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Chapter 3. rustfmt

The rustfmt tool provides automatic formatting of Rust source code.

Rust Toolset is distributed with rustfmt 1.0.0.

3.1. Installing rustfmt
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On Red Hat Enterprise Linux 7, the rustfmt tool is provided by the rust-toolset-1.31-rustfmt-preview package. To install it:

# yum install rust-toolset-1.31-rustfmt-preview

3.2. Using rustfmt as a standalone tool
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To format a rust source file and all its dependencies with the rustfmt tool:

For Red Hat Enterprise Linux 7:

$ scl enable rust-toolset-1.31 'rustfmt source-file'

For Red Hat Enterprise Linux 8:
```
$ rustfmt source-file
```

Replace source-file with path to the source file.

By default, rustfmt modifies the affected files in place without displaying details or creating backups. To change the behavior, use the --write-mode value option. For further details see the help mesage of rustfmt:

For Red Hat Enterprise Linux 7:

$ scl enable rust-toolset-1.31 'rustfmt --help'

For Red Hat Enterprise Linux 8:
```
$ rustfmt --help
```

Additionally, rustfmt accepts standard input instead of a file and provides its output in standard output.

3.3. Using rustfmt with cargo
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To format all source files in a cargo crate:

For Red Hat Enterprise Linux 7:

$ scl enable rust-toolset-1.31 'cargo fmt'

For Red Hat Enterprise Linux 8:
```
$ cargo fmt
```

To change the rustfmt formatting options, create the configuration file rustfmt.toml in the project directory and supply the configuration there. For further details see the help message of rustfmt:

For Red Hat Enterprise Linux 7:

$ scl enable rust-toolset-1.31 'rustfmt --config-help'

For Red Hat Enterprise Linux 8:
```
$ rustfmt --config-help
```

3.4. Additional Resources
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Help messages of rustfmt:

For Red Hat Enterprise Linux 7:

$ scl enable rust-toolset-1.31 'rustfmt --help'
$ scl enable rust-toolset-1.31 'rustfmt --config-help'

For Red Hat Enterprise Linux 8:

$ rustfmt --help
$ rustfmt --config-help

The file Configurations.md installed under /opt/rh/rust-toolset-1.31/root/usr/share/doc/rust-toolset-1.31-rustfmt-preview-0.8.2/Configurations.md

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