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Update readme for new clippy install method

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Jane Lusby 2018-07-16 13:05:02 -07:00
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README.md
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@ -35,44 +35,45 @@ Table of contents:
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.
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 cargo subcommand (`cargo clippy`)
One way to use Clippy is by installing Clippy through rustup as a cargo
subcommand.
#### Step 1: Install rustup
You can install [rustup](http://rustup.rs/) on supported platforms. This will help
us install clippy and its dependencies.
If you already have rustup installed, update to ensure you have the latest
rustup and compiler:
```terminal
rustup update
```
#### Step 2: Install nightly toolchain
As a general rule Clippy will only work with the *latest* Rust nightly for now.
To install Rust nightly, the recommended way is to use [rustup](https://rustup.rs/):
To install Rust nightly with [rustup](https://rustup.rs/):
```terminal
rustup install nightly
```
### As a cargo subcommand (`cargo clippy`)
#### Step 3: Install clippy
One way to use Clippy is by installing Clippy through cargo as a cargo
subcommand.
Once you have rustup and the nightly toolchain installed, run the following command:
```terminal
cargo +nightly install clippy
rustup component add clippy-preview --toolchain=nightly
```
(The `+nightly` is not necessary if your default `rustup` install is nightly)
Now you can run Clippy by invoking `cargo +nightly clippy`.
To update the subcommand together with the latest nightly use the [rust-update](rust-update) script or run:
```terminal
rustup update nightly
cargo +nightly install --force clippy
```
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.
```terminal
SYSROOT=/path/to/rustc/sysroot cargo install clippy
```
### Running Clippy from the command line without installing it
To have cargo compile your crate with Clippy without Clippy installation