```toml
indent_style = "Block"
-reorder_imported_names = true
+reorder_imports = false
```
Each configuration option is either stable or unstable.
Stable options can be used directly, while unstable options are opt-in.
-To enable unstable options, set `unstable_features = true` in `rustfmt.toml` or pass `--unstable-options` to rustfmt.
+To enable unstable options, set `unstable_features = true` in `rustfmt.toml` or pass `--unstable-features` to rustfmt.
# Configuration Options
#### `"Block"` (default):
```rust
-if lorem_ipsum &&
- dolor_sit &&
- amet_consectetur
-{
- // ...
+fn main() {
+ if lorem_ipsum
+ && dolor_sit
+ && amet_consectetur
+ && lorem_sit
+ && dolor_consectetur
+ && amet_ipsum
+ && lorem_consectetur
+ {
+ // ...
+ }
}
```
#### `"Visual"`:
```rust
-if lorem_ipsum &&
- dolor_sit &&
- amet_consectetur {
- // ...
+fn main() {
+ if lorem_ipsum
+ && dolor_sit
+ && amet_consectetur
+ && lorem_sit
+ && dolor_consectetur
+ && amet_ipsum
+ && lorem_consectetur
+ {
+ // ...
+ }
}
```
let or = foofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoo
|| barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar;
- let sum = 123456789012345678901234567890 + 123456789012345678901234567890
+ let sum = 123456789012345678901234567890
+ + 123456789012345678901234567890
+ 123456789012345678901234567890;
let range = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
let or = foofoofoofoofoofoofoofoofoofoofoofoofoofoofoofoo ||
barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar;
- let sum = 123456789012345678901234567890 + 123456789012345678901234567890 +
+ let sum = 123456789012345678901234567890 +
+ 123456789012345678901234567890 +
123456789012345678901234567890;
let range = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa..
## `error_on_line_overflow`
-Error if unable to get all lines within `max_width`
+Error if Rustfmt is unable to get all lines within `max_width`, except for comments and string
+literals. If this happens, then it is a bug in Rustfmt. You might be able to work around the bug by
+refactoring your code to avoid long/complex expressions, usually by extracting a local variable or
+using a shorter name.
-- **Default value**: `true`
+- **Default value**: `false`
- **Possible values**: `true`, `false`
- **Stable**: No
See also [`max_width`](#max_width).
-## `error_on_line_overflow_comments`
+## `error_on_unformatted`
-Error if unable to get all comment lines within `comment_width`.
+Error if unable to get comments or string literals within `max_width`, or they are left with
+trailing whitespaces.
-- **Default value**: `true`
+- **Default value**: `false`
- **Possible values**: `true`, `false`
- **Stable**: No
-See also [`comment_width`](#comment_width).
-
## `fn_args_density`
Argument density in functions
## `where_single_line`
-To force single line where layout
+Forces the `where` clause to be laid out on a single line.
- **Default value**: `false`
- **Possible values**: `true`, `false`
```rust
use foo::{xxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzzzz};
-use foo::{aaaaaaaaaaaaaaaaaa, bbbbbbbbbbbbbbbbbb, cccccccccccccccccc, dddddddddddddddddd,
- eeeeeeeeeeeeeeeeee, ffffffffffffffffff};
+use foo::{
+ aaaaaaaaaaaaaaaaaa, bbbbbbbbbbbbbbbbbb, cccccccccccccccccc, dddddddddddddddddd,
+ eeeeeeeeeeeeeeeeee, ffffffffffffffffff,
+};
```
#### `"Horizontal"`:
```rust
use foo::{xxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzzzz};
-use foo::{aaaaaaaaaaaaaaaaaa,
- bbbbbbbbbbbbbbbbbb,
- cccccccccccccccccc,
- dddddddddddddddddd,
- eeeeeeeeeeeeeeeeee,
- ffffffffffffffffff};
+use foo::{
+ aaaaaaaaaaaaaaaaaa,
+ bbbbbbbbbbbbbbbbbb,
+ cccccccccccccccccc,
+ dddddddddddddddddd,
+ eeeeeeeeeeeeeeeeee,
+ ffffffffffffffffff,
+};
```
#### `"Vertical"`:
```rust
-use foo::{xxx,
- yyy,
- zzz};
+use foo::{
+ xxx,
+ yyy,
+ zzz,
+};
+
+use foo::{
+ aaa,
+ bbb,
+ ccc,
+ ddd,
+ eee,
+ fff,
+};
+```
+
+## `merge_imports`
+
+Merge multiple imports into a single nested import.
