cargo-fix(1)

NAME

cargo-fix - Automatically fix lint warnings reported by rustc

SYNOPSIS

cargo fix [options]

DESCRIPTION

This Cargo subcommand will automatically take rustc's suggestions from diagnostics like warnings and apply them to your source code. This is intended to help automate tasks that rustc itself already knows how to tell you to fix!

Executing cargo fix will under the hood execute cargo-check(1). Any warnings applicable to your crate will be automatically fixed (if possible) and all remaining warnings will be displayed when the check process is finished. For example if you'd like to apply all fixes to the current package, you can run:

cargo fix

which behaves the same as cargo check --all-targets.

cargo fix is only capable of fixing code that is normally compiled with cargo check. If code is conditionally enabled with optional features, you will need to enable those features for that code to be analyzed:

cargo fix --features foo

Similarly, other cfg expressions like platform-specific code will need to pass --target to fix code for the given target.

cargo fix --target x86_64-pc-windows-gnu

If you encounter any problems with cargo fix or otherwise have any questions or feature requests please don't hesitate to file an issue at https://github.com/rust-lang/cargo.

Edition migration

The cargo fix subcommand can also be used to migrate a package from one edition to the next. The general procedure is:

  1. Run cargo fix --edition. Consider also using the --all-features flag if your project has multiple features. You may also want to run cargo fix --edition multiple times with different --target flags if your project has platform-specific code gated by cfg attributes.
  2. Modify Cargo.toml to set the edition field to the new edition.
  3. Run your project tests to verify that everything still works. If new warnings are issued, you may want to consider running cargo fix again (without the --edition flag) to apply any suggestions given by the compiler.

And hopefully that's it! Just keep in mind of the caveats mentioned above that cargo fix cannot update code for inactive features or cfg expressions. Also, in some rare cases the compiler is unable to automatically migrate all code to the new edition, and this may require manual changes after building with the new edition.

OPTIONS

Fix options

--broken-code
Fix code even if it already has compiler errors. This is useful if cargo fix fails to apply the changes. It will apply the changes and leave the broken code in the working directory for you to inspect and manually fix.
--edition
Apply changes that will update the code to the next edition. This will not update the edition in the Cargo.toml manifest, which must be updated manually after cargo fix --edition has finished.
--edition-idioms
Apply suggestions that will update code to the preferred style for the current edition.
--allow-no-vcs
Fix code even if a VCS was not detected.
--allow-dirty
Fix code even if the working directory has changes.
--allow-staged
Fix code even if the working directory has staged changes.

选择包

默认情况下，如果没有指定包，则根据清单文件来选择包(如果没有通过--manifest-path给出清单文件路径， 则基于当前工作目录进行寻找)。如果是某个工作区的根清单，则选中该工作区的默认成员；否则仅选中清 单所定义的那个包。

工作区的默认成员可通过清单中workspace.default-members项来显式指定。如果未指定，则其虚拟 工作区会包含全体工作区成员(等同于传递--workspace标志参数时)，而非虚拟工作区则仅包含根部箱自身。

-p spec...
--package spec...
Fix指定包. SPEC的格式参见 cargo-pkgid(1) 。 此标志参数可多次使用且支持Unix通配符(*, ? 和 [])。不过，为避免shell可能错误地在Cargo获取到 之前就将通配符展开，应在各个模式串两侧使用单引号或双引号。
--workspace
Fix 工作区中的全体成员.
--all
--workspace的已废弃的别名。
--exclude SPEC...
排除指定包。必须与--workspace标志参数共同使用。 此标志参数可多次使用且支持Unix通配符(*, ? 和 [])。不过，为避免shell可能错误地在Cargo获取到 之前就将通配符展开，应在各个模式串两侧使用单引号或双引号。

Target Selection

When no target selection options are given, cargo fix will fix all targets (--all-targets implied). Binaries are skipped if they have required-features that are missing.

Passing target selection flags will fix only the specified targets.

Note that --bin, --example, --test and --bench flags also support common Unix glob patterns like *, ? and []. However, to avoid your shell accidentally expanding glob patterns before Cargo handles them, you must use single quotes or double quotes around each glob pattern.

--lib
Fix the package's library.
--bin name...
Fix the specified binary. This flag may be specified multiple times and supports common Unix glob patterns.
--bins
Fix all binary targets.
--example name...
Fix the specified example. This flag may be specified multiple times and supports common Unix glob patterns.
--examples
Fix all example targets.
--test name...
Fix the specified integration test. This flag may be specified multiple times and supports common Unix glob patterns.
--tests
Fix all targets in test mode that have the test = true manifest flag set. By default this includes the library and binaries built as unittests, and integration tests. Be aware that this will also build any required dependencies, so the lib target may be built twice (once as a unittest, and once as a dependency for binaries, integration tests, etc.). Targets may be enabled or disabled by setting the test flag in the manifest settings for the target.
--bench name...
Fix the specified benchmark. This flag may be specified multiple times and supports common Unix glob patterns.
--benches
Fix all targets in benchmark mode that have the bench = true manifest flag set. By default this includes the library and binaries built as benchmarks, and bench targets. Be aware that this will also build any required dependencies, so the lib target may be built twice (once as a benchmark, and once as a dependency for binaries, benchmarks, etc.). Targets may be enabled or disabled by setting the bench flag in the manifest settings for the target.
--all-targets
Fix all targets. This is equivalent to specifying --lib --bins --tests --benches --examples.

