Add build and test subcommands (binary-emitting Clippy)

README.md

@@ -88,6 +88,13 @@ Now you can run Clippy by invoking the following command:
 cargo clippy
 ```
 
+You can also test or build your project with Clippy lints as add-on with this command:
+
+```terminal
+cargo clippy build
+cargo clippy test
+```
+
 #### Automatically applying Clippy suggestions
 
 Clippy can automatically apply some lint suggestions, just like the compiler. Note that `--fix` implies

book/src/continuous_integration/README.md

@@ -16,3 +16,11 @@ your crate for maximum compatibility. E.g. if your crate is compiled with the
 
 This chapter will give an overview on how to use Clippy on different popular CI
 providers.
+
+## CI Time optimization
+
+You can optimize time in your CI by running `cargo clippy test`, this will test your application at the same time as
+it's linted. If Clippy doesn't report anything (or only has warnings), you will be saving precious CI time, as
+there's no need to rebuild your application.
+
+So, compilation time is halved compared to running `cargo clippy` and THEN `cargo test`.

book/src/usage.md

@@ -16,6 +16,16 @@ just run
 cargo clippy
 ```
 
+## Running build/test at the same time as Clippy
+
+You can also emit binaries and test your project with Clippy enabled! Reducing your compilation times as there's no
+need to recompile.
+
+```bash
+cargo clippy test
+cargo clippy build
+```
+
 ### Lint configuration
 
 The above command will run the default set of lints, which are included in the

src/main.rs

@@ -67,7 +67,19 @@ impl ClippyCmd {
 
         for arg in old_args.by_ref() {
             match arg.as_str() {
+                "build" => {
+                    cargo_subcommand = "build";
+                    continue;
+                },
+                "test" => {
+                    cargo_subcommand = "test";
+                    continue;
+                },
                 "--fix" => {
+                    if cargo_subcommand != "check" {
+                        eprintln!("Running `cargo clippy {cargo_subcommand}` is not available with the --fix flag");
+                        process::exit(1) // Same code as `--explain` encountering an unknown lint
+                    }
                     cargo_subcommand = "fix";
                     continue;
                 },
@@ -154,15 +166,17 @@ pub fn help_message() -> &'static str {
 
 <green,bold>Usage</>:
     <cyan,bold>cargo clippy</> <cyan>[OPTIONS] [--] [<<ARGS>>...]</>
+    <cyan,bold>cargo clippy test</> <cyan>[OPTIONS] [--] [<<ARGS>>...]</> for running `test` with Clippy as add-on
+    <cyan,bold>cargo clippy build</> <cyan>[OPTIONS] [--] [<<ARGS>>...]</> for running `build` with Clippy as add-on
 
 <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>--fix</>                    Automatically apply lint suggestions. This flag implies <cyan>--no-deps</> and <cyan>--all-targets</> (not available on test/build)
     <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</>.
+See all options with <cyan,bold>cargo check --help</> or <cyan,bold>cargo build/test --help</> for the build or test subcommands
 
 <green,bold>Allowing / Denying lints</>
 
@@ -213,9 +227,17 @@ mod tests {
     }
 
     #[test]
-    fn check() {
+    fn cargo_subcommand() {
         let args = "cargo clippy".split_whitespace().map(ToString::to_string);
         let cmd = ClippyCmd::new(args);
         assert_eq!("check", cmd.cargo_subcommand);
+
+        let args = "cargo clippy build".split_whitespace().map(ToString::to_string);
+        let cmd = ClippyCmd::new(args);
+        assert_eq!("build", cmd.cargo_subcommand);
+
+        let args = "cargo clippy test".split_whitespace().map(ToString::to_string);
+        let cmd = ClippyCmd::new(args);
+        assert_eq!("test", cmd.cargo_subcommand);
     }
 }