+
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No
+
+#### `false` (default):
+
+```rust
+use foo::{a, c, d};
+use foo::{b, g};
+use foo::{e, f};
+```
+
+#### `true`:
-use foo::{aaa,
- bbb,
- ccc,
- ddd,
- eee,
- fff};
+```rust
+use foo::{a, b, c, d, e, f, g};
```
- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: Yes
+- **Stable**: No
#### `false` (default):
fn adipiscing() -> usize {}
```
-## `reorder_imported_names`
+## `remove_nested_parens`
-Reorder lists of names in import statements alphabetically
+Remove nested parens.
-- **Default value**: `false`
+- **Default value**: `true`,
- **Possible values**: `true`, `false`
-- **Stable**: No
+- **Stable**: Yes
-#### `false` (default):
+#### `true` (default):
```rust
-use super::{lorem, ipsum, dolor, sit};
+fn main() {
+ (foo());
+}
```
-#### `true`:
-
+#### `false`:
```rust
-use super::{dolor, ipsum, lorem, sit};
+fn main() {
+ ((((foo()))));
+}
```
-See also [`reorder_imports`](#reorder_imports).
## `reorder_imports`
-Reorder import statements alphabetically
+Reorder import and extern crate statements alphabetically in groups (a group is
+separated by a newline).
-- **Default value**: `false`
+- **Default value**: `true`
- **Possible values**: `true`, `false`
-- **Stable**: No
-
-#### `false` (default):
-
-```rust
-use lorem;
-use ipsum;
-use dolor;
-use sit;
-```
+- **Stable**: Yes
-#### `true`:
+#### `true` (default):
```rust
use dolor;
use sit;
```
-See also [`reorder_imported_names`](#reorder_imported_names), [`reorder_imports_in_group`](#reorder_imports_in_group).
-
-## `reorder_imports_in_group`
-
-Reorder import statements in group
-
-- **Default value**: `false`
-- **Possible values**: `true`, `false`
-- **Stable**: No
-
-**Note:** This option takes effect only when [`reorder_imports`](#reorder_imports) is set to `true`.
-
-#### `false` (default):
+#### `false`:
```rust
-use std::mem;
-use std::io;
-
use lorem;
use ipsum;
use dolor;
use sit;
```
-#### `true`:
-```rust
-use std::io;
-use std::mem;
+## `reorder_modules`
-use dolor;
-use ipsum;
-use lorem;
-use sit;
-```
-
-See also [`reorder_imports`](#reorder_imports).
-
-## `reorder_extern_crates`
-
-Reorder `extern crate` statements alphabetically
+Reorder `mod` declarations alphabetically in group.
- **Default value**: `true`
- **Possible values**: `true`, `false`
-- **Stable**: No
+- **Stable**: Yes
-#### `true` (default):
+#### `true` (default)
```rust
-extern crate dolor;
-extern crate ipsum;
-extern crate lorem;
-extern crate sit;
+mod a;
+mod b;
+
+mod dolor;
+mod ipsum;
+mod lorem;
+mod sit;
```
-#### `false`:
+#### `false`
```rust
-extern crate lorem;
-extern crate ipsum;
-extern crate dolor;
-extern crate sit;
+mod b;
+mod a;
+
+mod lorem;
+mod ipsum;
+mod dolor;
+mod sit;
```
-See also [`reorder_extern_crates_in_group`](#reorder_extern_crates_in_group).
+**Note** `mod` with `#[macro_export]` will not be reordered since that could change the semantic
+of the original source code.
-## `reorder_extern_crates_in_group`
+## `reorder_impl_items`
-Reorder `extern crate` statements in group
+Reorder impl items. `type` and `const` are put first, then macros and methods.
-- **Default value**: `true`
+- **Default value**: `false`
- **Possible values**: `true`, `false`
- **Stable**: No
-**Note:** This option takes effect only when [`reorder_imports`](#reorder_imports) is set to `true`.