特性选择

可通过传递特性参数来控制启用哪些特性。如果没有给定要使用的特性， 则每个已选择的包都会自动使用default特性。

详见the features documentation。

--features features
传递以空格或者逗号分隔的列表，其中给出要启用的特性。工作区成员的特性可通过包名/特性名的语法启用。 此参数可多次给定，以分别启用给定的特性。
--all-features
为给定的包启用全部可用特性
--no-default-features
不启用给定包的default特性

Compilation Options

--target triple
为指定架构执行 Fix 。默认情况下为本机的架构。三元组的格式为 <arch><sub>-<vendor>-<sys>-<abi>。执行 rustc --print target-list 可得到支持的构建目标列表。

也可通过build.target指定(config value)。

注意，指定该标志参数会使Cargo产生的构建工件放在与平常不同的目录下。 详情参见build cache

-r
--release
Fix optimized artifacts with the release profile. See also the --profile option for choosing a specific profile by name.
--profile name
Fix with the given profile.

As a special case, specifying the test profile will also enable checking in test mode which will enable checking tests and enable the test cfg option. See rustc tests for more detail.

See the the reference for more details on profiles.

--ignore-rust-version
Fix the target even if the selected Rust compiler is older than the required Rust version as configured in the project's rust-version field.

Output Options

--target-dir directory
用于存放生成的工件以及中间文件的目录。也可通过环境变量CARGO_TARGET_DIR 或 build.target-dir config value指定。

默认情况下为根工作区中的target目录。

Display Options

-v
--verbose
启用更加详细的输出。可两次使用来显示"非常详细"的输出，其中包含了诸如 依赖警告 以及 构建脚本输出 等额外的输出内容。 也可通过term.verbose指定。 config value.
-q
--quiet
不输出Cargo的日志信息。也可通过term.quiet指定。 config value.
--color when
控制输出内容的颜色。有效取值如下：

  • auto (默认)：自动检测终端是否支持带颜色的输出。
  • always：总显示带颜色的输出。
  • never：从不显示带颜色的输出。

也可通过term.color指定。 config value.

--message-format fmt
The output format for diagnostic messages. Can be specified multiple times and consists of comma-separated values. Valid values:

  • human (default): Display in a human-readable text format. Conflicts with short and json.
  • short: Emit shorter, human-readable text messages. Conflicts with human and json.
  • json: Emit JSON messages to stdout. See the reference for more details. Conflicts with human and short.
  • json-diagnostic-short: Ensure the rendered field of JSON messages contains the "short" rendering from rustc. Cannot be used with human or short.
  • json-diagnostic-rendered-ansi: Ensure the rendered field of JSON messages contains embedded ANSI color codes for respecting rustc's default color scheme. Cannot be used with human or short.
  • json-render-diagnostics: Instruct Cargo to not include rustc diagnostics in in JSON messages printed, but instead Cargo itself should render the JSON diagnostics coming from rustc. Cargo's own JSON diagnostics and others coming from rustc are still emitted. Cannot be used with human or short.

Manifest Options

--manifest-path path
用于指定Cargo.toml文件的路径。默认情况下，Cargo会在当前目录或上级目录中寻找Cargo.toml文件。
--frozen
--locked
这两个选项用于保证Cargo.lock文件是最新的。如果该锁文件不存在，或者不是最新的，Cargo 会报错退出。其中--frozen选项会阻止Cargo访问网络以检查锁文件是否是最新的。

这些选项，可用于保证Cargo.lock文件是最新的(比如持续集成的构建过程)， 或用于避免联网。

--offline
禁止Cargo访问网络。如果不添加此选项，Cargo在需要访问网络但网络不可用的情况下，会报错 并停止工作。添加此选项后，Cargo会尽可能尝试不使用网络来工作。

注意，在此情况下可能会产生与联网状态下不同的依赖解析(Dependency Resolution)结果。 Cargo只会使用本地已下载的crate，即便本地的索引副本中表明可能有新版本crate。在离线前下载 所需依赖的方法，参见 cargo-fetch(1) 。

也可以通过 net.offline config value指定。

Common Options

+toolchain
If Cargo has been installed with rustup, and the first argument to cargo begins with +, it will be interpreted as a rustup toolchain name (such as +stable or +nightly). See the rustup documentation for more information about how toolchain overrides work.
-h
--help
Prints help information.
-Z flag
Unstable (nightly-only) flags to Cargo. Run cargo -Z help for details.

Miscellaneous Options

-j N
--jobs N
要并行运行的作业数量。也可通过build.jobs config value指定。 默认为CPU数量。

环境

关于Cargo所读取的环境变量，可参见the reference

退出状态

  • 0: Cargo命令执行成功
  • 101: Cargo命令未能完成.

EXAMPLES

  1. Apply compiler suggestions to the local package:

    cargo fix

  2. Update a package to prepare it for the next edition:

    cargo fix --edition

  3. Apply suggested idioms for the current edition:

    cargo fix --edition-idioms

SEE ALSO

cargo(1), cargo-check(1)