-# rustfmt [](https://travis-ci.org/rust-lang-nursery/rustfmt) [](https://ci.appveyor.com/project/nrc/rustfmt) [](https://crates.io/crates/rustfmt-nightly) [](https://travis-ci.org/davidalber/rustfmt-travis)
+# rustfmt [](https://travis-ci.org/rust-lang/rustfmt) [](https://ci.appveyor.com/project/nrc/rustfmt) [](https://crates.io/crates/rustfmt-nightly) [](https://travis-ci.org/davidalber/rustfmt-travis)
A tool for formatting Rust code according to style guidelines.
[Contributing.md](Contributing.md) and our [Code of
Conduct](CODE_OF_CONDUCT.md).
-We are changing the default style used by rustfmt. There is an ongoing [RFC
-process][fmt rfcs]. The last version using the old style was 0.8.6. From 0.9
-onwards, the RFC style is the default. If you want the old style back, you can
-use [legacy-rustfmt.toml](legacy-rustfmt.toml) as your rustfmt.toml.
-
-The current `master` branch uses libsyntax (part of the compiler). It is
-published as `rustfmt-nightly`. The `syntex` branch uses Syntex instead of
-libsyntax, it is published (for now) as `rustfmt`. Most development happens on
-the `master` branch, however, this only supports nightly toolchains. If you use
-stable or beta Rust toolchains, you must use the Syntex version (which is likely
-to be a bit out of date). Version 0.1 of rustfmt-nightly is forked from version
-0.9 of the syntex branch.
-
You can use rustfmt in Travis CI builds. We provide a minimal Travis CI
configuration (see [here](#checking-style-on-a-ci-server)) and verify its status
using another repository. The status of that repository's build is reported by
the "travis example" badge above.
-
## Quick start
-You can use `rustfmt` on Rust 1.24 and above.
+You can run `rustfmt` with Rust 1.24 and above.
To install:
```
-rustup component add rustfmt-preview
+rustup component add rustfmt
```
to run on a cargo project in the current working directory:
For the latest and greatest `rustfmt` (nightly required):
```
-rustup component add rustfmt-preview --toolchain nightly
+rustup component add rustfmt --toolchain nightly
```
To run:
```
cargo +nightly fmt
```
-To format code that requires edition 2018, create a `rustfmt.toml` [configuration](#configuring-rustfmt) file containing:
-
-```toml
-edition = "Edition2018"
-```
-
## Limitations
Rustfmt tries to work on as much Rust code as possible, sometimes, the code
## Installation
```
-rustup component add rustfmt-preview
+rustup component add rustfmt
```
## Installing from source
To install from source (nightly required), first checkout to the tag or branch you want to install, then issue
+
```
cargo install --path .
```
read data from stdin. Alternatively, you can use `cargo fmt` to format all
binary and library targets of your crate.
-You can run `rustfmt --help` for information about argument.
+You can run `rustfmt --help` for information about available arguments.
When running with `--check`, Rustfmt will exit with `0` if Rustfmt would not
make any formatting changes to the input, and `1` if Rustfmt would make changes.
* [Sublime Text 3](https://packagecontrol.io/packages/RustFmt)
* [Atom](atom.md)
* Visual Studio Code using [vscode-rust](https://github.com/editor-rs/vscode-rust), [vsc-rustfmt](https://github.com/Connorcpu/vsc-rustfmt) or [rls_vscode](https://github.com/jonathandturner/rls_vscode) through RLS.
+* [IntelliJ or CLion](intellij.md)
## Checking style on a CI server
```yaml
language: rust
-rust:
-- nightly
before_script:
-- rustup component add rustfmt-preview
+- rustup component add rustfmt
script:
- cargo fmt --all -- --check
- cargo build
Rustfmt is designed to be very configurable. You can create a TOML file called
`rustfmt.toml` or `.rustfmt.toml`, place it in the project or any other parent
directory and it will apply the options in that file. See `rustfmt
---config-help` for the options which are available, or if you prefer to see
+--help=config` for the options which are available, or if you prefer to see
visual style previews, [Configurations.md](Configurations.md).
By default, Rustfmt uses a style which conforms to the [Rust style guide][style
## Tips
-* For things you do not want rustfmt to mangle, use one of
-
- ```rust
- #[rustfmt::skip] // requires nightly Rust and #![feature(tool_attributes)] in crate root
- #[cfg_attr(rustfmt, rustfmt_skip)] // works in stable
- ```
+* For things you do not want rustfmt to mangle, use `#[rustfmt::skip]`
* When you run rustfmt, place a file named `rustfmt.toml` or `.rustfmt.toml` in
target file directory or its parents to override the default settings of
rustfmt. You can generate a file containing the default configuration with
* If you're having issues compiling Rustfmt (or compile errors when trying to
install), make sure you have the most recent version of Rust installed.
-* If you get an error like `error while loading shared libraries` while starting
- up rustfmt you should try the following:
-
- On Linux:
-
- ```
- export LD_LIBRARY_PATH=$(rustc --print sysroot)/lib:$LD_LIBRARY_PATH
- ```
-
- On MacOS:
-
- ```
- export DYLD_LIBRARY_PATH=$(rustc --print sysroot)/lib:$DYLD_LIBRARY_PATH
- ```
-
- On Windows (Git Bash/Mingw):
-
- ```
- export PATH=$(rustc --print sysroot)/lib/rustlib/x86_64-pc-windows-gnu/lib/:$PATH
- ```
-
- (Substitute `x86_64` by `i686` and `gnu` by `msvc` depending on which version of rustc was used to install rustfmt).
-
* You can change the way rustfmt emits the changes with the --emit flag:
Example:
```
- cargo fmt --emit files
+ cargo fmt -- --emit files
```
Options:
| Flag |Description| Nightly Only |
|:---:|:---:|:---:|
| files | overwrites output to files | No |
- | stdout | writes output to stdout | No |
+ | stdout | writes output to stdout | No |
| coverage | displays how much of the input file was processed | Yes |
| checkstyle | emits in a checkstyle format | Yes |
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