-
-#### `true` (default):
+#### `false` (default)
```rust
-extern crate a;
-extern crate b;
+struct Dummy;
+
+impl Iterator for Dummy {
+ fn next(&mut self) -> Option<Self::Item> {
+ None
+ }
-extern crate dolor;
-extern crate ipsum;
-extern crate lorem;
-extern crate sit;
+ type Item = i32;
+}
```
-#### `false`:
+#### `true`
```rust
-extern crate b;
-extern crate a;
+struct Dummy;
-extern crate lorem;
-extern crate ipsum;
-extern crate dolor;
-extern crate sit;
-```
+impl Iterator for Dummy {
+ type Item = i32;
-See also [`reorder_extern_crates`](#reorder_extern_crates).
+ fn next(&mut self) -> Option<Self::Item> {
+ None
+ }
+}
+```
## `report_todo`
}
```
-## `spaces_within_parens_and_brackets`
-
-Put spaces within non-empty generic arguments, parentheses, and square brackets
-
-- **Default value**: `false`
-- **Possible values**: `true`, `false`
-- **Stable**: No
-
-#### `false` (default):
-
-```rust
-// generic arguments
-fn lorem<T: Eq>(t: T) {
- // body
-}
-
-// non-empty parentheses
-fn lorem<T: Eq>(t: T) {
- let lorem = (ipsum, dolor);
-}
-
-// non-empty square brackets
-fn lorem<T: Eq>(t: T) {
- let lorem: [usize; 2] = [ipsum, dolor];
-}
-```
-
-#### `true`:
-
-```rust
-// generic arguments
-fn lorem< T: Eq >( t: T ) {
- // body
-}
-
-// non-empty parentheses
-fn lorem< T: Eq >( t: T ) {
- let lorem = ( ipsum, dolor );
-}
-
-// non-empty square brackets
-fn lorem< T: Eq >( t: T ) {
- let lorem: [ usize; 2 ] = [ ipsum, dolor ];
-}
-```
-
## `struct_lit_single_line`
Put small struct literals on a single line
#### `true` (default):
```rust
-let lorem = Lorem { ipsum: dolor, sit: amet };
+fn main() {
+ let lorem = Lorem { foo: bar, baz: ofo };
+}
```
#### `false`:
```rust
fn main() {
let lorem = Lorem {
- ipsum: dolor,
- sit: amet,
+ foo: bar,
+ baz: ofo,
};
}
```
fn lorem() {
let ipsum = dolor();
let sit = vec![
- "amet consectetur adipiscing elit amet consectetur adipiscing elit amet consectetur.",
+ "amet consectetur adipiscing elit amet",
+ "consectetur adipiscing elit amet consectetur.",
];
}
```
fn lorem() {
let ipsum = dolor();
let sit = vec![
- "amet consectetur adipiscing elit amet consectetur adipiscing elit amet consectetur.",
+ "amet consectetur adipiscing elit amet",
+ "consectetur adipiscing elit amet consectetur.",
];
}
```
#### `"Never"`:
```rust
-let Lorem { ipsum, dolor, sit } = amet;
-let Lorem {
- ipsum,
- dolor,
- sit,
- amet,
- consectetur,
- adipiscing
-} = elit;
+fn main() {
+ let Lorem { ipsum, dolor, sit } = amet;
+ let Lorem {
+ ipsum,
+ dolor,
+ sit,
+ amet,
+ consectetur,
+ adipiscing
+ } = elit;
+}
```
See also: [`match_block_trailing_comma`](#match_block_trailing_comma).
```rust
fn lorem<Ipsum: Dolor + Sit = Amet>() {
- // body
+ // body
}
```
```rust
fn lorem<Ipsum: Dolor+Sit=Amet>() {
- // body
+ // body
+}
+```
+
+## `use_field_init_shorthand`
+
+Use field initialize shorthand if possible.
