path: root/doc/ale-rust.txt

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ALE Rust Integration                                         *ale-rust-options*
                                                         *ale-integration-rust*

===============================================================================
Integration Information

  If Vim does not detect the Rust file type out-of-the-box, you need the runtime
  files for Rust distributed in Vim >=8.0.0501 or upstream:
  https://github.com/rust-lang/rust.vim

  Note that there are several possible linters and fixers for Rust files:

  1. rustc -- The Rust compiler is used to check the currently edited file.
     So, if your project consists of multiple files, you will get some errors
     when you use e.g. a struct which is defined in another file. You can use
     |g:ale_rust_ignore_error_codes| to ignore some of these errors.
  2. cargo -- If your project is managed by Cargo, the whole project is
     checked. That means that all errors are properly shown, but cargo can
     only operate on the files written on disk, so errors will not be reported
     while you type.
  3. rls -- If you have `rls` installed, you might prefer using this linter
     over cargo. rls implements the Language Server Protocol for incremental
     compilation of Rust code, and can check Rust files while you type. `rls`
     requires Rust files to be contained in Cargo projects.
  4. analyzer -- If you have rust-analyzer installed, you might prefer using
     this linter over cargo and rls. rust-analyzer also implements the
     Language Server Protocol for incremental compilation of Rust code, and is
     the next iteration of rls. rust-analyzer either requires Rust files to be
     contained in Cargo projects or requires the project to be described in
     the rust-project.json format:
     https://rust-analyzer.github.io/manual.html#non-cargo-based-projects
  5. rustfmt -- If you have `rustfmt` installed, you can use it as a fixer to
     consistently reformat your Rust code.

  Only cargo and rls are enabled by default. To switch to using rustc instead
  of cargo, configure |g:ale_linters| appropriately: >

  " See the help text for the option for more information.
  let g:ale_linters = {'rust': ['rustc', 'rls']}
<

  Also note that rustc 1.18. or later is needed.


===============================================================================
analyzer                                                    *ale-rust-analyzer*

g:ale_rust_analyzer_executable                 *g:ale_rust_analyzer_executable*
                                               *b:ale_rust_analyzer_executable*
  Type: |String|
  Default: `'rust-analyzer'`

  This variable can be modified to change the executable path for
  `rust-analyzer`.


g:ale_rust_analyzer_config                         *g:ale_rust_analyzer_config*
                                                   *b:ale_rust_analyzer_config*
  Type: |Dictionary|
  Default: `{}`

  Dictionary with configuration settings for rust-analyzer.


===============================================================================
cargo                                                          *ale-rust-cargo*

g:ale_rust_cargo_use_check                         *g:ale_rust_cargo_use_check*
                                                   *b:ale_rust_cargo_use_check*
  Type: |Number|
  Default: `1`

  When set to `1`, this option will cause ALE to use `cargo check` instead of
  `cargo build` . `cargo check` is supported since version 1.16.0 of Rust.

  ALE will never use `cargo check` when the version of `cargo` is less than
  0.17.0.


g:ale_rust_cargo_check_all_targets         *g:ale_rust_cargo_check_all_targets*
                                           *b:ale_rust_cargo_check_all_targets*
  Type: |Number|
  Default: `0`

  When set to `1`, ALE will set the `--all-targets` option when `cargo check`
  is used. See |g:ale_rust_cargo_use_check|,


g:ale_rust_cargo_check_tests                     *g:ale_rust_cargo_check_tests*
                                                 *b:ale_rust_cargo_check_tests*
  Type: |Number|
  Default: `0`

  When set to `1`, ALE will set the `--tests` option when `cargo check`
  is used. This allows for linting of tests which are normally excluded.
  See |g:ale_rust_cargo_use_check|,


g:ale_rust_cargo_check_examples               *g:ale_rust_cargo_check_examples*
                                              *b:ale_rust_cargo_check_examples*
  Type: |Number|
  Default: `0`

  When set to `1`, ALE will set the `--examples` option when `cargo check`
  is used. This allows for linting of examples which are normally excluded.
  See |g:ale_rust_cargo_use_check|,


g:ale_rust_cargo_default_feature_behavior
                                    *g:ale_rust_cargo_default_feature_behavior*
                                    *b:ale_rust_cargo_default_feature_behavior*
  Type: |String|
  Default: `default`

  When set to `none`, ALE will set the `--no-default-features` option when
  invoking `cargo`. Only the features specified in
  |g:ale_rust_cargo_include_features| will be included when performing the
  lint check.

  When set to `default`, ALE will instruct `cargo` to build all default
  features specified in the project's `Cargo.toml` file, in addition to
  including any additional features defined in
  |g:ale_rust_cargo_include_features|.

