-# rust-clippy
+We are currently in the process of discussing Clippy 1.0 via the RFC process in https://github.com/rust-lang/rfcs/pull/2476 . The RFC's goal is to clarify policies around lint categorizations and the policy around which lints should be in the compiler and which lints should be in Clippy. Please leave your thoughts on the RFC PR.
+
+# Clippy
[](https://travis-ci.org/rust-lang-nursery/rust-clippy)
-[](https://ci.appveyor.com/project/rust-lang-nursery/rust-clippy)
+[](https://ci.appveyor.com/project/rust-lang-libs/rust-clippy)
[](https://crates.io/crates/clippy)
[](#license)
A collection of lints to catch common mistakes and improve your [Rust](https://github.com/rust-lang/rust) code.
-[There are 268 lints included in this crate!](https://rust-lang-nursery.github.io/rust-clippy/master/index.html)
+[There are 273 lints included in this crate!](https://rust-lang-nursery.github.io/rust-clippy/master/index.html)
-We have a bunch of lint categories to allow you to choose how much clippy is supposed to ~~annoy~~ help you:
+We have a bunch of lint categories to allow you to choose how much Clippy is supposed to ~~annoy~~ help you:
-* `clippy` (everything that has no false positives)
-* `clippy_pedantic` (everything)
-* `clippy_nursery` (new lints that aren't quite ready yet)
-* `clippy_style` (code that should be written in a more idiomatic way)
-* `clippy_complexity` (code that does something simple but in a complex way)
-* `clippy_perf` (code that can be written in a faster way)
-* `clippy_cargo` (checks against the cargo manifest)
-* **`clippy_correctness`** (code that is just outright wrong or very very useless)
+* `clippy::all` (everything that has no false positives)
+* `clippy::pedantic` (everything)
+* `clippy::nursery` (new lints that aren't quite ready yet)
+* `clippy::style` (code that should be written in a more idiomatic way)
+* `clippy::complexity` (code that does something simple but in a complex way)
+* `clippy::perf` (code that can be written in a faster way)
+* `clippy::cargo` (checks against the cargo manifest)
+* **`clippy::correctness`** (code that is just outright wrong or very very useless)
More to come, please [file an issue](https://github.com/rust-lang-nursery/rust-clippy/issues) if you have ideas!
## Usage
Since this is a tool for helping the developer of a library or application
-write better code, it is recommended not to include clippy as a hard dependency.
+write better code, it is recommended not to include Clippy as a hard dependency.
Options include using it as an optional dependency, as a cargo subcommand, or
-as an included feature during build. All of these options are detailed below.
+as an included feature during build. These options are detailed below.
-As a general rule clippy will only work with the *latest* Rust nightly for now.
+### As a cargo subcommand (`cargo clippy`)
-To install Rust nightly, the recommended way is to use [rustup](https://rustup.rs/):
+One way to use Clippy is by installing Clippy through rustup as a cargo
+subcommand.
-```terminal
-rustup install nightly
-```
+#### Step 1: Install rustup
-### As a cargo subcommand (`cargo clippy`)
+You can install [rustup](http://rustup.rs/) on supported platforms. This will help
+us install clippy and its dependencies.
-One way to use clippy is by installing clippy through cargo as a cargo
-subcommand.
+If you already have rustup installed, update to ensure you have the latest
+rustup and compiler:
```terminal
-cargo +nightly install clippy
+rustup update
```
-(The `+nightly` is not necessary if your default `rustup` install is nightly)
+#### Step 2: Install nightly toolchain
-Now you can run clippy by invoking `cargo +nightly clippy`.
+Rustup integration is still new, you will need a relatively new nightly (2018-07-15 or later).
-To update the subcommand together with the latest nightly use the [rust-update](rust-update) script or run:
+To install Rust nightly with [rustup](https://rustup.rs/):
```terminal
-rustup update nightly
-cargo +nightly install --force clippy
+rustup install nightly
```
-In case you are not using rustup, you need to set the environment flag
-`SYSROOT` during installation so clippy knows where to find `librustc` and
-similar crates.
+#### Step 3: Install clippy
+
+Once you have rustup and the nightly toolchain installed, run the following command:
```terminal
-SYSROOT=/path/to/rustc/sysroot cargo install clippy
+rustup component add clippy-preview --toolchain=nightly
```
-### Running clippy from the command line without installing it
+Now you can run Clippy by invoking `cargo +nightly clippy`. If nightly is your
+default toolchain in rustup, `cargo clippy` will work fine.
+
+### Running Clippy from the command line without installing it
-To have cargo compile your crate with clippy without clippy installation
+To have cargo compile your crate with Clippy without Clippy installation
in your code, you can use:
```terminal
```
*[Note](https://github.com/rust-lang-nursery/rust-clippy/wiki#a-word-of-warning):*
-Be sure that clippy was compiled with the same version of rustc that cargo invokes here!
+Be sure that Clippy was compiled with the same version of rustc that cargo invokes here!
## Configuration
You can add options to `allow`/`warn`/`deny`:
-* the whole set of `Warn` lints using the `clippy` lint group (`#![deny(clippy)]`)
+* the whole set of `Warn` lints using the `clippy` lint group (`#![deny(clippy::all)]`)
-* all lints using both the `clippy` and `clippy_pedantic` lint groups (`#![deny(clippy)]`,
- `#![deny(clippy_pedantic)]`). Note that `clippy_pedantic` contains some very aggressive
+* all lints using both the `clippy` and `clippy::pedantic` lint groups (`#![deny(clippy::all)]`,
+ `#![deny(clippy::pedantic)]`). Note that `clippy::pedantic` contains some very aggressive
lints prone to false positives.
-* only some lints (`#![deny(single_match, box_vec)]`, etc)
+* only some lints (`#![deny(clippy::single_match, clippy::box_vec)]`, etc)
* `allow`/`warn`/`deny` can be limited to a single function or module using `#[allow(...)]`, etc
Note: `deny` produces errors instead of warnings.
-For convenience, `cargo clippy` automatically defines a `cargo-clippy`
-feature. This lets you set lint levels and compile with or without clippy
-transparently:
-
-```rust
-#[cfg_attr(feature = "cargo-clippy", allow(needless_lifetimes))]
-```
-
## Updating rustc
-Sometimes, rustc moves forward without clippy catching up. Therefore updating
-rustc may leave clippy a non-functional state until we fix the resulting
+Sometimes, rustc moves forward without Clippy catching up. Therefore updating
+rustc may leave Clippy a non-functional state until we fix the resulting
breakage.
You can use the [rust-update](rust-update) script to update rustc only if
-clippy would also update correctly.
+Clippy would also update correctly.
## License
projects / rust.git / blobdiff