+
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: Yes
+
+#### `false` (default):
+
+```rust
+struct Foo {
+ x: u32,
+ y: u32,
+ z: u32,
+}
+
+fn main() {
+ let x = 1;
+ let y = 2;
+ let z = 3;
+ let a = Foo { x: x, y: y, z: z };
+}
+```
+
+#### `true`:
+
+```rust
+struct Foo {
+ x: u32,
+ y: u32,
+ z: u32,
+}
+
+fn main() {
+ let x = 1;
+ let y = 2;
+ let z = 3;
+ let a = Foo { x, y, z };
}
```
- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: No
+- **Stable**: Yes
#### `false` (default):
```rust
-let lorem = try!(ipsum.map(|dolor|dolor.sit()));
+fn main() {
+ let lorem = try!(ipsum.map(|dolor| dolor.sit()));
+}
```
#### `true`:
```rust
-let lorem = ipsum.map(|dolor| dolor.sit())?;
+fn main() {
+ let lorem = ipsum.map(|dolor| dolor.sit())?;
+}
```
- **Default value**: `false`
- **Possible values**: `true`, `false`
-- **Stable**: Yes
+- **Stable**: No
#### `false` (default):
#### `true` (default):
```rust
-match lorem {
- true => {
- foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo(x)
+fn main() {
+ match lorem {
+ true => {
+ foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo(x)
+ }
+ false => println!("{}", sit),
}
- false => println!("{}", sit),
}
```
#### `false`:
```rust
-match lorem {
- true =>
- foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo(x),
- false => println!("{}", sit),
+fn main() {
+ match lorem {
+ true =>
+ foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo(x),
+ false => println!("{}", sit),
+ }
}
```
See also: [`match_block_trailing_comma`](#match_block_trailing_comma).
-## `write_mode`
-
-What Write Mode to use when none is supplied: Replace, Overwrite, Display, Diff, Coverage
-
-- **Default value**: `"Overwrite"`
-- **Possible values**: `"Checkstyle"`, `"Coverage"`, `"Diff"`, `"Display"`, `"Overwrite"`, `"Plain"`, `"Replace"`
-- **Stable**: No
## `blank_lines_upper_bound`
Original Code:
```rust
+#![rustfmt::skip]
+
fn foo() {
println!("a");
}
Original Code (rustfmt will not change it with the default value of `0`):
```rust
+#![rustfmt::skip]
+
fn foo() {
println!("a");
}
println!("c");
}
```
+
+
+## `required_version`
+
+Require a specific version of rustfmt. If you want to make sure that the
+specific version of rustfmt is used in your CI, use this option.
+
+- **Default value**: `CARGO_PKG_VERSION`
+- **Possible values**: any published version (e.g. `"0.3.8"`)
+- **Stable**: No
+
+## `hide_parse_errors`
+
+Do not show parse errors if the parser failed to parse files.
+
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No
+
+## `color`
+
+Whether to use colored output or not.
+
+- **Default value**: `"Auto"`
+- **Possible values**: "Auto", "Always", "Never"
+- **Stable**: No
+
+## `unstable_features`
+
+Enable unstable features on stable channel.
+
+- **Default value**: `false`
+- **Possible values**: `true`, `false`
+- **Stable**: No
+
+## `license_template_path`
+
+Check whether beginnings of files match a license template.
+
+- **Default value**: `""``
+- **Possible values**: path to a license template file
+- **Stable**: No
+
+A license template is a plain text file which is matched literally against the
+beginning of each source file, except for `{}`-delimited blocks, which are
+matched as regular expressions. The following license template therefore
+matches strings like `// Copyright 2017 The Rust Project Developers.`, `//
+Copyright 2018 The Rust Project Developers.`, etc.:
+
+```
+// Copyright {\d+} The Rust Project Developers.
+```
+
+`\{`, `\}` and `\\` match literal braces / backslashes.
+
+## `ignore`
+
+Skip formatting the specified files and directories.
+
+- **Default value**: format every files
+- **Possible values**: See an example below
+- **Stable**: No
+
+### Example
+
+If you want to ignore specific files, put the following to your config file:
+
+```toml
+ignore = [
+ "src/types.rs",
+ "src/foo/bar.rs",
+]
+```
+
+If you want to ignore every file under `examples/`, put the following to your config file:
+
+```toml
+ignore [
+ "examples",
+]
+```
+
+## `emit_mode`
+
+Internal option
+
+## `make_backup`
+
+Internal option, use `--backup`
projects / rust.git / blobdiff