-# rustfmt [](https://travis-ci.org/rust-lang-nursery/rustfmt) [](https://ci.appveyor.com/api/projects/status/github/rust-lang-nursery/rustfmt) [](https://crates.io/crates/rustfmt-nightly)
+# rustfmt [](https://travis-ci.org/rust-lang-nursery/rustfmt) [](https://ci.appveyor.com/project/nrc/rustfmt) [](https://crates.io/crates/rustfmt-nightly)
A tool for formatting Rust code according to style guidelines.
## Quick start
-You must be using the latest nightly compiler toolchain.
+Currently, you can use `rustfmt` on nightly and beta. Rust 1.24 stable will work,
+but we're not quite there yet!
To install:
```
-cargo install rustfmt-nightly
+rustup component add rustfmt-preview --toolchain=nightly
```
+If `nightly` is your default toolchain, you can leave the `--toolchain` off.
+
to run on a cargo project in the current working directory:
```
-cargo fmt
+cargo +nightly fmt
```
-## Installation
-
-```
-cargo install rustfmt-nightly
-```
+If `nightly` is your default toolchain, you can leave off the `+nightly`.
-or if you're using [Rustup](https://www.rustup.rs/)
+## Installation
```
-rustup update
-rustup run nightly cargo install rustfmt-nightly
+rustup component add rustfmt-preview --toolchain=nightly
```
If you don't have a nightly toolchain, you can add it using rustup:
If you choose not to do that you'll have to run rustfmt using `rustup run ...`
or by adding `+nightly` to the cargo invocation.
-Usually cargo-fmt, which enables usage of Cargo subcommand `cargo fmt`, is
-installed alongside rustfmt. To only install rustfmt run
-
-```
-cargo install --no-default-features rustfmt-nightly
-```
## Installing from source
To install from source, first checkout to the tag or branch you want to install, then issue
If `rustfmt` successfully reformatted the code it will exit with `0` exit
status. Exit status `1` signals some unexpected error, like an unknown option or
a failure to read a file. Exit status `2` is returned if there are syntax errors
-in the input files. `rustfmt` can't format syntatically invalid code. Finally,
+in the input files. `rustfmt` can't format syntactically invalid code. Finally,
exit status `3` is returned if there are some issues which can't be resolved
automatically. For example, if you have a very long comment line `rustfmt`
doesn't split it. Instead it prints a warning and exits with `3`.
rustfmt to exit with an error code if the input is not formatted correctly.
It will also print any found differences.
-(These instructions use the Syntex version of Rustfmt. If you want to use the
-nightly version replace `install rustfmt` with `install rustfmt-nightly`,
-however you must then only run this with the nightly toolchain).
+(These instructions use the nightly version of Rustfmt. If you want to use the
+Syntex version replace `install rustfmt-nightly` with `install rustfmt`).
A minimal Travis setup could look like this:
cache: cargo
before_script:
- export PATH="$PATH:$HOME/.cargo/bin"
-- which rustfmt || cargo install rustfmt
+- which rustfmt || cargo install rustfmt-nightly
script:
- cargo fmt -- --write-mode=diff
- cargo build
visual style previews, [Configurations.md](Configurations.md).
By default, Rustfmt uses a style which conforms to the [Rust style guide][style
-guide]. For details that have not yet been formalized through the [style RFC
-process][fmt rfcs], we try to adhere to a style similar to that used in the
-[Rust repo][rust].
+guide] that has been formalized through the [style RFC
+process][fmt rfcs].
-If there are styling choices you don't agree with, we are usually happy to add
-options covering different styles. File an issue, or even better, submit a PR.
+Configuration options are either stable or unstable. Stable options can always
+be used, while unstable ones are only available on a nightly toolchain, and opt-in.
+See [Configurations.md](Configurations.md) for details.
## Tips
* 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
- `rustfm --dump-default-config rustfmt.toml` and customize as needed.
+ `rustfmt --dump-default-config rustfmt.toml` and customize as needed.
* After successful compilation, a `rustfmt` executable can be found in the
target directory.
* If you're having issues compiling Rustfmt (or compile errors when trying to
* If you get an error like `error while loading shared libraries` while starting
up rustfmt you should try the following:
-On Linux:
+ On Linux:
-```
-export LD_LIBRARY_PATH=$(rustc --print sysroot)/lib:$LD_LIBRARY_PATH
-```
+ ```
+ export LD_LIBRARY_PATH=$(rustc --print sysroot)/lib:$LD_LIBRARY_PATH
+ ```
-On MacOS:
+ On MacOS:
-```
-export DYLD_LIBRARY_PATH=$(rustc --print sysroot)/lib:$DYLD_LIBRARY_PATH
-```
+ ```
+ export DYLD_LIBRARY_PATH=$(rustc --print sysroot)/lib:$DYLD_LIBRARY_PATH
+ ```
-On Windows (Git Bash/Mingw):
+ On Windows (Git Bash/Mingw):
-```
-export PATH=$(rustc --print sysroot)/lib/rustlib/x86_64-pc-windows-gnu/lib/:$PATH
-```
+ ```
+ 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).
+ (Substitute `x86_64` by `i686` and `gnu` by `msvc` depending on which version of rustc was used to install rustfmt).
## License
projects / rust.git / blobdiff