use std::process::exit;
 
+use anstream::println;
+
 /// If a command-line option matches `find_arg`, then apply the predicate `pred` on its value. If
 /// true, then return it. The parameter is assumed to be either `--arg=value` or `--arg value`.
 fn arg_value<'a, T: Deref<Target = str>>(
@@ -162,39 +164,15 @@ impl rustc_driver::Callbacks for ClippyCallbacks {
     }
 }
 
+#[allow(clippy::ignored_unit_patterns)]
 fn display_help() {
-    println!(
-        "\
-Checks a package to catch common mistakes and improve your Rust code.
-
-Usage:
-    cargo clippy [options] [--] [<opts>...]
-
-Common options:
-    -h, --help               Print this message
-        --rustc              Pass all args to rustc
-    -V, --version            Print version info and exit
-
-For the other options see `cargo check --help`.
-
-To allow or deny a lint from the command line you can use `cargo clippy --`
-with:
-
-    -W --warn OPT       Set lint warnings
-    -A --allow OPT      Set lint allowed
-    -D --deny OPT       Set lint denied
-    -F --forbid OPT     Set lint forbidden
-
-You can use tool lints to allow or deny lints from your code, eg.:
-
-    #[allow(clippy::needless_lifetimes)]
-"
-    );
+    println!("{}", help_message());
 }
 
 const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust-clippy/issues/new?template=ice.yml";
 
 #[allow(clippy::too_many_lines)]
+#[allow(clippy::ignored_unit_patterns)]
 pub fn main() {
     let handler = EarlyErrorHandler::new(ErrorOutputType::default());
 
@@ -236,6 +214,7 @@ pub fn main() {
 
         if orig_args.iter().any(|a| a == "--version" || a == "-V") {
             let version_info = rustc_tools_util::get_version_info!();
+
             println!("{version_info}");
             exit(0);
         }
@@ -292,3 +271,25 @@ pub fn main() {
         }
     }))
 }
+
+#[must_use]
+fn help_message() -> &'static str {
+    color_print::cstr!(
+        "Checks a file to catch common mistakes and improve your Rust code.
+Run <cyan>clippy-driver</> with the same arguments you use for <cyan>rustc</>
+
+<green,bold>Usage</>:
+    <cyan,bold>clippy-driver</> <cyan>[OPTIONS] INPUT</>
+
+<green,bold>Common options:</>
+    <cyan,bold>-h</>, <cyan,bold>--help</>               Print this message
+    <cyan,bold>-V</>, <cyan,bold>--version</>            Print version info and exit
+    <cyan,bold>--rustc</>                  Pass all arguments to <cyan>rustc</>
+
+<green,bold>Allowing / Denying lints</>
+You can use tool lints to allow or deny lints from your code, e.g.:
+
+    <yellow,bold>#[allow(clippy::needless_lifetimes)]</>
+"
+    )
+}

src/main.rs

@@ -6,37 +6,14 @@ use std::env;
 use std::path::PathBuf;
 use std::process::{self, Command};
 
-const CARGO_CLIPPY_HELP: &str = "Checks a package to catch common mistakes and improve your Rust code.
-
-Usage:
-    cargo clippy [options] [--] [<opts>...]
-
-Common options:
-    --no-deps                Run Clippy only on the given crate, without linting the dependencies
-    --fix                    Automatically apply lint suggestions. This flag implies `--no-deps` and `--all-targets`
-    -h, --help               Print this message
-    -V, --version            Print version info and exit
-    --explain LINT           Print the documentation for a given lint
-
-For the other options see `cargo check --help`.
-
-To allow or deny a lint from the command line you can use `cargo clippy --`
-with:
-
-    -W --warn OPT       Set lint warnings
-    -A --allow OPT      Set lint allowed
-    -D --deny OPT       Set lint denied
-    -F --forbid OPT     Set lint forbidden
-
-You can use tool lints to allow or deny lints from your code, e.g.:
-
-    #[allow(clippy::needless_lifetimes)]
-";
+use anstream::println;
 
+#[allow(clippy::ignored_unit_patterns)]
 fn show_help() {
-    println!("{CARGO_CLIPPY_HELP}");
+    println!("{}", help_message());
 }
 
+#[allow(clippy::ignored_unit_patterns)]
 fn show_version() {
     let version_info = rustc_tools_util::get_version_info!();
     println!("{version_info}");
@@ -168,6 +145,38 @@ where
     }
 }
 
+#[must_use]
+pub fn help_message() -> &'static str {
+    color_print::cstr!(
+"Checks a package to catch common mistakes and improve your Rust code.
+
+<green,bold>Usage</>:
+    <cyan,bold>cargo clippy</> <cyan>[OPTIONS] [--] [<<ARGS>>...]</>
+
+<green,bold>Common options:</>
+    <cyan,bold>--no-deps</>                Run Clippy only on the given crate, without linting the dependencies
+    <cyan,bold>--fix</>                    Automatically apply lint suggestions. This flag implies <cyan>--no-deps</> and <cyan>--all-targets</>
+    <cyan,bold>-h</>, <cyan,bold>--help</>               Print this message
+    <cyan,bold>-V</>, <cyan,bold>--version</>            Print version info and exit
+    <cyan,bold>--explain [LINT]</>         Print the documentation for a given lint
+
+See all options with <cyan,bold>cargo check --help</>.
+
+<green,bold>Allowing / Denying lints</>
+
+To allow or deny a lint from the command line you can use <cyan,bold>cargo clippy --</> with:
+
+    <cyan,bold>-W</> / <cyan,bold>--warn</> <cyan>[LINT]</>       Set lint warnings
+    <cyan,bold>-A</> / <cyan,bold>--allow</> <cyan>[LINT]</>      Set lint allowed
+    <cyan,bold>-D</> / <cyan,bold>--deny</> <cyan>[LINT]</>       Set lint denied
+    <cyan,bold>-F</> / <cyan,bold>--forbid</> <cyan>[LINT]</>     Set lint forbidden
+
+You can use tool lints to allow or deny lints from your code, e.g.:
+
+    <yellow,bold>#[allow(clippy::needless_lifetimes)]</>
+"
+    )
+}
 #[cfg(test)]
 mod tests {
     use super::ClippyCmd;