rustfmt

A tool for formatting Rust code according to style guidelines.

Gotchas

• For things you do not want rustfmt to mangle, use one of

  #[rustfmt_skip]
  #[cfg_attr(rustfmt, rustfmt_skip)]
  

• When you run rustfmt, place a file named rustfmt.toml in target file directory or its parents to override the default settings of rustfmt.
• After successful compilation, a rustfmt executable can be found in the target directory.

Installation

Note: this method currently requires you to be running a nightly install of Rust as cargo install has not yet made its way onto the stable channel.

cargo install --git https://github.com/nrc/rustfmt

or if you're using multirust

multirust run nightly cargo install --git https://github.com/nrc/rustfmt

How to build and test

First make sure you've got Rust 1.3.0 or greater available, then:

cargo build to build.

cargo test to run all tests.

cargo run -- filename to run on a file, if the file includes out of line modules, then we reformat those too. So to run on a whole module or crate, you just need to run on the top file.

You'll probably want to specify the write mode. Currently, there are the replace, overwrite, display and coverage modes. The replace mode is the default and overwrites the original files after renaming them. In overwrite mode, rustfmt does not backup the source files. To print the output to stdout, use the display mode. The write mode can be set by passing the --write-mode flag on the command line.

cargo run -- filename --write-mode=display prints the output of rustfmt to the screen, for example.