  When set to `all`, ALE will set the `--all-features` option when
  invoking `cargo`, which will include all features defined in the project's
  `Cargo.toml` file when performing the lint check.


g:ale_rust_cargo_include_features           *g:ale_rust_cargo_include_features*
                                            *b:ale_rust_cargo_include_features*
  Type: |String|
  Default: `''`

  When defined, ALE will set the `--features` option when invoking `cargo` to
  perform the lint check. See |g:ale_rust_cargo_default_feature_behavior|.


g:ale_rust_cargo_avoid_whole_workspace *g:ale_rust_cargo_avoid_whole_workspace*
                                       *b:ale_rust_cargo_avoid_whole_workspace*
  Type: |Number|
  Default: `1`

  When set to 1, and ALE is used to edit a crate that is part of a Cargo
  workspace, avoid building the entire workspace by invoking `cargo` directly
  in the crate's directory. Otherwise, behave as usual.


g:ale_rust_cargo_use_clippy                       *g:ale_rust_cargo_use_clippy*
                                                  *b:ale_rust_cargo_use_clippy*
  Type: |Number|
  Default: `0`

  When set to 1, `cargo clippy` will be used instead of `cargo check` or
  `cargo build` as linter.
  For details of `cargo clippy`, please visit the following link:

  https://github.com/rust-lang-nursery/rust-clippy

  Since `cargo clippy` is optional toolchain, it's safer to check whether
  `cargo-clippy` is executable as follows:
>
    let g:ale_rust_cargo_use_clippy = executable('cargo-clippy')
<

g:ale_rust_cargo_clippy_options               *g:ale_rust_cargo_clippy_options*
                                              *b:ale_rust_cargo_clippy_options*

  Type: |String|
  Default: `''`

  When `cargo clippy` is used, this value will be added to a command line to run
  it. This variable is useful when you want to add some extra options which
  only `cargo clippy` supports (e.g. `--deny`).


g:ale_rust_cargo_target_dir                       *g:ale_rust_cargo_target_dir*
                                                  *b:ale_rust_cargo_target_dir*

  Type: |String|
  Default: `''`

  Use a custom target directory when running the commands for ALE. This can
  help to avoid "waiting for file lock on build directory" messages when
  running `cargo` commands manually while ALE is performing its checks.


===============================================================================
cspell                                                        *ale-rust-cspell*

See |ale-cspell-options|


===============================================================================
rls                                                              *ale-rust-rls*

g:ale_rust_rls_executable                           *g:ale_rust_rls_executable*
                                                    *b:ale_rust_rls_executable*
  Type: |String|
  Default: `'rls'`

  This variable can be modified to change the executable path for `rls`.


g:ale_rust_rls_toolchain                             *g:ale_rust_rls_toolchain*
                                                     *b:ale_rust_rls_toolchain*
  Type: |String|
  Default: `''`

  This option can be set to change the toolchain used for `rls`. Possible
  values include `'nightly'`, `'beta'`, `'stable'`, and `''`. When using
  option `''`, rls will automatically find the default toolchain set by
  rustup. If you want to use `rls` from a specific toolchain version, you may
  also use values like `'channel-yyyy-mm-dd-arch-target'` as long as
  `'rls +{toolchain_name} -V'` runs correctly in your command line.

  The `rls` server will only be started once per executable.


g:ale_rust_rls_config                                   *g:ale_rust_rls_config*
                                                        *b:ale_rust_rls_config*
  Type: |Dictionary|
  Default: `{}`

  Dictionary with configuration settings for rls. For example, to force
  using clippy as linter: >
        {
      \   'rust': {
      \     'clippy_preference': 'on'
      \   }
      \ }


===============================================================================
rustc                                                          *ale-rust-rustc*


g:ale_rust_rustc_options                             *g:ale_rust_rustc_options*
                                                     *b:ale_rust_rustc_options*
  Type: |String|
  Default: `'--emit=mir -o /dev/null'`

  The variable can be used to change the options passed to `rustc`.

  Users of nightly builds of Rust might want to use `-Z no-codegen` instead.
  Be careful when setting the options, as running `rustc` could execute code
  or generate binary files.


g:ale_rust_ignore_error_codes                   *g:ale_rust_ignore_error_codes*
                                                *b:ale_rust_ignore_error_codes*
  Type: |List| of |String|s
  Default: `[]`

  This variable can contain error codes which will be ignored. For example, to
  ignore most errors regarding failed imports, put this in your .vimrc
  >
  let g:ale_rust_ignore_error_codes = ['E0432', 'E0433']


g:ale_rust_ignore_secondary_spans           *g:ale_rust_ignore_secondary_spans*
                                            *b:ale_rust_ignore_secondary_spans*
  Type: Number
  Default: 0

  When set to 1, instructs the Rust error reporting to ignore secondary spans.
  The problem with secondary spans is that they sometimes appear in error
  messages before the main cause of the error, for example: >

  1 src/main.rs|98 col 5 error| this function takes 4 parameters but 5
    parameters were supplied: defined here
  2 src/main.rs|430 col 32 error| this function takes 4 parameters but 5
    parameters were supplied: expected 4 parameters
<
  This is due to the sorting by line numbers. With this option set to 1,
  the 'defined here' span will not be presented.


===============================================================================
rustfmt                                                      *ale-rust-rustfmt*

g:ale_rust_rustfmt_options                         *g:ale_rust_rustfmt_options*
                                                   *b:ale_rust_rustfmt_options*
  Type: |String|
  Default: `''`

  This variable can be set to pass additional options to the rustfmt fixer.


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